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Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter 6 Configuring Supervisor Engine Redundancy Using RPR and SSO
Configuring Supervisor Engine Redundancy
• Starting with Cisco IOS Release 12.2, if an unsupported condition 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)EWA 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 following:
–
Use SVI’s instead of routed ports.
–
Change the redundancy mode from SSO to RPR.
• Configuration changes made to the redundant supervisor engine 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 redundant
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
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.