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Hardware and Software Prerequisites
The RPR and FSU features are available on the Cisco 7507, 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:
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For current hardware and softwarecompatibility information, refer to the Software Advisor tool at
Note
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.
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OL-4920-02
Cisco Nonstop Forwarding (NSF) —Used with SSO, NSF allows routers with redundant RSPs to
continue forwarding 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
have converged, 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 the Cisco
Nonstop Forwarding feature module available online at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s22
/nsf120s.htm.
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
Enabling the Router, page 44
Copying an Image onto an RSP, page 44
Setting the Config-Register Boot Variable, page 46
Configuring RPR and RPR+, page 46
Configuring a Stateful Switchover (SSO), page 49
Configuring Nonstop Forwarding (NSF), page 52
Performing a Fast Software Upgrade, page 60
Configuring SLCR, page 62
(required)
(required)
(optional)
(optional)
(optional)
(optional; but SSO required)
(optional)
(optional)
Route Switch Processor (RSP8) Installation and Configuration Guide
Enabling High Availability Features
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