I need a bit of assistance here.
I have the following situation.
switch-1 with multicast sources attached. this is not my switch and I have no operational/config visability of it. This has igmp-snooping enabled.
I then have a second switch-2. This is connected to switch-1.
This switch-2 has recievers that want to recieve sources from switch-1 and also from locally attached sources.
I have enabled igmp-snooping on switch-2 on the relevant vlan and set the link facing switch-1 as a multicast-router.
the recievers on switch-2 are all working fine but I am seeing all the MCAST traffic from the sources on switch-2 being pushed over the link to switch-1.
I had not expected that. I as under the impression that this would only happen if switch-1 registered an interest in recieving the traffic.
a packet capture on the inter switch link shows an IGMPv2 query to all mcast routers 224.0.0.1 coming in from switch-1.
Is this packet what is triggering the traffic push?
thank you