Cisco Systems RSP8

Route Switch Processor (RSP8) Installation and Configuration Guide

OL-4920-02

Enabling High Availability Features

SLCRis disabled by default and needs to be manually configured. When SLCR is enabled, and more

than two linecards crash simultaneously, all line cards will be reset.

Formore information on how to configure SLCR, refer to the Cisco 7500 Single Line Card Reload

feature module at

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s13

/slcr.htm.

•RouteProcessor Redundancy (RPR)—Speeds recovery of a failed router by accelerating switchover

tothe standby RSP. The standby RSP is preinitialized with the same full Cisco IOS software image

ason the active RSP. When the active RSP fails, the standby RSP takesover. The line cards are OIR

inserted by the standby RSP during the switchover. Switchover time is reduced to 4 to 5 minutes

with RPR.

RPR is disabled by default, and needs to be manually configured. For more information on RPR,

referto 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.

•RouteProcessor Redundancy Plus (RPR+)—Like RPR, RPR+ speeds recovery of a failed router by

acceleratingswitchover to the standby RSP. The RPR+ feature, an enhancement of RPR, prevents a

VIPfrom being reset and reloaded when a switchover occurs between the active and standby RSPs.

Switchovertime is reduced because VIPs are not reset, microcode does not reload on the VIPs, and

the time needed to parse the configuration is eliminated.

Onlineremoval of the active RSP causes all line cards to reset and reload, which is equivalent to an

RPR switchover,and results in a longer switchover time. When it is necessary to remove the active

RSPfrom the system, first issue a switchover command to switch from the active RSP to the standby

RSP.

RPR+ is disabled by default, and needs to be manually configured. RPR+ does not support the

Legacy interface processor card. The system will default to RPR if the router includes an Legacy

interface processor card. For more information on how to configure RPR+, refer to the

RPR+ on 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 allowsusers to upgrade Cisco IOS on their Cisco 7500

routers with much less interruption to service than previously experienced.

Formore information on FSU, refer to the Route Processor Redundancy and Fast SoftwareUpgrade

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.

•StatefulSwitchover (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.

SSOis 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 theStateful

Switchover feature module available online at

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s22/sso

120s.htm.