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. Version 3 of IGMP adds support for source 
based filtering; which means the end hosts can specifically 
indicate to receive or not-receive multicast packets from 
specific source addresses. This information is used by the 
multicast routers to restrict forwarding of multicast traffic 
for the host.

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.  With IGMPv3 support, 
IGMP Snooping can potentially provide selective transmission
of multicast data based on (source address, group address) 
onto the ports that are interested. In addition to this, 
IGMP Snooping can also provide proxy reporting, report 
suppression and fast leave capabilities.