Hi All, I have two cisco nexus 7K as core switches and two cisco 4500 as distribution/access switches. Nexus switches have vPC with each downstream 4500 switch and there is no connection between 4500 switch. Vlan100 exist on all four switches and all devices part of this vlan are connected to 4500 switches. I believe this is pretty standard design. Though vlan 100 has regular users and services that communicate over unicast but there are some devices that need to send and receive multicast. Both Multicast sender and receivers are in same vlan but receivers are spread across both 4500 switches.
In diagram (no link below), receivers connected to switch 4K-1 (where source is connected) can receive the multicast stream but receivers connected to 4K-2 don't see anything. I believe its expected behavior due to IGMP snooping enabled on switches by default but i am trying to figure out how to make receivers on other switch able to get multicast stream. I did some research and found different ways but unfortunately i don't have non-production devices to test which one actually works. Here what i found 1) configuring IGMP querier for vlan 100 on all four switches 2) only enable 'ip pim sparse-mode' under SVIs (interface vlan100) at N7K-01 & N7K-02 3) disable IGMP snooping for vlan 100 on all four switches (which i don't think a right solution) Topology Diagram https://s22.postimg.org/3tsnta4s1/topology.png Your any help will be highly appreciated. Thanks YH _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/