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Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter6 Configuring Supervisor Engine Redundancy Using RPR and SSO
Configuring Supervisor Engine Redundancy
•Starting with Cisco IOS Release 12.2, if an unsupported cond ition is detected (such as when the
active supervisor engine is running Release 12.2(20)EW and the redundant supervisor engine is
running Release 12.1(20)EW), the redundant supervisor engine will be reset multiple times and then
be placed in ROMMON mode. Therefore, it is important to follow the exact procedures outlined in
the “Performing a Software Upgrade” section on page 6-12.
•If you are running (or upgrading to) Release 12.2(20)E WA or Release 12.2(25)EW and are using a
single supervisor engine in a redundant chassis (Catalyst 4507R or Catalyst 4510R series switch),
and you intend to use routed ports, do one of the fol lowing:
–
Use SVI’s instead of routed ports.
–
Change the redundancy mode from SSO to RPR.
•Configuration changes made to the redundant supervisor engin e through SNMP are not
synchronized to the redundant supervisor engine.
After you configure the switch 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 redun dant
supervisor engine. Then, reload the redundant supervisor engine so that new configuration is applied
on the redundant supervisor engine.
Configuring Supervisor Engine Redundancy
These sections describe how to configure supervisor engine redundancy:
•Configuring Redundancy, page 6-8
•Synchronizing the Supervisor Engine Configurations, page 6-10

Configuring Redundancy

To configure redundancy, perform this task:
When configuring redundancy, note the following:
•The sso keyword is supported in Release 12.2(20)EWA and later releases.
•The rpr keyword is supported in Release 12.1(12c)EW and later releases.
Command Purpose
Step1 Switch(config)# redundancy Enters redundancy configuration mode.
Step2 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.
Step3 Switch# show running-config Verifies that SSO or RPR is enabled.
Step4 Switch# show redundancy
[clients | counters | history | states]
Displays the redundancy information (counter, state, and
so on) for the active and redundant supervisor engines.