Cisco Cisco IOS Software Release 12.2(27)SBC

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The NSF/SSO—MPLS VPN 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 (RP) restarts. This feature module describes how to enable Nonstop Forwarding in MPLS 
VPN networks, including the following types of VPNs:

Basic MPLS VPNs

MPLS VPN—Carrier Supporting Carrier 

MPLS VPN—Carrier Supporting Carrier—IPv4 BGP Label Distribution

MPLS VPN—Interautonomous Systems 

MPLS VPN—Inter-AS—IPv4 BGP Label Distribution

Your Cisco IOS software release may not support all of the features documented in this module. To reach 
links to specific feature documentation in this module and to see a list of the releases in which each feature is 
supported, use the 

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 

. An 

account on Cisco.com is not required.