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Route Switch Processor (RSP8) Installation and Configuration Guide
OL-4920-02
Enabling High Availability Features
•Cisco Nonstop Forwarding (NSF) —Used with SSO, NSF allows routers with redundant RSPs to
continueforwarding data to the standby RSP during a switchover. This feature uses the Forwarding
Information Base (FIB) that was current at the time of the switchover. Once the routing protocols
haveconverged, the FIB table is updated and stale route entries are deleted. This feature eliminates
downtime during the switchover. Note: Cisco NSF always runs together with SSO.
Cisco NSF is supported by the BGP, OSPF, and IS-IS protocols for routing and by Cisco Express
Forwarding (CEF) for forwarding. For more information on how to configure NSF, see theCisco
Nonstop Forwardingfeature module available online at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s22
/nsf120s.htm.
Hardware and Software Prerequisites
The RPR and FSU features are available on the Cisco7507, Cisco 7507-MX, Cisco 7513, and
Cisco 7513-MX routers, which are loaded with two route switch processors (RSPs). The router is loaded
with two route switch processors (RSPs), which can be two RSP8s, or an RSP16 and an RSP8.
The following HA features became available on the following minimum software releases:
•Single Line Card Reload (SLCR)—Cisco IOS Releases 12.0(13)S, 12.1(4)T, and 12.1(5)E
•Route Processor Redundancy (RPR)— Cisco IOS Release 12.0(16)ST
•Route Processor Redundancy Plus (RPR+)— Cisco IOS Release 12.0(19)ST
•Fast Software Upgrade (FSU)—Cisco IOS Release 12.0(16)ST
•Stateful Switchover (SSO) —Cisco IOS Release 12.0(22)S
•Nonstop Forwarding (NSF)—Cisco IOS Release 12.0(22)S
Note For current hardware and softwarecompatibility information, refer to the Software Advisor tool at
http://www.cisco.com/cgi-bin/Support/CompNav/Index.pl.
Installation Procedures
See the following sections for the configuration tasks required to run the RPR/RPR+, SSO with NSF,
FSU, and SLCR features.
•Enabling the Router, page44 (required)
•Copying an Image onto an RSP, page44 (required)
•Setting the Config-Register Boot Variable, page46 (optional)
•Configuring RPR and RPR+, page46 (optional)
•Configuring a Stateful Switchover (SSO), page49 (optional)
•Configuring Nonstop Forwarding (NSF), page52 (optional; but SSO required)
•Performing a Fast Software Upgrade, page60 (optional)
•Configuring SLCR, page62 (optional)