Scenario - I have 3 Switched PDU that communicate amongst each other via multicasting. All 3 are on the same switch and in the same VLAN. 2 of the units see each other but the 3rd sees nothing. No filtering or ACLs involved.
My questions are;
1) On a Catalyst 2960G, IOS 12.2(25)SEE2, is there any configuration necessary to support multicast between ports on the same switch and vlan?
2) What debug commands can I run to see \ verify multicast traffic on the 2960?
Have you enabled IGMP snooping on the switch. IGMP snooping will allow the switch to listen for IGMP responses and match these to the relevent ports.
However if you don't have a Layer 3 interface in the multicast environment then there will be nothing to issue the queries. In simple terms if no one is asking the question then there will be no answers to listen for. The solution is to enable the igmp querier function on the switch. This allows the switch to make the queries.
The 2960 with your version of the software will do igmp queriering.
The default behaviour for a switch is (or always has been) to flood multicast & broadcast traffic. This is now inhibited on the 2960 by the default igmp snooping configuration. When you have a low level of multicast traffic you could consider switching off igmp snooping by using the global command: no ip igmp snooping
My assumption is that the switch will then revert to flooding this type of traffic.
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