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Software Configuration Guide—Release 15.0(2)SG
OL-23818-01
Chapter 8 Configuring Supervisor Engine Redundancy Using RPR and SSO
Configuring Supervisor Engine Redundancy
• Configuration changes made to the redundant supervisor engine through SNMP synchronization and
SNMP set operations in SSO mode are not synchronized to the redundant supervisor engine. Even
though you can still perform SNMP set operations in SSO mode, you might experience unexpected
behavior.
After you configure the switch through SNMP in SSO mode, 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. Reload the redundant supervisor engine so that the new
configuration is applied on the redundant supervisor engine.
• You cannot perform configuration changes during the startup (bulk) synchronization. If you attempt
to make configuration changes during this process, the following message is generated:
Config mode locked out till standby initializes
• If configuration changes occur at the same time as a supervisor engine switchover, these
configuration changes are lost.
• If you remove a line card from a redundant switch and initiate an SSO switchover, and then reinsert
the line card, all interfaces are shutdown. The rest of the original line card configuration is
preserved.
This situation only occurs if a switch had reached SSO before you removed the line card.
Configuring Supervisor Engine Redundancy
These sections describe how to configure supervisor engine redundancy:
• Configuring Redundancy, page 8-8
• Virtual Console for Standby Supervisor Engine, page 8-10
• Synchronizing the Supervisor Engine Configurations, page 8-11
Configuring Redundancy
To configure redundancy, perform this task:
When configuring redundancy, note the following:
• The sso keyword is supported in Cisco IOS Release 12.2(20)EWA and later releases.
• The rpr keyword is supported in Cisco IOS Release 12.1(12c)EW and later releases.
Command Purpose
Step 1
Switch(config)# redundancy
Enters redundancy configuration mode.
Step 2
Switch(config-red)# mode {sso | rpr}
Configures SSO or RPR. When this command is entered,
the redundant supervisor engine is reloaded and begins to
work in SSO or RPR mode.
Step 3
Switch# show running-config
Verifies that SSO or RPR is enabled.
Step 4
Switch# show redundancy
[clients | counters | history | states]
Displays the redundancy information (counter, state, and
so on) for the active and redundant supervisor engines.