Cisco Cisco IOS Software Release 12.2(33)SRE

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The NSF/SSO—MPLS TE and RSVP Graceful Restart feature allows a Route Processor (RP) to recover 
from disruption in control plane service without losing its Multiprotocol Label Switching (MPLS) 
forwarding state.

Cisco nonstop forwarding (NSF) with stateful switchover (SSO) provides continuous packet forwarding, 
even during a network processor hardware or software failure. In a redundant system, the secondary 
processor recovers control plane service during a critical failure in the primary processor. SSO 
synchronizes the network state information between the primary and the secondary processor.

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.