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IGMP enables hosts to inform routers when they join or leave groups. Routers periodically query hosts (query interval) for the groups in which the hosts are members. When there is more than one router in a broadcast domain (subnet), one of the routers becomes the designated querier. Only the designated router queries the hosts.
Both IGMP Version 1.0 and IGMP Version 2.0 are supported. After selecting the specific IGMP version for an interface, you can manually configure the Version 1.0 querier. The selection of the querier for Version 2.0 is dynamic but can be overridden.
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