UNICOM Electric SmartGST-2402M - Manual (Page 55)

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IGMP should be enabled when the router’s IP address is not smaller than other
switches in the subnet. This switch supports IGMP protocol but IGMP must be enabled
and the Router must be the Querier.
The following topology must be set when the IP address of the switch is not the smallest
in the subnet. The network will cause a multi-cast storm from the IGMP client report if it
is in Auto Mode. All switches must be in disable mode when the VOD server is
configured for IGMP Querier.