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Multicast source always hits the mutlicast router

Hi there,

I've just being going through and doing some multicast routing for video applications.

One thing I noticed is the mutlicast from the source is always connected to the multicast router. Even when there are no receivers requesting it.

Why is this? This seems slightly inefficient. Why couldn't the router interface (configured for PIM-SM) in the multicast source network send an IGMP leave request until the source is needed.

Cheers,DB

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