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Special Edition Using TCP/IP, Second Edition by NIIT

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Communication Between Hosts and Routers Using IGMP

The routers and hosts use IGMP to communicate group information on the network. As stated earlier, maintaining correct group information is critical in preventing IGMP messages from clogging the network. In addition, accurate group information will help in efficient transmission of multicast datagrams. The messages that are exchanged between the hosts and the routers are Host Membership Query and Host Membership Report. The messages are commonly referred to as query and report messages, respectively.

Multicast routers use the query messages to send queries to the hosts at regular time intervals to check the status of each group. To understand how a query message is used by ...

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