D-Link DES-3326 User Manual page 115

DES-3326 Layer 3 Fast Ethernet Switch User's Guide
The router with the lowest IP address is elected as the querier.
The explicit group leave message is added to decrease latency, and
routers can ask for membership reports from a particular multicast
group ID.
The transition states a host will go through to join or leave a
multicast group are shown in the diagram below.
Figure 5-18. IGMP State Transitions
Switch Management and Operating Concepts
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