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Re: [EXT] Multicast control with IGMP snooping
You can try moving the IGMP querier function from the router to a switch. Also refrain from using multicast-router-interface on the uplink port to the router. These may help, although they mention QFX and SRX. I'm not sure if EX-series is supported for this feature (but the command is there on my EX4300):

On Mon, Dec 09, 2019 at 10:03:05AM -0500, Norman Elton wrote:
> Hello,
> In a fairly large EX switching environment, we're using IGMP snooping
> to constrain some AV-over-IP multicast traffic. It's quite
> bandwidth-intensive, so we obviously don't want it broadcasting over
> our L2 network.
> According to The Rules, multicast traffic gets sent to any subscribed
> host interface (learned through a membership report), as well as to
> any router interface. This means that our router will see all the
> multicast on the subnet, even if none of it needs to be routed. The
> link between the L2 network and the router will get saturated with
> multicast.
> I suppose we could give the router a beefy 40G connection, and use QoS
> to handle congestion. But I was hoping to find a way to keep the
> multicast pushed down in the EX environment where it actually belongs.
> Am I missing something here?
> Norman
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