Cisco Cisco IOS Software Release 12.2(20)S
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Cisco Nonstop Forwarding
First Published: July 22, 2002
Last Updated: December 4, 2006
Last Updated: December 4, 2006
Cisco Nonstop Forwarding (NSF) works with the Stateful Switchover (SSO) feature in Cisco IOS
software. NSF works with SSO to minimize the amount of time a network is unavailable to its users
following a switchover. The main objective of Cisco NSF is to continue forwarding IP packets following
a Route Processor (RP) switchover.
software. NSF works with SSO to minimize the amount of time a network is unavailable to its users
following a switchover. The main objective of Cisco NSF is to continue forwarding IP packets following
a Route Processor (RP) switchover.
Finding Feature Information in This Module
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
links to specific feature documentation in this module and to see a list of the releases in which each feature is
supported, use the
Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images
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
software image support. To access Cisco Feature Navigator, go to
. An
account on Cisco.com is not required.
Note
Throughout this document, the term “Route Processor” is used to describe the route processing engine
on all networking devices, regardless of the platform designation, unless otherwise noted. For example,
on the Cisco 10000 series Internet router the RP is called the Performance Routing Engine (PRE), on the
Cisco 12000 series Internet router the RP is called the Gigabit Route Processor (GRP), and on the Cisco
7500 series router the RP is called the Route Switch Processor (RSP).
on all networking devices, regardless of the platform designation, unless otherwise noted. For example,
on the Cisco 10000 series Internet router the RP is called the Performance Routing Engine (PRE), on the
Cisco 12000 series Internet router the RP is called the Gigabit Route Processor (GRP), and on the Cisco
7500 series router the RP is called the Route Switch Processor (RSP).
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