The MIB module for IGMP Snooping feature. Internet Group Management Protocol (IGMP) is the protocol used by IPv4 end hosts to indicate their interest in receiving multicast traffic for certain multicast groups to neighboring multicast routers. IGMP Snooping is a switch protocol. A switch that implements IGMP Snooping listens to the IGMP messages exchanged between the hosts and router, then provides selective transmission of multicast traffic based on multicast mac destination address or multicast group address.