Lobos Tech LB-FEA800M - Manual (Page 60)

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Note: This Router supports IGMP protocol, but IGMP function has to be
in enable mode, and the Router has to be the Queryer.
3. This topology must be set for when the Switch’s IP address is not the
smallest in the subnet. If in Auto mode, the network will cause multi-cast
storm from the client IGMP report, the topology shown as below is
necessary to be set for.