Cisco IOS Software Releases 12.3 Mainline

Cross-Platform Release Notes for Cisco IOS Release 12.3, Part 1: System Requirements


Table Of Contents

Release Notes for Cisco IOS Release 12.3


Cross-Platform System Requirements

Supported Hardware Platforms

Determining Your Software Version

Upgrading to a New Release

Release Notes for Cisco IOS Release 12.3

March 18, 2008

Cisco IOS Release 12.3(26)


Note See the "Important Notes" section on page 232 for important information for Cisco IOS Release 12.3.

These release notes support Cisco IOS Release 12.3. They are updated to describe new hardware support, software platform deferrals, and related documents.

Cisco IOS Release 12.3(22) and all subsequent 12.3 releases are deemed "Generally Deployable." We believe that Release 12.3 is suitable for deployment anywhere in the network where the features and functionality of the release are required.

For a list of the software caveats that apply to Cisco IOS Release 12.3, see the Caveats for Cisco IOS Release 12.3 document, which accompanies these release notes. The caveats document is updated for every maintenance release and is located on

We recommend that you view the field notices for this release to see if your software or hardware platforms are affected. If you have an account on, you can find field notices at If you do not have a login account, you can find field notices at


These release notes contain the following sections:

Cross-Platform System Requirements

Feature Support, page 5

Memory Recommendations, page 6

Platform-Specific Information, page 8

New and Changed Information, page 107

MIBs, page 231

Limitations and Restrictions, page 232

Important Notes, page 232

Caveats for Cisco IOS Release 12.3, page 244

Troubleshooting, page 244

Related Documentation, page 245

Notices, page 250

Obtaining Documentation and Submitting a Service Request, page 252

Cross-Platform System Requirements

This section describes the system requirements for Cisco IOS Release 12.3 and includes the following sections:

Supported Hardware Platforms

Determining Your Software Version

Upgrading to a New Release

Supported Hardware Platforms

Cisco IOS Release 12.3 supports the following Cisco hardware platforms:

SOHO 70 series routers

Cisco Catalyst 4224 access gateway switches

Cisco CVA120 series

Cisco Catalyst 4500 access gateway modules

Cisco Voice Gateway 200

Cisco AS5300 universal access servers

Cisco 800 series routers

Cisco AS5350 universal gateways

Cisco uBR900 series

Cisco AS5400 universal gateways

Cisco 1400 series

Cisco AS5800 universal access servers

Cisco 1600/1600R series

Cisco AS5850 universal gateways

Cisco 1700 series

Cisco 6400 family1

Cisco IAD2420 series

Cisco 7000 family

Cisco 2500 series

Cisco ICS77502

Cisco 2600 series

Cisco IGX 8400 series URM

Cisco 3600 series

Cisco MGX 8850 route processor modules3

Cisco 3700 series

Cisco signaling link terminals

Cisco MC3810 multiservice access concentrators4

1 The Cisco 6400 is not supported in Cisco IOS Release 12.3(13) and later releases.

2 The Cisco ICS7750 is not supported in Cisco IOS Release 12.3(3) and later releases.

3 The Cisco MGX 8850 RPM is supported in Cisco IOS Release 12.3(3).

4 The Cisco MC3810 is not supported in Cisco IOS Release 12.3(19) and later releases.

For detailed descriptions of the new hardware features, see the "New and Changed Information" section on page 107.

Determining Your Software Version

To determine the version of Cisco IOS software that is currently running on your Cisco network device, log in to the device and enter the show version EXEC command:

Router> show version

Cisco Internetwork Operating System Software 
IOS (tm) 12.3 Software (C2600-I-MZ), Version 12.3(1), RELEASE SOFTWARE 

Upgrading to a New Release

For information about selecting a new Cisco IOS software release, please refer to How to Choose a Cisco IOS Software Release at:

For information about upgrading to a new software release, refer to the appropriate platform-specific documents:

Cisco 1400 Series Routers

Cisco 1600 Series Routers

Cisco 1700 Series Routers

Cisco IAD2420 Integrated Access Device

Cisco 2500 Series Routers

Cisco 2600 Series Multiservice Platforms

Cisco 3600 Series Multiservice Platforms

Cisco 3700 Series Multiservice Access Routers

Cisco MC3810 Multiservice Access Concentrators

Catalyst 4224 Access Gateway Switch

Cisco Catalyst 4500 Series Switches

Cisco AS5300 Series Universal Gateways

Cisco AS5400 Series Universal Gateways

Cisco AS5800 Series Universal Gateways

Cisco 6400 Series Broadband Aggregators

Cisco 7200 Series, 7300 Series, 7400 Series, and 7500 Series Routers

Cisco ICS 7700 Series Integrated Communication Systems

To choose a new Cisco IOS software release by comparing feature support or memory requirements, use Cisco Feature Navigator. Cisco Feature Navigator is a web-based tool that enables you to determine which Cisco IOS software images support a specific set of features and which features are supported in a specific Cisco IOS image. You can search by feature or by feature set (software image). Under the release section, you can compare Cisco IOS software releases side by side to display both the features unique to each software release and the features that the releases have in common.

Cisco Feature Navigator is updated regularly when major Cisco IOS software releases and technology releases occur. For the most current information, go to the Cisco Feature Navigator home page at the following URL:

To choose a new Cisco IOS software release based on information about defects that affect that software, use Bug Toolkit at: