The Internet Group Multicast Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IP networks 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.
Relevant Configuration
Enable IGMP snooping globally. Run:
switch (config) # ip igmp snooping
Enable IGMP snooping on a VLAN. Run:
switch (config) # vlan 2
switch (config vlan 2) # ip igmp snooping
(Optional) Verify the IGMP snooping querier configuration. Run:
switch (config vlan 10)# show ip igmp snooping querier