Cisco IOS Software Releases 12.4 Mainline

Cross-Platform Release Notes for Cisco IOS Release 12.4, Part 1: System Requirements

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Release Notes for Cisco IOS Release 12.4

Table Of Contents

Release Notes for Cisco IOS Release 12.4


Cross-Platform System Requirements

Supported Hardware Platforms

Determining Your Software Version

Upgrading to a New Release

Release Notes for Cisco IOS Release 12.4

April 24, 2009

Cisco IOS Release 12.4(25)

Text Part Number OL-7661-15

Note See the "Important Notes" section for important information about Cisco IOS Release 12.4.

These release notes support Cisco IOS Release 12.4. They are updated to describe new memory requirements, hardware support, software platform deferrals, and related documents.

For a list of the software caveats that apply to Cisco IOS Release 12.4, see the Caveats for Cisco IOS Release 12.4 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

Memory Recommendations

Platform-Specific Information

New and Changed Information


Limitations and Restrictions

Important Notes

Caveats for Cisco IOS Release 12.4


Related Documentation


Obtaining Documentation and Submitting a Service Request

Cross-Platform System Requirements

This section describes the system requirements for Cisco IOS Release 12.4 and includes the following sections:

Supported Hardware Platforms

Determining Your Software Version

Upgrading to a New Release

Supported Hardware Platforms

Cisco IOS Release 12.4 supports the following Cisco hardware platforms:

SOHO 70 and SOHO 90 series routers

Cisco 3700 series routers

Cisco Small Business 100 series routers

Cisco 3800 series routers

Cisco VG224 analog gateway

Cisco Catalyst 4500 access gateway modules

Cisco 800 series routers

Cisco AS5350 and Cisco AS5350XM universal gateways

Cisco 1700 series routers

Cisco AS5400, Cisco AS5400HPX, and Cisco AS5400XM universal gateways

Cisco 1800 series routers (modular)

Cisco AS5850 universal gateways

Cisco MWR 1900 series routers

Cisco Catalyst 6000/Cisco 7600 MWAM

Cisco IAD2430 series

Cisco Catalyst 6500/Cisco 7600 communication media module

Cisco 2600XM series and Cisco 2691

Cisco 7000 family routers

Cisco 2800 series routers

Cisco IGX 8400 series URM

Cisco 3200 series mobile access routers

Cisco MGX 8850 route processor modules

Cisco 3600 series routers

Cisco signaling link terminals

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

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) 12.4 Software (C2600-I-MZ), Version 12.4(1), RELEASE SOFTWARE

Upgrading to a New Release

For information about selecting a new Cisco IOS software release, see How to Choose a Cisco IOS Software Release at the following URL:

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

Cisco Small Business 100 Series Routers

Cisco 1700 Series Routers

Cisco 1800 Series Routers

Cisco MWR 1900 Series Routers

Cisco IAD2430 Integrated Access Device

Cisco 2600XM and Cisco 2691 Series Routers

Cisco 2800 Series Routers

Cisco 3200 Series Mobile Access Routers

Cisco 3600 Series Multiservice Platforms

Cisco 3700 Series Routers

Cisco 3800 Series Routers

Cisco Catalyst 4500 Series Switches

Cisco AS5350 Series Universal Gateways

Cisco AS5400 Series Universal Gateways

Cisco AS5850 Series Universal Gateways

Cisco Catalyst 6500/Cisco 7600 Communication Media Module

Cisco 7000 Series Routers

For instructions on ordering a Cisco IOS upgrade, see the document at the following location:

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 the following URL: