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.
(switch (config) #) Enable IGMP snooping globally:
ip igmp snooping
(switch (config) #) Enable IGMP snooping on a VLAN:
vlan 2
ip igmp snooping
(switch (config vlan 10)#) (Optional) Verify the IGMP snooping querier configuration:
show ip igmp snooping querier