How to configure the Sup engine redundancy in the Cisco 6500?

To set up the SUP engine redundancy one must have the same version of iOS. Once Sup engine redundancy is configured one switch will act as Active Sup and the other will act as standby sup engine

Cisco6500(config)# redundancy
Cisco6500(config-red)#keepalive-enable
Cisco6500(config-red)#mode sso
Cisco6500(config-red)#main-cpu
Cisco6500(config-red-main-cpu)#auto-sync running-config

SSO (Stateful Switch over) mode means it will sync the configuration every time there will be a change. Once this is done you can run the command ‘show redundancy’ to check if the sup engine redundancy is working fine.