I have been doing some testing with IGMP snooping. I do not have any multicast routing setup, and am using default IGMP Snooping on a 2960 12.2(44)SE IOS.
When I start a multicast stream using VLC on an IP (220.127.116.11 for example) - the switch floods this traffic to all ports in the VLAN. Why?
I thought IGMP snooping was meant to only allow the traffic to ports that the switch notices an IGMP group join request from.
Am I missing something?