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NetworkWorld.com > Resource Links: Encyclopedia: I

IGMP (Internet Group Management Protocol)

One of the key protocols involved in IP multicast. IGMP is used by IP hosts to report their multicast group memberships to any immediately-neighboring multicast routers. Routers that are members of multicast groups are expected to behave as hosts as well as routers, and may even respond to their own queries. IGMP is a integral part of IP. It is required to be implemented by all hosts wishing to receive IP multicasts.From RFC 2236 - Internet Group Management Protocol, Version 2


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