[c-nsp] Multicast within VLAN on Nexus7K over vPC

[Tim Stevenson]

Any of #1,#2,#3 will work. Assuming you don't want/need this 
multicast traffic routed, and assuming the receivers are all sending 
IGMP joins, #1 is the best option: configure a snooping querier under 
'vlan 100 config' on both VPC peers. #2 is the next best option, or 
of course required if you want to also L3 multicast route this traffic.

Hope that helps,
Tim


At 03:27 AM 10/20/2016  Thursday, Yham asserted:
>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
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Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Distinguished Engineer, Technical Marketing
Data Center Switching
Cisco - http://www.cisco.com
+1(408)526-6759