Cisco Cisco IOS Software Release 12.4(22)YB

© 2009 Cisco Systems, Inc. All rights reserved.

The following features were introduced in Cisco IOS Release 12.4(22)YB, Cisco IOS Release 

12.4(22)YB1, Cisco IOS Release 12.4(22)YB3, and Cisco IOS Release 12.4(22)YB4. Links to feature 

documentation are also included. 

Feature guides may contain information about more than one feature. To find information about a 
specific feature within a feature guide, see the Feature Information table at the end of the guide. 

Feature guides document features that are supported on many different software releases and platforms. 
Your Cisco IOS software release or platform may not support all the features documented in a feature 
guide. See the Feature Information table at the end of the feature guide for information about which 
features in that guide are supported in your software release. Use Cisco Feature Navigator to find 
information about platform support and Cisco IOS and Catalyst OS software image support. To access 
Cisco Feature Navigator, go to

 http://www.cisco.com/go/cfn

. An account on Cisco.com is not required.

For the latest feature information and caveats, see the release notes for your platform and software 
release at: 

See the following sections for a list of features: