CHAPTER
5-1
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
78-14064-04
5
Configuring RPR and RPR+
Supervisor Engine Redundancy
Release 12.1(13)E and later releases support supervisor engine redundancy with Route Processor
Redundancy (RPR) and Route Processor Redundancy Plus (RPR+). This chapter describes how to
configure supervisor engine redundancy with RPR and RPR+.
Note Enhanced high system availability (EHSA) is not supported in Release 12.1(13)E and later releases.
This chapter consists of these sections:
• Understanding Supervisor Engine Redundancy, page 5-1
• Supervisor Engine Redundancy Guidelines and Restrictions, page 5-4
• Configuring Supervisor Engine Redundancy, page 5-6
• Performing a Fast Software Upgrade, page 5-9
• Copying Files to the Redundant Supervisor Engine, page 5-10
Understanding Supervisor Engine Redundancy
These sections describe supervisor engine redundancy:
• Supervisor Engine Redundancy Overview, page 5-1
• RPR+ Operation, page 5-2
• Supervisor Engine Synchronization, page 5-3
Supervisor Engine Redundancy Overview
Cisco 7600 series routers support fault resistance by allowing a redundant supervisor engine to take over
if the primary supervisor engine fails. RPR supports a switchover time of 2 to 4 minutes and RPR+
supports a switchover time of 30 to 60 seconds.
When RPR+ mode is used, the redundant supervisor engine is fully initialized and configured, which
shortens the switchover time. The active supervisor engine checks the image version of the redundant
supervisor engine when the redundant supervisor engine comes online. If the image on the redundant
supervisor engine does not match the image on the active supervisor engine, RPR redundancy mode is used.
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