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Cisco Catalyst 2950 Series Switches

Release Notes for the Catalyst 2950 Switch Cisco IOS Release 12.1(9)EA1 (Revised June 17, 2002)

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Release Notes for the Catalyst 2950 Switch Cisco IOS Release 12.1(9)EA1

Table Of Contents

Release Notes for the Catalyst 2950 Switch Cisco IOS Release 12.1(9)EA1

Contents

System Requirements

Hardware Supported

Hardware Not Supported

Software Compatibility

Recommended Platform Configuration for Web-Based Management

Operating System and Browser Support

Installing the Required Plug-In

Creating Clusters with Different Releases of IOS Software

Downloading Software

Guidelines for Downloading Switch Software

Determining the Software Version and Feature Set

Which Files to Use

Upgrading a Switch by Using CMS

Upgrading a Switch by Using the CLI

Downloading the Software and TFTP Server Application

Copying the Current Startup Configuration from the Switch to a PC or Server

Using the CLI to Upgrade a Catalyst 2950 Switch

Upgrading Catalyst 2950, Catalyst 2900 XL, or Catalyst 3500 XL Member Switches

Upgrading Catalyst 1900 or Catalyst 2820 Member Switches

Recovering from Software Failure

Installation Notes

Setting Up the Catalyst 2950 Initial Configuration

Configuring Browsers and Accessing CMS

Configuring Netscape Communicator (All Versions)

Configuring Microsoft Internet Explorer (4.01)

Configuring Microsoft Internet Explorer (5.0)

Displaying the CMS Access Page

New Features

New Hardware Features

New Software Features

Limitations and Restrictions

Hardware and Software Compatibility Matrixes

Port Configuration Conflicts

SPAN Limitations

Important Notes

Read-Only Mode in CMS

Connecting Catalyst 2950G-24-EI-DC Switches to Compatible Devices

Changing the Management VLAN

IGMP Filtering

Caveats

Open Caveats

Resolved Caveats

Documentation Updates

Modifications

Errors

Related Documentation

Obtaining Documentation

World Wide Web

Documentation CD-ROM

Ordering Documentation

Documentation Feedback

Obtaining Technical Assistance

Cisco.com

Technical Assistance Center

Cisco TAC Web Site

Cisco TAC Escalation Center


Release Notes for the Catalyst 2950 Switch Cisco IOS Release 12.1(9)EA1


April 26, 2002 (Revised June 17, 2002)

The Cisco IOS Release 12.1(9)EA1 runs on Catalyst 2950 switches.

These release notes include important information about this IOS release and any limitations, restrictions, and caveats that apply to it. To verify that these are the correct release notes for your switch:

If you are installing a new switch, refer to the IOS release label on the rear panel of your switch.

If your switch is running, you can use the show version user EXEC command. See the "Determining the Software Version and Feature Set" section.

If you are upgrading to a new release, refer to the software upgrade filename for the IOS version.

This IOS release is part of a special release of Cisco IOS software that is not released on the same 8-week maintenance cycle that is used for other platforms. As maintenance releases and future IOS releases become available, they will be posted to Cisco.com in the Cisco IOS software area.

Contents

This information is in the release notes:

"System Requirements" section

"Downloading Software" section

"Installation Notes" section

"New Features" section

"Limitations and Restrictions" section

"Important Notes" section

"Caveats" section

"Documentation Updates" section

"Related Documentation" section

"Obtaining Documentation" section

"Obtaining Technical Assistance" section

System Requirements

These are the system requirements for this IOS release:

"Hardware Supported" section

"Hardware Not Supported" section

"Software Compatibility" section

Hardware Supported

The Catalyst 2950 switch is supported by either the standard software image (SI) or the enhanced software image (EI). The enhanced software image provides a richer set of features, including access control lists (ACLs), enhanced quality of service (QoS) features, extended-range VLANs, the IEEE 802.1W Rapid Spanning Tree Protocol (RSTP), and the IEEE 802.1S Multiple STP (MSTP).

For information about the software releases that support the switches listed in Table 1, see the "Limitations and Restrictions" section.

Table 1 lists the hardware supported by this release:

Table 1 Hardware Supported 

Hardware
Software Image
Description

Catalyst 2950-12

Standard image

12 fixed autosensing 10/100 Ethernet ports

Catalyst 2950-24

Standard image

24 fixed autosensing 10/100 Ethernet ports

Catalyst 2950C-24

Enhanced image

24 fixed autosensing 10/100 Ethernet ports and 2 100BASE-FX ports

Catalyst 2950G-12-EI

Enhanced image

12 fixed autosensing 10/100 Ethernet ports and 2 GBIC1 module slots

Catalyst 2950G-24-EI 

Enhanced image

24 fixed autosensing 10/100 Ethernet ports and 2 GBIC module slots

Catalyst 2950G-24-EI-DC

Enhanced image

24 fixed autosensing 10/100 Ethernet ports and 2 GBIC module slots with DC-input power

Catalyst 2950G-48-EI

Enhanced image

48 fixed autosensing 10/100 Ethernet ports and 2 GBIC module slots

Catalyst 2950T-24

Enhanced image

24 fixed autosensing 10/100 Ethernet ports and 2 10/100/1000 Ethernet ports2

GBIC Modules

1000BASE-SX GBIC

1000BASE-LX/LH GBIC

1000BASE-ZX GBIC

1000BASE-T GBIC (model WS-5483)

Coarse Wave Division Multiplexer (CWDM) fiber-optic GBIC3

GigaStack GBIC

Redundant power system

Cisco RPS 300 Redundant Power System

1 GBIC = Gigabit Interface Converter

2 The 10/100/1000 ports operate only in full-duplex mode.

3 This feature is only supported when your switch is running the enhanced software image.


Hardware Not Supported

Table 2 lists the hardware that is not supported by this release:

Table 2 Hardware Not Supported

Hardware
Description

GBIC module

1000BASE-T GBIC (model WS-G4582)

Redundant power system

Cisco RPS 600 Redundant Power System


Software Compatibility

These are the software compatibility requirements for this IOS release:

"Recommended Platform Configuration for Web-Based Management" section

"Operating System and Browser Support" section

"Installing the Required Plug-In" section

"Creating Clusters with Different Releases of IOS Software" section

Recommended Platform Configuration for Web-Based Management

Table 3 lists the recommended platforms for Web-based management.

Table 3 Recommended Platform Configuration for Web-Based Management

OS
Processor Speed
DRAM
Number of Colors
Resolution
Font Size

Windows NT 4.01

Pentium 300 MHz

128 MB

65,536

1024 x 768

Small

Solaris 2.5.1

SPARC 333 MHz

128 MB

Most colors for applications

Small (3)

1 Service Pack 3 or higher is required.


The minimum PC requirement is a Pentium processor running at 233 MHz with 64 MB of DRAM. The minimum UNIX workstation requirement is a Sun Ultra 1 running at 143 MHz with 64 MB of DRAM.

For information about supported operating systems, see the next section.

Operating System and Browser Support

You can access the web-based interfaces by using the operating systems and browsers listed in Table 4. The switch checks the browser version when starting a session to ensure that the browser is supported. If the browser is not supported, the switch displays an error message, and the session does not start.

Table 4 Supported Operating Systems and Browsers

Operating System
Minimum Service Pack or Patch
Netscape Communicator 1
Microsoft Internet Explorer 2

Windows 95

Service Pack 1

4.61, 4.7x

4.01a, 5.0, 5.5

Windows 98

Second Edition

4.61, 4.7x

4.01a, 5.0, 5.5

Windows NT 4.0

Service Pack 3 or later

4.61, 4.7x

4.01a, 5.0, 5.5

Windows 2000

None

4.61, 4.7x

4.01a, 5.0, 5.5

Solaris 2.5.1 or later

Sun-recommended patch cluster for the OS and Motif library patch 103461-24

4.61, 4.7x

Not supported

1 Netscape Communicator versions 4.60 and 6.0 are not supported.

2 Service Pack 1 or higher is required for Internet Explorer 5.5.



Note If your browser is Internet Explorer and you receive an error message stating that the page might not display correctly because your security settings prohibit running activeX controls, this might mean that your security settings are set too high. To lower security settings, go to Tools > Internet Options, and select the Security tab. Select the indicated Zone, and move the Security Level for this Zone slider from High to Medium (the default).



Note In Cluster Management displays, Internet Explorer versions 4.01 and 5.0 might not display edge devices that are not connected to the command switch. Other functionality is similar to that of Netscape Communicator.


Installing the Required Plug-In

A Java plug-in is required for the browser to access and run the Java-based Cluster Management Suite (CMS). Download and install the plug-in before you start CMS. Each platform, Windows and Solaris, supports three plug-in versions. For information on the supported plug-ins, see the "Windows 2000, Windows 95, Windows 98, and Windows NT 4.0 Platforms" section and the "Solaris Platforms" section.

You can download the recommended plug-ins from this URL: http://www.cisco.com/pcgi-bin/tablebuild.pl/java


Note Uninstall older versions of the Java plug-ins before installing the Java plug-in.


If the Java applet does not initialize after you have installed the plug-in, open the Java Plug-in Control Panel (Start > Programs > Java Plug-in Control Panel), and verify these settings:

In the Proxies tab, verify that the Use browser settings is checked and that no proxies are enabled.


Note If you are running McAfee VirusScan on Windows 2000 and the plug-in takes a long time to load, you can speed up CMS operation by disabling the VirusScan Internet Filter option, the Download Scan option, or both.

From the Start menu, disable the options by selecting Start > Programs > Network Associates > Virus Scan Console > Configure.

or

From the taskbar, right-click the Virus Shield icon, and in the Quick Enable menu, disable the options by deselecting Internet Filter or Download Scan.


Windows 2000, Windows 95, Windows 98, and Windows NT 4.0 Platforms

These Java plug-ins are supported on the Windows platform:

Java plug-in 1.3.1

Java plug-in 1.3.0

Java plug-in 1.2.2_05

You can download these plug-ins from this URL:

http://www.cisco.com/pcgi-bin/tablebuild.pl/java


Note If you start CMS without having installed the required Java plug-in, the browser automatically detects this. If you are using a supported Internet Explorer browser, it automatically downloads and installs the Java plug-in 1.3.0 (default). If you are using a supported Netscape browser, the browser displays a Cisco.com page that contains the Java plug-in and installation instructions. If you are using Windows 2000, Netscape Communicator might not detect the missing Java plug-in.


Solaris Platforms

These Java plug-ins are supported on the Solaris platform:


Caution To avoid performance and compatibility issues, do not use Java plug-ins later than Java plug-in 1.3.1

Java plug-in 1.2.2_07

Java plug-in 1.3.0

Java plug-in 1.3.1

You can download these plug-ins and instructions from this URL:

http://www.cisco.com/pcgi-bin/tablebuild.pl/java

To install the Java plug-in, follow the instructions in the README_FIRST.txt file.

Creating Clusters with Different Releases of IOS Software

When a cluster consists of Catalyst 3550 switches and a mixture of other Catalyst switches, we strongly recommend using only the Catalyst 3550 switches as the command and standby command switches. When the command switch is a Catalyst 3550 switch, all standby command switches must also be Catalyst 3550 switches. The Catalyst 3550 switch that has the latest software should be the command switch.

If your cluster has Catalyst 2950, Catalyst 2900 XL, and Catalyst 3500 XL switches, the Catalyst 2950 switch should be the command switch. The Catalyst 2950 switch that has the latest software should be the command switch.

If your switch cluster has Catalyst 1900, Catalyst 2820, Catalyst 2900 XL, and Catalyst 3500 XL switches, either the Catalyst 2900 XL or Catalyst 3500 XL should be the command switch. The Catalyst 2900 or 3500 XL switch that has the latest software should be the command switch.

Table 5 lists the cluster capabilities and software versions for the switches.

Table 5 Switch Software and Cluster Capability

Switch
IOS Release
Cluster Capability

Catalyst 3550

Release 12.1(4)EA1 or later

Member or command switch

Catalyst 3500 XL

Release 12.0(5.1)XU or later

Member or command switch

Catalyst 2950

Release 12.0(5.2)WC(1) or later

Member or command switch

Catalyst 2900 XL (8-MB switches)

Release 12.0(5.1)XU or later

Member or command switch

Catalyst 2900 XL (4-MB switches)

Release 11.2(8.5)SA6 (recommended)

Member switch only

Catalyst 1900 and 2820

Release 9.00(-A or -EN)

Member switch only


Some versions of the Catalyst 2900 XL software do not support clustering, and if you have a cluster with switches that are running different versions of IOS software, software features added on the latest release might not be reflected on switches running the older versions. For example, if you start Visual Switch Manager (VSM) on a Catalyst 2900 XL switch running Release 11.2(8)SA6, the windows and functionality can be different from a switch running Release 12.0(5)WC(1) or later.


Note The CMS is not forward-compatible, which means that if a member switch is running a software version that is newer than the release running on the command switch, the new features are not available on the member switch. If the member switch is a new device supported by a software release that is later than the software release on the command switch, the command switch cannot recognize the member switch and it is displayed as an unknown device in the Front Panel view. You cannot configure any parameters or generate a report through CMS for that member; instead, you must launch the Device Manager application to perform configuration and obtain reports for that member.


Downloading Software

This section describes these procedures for downloading software:

"Guidelines for Downloading Switch Software" section

"Determining the Software Version and Feature Set" section

"Which Files to Use" section

"Upgrading a Switch by Using CMS" section

"Upgrading a Switch by Using the CLI" section

"Recovering from Software Failure" section

For information about the software releases that support the Catalyst 2950 switches, see the "Limitations and Restrictions" section.


Note Before downloading software, read this section for important information.



Note The Catalyst 2950-12 and Catalyst 2950-24 switches cannot be upgraded to Cisco IOS Release 12.1(6)EA2, Release 12.1(6)EA2a, or Release 12.1(6)EA2b. They can be upgraded to Release 12.1(6)EA2c or later.


Guidelines for Downloading Switch Software

When using CMS to upgrade multiple switches from the Cisco TFTP server, the Cisco TFTP server application can process multiple requests and sessions. When using CMS to upgrade multiple switches from the Cisco TFTP server, you must first disable the TFTP Show File Transfer Progress and the Enable Logging options to avoid TFTP server failures. If you are performing multiple-switch upgrades with a different TFTP server, it must be capable of managing multiple requests and sessions at the same time.

When you upgrade a switch, the switch continues to operate while the new software is copied to Flash memory. If Flash memory has enough space, the new image is copied to the selected switch but does not replace the running image until you reboot the switch. If a failure occurs during the copy process, you can still reboot your switch by using the old image. If Flash memory does not have enough space for two images, the new image is copied over the existing one. Features provided by the new software are not available until you reload the switch.

If a failure occurs while copying a new image to the switch, and the old image has already been deleted, refer to the "Recovering from Corrupted Software" section in the "Troubleshooting" chapter of the Catalyst 2950 Desktop Switch Software Configuration Guide.

Determining the Software Version and Feature Set

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

You can use the show version user EXEC command to see the software version that is running on your switch. In the display, check the line that begins with System image file is. This line shows the directory name in Flash memory where the image is stored. A couple of lines below the image name, you see Running Enhanced Image if you are running the enhanced software image or Running Standard Image if you are running the standard software image.


Note Although the show version output always shows the software image running on the switch (enhanced or standard), the model name shown at the end of this display is the factory configuration and does not change if you upgrade the software image.


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.

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 both the IOS image file and the HTML files (needed for the CMS). You must use the combined .tar file to upgrade the switch through the CMS.

The .tar file is an archive file from which you can extract files by using the archive tar command.


Note If you are upgrading from a release earlier than Release 12.1(6)EA2, use the tar command instead of the archive tar command.


Table 6 lists the software filenames for this IOS release.

Table 6 Catalyst 2950 Cisco IOS Software Files

Filename
Description

c2950-i6q4l2-mz.121-9.EA1.bin

Catalyst 2950 enhanced and standard IOS image.

c2950-i6q4l2-mz.121-9.EA1.tar

Catalyst 2950 enhanced and standard IOS image and CMS files.


Upgrading a Switch by Using CMS

You can upgrade switch software by using CMS. From the menu bar, select Administration > Software Upgrade. For detailed instructions, click Help.

If you are using Cluster Manager to upgrade a switch cluster, you can use the Software Upgrade feature to upgrade all or some of the switches in a cluster at once. Consider these conditions when doing an upgrade:

You cannot upgrade Catalyst 2950, Catalyst 2900 XL, and Catalyst 3500 XL switches at the same time. However, you can group together and upgrade Catalyst 1900 and Catalyst 2820 switches at the same time.

Upgrade Catalyst 1900 and Catalyst 2820 switches last. To function efficiently, these switches need to be rebooted shortly after the upgrade occurs. If you do not click Reboot Cluster in 30 seconds after the upgrade, the Catalyst 1900 and Catalyst 2820 switches automatically reboot.

For Catalyst 2950, Catalyst 2900 XL, and Catalyst 3500 XL switches, enter the image_name.tar filename in the New File Name field. The .tar file contains both the IOS image and the web-management code.

For Catalyst 1900 and Catalyst 2820 switches, enter the image_name.bin filename in the New File Name field. The .bin file contains the software image and the web-management code.

Follow these steps to use Cluster Manager to upgrade software. Refer to the online help for more details.


Step 1 In Cluster Manager, select Administration > Software Upgrade to display the Software Upgrade window.

Step 2 Enter the .tar filename (for Catalyst 2950, Catalyst 2900 XL, and Catalyst 3500 XL switches) or the .bin filename (for Catalyst 1900 and Catalyst 2820 switches) that contains the switch software image and the web-management code.

You can enter just the filename or a pathname into the New Image File Name field. You do not need to enter a pathname if the image file is in the directory that you have defined as the TFTP root directory.



Note You can also use Device Manager to upgrade a single switch by following the same software upgrade procedure.



Note Close your browser after the upgrade process is complete.


Upgrading a Switch by Using the CLI

To download switch software by using the CLI, follow these procedures in this order:

Decide which software files to download from Cisco.com (see the "Determining the Software Version and Feature Set" section).

Download the .tar file from Cisco.com (see the "Downloading the Software and TFTP Server Application" section).

Use the archive tar command to extract the IOS image and the HTML files from the .tar file during the TFTP copy to the switch. If you are upgrading from a release earlier than Release 12.1(6)EA2, use the tar command instead of the archive tar command.

Copy the current startup configuration file (see the "Copying the Current Startup Configuration from the Switch to a PC or Server" section).

If the upgrade to the new software fails or if the new startup configuration fails, you can reinstall the previous version of the switch software and use the copy of the startup configuration file to start the switch. If a failure occurs while copying a new image to the switch, and the old image has already been deleted, see the "Guidelines for Downloading Switch Software" section.

If you are using the CLI to upgrade a Catalyst 2950 switch, see the "Using the CLI to Upgrade a Catalyst 2950 Switch" section.

If you are using the CLI to upgrade a member switch in a switch cluster, follow one of these procedures:

If you are upgrading Catalyst 2950, Catalyst 2900 XL, and Catalyst 3500 XL member switches, see the "Upgrading Catalyst 2950, Catalyst 2900 XL, or Catalyst 3500 XL Member Switches" section.

If you are upgrading Catalyst 1900 or Catalyst 2820 member switches, see the "Upgrading Catalyst 1900 or Catalyst 2820 Member Switches" section.

If you are upgrading a member switch in a switch cluster, because a member switch might not be assigned an IP address, command-line software upgrades through TFTP are managed through the command switch.


Note If you are upgrading from an IOS release earlier than Release 12.1(6)EA2, use the tar command instead of the archive tar command as described in the "Using the CLI to Upgrade a Catalyst 2950 Switch" section, the "Upgrading Catalyst 2950, Catalyst 2900 XL, or Catalyst 3500 XL Member Switches" section, and the "Upgrading Catalyst 1900 or Catalyst 2820 Member Switches" section.


Downloading the Software and TFTP Server Application

This procedure is for copying the combined .tar file to the Catalyst 2950 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.

Follow these steps to download the software and, if necessary, the TFTP server application, from Cisco.com to your management station:


Step 1 Use Table 6 to identify the files that you want to download.

Step 2 Download the files from one of these locations:

If you have a SmartNet support contract, go to this URL, and log in to download the appropriate files:

http://www.cisco.com/kobayashi/sw-center/sw-lan.shtml

If you do not have a SmartNet contract, go to this URL, follow the instructions to register on Cisco.com, and download the appropriate files:

http://www.cisco.com/public/sw-center/sw-lan.shtml

To download the enhanced and standard software files, select Download Cisco Catalyst 2950 software.

Step 3 Use the CLI or web-based interface to perform a TFTP transfer of the file or files to the switch after you have downloaded them to your PC or workstation.

The readme.txt file describes how to download the TFTP server application. New features provided by the software are not available until you reload the software.


Copying the Current Startup Configuration from the Switch to a PC or Server

When you make changes to a switch configuration, your changes become part of the running configuration. When you enter the command to save those changes to the startup configuration, the switch copies the configuration to the config.text file in Flash memory. To ensure that you can recreate the configuration if a switch fails, you might want to copy the config.text file from the switch to a PC or server.

This procedure requires a configured TFTP server such as the Cisco TFTP server available on Cisco.com.

Beginning in privileged EXEC mode, follow these steps to copy a switch configuration file to the PC or server that has the TFTP server application:


Step 1 Copy the file in Flash memory to the root directory of the TFTP server:

switch# copy flash:config.text tftp

Step 2 Enter the IP address of the device where the TFTP server resides:

Address or name of remote host []? ip_address

Step 3 Enter the name of the destination file (for example, config.text):

Destination filename [config.text]? yes/no

Step 4 Verify the copy by displaying the contents of the root directory on the PC or server.


Using the CLI to Upgrade a Catalyst 2950 Switch

This procedure is for upgrading Catalyst 2950 switches by copying the .tar file to the switch. You copy the files to the switch from a TFTP server and extract the files by entering the archive tar command, with these results:

Changes the name of the current image file to the name of the new file that you are copying and replaces the old image file with the new one. Perform this step only if you have space available on your switch.

Disables access to the HTML pages and deletes the existing HTML files before the software upgrade to avoid a conflict if users access the web pages during the software upgrade.

Reenables access to the HTML pages after the upgrade is complete.

Follow these steps to upgrade the switch software by using a TFTP transfer:


Step 1 If your PC or workstation cannot act as a TFTP server, copy the file to a TFTP server to which you have access.

Step 2 Access the CLI by starting a Telnet session or by connecting to the switch console port through the RS-232 connector.

To start a Telnet session on your PC or workstation, enter this command:

server% telnet switch_ip_address

Enter the Telnet password if you are prompted to do so.

Step 3 Enter privileged EXEC mode:

switch> enable 
switch#

Enter the password if you are prompted to do so.

Step 4 Display the name of the running (default) image file (BOOT path-list). This example shows the name in italic:

switch# show boot 
BOOT path-list:    flash:current_image 
Config file:       flash:config.text 
Enable Break:      1 
Manual Boot:       no 
HELPER path-list:  
NVRAM/Config file 
buffer size: 32768

Step 5 If there is no software image defined in the BOOT path-list, enter dir flash: to display the contents of Flash memory.

Step 6 Using the exact, case-sensitive name of the .tar file that you downloaded, rename the running image file to that name, and replace the .tar extension with .bin. The image filename is then the same as the downloaded filename but with a .bin extension. This step does not affect the operation of the switch.


Note Perform this step only if you have space available on your switch and want to retain a copy of the old image.


switch# rename flash:current_image flash:new_image 
Source filename [current_image]?  
Destination filename [new_image]? 

For example:

switch# rename flash:c2950-i6q4l2-mz.121-6.EA2c.bin flash:c2950-i6q4l2-mz.121-9.EA1.bin 

Step 7 Display the contents of Flash memory to verify the renaming of the file:

switch# dir flash: 

Directory of flash:/
  3  drwx       10176   Mar 01 2001 00:04:34  html
  6  -rwx        2343   Mar 01 2001 03:18:16  config.text
171  -rwx     1667997   Mar 01 2001 00:02:39 c2950-i6q4l2-mz.121-9.EA1.bin
  7  -rwx        3060   Mar 01 2001 00:14:20  vlan.dat
172  -rwx         100   Mar 01 2001 00:02:54  env_vars

7741440 bytes total (4788224 bytes free)

Step 8 Enter global configuration mode:

switch# configure terminal 
Enter configuration commands, one per line. End with CNTL/Z. 

Step 9 Enter the boot command with the name of the new image filename:

switch(config)# boot system flash:new_image

For example:

switch(config)# boot system flash:c2950-i6q4l2-mz.121-9.EA1.bin

Note If the show boot command entered in Step 4 displays no image name, you do not need to enter this command; the switch automatically finds the correct file to use when it resets.


Step 10 Return to privileged EXEC mode:

switch(config)# end

Step 11 Remove the HTML files:

switch# delete flash:html/* 

Press Enter to confirm the deletion of each file. Do not press any other keys during this process.

Step 12 Enter this command to copy the new image and HTML files to Flash memory:


Caution In this step, the archive tar command copies the .tar file that contains both the image and the HTML files. If you are upgrading from a release earlier than Release 12.1(6)EA2, use the tar command instead of the archive tar command.

switch# archive tar /x tftp://server_ip_address/path/filename.tar flash: 
Loading /path/filename.tar from server_ip_address (via VLAN1):!) 
extracting info (110 bytes)
extracting c2950-i6q4l2-mz.121-9.EA1.bin (2239579 bytes)!!!!!!!!!!!!!!!!!!!!
html/ (directory)
extracting html/Detective.html.gz (1139 bytes)!
extracting html/ieGraph.html.gz (553 bytes)
extracting html/DrawGraph.html.gz (787 bytes)
extracting html/GraphFrame.html.gz (802 bytes)!
... 

Depending on the TFTP server being used, you might need to enter only one slash (/) after the server_ip_address in the archive tar command.

Step 13 Enter global configuration mode:

switch# configure terminal 
Enter configuration commands, one per line. End with CNTL/Z.

Step 14 Return to privileged EXEC mode:

switch(config)# end

Step 15 Reload the new software with this command:

switch# reload 
System configuration has been modified. Save? [yes/no]:y 
Proceed with reload? [confirm] 

Step 16 Press Return to confirm the reload.

Your Telnet session ends when the switch resets.

After the switch reboots, use Telnet to return to the switch, and enter the show version user EXEC command to verify the upgrade procedure. If you have a previously opened browser session to the upgraded switch, close the browser, and start it again to ensure that you are using the latest HTML files.


Upgrading Catalyst 2950, Catalyst 2900 XL, or Catalyst 3500 XL Member Switches

Follow these steps to upgrade the software on a member switch:


Step 1 In privileged EXEC mode on the command switch, display information about the cluster members:

switch# show cluster members

From the output, select the number of the member switch that you want to upgrade. The member number is in the SN column of the display. You need this member number for Step 2.

Step 2 Log in to the member switch (for example, member number 1):

switch# rcommand 1

Step 3 Enter privileged EXEC mode:

switch> enable 
switch#

Enter the password if you are prompted to do so.

Step 4 Display the name of the running (default) image file (BOOT path-list). This example shows the name in italic:

switch# show boot 
BOOT path-list:    flash:current_image 
Config file:       flash:config.text 
Enable Break:      1 
Manual Boot:       no 
HELPER path-list:  
NVRAM/Config file 
buffer size: 32768

Step 5 If there is no software image defined in the BOOT path-list, enter dir flash: to display the contents of Flash memory.

Step 6 Using the exact, case-sensitive name of the .tar file that you downloaded, rename the running image file to that name, and replace the .tar extension with .bin. The image filename is then the same as the downloaded filename but with a .bin extension. This step does not affect the operation of the switch.


Note Perform this step only if you have space available on your switch and want to retain a copy of the old image.


switch# rename flash:current_image flash:new_image 
Source filename [current_image]?  
Destination filename [new_image]? 

For example:

switch# rename flash:c2950-i6q4l2-mz.121-6.EA2c.bin flash:c2950-i6q4l2-mz.121-9.EA1.bin 

Step 7 Display the contents of Flash memory to verify the renaming of the file:

switch# dir flash: 

Directory of flash:/
  3  drwx       10176   Mar 01 2001 00:04:34  html
  6  -rwx        2343   Mar 01 2001 03:18:16  config.text
171  -rwx     1667997   Mar 01 2001 00:02:39 c2950-i6q4l2-mz.121-9.EA1.bin
  7  -rwx        3060   Mar 01 2001 00:14:20  vlan.dat
172  -rwx         100   Mar 01 2001 00:02:54  env_vars

7741440 bytes total (4788224 bytes free)

Step 8 Enter global configuration mode:

switch# configure terminal 
Enter configuration commands, one per line. End with CNTL/Z. 

Step 9 Enter the boot command with the name of the new image filename:

switch(config)# boot system flash:new_image

For example:

switch(config)# boot system flash:c2950-i6q4l2-mz.121-9.EA1.bin

Note If the show boot command entered in Step 4 displays no image name, you do not need to enter this command; the switch automatically finds the correct file to use when it resets.


Step 10 Return to privileged EXEC mode:

switch(config)# end

Step 11 Remove the HTML files:

switch# delete flash:html/* 

Press Enter to confirm the deletion of each file. Do not press any other keys during this process.

Step 12 Start the TFTP copy function as if you were initiating it from the command switch.


Caution In this step, the archive tar command copies the .tar file that contains both the image and the HTML files. If you are upgrading from a release earlier than Release 12.1(6)EA2, use the tar command instead of the archive tar command.

switch-1# archive tar /x tftp://server_ip_address/path/filename.tar flash:
Source IP address or hostname [server_ip_address]?  
Source filename [path/filename]?  
Destination filename [flash:new_image]?  
Loading /path/filename.bin from server_ip_address (via!) 
[OK - 843975 bytes]

Step 13 Enter global configuration mode:

switch# configure terminal 
Enter configuration commands, one per line. End with CNTL/Z.

Step 14 Return to privileged EXEC mode:

switch(config)# end

Step 15 Reload the new software with this command:

switch-1# reload 
System configuration has been modified. Save? [yes/no]:y 
Proceed with reload? [confirm]

Press Enter to start the download.


You lose contact with the switch while it reloads the software. For more information on the rcommand command, refer to the Catalyst 2950 Desktop Switch Command Reference.

Upgrading Catalyst 1900 or Catalyst 2820 Member Switches

Follow these steps to upgrade the software on a Catalyst 1900 or Catalyst 2820 member switch:


Step 1 In privileged EXEC mode on the command switch, display information about the cluster members:

switch# show cluster members

From the display, select the number of the member switch that you want to upgrade. The member number is in the SN column of the display. You need this member number for Step 2.

Step 2 Log in to the member switch (for example, member number 1):

switch# rcommand 1

Step 3 For switches running standard edition software, enter the password (if prompted), access the Firmware Configuration menu from the menu console, and perform the upgrade. Follow the instructions in the installation and configuration guide that shipped with your switch. When the download is complete, the switch resets and begins using the new software.

The Telnet session accesses the menu console (the menu-driven interface) if the command switch password is privilege level 15. If the command switch password is privilege level 1, you are prompted for the password.

You lose contact with the switch while it reloads the software.

Step 4 For switches running Enterprise Edition Software, start the TFTP copy as if you were initiating it from the member switch:

switch-1# copy tftp://host/src_file opcode

For example, copy tftp://spaniel/op.bin opcode downloads new system operational code op.bin from the host spaniel.


You should see the TFTP successfully downloaded operational code message. When the download is complete, the switch resets and begins using the new software. If this message does not appear, refer to the installation and configuration guide that shipped with your switch for more information.

You can also upgrade the switch software through the Firmware Configuration menu from the menu console. For more information, refer to the installation and configuration guide that shipped with your switch.

You lose contact with the switch while it reloads the software.

Recovering from Software Failure

If the software fails, you can reload the software. For detailed recovery procedures, refer to the "Troubleshooting" chapter in the Catalyst 2950 Desktop Switch Software Configuration Guide.

Installation Notes

You can assign IP information to your switch by using the setup program, the Dynamic Host Configuration Protocol (DHCP)-based autoconfiguration (refer to the Catalyst 2950 Desktop Switch Software Configuration Guide), or by manually assigning an IP address (refer to the Catalyst 2950 Desktop Switch Software Configuration Guide).

This section describes these installation procedures:

"Setting Up the Catalyst 2950 Initial Configuration" section

"Configuring Browsers and Accessing CMS" section

Setting Up the Catalyst 2950 Initial Configuration

The first time that you access the switch, it runs a setup program that prompts you for an IP address and other configuration information necessary for the switch to communicate with the local routers and the Internet. This information is also required if you plan to use the CMS to configure and manage the switch.


Note If the switch will be a cluster member managed through the IP address of the command switch, it is not necessary to assign IP information or a password. If you are configuring the switch as a standalone switch or as a command switch, you must assign IP information.


Follow these steps to create an initial configuration for the switch:


Step 1 Enter Yes at the first two prompts.

Would you like to enter the initial configuration dialog? [yes/no]: yes

At any point you may enter a question mark '?' for help.
Use ctrl-c to abort configuration dialog at any prompt.
Default settings are in square brackets '[]'.

Basic management setup configures only enough connectivity
for management of the system, extended setup will ask you
to configure each interface on the system.

Would you like to enter basic management setup? [yes/no]: yes

Step 2 Enter a host name for the switch, and press Return.

On a command switch, the host name is limited to 28 characters; on a member switch to 31 characters. Do not use -n, where n is a number, as the last character in a host name for any switch.

Enter host name [Switch]: host_name

Step 3 Enter a secret password, and press Return.

The password can be from 1 to 25 alphanumeric characters, can start with a number, is case sensitive, allows spaces, but ignores leading spaces.

Enter enable secret: secret_password

Step 4 Enter an enable password, and press Return.

Enter enable password: enable_password

Step 5 Enter a virtual terminal (Telnet) password, and press Return.

The password can be from 1 to 25 alphanumeric characters, is case sensitive, allows spaces, but ignores leading spaces.

Enter virtual terminal password: terminal-password

Step 6 (Optional) Configure the Simple Network Management Protocol (SNMP) by responding to the prompts.

Step 7 Enter the interface name (physical interface or VLAN name) of the interface that connects to the management network, and press Return. For this release, always use vlan 1 as that interface.

Enter interface name used to connect to the
management network from the above interface summary: vlan 1

Step 8 Configure the interface by entering the switch IP address and subnet mask and pressing Return:

Configuring interface vlan1:
Configure IP on this interface? [yes]: yes 
IP address for this interface: 10.4.120.106
Subnet mask for this interface [255.0.0.0]: 255.255.255.0

Step 9 Enter Y to configure the switch as the cluster command switch. Enter N to configure it as a member switch or as a standalone switch.

If you enter N, the switch appears as a candidate switch in the CMS. In this case, the message in Step 10 does not appear.

Would you like to enable as a cluster command switch? [yes/no]: yes

Step 10 Assign a name to the cluster, and press Return.

Enter cluster name: cluster_name

The cluster name can be 1 to 31 alphanumeric characters, dashes, or underscores.

The initial configuration appears:

The following configuration command script was created:

hostname host_name
enable secret 5 $1$Max7$Qgr9eXBhtcBJw3KK7bc850
enable password grandkey1
line vty 0 15
password grandkey
snmp-server community public
!
no ip routing

!
interface Vlan1
no shutdown
ip address 172.20.139.145 255.255.255.224
!
interface Vlan2
shutdown
no ip address
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
...<output abbreviated)
!!!
interface GigabitEthernet0/1
!
interface GigabitEthernet0/2
!
end

Step 11 These choices appear:

[0] Go to the IOS command prompt without saving this config.

[1] Return back to the setup without saving this config.

[2] Save this configuration to nvram and exit.

Enter your selection [2]:

Make your selection, and press Return.


After you complete the setup program, the switch can run the created default configuration. If you want to change this configuration or want to perform other management tasks, use one of these tools:

Command-line interface (CLI)

Cluster Management Suite from your browser

Configuring Browsers and Accessing CMS

For the browser to use CMS, a Java plug-in is required, as described in the "Installing the Required Plug-In" section. After you have assigned an IP address to the switch and installed the plug-in, you can access the switch from your browser and use the CMS to configure other switches. To use the web-based tools, see the "Software Compatibility" section to set up the appropriate browser options.

This section describes these installation procedures:

"Configuring Netscape Communicator (All Versions)" section

"Configuring Microsoft Internet Explorer (4.01)" section

"Configuring Microsoft Internet Explorer (5.0)" section

"Displaying the CMS Access Page" section

Configuring Netscape Communicator (All Versions)

Follow these steps to configure Netscape Communicator:


Step 1 Start Netscape Communicator.

Step 2 From the menu bar, select Edit > Preferences.

Step 3 In the Preferences window, click Advanced.

Step 4 Check the Enable Java, Enable JavaScript, and Enable Style Sheets check boxes.

Step 5 From the menu bar, select Edit > Preferences.

Step 6 In the Preferences window, click Advanced Cache, and select Every time.

Step 7 Click OK to return to the browser Home page.


Configuring Microsoft Internet Explorer (4.01)

Follow these steps to configure Microsoft Internet Explorer 4.01:


Step 1 Start Internet Explorer.

Step 2 From the menu bar, select View > Internet Options.

Step 3 In the Internet Options window, click the Advanced tab.

a. Scroll through the list of options until you see Java VM. Check the Java logging enabled and Java JIT compiler enabled check boxes.

b. Click Apply.

Step 4 In the Internet Options window, click the General tab.

a. In the Temporary Internet Files section, click Settings.

b. In the Settings window, select Every visit to the page, and click OK.


Configuring Microsoft Internet Explorer (5.0)


Note During the installation of this browser, make sure to check the Install Minimal or Customize Your Browser check box. In the Component Options window in the Internet Explorer 5 section, make sure to check the Microsoft Virtual Machine check box to display applets written in Java.


Follow these steps to configure Microsoft Internet Explorer 5.0:


Step 1 Start Internet Explorer.

Step 2 From the menu bar, select Tools > Internet Options.

Step 3 In the Internet Options window, click the Advanced tab.

a. Scroll through the list of options until you see Java VM. Check the Java logging enabled and JIT compiler for virtual machine enabled check boxes.

b. Click Apply.

Step 4 In the Internet Options window, click the General tab.

a. In the Temporary Internet Files section, click Settings.

b. In the Settings window, select Every visit to the page, and click OK.


If you are using Microsoft Internet Explorer 5.0 to make configuration changes to the switch, note that this browser does not automatically reflect the latest configuration changes. Make sure that you click Refresh for every configuration change.

Displaying the CMS Access Page

After the browser is configured, display the CMS access page:


Step 1 Enter the switch IP address in the browser Location field (Netscape Communicator) or Address field (Internet Explorer), and press Return.

Step 2 Enter your username and password when prompted. The password provides level 15 access.


Note The browser always prompts for username and password. If no username is configured on your switch, you only need to enter the enable password in the appropriate field.


The Cisco Systems Access page appears. For more information on setting passwords and privilege levels, refer to the Catalyst 2950 Desktop Switch Software Configuration Guide.

Step 3 Click Web Console to launch the CMS applet.

If you access CMS from a standalone or a cluster-member switch, Device Manager appears.


New Features

These are the new supported hardware and the new software features provided in IOS Release 12.1(9)EA1.

"New Hardware Features" section

"New Software Features" section

New Hardware Features

For a list of supported hardware, see the "Hardware Supported" section.

New Software Features

Cisco IOS Release 12.1(9)EA1 contains these new features or enhancements:

Cisco Intelligence Engine 2100 (IE2100) Series Cisco Networking Services (CNS) embedded agents for automating switch management, configuration storage, and delivery (available only in the enhanced software image)

Voice VLAN for creating subnets for voice traffic from Cisco IP Phones

IEEE 802.1S Multiple Spanning Tree Protocol (MSTP) for grouping VLANs into a spanning-tree instance and for providing for multiple forwarding paths for data traffic and load balancing (available only in the enhanced software image)

IEEE 802.1W Rapid Spanning Tree Protocol (RSTP) for rapid convergence of the spanning tree by immediately transitioning root and designated ports to the forwarding state (available only in the enhanced software image)

IGMP filtering that controls the set of multicast groups to which a switch port can belong by defining IP multicast profiles and associating them with individual switch ports. An IGMP profile can contain one or more multicast groups and specifies whether access to the group is permitted or denied. If an IGMP profile denying access to a multicast group is applied to a switch port, the IGMP join report requesting the stream of IP multicast traffic is dropped, and the port is not allowed to receive IP multicast traffic from that group.

Port security MAC aging to set the aging time for secure addresses on a port

Support for VLAN IDs in the full 1 to 4094 range allowed by the IEEE 802.1Q standard (available only in the enhanced software image) and a new configuration mode (config-vlan)

CMS support for these features:

Voice VLANs

Extended VLAN IDs (VLAN IDs 1006 to 4094) (available only in the enhanced software image)

Limitations and Restrictions

You should review this section before you begin working with the switches. 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.

These are the limitations and restrictions:

"Hardware and Software Compatibility Matrixes" section

"Port Configuration Conflicts" section

"SPAN Limitations" section

Hardware and Software Compatibility Matrixes

Some switches are not supported by certain software releases. In Table 7 and Table 8, Yes means that the switch is supported by the software release; No means that the switch is not supported by the release.

Table 7 lists the Catalyst 2950-12, 2950-24, 2950C-24, and 2950T-24 switches and the software releases supporting them. The serial numbers are on the switch rear panel.

Table 8 lists the Catalyst 2950G-12-EI, 2950G-24-EI, 2950G-24-EI-DC, and 2950G-48-EI switches and the software releases supporting them. The serial numbers are on the switch rear panel.

Table 7 Catalyst 2950-12, 2950-24, 2950C-24, and 2950T-24 Switches  

Hardware
Serial Number
Release 12.0(5)WC2b or Earlier
Release 12.1(6)EA2, Release 12.1(6)EA2a, and Release 12.1(6)EA2b
Release 12.1(6)EA2c
Release 12.1(9)EA1

Catalyst 2950-12

Any serial number beginning with FAA or FAB

Yes

No

Yes

Yes

Lower than FOC0616W1H6 or
FHK0616W34M

Yes

No

Yes

Yes

FOC0616W1H6, FHK0616W34M, or higher

No

No

Yes

Yes

Catalyst 2950-24

Any serial number beginning with FAA or FAB

Yes

No

Yes

Yes

Lower than FOC0616Z1ZM or FHK0617Y0N3

Yes

No

Yes

Yes

FOC0616Z1ZM, FHK0617Y0N3,
or higher

No

No

Yes

Yes

Catalyst 2950C-24

Any serial number beginning with FAA or FAB

Yes

Yes

Yes

Yes

Lower than FOC0616TOJH or FHK0617W0YA

Yes

Yes

Yes

Yes

FOC0616TOJH, FHK0617W0YA,
or higher

No

No

Yes

Yes

Catalyst 2950T-24

Any serial number beginning with FAA or FAB

Yes

Yes

Yes

Yes

Lower than FOC0617X11P or FHK0617Y1M2

Yes

Yes

Yes

Yes

FOC0617X11P, FHK0617Y1M2,
or higher

No

No

Yes

Yes


Table 8 Catalyst 2950G-12-EI, 2950G-24-EI, 2950G-24-EI-DC, and 2950G-48-EI Switches 

Hardware
Release 12.0(5)WC2b or Earlier
Release 12.1(6)EA2, Release 12.1(6)EA2a, and Release 12.1(6)EA2b
Release 12.1(6)EA2c
Release 12.1(9)EA1

Catalyst 2950G-12-EI

No

Yes

Yes

Yes

Catalyst 2950G-24-EI 

No

Yes

Yes

Yes

Catalyst 2950G-24-EI-DC

No

Yes

Yes

Yes

Catalyst 2950G-48-EI

No

Yes

Yes

Yes


Port Configuration Conflicts

Certain combinations of port features create configuration conflicts (see Table 9). If you try to enable incompatible features, CMS issues a warning message, and you cannot make the change. Reload the page to refresh CMS.

In Table 9, No means that the two referenced features are incompatible, and both should not be enabled; Yes means that both can be enabled at the same time and do not cause an incompatibility conflict. A dash means not applicable.

Table 9 Conflicting Features 

 
Port Group
Port Security
SPAN Source Port
SPAN Destination Port
Connect to Cluster?
Protected Port
802.1X Port
Port Group

-

No

Yes

No

Yes

Yes

No

Port Security

No

-

Yes

No

Yes

No

No

SPAN Source Port

Yes

Yes

-

No

Yes

Yes1

Yes

SPAN Destination Port

No

No

No

-

Yes

Yes

No

Connect to Cluster

Yes

Yes

Yes

Yes

-

Yes

-

Protected Port

Yes

No

Yes1

Yes1

Yes

-

-

802.1X Port

No

No

Yes

No

-

-

-

1 Switch Port Analyzer (SPAN) can operate only if the monitor port or the port being monitored is not a protected port.


SPAN Limitations

When using the Switched Port Analyzer (SPAN) feature, the monitoring port receives copies of sent and received traffic for all monitored ports. If the monitoring port is 50 percent oversubscribed for a sustained period of time, it will probably become congested. One or more of the ports being monitored might also experience a slowdown.

Important Notes

This section describes important information related to this IOS release. These sections are included:

"Read-Only Mode in CMS" section

"Connecting Catalyst 2950G-24-EI-DC Switches to Compatible Devices" section

"Changing the Management VLAN" section

Read-Only Mode in CMS

CMS provides two levels of access to the configuration options. If your privilege level is 15, you have read-write access to CMS. If your switch privilege level is from 1 to 14, you have read-only access to CMS. In the read-only mode, some show commands are not available when these switches are running these software releases:

Catalyst 2900 XL or Catalyst 3500 XL member switches running Cisco IOS Release 12.0(5)WC2 or earlier

Catalyst 2950 member switches running Cisco IOS Release 12.0(5)WC2 or earlier

Catalyst 3550 member switches running Cisco IOS Release 12.1(6)EA1 or earlier

Therefore, the windows that use these show commands do not display data. These windows display an error message.

In the Front Panel view or Topology view, CMS does not display error messages. In the Front Panel view, if the switch is running one of the software releases listed previously, the device LEDs do not appear. In Topology view, if the member is an LRE switch, the customer premises equipment (CPEs) connected to the switch do not appear. The Bandwidth and Link graphs also do not appear in these views.

To view switch information, you need to upgrade the member switch software. For information about upgrading switch software, see the "Downloading Software" section.

Connecting Catalyst 2950G-24-EI-DC Switches to Compatible Devices

When connecting the ports on Catalyst 2950G-24-EI-DC switches to compatible devices, follow these guidelines:


Caution To comply with the intrabuilding lightning surge requirements, intrabuilding wiring must be shielded, and the shield for the wiring must be grounded at both ends.


Caution The Catalyst 2950G-24-EI-DC switch is suitable only for intrabuilding or nonexposed wiring connections.

Changing the Management VLAN

The management interface configuration command is not supported in Release 12.1(6)EA2 or later. To shut down the current management VLAN interface and to enable the new management VLAN interface, use the shutdown and no shutdown interface configuration commands. Refer to the Catalyst 2950 Desktop Switch Command Reference for information about using the shutdown interface configuration command.

IGMP Filtering

IGMP filtering controls only group specific query and membership reports, including join and leave reports. It does not control general IGMP queries.

Caveats

These are the open and resolved caveats:

"Open Caveats" section

"Resolved Caveats" section

Open Caveats

This section describes possible unexpected activity by Release 12.1(9)EA1:

CSCdx29415

In an UplinkFast network topology, the alternate port becomes the root port when the original root port loses connectivity. On switches running Release 12.1(6)EA2 or later, if connectivity is restored on the original root port, dummy multicast frames are not sent from that port.

There is no workaround.

CSCuk33625

When multicast data is received on a blocked trunk port in a VLAN on the switch, it might take unnecessary cycles to process these packets, possibly affecting the stability of the spanning tree states.

The workaround is to not send multicast data on a port that is in the STP blocked state in the VLAN on which data is sent.

CSCdw02638

If a port is configured as a secure port with the violation mode as restrict, the secure ports might process packets even after maximum limit of MAC addresses is reached, but those packets are not forwarded to other ports.

There is no workaround.

CSCdw01109

When a Catalyst 2950 switch in a cluster is the command switch of a Catalyst 3550 member switch, the Catalyst 3550 switch does not show any egress policy information in the Attach tab of the QoS Policies window.

There is no workaround.

CSCdw59136

When the Catalyst 2950 switch is in VTP transparent mode, and it receives frames from a trunk port with an unknown VLAN ID number, certain frames might be sent to the same trunk port with a VLAN ID that is the same as the switch management VLAN and a source MAC address that is the same as its destination MAC address.

The workaround is to configure the switch to nontransparent mode or to avoid frames that have an unknown VLAN ID.

CSCdw56650

When an ACL is created with different masks in Release 12.1(6)EA2 or later, you get an error message. However, when the access-list is created with different masks in Release 12.0(5)WC2 or earlier, you do not get an error message.

There is no workaround.

CSCdw06738

Traffic interruption can occur for several seconds during a cross-stack UplinkFast (CSUF) root-port transition.

There is no workaround.

CSCdv90806

On the Catalyst 2950 switches, you can monitor incoming traffic on multiple ports by using the CLI; however, you can only select one port if you are using CMS.

The workaround is to use the CLI to monitor incoming traffic on multiple ports.

CSCdw10837

When a Catalyst 2950 cluster command-switch is running Cisco IOS Release 12.1(6)EA2 or later and you enter the no cluster commander-address global configuration command on a member switch of this cluster, the member switch cannot be removed from the cluster if there are any member switches beyond that member switch.

The workaround is to enter the no cluster member n global configuration command on the command switch to remove the member from the cluster.

CSCdt27223

When you enter the show controllers ethernet-controller interface-id or show interfaces interface-id counters privileged EXEC command, if a large number of erroneous frames are received on an interface, the receive-error counts might be smaller than the actual values, and the receive-unicast frame count might be larger than the actual frame count.

There is no workaround.

CSCdt09918

If the cluster command-switch is a Catalyst 2900 XL switch, a Catalyst 2950 switch running software earlier than Release 12.1(6)EA2, or a Catalyst 3500 XL switch that is connected to a Catalyst 2950 switch running Release 12.1(6)EA2 or later or to a Catalyst 3550 switch, the command switch does not find any cluster candidates beyond the Catalyst 2950 or 3550 switch if it is not a member of the cluster.

The workaround is to add the Catalyst 2950 or 3550 switch to the cluster. You can then see any cluster candidates connected to it.

CSCdw06074

Layer 3 CPU packets from a SPAN-source port configured to monitor transmitted traffic are not mirrored to the SPAN-destination port on a Catalyst 2950 switch.

There is no workaround.

CSCdv82224

If a stack contains Catalyst 3550, 3500 XL, or 2900 XL switches, then the cross-stack UplinkFast (CSUF) feature does not work if the management VLAN on these switches is changed to a VLAN other than VLAN 1.

The workaround is to ensure that the management VLAN of all the Catalyst 3550, 3500 XL, and 2900 XL switches in the stack is set to VLAN 1.

CSCdv02941

In some network topologies, when UplinkFast is enabled on all Catalyst 2950 switches and BackboneFast is not enabled on all switches, a temporary loop might be caused when the STP root switch is changed.

The workaround is to enable BackboneFast on all switches.

CSCdv19671

At times, the Window-XP pop-up window might not appear while authenticating a client (supplicant) because the user information is already stored in Windows XP. However, the Extensible Authentication Protocol over LAN (EAPOL) response to the switch (authenticator) might have an empty userid that causes the 802.1X port to be deauthenticated.

The workaround is to manually re-initiate authentication by either logging off or detaching the link and then re-connecting it.

CSCdv67047

The ip http authentication enable global configuration command is not saved to the configuration file because this is the default configuration. Therefore, this configuration is lost after a reboot.

The workaround is to manually enter the command again after a reboot.

CSCdv56582

In the CMS topology view, icons for the fiber-optic, ATM, and FDDI links are not visible.

There is no workaround.

CSCdv44005

A Catalyst 2950 command switch running IOS Release 12.1(6)EA2 cannot use the rcommand privileged EXEC command to start a Telnet session on a Catalyst 3550 member running
IOS Release 12.1(4)EA1, when the aaa authorization exec default group tacacs+ global configuration command is configured on both the command switch and the member.

The workaround is to upgrade the Catalyst 3550 switch to IOS Release 12.1(6)EA1a.

CSCdv34505

The Catalyst 2950 command switch might not show the Catalyst 1900, Catalyst 2820, and Catalyst 2900 XL 4-MB (models C2908-XL, C2916M-XL, C2924C-XL, and C2924-XL) switches as candidates even though their management VLAN is the same as the command switch. This occurs only when their management VLAN is not VLAN 1.

There is no workaround.

CSCdv62271

There might be a link on the Fast Ethernet port of the Catalyst 2950switch when it is forced to 10 Mbps and full-duplex mode and its link partner is forced to 100 Mbps and forced duplex mode. The LED on the Catalyst 2950 switch might display the link, and the error counters might increment.

The workaround is to configure both sides of a link to the same speed or use auto-negotiation.

CSCdu83640

The receive count output for the show controllers ethernet-controller interface-id privileged EXEC command shows the incoming packets count before the ASIC makes a decision of whether to drop the packet or not. Therefore, for ports in the STP blocking states, even though the receive count shows incoming frames, the packet is not forwarded to the other port.

There is no workaround.

CSCdv49871

A Catalyst 2950 command switch can discover only the first Catalyst 3550 switch if the link between the Catalyst 3550 switches is an 802.1Q trunk and the native VLAN is not the same as the management VLAN of the Catalyst 2950 switch or if the link between the Catalyst 3550 switches is an ISL trunk and the management VLAN is not VLAN 1.

The workaround is to connect Catalyst 3550 switches by using the access link on the command switches management VLAN or to configure an 802.1Q trunk with a native VLAN that is the same as the management VLAN of the command switch.

CSCdv27247

If two Catalyst 2950 switches are used in a network and if access ports are used to connect two different VLANs whose VLAN IDs are separated by the correct multiple of 64, it is possible to create a situation where the two switches use the same bridge ID in the same spanning-tree instances. This might cause a loss of connectivity in the VLAN as the spanning tree blocks the ports that should be forwarding.

The workaround is to not cross-connect VLANs. For example, do not use an access port to connect VLAN 1 to VLAN 65 on either the same switch or from one switch to another switch.

CSCdv45190

On a Catalyst 2950 switch, the Multicast VLAN Registration (MVR) receiver port joins only 255 groups when the Internet Group Management Protocol (IGMP) join message is sent to all 256 MVR groups configured. Multicast data for the 256th group is not received.

The workaround is to set the mode to dynamic for Catalyst 2950 switches that are connected to IGMP-capable devices. Then, MVR members can join any group but can only support 255 IP multicast streams at any given time.

CSCdt24814 (formerly CSCdt2481)

A source-based distribution port group does not share the broadcast with all the group members. When the destination of the packets is a broadcast or unknown unicast or multicast, the packets are forwarded only on one port member of a port group, instead of being shared among all members of the port group.

There is no workaround.

CSCdt48011

Two problems occur when the Catalyst 2950 switch is in transparent mode:

If the switch is a leaf switch, any new VLANs added to it are not propagated upstream through VTP messages. As a result, the switch does not receive flooded traffic for that VLAN.

If the switch is connected to two VTP servers, it forwards their pruning messages. If the switch has a port on a VLAN that is not requested by other servers through their pruning messages, it does not receive flooded traffic for that VLAN.

There is no workaround.

CSCds20365

Internal loopback in half-duplex mode causes input errors. We recommend that you configure the PHY to operate in full duplex before setting the internal loopback.

There is no workaround.

CSCdt83016

When the Catalyst 2950 switch boots up without being configured, it prompts the user with a configuration dialog. The switch allows the user to omit the dialog and to enable traps without configuring a community string. If the host trap receiver is configured without defining the community strings, when the switch attempts to generate a trap, it fails and displays an error message.

The workaround is to follow the configuration sequence by creating a community string before configuring traps for the host.

CSCdr96565

Aging of dynamic addresses does not always occur exactly after the specified aging time elapses. It might take up to three times this time period before the entries are removed from the table.

There is no workaround.

CSCdt48569

If any VLAN other than VLAN 1 is configured as the management VLAN, the switch reports an incorrect shutdown for VLAN 1. VLAN 1 is not administratively down, even though the running configuration has shut down in VLAN 1.

There is no workaround.

CSCds68177

The UniDirectional Link Detection (UDLD) protocol does not always detect a unidirectional link when there is a loop between the TX and RX strands on the same port (TX/RX loop condition).

This is an intermittent problem, and there is no workaround.

CSCds58369

If the switch gets configured from the dynamic IP pool, a duplicate or different IP address might be assigned.

The workaround is to make sure that the DHCP server contains reserved addresses that are bound to each switch by the switch hardware address so that the switch does not obtain its IP address from the dynamic pool.

CSCdp67822

CMS requires a Java plug-in from Sun Microsystems. If you are using Internet Explorer and you disable Java plug-ins by using the Java Plug-In Control Panel, the initial Splash screen shows that the plug-in and Java are enabled, but Internet Explorer fails.

The workaround is to not disable Java plug-ins on the Java Plug-In Control Panel.

CSCdp82224

The CMS Time Management window supports the configuration of the Network Time Protocol (NTP) and system time. When you make changes on this window from a command switch, Java propagates the changes to all cluster members. A conflict can arise if you configure NTP and also use the Set Daylight Saving Time and Set Current Time tabs.

To avoid a possible conflict, either set the system time for the entire cluster on the command switch, or configure NTP on the command switch to use an NTP server to provide time to the cluster. Do not use both methods at the same time.

CSCdp82354

You can use Cluster Manager to configure an Hot Standby Router Protocol (HSRP) standby group and bind it to a cluster. However, you cannot use Cluster Manager to configure more than one standby group. If you want to configure more than one standby group, use the CLI.

There is no workaround.

CSCdp70389

When changing the management VLAN on a cluster with command-switch redundancy enabled, the cluster can break if HSRP is configured on any of the cluster members in the new management VLAN.

The workaround is to not change the management VLAN to a VLAN where a member is configured as part of a standby group.

CSCdp85954

Root guard is inconsistent when configured on a port that is in the STP blocked state at the time of configuration.

There is no workaround.

CSCdp49419

HSRP does not support a virtual MAC address entry or a built-in address (BIA) for a cluster.

There is no workaround.

CSCdp97517

All members of an HSRP standby group must be cluster members.

There is no workaround.

CSCdp30543

If the storm control filter is enabled for unicast or multicast traffic and the rising threshold is reached, all traffic on the port is filtered. No unicast, multicast, or broadcast traffic is forwarded from the port.

There is no workaround.

CSCdp87748

Cisco IOS does perform some checks on entered IP addresses. For example, it does not allow the broadcast address to be entered. However, it does not check for the broadcast address on the same subnet as the HSRP Versatile Interface Processor (VIP) or the management VLAN IP address. This means that you could configure HSRP with a virtual IP address that is the same as the network broadcast address.

There is no workaround.

CSCdp75220

If you use the command switch Domain Name System (DNS) server name to start CMS for a member that is running an earlier software release, CMS might not display the switch image, or it might display the command switch image. This can also occur when a standby group is configured for a cluster and you access CMS by entering the command-switch IP address and not the virtual IP address.

The workaround is to always use the command-switch IP address to access CMS. If a standby group is configured for a cluster, always use the virtual IP address to access CMS.

CSCdp62807

If you click the list of switches in CMS and press the Page Down key on the keyboard, the entire list moves to the bottom of the window. This only happens with Windows NT.

The workaround is to collapse the list into a single icon, which returns the list to the top of the window.

Resolved Caveats

These problems were resolved in IOS Release 12.1(9)EA1:

CSCdx28103

If the link between two switches is up and PAgP is configured on both switches, traffic is now forwarded correctly.

CSCdx25795

In the show interfaces command output, the interface status is no longer inconsistent when the switch boots or when a link is up or down.

CSCdw19137

When you are using the AVVID Voice Wizard in CMS, cluster members no longer fail if the client PC or workstation running CMS is not connected to the cluster through the command switch.

CSCdv90806

On the Catalyst 2950 switches, you can now monitor incoming traffic on multiple ports by using CMS.

CSCdw78767

If more than 14 interfaces are added to a multicast static MAC address, the switch no longer loses the entire entry after a reload.

CSCdw15773

If the MVR query-response time on an MVR receiver port is set to the default value (0.5 seconds), when the receiver port leaves a multicast group and rejoins it, the receiver port now sends or receives traffic in less than 10 seconds.

CSCdw11223

If you configure an SNMP community string larger than 123 characters and then configure a VLAN with an ID greater than 99, the Catalyst 2950 switch no longer resets and restarts.

These problems were resolved in IOS Release 12.1(6)EA2c:

CSCdx35868

When a switch boots and CDP is disabled, the switch no longer sends CDP information.

CSCdx29411

In an UplinkFast network topology, the time needed to transition the port state is now correct.

CSCdx08423

Forwarding notifications are no longer lost after a reload when spanning tree is disabled in VLANs other than VLAN 1.

CSCdx14342

When IGMP snooping is enabled on the Catalyst 2950 switch, the Enhanced Interior Gateway Routing Protocol (EIGRP) packets are flooded to all the ports in the VLAN.

CSCdw84685

When a corrupted STP packet has a maximum age between 0 and 1 second, the switch no longer ages out the bridge protocol data units (BDPU). This causes a new spanning-tree root to be elected.

CSCdw86042

If a non-existent VLAN is configured as the MVR VLAN, the switch no longer reloads when it receives IGMP reports for the MVR group on a receiver port.

CSCdw69197

When a cluster of Catalyst 2950 switches is powered on with STP UplinkFast enabled, it no longer creates a spanning-tree loop.

CSCdw75885

When a topology change occurs, all the multicast MAC entries and the multicast router port entries are no longer deleted.

CSCdw08097

When there is a link failure between two Fast Ethernet ports on two Catalyst 2950 switches, the fail-over now works correctly. The MAC address is relearned on the secondary channel when the primary channel fails.

CSCdv14833

When you enter the show running-config or write memory privileged EXEC command, it no longer takes up to 8 seconds before the current configuration appears on the Catalyst 2950 switch.

These problems were resolved in Cisco IOS Release 12.1(6)EA2b:

CSCdw65903

An error can occur with management protocol processing. Please use the following URL for further information:

http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCdw65903

CSCdw72130

A command switch no longer fails when it receives SNMP packets that have invalid variable bindings.

This problem was resolved in Cisco IOS Release 12.1(6)EA2a:

CSCdw29898

When you are using the Remote Authentication Dial-In User Service (RADUIS) client for Extensible Authentication Protocol (EAP) authentication, the Microsoft Windows2000 Internet Authentication Server authenticates only users with valid passwords.

These problems were resolved in Cisco IOS Release 12.1(6)EA2:

CSCdv35805

If you are copying the configuration file using ciscoConfigCopyMIB from a Catalyst 2950 switch by using Simple Network Management Protocol (SNMP) manager, the switch no longer reloads the configuration.

CSCdv16305

A broadcast storm no longer occurs when two 100BASE-FX ports on a Catalyst 2950 switch are connected to the 100BASE-FX ports on another Catalyst 2950 switch if these ports are in trunk mode and one of the ports is administratively down.

CSCds72421

If the management VLAN is changed to any other VLAN from VLAN 1 and VLAN 1 is shut down, the IP address configured in the new management VLAN now appears in the show cdp neighbor detail privileged EXEC command output.

CSCdt57346

When you enter the show rmon history user EXEC command, the value for the collision is now unique for each sample.

CSCdu09410

The ifSpeed of the interfaces now reports the default value of the visible bandwidth when the link is down and reports the configured and assigned values when the link is up.

CSCdu37367

The clear counters and clear counters fastethernet port interface configuration commands now clear the port security counters. These commands also clear the other counters for the interface.

CSCdu49099

Changing the VLAN Trunking Protocol (VTP) mode to transparent no longer causes a virtual type terminal session to lock up when executing commands, such as the show vlan privileged EXEC command, that require access to the VLAN- and VTP-related data.

In addition, ports that were shut down during VTP mode change now come back up automatically when VTP is stable.

CSCdu67033

The output count displayed by the show interface privileged EXEC command output now appears correctly when the count is greater than 4,294,967,296 packets.

CSCdu88701

When performing an snmpwalk SNMP operation on the dot1dTpFdbTable (1.3.6.1.2.1.17.4.3), the response no longer omits all entries of show mac in the display in which the first byte of the host MAC address is greater than 0x00.

CSCdv21552

High CPU utilization no longer occurs when a switch boots with a VLAN (without an IP address) in the shutdown state while another active VLAN has an IP address.

CSCdv41819

Enabling spanning-tree UplinkFast no longer causes brief spanning-tree loops if the configuration message from the root switch of the spanning tree ages out.

CSCdt04001

When you change the privilege level for an interface on the Catalyst 2950 switches, you can execute commands with the newly configured privilege level. The switch now saves the arguments associated with the command, and after a reload, the configured commands are executable.

CSCdt24089

If the Catalyst 2950 switch contains multicast addresses, the MIB walk of Dot1dTpFdbEntry no longer takes excess CPU cycles on the switch.

CSCdt68204

If you continuously ping a switch from a PC and the links from the switch to the network are brought down, when the link from the switch to the network is restored, pinging now resumes.

CSCdt59751

The no snmp-server enable traps snmp [authentication] global configuration command is not supported by this software release.

CSCdu87426

The 100BASE-FX ports in a Fast EtherChannel port group no longer loop packets when the connected device resets or reloads.

CSCdv47498

The SNMP walk of the Dot1dTpFdbTable no longer causes the switch to halt and put an SNMP CPU HOG error message in the logging buffer.

CSCdv51153

SNMP MIB variables etherStatsEntry does not display any values in Cisco IOS Release 12.0(5)XU or later.

CSCdt88908

When IGMP packets are received on a port for a non-existent VLAN, the Catalyst 2950 switch no longer loses buffer space on that port.

CSCds72421

If you shut down the management VLAN on VLAN 1 on a Catalyst 2950 switch, set the management VLAN to 999, and then again use the shutdown command to shut down VLAN 1, the IP address of VLAN 999 now appears correctly in the show cdp neighbor detail command output on a connected device.

CSCdt74555

When a MAC address is learned on a member of a port group created between a Catalyst 2950 and Catalyst 2900 or 3500 XL switch, the same MAC address gets deleted and relearned on another port member of the port group on the Catalyst 2900 or 3500 XL switch. As a result, a real-time diagnostic message reporting this address relearning behavior no longer appears.

Documentation Updates

You can access all Catalyst 2950 documentation at this URL:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/index.htm

This section provides updates to the product documentation. These changes will be included in the next version of the documentation.

Modifications

Encrypted Secure Shell (SSH), described in Chapter 7, "Administering the Switch," in the Catalyst 2950 Desktop Switch Software Configuration Guide, is not available is this release.

Errors

This information corrects errors in the Catalyst 2950 Desktop Switch Software Configuration Guide.

You can configure the maximum transmission unit (MTU) size up to 1530 bytes only on the Catalyst 2950G-12-EI, 2950G-24-EI, 2950G-24-EI-DC, and 2950G-48-EI switches by entering the system mtu global configuration command.

This information corrects errors in the Catalyst 2950 Desktop Switch Hardware Installation Guide.

The 10/100/1000 ports on a Catalyst 2950T-24 switch operate only in full-duplex mode.

When connecting a Catalyst 2950G-24-EI-DC switch to the DC-input power source, you must use 18-gauge copper wire instead of the 12- or 14-gauge wire specified in the Catalyst 2950 Desktop Switch Hardware Installation Guide.

In Appendix A, "Technical Specifications," the power consumption of the Catalyst 2950G-24-EI-DC switch is 30W.

For the Catalyst 2950C-24 switch, the optical receiver sensitivity is -34.5 to -31.8 decibel milliwatt (dBm) , the optical transmitter power for 50/125-micron cabling is -23.5 to -14 dBm, and the optical transmitter power for 62.5/125-micron cabling is -20 to -14 dBm.

Related Documentation

These documents provide complete information about the switch and are available from this Cisco.com site:

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2950/index.htm

The software documents are not shipped with the product, but you can access them under the appropriate IOS software release on Cisco.com. You can order printed copies of documents with a DOC-xxxxxx= number from the Cisco.com sites and from the telephone numbers listed in the "Obtaining Documentation" section.

These publications provide more information about the switches:

Catalyst 2950 Desktop Switch Software Configuration Guide (order number DOC-7811380=)

Catalyst 2950 Desktop Switch Command Reference (order number DOC-7811381=)

Catalyst 2950 Desktop Switch System Message Guide (order number DOC-7814233=)

Catalyst 2950 Desktop Switch Hardware Installation Guide (order number DOC-7811157=)

Catalyst GigaStack Gigabit Interface Converter Hardware Installation Guide (DOC-786460=)

Cluster Management Suite (CMS) online help

CWDM Passive Optical System Installation Note (not orderable but is available on Cisco.com)

1000BASE-T Gigabit Interface Converter Installation Notes (not orderable but is available on Cisco.com)

Obtaining Documentation

The following sections explain how to obtain documentation from Cisco Systems.

World Wide Web

You can access the most current Cisco documentation on the World Wide Web at the following URL:

http://www.cisco.com

Translated documentation is available at the following URL:

http://www.cisco.com/public/countries_languages.shtml

Documentation CD-ROM

Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which is shipped with your product. The Documentation CD-ROM is updated monthly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual subscription.

Ordering Documentation

Cisco documentation is available in the following ways:

Registered Cisco.com users (Cisco direct customers) can order Cisco product documentation from the Networking Products MarketPlace:

http://www.cisco.com/cgi-bin/order/order_root.pl

Registered Cisco.com users can order the Documentation CD-ROM through the online Subscription Store:

http://www.cisco.com/go/subscription

Nonregistered Cisco.com users can order documentation through a local account representative by calling Cisco corporate headquarters (California, USA) at 408 526-7208 or, elsewhere in North America, by calling 800 553-NETS (6387).

Documentation Feedback

If you are reading Cisco product documentation on Cisco.com, you can submit technical comments electronically. Click the Fax or Email option under the "Leave Feedback" at the bottom of the Cisco Documentation home page.

To submit your comments by mail, use the response card behind the front cover of your document, or write to the following address:

Cisco Systems
Attn: Document Resource Connection
170 West Tasman Drive
San Jose, CA 95134-9883

We appreciate your comments.

Obtaining Technical Assistance

Cisco provides Cisco.com as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools by using the Cisco Technical Assistance Center (TAC) Web Site. Cisco.com registered users have complete access to the technical support resources on the Cisco TAC Web Site.

Cisco.com

Cisco.com is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world.

Cisco.com is a highly integrated Internet application and a powerful, easy-to-use tool that provides a broad range of features and services to help you to

Streamline business processes and improve productivity

Resolve technical issues with online support

Download and test software packages

Order Cisco learning materials and merchandise

Register for online skill assessment, training, and certification programs

You can self-register on Cisco.com to obtain customized information and service. To access Cisco.com, go to the following URL:

http://www.cisco.com

Technical Assistance Center

The Cisco TAC is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two types of support are available through the Cisco TAC: the Cisco TAC Web Site and the Cisco TAC Escalation Center.

Inquiries to Cisco TAC are categorized according to the urgency of the issue:

Priority level 4 (P4)—You need information or assistance concerning Cisco product capabilities, product installation, or basic product configuration.

Priority level 3 (P3)—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.

Priority level 2 (P2)—Your production network is severely degraded, affecting significant aspects of business operations. No workaround is available.

Priority level 1 (P1)—Your production network is down, and a critical impact to business operations will occur if service is not restored quickly. No workaround is available.

Which Cisco TAC resource you choose is based on the priority of the problem and the conditions of service contracts, when applicable.

Cisco TAC Web Site

The Cisco TAC Web Site allows you to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC Web Site, go to the following URL:

http://www.cisco.com/tac

All customers, partners, and resellers who have a valid Cisco services contract have complete access to the technical support resources on the Cisco TAC Web Site. The Cisco TAC Web Site requires a Cisco.com login ID and password. If you have a valid service contract but do not have a login ID or password, go to the following URL to register:

http://www.cisco.com/register/

If you cannot resolve your technical issues by using the Cisco TAC Web Site, and you are a Cisco.com registered, you can open a case online by using the TAC Case Open tool at the following URL:

http://www.cisco.com/tac/caseopen

If you have Internet access, it is recommended that you open P3 and P4 cases through the Cisco TAC Web Site.

Cisco TAC Escalation Center

The Cisco TAC Escalation Center addresses issues that are classified as priority level 1 or priority level 2; these classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer will automatically open a case.

To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to the following URL:

http://www.cisco.com/warp/public/687/Directory/DirTAC.shtml

Before calling, please check with your network operations center to determine the level of Cisco support services to which your company is entitled; for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). In addition, please have available your service agreement number and your product serial number.