We're using MS Network Load Balancing for 2 groups of 2 Win2003 TS servers. Both groups are configured for L2 multicast (no multicast IP being used) with IGMP enabled. Both groups of servers are on the same VLAN and subnet as our other servers and users. It appears as though the multicast packets are flooding the network as I can be on the far side of the network and receive L2 multicasts intended for those servers.
MS's documentation states that multicast pruning (IGMP??) is not enough to keep the packets from flooding the networking, although I thought that was the whole point of IGMP snooping?
Our switches all support IGMP snooping and have it enabled, although no other configuration has been applied. I'm curious if I'm misunderstanding how IGMP snooping works? Can anyone provide some insight into how multicast is working in this scenario and why I'm not getting the expected result - multicast session joining by participating hosts?