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When a Host Leaves a Group, How Does an IGMP Querier Judge Whether Any Other Members of the Group Exist on the Network Segment?

Latest reply: May 15, 2017 00:27:18 1067 1 0 0 0
When a Host Leaves a Group, How Does an IGMP Querier Judge Whether Any Other Members of the Group Exist on the Network Segment?
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Created May 15, 2017 00:27:18

In IGMPv1, when a host leaves a multicast group, the host does not send any message. A device considers that all multicast members have left a group when the timer of the group expires.

In IGMPv2 and IGMPv3, a host sends a Leave message when leaving a group. After receiving the Leave message, the querier sends a group-specific or source/group-specific Query message to the network segment of the host. The destination address of the Query message is the address of the multicast group and the group address in the message is also filled in with the address of the multicast group.
If other members of the group exist on the network segment, they respond with Report messages.
If no response is received when the timeout period ends, the querier considers that no member of the group exists on the network segment and cancels forwarding multicast data to the group.
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