Chapter 1. Release Notes for Catalyst 2960-C and 2960-Plus Switches, Cisco IOS Release 15.2(7)Ex

Cisco IOS Release 15.2(7)Ex runs on Catalyst 2960-C and 2960-Plus switches and on Cisco EtherSwitch service modules.

These release notes include important information about Cisco IOS Release 15.2(7)Ex, any limitations, restrictions, and caveats that apply to the releases. Verify that these release notes are correct for your switch:

- If you are installing a new switch, see the Cisco IOS release label on the rear panel of your switch.

- If your switch is on, use the show version privileged EXEC command. See the section “Finding the Software Version and Feature Set”.

- If you are upgrading to a new release, see the software upgrade filename for the software version. See the section “Deciding Which Files to Use”.

You can download the switch software from this site (registered Cisco.com users with a login password):https://software.cisco.com/download/home

- Contents

- System Requirements

- Upgrading the Switch Software

- Installation Notes

- New Features

- Minimum Cisco IOS Release for Major Features

- Limitations and Restrictions

- Important Notes

- Caveats

- Related Documentation

- Obtaining Documentation and Submitting a Service Request

Contents

System Requirements

- Hardware Requirements

- Software Requirements

- Cluster Compatibility

- CNA Compatibility

Hardware Requirements

Minimum Hardware Requirements

Processor Speed

DRAM

Number of Colors

Resolution

Font Size

233 MHz minimum

Note

We recommend 1 GHz.

512 MB

Note

We recommend 1 GB DRAM.

256

1024 x 768

Small

Software Requirements

- Windows 2000, XP, Vista, and Windows Server 2003.

- Internet Explorer 6.0 or 7.0, and Firefox up to version 27, with JavaScript enabled.

The device manager verifies the browser version when starting a session and does not require a plug-in.

Cluster Compatibility

You cannot create and manage switch clusters through the device manager. To create and manage switch clusters, use the CLI or the Network Assistant application.

When creating a switch cluster or adding a switch to a cluster, follow these guidelines:

- When you create a switch cluster, we recommend configuring the highest-end switch in your cluster as the command switch.

- If you are managing the cluster through Network Assistant, the switch with the latest software should be the command switch.

- The standby command switch must be the same type as the command switch. For example, if the command switch is a Catalyst 2960-C switch, all standby command switches must be Catalyst 2960-C switches.

For additional information about clustering, see Getting Started with Cisco Network Assistant and Release Notes for Cisco Network Assistant (not orderable but available on Cisco.com), the software configuration guide, the command reference, and the Cisco EtherSwitch service module feature guide.

CNA Compatibility

Cisco IOS Release 15.2(7)E and later is only compatible with Cisco Network Assistant (CNA) 5.0 and later. You can download Cisco Network Assistant from this URL: https://www.cisco.com/c/en/us/support/cloud-systems-management/network-assistant-version-5-0/model.html#%7Etab-downloads

For more information about Cisco Network Assistant, see the Release Notes for Cisco Network Assistant on Cisco.com.

Upgrading the Switch Software

- Finding the Software Version and Feature Set

- Deciding Which Files to Use

- Archiving Software Images

- Upgrading a Switch by Using the Device Manager or Network Assistant

- Upgrading a Switch by Using the CLI

- Web UI

Finding the Software Version and Feature Set

The Cisco IOS image is stored as a bin file in a directory that is named with the Cisco IOS release. A subdirectory contains the files needed for web management. The image is stored on the system board flash device (flash:).

You can use the show version privileged EXEC command to see the software version that is running on your switch. The second line of the display shows the version.

You can also use the dir filesystem: privileged EXEC command to see the directory names of other software images that you might have stored in flash memory.

Deciding Which Files to Use

The upgrade procedures in these release notes describe how to perform the upgrade by using a combined tar file. This file contains the Cisco IOS image file and the files needed for the embedded device manager. You must use the combined tar file to upgrade the switch through the device manager. To upgrade the switch through the CLI, use the tar file and the archive download-sw privileged EXEC command.

Cisco IOS Software Image Files

Filename

Description

c2960-lanbasek9-mz.152-7.E.bin

Catalyst 2960-C image with all supported LanBase image features and Web-based device manager.

c2960-lanbasek9-tar.152-7.E.tar

Catalyst 2960-C image with all supported LanBase image features and Web-based device manager.

c2960-lanlitek9-mz.152-7.E.bin

Catalyst 2960-C image with all supported LanLite image features and Web-based device manager.

c2960-lanlitek9-tar.152-7.E.tar

Catalyst 2960-C image with all supported LanLite image features and Web-based device manager.

c2960c405-universalk9-mz.152-7.E.bin

Catalyst 2960-C image with all supported universal image features and Web-based device manager.

c2960c405-universalk9-tar.152-7.E.tar

Catalyst 2960-C image with all supported universal image features and Web-based device manager.

Archiving Software Images

Before upgrading your switch software, make sure that you have archived copies of the current Cisco IOS release and the Cisco IOS release to which you are upgrading. You should keep these archived images until you have upgraded all devices in the network to the new Cisco IOS image and until you have verified that the new Cisco IOS image works properly in your network.

Cisco routinely removes old Cisco IOS versions from Cisco.com. See Product Bulletin 2863 for more information: http://www.cisco.com/en/US/prod/collateral/iosswrel/ps8802/ps6969/ps1835/prod_bulletin0900aecd80281c0e.html

You can copy the bin software image file on the flash memory to the appropriate TFTP directory on a host by using the copy flash: tftp: privileged EXEC command.

Note

Although you can copy any file on the flash memory to the TFTP server, it is time consuming to copy all of the HTML files in the tar file. We recommend that you download the tar file from Cisco.com and archive it on an internal host in your network.

You can also configure the switch as a TFTP server to copy files from one switch to another without using an external TFTP server by using the tftp-server global configuration command. For more information about the tftp-server command, see the “Basic File Transfer Services Commands” section of the Cisco IOS Configuration Fundamentals Command Reference, Release 12.2: http://www.cisco.com/en/US/docs/ios/fundamentals/command/reference/cf_t1.html

Upgrading a Switch by Using the Device Manager or Network Assistant

You can upgrade switch software by using the device manager or Network Assistant. For detailed instructions, click Help.

Note

When using the device manager to upgrade your switch, do not use or close your browser session after the upgrade process begins. Wait until after the upgrade process completes.

Upgrading a Switch by Using the CLI

This procedure is for copying the combined tar file to the switch. You copy the file to the switch from a TFTP server and extract the files. You can download an image file and replace or keep the current image.

To download software, follow these steps:

1. Use Table 3 to identify the file that you want to download.

2. Download the software image file:

1. If you are a registered customer, go to this URL and log in.

http://www.cisco.com/cisco/web/download/index.html

2. Navigate to Switches > LAN Switches - Access.

3. Navigate to your switch model.

4. Click IOS Software, then select the latest IOS release.

Download the image you identified in Step 1.

3. Copy the image to the appropriate TFTP directory on the workstation, and make sure that the TFTP server is properly configured.

For more information, see Appendix B in the software configuration guide for this release.

4. Log into the switch through the console port or a Telnet session.

5. (Optional) Ensure that you have IP connectivity to the TFTP server by entering thisprivileged EXEC command:

Switch# ping tftp-server address

For more information about assigning an IP address and default gateway to the switch, see the software configuration guide for this release.

6. Download the image file from the TFTP server to the switch. If you are installing the same version of software that is currently on the switch, overwrite the current image by entering this privileged EXEC command:

Switch# archive download-sw /overwrite /reload tftp:[[//location]/directory]/image-name.tar

The /overwrite option overwrites the software image in flash memory with the downloaded one.

The /reload option reloads the system after downloading the image unless the configuration has been changed and not saved.

The /allow-feature-upgrade option allows installation of an image with a different feature set (for example, upgrade from the IP base image to the IP services image).

For // location, specify the IP address of the TFTP server.

For / directory / image-name .tar, specify the directory (optional) and the image to download. Directory and image names are case sensitive.

This example shows how to download an image from a TFTP server at 198.30.20.19 and to overwrite the image on the switch:

Switch# archive download-sw /overwrite tftp://198.30.20.19/c3750-ipservices-tar.122-50.SE.tar

You can also download the image file from the TFTP server to the switch and keep the current image by replacing the /overwrite option with the /leave-old-sw option.

Web UI

If the Web UI does not load or work properly after the software upgrade, perform the following steps:

1. Specify the authentication method for HTTP server users as local.

Device(config)# ip http authentication local

2. Configure the username and password with privilege 15.

Device(config)# username user privilege 15 password password

3. Clear the browser cache and relaunch the Web UI.

4. Login by entering the privilege 15 username and password.

Installation Notes

Use these methods to assign IP information to your switch:

- The Express Setup program, as described in the switch getting started guide.

- The CLI-based setup program, as described in the switch hardware installation guide.

- The DHCP-based autoconfiguration, as described in the switch software configuration guide.

- Manually assigning an IP address, as described in the switch software configuration guide.

New Features

New Features in Cisco IOS Release 15.2(7)E1

- None

New Features in Cisco IOS Release 15.2(7)E2

- None

New Features in Cisco IOS Release 15.2(7)E3

- None

New Features in Cisco IOS Release 15.2(7)E4

- None

New Features in Cisco IOS Release 15.2(7)E5

- None

New Features in Cisco IOS Release 15.2(7)E6

- None

New Features in Cisco IOS Release 15.2(7)E7

- Data Sanitization: Supports the use of the National Institute of Standards and Technology (NIST) purge method that renders data unrecoverable through simple, non-invasive data recovery techniques or through state-of-the-art laboratory techniques.

For more information, see the "Data Sanitization" chapter of the System Management Configuration Guide.

New Features in Cisco IOS Release 15.2(7)E8

- None

New Features in Cisco IOS Release 15.2(7)E9

- None

New Features in Cisco IOS Release 15.2(7)E10

- None

Minimum Cisco IOS Release for Major Features

The following table lists the minimum software release required to support the major features of the Catalyst 2960-C and 2960-Plus switches and the Cisco EtherSwitch service modules.

Catalyst 2960-C and 2960-Plus Switches, and the Minimum Cisco IOS Release Required

Feature

Minimum Cisco IOS Release Required

Catalyst Switch Support

Cisco TrustSec SXP version 2, syslog messages, and SNMP support

Cisco IOS Release 15.0(2)SE

3560-C, 2960-S, 2960-C

Critical voice VLAN

Cisco IOS Release 15.0(1)SE

2960-S

NEAT enhancement to control access to the supplicant port

Cisco IOS Release 15.0(1)SE

2960-S

Auto Smartports improved device classification

Cisco IOS Release 15.0(1)SE

2960-S

EnergyWise Phase 2.5

Cisco IOS Release 12.2(58)SE1

2960-S

Protocol storm protection

Cisco IOS Release 12.2(58)SE1

2960-S

Smart Install 3.0

Cisco IOS Release 12.2(58)SE1

2960-S

Auto Smartports enhancements to enable auto-QoS on a digital media player

Cisco IOS Release 12.2(58)SE1

2960-S

Memory consistency check routines

Cisco IOS Release 12.2(58)SE1

2960-S

Call Home support

Cisco IOS Release 12.2(58)SE1

2960-S

NTP version 4

Cisco IOS Release 12.2(58)SE1

2960-S

RADIUS, TACACS+, and SSH/SCP over IPv6

Cisco IOS Release 12.2(58)SE1

2960-S

IETF IP-MIB and IP-FORWARD-MIB(RFC4292 and RFC4293) updates

Cisco IOS Release 12.2(58)SE1

2960-S

Auto-QoS enhancements

Cisco IOS Release 12.2(55)SE

2960-S

Auto Smartport enhancements including global macros

Cisco IOS Release 12.2(55)SE

2960-S

Smart Install enhancements and new features

Cisco IOS Release 12.2(55)SE

2960-S

Port ACL improvements

Cisco IOS Release 12.2(55)SE

2960-S

Cisco Discovery Protocol and LLDP location enhancements

Cisco IOS Release 12.2(55)SE

2960-S

Multi-authentication with VLAN assignment

Cisco IOS Release 12.2(55)SE

2960-S

Static routing support on SVIs

Cisco IOS Release 12.2(55)SE

2960-S

MAC replace to end a session when a host disconnects from a port.

Cisco IOS Release 12.2(55)SE

2960-S

DHCP snooping and Option 82 and LLPD-MED in LAN lite image

Cisco IOS Release 12.2(55)SE

2960-S

Limitations and Restrictions

You should review this section before you begin working with the switch. These are known limitations that will not be fixed, and there is not always a workaround. Some features might not work as documented, and some features could be affected by recent changes to the switch hardware or software.

- Cisco IOS Limitations

- Device Manager Limitations

Cisco IOS Limitations

- Configuration

- Ethernet

- HSRP

- IP

- IP Telephony

- Power

- QoS

- RADIUS

- Smart Install

- SPAN and RSPAN

- Spanning Tree Protocol

- Trunking

- VLAN

Configuration

- When connected to some third-party devices that send early preambles, a switch port operating at 100 Mb/s full duplex or 100 Mb/s half duplex might bounce the line protocol up and down. The problem is observed only when the switch is receiving frames.

The workaround is to configure the port for 10 Mb/s and half duplex or to connect a hub or a nonaffected device to the switch. (CSCed39091)

- When port security is enabled on an interface in restricted mode and the switchport block unicast interface command has been entered on that interface, MAC addresses are incorrectly forwarded when they should be blocked.

The workaround is to enter the no switchport block unicast interface configuration command on that specific interface. (CSCee93822)

- A traceback error occurs if a crypto key is generated after an SSL client session.

There is no workaround. This is a cosmetic error and does not affect the functionality of the switch. (CSCef59331)

- The far-end fault optional facility is not supported on the GLC-GE-100FX SFP module.

The workaround is to configure aggressive UDLD. (CSCsh70244).

- A ciscoFlashMIBTrap message appears during switch startup. This does not affect switch functionality. (CSCsj46992)

- When you enter the boot host retry timeout global configuration command to specify the amount of time that the client should keep trying to download the configuration and you do not enter a timeout value, the default value is zero, which should mean that the client keeps trying indefinitely. However, the client does not keep trying to download the configuration.

The workaround is to always enter a non zero value for the timeout value when you enter the boot host retry timeout timeout-value command. (CSCsk65142)

- When authorization and accounting are enabled on the switch and you use the interface range command to change the configuration on a range of interfaces, the change might cause high CPU utilization and authentication failures.

The workaround is to disable authorization and accounting or to enter the configuration change for one interface at a time. (CSCsg80238, CSCti76748)

- When a logging discriminator is configured and applied to a device, memory leak is seen under heavy syslog or debug output. The rate of the leak is dependent on the quantity of logs produced. In extreme cases, the device may crash. As a workaround, disable the logging discriminator on the device. (CSCur45606, CSCur28336)

Ethernet

- Traffic on EtherChannel ports is not perfectly load-balanced. Egress traffic on EtherChannel ports are distributed to member ports on load balance configuration and traffic characteristics like MAC or IP address. More than one traffic stream may map to same member ports based on hashing results calculated by the ASIC.

If this happens, uneven traffic distribution will happen on EtherChannel ports.

Changing the load balance distribution method or changing the number of ports in the EtherChannel can resolve this problem. Use any of these workarounds to improve EtherChannel load balancing:

- For random source-ip and dest-ip traffic, configure load balance method as src-dst-ip

- For random source-ip and dest-ip traffic, configure load balance method as src-dst-ip

- For incrementing source-ip traffic, configure load balance method as src-ip

- For incrementing dest-ip traffic, configure load balance method as dst-ip

- Configures the number of ports in the EtherChannel so that the number is equal to a power of 2 (that is 2, 4, or 8)

For example, with load balance configured as dst-ip with 150 distinct incrementing destination IP addresses, and the number of ports in the EtherChannel set to either 2, 4, or 8, load distribution is optimal.(CSCeh81991)

HSRP

- When the active switch fails in a switch cluster that uses HSRP redundancy, the new active switch might not contain a full cluster member list.

The workaround is to ensure that the ports on the standby cluster members are not in the spanning-tree blocking state. To verify that these ports are not in the blocking state, see the “Configuring STP” chapter in the software configuration guide. (CSCec76893)

IP

- When the rate of received DHCP requests exceeds 2,000 packets per minute for a long time, the response time might be slow when you are using the console.

The workaround is to use rate limiting on DHCP traffic to prevent a denial of service attack from occurring. (CSCeb59166)

IP Telephony

- After you change the access VLAN on a port that has IEEE 802.1x enabled, the IP phone address is removed. Because learning is restricted on IEEE 802.1x-capable ports, it takes approximately 30 seconds before the address is relearned.

No workaround is necessary. (CSCea85312)

- Some access point devices are incorrectly discovered as IEEE 802.3af Class 1 devices. These access points should be discovered as Cisco pre-standard devices. The show power inline user EXEC command shows the access point as an IEEE Class 1 device.

The workaround is to power the access point by using an AC wall adaptor. (CSCin69533)

- The Cisco 7905 IP Phone is error-disabled when the phone is connected to wall power.

The workaround is to enable PoE and to configure the switch to recover from the PoE error-disabled state. (CSCsf32300)

- If the number of multicast routes and Internet Group Management Protocol (IGMP) groups are more than the maximum number specified by the show sdm prefef global configuration command, the traffic received on unknown groups is flooded in the received VLAN even though the show ip igmp snooping multicast-table privileged EXEC command output shows otherwise.

The workaround is to reduce the number of multicast routes and IGMP snooping groups to less than the maximum supported value. (CSCdy09008)

- IGMP filtering is applied to packets that are forwarded through hardware. It is not applied to packets that are forwarded through software. Hence, with multicast routing enabled, the first few packets are sent from a port even when IGMP filtering is set to deny those groups on that port.

There is no workaround. (CSCdy82818)

- If an IGMP report packet has two multicast group records, the switch removes or adds interfaces depending on the order of the records in the packet:

- If the ALLOW_NEW_SOURCE record is before the BLOCK_OLD_SOURCE record, the switch removes the port from the group.

- If the BLOCK_OLD_SOURCE record is before the ALLOW_NEW_SOURCE record, the switch adds the port to the group.

There is no workaround. (CSCec20128)

- When IGMP snooping is disabled and you enter the switchport block multicast interface configuration command, IP multicast traffic is not blocked.

The switchport block multicast interface configuration command is only applicable to non-IP multicast traffic.

There is no workaround. (CSCee16865)

- Incomplete multicast traffic can be seen under either of these conditions:

- You disable IP multicast routing or re-enable it globally on an interface.

- A switch mroute table temporarily runs out of resources and recovers later.

The workaround is to enter the clear ip mroute privileged EXEC command on the interface. (CSCef42436)

After you configure a switch to join a multicast group by entering the ip igmp join-group group-address interface configuration command, the switch does not receive join packets from the client, and the switch port connected to the client is removed from the IGMP snooping forwarding table.

Use one of these workarounds:

- Cancel membership in the multicast group by using the no ip igmp join-group group-address interface configuration command on an SVI.

- Disable IGMP snooping on the VLAN interface by using the no ip igmp snooping vlan vlan-id global configuration command. (CSCeh90425)

Power

- Entering the shutdown and the no shutdown interface configuration commands on the internal link can disrupt the PoE operation. If a new IP phone is added while the internal link is in shutdown state, the IP phone does not get inline power if the internal link is brought up within 5 minutes.

The workaround is to enter the shutdown and the no shutdown interface configuration commands on the Fast Ethernet interface of a new IP phone that is attached to the service module port after the internal link is brought up. (CSCeh45465)

QoS

- Some switch queues are disabled if the buffer size or threshold level is set too low with the mls qos queue-set output global configuration command. The ratio of buffer size to threshold level should be greater than 10 to avoid disabling the queue.

The workaround is to choose compatible buffer sizes and threshold levels. (CSCea76893)

- When auto-QoS is enabled on the switch, priority queuing is not enabled. Instead, the switch uses shaped round robin (SRR) as the queuing mechanism. The auto-QoS feature is designed on each platform based on the feature set and hardware limitations, and the queuing mechanism supported on each platform might be different. There is no workaround. (CSCee22591)

- If you configure a large number of input interface VLANs in a class map, a traceback message similar to this might appear:

01:01:32: %BIT-4-OUTOFRANGE: bit 1321 is not in the expected range of 0 to 1024

There is no impact to switch functionality.

There is no workaround. (CSCtg32101)

RADIUS

- RADIUS change of authorization (COA) reauthorization is not supported on the critical auth VLAN.

There is no workaround. (CSCta05071)

Smart Install

- When upgrading switches in a stack, the director cannot send the correct image and configuration to the stack if all switches in the stack do not start at the same time. A switch in the stack could then receive an incorrect image or configuration.

The workaround is to use an on-demand upgrade to upgrade switches in a stack by entering the vstack download config and vstack download image commands. (CSCta64962)

- When you upgrade a Smart Install director to Cisco IOS Release 12.2(55)SE but do not upgrade the director configuration, the director cannot upgrade client switches.

When you upgrade the director to Cisco IOS Release 12.2(55)SE, the workaround is to also modify the configuration to include all built-in, custom, and default groups. You should also configure the tar image name instead of the image-list file name in the stored images. (CSCte07949)

- Backing up a Smart Install configuration could fail if the backup repository is a Windows server and the backup file already exists in the server.

The workaround is to use the TFTP utility of another server instead of a Windows server or to manually delete the existing backup file before backing up again. (CSCte53737)

- In a Smart Install network, when the director is connected between the client and the DHCP server and the server has options configured for image and configuration, then the client does not receive the image and configuration files sent by the DHCP server during an automatic upgrade. Instead the files are overwritten by the director and the client receives the image and configuration that the director sends.

Use one of these workarounds:

- If client needs to upgrade using an image and configuration file configured in the DHCP server options, you should remove the client from the Smart Install network during the upgrade.

- In a network using Smart Install, you should not configure options for image and configuration in the DHCP server. For clients to upgrade using Smart Install, you should configure product-id specific image and configuration files in the director. (CSCte99366)

- If the director in the Smart Install network is located between an access point and the DHCP server, the access point tries to use the Smart Install feature to upgrade even though access points are not supported devices. The upgrade fails because the director does not have an image and configuration file for the access point.

There is no workaround. (CSCtg98656)

- When a Smart Install director is upgrading a client switch that is not Smart Install-capable (that is, not running Cisco IOS Release 12.2(52)SE or later), the director must enter the password configured on the client switch. If the client switch does not have a configured password, there are unexpected results depending on the software release running on the client:

- When you select the NONE option in the director CLI, the upgrade should be allowed and is successful on client switches running Cisco IOS Release 12.2(25)SE through 12.2(46)SE, but fails on clients running Cisco IOS Release 12.2(50)SE through 12.2(50)SEx.

- When you enter any password in the director CLI, the upgrade should not be allowed, but it is successful on client switches running Cisco IOS Release 12.2(25)SE through 12.2(46)SE, but fails on clients running Cisco IOS Release 12.2(50)SE through 12.2(50)SEx.

There is no workaround. (CSCth35152)

SPAN and RSPAN

- When the RSPAN feature is configured on a switch, Cisco Discovery Protocol packets received from the RSPAN source ports are tagged with the RSPAN VLAN ID and forwarded to trunk ports carrying the RSPAN VLAN. When this happens a switch that is more than one hop away incorrectly lists the switch that is connected to the RSPAN source port as a Cisco Discovery Protocol neighbor.

This is a hardware limitation. The workaround is to disable Cisco Discovery Protocol on all interfaces carrying the RSPAN VLAN on the device connected to the switch. (CSCeb32326)

- Cisco Discovery Protocol, VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP) packets received from a SPAN source are not sent to the destination interfaces of a local SPAN session. The workaround is to use the monitor session session_number destination {interface interface-id encapsulation replicate} global configuration command for local SPAN. (CSCed24036)

Spanning Tree Protocol

- When a switch or switch stack running Multiple Spanning Tree (MST) is connected to a switch running Rapid Spanning Tree Protocol (RSTP), the MST switch acts as the root bridge and runs per-VLAN spanning tree (PVST) simulation mode on boundary ports connected to the RST switch. If the allowed VLAN on all trunk ports connecting these switches is changed to a VLAN other than VLAN 1 and the root port of the RSTP switch is shut down and then enabled, the boundary ports connected to the root port move immediately to the forward state without going through the PVST+ slow transition. (CSCtl60247)

There is no workaround.

Trunking

- IP traffic with IP options set is sometimes leaked on a trunk port. For example, a trunk port is a member of an IP multicast group in VLAN X but is not a member in VLAN Y. If VLAN Y is the output interface for the multicast route entry assigned to the multicast group and an interface in VLAN Y belongs to the same multicast group, the IP-option traffic received on an input VLAN interface other than one in VLAN Y is sent on the trunk port in VLAN Y because the trunk port is forwarding in VLAN Y, even though the port has no group membership in VLAN Y.

There is no workaround. (CSCdz42909).

- For trunk ports or access ports configured with IEEE 802.1Q tagging, inconsistent statistics might appear in the show interfaces counters privileged EXEC command output. Valid IEEE 802.1Q frames of 64 to 66 bytes are correctly forwarded even though the port LED blinks amber, and the frames are not counted on the interface statistics.

There is no workaround. (CSCec35100).

VLAN

- If the number of VLANs times the number of trunk ports exceeds the recommended limit of 13,000, the switch can fail.

The workaround is to reduce the number of VLANs or trunks. (CSCeb31087)

- When line rate traffic is passing through a dynamic port, and you enter the switchport access vlan dynamic interface configuration command for a range of ports, the VLANs might not be assigned correctly. One or more VLANs with a null ID appears in the MAC address table instead.

The workaround is to enter the switchport access vlan dynamic interface configuration command separately on each port. (CSCsi26392)

- When many VLANs are configured on the switch, high CPU utilization occurs when many links are flapping at the same time.
The workaround is to remove unnecessary VLANs to reduce CPU utilization when many links are flapping. (CSCtl04815)

Device Manager Limitations

- When you are prompted to accept the security certificate and you click No, you only see a blank screen, and the device manager does not launch.

The workaround is to click Yes when you are prompted to accept the certificate. (CSCef45718)

Important Notes

- Switch Stack Notes

- Cisco IOS Notes

- Device Manager Notes

Switch Stack Notes

- Always power off a switch before adding or removing it from a switch stack.

Cisco IOS Notes

- In Cisco IOS Release 15.2(7)E3 and later releases, SSH is enabled by default to connect to networks, and Telnet is disabled by default.

- If the 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:

00:02:57: %RADIUS-4-RADIUS_DEAD: RADIUS server 172.20.246.206:1645,1646 is not responding.

If this message appears, check that there is network connectivity between the switch and the ACS. You should also check that the switch has been properly configured as an AAA client on the ACS

- If the switch has interfaces with automatic QoS for voice over IP (VoIP) configured and you upgrade the switch software to Cisco IOS Release 12.2(40)SE (or later), when you enter the auto qos voip cisco-phone interface configuration command on another interface, you might see this message:

AutoQoS Error: ciscophone input service policy was not properly appliedpolicy map
AutoQoS-Police-CiscoPhone not configured.

If this happens, enter the no auto qos voip cisco-phone interface command on all interface with this configuration to delete it. Then enter the auto qos voip cisco-phone command on each of these interfaces to reapply the configuration.

Device Manager Notes

- You cannot create and manage switch clusters through the device manager. To create and manage switch clusters, use the CLI or Cisco Network Assistant.

- When the switch is running a localized version of the device manager, the switch displays settings and status only in English letters. Input entries on the switch can only be in English letters.

- For device manager session on Internet Explorer, popup messages in Japanese or in simplified Chinese can appear as garbled text. These messages appear properly if your operating system is in Japanese or Chinese.

- The legend on the device manager incorrectly includes the 1000BASE-BX SFP module.

- We recommend this browser setting to speed up the time needed to display the device manager from Microsoft Internet Explorer.

From Microsoft Internet Explorer:

1. 1. Choose Tools > Internet Options.

2. 2. Click Settings in the “Temporary Internet files” area.

3. 3. From the Settings window, choose Automatically.

4. 4. Click OK.

5. 5. Click OK to exit the Internet Options window.

- The HTTP server interface must be enabled to display the device manager. By default, the HTTP server is enabled on the switch. Use the show running-config privileged EXEC command to see if the HTTP server is enabled or disabled.

If you are not using the default method of authentication (the enable password), you need to configure the HTTP server interface with the method of authentication used on the switch

Beginning in privileged EXEC mode, follow these steps to configure the HTTP server interface:

Command

Purpose

Step 1

configure terminal

Enters global configuration mode.

Step 2

ip http authentication {aaa | enable | local}

Configure the HTTP server interface for the type of authentication that you want to use.

- aaa : Enable the authentication, authorization, and accounting feature. You must enter the aaa new-model interface configuration command for the aaa keyword to appear.

- enable : Enable password, which is the default method of HTTP server user authentication, is used.

- local : Local user database, as defined on the Cisco router or access server, is used.

Step 3

end

Returns to privileged EXEC mode.

Step 4

show running-config

Verify your entries.

The device manager uses the HTTP protocol (the default is port 80) and the default method of authentication (the enable password) to communicate with the switch through any of its Ethernet ports and to allow switch management from a standard web browser.

If you change the HTTP port, you must include the new port number when you enter the IP address in the browser Location or Address field (for example, http://10.1.126.45:184 where 184 is the new HTTP port number). You should write down the port number through which you are connected. Use care when changing the switch IP information.

- If you use Internet Explorer Version 5.5 and select a URL with a nonstandard port at the end of the address (for example, www.cisco.com:84), you must enter http:// as the URL prefix. Otherwise, you cannot launch the device manager.

Caveats

- Cisco Bug Search Tool

- Open Caveats

- Resolved Caveats

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/.

2. Enter the bug ID in the Search For: field.

Open Caveats

None

Resolved Caveats

Resolved in Cisco IOS Release 15.2(7)E1

- None

Resolved in Cisco IOS Release 15.2(7)E2

- None

Resolved in Cisco IOS Release 15.2(7)E3

Caveat ID Number

Description

CSCvu10399

Cisco IOS and IOS XE Software Information Disclosure Vulnerability.

CSCvv00134

VTY telnet disable, enable SSH-based on platform request.

Resolved in Cisco IOS Release 15.2(7)E4

Caveat ID Number

Description

CSCvv93417

Stack Member Switch fails wired dot1x; MasterSwitch passes dot1x using the same configs

CSCvv86851

TACACS not working if TACACS group server has the server-private ip key passw command in the Cisco IOS Release 15.2(7)E3 and Cisco IOS XE Release 3.11.3E.

Resolved in Cisco IOS Release 15.2(7)E5

Caveat ID Number

Description

CSCvx76066

Switch crashes due to "HTTP Core".

CSCvy62709

PACL IPv6 support needed in 2960C Platform.

CSCvx66699

Cisco IOS and IOS XE Software TrustSec CLI Parser Denial of Service Vulnerability.

Resolved in Cisco IOS Release 15.2(7)E6

- None

Resolved in Cisco IOS Release 15.2(7)E7

Caveat ID Number

Description

CSCvw60355

DHCPv6: Memory allocation of DHCPv6 relay option results in crash.

CSCvx63027

Cisco IOS and IOS XE Software SSH Denial of Service Vulnerability.

CSCwa96810

Cisco IOS and IOS XE Software Common Industrial Protocol Request Denial of Service Vulnerability.

Resolved in Cisco IOS Release 15.2(7)E8

- None

Resolved in Cisco IOS Release 15.2(7)E9

- None

Resolved in Cisco IOS Release 15.2(7)E10

Caveat ID Number

Description

CSCwh96519

For PoE used and remaining power on 3560, the SNMP walk result is showing inaccurate data

CSCwf54007

Cisco IOS and IOS XE Software IS-IS Denial of Service Vulnerability

Related Documentation

User documentation in HTML format includes the latest documentation updates and might be more current than the complete book PDF available on Cisco.com.

These documents provide more information about the 2960-C and 2960-Plus switches and are available at Cisco.com:

http://www.cisco.com/en/US/products/hw/switches/ps5023/tsd_products_support_series_home.html

http://www.cisco.com/en/US/products/hw/switches/ps5528/tsd_products_support_series_home.html

https://www.cisco.com/en/US/products/ps10081/tsd_products_support_series_home.html

http://www.cisco.com/en/US/products/ps6406/tsd_products_support_series_home.html

These documents provide complete information about the Catalyst 2960 and 2960-S switches and are available on Cisco.com:

- Catalyst 2960 and 2960-S Switch Software Configuration Guide

- Catalyst 2960 and 2960-S Switch Command Reference

- Catalyst 3750, 3560, 3550, 2975, 2970, 2960, and 2960-S Switch System Message Guide

- Catalyst 2960-S Switch Hardware Installation Guide

- Catalyst 2960-S Switch Getting Started Guide

- Catalyst 2960 Switch Hardware Installation Guide

- Catalyst 2960 Switch Getting Started Guide

- Catalyst 2960 Switch Getting Started Guide —available in English, simplified Chinese, French, German, Italian, Japanese, and Spanish

- Regulatory Compliance and Safety Information for the Catalyst 2960 and 2960-S Switch

For other information about related products, see these documents:

- Smart Install Configuration Guide

- Auto Smartports Configuration Guide

- Cisco EnergyWise Configuration Guide

- Getting Started with Cisco Network Assistant

- Release Notes for Cisco Network Assistant

- Cisco RPS 300 Redundant Power System Hardware Installation Guide

- Cisco RPS 675 Redundant Power System Hardware Installation Guide

- For more information about the Network Admission Control (NAC) features, see the Network Admission Control Software Configuration Guide

- Information about Cisco SFP, SFP+, and GBIC modules is available from this Cisco.com site:

http://www.cisco.com/en/US/products/hw/modules/ps5455/prod_installation_guides_list.html

SFP compatibility matrix documents are available from this Cisco.com site:

http://www.cisco.com/en/US/products/hw/modules/ps5455/products_device_support_tables_list.html

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: 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.

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