Release Notes for the Catalyst 4500-X Series Switches, Cisco IOS XE 3.4.xSG
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Release Notes for the Catalyst 4500-X Series Switches, Cisco IOS XE Release 3.4.xSG
Supported Hardware on the Catalyst 4500-X Series Switches
Features Not Supported on the Cisco Catalyst 4500-X Series Switches
New Software Features in Release IOS XE 3.4.2SG
New Hardware Features in Release IOS XE 3.4.2SG
New Software Features in Release IOS XE 3.4.0SG
New Hardware Features in Release IOS XE 3.4.0SG
Cisco IOS XE to Cisco IOS Version Number Mapping
Resolved Caveats for Cisco IOS XE Release 3.4.8SG
Open Caveats for Cisco IOS XE Release 3.4.7SG
Resolved Caveats for Cisco IOS XE Release 3.4.7SG
Open Caveats for Cisco IOS XE Release 3.4.6SG
Resolved Caveats for Cisco IOS XE Release 3.4.6SG
Open Caveats for Cisco IOS XE Release 3.4.5SG
Resolved Caveats for Cisco IOS XE Release 3.4.5SG
Open Caveats for Cisco IOS XE Release 3.4.4SG
Resolved Caveats for Cisco IOS XE Release 3.4.4SG
Open Caveats for Cisco IOS XE Release 3.4.3SG
Resolved Caveats for Cisco IOS XE Release 3.4.3SG
Open Caveats for Cisco IOS XE Release 3.4.2SG
Resolved Caveats for Cisco IOS XE Release 3.4.2SG
Open Caveats for Cisco IOS XE Release 3.4.1SG
Resolved Caveats for Cisco IOS XE Release 3.4.1SG
Open Caveats for Cisco IOS XE Release 3.4.0SG
Resolved Caveats for Cisco IOS XE Release 3.4.0SG
Obtaining Documentation and Submitting a Service Request
Release Notes for the Catalyst 4500-X Series Switches, Cisco IOS XE Release 3.4.xSG
Current release
IOS XE 3.4.8 SG—Nov 11, 2016
Prior release
IOS XE 3.4.7 SG, IOS XE 3.4.6SG, IOS XE 3.4.5SG, IOS XE 3.4.4SG, IOS OS XE 3.4.3SG, XE 3.4.2SG, XE 3.4.1SG, XE 3.4.0SG
This release note describes the features, modifications, and caveats for the Cisco IOS XE 3.4.xSG software on the Catalyst 4500-X Series switch
Cisco IOS XE Software Release 3.4.2SG introduces the Permanent Right-to-Use (PRTU) license feature.
Cisco IOS XE Software Release 3.4.0SG delivers new software and hardware innovations in campus access and aggregation deployments that span across many technologies including Security, Video, HighAvailability, NetworkVirtualization, IPMulticast and Lower TCO as following:
–
Layer 2 Multichassis EtherChannel (MEC)
– Enhanced Port Aggregation Protocol (ePAgP) split brain detection method
– Cross-chassis Nonstop Forwarding with Stateful Switchover (NSF/SSO)
– Cross-chassis in-service software upgrade (ISSU)
– Support for virtual switch link (VSL) on 1 Gigabit and 10 Gigabit links
– All four ports on quad supervisor scenario may be used for uplink
– Lightweight DHCPv6 Relay Agent (LDRA)
– IPv6 Neighbor Discovery Multicast Suppression
– IPv6 Router Advertisement (RA) Guard
– Secure Shell SSH Version 2 Client Support
– Secure Shell SSH Version 2 Server Support
– SSH Keyboard Interactive Authentication
– SSHv2 Enhancements for RSA Keys
Lower Total Cost of Ownership and Ease of Use
Routing and Multicast Enhancements
- BGP Consistency Checker
- IPv6 Bootstrap Router (BSR) Scoped Zone support
- OSPFv3 Address Families
- OSPFv3 Time To Live Security
- Policy Based Routing: Recursive Next Hop
- FTP IPv6 Support
- IPSLA 4.0 - IPv6 phase 2
- IPSLA Multicast Support
- NTPv4 Orphan Mode support, Range for trusted key configuration
- TFTP IPv6 Support
- WSMA and XMLPI enhancement
Support for Cisco IOS XE Release 3.4.0SG follows the standard Cisco Systems® support policy, available at
http://www.cisco.com/en/US/products/products_end-of-life_policy.html
For more information on the Catalyst 4500-X switch, visit the following URL:
http://www.cisco.com//en/US/products/ps12332/index.html
Note Although their Release Notes are unique, the platforms Catalyst 4500E and Catalyst 4500-X use the same Software Configuration Guide, Command Reference Guide, and System Message Guide.
Cisco IOS Software Packaging
The Enterprise Services image supports all Cisco Catalyst 4500-X Series software features based on Cisco IOS Software, including enhanced routing.
The IP Base image supports Open Shortest Path First (OSPF) for Routed Access, Enhanced Interior Gateway Routing Protocol (EIGRP) "limited" Stub Routing, Nonstop Forwarding/Stateful Switchover (NSF/SSO), and RIPv1/v2. The IP Base image does not support enhanced routing features such as BGP, Intermediate System-to-Intermediate System (IS-IS), Internetwork Packet Exchange (IPX), AppleTalk, Virtual Routing Forwarding (VRF-lite), and policy-based routing (PBR).
Starting with Cisco IOS Release (3.3.0SG or 15.1(1)SG, support for IP SLAs and NSF have been extended from Enterprise Services to IP Base.
Cisco IOS XE Release Strategy
Customers with Catalyst 4500-X Series Switches who need the latest hardware and software features should migrate to Cisco IOS Release XE 3.4.0SG.
IOS XE 3.4.xSG is a maintenance train supporting Sup7E, Sup7L-E and 4500-X.
Figure 1 displays the one active train, 3.4.0SG.
Figure 1 Software Release Strategy for the Catalyst 4500-X Series Switch
Support
Support for Cisco IOS Software Release XE 3.4.0SG 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 the Catalyst 4500-X Series Switches
- Feature Support by Image Type
- MIB Support
- Features Not Supported on the Cisco Catalyst 4500-X Series Switches
- Orderable Product Numbers
Supported Hardware on the Catalyst 4500-X Series Switches
For information on the minimum supported release for each pluggable module please refer to:
http://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.html
Table 1 lists the hardware supported on the Catalyst 4500-X Series switches.
1000BASE-BX10-D small form-factor pluggable module |
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1000BASE-BX10-U small form-factor pluggable module |
|
1000BASE-LX/LH small form-factor pluggable module with DOM support |
|
1000BASE-EX small form-factor pluggable module with DOM support |
|
1000BASE-ZX small form-factor pluggable module with DOM support |
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CWDM small form-factor pluggable module (See Table 2 for a list of supported wavelengths.) |
|
Cisco 10GBASE-ZR SFP+ Module for SMF Note This module is only supported on the uplink module in the back-to-front airflow configuration. |
|
Table 2 briefly describes the supported CWDM wavelengths in the Catalyst 4500-X Series switch.
Table 3 briefly describes the supported DWDM wavelengths on the Catalyst 4500-X Series Switches.
For a complete list of Cisco Gigabit Ethernet Transceiver Modules, please refer to the URL:
http://www.cisco.com//c/en/us/td/docs/interfaces_modules/transceiver_modules/compatibility/matrix/OL_6981.html#38544
Table 4 briefly describes the DOM support on the Catalyst 4500-X Series switches.
Feature Support by Image Type
Table 5 is a detailed list of features supported on Catalyst 4500-X Series switches running Cisco IOS Software Release 3.4.0SG categorized by image type. Please visit Feature Navigator for package details:
http://tools.cisco.com/ITDIT/CFN/
BGP Increased Support of Numbered as-path Access Lists to 500 |
||
CFM/IEEE 802.1ag - D8.1 standard Compliant CFM, Y.1731 multicast LBM / AIS / RDI / LCK, IP SLA for Ethernet |
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Class Based Ethernet CoS Matching & Marking (802.1p & ISL CoS) |
||
FHRP - Enhanced Object Tracking of IP SLAs1 |
||
IEEE 802.1s Multiple Spanning Tree (MST) Standard Compliance |
||
IEEE 802.1t2 |
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IEEE 802.3ad Link Aggregation (LACP) Port-Channel Standalone Disable |
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IGMP Version 3 - Explicit Tracking of Hosts, Groups, and Channels |
||
IP Multicast Load Splitting - Equal Cost Multipath (ECMP) using S, G and Next-hop |
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IPv6 First Hop Security (FHS): Lightweight DHCPv6 Relay Agent |
||
Yes 3 |
||
IPv6 Multicast: Multicast Listener Discovery (MLD) Protocol, Versions 1 and 2 |
||
IPv6 Multicast: RPF Flooding of Bootstrap Router (BSR) Packets |
||
Yes 3 |
||
Yes3 |
||
IPv6 Services: Cisco Discovery Protocol (CDP) - IPv6 Address Family Support for Neighbor Information |
||
IPv6 Switching: CEFv6 Switched Automatic IPv4-compatible Tunnels (in software) |
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IPv6 Switching: CEFv6 Switched Configured IPv6 over IPv4 Tunnels (in software) |
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IPv6 Tunneling: Automatic IPv4-compatible Tunnels (in software) |
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IPv6 Tunneling: Manually Configured IPv6 over IPv4 Tunnels (in software) |
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Medianet 2.0: Integrated Video Traffic Simulator (hardware-assisted IP SLA); IPSLA generator and responder |
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Medianet 2.0: Media Monitoring (Performance Monitoring and Mediatrace) |
||
NEAT Enhancement: Re-Enabling BPDU Guard Based on User Configuration |
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Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
Yes 3 |
||
RADIUS Attribute 44 (Accounting Session ID) in Access Requests |
||
Smart Install Director Support4 |
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Source Specific Multicast (SSM) - IGMPv3,IGMP v3lite, and URD |
||
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2.EEE 802.1t—An IEEE amendment to IEEE 802.1D that includes extended system ID, long path cost, and PortFast. |
MIB Support
For information on MIB support, please refer to this URL:
http://ftp.cisco.com/pub/mibs/supportlists/cat4000/cat4000-supportlist.html
Features Not Supported on the Cisco Catalyst 4500-X Series Switches
The following features are not supported on a Catalyst 4500-X Series switches:
- CISCO-IETF-IP-FORWARD-MIB
- CISCO-IETF-IP-MIB
- LLDP HA
- SSO
- WCCP Version 1
- TrustSec: IEEE 802.1ae MACSec Layer 2 encryption
- TrustSec: IEEE 802.1ae MACSec encryption on user facing ports
- TrustSec: IEEE 802.1ae MACSec encryption on user facing ports SSO
- TrustSec: IEEE 802.1ae MACSec encryption between switch-to-switch links using Cisco SAP (Security Association Protocol)
With some exceptions, the VSS maintains “feature parity” with the standalone Catalyst 4500 or 4500-X series switches. Major exceptions include:
- CFM D8.1
- Dot1q Tunnel (“legacy/classic” dot1q tunnel)
- Dot1q tunneling and L2PT (Layer 2 Protocol Tunneling)
- Energywise
- Fast UDLD
- Flexlink
- Mediatrace (Medianet active video monitoring feature)
- Metadata (Medianet feature)
- Per VLAN Learning
- REP and associated featurettes
- UDE
- UDLR
- VLAN Translation (1:1 and 1:2-Selective QinQ)
- VMPS Client
- WCCP
Note Smart Install Director is not supported with VSS.
Orderable Product Numbers
New and Changed Information
These sections describe the new and changed information for the Catalyst 4500-X Series switch running Cisco IOS XE software:
- New Software Features in Release IOS XE 3.4.2SG
- New Hardware Features in Release IOS XE 3.4.2SG
- New Software Features in Release IOS XE 3.4.0SG
- New Hardware Features in Release IOS XE 3.4.0SG
New Software Features in Release IOS XE 3.4.2SG
Release IOS XE 3.4.2SG provides the following new software on Catalyst 4500 Series switches:
New Hardware Features in Release IOS XE 3.4.2SG
Release IOS XE 3.4.0SG provides no new hardware on Catalyst 4500 Series switches.
New Software Features in Release IOS XE 3.4.0SG
Release IOS XE 3.4.0SG provides the following new software features on the Catalyst 4500-X Series switch.
– Lightweight DHCPv6 Relay Agent (LDRA)
– IPv6 Neighbor Discovery Multicast Suppression
– IPv6 Router Advertisement (RA) Guard
– Secure Shell SSH Version 2 Client Support
– Secure Shell SSH Version 2 Server Support
– SSH Keyboard Interactive Authentication
– SSHv2 Enhancements for RSA Keys
Lower Total Cost of Ownership and Ease of Use
Cisco IOS XE to Cisco IOS Version Number Mapping
As Table 7 shows, each version of Cisco IOS XE has an associated Cisco IOS version:
Upgrading the System Software
If you are upgrading to IOS XE Version 3.4.0SG and are planning on using VSS, you must upgrade your ROMMON to IOS Version 15.0(1r)SG7. Else, leave the ROMMON at its default level.
You can upgrade a ROMMON image either through a console or telnet.
Limitations and Restrictions
These sections list the limitations and restrictions for the current release of Cisco IOS software on the Catalyst 4500-X Series switches.
- Starting with Release IOS XE 3.3.0SG and IOS 15.1(1)SG, the seven RP restriction was removed.
- More than 16K QoS policies can be configured in software. Only the first 16K are installed in hardware.
- Adjacency learning (through ARP response frames) is restricted to roughly 1000 new adjacencies per second, depending on CPU utilization. This should only impact large networks on the first bootup. After adjacencies are learned they are installed in hardware.
- Multicast fastdrop entries are not created when RPF failure occurs with IPv6 multicast traffic. In a topology where reverse path check failure occurs with IPv6 multicast, this may cause high CPU utilization on the switch.
- The SNMP ceImageFeature object returns a similar feature list for all the three license levels (IP Base and EntServices). Although the activated feature set for a universal image varies based on the installed feature license, the value displayed by this object is fixed and is not based on the feature license level.
- Standard TFTP implementation limits the maximum size of a file that can be transferred to 32 MB. If ROMMON is used to boot an IOS image that is larger than 32 MB, the TFTP transfer fails at the 65,xxx datagram.
TFTP numbers its datagrams with a 16 bit field, resulting in a maximum of 65,536 datagrams. Because each TFTP datagram is 512 bytes long, the maximum transferable file is 65536 x 512 = 32 MB. If both the TFTP client (ROMMON) and the TFTP server support block number wraparound, no size limitation exists.
Cisco has modified the TFTP client to support block number wraparound. So, if you encounter a transfer failure, use a TFTP server that supports TFTP block number wraparound. Because most implementations of TFTP support block number wraparound, updating the TFTP daemon should fix the issue.
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:
- When attaching an existing policy-map (that is already applied to a control-port) to another front-panel port, the following message displays:
Workaround: Define a policy-map with a different name and then reattach. CSCti26172
- If the number of unique FNF monitors attached to target exceeds 2048 (one per target), a switch responds slowly:
– Decrease the number of monitors.
– Attach the same monitor to multiple targets. CSCti43798
- ciscoFlashPartitionFileCount object returns an incorrect file count for bootflash:, usb0:, slot0:, slaveslot0:, slavebootflash:, and slaveusb0:.
Workaround: Use the dir device command (for example, dir bootflash:) to obtain the correct file count. CSCti74130
- If multicast is configured and you make changes to the configuration, Traceback and CPUHOG messages are displayed if the following conditions exist:
– At least 10K groups and roughly 20K mroutes exist.
– IGMP joins with source traffic transit to all the multicast groups.
This is caused by the large number of updates generating SPI messages that must be processed by the CPU to ensure that the platform is updated with the changes in all the entries.
- With traffic running, entering clear ip mroute * with larger number of mroutes and over 6 OIFs will cause Malloc Fail messages to display.
You cannot clear a large number of mroutes at one time when traffic is still running.
Workaround: Do not clear all mroutes at once.
- 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.
- Energywise WOL is not “waking up” a PC in hibernate or standby mode.
Workaround: Use the show version command. CSCtr30294
Workaround: Select an alternate destination or source port. CSCty05405
- When either the RADIUS-server test feature is enabled or RADIUS-server dead-criteria is configured, and either RADIUS-server deadtime is set to 0 or not configured, the RADIUS-server status is not properly relayed to AAA.
Workaround: Configure both dead-criteria and deadtime.
– Links flap for various Layer 3 protocols.
– A traffic loss of several seconds is observed during the upgrade process.
Workaround: Do not use the quick option with the issu changeversion command. CSCto51562
- While configuring an IPv6 access-list, if you specify hardware statistics as the first statement in v6 access-list mode (i.e. before issuing any other v6 ACE statement), it will not take effect. Similarly, your hardware statistics configuration will be missing from the output of the show running command.
You will not experience this behavior with IPv4 access lists.
Workaround: During IPv6 access-list configuration, configure at least one IPv6 ACE before the "hardware statistics" statement. CSCuc53234
- Routed packets that are fragmented are not policed if the egress interface is on the VSS Standby switch. However, if the egress interface is on the VSS active switch, these packets are policed.
This applies to QoS policing only. QoS marking, shaping and sharing behave as expected.
- When an IPv6 FHS policy is applied on a VLAN and an EtherChannel port is part of that VLAN, packets received by EtherChannel (from neighbors) are not bridged across the local switch.
Workaround: Apply FHS policies on a non EtherChannel port rather than a VLAN. CSCua53148
- During VSS conversion, the switch intended as the Standby device may require up to 9 minutes to reach an SSO state. The boot up time depends on the configuration and on the number of line cards in the system.
Because the Catalyst 4500-X is a “fixed” configuration device, in a VSS, you would expect the two systems to be labeled 'Module 1' and 'Module 2.’ However, because of software implementation similarities with the modular Catalyst 4500E series switches, the Standby switch is labeled 'Module 11.’
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 For the latest information on PSIRTS, refer to the Security Advisories on CCO at the following URL:
http://www.cisco.com/en/US/products/products_security_advisories_listing.html
Cisco Bug Search Tool
The Bug Search Tool (BST) is the online successor to Bug Toolkit and 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. You can access the tool at: https://tools.cisco.com/bugsearch/.
To view the details of a caveat listed in this document:
Resolved Caveats for Cisco IOS XE Release 3.4.8SG
Resolved Caveats for Cisco IOS XE Release 3.4.7SG
Open Caveats for Cisco IOS XE Release 3.4.6SG
Resolved Caveats for Cisco IOS XE Release 3.4.6SG
Open Caveats for Cisco IOS XE Release 3.4.5SG
Resolved Caveats for Cisco IOS XE Release 3.4.5SG
Open Caveats for Cisco IOS XE Release 3.4.4SG
This section lists the open caveats for Cisco IOS XE Release 3.4.4SG:
- When you enable both Cisco TrustSec and RADIUS accounting, a disparity occurs between the RADIUS client (Cisco switch) and the RADIUS/CTS server in how the authenticator field in the header is computed for DOT1X/RADIUS accounting messages.
A Cisco IOS AAA client uses the PAC secret to compute the authenticator; Cisco Secure ACS 5.2 uses the shared secret. This behavior causes a mismatch that results in a rejection of the accounting message, and the client marks the server as unresponsive.
Workaround: None. You must disable 802.1X accounting. CSCts26844
- When more than one Equal Cost Multipath (ECMP) is available on the downstream switch, and Mediatrace is invoked to provide flow statistics, the dynamic policy does not display flow statistics.
Mediatrace cannot find the correct inbound interface and applies the dynamic policy on a different interface from the one used for media flow.
- When you add a "bfd" suffix to the snmp server host x.x.x.x configuration command, the BFD traps, ciscoBfdSessUp and ciscoBfdSessDown, are not generated.
Workaround: Do not specify a "bfd" suffix with the snmp-server host x.x.x.x configuration command. CSCtx51561
- In a multichassis port channel on a VSS system with a very high number of link up and down events that occur within a second and typically causes an error-disable event, only the ports on the active switch are error-disabled due to flaps.
- The following (information-only) error message and traceback may occur during MFIB-to-platform state updates for Bidirectional PIM (*,G/m) entries associated with Bidirectional PIM rendezvous points:
These messages are typically observed during SSO, bootup, or when a PIM-enabled interface undergoes a state transition on a switch containing Bidir PIM state entries.
- A device in a guest VLAN that is connected behind a phone capable of 2nd-port-notification experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- When MLD Snooping is disabled, a Catalyst 4500-X switch cannot maintain 6,000 MLD joins, causing traffic loss due to missing outgoing interfaces.
Workaround: Enable MLD snooping. CSCtx82176
Workaround: Use the show spi-fc all command to dump all SPI channel information. CSCuc81286
- You can attach an input QoS policy to VSL member ports, but you cannot detach it. You only can configure VSL ports.
Workaround: Default the VSL member ports and detach the input QoS policy. CSCuc49150
- When a Catalyst 4500-X uplink module is removed incorrectly, hardware forwarding tables are frozen, and baseboard ports remain connected for 20 to 25 seconds.
Workaround: Remove the Catalyst 4500-X module by first pressing the Ejector button for 10 seconds until the light turns green. CSCty67871
Caution: If you remove the module without following this procedure, the system always shuts down (or fails). Always use the Ejector button.
The exact triggers are unknown.
Workaround: Reapply the configuration when the switch reboots. CSCum71764
- After performing an ISSU from Cisco IOS Release 3.2.3 to 3.2.7, multicast packet loss is observed after both supervisor engines are running IOS Release 3.2.7
Workaround: Do a switchover. CSCuo18934
- On a VSS active switch, devices (i.e., hosts, phones, or workstations) directly connected to ports Gi1/7/38, Gi1/7/39, Gi1/7/40, Gi1/7/43 on VLAN 34 cannot reach the internet or server.
- Occasionally, when netflow sampling is enabled, LACP requires about 60-70 sec until members are bundled.
Workaround: Disable netflow sampling. CSCtg00542
- Upon adding a new static MAC entry on a Catalyst 4500X VSS running version 3.4.3 and 3.5.x, the switch number is truncated in the running config. Although the entry functions as expected, it displays incorrectly. Upon reload, it encounters an error because the entry is no longer a valid switch, module, or port.
Upon reload, the config errors out
Workaround: After a reload, manually re-add the static entry into the running config. CSCuo60703
Resolved Caveats for Cisco IOS XE Release 3.4.4SG
This section lists the resolved caveats for Cisco IOS XE Release 3.4.4SG:
- Packets that are routed on the same Layer 3 interface (or SVI) that entered on are dropped if received on the VSS standby switch.
- When you configure open authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. This behavior interrupts traffic only after the second switchover because the new standby supervisor engine possesses the wrong state after the initial switchover and the second switchover starts the port in the blocking state.
Workaround: Enter shut and no shut on the port to synchronize the STP state. CSCtf52437
- For the 10-Gigabit interface on a Catalyst 4500-X switch, link flaps are observed if the debounce interval is defined with the link debounce time command to within 1 second of the pulse interval.
For example, if the pulse interval is 250 ms and the debounce interval is 500 ms, then the delta is 250 ms and the debouce will be ineffective.
Workaround: Define a debounce interval that is at least 1 second greater than the incoming pulse interval. CSCtx75188
Open Caveats for Cisco IOS XE Release 3.4.3SG
This section lists the open caveats for Cisco IOS XE Release 3.4.3SG:
- When an SNMP query includes the cpmCPUProcessHistoryTable, the query time is very slow, and CPU utilization of the os_info_p process (OS Information provider) increases substantially. The query time of an almost fully populated table is 68 minutes.
- The show ipv6 access-list command displays incorrect match counts when multicast traffic is matched to an IPv6 access list that is attached to an SVI.
- When you configure open authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. This behavior interrupts traffic only after the second switchover because the new standby supervisor engine possesses the wrong state after the initial switchover and the second switchover starts the port in the blocking state.
Workaround: Enter shut and no shut on the port to synchronize the STP state. CSCtf52437
- If you reboot a switch, the configured value of the interface MTU size for the elements of the port channel interface is invalid for IPv6 traffic.
Workaround: After a switch reloads, enter shut and no shut on the port-channel interface.
Workaround: Increase the queue limit to at least 256. CSCto57602
- A device in a guest VLAN that is connected behind a phone capable of 2nd-port-notification experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you perform an OIR on a line card, several %C4K_RKNOVA-4-INVALIDTOKENEXPIRED messages appear in the logs.
- When you enable both Cisco TrustSec and RADIUS accounting, a disparity occurs between the RADIUS client (Cisco switch) and the RADIUS/CTS server in how the authenticator field in the header is computed for DOT1X/RADIUS accounting messages.
A Cisco IOS AAA client uses the PAC secret to compute the authenticator; Cisco Secure ACS 5.2 uses the shared secret. This behavior causes a mismatch that results in a rejection of the accounting message, and the client marks the server as unresponsive.
Workaround: None. You must disable 802.1X accounting. CSCts26844
- When more than one Equal Cost Multipath (ECMP) is available on the downstream switch, and Mediatrace is invoked to provide flow statistics, the dynamic policy does not display flow statistics.
Mediatrace cannot find the correct inbound interface and applies the dynamic policy on a different interface from the one used for media flow.
- When a switchover is created on the Mediatrace responder, the dynamic access list created for a monitored flow tuple is not deleted. Although the Mediatrace initiator creates another set of dynamic access lists after the switchover, the old ones remain in the configuration.
Stale dynamic access lists force the system to monitor unwanted traffic.
– If the switchover is scheduled, remove the scheduled session on the initiator, and reschedule the session after the new active supervisor engine boots on the responder.
– After the new active supervisor engine boots, and provided the Mediatrace responder SSO is not planned, manually delete the stale dynamic access lists. CSCty75070
- When you add a "bfd" suffix to the snmp server host x.x.x.x configuration command, the BFD traps, ciscoBfdSessUp and ciscoBfdSessDown, are not generated.
Workaround: Do not specify a "bfd" suffix with the snmp-server host x.x.x.x configuration command. CSCtx51561
- When MLD Snooping is disabled, a Catalyst 4500-X switch cannot maintain 6,000 MLD joins, causing traffic loss due to missing outgoing interfaces.
Workaround: Enable MLD snooping. CSCtx82176
- During either a system- or user-initiated reload operation, the following message is observed when the system shuts down:
This message is not observed during a system bootup.
Workaround: None required. This message is information only. CSCtz15738
- When a Catalyst 4500-X uplink module is removed incorrectly, hardware forwarding tables are frozen, and baseboard ports remain connected for 20 to 25 seconds.
Workaround: Remove the Catalyst 4500-X module by first pressing the Ejector button for 10 seconds until the light turns green. CSCty67871
Caution: If you remove the module without following this procedure, the system always shuts down (or fails). Always use the Ejector button.
- For the 10-Gigabit interface on a Catalyst 4500-X switch, link flaps are observed if the debounce interval is defined with the link debounce time command to within 1 second of the pulse interval.
For example, if the pulse interval is 250 ms and the debounce interval is 500 ms, then the delta is 250 ms and the debouce will be ineffective.
Workaround: Define a debounce interval that is at least 1 second greater than the incoming pulse interval. CSCtx75188
- In a multichassis port channel on a VSS system with a very high number of link up and down events that occur within a second and typically causes an error-disable event, only the ports on the active switch are error-disabled due to flaps.
Workaround: Use the show spi-fc all command to dump all SPI channel information. CSCuc81286
Workaround: None. The ip pim register-rate-limit command does not function. CSCub32679
- Packets that are routed on the same Layer 3 interface (or SVI) that entered on are dropped if received on the VSS standby switch.
Workaround: Enter shut, then no shut to bring up the links. CSCuc37676
- You can attach an input QoS policy to VSL member ports, but you cannot detach it. You only can configure VSL ports.
Workaround: Default the VSL member ports and detach the input QoS policy. CSCuc49150
- When VSS receives a VTP message with information about the creation of 4000 VLANs, traceback and syslog messages (containing EM-4-SEARCH) are displayed.
Workaround: None. You might try reducing the the number of VLANs created at one time.
- For packets with the same ingress and egress Layer 3 interface, ingress QoS marking policy does not work.
Workaround: Turn off ICMP redirect with the ip redirect command. CSCua71929
- When the Wireshark feature is applied on a control panel, it fails to capture the correct packets as they travel to the CPU in VSS, under the following conditions:
– Incoming packets on the VSS standby port are directed to the CPU for host learning.
– Layer 3 exceptions occur for packets arriving on the VSS standby port.
– ACL logging occurs on the VSS standby port.
- The POST results on the VSS standby switch displayed by the show diagnostic result module all detail command indicate module number 1 rather than 11. The module number is not interpreted by Cisco IOS.
- The following (information-only) error message and traceback may occur during MFIB-to-platform state updates for Bidirectional PIM (*,G/m) entries associated with Bidirectional PIM rendezvous points:
These messages are typically observed during SSO, bootup, or when a PIM-enabled interface undergoes a state transition on a switch containing Bidir PIM state entries.
Resolved Caveats for Cisco IOS XE Release 3.4.3SG
This section lists the resolved caveats for Cisco IOS XE Release 3.4.3SG:
- On systems performing multicast routing, a brief increase in CPU consumption occurs every few minutes. In large-scale environments, this CPU increase is more noticeable.
- Following a switchover on VSS, CPU may remain high. The show platform cpu packet statistics command displays high usage due to “SA Miss.”
Workaround: Clear the MAC table. CSCuh50329
- A port configured for webauth is not programmed with the default or fallback ACL when sessions enter the INIT state.
- When a device authenticates with dot1x after authenticating with MAB, any policies applied by MAB remain in place.
– Ensure that the dot1x supplicant always authenticates before MAB.
– Create MAB policies for dot1x hosts that do not supply a URL redirect. CSCui79988
- On a Catalyst 4500 VSS using IOS Release XE 3.4.0SG to 3.4.2SG, or 3.5.0E, the show platform command may be truncated with a "Timed out" message and may rarely produce an unexpected reload. The likelihood of a reload increases if the command is issued over an SSH session or if the output is redirected to a file. The same behavior is observed using IOS Release XE 3.5.0 and the show tech command.
Open Caveats for Cisco IOS XE Release 3.4.2SG
This section lists the open caveats for Cisco IOS XE Release 3.4.2SG:
- When an SNMP query includes the cpmCPUProcessHistoryTable, the query time is very slow, and CPU utilization of the os_info_p process (OS Information provider) increases substantially. The query time of an almost fully populated table is 68 minutes.
- The show ipv6 access-list command displays incorrect match counts when multicast traffic is matched to an IPv6 access list that is attached to an SVI.
- When you configure open authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. This behavior interrupts traffic only after the second switchover because the new standby supervisor engine possesses the wrong state after the initial switchover and the second switchover starts the port in the blocking state.
Workaround: Enter shut and no shut on the port to synchronize the STP state. CSCtf52437
- If you reboot a switch, the configured value of the interface MTU size for the elements of the port channel interface is invalid for IPv6 traffic.
Workaround: After a switch reloads, enter shut and no shut on the port-channel interface.
Workaround: Increase the queue limit to at least 256. CSCto57602
- A device in a guest VLAN that is connected behind a phone capable of 2nd-port-notification experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you perform an OIR on a line card, several %C4K_RKNOVA-4-INVALIDTOKENEXPIRED messages appear in the logs.
- When you enable both Cisco TrustSec and RADIUS accounting, a disparity occurs between the RADIUS client (Cisco switch) and the RADIUS/CTS server in how the authenticator field in the header is computed for DOT1X/RADIUS accounting messages.
A Cisco IOS AAA client uses the PAC secret to compute the authenticator; Cisco Secure ACS 5.2 uses the shared secret. This behavior causes a mismatch that results in a rejection of the accounting message, and the client marks the server as unresponsive.
Workaround: None. You must disable 802.1X accounting. CSCts26844
- When more than one Equal Cost Multipath (ECMP) is available on the downstream switch, and Mediatrace is invoked to provide flow statistics, the dynamic policy does not display flow statistics.
Mediatrace cannot find the correct inbound interface and applies the dynamic policy on a different interface from the one used for media flow.
- When a switchover is created on the Mediatrace responder, the dynamic access list created for a monitored flow tuple is not deleted. Although the Mediatrace initiator creates another set of dynamic access lists after the switchover, the old ones remain in the configuration.
Stale dynamic access lists force the system to monitor unwanted traffic.
– If the switchover is scheduled, remove the scheduled session on the initiator, and reschedule the session after the new active supervisor engine boots on the responder.
– After the new active supervisor engine boots, and provided the Mediatrace responder SSO is not planned, manually delete the stale dynamic access lists. CSCty75070
- When you add a "bfd" suffix to the snmp server host x.x.x.x configuration command, the BFD traps, ciscoBfdSessUp and ciscoBfdSessDown, are not generated.
Workaround: Do not specify a "bfd" suffix with the snmp-server host x.x.x.x configuration command. CSCtx51561
- When MLD Snooping is disabled, a Catalyst 4500-X switch cannot maintain 6,000 MLD joins, causing traffic loss due to missing outgoing interfaces.
Workaround: Enable MLD snooping. CSCtx82176
- During either a system- or user-initiated reload operation, the following message is observed when the system shuts down:
This message is not observed during a system bootup.
Workaround: None required. This message is information only. CSCtz15738
- When a Catalyst 4500-X uplink module is removed incorrectly, hardware forwarding tables are frozen, and baseboard ports remain connected for 20 to 25 seconds.
Workaround: Remove the Catalyst 4500-X module by first pressing the Ejector button for 10 seconds until the light turns green. CSCty67871
Caution: If you remove the module without following this procedure, the system always shuts down (or fails). Always use the Ejector button.
- For the 10-Gigabit interface on a Catalyst 4500-X switch, link flaps are observed if the debounce interval is defined with the link debounce time command to within 1 second of the pulse interval.
For example, if the pulse interval is 250 ms and the debounce interval is 500 ms, then the delta is 250 ms and the debouce will be ineffective.
Workaround: Define a debounce interval that is at least 1 second greater than the incoming pulse interval. CSCtx75188
- In a multichassis port channel on a VSS system with a very high number of link up and down events that occur within a second and typically causes an error-disable event, only the ports on the active switch are error-disabled due to flaps.
Workaround: Use the show spi-fc all command to dump all SPI channel information. CSCuc81286
Workaround: None. The ip pim register-rate-limit command does not function. CSCub32679
- Packets that are routed on the same Layer 3 interface (or SVI) that entered on are dropped if received on the VSS standby switch.
Workaround: Enter shut, then no shut to bring up the links. CSCuc37676
- You can attach an input QoS policy to VSL member ports, but you cannot detach it. You only can configure VSL ports.
Workaround: Default the VSL member ports and detach the input QoS policy. CSCuc49150
- When VSS receives a VTP message with information about the creation of 4000 VLANs, traceback and syslog messages (containing EM-4-SEARCH) are displayed.
Workaround: None. You might try reducing the the number of VLANs created at one time.
- For packets with the same ingress and egress Layer 3 interface, ingress QoS marking policy does not work.
Workaround: Turn off ICMP redirect with the ip redirect command. CSCua71929
- On systems performing multicast routing, a brief increase in CPU consumption occurs every few minutes. In large-scale environments, this CPU increase is more noticeable.
- When the Wireshark feature is applied on a control panel, it fails to capture the correct packets as they travel to the CPU in VSS, under the following conditions:
– Incoming packets on the VSS standby port are directed to the CPU for host learning.
– Layer 3 exceptions occur for packets arriving on the VSS standby port.
– ACL logging occurs on the VSS standby port.
- The POST results on the VSS standby switch displayed by the show diagnostic result module all detail command indicate module number 1 rather than 11. The module number is not interpreted by Cisco IOS.
- The following (information-only) error message and traceback may occur during MFIB-to-platform state updates for Bidirectional PIM (*,G/m) entries associated with Bidirectional PIM rendezvous points:
These messages are typically observed during SSO, bootup, or when a PIM-enabled interface undergoes a state transition on a switch containing Bidir PIM state entries.
- Following a switchover on VSS, CPU may remain high. The show platform cpu packet statistics command displays high usage due to “SA Miss.”
Workaround: Clear the MAC table. CSCuh50329
- A port configured for webauth is not programmed with the default or fallback ACL when sessions enter the INIT state.
- When a device authenticates with dot1x after authenticating with MAB, any policies applied by MAB remain in place.
– Ensure that the dot1x supplicant always authenticates before MAB.
– Create MAB policies for dot1x hosts that do not supply a URL redirect. CSCui79988
- On a Catalyst 4500 VSS using IOS Release XE 3.4.0SG to 3.4.2SG, or 3.5.0E, the show platform command may be truncated with a "Timed out" message and may rarely produce an unexpected reload. The likelihood of a reload increases if the command is issued over an SSH session or if the output is redirected to a file. The same behavior is observed using IOS Release XE 3.5.0 and the show tech command.
Resolved Caveats for Cisco IOS XE Release 3.4.2SG
This section lists the resolved caveats for Cisco IOS XE Release 3.4.2SG:
- A GLC-GE-100FX pluggable may not operate when used in WS-X4624-SFP-E, WS-X4640-CSFP-E or WS-X4612-SFP-E modules.
- The switch may reload unexpectedly or become inaccessible when the integrated web server is used, either through direct web access to the switch, or indirectly through the webauth feature.
Workaround: Enter either the no ip http server or the no ip http secure-server command. This disables the http/s server. CSCui14525
- After kron performs a write of the startup-config (e.g. 'write mem'), it is locked indefinitely (i.e., the startup-config and running-config are unavailable):
Workaround; Reload the switch.
To avoid this condition, use EEM with the timer event to schedule the required task.
Open Caveats for Cisco IOS XE Release 3.4.1SG
This section lists the open caveats for Cisco IOS XE Release 3.4.1SG:
- When an SNMP query includes the cpmCPUProcessHistoryTable, the query time is very slow, and CPU utilization of the os_info_p process (OS Information provider) increases substantially. The query time of an almost fully populated table is 68 minutes.
- The show ipv6 access-list command displays incorrect match counts when multicast traffic is matched to an IPv6 access list that is attached to an SVI.
- When you configure open authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. This behavior interrupts traffic only after the second switchover because the new standby supervisor engine possesses the wrong state after the initial switchover and the second switchover starts the port in the blocking state.
Workaround: Enter shut and no shut on the port to synchronize the STP state. CSCtf52437
- If you reboot a switch, the configured value of the interface MTU size for the elements of the port channel interface is invalid for IPv6 traffic.
Workaround: After a switch reloads, enter shut and no shut on the port-channel interface.
Workaround: Increase the queue limit to at least 256. CSCto57602
- A device in a guest VLAN that is connected behind a phone capable of 2nd-port-notification experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you perform an OIR on a line card, several %C4K_RKNOVA-4-INVALIDTOKENEXPIRED messages appear in the logs.
- When you enable both Cisco TrustSec and RADIUS accounting, a disparity occurs between the RADIUS client (Cisco switch) and the RADIUS/CTS server in how the authenticator field in the header is computed for DOT1X/RADIUS accounting messages.
A Cisco IOS AAA client uses the PAC secret to compute the authenticator; Cisco Secure ACS 5.2 uses the shared secret. This behavior causes a mismatch that results in a rejection of the accounting message, and the client marks the server as unresponsive.
Workaround: None. You must disable 802.1X accounting. CSCts26844
- When more than one Equal Cost Multipath (ECMP) is available on the downstream switch, and Mediatrace is invoked to provide flow statistics, the dynamic policy does not display flow statistics.
Mediatrace cannot find the correct inbound interface and applies the dynamic policy on a different interface from the one used for media flow.
- When a switchover is created on the Mediatrace responder, the dynamic access list created for a monitored flow tuple is not deleted. Although the Mediatrace initiator creates another set of dynamic access lists after the switchover, the old ones remain in the configuration.
Stale dynamic access lists force the system to monitor unwanted traffic.
– If the switchover is scheduled, remove the scheduled session on the initiator, and reschedule the session after the new active supervisor engine boots on the responder.
– After the new active supervisor engine boots, and provided the Mediatrace responder SSO is not planned, manually delete the stale dynamic access lists. CSCty75070
- When you add a "bfd" suffix to the snmp server host x.x.x.x configuration command, the BFD traps, ciscoBfdSessUp and ciscoBfdSessDown, are not generated.
Workaround: Do not specify a "bfd" suffix with the snmp-server host x.x.x.x configuration command. CSCtx51561
- When MLD Snooping is disabled, a Catalyst 4500-X switch cannot maintain 6,000 MLD joins, causing traffic loss due to missing outgoing interfaces.
Workaround: Enable MLD snooping. CSCtx82176
- During either a system- or user-initiated reload operation, the following message is observed when the system shuts down:
This message is not observed during a system bootup.
Workaround: None required. This message is information only. CSCtz15738
- When a Catalyst 4500-X uplink module is removed incorrectly, hardware forwarding tables are frozen, and baseboard ports remain connected for 20 to 25 seconds.
Workaround: Remove the Catalyst 4500-X module by first pressing the Ejector button for 10 seconds until the light turns green. CSCty67871
Caution: If you remove the module without following this procedure, the system always shuts down (or fails). Always use the Ejector button.
- For the 10-Gigabit interface on a Catalyst 4500-X switch, link flaps are observed if the debounce interval is defined with the link debounce time command to within 1 second of the pulse interval.
For example, if the pulse interval is 250 ms and the debounce interval is 500 ms, then the delta is 250 ms and the debouce will be ineffective.
Workaround: Define a debounce interval that is at least 1 second greater than the incoming pulse interval. CSCtx75188
- In a multichassis port channel on a VSS system with a very high number of link up and down events that occur within a second and typically causes an error-disable event, only the ports on the active switch are error-disabled due to flaps.
Workaround: Use the show spi-fc all command to dump all SPI channel information. CSCuc81286
Workaround: None. The ip pim register-rate-limit command does not function. CSCub32679
- Packets that are routed on the same Layer 3 interface (or SVI) that entered on are dropped if received on the VSS standby switch.
Workaround: Enter shut, then no shut to bring up the links. CSCuc37676
- You can attach an input QoS policy to VSL member ports, but you cannot detach it. You only can configure VSL ports.
Workaround: Default the VSL member ports and detach the input QoS policy. CSCuc49150
- When VSS receives a VTP message with information about the creation of 4000 VLANs, traceback and syslog messages (containing EM-4-SEARCH) are displayed.
Workaround: None. You might try reducing the the number of VLANs created at one time.
- For packets with the same ingress and egress Layer 3 interface, ingress QoS marking policy does not work.
Workaround: Turn off ICMP redirect with the ip redirect command. CSCua71929
- On systems performing multicast routing, a brief increase in CPU consumption occurs every few minutes. In large-scale environments, this CPU increase is more noticeable.
- When the Wireshark feature is applied on a control panel, it fails to capture the correct packets as they travel to the CPU in VSS, under the following conditions:
– Incoming packets on the VSS standby port are directed to the CPU for host learning.
– Layer 3 exceptions occur for packets arriving on the VSS standby port.
– ACL logging occurs on the VSS standby port.
- The POST results on the VSS standby switch displayed by the show diagnostic result module all detail command indicate module number 1 rather than 11. The module number is not interpreted by Cisco IOS.
- The following (information-only) error message and traceback may occur during MFIB-to-platform state updates for Bidirectional PIM (*,G/m) entries associated with Bidirectional PIM rendezvous points:
These messages are typically observed during SSO, bootup, or when a PIM-enabled interface undergoes a state transition on a switch containing Bidir PIM state entries.
- The switch may reload unexpectedly or become inaccessible when the integrated web server is used, either through direct web access to the switch, or indirectly through the webauth feature.
Workaround: Enter either the no ip http server or the no ip http secure-server command. This disables the http/s server. CSCui14525
- A GLC-GE-100FX pluggable may not operate when used in WS-X4624-SFP-E, WS-X4640-CSFP-E or WS-X4612-SFP-E modules.
- Following a switchover on VSS, CPU may remain high. The show platform cpu packet statistics command displays high usage due to “SA Miss.”
Workaround: Clear the MAC table. CSCuh50329
- A port configured for webauth is not programmed with the default or fallback ACL when sessions enter the INIT state.
- When a device authenticates with dot1x after authenticating with MAB, any policies applied by MAB remain in place.
– Ensure that the dot1x supplicant always authenticates before MAB.
– Create MAB policies for dot1x hosts that do not supply a URL redirect. CSCui79988
- On a Catalyst 4500 VSS using IOS Release XE 3.4.0SG to 3.4.2SG, or 3.5.0E, the show platform command may be truncated with a "Timed out" message and may rarely produce an unexpected reload. The likelihood of a reload increases if the command is issued over an SSH session or if the output is redirected to a file. The same behavior is observed using IOS Release XE 3.5.0 and the show tech command.
Resolved Caveats for Cisco IOS XE Release 3.4.1SG
This section lists the resolved caveats for Cisco IOS XE Release 3.4.1SG:
- With IGMP snooping enabled, multicast traffic received through a tunnel interface is not forwarded through the Outgoing Interface List.
Workaround: Disable IGMP snooping. CSCuc65538
- When MLD snooping is enabled, control-plane policing on IPv6 ND packets stops working. This does not impact other control packets.
- When a port connected to a CDP, DHCP, or LLDP speaker goes down, a small memory leak occurs (typically less than 300 bytes).
Workaround: Disable these protocols on interfaces that might flap frequently. CSCub85948
- VSS allows you to configure the router MAC address that is used by spanning tree to calculate its bridge ID. When a switchover occurs, this MAC address is retained at the newly active switch. However, the spanning tree bridge ID changes because it uses the local chassis MAC address, instead of the configured router MAC address, to calculate the bridge ID.
Workaround: Ensure that the spanning-tree root is configured in the network. This avoids a topology change. CSCud94151.
- The show inventory command does not display mux buffers information on the local chassis after a switchover although this information is displayed prior to a switchover.
Workaround: Enter the show idprom muxbuffer command to display the missing information. CSCuc79728
- When the VSS active switch is running and the VSS standby switch is booting, ports on the standby switch boot long before the control plane is fully functional. This may cause channel ports on the standby switch to start working in independent mode before the channel ports are bundled.
Workaround: Do not configure LACP independent mode. Because the PAgP does not have a workaround, it may cause a traffic loss of several seconds until the ports are bundled. This situation occurs only when a switch is booting; it does not apply to a port going down and coming up after bootup. CSCud94258.
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to something other then the default, REP packets are not sent on the native VLAN
Workaround: Retain the trunk native VLAN as 1. CSCud05521
- When a session is neither authenticated nor granted fallback authorization (e.g. by entering guest-vlan or auth-fail-vlan) in multi-auth mode, unauthenticated sessions remain indefinitely and are not cleared by the system.
Workaround: Clear sessions manually with the clear authentication sessions command. CSCtg15739
- 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 installed as part of authorization and either of the following occurs, memory will be leaked:
– 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 this 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
- On a switches polled for OIDs under CISCO-PROCESS-MIB and running IOS Release XE 3.3.0SG, 3.3.1SG, 3.3.2SG or 3.4.0SG, the show process memory sorted command displays an increasing memory usage by the eicored process.
Workaround: Exclude polling of the CISCO-PROCESS-MIB using an SNMP view:
- Whenever a S,G entry expires, a switch shows increasing memory utilization in by the MFIB_mrib/read/write process.
Workaround: Minimize leak by avoiding S,G deletion events:
– Extend the receiver-less S,G duration (e.g. ip pim sparse sg-expiry-timer <big value>).
– If sources are varied, try to minimize them.
– If some static sources send infrequently, extend the expiry timer to cover the gaps in the packet stream.
– If some receivers are unreliable, consider static joins.
– Minimize Layer 2 or Layer 3 topology changes that would require multicast reconvergence.
– Avoid manually clearing mroutes. CSCua62262
- A switch running IOS Release XE 3.4.0SG loses all Layer 3 connectivity to or from the switch IP address. Switching is unaffected, but routed IP traffic (snmp, ntp, telnet, ssh, etc.) is affected.
Workaround: Once the problem occurs, reboot the switch.
Disabling Fa1 prevents the problem. CSCue76243
- A switch running IOS Release 3.3.0SG, 3.3.1SG, 3.3.2SG or 3.4.0SG drops some fragmented packets that are routed through the switch. Bridged traffic is unaffected.
- When the Fa1 on a switch running IOS Release XE 3.3.0SG or 3.4.0SG receives a unicast frame whose destination MAC address is not Fa1, traffic is redirected back out of Fa1 instead of being dropped.
- SNMPGET queries for CISCO-PROCESS-MIB fail with the message "No Such Instance currently exists at this OID."
Workaround: Use SNMPWALK. CSCtz67068
- If a switch issues CLI commands at a high rate (usually by script), it crashes with a message like the following:
Workaround: Avoid scripted CLI. CSCtz19897
- If a dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL will be incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- When a session is neither authenticated nor granted fallback authorization (e.g. by entering guest-vlan or auth-fail-vlan) in multi-auth mode, unauthenticated sessions remain indefinitely and are not cleared by the system.
Workaround: Clear sessions manually with the clear authentication sessions command. CSCtg15739
Open Caveats for Cisco IOS XE Release 3.4.0SG
This section lists the open caveats for Cisco IOS XE Release 3.4.0SG:
- When an SNMP query includes the cpmCPUProcessHistoryTable, the query time is very slow, and CPU utilization of the os_info_p process (OS Information provider) increases substantially. The query time of an almost fully populated table is 68 minutes.
- The show ipv6 access-list command displays incorrect match counts when multicast traffic is matched to an IPv6 access list that is attached to an SVI.
- When you configure open authentication and perform SSO, the spanning tree state and MAC address are not synchronized to the new standby supervisor engine. This behavior interrupts traffic only after the second switchover because the new standby supervisor engine possesses the wrong state after the initial switchover and the second switchover starts the port in the blocking state.
Workaround: Enter shut and no shut on the port to synchronize the STP state. CSCtf52437
- If you reboot a switch, the configured value of the interface MTU size for the elements of the port channel interface is invalid for IPv6 traffic.
Workaround: After a switch reloads, enter shut and no shut on the port-channel interface.
Workaround: Increase the queue limit to at least 256. CSCto57602
- A device in a guest VLAN that is connected behind a phone capable of 2nd-port-notification experiences packet loss following a SSO failover. The device experiences an authentication restart after the first CDP frame arrives from the phone.
- If you perform an OIR on a line card, several %C4K_RKNOVA-4-INVALIDTOKENEXPIRED messages appear in the logs.
- When you enable both Cisco TrustSec and RADIUS accounting, a disparity occurs between the RADIUS client (Cisco switch) and the RADIUS/CTS server in how the authenticator field in the header is computed for DOT1X/RADIUS accounting messages.
A Cisco IOS AAA client uses the PAC secret to compute the authenticator; Cisco Secure ACS 5.2 uses the shared secret. This behavior causes a mismatch that results in a rejection of the accounting message, and the client marks the server as unresponsive.
Workaround: None. You must disable 802.1X accounting. CSCts26844
- When more than one Equal Cost Multipath (ECMP) is available on the downstream switch, and Mediatrace is invoked to provide flow statistics, the dynamic policy does not display flow statistics.
Mediatrace cannot find the correct inbound interface and applies the dynamic policy on a different interface from the one used for media flow.
- When a switchover is created on the Mediatrace responder, the dynamic access list created for a monitored flow tuple is not deleted. Although the Mediatrace initiator creates another set of dynamic access lists after the switchover, the old ones remain in the configuration.
Stale dynamic access lists force the system to monitor unwanted traffic.
– If the switchover is scheduled, remove the scheduled session on the initiator, and reschedule the session after the new active supervisor engine boots on the responder.
– After the new active supervisor engine boots, and provided the Mediatrace responder SSO is not planned, manually delete the stale dynamic access lists. CSCty75070
- When you add a "bfd" suffix to the snmp server host x.x.x.x configuration command, the BFD traps, ciscoBfdSessUp and ciscoBfdSessDown, are not generated.
Workaround: Do not specify a "bfd" suffix with the snmp-server host x.x.x.x configuration command. CSCtx51561
- When MLD Snooping is disabled, a Catalyst 4500-X switch cannot maintain 6,000 MLD joins, causing traffic loss due to missing outgoing interfaces.
Workaround: Enable MLD snooping. CSCtx82176
- During either a system- or user-initiated reload operation, the following message is observed when the system shuts down:
This message is not observed during a system bootup.
Workaround: None required. This message is information only. CSCtz15738
- When a Catalyst 4500-X uplink module is removed incorrectly, hardware forwarding tables are frozen, and baseboard ports remain connected for 20 to 25 seconds.
Workaround: Remove the Catalyst 4500-X module by first pressing the Ejector button for 10 seconds until the light turns green. CSCty67871
Caution: If you remove the module without following this procedure, the system always shuts down (or fails). Always use the Ejector button.
- For the 10-Gigabit interface on a Catalyst 4500-X switch, link flaps are observed if the debounce interval is defined with the link debounce time command to within 1 second of the pulse interval.
For example, if the pulse interval is 250 ms and the debounce interval is 500 ms, then the delta is 250 ms and the debounce is ineffective.
Workaround: Define a debounce interval that is at least 1 second greater than the incoming pulse interval. CSCtx75188
- In a multichassis port channel on a VSS system with a very high number of link up and down events that occur within a second and typically causes an error-disable event, only the ports on the active switch are error-disabled due to flaps.
Workaround: Use the show spi-fc all command to dump all SPI channel information. CSCuc81286
Workaround: None. The ip pim register-rate-limit command does not function. CSCub32679
- Packets that are routed on the same Layer 3 interface (or SVI) that entered on are dropped if received on the VSS standby switch.
Workaround: Enter shut, then no shut to bring up the links. CSCuc37676
- You can attach an input QoS policy to VSL member ports, but cannot detach it. You only can configure VSL ports.
Workaround: Default the VSL member ports and detach the input QoS policy. CSCuc49150
- When VSS receives a VTP message with information about the creation of 4000 VLANs, traceback and syslog messages (containing EM-4-SEARCH) are displayed.
Workaround: None. Reduce the number of VLANs created at one time.
- For packets with the same ingress and egress Layer 3 interface, ingress QoS marking policy does not work.
Workaround: Turn off ICMP redirect with the ip redirect command. CSCua71929
- On systems performing multicast routing, a brief increase in CPU consumption occurs every few minutes. In large-scale environments, this CPU increase is more noticeable.
- When the Wireshark feature is applied on a control panel, it fails to capture the correct packets as they travel to the CPU in VSS, under the following conditions:
– Incoming packets on the VSS standby port are directed to the CPU for host learning.
– Layer 3 exceptions occur for packets arriving on the VSS standby port.
– ACL logging occurs on the VSS standby port.
- The POST results on the VSS standby switch displayed by the show diagnostic result module all detail command indicate module number 1 rather than 11. The module number is not interpreted by Cisco IOS.
- The show inventory command does not display mux buffers information on the local chassis after a switchover although this information is displayed prior to a switchover.
Workaround: Enter the show idprom muxbuffer command to display the missing information. CSCuc79728
- The following (information-only) error message and traceback may occur during MFIB-to-platform state updates for Bidirectional PIM (*,G/m) entries associated with Bidirectional PIM rendezvous points:
These messages are typically observed during SSO, bootup, or when a PIM-enabled interface undergoes a state transition on a switch containing Bidir PIM state entries.
- When MLD snooping is enabled, control-plane policing on IPv6 ND packets stops working. This does not impact other control packets.
- When a port connected to a CDP, DHCP, or LLDP speaker goes down, a small memory leak occurs (typically less than 300 bytes).
Workaround: Disable these protocols on interfaces that might flap frequently. CSCub85948
- VSS allows you to configure the router MAC address that is used by spanning tree to calculate its bridge ID. When a switchover occurs, this MAC address is retained at the newly active switch. However, the spanning tree bridge ID changes because it uses the local chassis MAC address, instead of the configured router MAC address, to calculate the bridge ID.
Workaround: Ensure that the spanning-tree root is configured in the network. This avoids a topology change. CSCud94151.
- When the VSS active switch is running and the VSS standby switch is booting, ports on the standby switch boot long before the control plane is fully functional. This may cause channel ports on the standby switch to start working in independent mode before the channel ports are bundled.
Workaround: Do not configure LACP independent mode. Because the PAgP does not have a workaround, it may cause a traffic loss of several seconds until the ports are bundled. This situation occurs only when a switch is booting; it does not apply to a port going down and coming up after bootup. CSCud94258.
- If REP is configured on a dot1q trunk and the native VLAN is administratively set to something other then the default, REP packets are not sent on the native VLAN
Workaround: Retain the trunk native VLAN as 1. CSCud05521
- When a session is neither authenticated nor granted fallback authorization (e.g. by entering guest-vlan or auth-fail-vlan) in multi-auth mode, unauthenticated sessions remain indefinitely and are not cleared by the system.
Workaround: Clear sessions manually with the clear authentication sessions command. CSCtg15739
- 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 installed as part of authorization and either of the following occurs, memory will be leaked:
– 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 this 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 dACL name is too long (about 24 characters, depending on the interface where it is applied), the ACL will be incorrectly shared over multiple ports.
Workaround: Shorten the dACL name. CSCug78653
- With IGMP snooping enabled, multicast traffic received through a tunnel interface is not forwarded through the Outgoing Interface List.
Workaround: Disable IGMP snooping. CSCuc65538
- On a switches polled for OIDs under CISCO-PROCESS-MIB and running IOS Release XE 3.3.0SG, 3.3.1SG, 3.3.2SG or 3.4.0SG, the show process memory sorted command displays an increasing memory usage by the eicored process.
Workaround: Exclude polling of the CISCO-PROCESS-MIB using an SNMP view:
- Whenever a S,G entry expires, a switch shows increasing memory utilization in by the MFIB_mrib/read/write process.
Workaround: Minimize leak by avoiding S,G deletion events:
– Extend the receiver-less S,G duration (e.g. ip pim sparse sg-expiry-timer <big value>).
– If sources are varied, try to minimize them.
– If some static sources send infrequently, extend the expiry timer to cover the gaps in the packet stream.
– If some receivers are unreliable, consider static joins.
– Minimize Layer 2 or Layer 3 topology changes that would require multicast reconvergence.
– Avoid manually clearing mroutes. CSCua62262
- A switch running IOS Release XE 3.4.0SG loses all Layer 3 connectivity to or from the switch IP address. Switching is unaffected, but routed IP traffic (snmp, ntp, telnet, ssh, etc.) is affected.
Workaround: Once the problem occurs, reboot the switch.
Disabling Fa1 prevents the problem. CSCue76243
- A switch running IOS Release 15.1(1)SG, 15.1(1)SG1, 15.1(1)SG2, or 15.1(2)SG, drops some fragmented packets that are routed through the switch. Bridged traffic is unaffected.
- When the Fa1 on a switch running IOS Release XE 3.3.0SG or 3.4.0SG receives a unicast frame whose destination MAC address is not Fa1, traffic is redirected back out of Fa1 instead of being dropped.
- SNMPGET queries for CISCO-PROCESS-MIB fail with the message "No Such Instance currently exists at this OID."
Workaround: Use SNMPWALK. CSCtz67068
- If a switch issues CLI commands at a high rate (usually by script), it crashes with a message like the following:
Workaround: Avoid scripted CLI. CSCtz19897
- A GLC-GE-100FX pluggable may not operate when used in WS-X4624-SFP-E, WS-X4640-CSFP-E or WS-X4612-SFP-E modules.
- Following a switchover on VSS, CPU may remain high. The show platform cpu packet statistics command displays high usage due to “SA Miss.”
Workaround: Clear the MAC table. CSCuh50329
- On a Catalyst 4500 VSS using IOS Release XE 3.4.0SG to 3.4.2SG, or 3.5.0E, the show platform command may be truncated with a "Timed out" message and may rarely produce an unexpected reload. The likelihood of a reload increases if the command is issued over an SSH session or if the output is redirected to a file. The same behavior is observed using IOS Release XE 3.5.0 and the show tech command.
Resolved Caveats for Cisco IOS XE Release 3.4.0SG
This section lists the resolved caveats for Cisco IOS XE Release 3.4.0SG:
- Dynamic ACLs do not function correctly if they have advanced operators, including dscp/ipp/tos, log/log-input, fragments, and TCP flag operators.
Workaround: Remove these operators from any dynamic ACLs. CSCts05302
- A peer policy is not updated after reauthentication if the policy is changed on the AS beforehand. After reauthentication, the original peer policy is retained.
Workaround: Enter shut, then no shut on the port. CSCts29515
- A WS-C4500-X Series switch will fail when you use the switchport command to convert ports from Layer 3 to Layer 2, if the former is configured with IPv4 and IPv6 ACLs (each with 500 ACEs).
Workaround: Enter the default interface te command in global configuration mode before you enter the switchport command. CSCty52629
- A Catalyst 4500-X switch fails if you enter show memory debug leak on the console executing show memory detailed process iosd debug leaks from another Telnet session.
Workaround: Avoid running both commands simultaneously. CSCty27680
Related Documentation
Refer to the following documents for additional Catalyst 4500-X series information:
http://www.cisco.com//en/US/products/ps12332/index.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/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/ps12332/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/ps12332/prod_release_notes_list.html
Software documents for the Catalyst 4500 Classic, Catalyst 4500 E-Series, Catalyst 4900 Series, and Catalyst 4500-X Series 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
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 and/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 and/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 “Notices” section.
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