Implementing Hardware and Software Redundancy on Modular Switches
How to configure and verify SRM with SSO

Use these commands to configure the MSFC for SRM with SSO operation.

NOTE:

The sso keyword is supported in Release 12.2(17b)SXA and later releases.

Configure the MSFCs for SRM with SSO
Enable SRM on the designated router first, and then enable SRM on the nondesignated router as follows:

Router>enable
Router#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#redundancy
Router(config-red)#mode sso
Router(config-red)#end

Verify SRM Configuration and Operation
This command will verify that SRM with SSO has been configured correctly on each MSFC3.

Switch#show running-config

This command will verify that SRM with SSO is currently operational on the MSFC3:

Switch#show redundancy states
Router#show redundancy states
NOTE:

Enter the copy running-config command on the designated router to ensure that the nondesignated router startup configuration has SRM enabled.

CAUTION:

Before going from Dual Router Mode (DRM) to SRM redundancy, Cisco recommends that you use the copy running-config command on the MSFCs to save the non-SRM configuration to boot flash memory. When going to SRM redundancy, the alternative configuration (the configuration following the alt keyword) is lost. Therefore, before enabling SRM redundancy, save the DRM configuration to boot flash memory by entering the following command on both MSFCs: copy running-config bootflash:nosrm_dual_router_config.