Internet Layer IGMP
The Internet Group Management Protocol (IGMP) version 2 is described fully in RFC 2236. Hosts belonging to mulitcast groups use IGMP to report their memberships to local multicast routers. Three IGMP messages are relevant to this introduction, namely:
• Membership query - Used to determine which groups have members on a network
• Membership report - Used by a system to report that it is part of a multicast group
• Leave group - Used by a system when it leaves a multicast group
ARP and RARP
ARP has been replaced by Neighbor Discovery and Router Discovery.
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