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

[Reuben Farrelly]

Hi,

Have you read the Best Pratices guide:

http://www.cisco.com/c/dam/en/us/td/docs/switches/datacenter/sw/design/vpc_design/vpc_best_practices_design_guide.pdf

Specifically the section about vPC multicast?

Reuben


On 20/10/2016 9:27 PM, Yham wrote:
> 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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