An SRP switchover places the backup VPC-VSM instance in standby mode and makes the primary instance active. The
primary instance is now processing sessions with the upgraded software.

Step 1

Initiate the switchover by shutting down the HSRP interface being monitored by SRP. All existing sessions will be
migrated to the primary instance and it begins servicing new session requests. Allow the switchover process to
complete.

Step 2

On the backup instance, run the show srp info command. Chassis State should indicate Standby when switchover is
complete.

Step 3

On the primary instance, confirm the switchover is complete by running the show srp info command. Chassis State
should indicate Active when switchover is complete.

Checking AAA Monitor Status

If your network deployment requires communication with AAA servers, check the status of communication with AAA
servers as described in

Checking AAA Monitor Status on the Newly Active Chassis.

Making Test Calls

After verifying the VPC-VSM instance state and migrating subscribers, perform new call testing to make sure calls are
successful.

Fallback Procedure

To revert to the previous configuration and software build, perform the following steps as a user with administrative
privileges.

Step 1

Run the Exec mode show boot command. The topmost lowest numbered entry of the displayed output should be the
new configuration with the new software build. The second topmost entry should be the backup configuration.

Step 2

Remove the topmost boot entry <n>.

[local]host_name# config

[local]host_name(config)# no boot system priority n