IGMPv2 uses the timeout mechanism for group members leaving a group. Group members can only leave a group silently. Before the timeout period expires, multicast traffic is still forwarded by the multicast router, and this is a defect.
This statement is false because IGMPv2 improves upon IGMPv1 by introducing the Leave Group message.
In IGMPv1, members leave silently, and the router waits for the timeout.
In IGMPv2, a host sends a Leave Group message, prompting the router to send a Group-Specific Query to determine if other members are still present. If no responses are received, the group is pruned before timeout.
Reference from Huawei HCIP-Datacom-Core Technology Study Guide:
“IGMPv2 allows group members to actively send Leave messages, reducing unnecessary forwarding delays. This improves efficiency over IGMPv1.”
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