Cisco Cisco IOS Software Release 12.2(27)SBC

 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a 
specific command, see the command reference documentation.

Cisco IOS software images are specific to a Cisco IOS software release, a feature set, and a platform. 
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image 
support. Access Cisco Feature Navigator at 

. You must have an account on 

Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at 
the login dialog box and follow the instructions that appear.

 lists only the Cisco IOS software release that introduced support for a given feature in a given 

Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS 
software release train also support that feature.

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the Cisco Certified Internetwork Expert logo, Cisco IOS, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Cisco Unity, 
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NSF/SSO—L2VPN Pseudowire Redundancy

12.2(28)SB

This feature enables you to set up your network to detect a 
failure in the network and reroute the L2 service to another 
endpoint that can continue to provide service. This feature 
provides stateful switchover and nonstop forwarding 
support. The active pseudowire does not change after SSO.

The following sections provide information about this 
feature: