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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
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Chapter 8 Configuring RPR and RPR+ Supervisor Engine Redundancy
Supervisor Engine Redundancy Guidelines and Restrictions
RPR Supervisor Engine Configuration Synchronization
During RPR mode operation, the startup-config files and the config-register configurations are
synchronized by default between the two supervisor engines. In a switchover, the new active supervisor
engine uses the current configuration.
RPR+ Supervisor Engine Configuration Synchronization
With RPR+ mode, the following operations trigger configuration synchronization:
•
When a redundant supervisor engine first comes online, the startup-config file is copied from the
active supervisor engine to the redundant supervisor engine. This synchronization overwrites any
existing startup configuration file on the redundant supervisor engine.
•
When configuration changes occur during normal operation, redundancy performs an incremental
synchronization from the active supervisor engine to the redundant supervisor engine. Redundancy
synchronizes user-entered CLI commands incrementally line-by-line from the active supervisor
engine to the redundant supervisor engine.
Even though the redundant supervisor engine is fully initialized, it only interacts with the active
supervisor engine to receive incremental changes to the configuration files as they occur. You cannot
enter CLI commands on the redundant supervisor engine.
Supervisor Engine Redundancy Guidelines and Restrictions
These sections describe supervisor engine redundancy guidelines and restrictions:
•
Redundancy Guidelines and Restrictions, page 8-4
•
RPR+ Guidelines and Restrictions, page 8-5
•
Hardware Configuration Guidelines and Restrictions, page 8-5
•
Configuration Mode Restrictions, page 8-6
Redundancy Guidelines and Restrictions
These guidelines and restrictions apply to RPR and RPR+ redundancy modes:
•
The two Gigabit Ethernet interfaces on the redundant supervisor engine are always active.
•
Supervisor engine redundancy does not provide supervisor engine mirroring or supervisor engine
load balancing. Only one supervisor engine is active.
•
Configuration changes made through SNMP are not synchronized to the redundant supervisor
engine. After you configure the router through SNMP, copy the running-config file to the
startup-config file on the active supervisor engine to trigger synchronization of the startup-config
file on the redundant supervisor engine and with RPR+, reload the redundant supervisor engine and
MSFC.
•
Supervisor engine switchover takes place after the failed supervisor engine completes a core dump.
A core dump can take up to 15 minutes. To get faster switchover time, disable core dump on the
supervisor engines.
