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It has a “Delayed Leave” Problem in IGMP Operation. Where multiple IGMP client (like Set Top Box) are connected to the same port on an IGMP device, if only one IGMP client change to other multicast group (channel change), then later sends a Leave Group message and ceases to belong to that group, the IGMP device retains that IGMP client in its IGMP table and continues forwarding IGMP traffic to the IGMP client until the Queries triggers confirmation that no other group members exist on the same port. This means that the switch continues to transmit unnecessary multicast traffic through the port until the Queries renews the multicast group status.
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This feature (IGMP fast leave) is to improve the “Delayed Leave” Problem. When the IGMP device received leave Group message from IGMP client immediately the IGMP device sends the Query to the IGMP client.
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If the IGMP client has no any response in a certain time, the Switch removes the IGMP client from the multicast group.
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