Milan Technology MIL-SM801P - Manual (Page 61)

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4. IGMP Theory of Operation
The following three topologies detail how IGMP Query works and to be
configured within a network:
1. Auto mode needs to be enabled when the router’s IP address is smaller
than other switches in the subnet.
2. IGMP needs to be enabled when the router’s IP address is not smaller
than other switches in the subnet. This Router supports IGMP protocol, but
IGMP has to be enabled, and the Router has to be the Queryer.