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CONFIDENTIAL
26-Jan-04
© 2002 Procket Networks, Inc. All rights reserved.
IGMP Enhancements
•IGMP Version 2
•multicast router with lowest IP address is elected querier
•IGMPv1 was mcast protocol specific and potentially conflicted.
•Group-Specific Query message is defined. Enables router to transmit query to specific multicast address rather than to the "all-hosts" address of 224.0.0.1
•Leave Group message is defined. Last host in group wishes to leave, it sends Leave Group message to the "all-routers" address of 224.0.0.2. Router then transmits Group-Specific query and if no reports come in, then the router removes that group from the list of group memberships for that interface
•IGMP Version 3
•Group-Source Report message is defined. Enables hosts to specify which senders it can receive or not receive data from.
•Group-Source Leave message is defined. Enables host to specify the specific IP addresses of a (source,group) that it wishes to leave.
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