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IGMP snooping switches

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Cardboard_is_great@alien.topB
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Do IGMP capable switches provide any benefit if your router isn’t IGMP capable?

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TheEthyr@alien.topB
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Sure.

IGMP snooping blocks the transmission of multicast packets to switch ports that have no listeners. This can benefit devices connected to the switch. It can even protect the router from receiving multicast traffic provided that the transmitting devices are connected to the switch.

If a transmitter is connected directly to the router, the router will flood it out on all other ports, including the port connected to the switch. But the switch may choose to not flood it on its other ports if there are no listeners.

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