Cisco 7500 SERIES ROUTE SWITCH PROCESSOR 16 Specification Guide
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Route Switch Processor (RSP16) Installation and Configuration Guide
OL-4661-03
Enabling High Availability Features
For more information on FSU, refer to the Route Processor Redundancy and Fast Software Upgrade
on Cisco 7500 Series Routers feature module available online at
on Cisco 7500 Series Routers feature module available online at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120st/120st
16/st_rpr7x.htm
16/st_rpr7x.htm
.
•
Stateful Switchover (SSO)—Based on RPR+, SSO allows the active RSP to pass the necessary state
information of key routing and interface protocols to the standby RSP upon switchover, which
reduces the time for the standby RSP to learn and converge routes.
information of key routing and interface protocols to the standby RSP upon switchover, which
reduces the time for the standby RSP to learn and converge routes.
SSO is disabled by default, and needs to be manually configured. SSO does not support the Legacy
interface processor cards. For more information on how to configure SSO, refer to the Stateful
Switchover feature module available online at
interface processor cards. For more information on how to configure SSO, refer to the Stateful
Switchover feature module available online at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s22/sso
120s.htm
120s.htm
.
•
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.
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
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
/nsf120s.htm
.
Hardware and Software Prerequisites
The HA features are available on the Cisco 7507, Cisco 7507-MX, Cisco 7513, and Cisco 7513-MX
routers, loaded with RSP16s (or an RSP16 and an RSP8), provided the RSP16 is running the 12.1(12)E
image. The following HA features became available on the following minimum software releases:
routers, loaded with RSP16s (or an RSP16 and an RSP8), provided the RSP16 is running the 12.1(12)E
image. 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
.