Nexus 5K VPC Peer-Link

Unanswered Question
Jun 4th, 2010

Hi All:

I just want to confirm I understand the VPC Peer-Link correctly.  We have 2 6509 VSS as cores and 2 N5K's using VPC.  If 2 servers were single connected to the N5k on an "orphaned" port (one server on each 5k), how will this traffic flow between the two servers?  From what I understand, this traffic flow would be sent through the 6509's.  It would not normally traverse the 5k peer-link, correct?  If we wanted the traffic to flow directly between the 2 N5k's, we would need to setup a seperate physical trunk between the 2 N5k's?

Thanks,

Patrick

I have this problem too.
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belovell Fri, 06/04/2010 - 10:38

This will most likely work but is not a cisco recommended design and if you did run into a forwarding problem speciffic to this scenario it's not 100% that the developers would consider it supported and fix the bug. If this was a 7K there would be a few additional gotchas that would make it an even worse idea. On a 5K you can likely get away with it but the short answer is don't do it.

-Ben

Patrick Murphy Mon, 06/07/2010 - 08:18

Thanks for the confirmation.  I definately don't want to setup a seperate direct connection between the N5K for data traffic.  Like, you said, there are a host of caveats that will pop up.

Thanks,

Patrick

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