Cisco Catalyst 4500 series Administration Manual page 459

Chapter 11 Configuring Supervisor Engine Redundancy Using RPR and SSO on Supervisor Engine 7-E, Supervisor
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Configuring Supervisor Engine Redundancy
These sections describe how to configure supervisor engine redundancy:
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Configuring Redundancy
IOS XE software can be booted at three different levels (Enterprise Services, IP Base, and LAN Base),
Note
based on the licenses available on the supervisor engine. If you are booting the image in LAN Base
mode, only RPR redundancy mode is available.
To configure redundancy, perform this task:
Command
Step 1
Switch(config)# redundancy
Step 2
Switch(config-red)# mode {sso | rpr}
OL_28731-01
Static IP routes are maintained across a switchover because they are configured from entries in the
configuration file.
Information about Layer 3 dynamic states that is maintained on the active supervisor engine is not
synchronized to the standby supervisor engine and is lost on switchover.
If configuration changes on a redundant switch are made through SNMP set operations, the changes
are not synchronized to the standby supervisor engine even 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 to the standby supervisor engine. Then, reload the standby supervisor engine so that the new
configuration is applied on the standby 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, then reinsert the
line card, and 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 Redundancy, page 11-7
Virtual Console for Standby Supervisor Engine, page 11-9
Synchronizing the Supervisor Engine Configurations, page 11-10
Purpose
Enters redundancy configuration mode.
Configures SSO or RPR. When this command is entered,
the standby supervisor engine is reloaded and begins to
work in SSO or RPR mode.
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
Configuring Supervisor Engine Redundancy
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