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Multicast Listener Reports

When a host receives a multicast listener query, it identifies the groups associated with the query and determines to which groups it belongs. The host then sets a timer, with a value less than the Max Response Time field in the query, for each group to which it belongs.

When the timer expires, the host sends a multicast listener report to the group address. When a multicast router receives a report, it adds the group to the membership list for the network and sets a timer to the multicast address listening interval. If this timer expires before the router receives another multicast listener report, the router determines that the group has no members left on the network.

If the router does not receive any reports for a specific multicast group within the maximum response time, it determines that the group has no members on the network. The router does not forward subsequent multicasts for that group to the network.

MLDv2 supports an extended report format that allows you to report multiple groups and source lists in a single report. These reports are addressed to the all-MLDv2 router's multicast address (FF02::16).

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