vpc bind-vrf on Nexus 7000/N7k to ensure forwarding of multicast traffic over peer-link?

[sstrack]

In previous vPC setups with N5k (or also N6k), I had to use the 'vpc bind-vrf' command to ensure the forwarding of multicast over the vpc peer-link, especially for receivers in in non-vPC VLANs and the receivers connected to Layer 3 interfaces.

I am wondering why this command isn't available on N7k? Isn't this necessary on this platform or is it just not yet implemented?

Any hint is welcome!

Stephan Strack

[Andrew Gossett · Accepted solution]

Hey Stephan,

The 'vpc bind-vrf' command allocates a special internal VLAN for routing traffic over the vPC peer-link to ensure L3 connections on the vPC peer or orphan ports successfully receive multicast traffic on N5k/N6k platforms.  This workaround is not needed on the N7K because that platform implements the vPC loop prevention rule differently in hardware.

In short, 'vpc bind-vrf' is not required on N7K.

-Andy

[sstrack]

Hi Andy, thank you very much for answering this question - I did already suppose that it works with the N7K without configuration of such a command. But it is really good to know that it behaves indeed that way Thank you very much again! Stephan!

[Lennart Jung]

Hi,

does this also apply to the N3k (3172, running 7.0(3)I7(2))?

Kind regards

Lennart