Which CLI command does an engineer use to validate that the redundancy peer of a...

The eping command is used on Cisco Wireless LAN Controllers to verify that the redundancy peer in a Stateful Switchover (SSO) pair of controllers is up and connected. This command sends ECHO packets (EoIP echo packets) to the peer controller to ensure the data path connectivity is functioning. In an SSO configuration, eping verifies the EoIP tunnel between the active and standby controllers, which is critical for state synchronization and seamless failover. If eping succeeds, it confirms that both the network path and the EoIP data encapsulation between the controllers are functional. The standard ping command (Option B) tests basic IP connectivity but does not validate the EoIP data path used by the SSO redundancy mechanism. The mping command (Option D) tests mobility control path connectivity between mobility group peers, not the SSO redundancy path. The rping command (Option A) is not a standard Cisco WLC command for testing SSO peer connectivity. Reference: WLSD Study Guide — WLC SSO Troubleshooting, eping Command, Redundancy Peer Connectivity Validation.