The Internet Group Multicast Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IP networks. It is used to establish multicast group memberships. The host joins a multicast group by sending a join request message towards the network router, and responds to queries sent from the network router by dispatching a join report.
ip igmp snooping enable
(switch(config)#)
show ip igmp-snooping vlan 1
The show command should show IGMP enabled on the VLAN, but no IGMP querier set.