Release Notes for the Catalyst 4500 Series Switch, Release 15.0(2)SG
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Table of Contents
Release Notes for theCatalyst 4500 Series Switch, Cisco IOS Releases 15.0(2)SG
Cisco IOS Software Packaging for the Cisco Catalyst 4500 Series Switch
Feature Support on the LAN Base vs IP Base Images
Features Unique to Supervisor Engines 6-E and 6L-E
Cisco Classic IOS Release Strategy for theCatalyst 4500 Series Switch
Cisco IOS Software Migration Guide
Supported Hardware on Catalyst 4500 Series Switch
Supported Hardware on Catalyst 4500 E-Series Switch
New Hardware Features in Release15.0(2)SG1
New Software Features in Release15.0(2)SG1
New Hardware Features in Release15.0(2)SG
New Software Features in Release15.0(2)SG
Identifying an +E Chassis and ROMMON
Guidelines for Upgrading the ROMMON
Upgrading the Supervisor Engine ROMMON from the Console
Upgrading the Supervisor Engine ROMMON Remotely Using Telnet
Upgrading the Cisco IOS Software
For Supervisor Engines II+Plus through V-10GE
For Supervisor Engine 6-E and Supervisor Engine 6L-E
Resolved Caveats in Cisco IOS Release 15.0(2)SG11
Open Caveats for Cisco IOS Release 15.0(2)SG10
Resolved Caveats in Cisco IOS Release 15.0(2)SG10
Resolved Caveats for Cisco IOS Release 15.0(2)SG9
Resolved Caveats in Cisco IOS Release 15.0(2)SG8
Open Caveats for Cisco IOS Release 15.0(2)SG6
Resolved Caveats in Cisco IOS Release 15.0(2)SG6
Open Caveats for Cisco IOS Release 15.0(2)SG5
Resolved Caveats in Cisco IOS Release 15.0(2)SG5
Open Caveats for Cisco IOS Release 15.0(2)SG4
Resolved Caveats in Cisco IOS Release 15.0(2)SG4
Open Caveats for Cisco IOS Release 15.0(2)SG3
Resolved Caveats in Cisco IOS Release 15.0(2)SG3
Open Caveats for Cisco IOS Release 15.0(2)SG2
Resolved Caveats in Cisco IOS Release 15.0(2)SG2
Open Caveats for Cisco IOS Release 15.0(2)SG1
Resolved Caveats in Cisco IOS Release 15.0(2)SG1
Open Caveats for Cisco IOS Release 15.0(2)SG
Resolved Caveats in Cisco IOS Release 15.0(2)SG
Troubleshooting at the System Level
Obtaining Documentation and Submitting a Service Request
Release Notes for theCatalyst 4500 Series Switch, Cisco IOS Releases 15.0(2)SG
Current Release
15.0(2)SG11—October 18, 2016
Prior Release
15.0(2)SG10, 15.0(2)SG9, 15.0(2)SG8, 15.0(2)SG6, 15.0(2)SG5, 15.0(2)SG4, 15.0(2)SG3, 15.0(2)SG2, 15.0(2)SG1, 15.0(2)SG
These release notes describe the features, modifications, and caveats for Cisco IOS Release 15.0(2)SG on the Catalyst 4500 series switch.
Support for Cisco IOS Software Release 15.0(2)SG, the default image, follows the standard Cisco Systems® support policy, available at
http://www.cisco.com/en/US/products/products_end-of-life_policy.html
Note
Although their Release Notes are unique, the 4 platforms (Catalyst 4500, Catalyst 4900,
Catalyst ME 4900, and Catalyst 4900M/4948E) use the same Software Configuration Guide, Command Reference Guide, and System Message Guide.
For more information on the Catalyst 4500 series switches, visit the following URL:
http://www.cisco.com/go/cat4500/docs
Contents
This publication consists of these sections:
- Cisco IOS Software Packaging for the Cisco Catalyst 4500 Series Switch
- Cisco Classic IOS Release Strategy for the Catalyst 4500 Series Switch
- System Requirements
- New and Changed Information
- Upgrading the System Software
- Limitations and Restrictions
- Caveats
- Troubleshooting
- Related Documentation
- Notices
- Obtaining Documentation and Submitting a Service Request
Cisco IOS Software Packaging for the Cisco Catalyst 4500 Series Switch
The Enterprise Services image supports all Cisco Catalyst 4500 Series software features based on Cisco IOS Software, including enhanced routing. Customers planning to enable BGP for Supervisor Engine IV, V, or V-10GE will no longer need to purchase a separate BGP license (FR-IRC4) because BGP is included in the Enterprise Services package. Beginning with 12.2(53)SG2, we support the Enterprise Services image on Supervisor Engine 6L-E.
The IP Base image supports Open Shortest Path First (OSPF) for Routed Access and Enhanced Interior Gateway Routing Protocol (EIGRP) "limited" Stub Routing, and RIPv1/v2. The IP Base image does not support enhanced routing features such as Nonstop Forwarding/Stateful Switchover (NSF/SSO), BGP, Intermediate System-to-Intermediate System (IS-IS), Internetwork Packet Exchange (IPX), AppleTalk, Virtual Routing Forwarding (VRF-lite), GLBP, and policy-based routing (PBR).
Cisco IOS Release 12.2(46)SG1 introduced a new LAN Base software and an IP upgrade image. These complement the existing IP Base and Enterprise Services images. The LAN base image is supported on the Supervisor Engine II-Plus-10GE and Supervisor Engine 6L-E starting with Cisco IOS Release 12.2(52)XO. LAN Base image is primarily focused on customer access and Layer 2 requirements and therefore many of the IP Base features are not required. The IP upgrade image is available if at a later date you require some of those features.
Starting with Cisco IOS Release 15.0(2)SG, on the Catalyst 4500 Series Switch, support for NEAT feature has been extended from IP Base to LAN Base and support for HSRP v2 IPV6 has been extended from Enterprise Services to IP Base.
- Feature Support on the LAN Base vs IP Base Images
- Features Unique to Supervisor Engines 6-E and 6L-E
- Unsupported Features
- Orderable Product Numbers
Feature Support on the LAN Base vs IP Base Images
Table 1 is a detailed list of features supported on Catalyst 4500 Series Switch running Cisco IOS Software Release 15.0(2)SG. For the full list of supported features, check the Feature Navigator application:
http://tools.cisco.com/ITDIT/CFN/
For information on MiBs support, please refer to this URL:
http://ftp.cisco.com/pub/mibs/supportlists/cat4000/cat4000-supportlist.html
Crashdump Enhancement1 |
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Ethernet Management Port (Fa1 interface)2 |
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IEEE 802.1ag D8.1 standard Compliant CFM, Y.1731 multicast LBM / AIS / RDI / LCK, IP SLA for Ethernet |
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IEEE 802.1s - Multiple Spanning Tree (MST) Standard Compliance |
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IEEE 802.3ad Link Aggregation (LACP) Port-Channel Standalone Disable |
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IPv6 Multicast: Multicast Listener Discovery (MLD) Protocol, Versions 1 and 2 |
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NEAT Enhancement: Re-Enabling BPDU Guard Based on User Configuration |
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Yes3 |
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Yes4 |
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Yes5 |
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Yes6 |
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Yes7 |
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Yes8 |
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Yes9 |
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Yes10 |
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Yes11 |
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Yes12 |
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Yes13 |
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Yes14 |
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RADIUS Attribute 44 (Accounting Session ID) in Access Requests |
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Source Specific Multicast (SSM) - IGMPv3,IGMP v3lite, and URD |
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Note You can purchase a special license to enable the 10 Gigabit uplinks in the LAN Base image without moving to IP Base.
Features Unique to Supervisor Engines 6-E and 6L-E
With Cisco IOS Release 15.0(2)SG, the following features are available only with
Supervisor Engine 6-E and Supervisor Engine 6L-E:
– IPv6 Addressing Architecture
– DNS resolver for AAAA over an IPv4 transport
– DNS resolver for AAAA over an IPv6 transport
– ISATAP (supported in software only)
– MLD Snooping (supported in software and hardware on Catalyst 4900M, Catalyst 4948E, Supervisor Engine 6-E, and Catalyst 6L-E)
– Two Rate three Color Policing
– Table map support for marking
– Class based queuing actions (shaping/bandwidth/queue-limit/dbl/strict priority)
Unsupported Features
For all Supervisor Engines (II-Plus thru 6-E), the following features are not supported in Cisco IOS Release 15.0(2)SG for the Catalyst 4500 series switches:
– Standard Xerox Network System (XNS) access list
– Protocol type-code access list
- ADSL and Dial access for IPv6
- AppleTalk EIGRP (use native AppleTalk routing instead)
- Bridge groups
- CEF Accounting
- Cisco IOS software IPX ACLs:
– <1200-1299> IPX summary address access list
- Cisco IOS software-based transparent bridging (also called “fallback bridging”)
- Connectionless (CLNS) routing; including IS-IS routing for CLNS. IS-IS is supported for IP routing only.
- DLSw (data-link switching)
- IGRP (use EIGRP instead)
- isis network point-to-point command
- Kerberos support for access control
- LLDP HA
- Lock and key
- NAT-PT for IPv6
- Netflow per-VRF
- PBR with Multiple Tracking Options
- QoS for IPv6 traffic (only supported on Supervisor 6)
- Reflexive ACLs
- Routing IPv6 over an MPLS network
- WCCP version 1
- CFM CoS
- PBR with EOT
Orderable Product Numbers
Cisco Classic IOS Release Strategy for the
Catalyst 4500 Series Switch
Cisco IOS Release 15.0SG train offers the latest features for the Catalyst 4500 Series supervisor engines. If you need the latest hardware support and software features you should migrate to Cisco IOS Release 15.0(2)SG.
Catalyst 4500 Series has two maintenance trains. Cisco IOS Release 12.2(53)SG4 is the recommended release for customers who require a release with a maintenance train. This release includes support for the WS-X45-Sup6L-E supervisor engine and OSPF for routed Access. Cisco IOS Release 15.0(2)SG is the latest maintenance train base.
For more information on the Catalyst 4500 series switches, visit the following URL:
http://www.cisco.com/go/cat4500/docs
Cisco IOS Software Migration Guide
Figure 1 displays the two active trains, 12.2(53)SG and 15.0(2)SG.
Figure 1 Software Release Strategy for the Catalyst 4500 Series Switch
Support
Support for Cisco IOS Software Release 15.0(2)SG follows the standard Cisco Systems® support policy, available at
http://www.cisco.com/en/US/products/products_end-of-life_policy.html
System Requirements
This section describes the system requirements:
- Supported Hardware on Catalyst 4500 Series Switch
- Supported Hardware on Catalyst 4500 E-Series Switch
- Features Unique to Supervisor Engines 6-E and 6L-E
- Unsupported Features
Supported Hardware on Catalyst 4500 Series Switch
Table 3 lists the hardware supported on the Catalyst 4500 Series Switch.
For Catalyst 4500 transciever module compatibility information, see the URL:
http://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.html
Table 4 briefly describes the four chassis in the Catalyst 4500 Series Switch. For the chassis listed in the table, refer to Table 7 for software release information.
Supported Hardware on Catalyst 4500 E-Series Switch
In addition to the classic line cards and supervisor engines, Cisco IOS Software Release 15.0(2)SG supports the next-generation high-performance E-Series Supervisor Engine 6-E with CenterFlex technology and E-Series line cards and chassis. A brief list of primary E-Series hardware supported on Catalyst 4500 series switch ( Table 6 ).
Table 7 outlines the chassis and supervisor engine compatibility.
(M=Minimum release, R=Recommended release)
New and Changed Information
These sections describe the new and changed information for the Catalyst 4500 series switch running Cisco IOS software:
- New Hardware Features in Release 15.0(2)SG1
- New Software Features in Release 15.0(2)SG1
- New Hardware Features in Release 15.0(2)SG
- New Software Features in Release 15.0(2)SG
New Hardware Features in Release 15.0(2)SG1
Release 15.0(2)SG1 provides no new hardware on the Catalyst 4500 series switch.
New Software Features in Release 15.0(2)SG1
Release 15.0(2)SG1 provides the following new software feature on the Catalyst 4500 series switch.
New Hardware Features in Release 15.0(2)SG
Release 15.0(2)SG provides the following new hardware on the Catalyst 4500 series switch:
– DWDM-SFP-6141= (Cisco 1000BASE-DWDM SFP 1561.42 nm)
– DWDM-SFP-5736= (Cisco 1000BASE-DWDM SFP 1557.36 nm)
– DWDM-SFP-5332= (Cisco 1000BASE-DWDM SFP 1553.33 nm)
– DWDM-SFP-4931= (Cisco 1000BASE-DWDM SFP 1549.32 nm)
– DWDM-SFP-4532= (Cisco 1000BASE-DWDM SFP 1545.32 nm)
– DWDM-SFP-4134= (Cisco 1000BASE-DWDM SFP 1541.35 nm)
New Software Features in Release 15.0(2)SG
Release 15.0(2)SG provides the following new software features on the Catalyst 4500 series switch.
- 2-way Community Private VLANs ("Configuring Private VLANs" chapter)
- Call Home message using dedicated interface (“Configuring Call Home” chapter)
- CPU Optimization for Layer 3 Multicast Control Packets (“Configuring Network Security with ACLs” chapter)
- Duplication Location Reporting Issue
For information on the reporting issue, refer to the following URL:
http://www.cisco.com/en/US/docs/ios/ netmgmt/configuration/guide/nm_cdp_discover.html
- IEEE 802.1ag - D8.1 standard Compliant CFM, Y.1731 multicast LBM / AIS / RDI / LCK, IP SLA for Ethernet (“Configuring Ethernet OAM and CFM” chapter)
- IEEE 802.1x Critical Authorization for Voice and Data (“Configuring 802.1X Port-Based Authentication 802.1X” chapter)
- Multi-authentication and VLAN Assignment (“Configuring 802.1X Port-Based Authentication
- NEAT Enhancement: Re-Enabling BPDU Guard Based on User Configuration (“Configuring 802.1X Port-Based Authentication” chapter).
- Propagation of Location Info over CDP
For information on configuring CDP Location TLV, refer to the following URL:
http://www.cisco.com/en/US/docs/ios/ netmgmt/configuration/guide/nm_cdp_discover.html
Upgrading the System Software
In most cases, upgrading the switch to a newer release of Cisco IOS software does not require a ROMMON upgrade. However, if you are running an early release of Cisco IOS software and plan to upgrade, refer to the following tables for the minimum Cisco IOS image and the recommended ROMMON release, respectively.
Note You must upgrade to at leaset ROMMON Release 12.2(44r)SG5 to run Cisco IOS Release 15.0(2)SG on the Supervisor Engine 6-E and Supervisor Engine 6L-E. 12.2(44r)SG9 is recommended.
Most supervisor engines have the required ROMMON release. However, due to caveat CSCed25996, we recommend that you upgrade your ROMMON to the recommended release.
The following sections describe how to upgrade your switch software:
- Identifying an +E Chassis and ROMMON
- Guidelines for Upgrading the ROMMON
- Upgrading the Supervisor Engine ROMMON from the Console
- Upgrading the Supervisor Engine ROMMON Remotely Using Telnet
- Upgrading the Cisco IOS Software
Identifying an +E Chassis and ROMMON
An +E chassis is identified by a FRU minor value in the chassis' idprom.
When supervisor engine 1 (sup1) is in ROMMON and supervisor engine 2 (sup2) is in IOS, only sup2 can read the idprom contents of chassis’ idprom. Chassis type is displayed as “+E” in the output of the show version command. Conversely, sup1 can only display the chassis type as “E.”
When both sup1 and sup2 are in ROMMON, both engines can read the chassis’ idprom. Chassis type is displayed correctly as “+E” in the output of the show version command.
When both sup1 and sup2 are in IOS, both engines can read the chassis’ idprom. Chassis type is displayed correctly as “+E” in the output of the show version command.
Guidelines for Upgrading the ROMMON
If your supervisor engine is shipped with a newer version of ROMMON then do not downgrade! The new ROMMON will have board settings based on a hardware revision of components, and old settings will not work.
Upgrading ROMMON on Supervisor Engine 6-E and 6L-E may reset their uplink interfaces. Software prior to Cisco IOS Release 15.0(2)SG did not detect and recover from this situation when the standby supervisor engine ROMMON is upgraded. The redundant supervisor engine ROMMON upgrade process described next only works when the active supervisor engine is running Cisco IOS Release 15.0(2)SG. For redundant systems, you first upgrade the software to Cisco IOS Release 15.0(2)SG, then upgrade the ROMMON.
Upgrading the Supervisor Engine ROMMON from the Console
To avoid actions that might make your system unable to boot, read this entire section before starting the upgrade.
Note The examples in this section use the programmable read-only memory (PROM) upgrade version 12.2(44r)SG9 and Cisco IOS Release 12.2(50)SG. For other software releases, replace the ROMMON release and Cisco IOS software release with the appropriate release and filename. This document describes the procedure for a single supervisor engine system. In a dual supervisor engine system, you must perform the process on each supervisor engine.
Follow this procedure to upgrade your supervisor engine ROMMON:
Step 1 Directly connect a serial cable to the console port of the supervisor engine.
Note This section assumes that the console baud rate is set to 9600 (default). If you want to use a different baud rate, change the configuration register value for your switch.
Step 2 Download the cat4500-e-ios-promupgrade-122_44r_SG9 program from Cisco.com, and place it on a TFTP server in a directory that is accessible from the switch to be upgraded.
The cat4500-e-ios-promupgrade-122_44r_SG9 program is available on Cisco.com at the same location from which Catalyst 4500 system images are downloaded.
Step 3 Use the dir bootflash: command to ensure that sufficient space exists in Flash memory to store the PROM upgrade image. If you are using a CompactFlash card, replace bootflash: with slot0:
Note Because of CSCsu36751, you should use bootflash for this upgrade if your current ROMMON version is prior to 12.2(44r)SG3. Else, you might need to reseat the compact flash after rebooting.
Step 4 Download the cat4500-e-ios-promupgrade-122_44r_SG9 program into Flash memory using the copy tftp command.
The following example shows how to download the PROM upgrade image cat4500-e-ios-promupgrade-122_44r_SG9 from the remote host 172.20.58.78 to bootflash:
Address or name of remote host [172.20.58.78]?
Source filename [cat4500-e-ios-promupgrade-122_44r_SG9]?
Destination filename [cat4500-e-ios-promupgrade-122_44r_SG9]?
Accessing tftp://172.20.58.78/cat4500-e-ios-promupgrade-122_44r_SG9...
Loading cat4500-e-ios-promupgrade-122_44r_SG9 from 172.20.58.78 (via
Step 5 On a dual-supervisor system, copy the same ROMMON image to the standby supervisor engine with the copy bootflash:cat4500-e-ios-promupgrade-122_44r_SG9 slavebootflash command
Step 6 Enter the reload command to reset the switch, press Ctrl-C to stop the boot process, and re-enter ROMMON.
Note On a redundant system, this action causes a switchover.
The following example shows the output after a reset into ROMMON:
Step 7 Run the PROM upgrade program by entering this command:
boot bootflash:cat4500-e-ios-promupgrade-122_44r_SG9
No intervention is necessary to complete the upgrade. To ensure a successful upgrade, do not interrupt the process. Do not perform a reset, power cycle, or OIR of the supervisor engine until the upgrade completes.
The following example shows the output from a successful upgrade, followed by a system reset:
Step 8 Boot the Cisco IOS software image. This may happen automatically if the system is configured to auto-boot.
Step 9 On a redundant system, hook up a console to the now-active supervisor engine. After the system achieves an SSO state, repeat steps 6-8.
Step 10 Use the show module command to verify that you have upgraded the ROMMON:
Step 11 Use the delete command on the active supervisor to delete the PROM upgrade program from bootflash
The following example shows how to delete the cat4500-e-ios-promupgrade-122_44r_SG9 image from bootflash:
Step 12 On a redundant system, also delete the upgrade file from the standby supervisor engine:
The ROMMON has now been upgraded.
See the “Upgrading the Cisco IOS Software” section for instructions on how to upgrade the Cisco IOS software on your switch.
Upgrading the Supervisor Engine ROMMON Remotely Using Telnet
To avoid actions that might make your system unable to boot, read this entire section before starting the upgrade.
Follow this procedure to upgrade your supervisor engine ROMMON to Release 12.2(44r)SG9. This procedure can be used when console access is not available and when the ROMMON upgrade must be performed remotely.
Note In the following section, use the PROM upgrade version bootflash:cat4500-e-ios-promupgrade-122_44r_SG9.
Step 1 Establish a Telnet session to the supervisor engine.
Note In the following discussion, we assume that at least one IP address has been assigned to either an SVI or a routed port.
Step 2 Download the bootflash:cat4500-e-ios-promupgrade-122_44r_SG9 program from Cisco.com, and place it on a TFTP server in a directory that is accessible from the switch to be upgraded.
The bootflash:cat4500-e-ios-promupgrade-122_44r_SG9 programs are available on Cisco.com at the same location from which you download Catalyst 4500 system images.
Step 3 Use the dir bootflash: command to ensure that there is sufficient space in Flash memory to store the PROM upgrade image. If there is insufficient space, delete one or more images, and then enter the
squeeze bootflash: command to reclaim the space.
If you are using a CompactFlash card, replace bootflash: with slot0:.
Step 4 Download the bootflash:cat4500-e-ios-promupgrade-122_44r_SG9 program into Flash memory using the copy tftp command.
The following example shows how to download the PROM upgrade image bootflash:cat4500-e-ios-promupgrade-122_44r_SG9 from the remote host 172.20.58.78 to bootflash:
Step 5 Use the no boot system flash bootflash: file_name command to clear all BOOT variable commands in the configuration file. In this example, the BOOT variable was set to boot the image cat4000-i5s-mz.121-19.EW1.bin from bootflash:
Note The config-register must be set to autoboot.
Step 6 Use the show bootvar command to verify the boot string. The BOOT variable in this example will first run the PROM upgrade to upgrade ROMMON. Then, the upgrade software will reload and the supervisor engine will load the Cisco IOS software image.
Step 7 Run the PROM upgrade program by issuing the reload command. Issuing this command will terminate your Telnet session.
Verify the boot string in step 6. No intervention is necessary to complete the upgrade. To ensure a successful upgrade, do not interrupt the upgrade process. Do not perform a reset, power cycle, or OIR of the supervisor engine until the upgrade is complete.
The following example shows the console port output from a successful ROMMON upgrade followed by a system reset. Your Telnet session is disconnected during the ROMMON upgrade, so you will not see this output. This step could take 2-3 minutes to complete. You will need to reconnect your Telnet session after 2-3 minutes when the Cisco IOS software image and the interfaces are loaded.
Step 8 Use the no boot system flash bootflash: file_name command to clear the BOOT command used to upgrade the ROMMON.
Step 9 Use the show version command to verify that the ROMMON has been upgraded.
Step 10 Use the delete command to delete the PROM upgrade program from bootflash and the squeeze command to reclaim unused space.
The following example shows how to delete the cat4000-ios-promupgrade-121_20r_EW1 image from bootflash and reclaim unused space:
Step 11 Use the show bootvar command to verify that the ROMMON upgrade program has been removed from the BOOT variable.
The ROMMON has now been upgraded.
See the “Upgrading the Cisco IOS Software” section for instructions on how to upgrade the Cisco IOS software on your switch.
Upgrading the Cisco IOS Software
To avoid actions that might make your system unable to boot, please read this entire section before starting the upgrade.
Before you proceed, observe the following rules for hostname:
Uppercase and lowercase characters look the same to many internet software applications. It may seem appropriate to capitalize a name the same way you might do in English, but conventions dictate that computer names appear all lowercase. For more information, refer to RFC 1178, Choosing a Name for Your Computer.
- Must start with a letter and end with a letter or digit.
- Interior characters can only be letters, digits, and hyphens; periods and underscores not allowed.
- Names must be 63 characters or fewer; hostname of fewer than 10 characters is recommended.
- On most systems, a field of 30 characters is used for the host name and the prompt in the CLI. Longer configuration mode prompts may be truncated.
To upgrade the Cisco IOS software on your Catalyst 4500 series switch, use this procedure:
Step 1 Download Cisco IOS Release 15.01(2) from Cisco.com, and place the image on a TFTP server in a directory that is accessible from the supervisor engine that is upgraded.
Step 2 Use the dir bootflash: command to ensure that there is sufficient space in Flash memory to store the promupgrade image. If there is insufficient space, delete one or more images, and then enter the squeeze bootflash: command to reclaim the space.
If you are using a CompactFlash card, use slot0: instead of bootflash.
Step 3 Download the software image into Flash memory using the copy tftp command.
The following example shows how to download the Cisco IOS software image cat4000-is-mz.121-12c.EW from the remote host 172.20.58.78 to bootflash:
Step 4 Use the no boot system flash bootflash: file_name command to clear the cat4000-is-mz.121-8a.EW file and to save the BOOT variable.
The following example shows how to clear the BOOT variable:
Step 5 Use the boot system flash command to add the Cisco IOS software image to the BOOT variable.
The following example shows how to add the cat4000-is-mz.121-12c.EW image to the BOOT variable:
Step 6 Use the config-register command to set the configuration register to 0x2102.
The following example show how to set the second least significant bit in the configuration register:
Step 7 Enter the reload command to reset the switch and load the software.
Caution No intervention is necessary to complete the upgrade. To ensure a successful upgrade, do not interrupt the upgrade process by performing a reset, power cycle, or OIR of the supervisor, for at least five minutes.
The following example shows the output from a successful upgrade followed by a system reset:
Step 8 Use the show version command to verify that the new Cisco IOS release is operating on the switch.
Limitations and Restrictions
These sections list the limitations and restrictions for the current release of Cisco IOS software on the Catalyst 4500 series switch.
All Supervisor Engines
- When you enter the permit any any ? command you will observe the octal option, which is unsupported in Cisco IOS Release 12.2(54)SG.
- A Span destination of fa1 is not supported.
- The "keepalive" CLI is not supported in interface mode on the switch, although it will appear in the running configuration. This behavious has no impact on functionality.
- TDR is only supported on interfaces Gi1/1 through Gi1/48, at 1000BaseT under open or shorted cable conditions. TDR length resolution is +/- 10 m. If the cable is less than 10 m or if the cable is properly terminated, the TDR result displays "0" m. If the interface speed is not 1000BaseT, an "unsupported" result status displays. TDR results will be unreliable for cables extended with the use of jack panels or patch panels.
- The following guidelines apply to Fast UDLD:
– Fast UDLD is disabled by default.
– Configure fast UDLD only on point-to-point links between network devices that support fast UDLD.
– You can configure fast UDLD in either normal or aggressive mode.
– Do not enter the link debounce command on fast UDLD ports.
– Configure fast UDLD on at least two links between each connected network device. This reduces the likelihood of fast UDLD incorrectly error disabling a link due to false positives.
– Fast UDLD does not report a unidirectional link if the same error occurs simultaneously on more than one link to the same neighbor device.
The outputs of certain commands, such as show ip route and show access-lists, contain non-deterministic text. While the output is easily understood, the output text does not contain strings that are consistently output. A general purpose specification file entry is unable to parse all possible output.
While a general purpose specification file entry may not be possible, a specification file entry might be created that returns the desired text by searching for text that is guaranteed to be in the output. If a string is guaranteed to be in the output, it can be used for parsing.
For example, the output of the show ip access-lists SecWiz_Gi3_17_out_ip command is this:
The first line is easily parsed because access list is guaranteed to be in the output:
The remaining lines all contain the term host. As a result, the specification file may report the desired values by specifying that string. For example, this line
will produce the following for the first and second rules
and the following for the third statement
Request the output of the show running-config command using NETCONF and parse that output for the desired strings. This is useful when the desired lines contain nothing in common. For example, the rules in this access list do not contain a common string and the order (three permits, then a deny, then another permit), prevent the spec file entry from using permit as a search string, as in the following example:
The XML output of show running-config command includes the following, which can then be parsed programmatically, as desired:
- Although the Catalyst 4500 series switch still supports legacy 802.1X commands used in Cisco IOS Release 12.2(46)SG and earlier releases (that is, they are accepted on the CLI), they do not display in the CLI help menu.
- Current IOS software cannot support filenames exceeding 64 characters.
- All software releases support a maximum of 32,768 IGMP snooping group entries.
- After upgrading to 12.2(31)SG and later releases, some CPU queues configured as SPAN sources and saved in the startup configuration file do not function as they did in the older software release. The following table reflects this change.
This only affects a switch that has any of the following queues configured as SPAN source in releases prior to 12.2(31)SG and saved to the startup configuration. The SPAN destination would not get the same traffic after upgrading to 12.2(31)SG.
Workaround: After upgrading to 12.2(31)SG and later releases, remove the old SPAN source configuration and reconfigure with the new queue names/IDs. For example:
- Although you can configure subsecond PIM query intervals on Catalyst 4500 platforms, such an action represents a compromise between convergence (reaction time) and a number of other factors (number of mroutes, base line of CPU utilization, CPU speed, processing overhead per 1 m-route, etc.). You must account for those factors when configuring subsecond PIM timers. We recommend that you set the PIM query interval to a minimum of 2 seconds. By adjusting the available parameters, you can achieve flawless operation; that is, a top number of multicast routes per given convergence time on a specific setup.
- With Cisco IOS Release XE 3.2.1SG, memory configuration is enabled:
This configuration had been removed erroneously in a prior release.
provided the following conditions apply:
– A switchport is configured with the following:
authentication event server dead action authorize...
authenticaton event server alive action reinitalize
– The RADIUS server was down previously, and a port without traffic (for example, a hub with no devices attached) was authorized into the inaccessible authentication bypass (IAB) VLAN without an associated MAC address.
The RADIUS server becomes available again, and the IAB-authorized port transitions to another state.
For Supervisor Engines II+Plus through V-10GE
– Unnumbered interface and numbered interface in different VRFs
– GRE encapsulation forwarding method
– Hash bucket based assignment method
– Redirection on an egress interface (redirection out)
– NHRP (Next Hop Resolution Protocol)
– AppleTalk Control Protocol for PPP
– Netflow will not account for control packets, packets that encountered link-level errors, and ARP/RARP packets.
– The software cache for Netflow is fixed, users cannot change the size.
– The statistical distribution row that displays the distribution across various packet sizes is not available.
– Packet length-based matching policies are not supported.
– IP Precedence, TOS and Qos groups are fixed.
– ACL/Route-map statistics are not updated.
- IGRP is not supported (use EIGRP instead).
- The MAC address table is cleared when you switch between supervisor engines if either the 802.1s or 802.1w Spanning Tree Protocol is configured. To minimize address clearing and subsequent packet flooding, configure the edge ports as spanning-tree portfast and the link type as
spanning-tree link-type point-to-point. - While running NSF and IS-IS IETF mode, if you enter the issu runversion command within 5 minutes of entering the issu loadversion command, packet loss may occur during an ISSU upgrade.
Workaround: Configure the NSF interval timer to 0 minutes, or delay entering the issu runversion command until the NSF interval timer expires and NSF restarts.
- Routes may not be properly redistributed from one routing protocol to another when NSF is enabled on the switch. The success of the redistribution depends on the order in which the routing protocols converge after an NSF switchover.
- IP classful routing is not supported; do not use the no ip classless command; it will have no effect because only classless routing is supported. The ip classless command is not supported because classless routing is enabled by default.
- The Catalyst 4510R switch does not support Supervisor Engines II-Plus, III, IV, and II-Plus-10GE. Installing an unsupported supervisor engine causes unpredictable hardware behavior that cannot be controlled by the software. Using an unsupported supervisor engine in a redundant slot might cause a supported supervisor engine in the other slot to malfunction.
- Supervisor Engine II-Plus cannot read a CompactFlash card formatted by Supervisor Engine III or Supervisor Engine IV in a prior release.
- Catalyst 4500 supervisor engines will not be properly initialized if the VLAN configuration in the startup file does not match the information stored in the VLAN database file. This situation might occur if a backup configuration file was used.
- A Layer 2 LACP channel cannot be configured with the spanning tree PortFast feature.
- Netbooting using a boot loader image is not supported. See the “Troubleshooting” section for alternatives.
- You cannot downgrade to Cisco IOS Release 12.1(8a)EW1 after running Release 12.1(13)EW (or higher). If you need to downgrade, contact your TAC representative for further instructions, and mention caveat CSCdz59058.
- Observe the following standard Cisco IOS software behavior when deploying redundant supervisor engines in a Catalyst 4507R chassis: While the startup configuration file is being parsed, the configuration file is not applied to hardware that does not exist.
For example, if the active supervisor engine is in slot 1, and you have configured interface Gi1/1, the supervisor engine in slot 2 becomes active if you remove the active supervisor engine from the chassis. In addition, while the startup configuration file is being parsed, you will receive an error message indicating that interface Gi1/1 is no longer present. This behavior is correct. When the formerly active supervisor engine is reinserted into slot 1, there is no configuration for interface Gi1/1.
This situation does not occur when both supervisor engines are present in the chassis.
Workaround: Copy the startup configuration file into the running configuration:
- An unsupported default CLI for mobile IP is displayed in the HSRP configuration. Although this CLI will not damage your system, you might want to remove it to avoid confusion.
Workaround: Display the configuration with the show standby command, then remove the CLI. Here is an example of the show standby GigabitEthernet1/1 command output:
- For HSRP preempt delay to function consistently, you must use the standby delay minimum command. Be sure to set the delay to more than 1 hello interval, which ensures that a hello is received before HSRP leaves the initiate state.
Use the standby delay reload option if the router is rebooting after reloading the image.
- When you attempt to run OSPF between a Cisco router and a third-party router, the two interfaces might get stuck in the Exstart/Exchange state. This problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces do not match. If the router with the higher MTU sends a packet larger than the MTU set on the neighboring router, the neighboring router ignores the packet.
Workaround: Because the problem is caused by mismatched MTUs, you should change the MTU on either router to match the other’s MTU.
- You can run.1q-in-.1q packet passthrough with a Supervisor Engine III and a Supervisor Engine IV, but you can run only.1q-in-.1q encapsulation with a Supervisor Engine II+10GE, Supervisor Engine V, and Supervisor Engine V-10GE.
- For PVST and Catalyst 4500 E-Series switch VLAN, Cisco IOS Release 12.1(13)EW supports a maximum of 3000 spanning tree port instances. If you want to use more instances, use MST rather than PVST.
- Only ports 1 and 2 on the WS-X4418-GB module and ports 13 and 14 on the WS-X4412-2GB-T module can be set as ISL trunks.
- If an original packet is dropped due to transmit queue shaping or sharing configurations, a SPAN packet copy can still be transmitted on the SPAN port.
- For all software releases, do not use over 100,000 routes.
- Use the no ip unreachables command on all interfaces with ACLs configured for performance reasons.
- Layer 3 path load-balancing metrics are not supported in Cisco IOS Releases 12.1(8a)EW, 12.1(11b)EW, 12.1(12c)EW, 12.1(13)EW, 12.1(19)EW, and 12.1(20)EW. (CSCdv10578)
- The threshold for the Dynamic ARP Inspection err-disable function is set to 15 ARP packets per second per interface. You should adjust this threshold depending on the network configuration. The CPU should not receive DHCP packets at a sustained rate greater than 1000 pps.
- A limited number of ACL bindings are dynamically installed by the IP source guard feature on a Catalyst 4500 series switch Supervisor Engine II-Plus. To take full advantage of the IP source guard feature, you should use Supervisor Engine IV.
- If you first configure an IP address or IPv6 address on a Layer 3 port, then change the Layer 3 port to a Layer 2 port with the switchport command, and finally change it back to a Layer 3 port, the original IP/IPv6 address is lost.
- By default, IPv6 is not enabled. To route IPv6, you must enter the IPv6 unicast-routing command. If you plan to use IPv6 multicast routing, use the IPv6 multicast-routing command.
- By default, CEF is not enabled for IPv6 (after IPv6 unicast routing is enabled). To prevent IPv6 traffic from being process-switched, use the IPv6 cef command.
- Multicast sources in community VLANs are not supported.
- Two-way community VLANs are not supported.
- Voice VLANs are not supported on community VLAN host interfaces.
- Private VLAN trunks do not carry community VLANs.
- When you use private VLANs on the WS-4516 module, old ARP entries will not tim eout of the ARP cache if you do not manually clear the entry. This event has no affect on production.
- Compact flash formatted in Cisco IOS Release 12.2(20)EW should be reformatted in Release 12.2(25)EW on both Supervisor Engine V-10GE and non-Supervisor V-10GE systems. Compact flash formatted on any other release does not need to be reformatted on non-Supervisor Engine V-10GE systems.
- In a redundant system, do not remove and reinsert the standby supervisor engine while the active supervisor engine is booting up. Doing so may cause a failure in the online diagnostics test.
Workaround: Remove and reinsert the standby supervisor engine after the active supervisor engine boots. (CSCsa66509)
- When used in conjunction with a 10-slot chassis, Supervisor Engine V only supports the
Catalyst 4500 series two-port Gigabit Ethernet line card (WS-X4302-GB) in the 10th slot. - The maximum number of unique private VLAN pairs supported by the
switchport private-vlan mapping trunk command is 500. For example, one thousand secondary VLANs could map to one primary VLAN, or one thousand secondary VLANs could map one to one to one thousand primary VLANs. - Support for PoE depends on the use of line cards and power supplies that support PoE.
- The maximum number of mappings for configuring PVLAN promiscuous trunk ports is 500 primary VLANs to 500 secondary VLANs.
- The 802.1X inaccessible authentication bypass feature is not supported with the NAC LAN port IP feature.
- Changes to the console speed in line console 0 configuration mode do not affect console speed in ROMMON. To apply the same console speed in ROMMON, use the confreg ROMMON utility.
- Supervisor Engine II-Plus does not support compact flashes formatted by an Cisco IOS image prior to Cisco IOS Release 12.2(19)EW.
- If a Catalyst 4500 series switch requests information from the Cisco Secure Access Control Server (ACS) and the message exchange times out because the server does not respond, a message similar to following appears:
If this message appears, verify that the switch is connected to the ACS. You should also ensure that the switch has been properly configured as an AAA client on the ACS.
- The bgp shutdown command is not supported in BGP router configuration mode. Entering this command might produce unexpected results.
- A spurious error message appears when an SSH connection disconnects after an idle timeout.
Workaround: Disable idle timeouts. (CSCec30214)
- Interfaces on the module WS-X4148-RJ45V may not establish a link with a Daiden DN-2800G media converter when both the switch and the media converter interfaces are configured to operate at 100 Mbps and full duplex. This situation occurs when the interface on the module is configured to automatically detect and power up devices inline with the power inline auto command. This caveat appears in all software releases.
1. Disable inline power on the switch ports using the power inline never command.
2. Configure the media converter to autonegotiate the speed and duplex instead of running them at 100 Mbps and full duplex. (CSCee62109)
- IPSG for static hosts supports the same port mode as IPSG except that it does not support trunk port:
– It supports Layer 2 access port and PVLAN host port (isolated or community port).
– It does not support trunk port, Layer 3 port, or EtherChannel.
- IPSG for static hosts should not be used on uplink ports.
- Selective DBL is only supported for non-tagged or single-tagged IP packets. To achieve Selective DBL-like functionality with a non-IP packet (like Q-in-Q and IPX), apply an input policy map that matches CoS values and specifies DBL in the class map.
- For Selective DBL, if the topology involves Layer 2 Q in Q tunneling, the match cos policy map will apply to the incoming port.
- If a set of DSCP values are already configured (for example, 0-30, 0-63), specifying a subset of these DSCP values with the qos dbl dscp-based 0-7 command will not remove the unwanted DSCP values of 8 through 63. You must use the no form of the command to remove the extraneous values. In this case, the no qos dbl dscp-based 8-63 command will leave 0-7 selected.
- When you use Port Security with Multi Domain Authentication (MDA) on an interface:
– Allow for at least three MAC addresses to access the switch: two for the phone (the MAC address of a phone gets registered to the Data domain and Voice domain), and one for the PC.
– Ensure that the data and voice VLAN IDs differ.
– As IPSG learns the static hosts on each interface, the switch CPU may achieve 100 percent if there are a large number of hosts to learn. CPU usage will drop after the hosts are learned.
– IPSG violations for static hosts are printed as they occur. If multiple violations occur simultaneously on different interfaces, the CLI displays the last violation. For example, if IPSG is configured for 10 ports and violations exist on ports 3, 6, and 9, the violation messages are printed only for port 9.
– Inactive host bindings will appear in the device tracking table when either a VLAN is associated with another port or a port is removed from a VLAN. So, as hosts are moved across subnets, the hosts appear in the device tracking table as Inactive.
– Autostate SVI does not work on EtherChannel.
- With the resolution of CSCsg08775, a GARP ACL entry is no longer part of the Static CAM area. However, a system-defined GARP class in Control Plane Policing (CPP) still exists.
- Certain configurations on the Catalyst 4507R and Catalyst 4510R chassis exceed the available maximum data power. These configurations include a combination of the follow PIDs:
– Chassis WS-C4507R-E, WS-C4510R-E
– Dual supervisor WS-X45-Sup6-E
– One or more of the models WS-X4448-GB-RJ45 or WS-X4148-FX-MT
To maximize the 10/100/1000 port density of 7- and 10-slot chassis when using redundant Supervisor Engine 6-E, install WS-X4548-GB-RJ45 instead of WS-X4448-GB-RJ45 line cards. If you require WS-X4448-GB-RJ45 line cards, two options are available:
Only four line card slots can be used on the Catalyst 4507R and six line card slots on the
Catalyst 4510R chassis.
When all slots are required, only one model WS-X4448-GB-RJ45 line card can be used.
To maximize the 100-BASE-FX port density of 7 and 10 slot chassis when using Supervisor Engine 6-E install WS-4248-FE-SFP line cards with FX optics instead of WS-X4148-FX-MT line cards. If WS-X4148-FX-MT line cards are required, two options are available:
You can use only 4 linecard slots on the Cat4507R chassis and 6 line card slots on the Cat4510R chassis.
When all slots are required, you can only use one WS-X4448-GB-RJ45 line card.
In such a scenario, the IPv6 MTU value programmed in hardware differs from the IPv6 interface MTU value. This will happen if no room exists in the hardware MTU table to store additional values.
To create room in the table, unconfigure some unused MTU values. Then, either disable or reenable IPv6 on the interface, or reapply the MTU configuration.
- To stop IPSG with static hosts on an interface, use the following commands in interface configuration submode:
To enable IPSG with static hosts on a port, enter the following commands:
If you configure the ip verify source tracking [port-security] interface configuration command on a port without enabling IP device tracking globally or setting an IP device tracking maximum on that interface, IPSG with static hosts reject all the IP traffic from that interface.
Note The preceding condition also applies to IPSG with static hosts on a PVLAN host port.
- You must disable hardware control plane policing by removing the system-cpp-policy named ACL from the controlplane before performing an ISSU upgrade between Cisco IOS Release 12.2(40)SG and a previous release. You cannot detach system-cpp-policy named ACL from the controlplane in previous releases. If you are running a previous release, you must first upgrade to the latest maintenance release in the Cisco IOS Release 12.2(31) SGAx while performing an ISSU upgrade to Cisco IOS Release 12.2(40)SG.
- On a Supervisor Engine V-10GE (WS-X4516-10GE) in a 10-slot chassis (Catalyst 4510R and 4510RE), if a startup configuration with a new uplink mode is copied into flash memory and the system is power cycled, the system will not start with the new uplink mode. After you copy the startup configuration with the new uplink mode into flash memory, you must change the uplink mode to the new uplink mode through the command interface before the system is power cycled. This ensures that the system starts in the new uplink mode.
- When you use Supervisor Engine V in a Catalyst 4510R or 4510R-E chassis, slot 10 (FlexSlot) only supports the following linecards: the two-port GBIC (WS-X4302-GB) and the Access Gateway Module (WS-X4604-GWY). Supervisor Engine V-10GE has this same restriction when you configure its uplink select mode to all. Supervisor Engine V-10GE supports all Catalyst 4500 Series linecards in slot 10 when its uplink select mode is configured as tengigabitethernet or gigabitethernet. Supervisor Engine 6-E supports all Catalyst 4500 series linecards in slot 10.
- Prior to Cisco IOS Release 12.2(50)SG, on switches with Supervisor Engines V, V-10GE and earlier, class-map hit statistics on a user defined class-map in system-cpp-policy are not updated properly. With Cisco IOS Release 12.2(50)SG, the hit statistics for user-defined class-map in the system-cpp-policy are updated properly. However, in per-vlan capture mode, the hit stats for system defined in system-cpp-policy are not updated. In the global capture mode, hit stats for all class-maps (user-defined and system-defined) in the system-cpp-policy are updated properly.
- If you use MDA or multi-auth host mode in conjunction with pre-authentication open access, a switch ignores unicast EAPOL responses.
For Supervisor Engine 6-E and Supervisor Engine 6L-E
- The Catalyst 4510R switch does not support Supervisor Engines 6L-E. Installing an unsupported supervisor engine causes unpredictable hardware behavior that cannot be controlled by the software. Using an unsupported supervisor engine in a redundant slot might cause a supported supervisor engine in the other slot to malfunction.
- The MAC address table is cleared while you switch between supervisor engines if either the 802.1s or 802.1w Spanning Tree Protocol is configured. To minimize address clearing and subsequent packet flooding, configure the edge ports as spanning-tree portfast and the link type as spanning-tree link-type point-to-point.
- IP classful routing is not supported; do not use the no ip classless command; it will have no effect, because only classless routing is supported. The command ip classless is not supported because classless routing is enabled by default.
- A Layer 2 LACP channel cannot be configured with the spanning tree PortFast feature.
- Netbooting using a boot loader image is not supported. See the “Troubleshooting” section for alternatives.
- When you deploy redundant supervisors in a Catalyst 4507R, for hardware that does not exist while the startup configuration file is being parsed, the configuration file for the hardware is not applied.
For example, if the active supervisor engine is in slot 1, and you have configured interface Gi1/1, the supervisor engine in slot 2 becomes active if you remove the active supervisor engine from the chassis. In addition, while the startup configuration file is being parsed, you will receive an error message indicating that interface Gi1/1 is no longer present. This behavior is correct. When the formerly active supervisor engine is reinserted into slot 1, there is no configuration for interface Gi1/1.
This situation will not occur when both supervisor engines are physically in the chassis.
Workaround: Copy the startup configuration file into the running configuration:
- An unsupported default CLI for mobile IP is displayed in the HSRP configuration. Although this CLI will not harm your system, you might want to remove it to avoid confusion.
Workaround: Display the configuration with the show standby command, then remove the CLI. Here is an example of show standby GigabitEthernet1/1 command output:
- For HSRP preempt delay to function consistently, you must use the standby delay minimum command. Be sure to set the delay to more than 1 hello interval, thereby ensuring that a hello is received before HSRP leaves the initiate state.
Use the standby delay reload option if the router is rebooting after reloading the image.
- When you attempt to run OSPF between a Cisco router and a third party router, the two interfaces might get stuck in the Exstart/Exchange state. This problem occurs when the maximum transmission unit (MTU) settings for neighboring router interfaces do not match. If the router with the higher MTU sends a packet larger than the MTU set on the neighboring router, the neighboring router ignores the packet.
Workaround: Ensure that the MTUs match.
- You can run only.1q-in-.1q packet pass-through with Supervisor Engine 6-E.
- For PVST and Catalyst 4500 E-Series switch VLAN, Cisco IOS Release 12.1(13)EW support a maximum of 3000 spanning tree port instances. If you want to use more instances, use MST rather than PVST.
- Because the Supervisor Engine 6-E supports the FAT filesystem, the following restrictions apply:
– The verify and squeeze commands are not supported.
– The rename command is supported in FAT file system.
For Supervisor Engine 6-E, the rename command is available for bootflash and slot0. For all other supervisor engines, the rename command is supported for nvram devices only.
– The fsck command is supported for slot0 device. It is not supported in the file systems on supervisor engines other than 6-E.
– In the FAT file system, the IOS format bootflash: command erases user files only. It does not erase system configuration.
– The FAT file system supports a maximum of 63 characters for file/directory name. The maximum for path length is 127 characters.
– The FAT file system does not support the following characters in file/directory names:{}#%^ and space characters.
– The FAT file system honors the Microsoft Windows file attribute of read-only and read-write, but it does not support the Windows file hidden attribute.
– Supervisor Engine 6-E uses the FAT file system for compact flash (slot0). If a compact flash is not formatted in FAT file system (such as compact flash on a supervisor engine other than 6-E), the switch does not recognize it.
- If an original packet is dropped because of transmit queue shaping or sharing configurations, a SPAN packet copy can still be transmitted on the SPAN port.
- All software releases support a maximum of 16,000 IGMP snooping group entries.
- To maximize performance, use the no ip unreachables command on all interfaces that are configured for ACLs.
- The threshold for the Dynamic Arp Inspection err-disable function is set to 15 ARP packets per second per interface. You should adjust this threshold depending on the network configuration. The CPU should not receive DHCP packets at a sustained rate greater than 1000 pps.
- If you first configure an IP address or IPv6 address on a Layer 3 port, then change the Layer 3 port to a Layer 2 port with the switchport command, and finally change it back to a Layer 3 port, the original IP/IPv6 address is lost.
- In a redundant system, do not remove and reinsert the standby supervisor engine while the active supervisor engine is booting. Doing so may cause the online diagnostics test to fail.
Workaround: Remove and reinsert the standby supervisor engine after the active supervisor engine boots. (CSCsa66509)
- The switchport private-vlan mapping trunk command supports a maximum of 500 unique private VLAN pairs. For example, 500 secondary VLANs could map to one primary VLAN, or 500 secondary VLANs could map to 500 primary VLANs.
- Support for PoE depends on the use of the following line cards and power supplies.
- If a Catalyst 4500 series switch requests information from the Cisco Secure Access Control Server (ACS) and the message exchange times out because the server does not respond, a message similar to this appears:
If this message appears, ensure network connectivity exists between the switch and the ACS. Also check that the switch has been properly configured as an AAA client on the ACS.
– As IPSG learns the static hosts on each interface, the switch CPU may achieve 100 percent if there are a large number of hosts to learn. The CPU usage will drop after the hosts are learned.
– IPSG violations for static hosts are printed as they occur. If multiple violations occur simultaneously on different interfaces, the CLI displays the last violation. For example, if IPSG is configured for 10 ports and violations exist on ports 3,6, and 9, the violation messages are printed only for port 9.
– Inactive host bindings will appear in the device tracking table when either a VLAN is associated with another port or a port is removed from a VLAN. So, as hosts are moved across subnets, the hosts appear in the device tracking table as inactive.
– Autostate SVI does not work on EtherChannel.
In such a scenario, the IPv6 MTU value programmed in hardware differs from the IPv6 interface MTU value. This occurs if no room exists in the hardware MTU table to store additional values.
To create room, unconfigure some unused MTU values. Then, either disable or re-enable IPv6 on the interface, or reapply the MTU configuration.
- To stop IPSG with static hosts on an interface, use the following commands in interface configuration submode:
To enable IPSG with static hosts on a port, enter the following commands:
If you configure the ip verify source tracking [port-security] interface configuration command on a port without enabling IP device tracking globally or setting an IP device tracking maximum on that interface, IPSG with static hosts reject all the IP traffic from that interface.
Note The preceding condition also applies to IPSG with static hosts on a PVLAN host port.
- uRPF supports up to four paths. If a packet arrives at one of the valid VLANs that is not programmed as one of the RPF VLAN in hardware, it is dropped. If traffic may arrive from any other interfaces without RPF configured, it can be switched.
- Input and output ACLs cannot override or filter traffic received on an uRPF interface.
- No CLI command exists to reflect uRPF drop packets during hardware switching. The sh ip traffic and show cef int commands do not reflect uRPF drops.
- IPv6 ACL is not supported on a switchport. IPv6 packets cannot be filtered on switchports using any of the known methods: PACL, VACL, or MACLs.
- Class-map match statements using match ip prec | dscp match only IPv4 packets, whereas matches performed with match prec | dscp match both IPv4 and IPv6 packets.
- IPv6 QoS hardware switching is disabled if the policy-map contains IPv6 ACL and match CoS in the same class-map with the IPv6 access-list has any mask within the range /81 and /127. This situation causes forwarding packets to software, which efficiently disables the QoS.
- When the following data-only Catalyst 4500 linecards are used in a Catalyst 4507R-E or 4510R-E chassis with Supervisor Engine 6-Es, the capacity of the power supply may be exceeded:
– WS-X4148-FX-MT Cisco Catalyst 4500 Fast Ethernet Switching Module, 48-port 100BASE-FX (MT-RJ)
– WS-X4448-GB-RJ45 Cisco Catalyst 4500 48-port 10/100/1000 Module (RJ-45)
The Catalyst 4503-E and Catalyst 4506-E have no caveats. The Catalyst 4507R-E configurations that use power supplies rated at 1400 W or above also have no caveats.
The following replacement switching modules will not exceed the power supply capacity for any Catalyst 4500-E chassis:
Refer to the Catalyst 4500 Series Module Installation Guide to determine the power requirements for all of the Catalyst 4500 linecards and the power capacities of the Catalyst 4500 power supplies.
- Supervisor Engine 6-E only supports Catalyst 4500 Series linecards in slots 8-10.
- If you remove a line card from a redundant switch and initiate an SSO switch-over, then reinsert the line card, all interfaces are shutdown. The remaining configuration on the original line card is preserved.
This situation only occurs if a switch reached SSO before you removed the line card.
- On Supervisor Engine 6-E, upstream ports support flow control auto negotiation in 1G mode only, and flow control is forced in 10G mode. If the interface is configured to auto-negotiate the flow control, and the interface is operating in 10G mode, the system forces flow control to ON and does not auto-negotiate.
- Supervisor Engine 6-E supports fast UDLD on a maximum of 32 ports.
- With Cisco IOS Release 12.2(53)SG3 (and 12.2(54)SG), we changed the default behavior such that your single supervisor, RPR, or fixed configuration switch does not reload automatically. To configure automatic reload, you must enter the diagnostic fpga soft-error recover aggressive command. (CSCth16953)
Caveats
Caveats describe unexpected behavior in Cisco IOS releases. Caveats listed as open in a prior release are carried forward to the next release as either open or resolved.
Note All caveats in Release 12.4 also apply to the corresponding 12.1 E releases. Refer to the Caveats for Cisco IOS Release 12.4 publication at the following URL:
http://www.cisco.com/en/US/docs/ios/12_4/release/notes/124MCAVS.html
Note For the latest information on PSIRTS, refer to the Security Advisories on CCO at the following URL:
http://tools.cisco.com/security/center/publicationListing
Cisco Bug Search Tool
The Bug Search Tool (BST), which is the online successor to Bug Toolkit, is designed to improve the effectiveness in network risk management and device troubleshooting. The BST allows partners and customers to search for software bugs based on product, release, and keyword, and aggregates key data such as bug details, product, and version. The tool has a provision to filter bugs based on credentials to provide external and internal bug views for the search input.
To view the details of a caveat listed in this document:
1. Access the BST (use your Cisco user ID and password) at https://tools.cisco.com/bugsearch/.
Resolved Caveats in Cisco IOS Release 15.0(2)SG11
Use the Bug Search Tool to view the details of a caveat listed in this section:
Open Caveats for Cisco IOS Release 15.0(2)SG10
- The Cisco IOS -XE software for Catalyst 4500 Series switches includes a version of Bash that is affected by the vulnerabilities identified by the following Common Vulnerability and Exposures (CVE) IDs:
Cisco has analyzed this vulnerability and concluded that while the previously listed products may run a vulnerable version of Bash, there are no exploitation vectors present - therefore, those products are not impacted.
Additional details about those vulnerabilities can be found at http://cve.mitre.org/cve/cve.html
- When you enter the ip http secure-server command (or if the system reads it from the startup configuration), the device searches for a persistent self-signed certificate during boot up.
– If such a certificate does not exist and the device's hostname and default_domain are set, then a persistent self-signed certificate is generated.
– If such a certificate exists, the FQDN in the certificate is compared with the current device's hostname and default_domain. If either differs from the FQDN in the certificate, the existing persistent self-signed certificate is replaced with a new one with the updated FQDN. Be aware that the existing key pair is used in the new certificate.
On a switch that supports redundancy, the generation of the self-signed certificate occurs independently on the active and the standby supervisor engines, and the certificates differ. After switchover, the HTTP client that holds the old certificate cannot connect to the HTTPS server.
Workaround: Reconnect. CSCsb11964
- When policing IEEE 802.1Q tagged non-IP traffic and calculating traffic conformance, the policer excludes the four bytes that constitute the 802.1Q tag even when you enter the
qos account layer2 encapsulation command.
- When hard-coded duplex and speed settings are deleted after an interface shuts down, an a- is added to the duplex and speed in the output from the show interface status command.
This does not affect performance.
Workaround: Enter the no shutdown command. CSCsg27395
- When a transceiver is removed rapidly from one port and placed in another on the same chassis, occasionally a duplicate seeprom message appears and the port is not able to handle traffic.
Workaround: Remove the transceiver from the new port and place it in the old port. After the SFP is recognized in the old port, remove it slowly and insert it in the new port. (CSCse34693)
- When performing an ISSU upgrade and the versions of the active and standby supervisor engines differ, you see the following message in the standby supervisor engine console:
Workaround: None. This is an informational message. CSCsi60898
Workarounds: Do one of the following:
– After a reload, copy the startup-config to the running-config.
– Use a loopback interface as the target of the ip unnumbered command.
– Change the CLI configuration so that during bootup the router port is created first.
- In SSO mode, when a port channel is created, deleted, and recreated on an active supervisor engine with the same channel number, the standby port channel state goes out of sync. After a switch over, the following message displays:
Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the port channel, create a new channel. CSCsr00333
- VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, you will not see the VLAN updates on the other switches in the VTP domain.
Workaround: Configure an ISL/dot1q trunk port. CSCsu43445
- When you remove a line card containing ports configured with IGMP snooping while booting a standby supervisor engine, the active supervisor engine does not synchronize this configuration to the standby supervisor engine as a part of a bulk synchronization. When you reinstall the line card, the configuration in the active and standby supervisor engines will differ.
Workaround: Do one of the following:
– Reload the standby switch again with the line card in place.
– Remove and reenter the commands on the active supervisor engine. The standby supervisor engine will acquire this change. CSCsv44866
- After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:
This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG
- The host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.
If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.
Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661
- On a wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.
This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.
Workaround: Use the VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS.
The IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored.
- On a Layer 2 port (that is, a switchport) of Supervisor Engine II+ thru V-10GE, the
|auto qos voice trust command auto generates qos trust cos configuration, in addition to other parameters. However, when the port is converted from Layer 2 to Layer 3 with the no switchport command, the qos trust dscp command should be generated.
Workaround: When interface mode is changed from Layer2 to Layer3, manually change interface trust state by enter the cos trust dscp command. CSCta16492
- When you run Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, or later releases and configure switchport block multicast on a switch, Layer 2 multicast is not blocked. IPv4 and IPV6 unknown multicast traffic is blocked.
Prior to Cisco IOS Release 12.2(53)SG1 and 12.2(50)SG6, the switchport block multicast command blocks IP Multicast, Layer 2 multicast, and broadcast traffic. CSCta61825
- If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for a Catalyst 4900M switch, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.
Despite the different default value, you can configure any value in the time range.
- On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.
Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677
- After you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.
Similarly, the show epm sessions command always displays the authentication method as DOT1X.
Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157
- With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.
- When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.
Workaround: Configure both dead-criteria and deadtime.
- When spanning tree is changed from PVST to Rapid PVST, and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.
Workaround: Enter shut, and then no shut on the ports. CSCtn88228
- A device in a Guest VLAN that is connected behind a phone capable of 2nd-port-TLV, experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you reboot a switch, the configured value of the interface MTU size on the members of the port channel interface does not function for IPv6 traffic.
Workaround: After the switch reloads, enter shut, and then no shut on the port channel interface.
- If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.
- When you have two Layer 3 CE-facing interfaces, each connected to a CE to split WCCP between the CEs, and you move a WCCP service (such as 60 (ftp-native)) from one interface to the other, the target interface fails to completely transfer the service from the old to the new CE.
Workaround: Shut down the CE-facing interface. After all of the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941
- Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.
Workaround: Remove these operators from any dynamic ACLs. CSCts05302
Not Supported on Supervisor Engine 6-E
Supervisor Engine 6-E and Supervisor Engine 6L-E Specific Caveats
- Occasionally, if you use an X2 SR transceiver on a WS-X4706-10GE running
Cisco IOS Release 12.2(40)SG, you observe CRC errors after a reload or power cycle upon inserting the card or X2.
Workaround: Reinsert the X2. CSCsk43618
- If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.
Workaround: Enter the show policy-map interface command to find the actual burst value programmed. CSCsi71036
- When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.
If you enter the show policy-map name, however, the unconditional marking actions appear. CSCsi94144
- Supervisor Engine II-Plus-TS in a Catalyst 4503-E chassis running ROMMON lists the chassis type as Unknown. After booting Cisco IOS, the chassis type is listed properly.
- Uplinks go down when you upgrade the ROMMON of an WS-X45-SUP6-E supervisor from version 0.34 to a later version.
This behavior occurs in a redundant switch when the active supervisor engine is running Cisco IOS, the standby supervisor engine is in ROMMON, and the standby supervisor engine’s ROMMON is upgraded from version 0.34 or to a later version. The upgrade process causes the uplinks on the standby supervisor engine to go down but the active supervisor engine is unaware of this.
Workarounds: To resume normal operation, do one of the following:
– Reload both supervisor engines with the redundancy reload shelf command.
– Power-cycle the standby supervisor engine by briefly pulling it from the chassis.
There is no workaround for the link flap issue. CSCsm81875
This problem can happen when pause frames are sent to a switch port and the flow control receive configuration is toggled on a 10-Gigabit Ethernet port.
Workaround: Change the flow control receive configuration when no traffic exists. CSCso71647
- If an EtherChannel is a member of a FlexLink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (FlexLink failure).
- When a CFM Inward Facing MEP (IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
IFM CC Status as inactive. When you allocate the VLAN, the CC-status remains inactive.
You only see this behavior if you initially did not allocate a VLAN before you configure the IFM, and then later allocate the same VLAN.
Workaround: Unconfigure, and then reconfigure the IFM on the port.
- When you configure vlan dot1q tag native globally on Supervisor Engine 6-E, MST control packets are tagged on egress on the native VLAN. This conflicts with 802.1s. The Cisco 7600 Series router drops its MST proposal agreements (because it expects the native VLAN MST control packets to be untagged), causing 30 seconds of traffic loss while spanning tree converges.
Workaround: Disable native VLAN tagging on the trunk port of the switch by entering the
no switchport trunk native vlan tag command. CSCsz12611
- Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:
Workaround: No functional impact.
You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063
- If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.
Workaround: Reduce the number of VLAN mappings. CSCtn56208
- WCCP service is not reacquired when a service group with a multicast group address is unconfigured, and then reconfigured.
Workaround: Configure IP multicast routing globally and establish IP PIM sparse dense mode on the CE-facing interface. CSCtl97692
- If an interface whose IP address is being used as the router ID is deleted or shuts down, and you configure a service group with a multicast group address, packet redirection to CE stops and packets are forwarded directly to the destination.
Workaround: Unconfigure and reconfigure the service group. CSCtn88087
- Global WCCP service configuration fails to enable (WCCP global configuration is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.
Workaround: Enable a Layer 3 interface in the running configuration. CSCsc88636.
– Links flap for various Layer 3 protocols.
– A traffic loss of several seconds occurs during the upgrade process.
Workaround: Do not use the quick option with the issu changeversion command.
Resolved Caveats in Cisco IOS Release 15.0(2)SG10
- Certain modules X4748 modules for the 4500 switching system unexpectedly drop traffic, considering them giants ( any Ethernet packet that is greater than 1518 bytes is considered a giant). Affected modules include:
The problem is seen only on modules running Cisco IOS Release IOS-XE 03.02.n.SG.
Certain revisions of the X4748 module display this behavior when running on IOS-XE version 03.02.n.SG. Not all X4748 modules will present this behavior, and it will not show up on newer versions of IOS-XE like 03.04.n.SG or 03.06.n.E.
Workaround : Increasing the MTU on an affected interface to 1518 or higher will allow the traffic through. Upgrading to an IOS-XE version where this issue is not present will resolve the issue. CSCus15382
Resolved Caveats for Cisco IOS Release 15.0(2)SG9
- The Cisco IOS Software network address translation (NAT) feature contains multiple denial of service (DoS) vulnerabilities in the translation of the following protocols:
– NetMeeting Directory (Lightweight Directory Access Protocol, LDAP)
– Session Initiation Protocol (Multiple vulnerabilities)
All the vulnerabilities described in this document are caused by packets in transit on the affected devices when those packets require application layer translation. Cisco has released free software updates that address these vulnerabilities. This advisory is posted at http://www.cisco.com/warp/public/707/cisco-sa-20110928-nat.shtml CSCtd10712
- The Cisco IOS Software implementation of the virtual routing and forwarding (VRF) aware network address translation (NAT) feature contains a vulnerability when translating IP packets that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are not available.
This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20130327-nat
Note The March 27, 2013, Cisco IOS Software Security Advisory bundled publication includes seven Cisco Security Advisories. All advisories address vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security Advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all Cisco IOS Software vulnerabilities in the March 2013 bundled publication.
Individual publication links are in the Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication at the following link: http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar13.html CSCtg47129
Workaround. None - You cannot configure the event4 exit-value CSCtl70569"
- The Cisco IOS Software Internet Key Exchange (IKE) feature contains a denial of service (DoS) vulnerability. Cisco has released free software updates that address this vulnerability. This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-ike
Note The March 28, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the March 2012 bundled publication.
Individual publication links are in Cisco Event Response: Semi-Annual Cisco IOS Software Security Advisory Bundled Publication at the following link: http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html CSCts38429"
– router reload / LC OIR with images after RLS10.
– traffic flows through the ES20 interface
– mac-address-table limit CLI is configured.
Workaround: mac-address-table limit is removed.
Note The March 28, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the March 2012 bundled publication.
Individual publication links are in the Cisco Event Response: Semi-Annual Cisco IOS Software Security Advisory Bundled Publication at the following link: http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html CSCtt28573
- The Cisco IOS Software implementation of the Network Address Translation (NAT) feature contains two vulnerabilities when translating IP packets that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
Cisco has released free software updates that address these vulnerabilities. There are no workarounds to mitigate these vulnerabilities.
This advisory is available at the following link: http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140326-nat
Note The March 26, 2014, Cisco IOS Software Security Advisory bundled publication includes six Cisco Security Advisories. All advisories address vulnerabilities in Cisco IOS Software. Each Cisco IOS Software Security Advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all Cisco IOS Software vulnerabilities in the March 2014 bundled publication.
Individual publication links are in the Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication at the following link: http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar14.html. See published Cisco Security Advisory CSCue00996
- Minor or major temperature alarms are reported in the syslog along with the following DATACORRUPTION logs:
The symptom is observed on ES+ series linecards of Cisco 7600 Series Routers.
This happens when you continuously reload the standby switch. The client, that is, the active side cannot reach the standby side, and while returning an error, the FD is not released and exhausts FDs. The maximum number of allowed FDs is 128. When this limit is reached, additional files cannot be opened.
Workaround: Reload the switch. CSCug77784
– The show process cpu privileged EXEC command for 'Cat4k Mgmt LoPri'
– The show platform health privileged EXEC command under KxAclPathMan update
The increase is observed when configuring input and output service policies on trunk links that carry numerous VLANs, which, in turn, are enabled with other ACL based features (For examplem access-groups and PBR).
Workaround: Reduce CPU utilization by removing unnecessary service policies from the trunk links. CSCui19835
- The Cisco Catalyst 4500 Series Switch crashes occasionally when multiple, simultaneous web authentication sessions affect the switch.
Workaround: Avoid custom pages. CSCui71349
- In PIM-DM mode, on a Cisco Catalyst 4948-E switch that is not the first hop router, the first mcast packet is dropped.
- Removing a VLAN Mapping statement causes all traffic to be consistently dropped for other VLAN mapping statements.
– If you want to remove VLAN mapping on 12, but you need mapping on 13 to work, perform these steps:
a. Enter the interface gigabitethernet 2/1 interface configuration command
b. Enter the no switchport vlan mapping 12 dot1q-tunnel 200 interface configuration command
c. Enter the no switchport vlan mapping 13 dot1q-tunnel 200 interface configuration command
d. Enter the switchport vlan mapping 13 dot1q-tunnel 200 interface configuration command
– If you want to restore the original VLAN mapping statement, perform these steps
a. Enter the i nterface gigabitethernet 2/1 interface configuration command
b. Enter the no switchport vlan mapping 12 dot1q-tunnel 200 interface configuration command
c. Enter the switchport vlan mapping 12 dot1q-tunnel 200 interface configuration command
– Enter the shutdown interface configuration command to shut down the port, remove configuration, and then enter the no shutdown interface configuration command.
- When you configure the ip igmp mroute-proxy interface configuration command and you reload the switch, the switch removes the command. The following example illustrates this problem:
Workaround: Reapply the configuration when the switch reboots. CSCum71764
- When an open-ring REP segment is configured with preemption, it fails to revert to a well-known topology after link state change between a pair of transit neighbors.
- If Supervisor Engine 2 running Cisco IOS Release 12.2(53)SG6 and a phone and PC are connected to a port in multi-auth mode with authentication open, and both devices are authenticated (or authorized) via MAB, after 30 seconds, both sessions are removed without any reason:
- Software returns incorrect permanent license type (mib value) from day 1. The license MIB value should be 4, but the software returns zero. The enum value cannot be changed because it leads to an ISSU breakage (a new TDL version is introduced).
Workaround: None. The license MIB value for the permanent license type is 4 for all Cisco Catalyst 4000 series products. CSCuo90172
- MAB does not trigger for devices if they are connected to a port before authentication is configured, provided the port is configured in authentication open mode.
Workaround: Issue clear mac address dynamic to clear the MAC addresses on the switch and cause MAB to trigger when the MAC address is re-learned. CSCul32730
- Problem with adding new ports to a channel group. When you configure the switchport private-vlan mapping trunk <vlan#1> <vlan#2> command on a port and try to add that port to a channel group where the switchport private-vlan mapping trunk command is not configured, the following error message is displayed:
Resolved Caveats in Cisco IOS Release 15.0(2)SG8
This section lists the resolved caveats in Release 15.0(2)SG8:
- If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.
Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.
Workaround: Retain the trunk native V LAN as 1. CSCud05521
- If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.
Workaround: Return a dACL in the authorization profile with successful guest authentication.
- If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:
– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.
– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.
If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.
Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646
- If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.
Workaround: Configure RADIUS test and dead criteria.
- In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.
Workaround: Enter the show platform software interface Gix/xx statistic command.
Open Caveats for Cisco IOS Release 15.0(2)SG6
This section lists the open caveats for Cisco IOS Release 15.0(2)SG6:
- When you enter the ip http secure-server command (or if the system reads it from the startup configuration), the device searches for a persistent self-signed certificate during boot up.
– If such a certificate does not exist and the device's hostname and default_domain are set, then a persistent self-signed certificate is generated.
– If such a certificate exists, the FQDN in the certificate is compared with the current device's hostname and default_domain. If either differs from the FQDN in the certificate, the existing persistent self-signed certificate is replaced with a new one with the updated FQDN. Be aware that the existing key pair is used in the new certificate.
On a switch that supports redundancy, the generation of the self-signed certificate occurs independently on the active and the standby supervisor engines, and the certificates differ. After switchover, the HTTP client that holds the old certificate cannot connect to the HTTPS server.
Workaround: Reconnect. CSCsb11964
- When policing IEEE 802.1Q tagged non-IP traffic and calculating traffic conformance, the policer excludes the four bytes that constitute the 802.1Q tag even when you enter the
qos account layer2 encapsulation command.
- When hard-coded duplex and speed settings are deleted after an interface shuts down, an a- is added to the duplex and speed in the output from the show interface status command.
This does not affect performance.
Workaround: Enter the no shutdown command. CSCsg27395
- When a transceiver is removed rapidly from one port and placed in another on the same chassis, occasionally a duplicate seeprom message appears and the port is not able to handle traffic.
Workaround: Remove the transceiver from the new port and place it in the old port. After the SFP is recognized in the old port, remove it slowly and insert it in the new port. (CSCse34693)
- When performing an ISSU upgrade and the versions of the active and standby supervisor engines differ, you see the following message in the standby supervisor engine console:
Workaround: None. This is an informational message. CSCsi60898
Workarounds: Do one of the following:
– After a reload, copy the startup-config to the running-config.
– Use a loopback interface as the target of the ip unnumbered command.
– Change the CLI configuration so that during bootup the router port is created first.
- In SSO mode, when a port channel is created, deleted, and recreated on an active supervisor engine with the same channel number, the standby port channel state goes out of sync. After a switch over, the following message displays:
Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the port channel, create a new channel. CSCsr00333
- VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, you will not see the VLAN updates on the other switches in the VTP domain.
Workaround: Configure an ISL/dot1q trunk port. CSCsu43445
- When you remove a line card containing ports configured with IGMP snooping while booting a standby supervisor engine, the active supervisor engine does not synchronize this configuration to the standby supervisor engine as a part of a bulk synchronization. When you reinstall the line card, the configuration in the active and standby supervisor engines will differ.
Workaround: Do one of the following:
– Reload the standby switch again with the line card in place.
– Remove and reenter the commands on the active supervisor engine. The standby supervisor engine will acquire this change. CSCsv44866
- After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:
This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG
- The host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.
If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.
Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661
- If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
show policy-map interface command are wrong.
The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149
- On a wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.
This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.
Workaround: Use the VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS.
The IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored.
- On a Layer 2 port (that is, a switchport) of Supervisor Engine II+ thru V-10GE, the
|auto qos voice trust command auto generates qos trust cos configuration, in addition to other parameters. However, when the port is converted from Layer 2 to Layer 3 with the no switchport command, the qos trust dscp command should be generated.
Workaround: When interface mode is changed from Layer2 to Layer3, manually change interface trust state by enter the cos trust dscp command. CSCta16492
- When you run Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, or later releases and configure switchport block multicast on a switch, Layer 2 multicast is not blocked. IPv4 and IPV6 unknown multicast traffic is blocked.
Prior to Cisco IOS Release 12.2(53)SG1 and 12.2(50)SG6, the switchport block multicast command blocks IP Multicast, Layer 2 multicast, and broadcast traffic. CSCta61825
- If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for a Catalyst 4900M switch, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.
Despite the different default value, you can configure any value in the time range.
- On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.
Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677
- After you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.
Similarly, the show epm sessions command always displays the authentication method as DOT1X.
Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157
- With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.
- When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.
Workaround: Configure both dead-criteria and deadtime.
- When spanning tree is changed from PVST to Rapid PVST, and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.
Workaround: Enter shut, and then no shut on the ports. CSCtn88228
- If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.
Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437
- A device in a Guest VLAN that is connected behind a phone capable of 2nd-port-TLV, experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.
- When you have two Layer 3 CE-facing interfaces, each connected to a CE to split WCCP between the CEs, and you move a WCCP service (such as 60 (ftp-native)) from one interface to the other, the target interface fails to completely transfer the service from the old to the new CE.
Workaround: Shut down the CE-facing interface. After all of the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941
- Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.
Workaround: Retain the trunk native V LAN as 1. CSCud05521
- If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.
Workaround: Return a dACL in the authorization profile with successful guest authentication.
- If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:
– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.
– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.
If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.
Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646
- If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.
Not Supported on Supervisor Engine 6-E
Supervisor Engine 6-E and Supervisor Engine 6L-E Specific Caveats
- Occasionally, if you use an X2 SR transceiver on a WS-X4706-10GE running
Cisco IOS Release 12.2(40)SG, you observe CRC errors after a reload or power cycle upon inserting the card or X2.
Workaround: Reinsert the X2. CSCsk43618
- If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.
Workaround: Enter the show policy-map interface command to find the actual burst value programmed. CSCsi71036
- When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.
If you enter the show policy-map name, however, the unconditional marking actions appear. CSCsi94144
- Supervisor Engine II-Plus-TS in a Catalyst 4503-E chassis running ROMMON lists the chassis type as Unknown. After booting Cisco IOS, the chassis type is listed properly.
- Uplinks go down when you upgrade the ROMMON of an WS-X45-SUP6-E supervisor from version 0.34 to a later version.
This behavior occurs in a redundant switch when the active supervisor engine is running Cisco IOS, the standby supervisor engine is in ROMMON, and the standby supervisor engine’s ROMMON is upgraded from version 0.34 or to a later version. The upgrade process causes the uplinks on the standby supervisor engine to go down but the active supervisor engine is unaware of this.
Workarounds: To resume normal operation, do one of the following:
– Reload both supervisor engines with the redundancy reload shelf command.
– Power-cycle the standby supervisor engine by briefly pulling it from the chassis.
There is no workaround for the link flap issue. CSCsm81875
This problem can happen when pause frames are sent to a switch port and the flow control receive configuration is toggled on a 10-Gigabit Ethernet port.
Workaround: Change the flow control receive configuration when no traffic exists. CSCso71647
- If an EtherChannel is a member of a FlexLink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (FlexLink failure).
- When a CFM Inward Facing MEP (IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
IFM CC Status as inactive. When you allocate the VLAN, the CC-status remains inactive.
You only see this behavior if you initially did not allocate a VLAN before you configure the IFM, and then later allocate the same VLAN.
Workaround: Unconfigure, and then reconfigure the IFM on the port.
- When you configure vlan dot1q tag native globally on Supervisor Engine 6-E, MST control packets are tagged on egress on the native VLAN. This conflicts with 802.1s. The Cisco 7600 Series router drops its MST proposal agreements (because it expects the native VLAN MST control packets to be untagged), causing 30 seconds of traffic loss while spanning tree converges.
Workaround: Disable native VLAN tagging on the trunk port of the switch by entering the
no switchport trunk native vlan tag command. CSCsz12611
- Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:
Workaround: No functional impact.
You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063
- If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.
Workaround: Reduce the number of VLAN mappings. CSCtn56208
- WCCP service is not reacquired when a service group with a multicast group address is unconfigured, and then reconfigured.
Workaround: Configure IP multicast routing globally and establish IP PIM sparse dense mode on the CE-facing interface. CSCtl97692
- If an interface whose IP address is being used as the router ID is deleted or shuts down, and you configure a service group with a multicast group address, packet redirection to CE stops and packets are forwarded directly to the destination.
Workaround: Unconfigure and reconfigure the service group. CSCtn88087
- Global WCCP service configuration fails to enable (WCCP global configuration is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.
Workaround: Enable a Layer 3 interface in the running configuration. CSCsc88636.
– Links flap for various Layer 3 protocols.
– A traffic loss of several seconds occurs during the upgrade process.
Workaround: Do not use the quick option with the issu changeversion command.
- In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.
Workaround: Enter the show platform software interface Gix/xx statistic command.
Resolved Caveats in Cisco IOS Release 15.0(2)SG6
This section lists the resolved caveats in Release 15.0(2)SG6:
- A %SYS-2-NOBLOCK or %SYS-2-BLOCKHUNG message may appear on the switch when an interface with a QoS policy changes speed at the same time information about that interface is being collected (most commonly through a CLI like the show policy-map... command). Although the QoS policy programming might fail for that interface, no operational impact is observed.
- In a square Layer 2 topology (of at least four switches) where the root bridge is outside of the square (a fifth switch), one link in the square that transitions its role from alternate to root will not send topology change notifications. A stale MAC address may exist in the table until age-out.
Workaround: Reduce MAC aging time or modify Layer 2 topology so that the root is within the square. CSCtx86107
provided the following conditions apply:
– A switchport is configured with the following:
authentication event server dead action authorize
authenticaton event server alive action reinitalize
– The RADIUS server was down previously, and a port without traffic (for example, a hub with no devices attached) was authorized into the inaccessible authentication bypass (IAB) VLAN without an associated MAC address.
The RADIUS server becomes available again, and the IAB-authorized port transitions to another state.
Open Caveats for Cisco IOS Release 15.0(2)SG5
This section lists the open caveats for Cisco IOS Release 15.0(2)SG5:
- When you enter the ip http secure-server command (or if the system reads it from the startup configuration), the device searches for a persistent self-signed certificate during boot up.
– If such a certificate does not exist and the device's hostname and default_domain are set, then a persistent self-signed certificate is generated.
– If such a certificate exists, the FQDN in the certificate is compared with the current device's hostname and default_domain. If either differs from the FQDN in the certificate, the existing persistent self-signed certificate is replaced with a new one with the updated FQDN. Be aware that the existing key pair is used in the new certificate.
On a switch that supports redundancy, the generation of the self-signed certificate occurs independently on the active and the standby supervisor engines, and the certificates differ. After switchover, the HTTP client that holds the old certificate cannot connect to the HTTPS server.
Workaround: Reconnect. CSCsb11964
- When policing IEEE 802.1Q tagged non-IP traffic and calculating traffic conformance, the policer excludes the four bytes that constitute the 802.1Q tag even when you enter the
qos account layer2 encapsulation command.
- When hard-coded duplex and speed settings are deleted after an interface shuts down, an a- is added to the duplex and speed in the output from the show interface status command.
This does not affect performance.
Workaround: Enter the no shutdown command. CSCsg27395
- When a transceiver is removed rapidly from one port and placed in another on the same chassis, occasionally a duplicate seeprom message appears and the port is not able to handle traffic.
Workaround: Remove the transceiver from the new port and place it in the old port. After the SFP is recognized in the old port, remove it slowly and insert it in the new port. (CSCse34693)
- When performing an ISSU upgrade and the versions of the active and standby supervisor engines differ, you see the following message in the standby supervisor engine console:
Workaround: None. This is an informational message. CSCsi60898
Workarounds: Do one of the following:
– After a reload, copy the startup-config to the running-config.
– Use a loopback interface as the target of the ip unnumbered command.
– Change the CLI configuration so that during bootup the router port is created first.
- In SSO mode, when a port channel is created, deleted, and recreated on an active supervisor engine with the same channel number, the standby port channel state goes out of sync. After a switch over, the following message displays:
Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the port channel, create a new channel. CSCsr00333
- VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, you will not see the VLAN updates on the other switches in the VTP domain.
Workaround: Configure an ISL/dot1q trunk port. CSCsu43445
- When you remove a line card containing ports configured with IGMP snooping while booting a standby supervisor engine, the active supervisor engine does not synchronize this configuration to the standby supervisor engine as a part of a bulk synchronization. When you reinstall the line card, the configuration in the active and standby supervisor engines will differ.
Workaround: Do one of the following:
– Reload the standby switch again with the line card in place.
– Remove and reenter the commands on the active supervisor engine. The standby supervisor engine will acquire this change. CSCsv44866
- After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:
This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG
- The host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.
If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.
Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661
- If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
show policy-map interface command are wrong.
The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149
- On a wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.
This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.
Workaround: Use the VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS.
The IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored.
- On a Layer 2 port (that is, a switchport) of Supervisor Engine II+ thru V-10GE, the
|auto qos voice trust command auto generates qos trust cos configuration, in addition to other parameters. However, when the port is converted from Layer 2 to Layer 3 with the no switchport command, the qos trust dscp command should be generated.
Workaround: When interface mode is changed from Layer2 to Layer3, manually change interface trust state by enter the cos trust dscp command. CSCta16492
- When you run Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, or later releases and configure switchport block multicast on a switch, Layer 2 multicast is not blocked. IPv4 and IPV6 unknown multicast traffic is blocked.
Prior to Cisco IOS Release 12.2(53)SG1 and 12.2(50)SG6, the switchport block multicast command blocks IP Multicast, Layer 2 multicast, and broadcast traffic. CSCta61825
- If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for a Catalyst 4900M switch, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.
Despite the different default value, you can configure any value in the time range.
- On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.
Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677
- After you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.
Similarly, the show epm sessions command always displays the authentication method as DOT1X.
Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157
- With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.
- When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.
Workaround: Configure both dead-criteria and deadtime.
- When spanning tree is changed from PVST to Rapid PVST, and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.
Workaround: Enter shut, and then no shut on the ports. CSCtn88228
- If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.
Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437
- A device in a Guest VLAN that is connected behind a phone capable of 2nd-port-TLV, experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you reboot a switch, the configured value of the interface MTU size on the members of the port channel interface does not function for IPv6 traffic.
Workaround: After the switch reloads, enter shut, and then no shut on the port channel interface.
- If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.
- When you have two Layer 3 CE-facing interfaces, each connected to a CE to split WCCP between the CEs, and you move a WCCP service (such as 60 (ftp-native)) from one interface to the other, the target interface fails to completely transfer the service from the old to the new CE.
Workaround: Shut down the CE-facing interface. After all of the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941
- Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.
Workaround: Remove these operators from any dynamic ACLs. CSCts05302
- Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.
Workaround: Retain the trunk native V LAN as 1. CSCud05521
- If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.
Workaround: Return a dACL in the authorization profile with successful guest authentication.
- If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:
– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.
– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.
If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.
Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646
- If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.
Not Supported on Supervisor Engine 6-E
Supervisor Engine 6-E and Supervisor Engine 6L-E Specific Caveats
- Occasionally, if you use an X2 SR transceiver on a WS-X4706-10GE running
Cisco IOS Release 12.2(40)SG, you observe CRC errors after a reload or power cycle upon inserting the card or X2.
Workaround: Reinsert the X2. CSCsk43618
- If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.
Workaround: Enter the show policy-map interface command to find the actual burst value programmed. CSCsi71036
- When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.
If you enter the show policy-map name, however, the unconditional marking actions appear. CSCsi94144
- Supervisor Engine II-Plus-TS in a Catalyst 4503-E chassis running ROMMON lists the chassis type as Unknown. After booting Cisco IOS, the chassis type is listed properly.
- Uplinks go down when you upgrade the ROMMON of an WS-X45-SUP6-E supervisor from version 0.34 to a later version.
This behavior occurs in a redundant switch when the active supervisor engine is running Cisco IOS, the standby supervisor engine is in ROMMON, and the standby supervisor engine’s ROMMON is upgraded from version 0.34 or to a later version. The upgrade process causes the uplinks on the standby supervisor engine to go down but the active supervisor engine is unaware of this.
Workarounds: To resume normal operation, do one of the following:
– Reload both supervisor engines with the redundancy reload shelf command.
– Power-cycle the standby supervisor engine by briefly pulling it from the chassis.
There is no workaround for the link flap issue. CSCsm81875
This problem can happen when pause frames are sent to a switch port and the flow control receive configuration is toggled on a 10-Gigabit Ethernet port.
Workaround: Change the flow control receive configuration when no traffic exists. CSCso71647
- If an EtherChannel is a member of a FlexLink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (FlexLink failure).
- When a CFM Inward Facing MEP (IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
IFM CC Status as inactive. When you allocate the VLAN, the CC-status remains inactive.
You only see this behavior if you initially did not allocate a VLAN before you configure the IFM, and then later allocate the same VLAN.
Workaround: Unconfigure, and then reconfigure the IFM on the port.
- When you configure vlan dot1q tag native globally on Supervisor Engine 6-E, MST control packets are tagged on egress on the native VLAN. This conflicts with 802.1s. The Cisco 7600 Series router drops its MST proposal agreements (because it expects the native VLAN MST control packets to be untagged), causing 30 seconds of traffic loss while spanning tree converges.
Workaround: Disable native VLAN tagging on the trunk port of the switch by entering the
no switchport trunk native vlan tag command. CSCsz12611
- Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:
Workaround: No functional impact.
You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063
- If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.
Workaround: Reduce the number of VLAN mappings. CSCtn56208
- WCCP service is not reacquired when a service group with a multicast group address is unconfigured, and then reconfigured.
Workaround: Configure IP multicast routing globally and establish IP PIM sparse dense mode on the CE-facing interface. CSCtl97692
- If an interface whose IP address is being used as the router ID is deleted or shuts down, and you configure a service group with a multicast group address, packet redirection to CE stops and packets are forwarded directly to the destination.
Workaround: Unconfigure and reconfigure the service group. CSCtn88087
- Global WCCP service configuration fails to enable (WCCP global configuration is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.
Workaround: Enable a Layer 3 interface in the running configuration. CSCsc88636.
– Links flap for various Layer 3 protocols.
– A traffic loss of several seconds occurs during the upgrade process.
Workaround: Do not use the quick option with the issu changeversion command.
- In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.
Workaround: Enter the show platform software interface Gix/xx statistic command.
Resolved Caveats in Cisco IOS Release 15.0(2)SG5
This section lists the resolved caveats in Release 15.0(2)SG5:
- On a switch running Cisco IOS Release 15.0(2)SG4 or 15.1(1)SG using 4648* or 4748* PoE linecards with connected devices that link flap frequently, a single port on a linecard fails to link up.
Workaround: Enter shut then no shut the port to restore connectivity. CSCtz94862
- On a switch running Cisco IOS Release 15.0(2)SG4 or 15.1(1)SG using 4648* or 4748* linecards with PoE, a PoE device will not power up on a single port whereas it works on a different port on the same switch.
– Enter shut then no shut on the port. CSCua63562
- If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.
Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212
Open Caveats for Cisco IOS Release 15.0(2)SG4
This section lists the open caveats for Cisco IOS Release 15.0(2)SG4:
- When you enter the ip http secure-server command (or if the system reads it from the startup configuration), the device searches for a persistent self-signed certificate during boot up.
– If such a certificate does not exist and the device's hostname and default_domain are set, then a persistent self-signed certificate is generated.
– If such a certificate exists, the FQDN in the certificate is compared with the current device's hostname and default_domain. If either differs from the FQDN in the certificate, the existing persistent self-signed certificate is replaced with a new one with the updated FQDN. Be aware that the existing key pair is used in the new certificate.
On a switch that supports redundancy, the generation of the self-signed certificate occurs independently on the active and the standby supervisor engines, and the certificates differ. After switchover, the HTTP client that holds the old certificate cannot connect to the HTTPS server.
Workaround: Reconnect. CSCsb11964
- When policing IEEE 802.1Q tagged non-IP traffic and calculating traffic conformance, the policer excludes the four bytes that constitute the 802.1Q tag even when you enter the
qos account layer2 encapsulation command.
- When hard-coded duplex and speed settings are deleted after an interface shuts down, an a- is added to the duplex and speed in the output from the show interface status command.
This does not affect performance.
Workaround: Enter the no shutdown command. CSCsg27395
- When a transceiver is removed rapidly from one port and placed in another on the same chassis, occasionally a duplicate seeprom message appears and the port is not able to handle traffic.
Workaround: Remove the transceiver from the new port and place it in the old port. After the SFP is recognized in the old port, remove it slowly and insert it in the new port. (CSCse34693)
- When performing an ISSU upgrade and the versions of the active and standby supervisor engines differ, you see the following message in the standby supervisor engine console:
Workaround: None. This is an informational message. CSCsi60898
Workarounds: Do one of the following:
– After a reload, copy the startup-config to the running-config.
– Use a loopback interface as the target of the ip unnumbered command.
– Change the CLI configuration so that during bootup the router port is created first.
- In SSO mode, when a port channel is created, deleted, and recreated on an active supervisor engine with the same channel number, the standby port channel state goes out of sync. After a switch over, the following message displays:
Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the port channel, create a new channel. CSCsr00333
- VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, you will not see the VLAN updates on the other switches in the VTP domain.
Workaround: Configure an ISL/dot1q trunk port. CSCsu43445
- When you remove a line card containing ports configured with IGMP snooping while booting a standby supervisor engine, the active supervisor engine does not synchronize this configuration to the standby supervisor engine as a part of a bulk synchronization. When you reinstall the line card, the configuration in the active and standby supervisor engines will differ.
Workaround: Do one of the following:
– Reload the standby switch again with the line card in place.
– Remove and reenter the commands on the active supervisor engine. The standby supervisor engine will acquire this change. CSCsv44866
- After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:
This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG
- The host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.
If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.
Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661
- If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
show policy-map interface command are wrong.
The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149
- On a wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.
This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.
Workaround: Use the VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS.
The IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored.
- On a Layer 2 port (that is, a switchport) of Supervisor Engine II+ thru V-10GE, the
|auto qos voice trust command auto generates qos trust cos configuration, in addition to other parameters. However, when the port is converted from Layer 2 to Layer 3 with the no switchport command, the qos trust dscp command should be generated.
Workaround: When interface mode is changed from Layer2 to Layer3, manually change interface trust state by enter the cos trust dscp command. CSCta16492
- When you run Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, or later releases and configure switchport block multicast on a switch, Layer 2 multicast is not blocked. IPv4 and IPV6 unknown multicast traffic is blocked.
Prior to Cisco IOS Release 12.2(53)SG1 and 12.2(50)SG6, the switchport block multicast command blocks IP Multicast, Layer 2 multicast, and broadcast traffic. CSCta61825
- If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for a Catalyst 4900M switch, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.
Despite the different default value, you can configure any value in the time range.
- On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.
Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677
- After you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.
Similarly, the show epm sessions command always displays the authentication method as DOT1X.
Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157
- With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.
- When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.
Workaround: Configure both dead-criteria and deadtime.
- When spanning tree is changed from PVST to Rapid PVST, and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.
Workaround: Enter shut, and then no shut on the ports. CSCtn88228
- If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.
Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437
- A device in a Guest VLAN that is connected behind a phone capable of 2nd-port-TLV, experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you reboot a switch, the configured value of the interface MTU size on the members of the port channel interface does not function for IPv6 traffic.
Workaround: After the switch reloads, enter shut, and then no shut on the port channel interface.
- If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.
- When you have two Layer 3 CE-facing interfaces, each connected to a CE to split WCCP between the CEs, and you move a WCCP service (such as 60 (ftp-native)) from one interface to the other, the target interface fails to completely transfer the service from the old to the new CE.
Workaround: Shut down the CE-facing interface. After all of the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941
- Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.
Workaround: Remove these operators from any dynamic ACLs. CSCts05302
- Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.
- If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.
Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.
Workaround: Retain the trunk native V LAN as 1. CSCud05521
- If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.
Workaround: Return a dACL in the authorization profile with successful guest authentication.
- If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:
– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.
– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.
If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.
Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646
- If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.
Not Supported on Supervisor Engine 6-E
Supervisor Engine 6-E and Supervisor Engine 6L-E Specific Caveats
- Occasionally, if you use an X2 SR transceiver on a WS-X4706-10GE running
Cisco IOS Release 12.2(40)SG, you observe CRC errors after a reload or power cycle upon inserting the card or X2.
Workaround: Reinsert the X2. CSCsk43618
- If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.
Workaround: Enter the show policy-map interface command to find the actual burst value programmed. CSCsi71036
- When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.
If you enter the show policy-map name, however, the unconditional marking actions appear. CSCsi94144
- Supervisor Engine II-Plus-TS in a Catalyst 4503-E chassis running ROMMON lists the chassis type as Unknown. After booting Cisco IOS, the chassis type is listed properly.
- Uplinks go down when you upgrade the ROMMON of an WS-X45-SUP6-E supervisor from version 0.34 to a later version.
This behavior occurs in a redundant switch when the active supervisor engine is running Cisco IOS, the standby supervisor engine is in ROMMON, and the standby supervisor engine’s ROMMON is upgraded from version 0.34 or to a later version. The upgrade process causes the uplinks on the standby supervisor engine to go down but the active supervisor engine is unaware of this.
Workarounds: To resume normal operation, do one of the following:
– Reload both supervisor engines with the redundancy reload shelf command.
– Power-cycle the standby supervisor engine by briefly pulling it from the chassis.
There is no workaround for the link flap issue. CSCsm81875
This problem can happen when pause frames are sent to a switch port and the flow control receive configuration is toggled on a 10-Gigabit Ethernet port.
Workaround: Change the flow control receive configuration when no traffic exists. CSCso71647
- If an EtherChannel is a member of a FlexLink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (FlexLink failure).
- When a CFM Inward Facing MEP (IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
IFM CC Status as inactive. When you allocate the VLAN, the CC-status remains inactive.
You only see this behavior if you initially did not allocate a VLAN before you configure the IFM, and then later allocate the same VLAN.
Workaround: Unconfigure, and then reconfigure the IFM on the port.
- When you configure vlan dot1q tag native globally on Supervisor Engine 6-E, MST control packets are tagged on egress on the native VLAN. This conflicts with 802.1s. The Cisco 7600 Series router drops its MST proposal agreements (because it expects the native VLAN MST control packets to be untagged), causing 30 seconds of traffic loss while spanning tree converges.
Workaround: Disable native VLAN tagging on the trunk port of the switch by entering the
no switchport trunk native vlan tag command. CSCsz12611
- Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:
Workaround: No functional impact.
You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063
- If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.
Workaround: Reduce the number of VLAN mappings. CSCtn56208
- WCCP service is not reacquired when a service group with a multicast group address is unconfigured, and then reconfigured.
Workaround: Configure IP multicast routing globally and establish IP PIM sparse dense mode on the CE-facing interface. CSCtl97692
- If an interface whose IP address is being used as the router ID is deleted or shuts down, and you configure a service group with a multicast group address, packet redirection to CE stops and packets are forwarded directly to the destination.
Workaround: Unconfigure and reconfigure the service group. CSCtn88087
- Global WCCP service configuration fails to enable (WCCP global configuration is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.
Workaround: Enable a Layer 3 interface in the running configuration. CSCsc88636.
– Links flap for various Layer 3 protocols.
– A traffic loss of several seconds occurs during the upgrade process.
Workaround: Do not use the quick option with the issu changeversion command.
- On a switch running Cisco IOS Release 15.0(2)SG4 or 15.1(1)SG using 4648* or 4748* PoE linecards with connected devices that link flap frequently, a single port on a linecard fails to link up.
Workaround: Enter shut then no shut the port to restore connectivity. CSCtz94862
- On a switch running Cisco IOS Release 15.0(2)SG4 or 15.1(1)SG using 4648* or 4748* linecards with PoE, a PoE device will not power up on a single port whereas it works on a different port on the same switch.
– Enter shut then no shut on the port. CSCua63562
- In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.
Workaround: Enter the show platform software interface Gix/xx statistic command.
Resolved Caveats in Cisco IOS Release 15.0(2)SG4
This section lists the resolved caveats in Release 15.0(2)SG4:
- If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.
Workaround: Clear the MAC address. CSCtn24046
- After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.
Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125
- A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:
The occurs under the following conditions:
– Multi-auth (or multi-host) and MAB dot1x are configured on a port.
– A voice VLAN is not configured on the port.
– The device authenticates through 802.1X.
– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.
– A dynamic VLAN is assigned to the port following 802.1X authorization.
– Enter shut then no shut on the port to halt the high CPU and log messages.
– Enter the switchport voice vlan command on the port. CSCtw73754
- If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.
Open Caveats for Cisco IOS Release 15.0(2)SG3
This section lists the open caveats for Cisco IOS Release 15.0(2)SG3:
- When you enter the ip http secure-server command (or if the system reads it from the startup configuration), the device searches for a persistent self-signed certificate during boot up.
– If such a certificate does not exist and the device's hostname and default_domain are set, then a persistent self-signed certificate is generated.
– If such a certificate exists, the FQDN in the certificate is compared with the current device's hostname and default_domain. If either differs from the FQDN in the certificate, the existing persistent self-signed certificate is replaced with a new one with the updated FQDN. Be aware that the existing key pair is used in the new certificate.
On a switch that supports redundancy, the generation of the self-signed certificate occurs independently on the active and the standby supervisor engines, and the certificates differ. After switchover, the HTTP client that holds the old certificate cannot connect to the HTTPS server.
Workaround: Reconnect. CSCsb11964
- When policing IEEE 802.1Q tagged non-IP traffic and calculating traffic conformance, the policer excludes the four bytes that constitute the 802.1Q tag even when you enter the
qos account layer2 encapsulation command.
- When hard-coded duplex and speed settings are deleted after an interface shuts down, an a- is added to the duplex and speed in the output from the show interface status command.
This does not affect performance.
Workaround: Enter the no shutdown command. CSCsg27395
- When a transceiver is removed rapidly from one port and placed in another on the same chassis, occasionally a duplicate seeprom message appears and the port is not able to handle traffic.
Workaround: Remove the transceiver from the new port and place it in the old port. After the SFP is recognized in the old port, remove it slowly and insert it in the new port. (CSCse34693)
- When performing an ISSU upgrade and the versions of the active and standby supervisor engines differ, you see the following message in the standby supervisor engine console:
Workaround: None. This is an informational message. CSCsi60898
Workarounds: Do one of the following:
– After a reload, copy the startup-config to the running-config.
– Use a loopback interface as the target of the ip unnumbered command.
– Change the CLI configuration so that during bootup the router port is created first.
- In SSO mode, when a port channel is created, deleted, and recreated on an active supervisor engine with the same channel number, the standby port channel state goes out of sync. After a switch over, the following message displays:
Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the port channel, create a new channel. CSCsr00333
- VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, you will not see the VLAN updates on the other switches in the VTP domain.
Workaround: Configure an ISL/dot1q trunk port. CSCsu43445
- When you remove a line card containing ports configured with IGMP snooping while booting a standby supervisor engine, the active supervisor engine does not synchronize this configuration to the standby supervisor engine as a part of a bulk synchronization. When you reinstall the line card, the configuration in the active and standby supervisor engines will differ.
Workaround: Do one of the following:
– Reload the standby switch again with the line card in place.
– Remove and reenter the commands on the active supervisor engine. The standby supervisor engine will acquire this change. CSCsv44866
- After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:
This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG
- The host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.
If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.
Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661
- If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
show policy-map interface command are wrong.
The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149
- On a wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.
This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.
Workaround: Use the VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS.
The IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored.
- On a Layer 2 port (that is, a switchport) of Supervisor Engine II+ thru V-10GE, the
|auto qos voice trust command auto generates qos trust cos configuration, in addition to other parameters. However, when the port is converted from Layer 2 to Layer 3 with the no switchport command, the qos trust dscp command should be generated.
Workaround: When interface mode is changed from Layer2 to Layer3, manually change interface trust state by enter the cos trust dscp command. CSCta16492
- When you run Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, or later releases and configure switchport block multicast on a switch, Layer 2 multicast is not blocked. IPv4 and IPV6 unknown multicast traffic is blocked.
Prior to Cisco IOS Release 12.2(53)SG1 and 12.2(50)SG6, the switchport block multicast command blocks IP Multicast, Layer 2 multicast, and broadcast traffic. CSCta61825
- If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for a Catalyst 4900M switch, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.
Despite the different default value, you can configure any value in the time range.
- On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.
Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677
- After you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.
Similarly, the show epm sessions command always displays the authentication method as DOT1X.
Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157
- With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.
- When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.
Workaround: Configure both dead-criteria and deadtime.
- When spanning tree is changed from PVST to Rapid PVST, and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.
Workaround: Enter shut, and then no shut on the ports. CSCtn88228
- If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.
Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437
- A device in a Guest VLAN that is connected behind a phone capable of 2nd-port-TLV, experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you reboot a switch, the configured value of the interface MTU size on the members of the port channel interface does not function for IPv6 traffic.
Workaround: After the switch reloads, enter shut, and then no shut on the port channel interface.
- If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.
- When you have two Layer 3 CE-facing interfaces, each connected to a CE to split WCCP between the CEs, and you move a WCCP service (such as 60 (ftp-native)) from one interface to the other, the target interface fails to completely transfer the service from the old to the new CE.
Workaround: Shut down the CE-facing interface. After all of the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941
- Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.
Workaround: Remove these operators from any dynamic ACLs. CSCts05302
- After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.
Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125
- A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:
The occurs under the following conditions:
– Multi-auth (or multi-host) and MAB dot1x are configured on a port.
– A voice VLAN is not configured on the port.
– The device authenticates through 802.1X.
– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.
– A dynamic VLAN is assigned to the port following 802.1X authorization.
– Enter shut then no shut on the port to halt the high CPU and log messages.
– Enter the switchport voice vlan command on the port. CSCtw73754
- If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.
- After a few hours of operation, during which DHCP is enabled and sessions receive DHCP information from a RADIUS server, a Cisco ASR router running as an LNS box crashes with DHCP related errors.
- Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.
- If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.
Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.
Workaround: Retain the trunk native V LAN as 1. CSCud05521
- If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.
Workaround: Return a dACL in the authorization profile with successful guest authentication.
- If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:
– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.
– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.
If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.
Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646
- If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.
Not Supported on Supervisor Engine 6-E
Supervisor Engine 6-E and Supervisor Engine 6L-E Specific Caveats
- Occasionally, if you use an X2 SR transceiver on a WS-X4706-10GE running
Cisco IOS Release 12.2(40)SG, you observe CRC errors after a reload or power cycle upon inserting the card or X2.
Workaround: Reinsert the X2. CSCsk43618
- If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.
Workaround: Enter the show policy-map interface command to find the actual burst value programmed. CSCsi71036
- When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.
If you enter the show policy-map name, however, the unconditional marking actions appear. CSCsi94144
- Supervisor Engine II-Plus-TS in a Catalyst 4503-E chassis running ROMMON lists the chassis type as Unknown. After booting Cisco IOS, the chassis type is listed properly.
- Uplinks go down when you upgrade the ROMMON of an WS-X45-SUP6-E supervisor from version 0.34 to a later version.
This behavior occurs in a redundant switch when the active supervisor engine is running Cisco IOS, the standby supervisor engine is in ROMMON, and the standby supervisor engine’s ROMMON is upgraded from version 0.34 or to a later version. The upgrade process causes the uplinks on the standby supervisor engine to go down but the active supervisor engine is unaware of this.
Workarounds: To resume normal operation, do one of the following:
– Reload both supervisor engines with the redundancy reload shelf command.
– Power-cycle the standby supervisor engine by briefly pulling it from the chassis.
There is no workaround for the link flap issue. CSCsm81875
This problem can happen when pause frames are sent to a switch port and the flow control receive configuration is toggled on a 10-Gigabit Ethernet port.
Workaround: Change the flow control receive configuration when no traffic exists. CSCso71647
- If an EtherChannel is a member of a FlexLink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (FlexLink failure).
- When a CFM Inward Facing MEP (IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
IFM CC Status as inactive. When you allocate the VLAN, the CC-status remains inactive.
You only see this behavior if you initially did not allocate a VLAN before you configure the IFM, and then later allocate the same VLAN.
Workaround: Unconfigure, and then reconfigure the IFM on the port.
- When you configure vlan dot1q tag native globally on Supervisor Engine 6-E, MST control packets are tagged on egress on the native VLAN. This conflicts with 802.1s. The Cisco 7600 Series router drops its MST proposal agreements (because it expects the native VLAN MST control packets to be untagged), causing 30 seconds of traffic loss while spanning tree converges.
Workaround: Disable native VLAN tagging on the trunk port of the switch by entering the
no switchport trunk native vlan tag command. CSCsz12611
- Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:
Workaround: No functional impact.
You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063
- If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.
Workaround: Reduce the number of VLAN mappings. CSCtn56208
- WCCP service is not reacquired when a service group with a multicast group address is unconfigured, and then reconfigured.
Workaround: Configure IP multicast routing globally and establish IP PIM sparse dense mode on the CE-facing interface. CSCtl97692
- If an interface whose IP address is being used as the router ID is deleted or shuts down, and you configure a service group with a multicast group address, packet redirection to CE stops and packets are forwarded directly to the destination.
Workaround: Unconfigure and reconfigure the service group. CSCtn88087
- Global WCCP service configuration fails to enable (WCCP global configuration is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.
Workaround: Enable a Layer 3 interface in the running configuration. CSCsc88636.
– Links flap for various Layer 3 protocols.
– A traffic loss of several seconds occurs during the upgrade process.
Workaround: Do not use the quick option with the issu changeversion command.
- If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.
Workaround: Clear the MAC address. CSCtn24046
- In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.
Workaround: Enter the show platform software interface Gix/xx statistic command.
Resolved Caveats in Cisco IOS Release 15.0(2)SG3
This section lists the resolved caveats in Release 15.0(2)SG3:
- When only an RX fiber is broken on a 10-Gigabit Ethernet link in a REP ring, REP segment convergence might require more than 500 ms.
Only WS-C4900M uplink ports (Te1/1-8), WS-X45-SUP6L-E uplink ports, and WS-X4904-10GE are affected.
Workaround: Use a non-affected module for REP ports such as WS-X4908-10GE. CSCtr76579
- A vulnerability in the Multicast Source Discovery Protocol (MSDP) implementation of Cisco IOS Software and Cisco IOS XE Software could allow a remote, unauthenticated attacker to cause a reload of an affected device. Repeated attempts to exploit this vulnerability could result in a sustained denial of service (DoS) condition.
Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-msdp
Note The March 28, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the March 2012 bundled publication.
Individual publication links are in ''Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication'' at the following link:
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html
- A vulnerability exists in the Cisco IOS Software that may allow a remote application or device to exceed its authorization level when authentication, authorization, and accounting (AAA) authorization is used. This vulnerability requires that the HTTP or HTTPS server is enabled on the Cisco IOS device.
Products that are not running Cisco IOS Software are not vulnerable.
Cisco has released free software updates that address these vulnerabilities.
The HTTP server may be disabled as a workaround for the vulnerability described in this advisory.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-pai
Open Caveats for Cisco IOS Release 15.0(2)SG2
This section lists the open caveats for Cisco IOS Release 15.0(2)SG2:
- When you enter the ip http secure-server command (or if the system reads it from the startup configuration), the device searches for a persistent self-signed certificate during boot up.
– If such a certificate does not exist and the device's hostname and default_domain are set, then a persistent self-signed certificate is generated.
– If such a certificate exists, the FQDN in the certificate is compared with the current device's hostname and default_domain. If either differs from the FQDN in the certificate, the existing persistent self-signed certificate is replaced with a new one with the updated FQDN. Be aware that the existing key pair is used in the new certificate.
On a switch that supports redundancy, the generation of the self-signed certificate occurs independently on the active and the standby supervisor engines, and the certificates differ. After switchover, the HTTP client that holds the old certificate cannot connect to the HTTPS server.
Workaround: Reconnect. CSCsb11964
- When policing IEEE 802.1Q tagged non-IP traffic and calculating traffic conformance, the policer excludes the four bytes that constitute the 802.1Q tag even when you enter the
qos account layer2 encapsulation command.
- When hard-coded duplex and speed settings are deleted after an interface shuts down, an a- is added to the duplex and speed in the output from the show interface status command.
This does not affect performance.
Workaround: Enter the no shutdown command. CSCsg27395
- When a transceiver is removed rapidly from one port and placed in another on the same chassis, occasionally a duplicate seeprom message appears and the port is not able to handle traffic.
Workaround: Remove the transceiver from the new port and place it in the old port. After the SFP is recognized in the old port, remove it slowly and insert it in the new port. (CSCse34693)
- When performing an ISSU upgrade and the versions of the active and standby supervisor engines differ, you see the following message in the standby supervisor engine console:
Workaround: None. This is an informational message. CSCsi60898
Workarounds: Do one of the following:
– After a reload, copy the startup-config to the running-config.
– Use a loopback interface as the target of the ip unnumbered command.
– Change the CLI configuration so that during bootup the router port is created first.
- In SSO mode, when a port channel is created, deleted, and recreated on an active supervisor engine with the same channel number, the standby port channel state goes out of sync. After a switch over, the following message displays:
Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the port channel, create a new channel. CSCsr00333
- VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, you will not see the VLAN updates on the other switches in the VTP domain.
Workaround: Configure an ISL/dot1q trunk port. CSCsu43445
- When you remove a line card containing ports configured with IGMP snooping while booting a standby supervisor engine, the active supervisor engine does not synchronize this configuration to the standby supervisor engine as a part of a bulk synchronization. When you reinstall the line card, the configuration in the active and standby supervisor engines will differ.
Workaround: Do one of the following:
– Reload the standby switch again with the line card in place.
– Remove and reenter the commands on the active supervisor engine. The standby supervisor engine will acquire this change. CSCsv44866
- After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:
This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG
- The host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.
If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.
Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661
- If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
show policy-map interface command are wrong.
The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149
- On a wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.
This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.
Workaround: Use the VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS.
The IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored.
- On a Layer 2 port (that is, a switchport) of Supervisor Engine II+ thru V-10GE, the
|auto qos voice trust command auto generates qos trust cos configuration, in addition to other parameters. However, when the port is converted from Layer 2 to Layer 3 with the no switchport command, the qos trust dscp command should be generated.
Workaround: When interface mode is changed from Layer2 to Layer3, manually change interface trust state by enter the cos trust dscp command. CSCta16492
- When you run Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, or later releases and configure switchport block multicast on a switch, Layer 2 multicast is not blocked. IPv4 and IPV6 unknown multicast traffic is blocked.
Prior to Cisco IOS Release 12.2(53)SG1 and 12.2(50)SG6, the switchport block multicast command blocks IP Multicast, Layer 2 multicast, and broadcast traffic. CSCta61825
- If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for a Catalyst 4900M switch, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.
Despite the different default value, you can configure any value in the time range.
- On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.
Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677
- After you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.
Similarly, the show epm sessions command always displays the authentication method as DOT1X.
Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157
- With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.
- When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.
Workaround: Configure both dead-criteria and deadtime.
- When spanning tree is changed from PVST to Rapid PVST, and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.
Workaround: Enter shut, and then no shut on the ports. CSCtn88228
- If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.
Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437
- A device in a Guest VLAN that is connected behind a phone capable of 2nd-port-TLV, experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you reboot a switch, the configured value of the interface MTU size on the members of the port channel interface does not function for IPv6 traffic.
Workaround: After the switch reloads, enter shut, and then no shut on the port channel interface.
- If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.
- When you have two Layer 3 CE-facing interfaces, each connected to a CE to split WCCP between the CEs, and you move a WCCP service (such as 60 (ftp-native)) from one interface to the other, the target interface fails to completely transfer the service from the old to the new CE.
Workaround: Shut down the CE-facing interface. After all of the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941
- Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.
Workaround: Remove these operators from any dynamic ACLs. CSCts05302
- After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.
Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125
- A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:
The occurs under the following conditions:
– Multi-auth (or multi-host) and MAB dot1x are configured on a port.
– A voice VLAN is not configured on the port.
– The device authenticates through 802.1X.
– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.
– A dynamic VLAN is assigned to the port following 802.1X authorization.
– Enter shut then no shut on the port to halt the high CPU and log messages.
– Enter the switchport voice vlan command on the port. CSCtw73754
- If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.
- After a few hours of operation, during which DHCP is enabled and sessions receive DHCP information from a RADIUS server, a Cisco ASR router running as an LNS box crashes with DHCP related errors.
- Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.
- If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.
Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.
Workaround: Retain the trunk native V LAN as 1. CSCud05521
- If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.
Workaround: Return a dACL in the authorization profile with successful guest authentication.
- If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:
– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.
– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.
If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.
Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646
- If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.
Not Supported on Supervisor Engine 6-E
Supervisor Engine 6-E and Supervisor Engine 6L-E Specific Caveats
- Occasionally, if you use an X2 SR transceiver on a WS-X4706-10GE running
Cisco IOS Release 12.2(40)SG, you observe CRC errors after a reload or power cycle upon inserting the card or X2.
Workaround: Reinsert the X2. CSCsk43618
- If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.
Workaround: Enter the show policy-map interface command to find the actual burst value programmed. CSCsi71036
- When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.
If you enter the show policy-map name, however, the unconditional marking actions appear. CSCsi94144
- Supervisor Engine II-Plus-TS in a Catalyst 4503-E chassis running ROMMON lists the chassis type as Unknown. After booting Cisco IOS, the chassis type is listed properly.
- Uplinks go down when you upgrade the ROMMON of an WS-X45-SUP6-E supervisor from version 0.34 to a later version.
This behavior occurs in a redundant switch when the active supervisor engine is running Cisco IOS, the standby supervisor engine is in ROMMON, and the standby supervisor engine’s ROMMON is upgraded from version 0.34 or to a later version. The upgrade process causes the uplinks on the standby supervisor engine to go down but the active supervisor engine is unaware of this.
Workarounds: To resume normal operation, do one of the following:
– Reload both supervisor engines with the redundancy reload shelf command.
– Power-cycle the standby supervisor engine by briefly pulling it from the chassis.
There is no workaround for the link flap issue. CSCsm81875
This problem can happen when pause frames are sent to a switch port and the flow control receive configuration is toggled on a 10-Gigabit Ethernet port.
Workaround: Change the flow control receive configuration when no traffic exists. CSCso71647
- If an EtherChannel is a member of a FlexLink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (FlexLink failure).
- When a CFM Inward Facing MEP (IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
IFM CC Status as inactive. When you allocate the VLAN, the CC-status remains inactive.
You only see this behavior if you initially did not allocate a VLAN before you configure the IFM, and then later allocate the same VLAN.
Workaround: Unconfigure, and then reconfigure the IFM on the port.
- When you configure vlan dot1q tag native globally on Supervisor Engine 6-E, MST control packets are tagged on egress on the native VLAN. This conflicts with 802.1s. The Cisco 7600 Series router drops its MST proposal agreements (because it expects the native VLAN MST control packets to be untagged), causing 30 seconds of traffic loss while spanning tree converges.
Workaround: Disable native VLAN tagging on the trunk port of the switch by entering the
no switchport trunk native vlan tag command. CSCsz12611
- Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:
Workaround: No functional impact.
You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063
- If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.
Workaround: Reduce the number of VLAN mappings. CSCtn56208
- WCCP service is not reacquired when a service group with a multicast group address is unconfigured, and then reconfigured.
Workaround: Configure IP multicast routing globally and establish IP PIM sparse dense mode on the CE-facing interface. CSCtl97692
- If an interface whose IP address is being used as the router ID is deleted or shuts down, and you configure a service group with a multicast group address, packet redirection to CE stops and packets are forwarded directly to the destination.
Workaround: Unconfigure and reconfigure the service group. CSCtn88087
- Global WCCP service configuration fails to enable (WCCP global configuration is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.
Workaround: Enable a Layer 3 interface in the running configuration. CSCsc88636.
– Links flap for various Layer 3 protocols.
– A traffic loss of several seconds occurs during the upgrade process.
Workaround: Do not use the quick option with the issu changeversion command. CSCto51562
- When only an RX fiber is broken on a 10-Gigabit Ethernet link in a REP ring, REP segment convergence might require more than 500 ms.
Only WS-C4900M uplink ports (Te1/1-8), WS-X45-SUP6L-E uplink ports, and WS-X4904-10GE are affected.
Workaround: Use a non-affected module for REP ports such as WS-X4908-10GE. CSCtr76579
- If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.
Workaround: Clear the MAC address. CSCtn24046
- In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.
Workaround: Enter the show platform software interface Gix/xx statistic command.
Resolved Caveats in Cisco IOS Release 15.0(2)SG2
This section lists the resolved caveats in Release 15.0(2)SG2:
- If Flex link load balancing is configured on a PVLAN flex link pair and some VLANs prefer the backup interface in the pair, entering shut and then no shut on the backup flex link interface causes high cpu from SA miss events. This happens because dynamic mac address learning is broken.
The primary flex link interface comes up correctly.
Workaround: Configure static MAC address for the MAC address that must be learned dynamically on the backup flex link interface. CSCtr40070
- When configuring, removing, and reapplying IP SLA configuration (reapply without the history filter) and querying the rttmonhistory tree, a Catalyst4 948-10GE switch will fail.
- When a switch is configured for MAC Authentication Bypass (MAB) EAP and the AAA server requests EAP-TLS (as the EAP method) first, MAB fails.
– Configure the switch port for mab rather than mab eap.
– Configure the AAA server to propose EAP-MD5 first rather than EAP-TLS for MAB EAP requests. CSCti78674
- Layer 2 multicast is not switched egress with a port-channel interface after a member link or port-channel flaps.
1. Delete, then add the affected VLAN with no vlan vlan_ID, then lan vlan_ID.
2. Flap the impacted port-channel with shutdown, then no shutdown. CSCtr17251
- Typically, when a switch crashes, the crashinfo file is empty. Occasionally, the following text is present:
Workaround: Attach the console to collect additional crash data. CSCtu05426
Workaround: Re-enter the rep preempt segment command. CSCtr89862
- A vulnerability in the Multicast Source Discovery Protocol (MSDP) implementation of Cisco IOS Software and Cisco IOS XE Software could allow a remote, unauthenticated attacker to cause a reload of an affected device. Repeated attempts to exploit this vulnerability could result in a sustained denial of service (DoS) condition.
Cisco has released free software updates that address this vulnerability. Workarounds that mitigate this vulnerability are available. This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-msdp
Note The March 28, 2012, Cisco IOS Software Security Advisory bundled publication includes nine Cisco Security Advisories. Each advisory lists the Cisco IOS Software releases that correct the vulnerability or vulnerabilities detailed in the advisory as well as the Cisco IOS Software releases that correct all vulnerabilities in the March 2012 bundled publication.
Individual publication links are in ''Cisco Event Response: Semiannual Cisco IOS Software Security Advisory Bundled Publication'' at the following link:
http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_mar12.html
- A vulnerability exists in the Cisco IOS Software that may allow a remote application or device to exceed its authorization level when authentication, authorization, and accounting (AAA) authorization is used. This vulnerability requires that the HTTP or HTTPS server is enabled on the Cisco IOS device.
Products that are not running Cisco IOS Software are not vulnerable.
Cisco has released free software updates that address these vulnerabilities.
The HTTP server may be disabled as a workaround for the vulnerability described in this advisory.
This advisory is available at the following link:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20120328-pai
Open Caveats for Cisco IOS Release 15.0(2)SG1
This section lists the open caveats for Cisco IOS Release 15.0(2)SG1:
- When you enter the ip http secure-server command (or if the system reads it from the startup configuration), the device searches for a persistent self-signed certificate during boot up.
– If such a certificate does not exist and the device's hostname and default_domain are set, then a persistent self-signed certificate is generated.
– If such a certificate exists, the FQDN in the certificate is compared with the current device's hostname and default_domain. If either differs from the FQDN in the certificate, the existing persistent self-signed certificate is replaced with a new one with the updated FQDN. Be aware that the existing key pair is used in the new certificate.
On a switch that supports redundancy, the generation of the self-signed certificate occurs independently on the active and the standby supervisor engines, and the certificates differ. After switchover, the HTTP client that holds the old certificate cannot connect to the HTTPS server.
Workaround: Reconnect. CSCsb11964
- When policing IEEE 802.1Q tagged non-IP traffic and calculating traffic conformance, the policer excludes the four bytes that constitute the 802.1Q tag even when you enter the
qos account layer2 encapsulation command.
- When hard-coded duplex and speed settings are deleted after an interface shuts down, an a- is added to the duplex and speed in the output from the show interface status command.
This does not affect performance.
Workaround: Enter the no shutdown command. CSCsg27395
- When a transceiver is removed rapidly from one port and placed in another on the same chassis, occasionally a duplicate seeprom message appears and the port is not able to handle traffic.
Workaround: Remove the transceiver from the new port and place it in the old port. After the SFP is recognized in the old port, remove it slowly and insert it in the new port. (CSCse34693)
- When performing an ISSU upgrade and the versions of the active and standby supervisor engines differ, you see the following message in the standby supervisor engine console:
Workaround: None. This is an informational message. CSCsi60898
Workarounds: Do one of the following:
– After a reload, copy the startup-config to the running-config.
– Use a loopback interface as the target of the ip unnumbered command.
– Change the CLI configuration so that during bootup the router port is created first.
- In SSO mode, when a port channel is created, deleted, and recreated on an active supervisor engine with the same channel number, the standby port channel state goes out of sync. After a switch over, the following message displays:
Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the port channel, create a new channel. CSCsr00333
- VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, you will not see the VLAN updates on the other switches in the VTP domain.
Workaround: Configure an ISL/dot1q trunk port. CSCsu43445
- When you remove a line card containing ports configured with IGMP snooping while booting a standby supervisor engine, the active supervisor engine does not synchronize this configuration to the standby supervisor engine as a part of a bulk synchronization. When you reinstall the line card, the configuration in the active and standby supervisor engines will differ.
Workaround: Do one of the following:
– Reload the standby switch again with the line card in place.
– Remove and reenter the commands on the active supervisor engine. The standby supervisor engine will acquire this change. CSCsv44866
- After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:
This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG
- The host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.
If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.
Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661
- If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
show policy-map interface command are wrong.
The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149
- On a wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.
This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.
Workaround: Use the VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS.
The IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored.
- On a Layer 2 port (that is, a switchport) of Supervisor Engine II+ thru V-10GE, the
|auto qos voice trust command auto generates qos trust cos configuration, in addition to other parameters. However, when the port is converted from Layer 2 to Layer 3 with the no switchport command, the qos trust dscp command should be generated.
Workaround: When interface mode is changed from Layer2 to Layer3, manually change interface trust state by enter the cos trust dscp command. CSCta16492
- When you run Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, or later releases and configure switchport block multicast on a switch, Layer 2 multicast is not blocked. IPv4 and IPV6 unknown multicast traffic is blocked.
Prior to Cisco IOS Release 12.2(53)SG1 and 12.2(50)SG6, the switchport block multicast command blocks IP Multicast, Layer 2 multicast, and broadcast traffic. CSCta61825
- If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for a Catalyst 4900M switch, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.
Despite the different default value, you can configure any value in the time range.
- On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.
Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677
- After you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.
Similarly, the show epm sessions command always displays the authentication method as DOT1X.
Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157
- With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.
- When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.
Workaround: Configure both dead-criteria and deadtime.
- When spanning tree is changed from PVST to Rapid PVST, and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.
Workaround: Enter shut, and then no shut on the ports. CSCtn88228
- If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.
Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437
- A device in a Guest VLAN that is connected behind a phone capable of 2nd-port-TLV, experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you reboot a switch, the configured value of the interface MTU size on the members of the port channel interface does not function for IPv6 traffic.
Workaround: After the switch reloads, enter shut, and then no shut on the port channel interface.
- If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.
- When you have two Layer 3 CE-facing interfaces, each connected to a CE to split WCCP between the CEs, and you move a WCCP service (such as 60 (ftp-native)) from one interface to the other, the target interface fails to completely transfer the service from the old to the new CE.
Workaround: Shut down the CE-facing interface. After all of the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941
- If Flex link load balancing is configured on a PVLAN flex link pair and some VLANs prefer the backup interface in the pair, entering shut and then no shut on the backup flex link interface causes high cpu from SA miss events. This happens because dynamic mac address learning is broken.
The primary flex link interface comes up correctly.
Workaround: Configure static MAC address for the MAC address that must be learned dynamically on the backup flex link interface. CSCtr40070
- Dynamic ACLs do not function correctly if they include advanced operators, including dscp/ipp/tos, log/log-input, fragments and/or tcp flag operators.
Workaround: Remove these operators from any dynamic ACLs. CSCts05302
- When a switch is configured for MAC Authentication Bypass (MAB) EAP and the AAA server requests EAP-TLS (as the EAP method) first, MAB fails.
– Configure the switch port for mab rather than mab eap.
– Configure the AAA server to propose EAP-MD5 first rather than EAP-TLS for MAB EAP requests. CSCti78674
- Layer 2 multicast is not switched egress with a port-channel interface after a member link or port-channel flaps.
1. Delete, then add the affected VLAN with no vlan vlan_ID, then lan vlan_ID.
2. Flap the impacted port-channel with shutdown, then no shutdown. CSCtr17251
Workaround: Re-enter the rep preempt segment command. CSCtr89862
- After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.
Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125
- A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:
The occurs under the following conditions:
– Multi-auth (or multi-host) and MAB dot1x are configured on a port.
– A voice VLAN is not configured on the port.
– The device authenticates through 802.1X.
– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.
– A dynamic VLAN is assigned to the port following 802.1X authorization.
– Enter shut then no shut on the port to halt the high CPU and log messages.
– Enter the switchport voice vlan command on the port. CSCtw73754
- If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.
- After a few hours of operation, during which DHCP is enabled and sessions receive DHCP information from a RADIUS server, a Cisco ASR router running as an LNS box crashes with DHCP related errors.
- Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.
- If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.
Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.
Workaround: Retain the trunk native V LAN as 1. CSCud05521
- If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.
Workaround: Return a dACL in the authorization profile with successful guest authentication.
- If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:
– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.
– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.
If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.
Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646
- If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.
Not Supported on Supervisor Engine 6-E
- During an ISSU upgrade or downgrade from v122_31_sg_throttle to v122_46_sg_throttle, the following error message displays on the console of the active supervisor engine:
- When configuring, removing, and reapplying IP SLA configuration (reapply without the history filter) and querying the rttmonhistory tree, a Catalyst4 948-10GE switch will fail.
- Typically, when a switch crashes, the crashinfo file is empty. Occasionally, the following text is present:
Workaround: Attach the console to collect additional crash data. CSCtu05426
Supervisor Engine 6-E and Supervisor Engine 6L-E Specific Caveats
- Occasionally, if you use an X2 SR transceiver on a WS-X4706-10GE running
Cisco IOS Release 12.2(40)SG, you observe CRC errors after a reload or power cycle upon inserting the card or X2.
Workaround: Reinsert the X2. CSCsk43618
- If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.
Workaround: Enter the show policy-map interface command to find the actual burst value programmed. CSCsi71036
- When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.
If you enter the show policy-map name, however, the unconditional marking actions appear. CSCsi94144
- Supervisor Engine II-Plus-TS in a Catalyst 4503-E chassis running ROMMON lists the chassis type as Unknown. After booting Cisco IOS, the chassis type is listed properly.
- Uplinks go down when you upgrade the ROMMON of an WS-X45-SUP6-E supervisor from version 0.34 to a later version.
This behavior occurs in a redundant switch when the active supervisor engine is running Cisco IOS, the standby supervisor engine is in ROMMON, and the standby supervisor engine’s ROMMON is upgraded from version 0.34 or to a later version. The upgrade process causes the uplinks on the standby supervisor engine to go down but the active supervisor engine is unaware of this.
Workarounds: To resume normal operation, do one of the following:
– Reload both supervisor engines with the redundancy reload shelf command.
– Power-cycle the standby supervisor engine by briefly pulling it from the chassis.
There is no workaround for the link flap issue. CSCsm81875
This problem can happen when pause frames are sent to a switch port and the flow control receive configuration is toggled on a 10-Gigabit Ethernet port.
Workaround: Change the flow control receive configuration when no traffic exists. CSCso71647
- If an EtherChannel is a member of a FlexLink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (FlexLink failure).
- When a CFM Inward Facing MEP (IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
IFM CC Status as inactive. When you allocate the VLAN, the CC-status remains inactive.
You only see this behavior if you initially did not allocate a VLAN before you configure the IFM, and then later allocate the same VLAN.
Workaround: Unconfigure, and then reconfigure the IFM on the port.
- When you configure vlan dot1q tag native globally on Supervisor Engine 6-E, MST control packets are tagged on egress on the native VLAN. This conflicts with 802.1s. The Cisco 7600 Series router drops its MST proposal agreements (because it expects the native VLAN MST control packets to be untagged), causing 30 seconds of traffic loss while spanning tree converges.
Workaround: Disable native VLAN tagging on the trunk port of the switch by entering the
no switchport trunk native vlan tag command. CSCsz12611
- Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:
Workaround: No functional impact.
You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063
- If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.
Workaround: Reduce the number of VLAN mappings. CSCtn56208
- WCCP service is not reacquired when a service group with a multicast group address is unconfigured, and then reconfigured.
Workaround: Configure IP multicast routing globally and establish IP PIM sparse dense mode on the CE-facing interface. CSCtl97692
- If an interface whose IP address is being used as the router ID is deleted or shuts down, and you configure a service group with a multicast group address, packet redirection to CE stops and packets are forwarded directly to the destination.
Workaround: Unconfigure and reconfigure the service group. CSCtn88087
- Global WCCP service configuration fails to enable (WCCP global configuration is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.
Workaround: Enable a Layer 3 interface in the running configuration. CSCsc88636.
– Links flap for various Layer 3 protocols.
– A traffic loss of several seconds occurs during the upgrade process.
Workaround: Do not use the quick option with the issu changeversion command. CSCto51562
- When only an RX fiber is broken on a 10-Gigabit Ethernet link in a REP ring, REP segment convergence might require more than 500 ms.
Only WS-C4900M uplink ports (Te1/1-8), WS-X45-SUP6L-E uplink ports, and WS-X4904-10GE are affected.
Workaround: Use a non-affected module for REP ports such as WS-X4908-10GE. CSCtr76579
- If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.
Workaround: Clear the MAC address. CSCtn24046
- In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.
Workaround: Enter the show platform software interface Gix/xx statistic command.
Resolved Caveats in Cisco IOS Release 15.0(2)SG1
This section lists the resolved caveats in Release 15.0(2)SG1:
- If you use MDA or multi-auth host mode with authentication open, the switch ignores unicast EAPOL responses.
– Force the supplicant to use multicast EAPOL.
– Do not use authentication open mode.
- Class-map hit counters do not increment on the egress policy-map when it is attached to the primary VLAN on a PVLAN trunk ports. However, the traffic is properly classified and the actions configured in the policy are applied properly.
- When Fallback WebAuth and Multi-host are configured on a port and no PACL exists, permit ip any any is installed in the TCAM and all traffic from the host is allowed to pass.
Workaround: Configure an ACL on the port. CSCte18760
- After a session falls back to Web Authentication, and no port ACL or fallback ACL is configured, Auth_Default_ACL is programmed infrequently.
Workaround: Configure a port ACL on the interface. CSCtl89389
- A switch configured for epm open directive in multi-authentication configuration fails when authentication sessions are cleared.
Workaround: Do not configure open directive on the switch.
- When reconnecting to a switch using device tracking, a Windows Vista, 2008, or 2007 device registers a duplicate address message. A Windows Vista, 2008, or 2007 client probes for a tentative IP address while the switch probes for device status. This duplicate address register issue is usually triggered by disconnecting or reconnecting.
Workaround: Disable gratuitous ARP on the Windows device. CSCtn27420
- If you create a new IPv6 ACL, delete a permit ACE, and then re-add the permit ACE, the sh run | b ipv6 access-list command displays unexpected commands on the IPv6 access list configuration.
In this output, sequence 40 is the unexpected command that appears in front of the entry.
Workaround: Delete the access list and reconfigure all entries, rather than deleting or reconfiguring the access list. CSCtn83348
Workaround: Enter the interface range command to configure all member ports to use a new port channel that is created automatically. CSCtn52362
Workaround: Enter shut, and then no shut on the member port. CSCtn52404
Workaround: Add the following permit ACEs to the ACL:
- If you use IGMP reports with groups like 226.0.0.2, 225.0.0.2, or 225.128.0.2, HSRP hello packets drop and HSRP peers are down. This happens because HSRP hello packets are sent to MAC address 224.0.0.2, which overlaps with the IGMP group addresses just mentioed.
Workaround: None. Use a different IGMP group address. CSCtq15982
- The list of VLANs defined by the vlan-range command used for configuring per-VLAN QoS is too long, causing the system to reject the command and display the following log:
Workaround: Remove the logging filter. CSCto76709
- Memory leak is observed in the RADIUS and EAP framework processes. The output of the show mem all totals command displays the name of the leaked memory as AAA Attr String and AAA Attr List.
- When QoS commands are applied line by line on PVLAN isolated trunks, the policer is not applied and line rate traffic exits the port.
Workaround: Cut and paste the configuration. Then apply rapidly to PVLAN isolated trunk port. CSCtq04058
- When the active port set to the egress policy is single, you cannot modify the multicast control packets (like HSRP/OSPF) IP ToS field.
- When a connected data device behind a phone disconnects from a port configured for multi-auth host mode, a new session for the device is restarted even though the device is absent.
The CDP TLV generated to indicate that a data device has disconnected is ignored. This is done to avoid disconnecting other connected data clients, if any. (Refer to CSCta47293.)
Workarounds: Enter either of the following commands:
– clear authentication session interface
– authentication timer inactivity
- A host IP is not inserted into a URL redirect ACL unless the host IP is already in the device tracking table (DHCP snooping or IPDT).
- If Filter ID or fallback ACLs are currently applied to a port, and you modify them, they will not be programmed correctly in hardware.
Workaround: Modify filter ID or fallback ACLs only when they are not in use. CSCto79274
Open Caveats for Cisco IOS Release 15.0(2)SG
This section lists the open caveats for Cisco IOS Release 15.0(2)SG:
- When you enter the ip http secure-server command (or if the system reads it from the startup configuration), the device searches for a persistent self-signed certificate during boot up.
– If such a certificate does not exist and the device's hostname and default_domain are set, then a persistent self-signed certificate is generated.
– If such a certificate exists, the FQDN in the certificate is compared with the current device's hostname and default_domain. If either differs from the FQDN in the certificate, the existing persistent self-signed certificate is replaced with a new one with the updated FQDN. Be aware that the existing key pair is used in the new certificate.
On a switch that supports redundancy, the generation of the self-signed certificate occurs independently on the active and the standby supervisor engines, and the certificates differ. After switchover, the HTTP client that holds the old certificate cannot connect to the HTTPS server.
Workaround: Reconnect. CSCsb11964
- When policing IEEE 802.1Q tagged non-IP traffic and calculating traffic conformance, the policer excludes the four bytes that constitute the 802.1Q tag even when you enter the
qos account layer2 encapsulation command.
- When hard-coded duplex and speed settings are deleted after an interface shuts down, an a- is added to the duplex and speed in the output from the show interface status command.
This does not affect performance.
Workaround: Enter the no shutdown command. CSCsg27395
- When a transceiver is removed rapidly from one port and placed in another on the same chassis, occasionally a duplicate seeprom message appears and the port is not able to handle traffic.
Workaround: Remove the transceiver from the new port and place it in the old port. After the SFP is recognized in the old port, remove it slowly and insert it in the new port. CSCse34693
- When performing an ISSU upgrade and the versions of the active and standby supervisor engines differ, you see the following message in the standby supervisor engine console:
Workaround: None. This is an informational message. (CSCsi60898)
Workarounds: Do one of the following:
– After a reload, copy the startup-config to the running-config.
– Use a loopback interface as the target of the ip unnumbered command.
– Change the CLI configuration so that during bootup the router port is created first.
- In SSO mode, when a port channel is created, deleted, and recreated on an active supervisor engine with the same channel number, the standby port channel state goes out of sync. After a switch over, the following message displays:
Workaround: When the port channel starts to flap, enter shut and no shut on the port channel. After the first switchover and after deleting the port channel, create a new channel. CSCsr00333
- VTP databases do not propagate through promiscuous trunk ports. If only promiscuous trunks are configured, you will not see the VLAN updates on the other switches in the VTP domain.
Workaround: Configure an ISL/dot1q trunk port. CSCsu43445
- When you remove a line card containing ports configured with IGMP snooping while booting a standby supervisor engine, the active supervisor engine does not synchronize this configuration to the standby supervisor engine as a part of a bulk synchronization. When you reinstall the line card, the configuration in the active and standby supervisor engines will differ.
Workaround: Do one of the following:
– Reload the standby switch again with the line card in place.
– Remove and reenter the commands on the active supervisor engine. The standby supervisor engine will acquire this change. CSCsv44866
- After posture validation succeeds, the following benign traceback messages may appear after you unconfigure the global RADIUS and IP device tracking commands:
This applies to classic or E-series Catalyst 4500 supervisor engines running
Cisco IOS Release 12.2(50)SG
- The host's MAC address is not synchronized to the standby supervisor engine after you unconfigure 802.1X on the port and reconnect the host to a IP phone (with CDP port status TLV support) that is connected to the switch.
If the switch were to run a supervisor switchover while in this state, the host's MAC address would not be present in the new active supervisor engine’s MAC address table, causing possible connectivity interruption on the host.
Workaround: Enter the shutdown command, followed by the no shutdown command on the interface. This triggers relearning and synchronizing of the host's MAC to the standby supervisor engine. CSCsw91661
- Class-map hit counters do not increment on the egress policy-map when it is attached to the primary VLAN on a PVLAN trunk ports. However, the traffic is properly classified and the actions configured in the policy are applied properly.
- If you simultaneously apply a service-policy to a port in the output direction and a service-policy to a vlan-range under that port in the output direction, the class-map hit counters in the output of the
show policy-map interface command are wrong.
The queue transmit counters as well as the policing statistics (if any) are correct. CSCsz20149
- On a wireless control system (WCS), some device information is incorrectly displayed for PCs sitting behind an lldp-med capable phone. Specifically, WCS displays the phone's serial number, model number, and software version in the PC's device information. All other information about the PC is correctly displayed on WCS.
This only happens when the switch is running network mobility service protocol (nmsp). It does not happen if the phone is CDP enabled.
Workaround: Use the VLAN ID or name to differentiate the IP phone and the PC sitting behind the phone on the WCS.
The IP phone is detected on the voice VLAN, and the displayed information of serial number, model number, and software version is correct. However, a PC sitting behind the phone is detected on a data VLAN, and the displayed device information is wrong and should be ignored.
- On a Layer 2 port (that is, a switchport) of Supervisor Engine II+ thru V-10GE, the
|auto qos voice trust command auto generates qos trust cos configuration, in addition to other parameters. However, when the port is converted from Layer 2 to Layer 3 with the no switchport command, the qos trust dscp command should be generated.
Workaround: When interface mode is changed from Layer2 to Layer3, manually change interface trust state by enter the cos trust dscp command. CSCta16492
- When you run Cisco IOS Release 12.2(53)SG1, 12.2(50)SG6, or later releases and configure switchport block multicast on a switch, Layer 2 multicast is not blocked. IPv4 and IPV6 unknown multicast traffic is blocked.
Prior to Cisco IOS Release 12.2(53)SG1 and 12.2(50)SG6, the switchport block multicast command blocks IP Multicast, Layer 2 multicast, and broadcast traffic. CSCta61825
- If time is not specified in the link debounce command, the default value depends on the supervisor engine. The default is 10 mS for a Catalyst 4900M switch, Supervisor Engine 6-E, and Supervisor Engine 6L-E. The default is 100 mS for all other supervisor engines.
Despite the different default value, you can configure any value in the time range.
- On a peer interface on a Catalyst 4948E Ethernet Switch, if errdisabled mode flap detection is set to a very small number (such as 2 flaps in 10 sec), a 10GE link flap may cause the peer interface to enter the errdisabled state.
Workarounds: The Cisco switch default link-flap detection value is 5 flaps in 10 seconds. Use the default value or larger numbers. CSCtg07677
- When a connected data device behind a phone disconnects from a port configured for multi-auth host mode, a new session for the device is restarted even though the device is absent.
The CDP TLV generated to indicate that a data device has disconnected is ignored. This is done to avoid disconnecting other connected data clients, if any. (Refer to CSCta47293.)
Workarounds: Enter either of the following commands:
– clear authentication session interface
– authentication timer inactivity
- When Fallback WebAuth and Multi-host are configured on a port and no PACL exists, permit ip any any is installed in the TCAM and all traffic from the host is allowed to pass.
Workaround: Configure an ACL on the port. CSCte18760
- After you have enabled EPM logging and the client is authenticated via MAB or Webauth, the value of AUTHTYPE is DOT1X in EPM syslog messages irrespective of the authentication method.
Similarly, the show epm sessions command always displays the authentication method as DOT1X.
Workaround: To view the authentication method used for a client, enter the
show authentication sessions command. CSCsx42157
- With CFM enabled globally as well as on an ingress interface, CFM packets received on the interface are not policed with hardware control plane policing.
- When either the RADIUS-server test feature or RADIUS-erver dead-criteria is configured and either RADIUS-server deadtime is not configured or is set to 0, the RADIUS-server status is not properly relayed to AAA.
Workaround: Configure both dead-criteria and deadtime.
- After a session falls back to Web Authentication, and no port ACL or fallback ACL is configured, Auth_Default_ACL is programmed infrequently.
Workaround: Configure a port ACL on the interface. CSCtl89389
- When spanning tree is changed from PVST to Rapid PVST, and you enter the show spanning-tree vlan command, the ports configured as promiscuous trunks are not listed as part of the spanning tree.
Workaround: Enter shut, and then no shut on the ports. CSCtn88228
- If you configure Open Authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. The issue interrupts traffic only after the second switchover, because after the initial switchover the new standby supervisor engine possesses the wrong state, and the second switchover will start the port in the blocking state.
Workaround: Enter shut, and then no shut on the port to synchronize the STP state. CSCtf52437
- A device in a Guest VLAN that is connected behind a phone capable of 2nd-port-TLV, experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- A host IP is not inserted into a URL redirect ACL unless the host IP is already in the device tracking table (DHCP snooping or IPDT).
- A switch configured for epm open directive in multi-authentication configuration fails when authentication sessions are cleared.
Workaround: Do not configure open directive on the switch.
- When reconnecting to a switch using device tracking, a Windows Vista, 2008, or 2007 device registers a duplicate address message. A Windows Vista, 2008, or 2007 client probes for a tentative IP address while the switch probes for device status. This duplicate address register issue is usually triggered by disconnecting or reconnecting.
Workaround: Disable gratuitous ARP on the Windows device. CSCtn27420
- If you reboot a switch, the configured value of the interface MTU size on the members of the port channel interface does not function for IPv6 traffic.
Workaround: After the switch reloads, enter shut, and then no shut on the port channel interface.
- If you enter the clear ip mroute ? command, only the vrf option is displayed. The Hostname and ' * ' options are not displayed, although they are accepted by the system, and the clear ip mroute command functions as expected.
- If you create a new IPv6 ACL, delete a permit ACE, and then re-add the permit ACE, the sh run | b ipv6 access-list command displays unexpected commands on the IPv6 access list configuration.
In this output, sequence 40 is the unexpected command that appears in front of the entry.
Workaround: Delete the access list and reconfigure all entries, rather than deleting or reconfiguring the access list. CSCtn83348
- When you have two Layer 3 CE-facing interfaces, each connected to a CE to split WCCP between the CEs, and you move a WCCP service (such as 60 (ftp-native)) from one interface to the other, the target interface fails to completely transfer the service from the old to the new CE.
Workaround: Shut down the CE-facing interface. After all of the mask-value entries point to the target CE, unshut the CE-facing interface. CSCtl09941
Workaround: Enter the interface range command to configure all member ports to use a new port channel that is created automatically. CSCtn52362
Workaround: Enter shut, and then no shut on the member port. CSCtn52404
- If Filter ID or fallback ACLs are currently applied to a port, and you modify them, they will not be programmed correctly in hardware.
Workaround: Modify filter ID or fallback ACLs only when they are not in use. CSCto79274
- When configuring, removing, and reapplying IP SLA configuration (reapply without the history filter) and querying the rttmonhistory tree, a Catalyst4 948-10GE switch will fail.
- Layer 2 multicast is not switched egress with a port-channel interface after a member link or port-channel flaps.
1. Delete, then add the affected VLAN with no vlan vlan_ID, then lan vlan_ID.
2. Flap the impacted port-channel with shutdown, then no shutdown. CSCtr17251
- If Flex link load balancing is configured on a PVLAN flex link pair and some VLANs prefer the backup interface in the pair, entering shut and then no shut on the backup flex link interface causes high cpu from SA miss events. This happens because dynamic mac address learning is broken.
The primary flex link interface comes up correctly.
Workaround: Configure static MAC address for the MAC address that must be learned dynamically on the backup flex link interface. CSCtr40070
Workaround: Re-enter the rep preempt segment command. CSCtr89862
- When a switch is configured for MAC Authentication Bypass (MAB) EAP and the AAA server requests EAP-TLS (as the EAP method) first, MAB fails.
– Configure the switch port for mab rather than mab eap.
– Configure the AAA server to propose EAP-MD5 first rather than EAP-TLS for MAB EAP requests. CSCti78674
- After a switch reestablishes a lost connection with AAA servers configured for broadcast accounting, the switch crashes.
Workaround: Do not use the broadcast keyword in the aaa accounting configuration. CSCts56125
- A switch configured with 802.1X might shows considerable CPU usage by the 802.1X switch process and displays the following message:
The occurs under the following conditions:
– Multi-auth (or multi-host) and MAB dot1x are configured on a port.
– A voice VLAN is not configured on the port.
– The device authenticates through 802.1X.
– The connected device sends no traffic, falls over to MAB, and then successfully authenticates through 802.1X.
– A dynamic VLAN is assigned to the port following 802.1X authorization.
– Enter shut then no shut on the port to halt the high CPU and log messages.
– Enter the switchport voice vlan command on the port. CSCtw73754
- If PoE linecards are present and you enter either the show power inline module x or show power inline module x detail command, very rarely the supervisor engine might crash.
- After a few hours of operation, during which DHCP is enabled and sessions receive DHCP information from a RADIUS server, a Cisco ASR router running as an LNS box crashes with DHCP related errors.
- Configuring an interface as uni-directional with the unidirectional send-only | receive-only command still allows the interface to send (configured as “Send-only Unidirection Ethernet mode”) or receive (configured as "Receive-only Unidirection Ethernet mode") packets in a bi-directional mode.
- If a switch is configured with the aaa accounting send stop-record authentication failure command, and MAB fails on the port and subsequent attempts are made to authorize the device after the restart timer expires, a high level of memory usage due to the "MAB Framework" process is observed.
Workaround: Unconfigure the following from the switch: aaa accounting send stop-record authentication failure. CSCtj69212
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to a non-default value, REP packets are not sent on the native VLAN.
Workaround: Retain the trunk native V LAN as 1. CSCud05521
- If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL is incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- redirect-url and redirect-acl are not cleared after a successful CoA, causing the final step of Central Web Authentication to fail.
Workaround: Return a dACL in the authorization profile with successful guest authentication.
- If URL redirect is installed as part of authorization and either of the following occurs, memory will leak:
– A fast stream of traffic matches the URL redirect ACL as IPDT clears an address.
– A traffic stream matches the URL redirect ACL and no URL redirect policy is installed for that IP address.
If memory leak occurs repeatedly, IPDT and other control packet processing ultimately ceases.
Workaround: If this behavior completely fills the CPU buffer, the switch must be reloaded. However, the frequency of encountering a stuck queue can be reduced to nearly zero by modifying the URL redirect ACL to permit only 80/443 traffic. CSCug56646
- If a device is authenticating while the RADIUS server goes down, the port connected to the device may enter the err-disabled state.
Not Supported on Supervisor Engine 6-E
- During an ISSU upgrade or downgrade from v122_31_sg_throttle to v122_46_sg_throttle, the following error message displays on the console of the active supervisor engine:
- Typically, when a switch crashes, the crashinfo file is empty. Occasionally, the following text is present:
Workaround: Attach the console to collect additional crash data. CSCtu05426
Supervisor Engine 6-E and Supervisor Engine 6L-E Specific Caveats
- Occasionally, if you use an X2 SR transceiver on a WS-X4706-10GE running
Cisco IOS Release 12.2(40)SG, you observe CRC errors after a reload or power cycle upon inserting the card or X2.
Workaround: Reinsert the X2. (CSCsk43618)
- If burst is not explicitly configured for a single rate policer, the show policy-map command displays an incorrect burst value.
Workaround: Enter the show policy-map interface command to find the actual burst value programmed. CSCsi71036
- When you enter the show policy-map vlan vlan command, unconditional marking actions that are configured on the VLAN are not shown.
If you enter the show policy-map name, however, the unconditional marking actions appear. CSCsi94144
- Supervisor Engine II-Plus-TS in a Catalyst 4503-E chassis running ROMMON lists the chassis type as Unknown. After booting Cisco IOS, the chassis type is listed properly.
- Uplinks go down when you upgrade the ROMMON of an WS-X45-SUP6-E supervisor from version 0.34 to a later version.
This behavior occurs in a redundant switch when the active supervisor engine is running Cisco IOS, the standby supervisor engine is in ROMMON, and the standby supervisor engine’s ROMMON is upgraded from version 0.34 or to a later version. The upgrade process causes the uplinks on the standby supervisor engine to go down but the active supervisor engine is unaware of this.
Workarounds: To resume normal operation, do one of the following:
– Reload both supervisor engines with the redundancy reload shelf command.
– Power-cycle the standby supervisor engine by briefly pulling it from the chassis.
There is no workaround for the link flap issue. CSCsm81875
This problem can happen when pause frames are sent to a switch port and the flow control receive configuration is toggled on a 10-Gigabit Ethernet port.
Workaround: Change the flow control receive configuration when no traffic exists. CSCso71647
- If an EtherChannel is a member of a FlexLink pair, then static MAC addresses configured on the EtherChannel are not moved to the alternate port when the EtherChannel fails (FlexLink failure).
- When a CFM Inward Facing MEP (IFM) is configured on a VLAN that is not allocated on a switch port that is DOWN, the show ethernet cfm maintenance-points local command displays the
IFM CC Status as inactive. When you allocate the VLAN, the CC-status remains inactive.
You only see this behavior if you initially did not allocate a VLAN before you configure the IFM, and then later allocate the same VLAN.
Workaround: Unconfigure, and then reconfigure the IFM on the port.
- When you configure vlan dot1q tag native globally on Supervisor Engine 6-E, MST control packets are tagged on egress on the native VLAN. This conflicts with 802.1s. The Cisco 7600 Series router drops its MST proposal agreements (because it expects the native VLAN MST control packets to be untagged), causing 30 seconds of traffic loss while spanning tree converges.
Workaround: Disable native VLAN tagging on the trunk port of the switch by entering the
no switchport trunk native vlan tag command. CSCsz12611
- Before large PACLs are fully loaded in hardware, you might observe a false completion messages like the following:
Workaround: No functional impact.
You must wait for the ACLs to be programmed before performing other TCAM related changes. CSCtd57063
- RA Guard counters are not incremented in the output of the show ipv6 first-hop counters interface command when Router Advertisement and Router Redirect packets with Destination address FF02::x are dropped.
Workaround: Add the following permit ACEs to the ACL:
- If a port has joined a port channel, you cannot modify a VLAN map configuration of an EtherChannel member port.
Workaround: Shut the member port. CSCtn49832
- If a large number of VLAN mappings are configured, a member port might fail to join a port channel and no warming is issued.
Workaround: Reduce the number of VLAN mappings. CSCtn56208
- WCCP service is not reacquired when a service group with a multicast group address is unconfigured, and then reconfigured.
Workaround: Configure IP multicast routing globally and establish IP PIM sparse dense mode on the CE-facing interface. CSCtl97692
- If an interface whose IP address is being used as the router ID is deleted or shuts down, and you configure a service group with a multicast group address, packet redirection to CE stops and packets are forwarded directly to the destination.
Workaround: Unconfigure and reconfigure the service group. CSCtn88087
- Global WCCP service configuration fails to enable (WCCP global configuration is accepted but nvgen fails) on a newly deployed switch if the switch is not enabled for SVI or a Layer 3 interface.
Workaround: Enable a Layer 3 interface in the running configuration. CSCsc88636.
– Links flap for various Layer 3 protocols.
– A traffic loss of several seconds occurs during the upgrade process.
Workaround: Do not use the quick option with the issu changeversion command. CSCto51562
- When only an RX fiber is broken on a 10-Gigabit Ethernet link in a REP ring, REP segment convergence might require more than 500 ms.
Only WS-C4900M uplink ports (Te1/1-8), WS-X45-SUP6L-E uplink ports, and WS-X4904-10GE are affected.
Workaround: Use a non-affected module for REP ports such as WS-X4908-10GE. CSCtr76579
- If two clients are authenticated by MAB on a multi-host port, when the first client moves to a different port using MAC Move, the second host is not authenticated; it remains in the running state.
Workaround: Clear the MAC address. CSCtn24046
- In the output of the show interface command, output counters for an EtherChannel member remain zero provided the ports are flapped from a peer and the switch is either Catalyst 4900M, Catalyst 4948E, or 4948E-F, or the supervisor engine is either 6E or 6L-E.
Workaround: Enter the show platform software interface Gix/xx statistic command.
Resolved Caveats in Cisco IOS Release 15.0(2)SG
This section lists the resolved caveats in Release 15.0(2)SG:
- If you reconfigure VLAN load balancing to reflect different blocking ports, when VLAN load balancing is progressing, manual preemption does not occur.
Workaround: Reconfigure VLAN load balancing with a different configuration, by performing the following task:
a. Reconfigure the VLAN load balancing configuration on the desired REP ports.
b. Use the shut command on any one REP port in the segment to cause a failure in that segment.
c. Use the no shut command on the same port to restore normal REP topology with one ALT port.
d. Invoke manual preemption on a primary edge port to obtain VLAN load balancing with the new configuration.
- When you remove an SFP+ from a OneX converter in a X2 slot, the system requires approximately 45 seconds to recognize this action. During this interval, all commands reflect that the SFP+ is still present. Reinserting the SFP+ in another port or inserting another SFP+ in the same port can cause the “duplicate seeprom” error message to appear.
Workaround: When a log message appears indicating that the SFP+ has been removed, do one of the following:
– Enter any commands for that port.
– Insert an SFP+ in that port.
– Reinsert the removed SFP+ in another port. CSCsv90044
- If you disable and reenable IGMP snooping on a VLAN, the output of the show mac address command does not associate the term “Switch” with the multicast entry. Multicast traffic is not impacted.
Workaround: Enter shut, and then no shut on the SVI. CSCtg72559
- If an X2 or SFP is in an inactive uplink port on a Supervisor Engine V-10GE, Supervisor II+10GE, Supervisor 6-E, or Supervisor 6-LE, it might cause threshold violations to be reported once every 10 minutes.
Workaround: Remove the X2 or SFP from the port. CSCth08212
- If host mode multidomain is configured, after a successful authorization, neither the data device nor the IP phone will pass traffic.
- A switch might fail while loading BGP routes if the ip cef accounting non-recursive command is already configured.
Workaround: Disable the ip cef accounting non-recursive command. CSCtn68186
- When CX1 or SFP+ is plugged into a OneX converter (CVR-X2-SFP10G) in a WS-X4908-10GE, the switch requires 1 minute to boot the link.
- A switch fails when attaching a service policy to a target, if the service policy contains more than 56 classes and each class is associated with an explicit marking action. For example:
Workaround: Use tablemap-based marking. CSC99836
- When you reload an adjoining Catalyst 3400 switch connected to two Catalyst 4500 Series switches in a REP ring topology, the REP alternate port does not block any traffic.
Workaround: Enter shut, and then no shut on the alternate port. CSCtn26322
- If a redirect ACL is installed on multiple ports using cisco-av-pair url-redirect-acl=ACLNAME and the ACL is modified, the EPM MAIN process reports elevated CPU usage.
- A nonsupplicant PC is connected to an 802.1x port in MDA mode. Upon no response to EAPOL, the PC is placed in a Guest VLAN (correct behavior). If the supplicant is enabled on the PC and the credentials are entered, the switch reports AUTHC success and AUTHZ fail. If the client reattempts 802.1x before the port returns to the Guest VLAN, this process succeeds.
- When a configuration file has VTP mode off and is copied to the running configuration, the VLANs that are not already in the VLAN database are not created.
– Create the VLANs manually. CSCtl94096
- After reloading and rebooting one of the switches in a REP ring topology, the alternate port forwards traffic and causes a loop.
Workaround: Enter shut, and then no shut on the alternate interface. CSCtn03533
- If VLAN load balancing is enabled, after the primary Flex Link goes down and then recovers, a Catalyst 4500 switch sends out multicast frames when the preemption timer expires. The switch sends out one additional unicast frame after it sends out the Flex Link multicast frames, causing the secondary core to learn the MAC address on an incorrect port.
- LACP ports between a Catalyst 4500 switch and a Nexus switch enter suspended mode when the native VLAN is tagged and changed to x on both chassis (native VLAN is not 1).
- LLDP frames are tagged incorrectly when leaving an 802.1q port if the native VLAN has a value other than 1.
Workaround: Use the default native VLAN (VLAN of 1) for the trunks. CSCtn29321
- Some non-powered devices fail to linkup when connected to a 4648-RJ45-E/+E or 4748-RJ45+E line card port with a two-pair/4-wire cable (1,2,3,6).
This behavior is observed when you use IBM Cable Systems Type 1A/2A or any two-pair cable, including Cat5e.
Troubleshooting
These sections provide troubleshooting guidelines for the Catalyst 4000 family running IOS supervisor engines:
- Netbooting from the ROMMON
- Troubleshooting at the System Level
- Troubleshooting Modules
- Troubleshooting MIBs
Netbooting from the ROMMON
Netbooting using a boot loader image is not supported. Instead, use one of the following options to boot an image:
1. Boot from a CompactFlash card by entering the following command:
The ROMMON TFTP boot is very similar to the BOOTLDR TFTP boot, except that:
– the BOOTLDR variable should not be set
– the TFTP server must be accessible from the Ethernet management port on the supervisor engine.
To boot from ROMMON, perform the following tasks while in ROMMON mode:
a. Ensure that the Ethernet management port on the supervisor engine is physically connected to the network.
b. Verify that bootloader environment is not set by entering the unset bootldr command.
c. Set IP address of the Ethernet management port on the supervisor engine by entering the following command: set interface fa1 ip_address > < ip_mask
For example, to set the supervisor engine Ethernet port with an IP address 172.16.1.5 and IP mask 255.255.255.0, enter the following command:
d. Set default gateway for the Ethernet management port on the supervisor engine by entering the following command: set ip route default gateway_ip_address. The default gateway should be directly connected to the supervisor engine Ethernet management port subnet.
e. Ping the TFTP server to ensure that there is connectivity to the server from the Ethernet management port on the supervisor engine by entering the following command: ping < tftp_server_ip_address >.
f. Once the ping is successful, boot the image from the TFTP server by entering the following command: boot tftp:// tftp_server_ip_address > / < image_path_and_file_name
For example, to boot the image name cat4000-is-mz.160 located on the TFTP server 172.16.1.8, enter the following command:
Troubleshooting at the System Level
This section contains troubleshooting guidelines for system-level problems:
- When the system is booting and running power-on diagnostics, do not reset the switch.
- Ensure that you do not mix the serial and Ethernet cables plugged into the supervisor engine. The Fast Ethernet port (10/100 MGT) on the supervisor engine is inoperative in all Catalyst 4500 Cisco IOS releases. An Ethernet cable plugged into the Fast Ethernet port is active only in ROMMON mode.
Troubleshooting Modules
This section contains troubleshooting guidelines for modules:
- When you hot insert a module into a chassis, always use the ejector levers on the front of the module to seat the backplane pins properly. Inserting a module without using the ejector levers might cause the supervisor engine to display incorrect messages about the module. For module installation instructions, refer to the Catalyst 4500 Series Module Installation Guide.
- Whenever you connect an interface that has duplex set to autonegotiate to an end station or another networking device, ensure that the other device is configured for autonegotiation as well. If the other device is not set to autonegotiate, the port set to autonegotiate will remain in half-duplex mode, which can cause a duplex mismatch resulting in packet loss, late collisions, and line errors on the link.
Troubleshooting MIBs
For general information on MIBs, RMON groups, and traps, refer to the Cisco public MIB directory ( http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml). For information on the specific MIBs supported by the Catalyst 4500 series switches, refer to the Catalyst 4000 MIB Support List located at ftp://ftp.cisco.com/pub/mibs/supportlists/cat4000/cat4000-supportlist.html.
Related Documentation
Although their Release Notes are unique, the 4 platforms (Catalyst 4500, Catalyst 4900, Catalyst ME 4900, and Catalyst 4900M) use the same Software Configuration Guide, Command Reference Guide, and System Message Guide. Refer to the following home pages for additional information:
http://www.cisco.com/go/cat4500/docs
http://www.cisco.com/go/cat4900/docs
http://www.cisco.com/en/US/products/ps7009/tsd_products_support_series_home.html
Hardware Documents
Installation guides and notes including specifications and relevant safety information are available at the following URLs:
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/installation/guide/78-14409-08/4500inst.html
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/catalyst4500e/installation/guide/Eseries.html
- For information about individual switching modules and supervisors, refer to the Catalyst 4500 Series Module Installation Guide at:
http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_installation_guides_list.html
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/hardware/regulatory/compliance/78_13233.html
http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_installation_guides_list.html
http://www.cisco.com/en/US/products/ps6021/prod_installation_guides_list.html
http://www.cisco.com/en/US/products/ps7009/prod_installation_guides_list.html
Software Documentation
Software release notes, configuration guides, command references, and system message guides are available at the following URLs:
http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_release_notes_list.html
http://www.cisco.com/en/US/products/ps6021/prod_release_notes_list.html
http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/release/note/OL_11511.html
Software documents for the Catalyst 4500 Classic, Catalyst 4500 E-Series, Catalyst 4900, and
Cisco ME 4900 Series Ethernet Switches are available at the following URLs:
http://www.cisco.com/en/US/products/hw/switches/ps4324/products_installation_and_configuration_guides_list.html
http://www.cisco.com/en/US/products/hw/switches/ps4324/prod_command_reference_list.html
http://www.cisco.com/en/US/products/hw/switches/ps4324/products_system_message_guides_list.html
Cisco IOS Documentation
Platform-independent Cisco IOS documentation may also apply to the Catalyst 4500 and 4900 switches. These documents are available at the following URLs:
http://www.cisco.com/en/US/products/ps6350/products_installation_and_configuration_guides_list.html
http://www.cisco.com/en/US/products/ps6350/prod_command_reference_list.html
You can also use the Command Lookup Tool at:
http://tools.cisco.com/Support/CLILookup/cltSearchAction.do
http://www.cisco.com/en/US/products/ps6350/products_system_message_guides_list.html
You can also use the Error Message Decoder tool at:
http://www.cisco.com/pcgi-bin/Support/Errordecoder/index.cgi
http://www.cisco.com/public/sw-center/netmgmt/cmtk/mibs.shtml
Notices
The following notices pertain to this software license.
OpenSSL/Open SSL Project
This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit ( http://www.openssl.org/).
This product includes cryptographic software written by Eric Young (eay@cryptsoft.com).
This product includes software written by Tim Hudson (tjh@cryptsoft.com).
License Issues
The OpenSSL toolkit stays under a dual license, i.e. both the conditions of the OpenSSL License and the original SSLeay license apply to the toolkit. See below for the actual license texts. Actually both licenses are BSD-style Open Source licenses. In case of any license issues related to OpenSSL please contact openssl-core@openssl.org.
Copyright © 1998-2007 The OpenSSL Project. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions, and the following disclaimer in the documentation or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software must display the following acknowledgment: “This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit ( http://www.openssl.org/)”.
4. The names “OpenSSL Toolkit” and “OpenSSL Project” must not be used to endorse or promote products derived from this software without prior written permission. For written permission, please contact openssl-core@openssl.org.
5. Products derived from this software may not be called “OpenSSL” nor may “OpenSSL” appear in their names without prior written permission of the OpenSSL Project.
6. Redistributions of any form whatsoever must retain the following acknowledgment:
“This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit ( http://www.openssl.org/)”.
THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT “AS IS”' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
This product includes cryptographic software written by Eric Young (eay@cryptsoft.com). This product includes software written by Tim Hudson (tjh@cryptsoft.com).
Copyright © 1995-1998 Eric Young (eay@cryptsoft.com). All rights reserved.
This package is an SSL implementation written by Eric Young (eay@cryptsoft.com).
The implementation was written so as to conform with Netscapes SSL.
This library is free for commercial and non-commercial use as long as the following conditions are adhered to. The following conditions apply to all code found in this distribution, be it the RC4, RSA, lhash, DES, etc., code; not just the SSL code. The SSL documentation included with this distribution is covered by the same copyright terms except that the holder is Tim Hudson (tjh@cryptsoft.com).
Copyright remains Eric Young’s, and as such any Copyright notices in the code are not to be removed. If this package is used in a product, Eric Young should be given attribution as the author of the parts of the library used. This can be in the form of a textual message at program startup or in documentation (online or textual) provided with the package.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software must display the following acknowledgement:
“This product includes cryptographic software written by Eric Young (eay@cryptsoft.com)”.
The word ‘cryptographic’ can be left out if the routines from the library being used are not cryptography-related.
4. If you include any Windows specific code (or a derivative thereof) from the apps directory (application code) you must include an acknowledgement: “This product includes software written by Tim Hudson (tjh@cryptsoft.com)”.
THIS SOFTWARE IS PROVIDED BY ERIC YOUNG “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The license and distribution terms for any publicly available version or derivative of this code cannot be changed. i.e. this code cannot simply be copied and put under another distribution license [including the GNU Public License].
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional information, see the monthly What’s New in Cisco Product Documentation, which also lists all new and revised Cisco technical documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
Subscribe to the What’s New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free service and Cisco currently supports RSS Version 2.0.
This document is to be used in conjunction with the documents listed in the “Related Documentation” section.
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