What command verifies if IGMP is running on a router?

The command "show ip igmp interface" is used to verify if IGMP (Internet Group Management Protocol) is operational on a router and provides detailed information about the IGMP configuration and status for each interface. This command gives insights into the IGMP version running, the IGMP group membership, and any relevant timers associated with multicast groups on that specific interface.

By issuing this command, network administrators can quickly identify whether IGMP is enabled, the groups the router is currently listening for, and the interface settings related to multicast traffic management. This ability to confirm IGMP's functionality is crucial for troubleshooting multicast networks and ensuring that multicast traffic is being properly managed across the router's interfaces.