Cisco Cisco IOS Software Release 12.2(27)SBC

 lists the release history for this feature.

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 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.

NSF/SSO—MPLS VPN

12.2(25)S
12.2(28)SB
12.2(33)SRA
12.2(33)SXH

This feature allows a provider edge (PE) router or 
Autonomous System Border Router (ASBR) (with 
redundant Route Processors) to preserve data forwarding 
information in a Multiprotocol Label Switching (MPLS) 
Virtual Private Network (VPN) when the primary Route 
Processor restarts. 

In 12.2(25)S, this feature was introduced on the Cisco 7500 
series router.

In 12.2(28)SB, support was added for the Cisco 10000 
series routers. 

In 12.2(33)SRA, support was added for the Cisco 7600 
series routers.

In 12.2(33)SXH, this feature was integrated into this 
release.