I would like to monitor a multicast group on a VLAN. I have a snoop machine connected to an access-port on the VLAN. At the moment I can see the broadcasts, some non-IP 220.127.116.11/24 multicasts, and the occasional flooded unicast packet.
What I would like to do is generate an IGMP join so that I can see the particular multicast group. But my snoop machine cannot do that. Is there any way I can do it on the switchport, much in the same way as you would do ip igmp join-group on a layer 3 interface?
How about can I force my snooping port to be an IGMP-snooping router port but just for the group I am interested in? Would that disrupt my multicast traffic, and how do I do it on a 4506 platform?