Hi, I have 10 servers connected to a VLAN that communicate with each other using multicast. They do this through a 6509 w/SUP720s. The switch just provides L2 connectivity between the hosts, it does not have multicast routing enabled.
The problem I have is that these servers cannot communicate with each other unless IGMP snooping is turned off globally. This confuses me because although IGMP snooping is globally enabled by default, there is no multicast routing configured and thus there is no configured IGMP snooping querier configured.
Ideally I don't want to disable IGMP snooping globally, as it would be useful should the servers start sending multicast traffic over some of their other interfaces.
My understanding of IGMP snooping is that it needs a querier to work, yet in my case, it seems to be doing something without having a querier configured.
IGMP snooping is thought to optimize multicast forwarding but if no igmp queries and igmp reports can be seen on the Vlan the effect is to empty the list of ports in the vlan that can forward multicast frames for a given group.
You can configure an igmp snooping querier on the vlan for your scenario
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