Hardware And Software Prerequisites - Cisco RSP2 - Route Switch Processor 2 Installation And Configuration Manual

•
•
•

Hardware and Software Prerequisites

The RPR and FSU features are available on the Cisco 7507 and Cisco 7513 routers, which are loaded
with two route switch processors (RSPs). The router is loaded with two route switch processors (RSPs),
which can be two RSP2s, or an RSP2 and an RSP4/4+.
•
•
•
•
•
•
40
Cisco 7500 Series Routers feature module, available online at
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120st/120st19/st
_rpr2.htm.
Fast Software Upgrade (FSU)—Accelerates switchover to a new software image. Fast Software
Upgrade permits users to upgrade to an interim release or next minor release Cisco IOS image by
uploading it to the standby RSP first. After loading the new Cisco IOS image on the standby RSP,
the user can issue a command to switch to the standby RSP, and all the line cards will be reloaded,
similar to what occurs in RPR. This feature allows users to upgrade Cisco IOS on their Cisco 7500
routers with much less interruption to service than previously experienced.
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
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120st/120st
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.
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
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s22/sso
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.
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
Non-Stop Forwarding (NSF)—Cisco IOS Release 12.0(22)S
OL-4923-01 B0