[c-nsp] Nexus / VPC - Management port "needed" in VPC?

[quinn snyder]

> On Nov 19, 2015, at 14:07, CiscoNSP List <CiscoNSP_list at hotmail.com> wrote:
> 
> We have a customer that is wanting to do VPC on some N9Ks and also N3Ks - I "thought" VPC would be similar to VSS...i.e. dual link between the switches...but my (brief) reading up on the setup, I see some setup guides where there are dual links(2 x 10Gb, or 2 x 40Gb), plus the use of the management port for vPC peer keepalives?
> 
> 
> http://www.cisco.com/c/en/us/products/collateral/switches/nexus-3000-series-switches/white_paper_c11-685753.html
> 
> Any info on the "correct"  method to setup VPC on the Nexus would be greatly appreciated

the above is correct.

vpc requires the “data plane” (vpc peer-link) that performs synchronization using cfsoe between vpc domain peers.  it also *can* be used to forward actual data-plane traffic under failure scenarios.  its important to understand the baked-in vpc drop conditions that exist to provide loop prevention under steady-state.

the management (or some other set of layer-3 adjacencies within an isolated vrf) are used for simple heartbeats between the devices.  failure of this link does not mean catastrophic failure of the domain.  this is similar to something like ‘fast-hellos’ using an oob link when dealing with vss.

q.

--
quinn snyder | snyderq at gmail.com


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