[c-nsp] VSS to vPC - vPC to Etherchannel

[Andrew Miehs]

How did you configure the port channels? I assume you have configured them to use lacp?
Show etherchannel summary shows?


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On 16/03/2013, at 13:14, Joseph Hardeman <jwhardeman at gmail.com> wrote:

> Hi Everyone,
> 
> I saw a very strange thing tonight while putting some vPC ports to a some
> access switches.  So my Topology is a VSS stack to a pair of 5010 over vPC.
> I then have an active vPC from the 5010's to one 2960G port-channel.  I
> now have this connected to several other 2960G's that are connected over
> port-channels and I was wanting to connect those 2960's directly to the
> 5010 over vPC,  Just like the first one is, for failover and redundancy.
> Now with the ports on the 5010 in shutdown and the port channel in
> shutdown, as soon as I apply the config on the port connected to a 2960,
> the ports on the 2960 go from down/down to up/up even though the 5010 ports
> are shutdown.
> 
> So several questions, why would the ports on the 2960's come up and what
> can I check to see if something else is happening.  Second, is this path a
> support configuration?  I mean, I have been told that its not "Supported By
> Cisco" so that is their way of saying "weird stuff will happen".
> 
> If I can't have vPC going to my VSS engines and then on the other side have
> vPC going to another switch, then there goes the benefit of using VSS or
> vPC and I might as well have just put everything down single links and not
> even worried about providing instant failover on the chance I loose one of
> the VSS Engines or a vPC switch.
> 
> Any thoughts on what I am seeing?  I haven't seen anything like it before.
> 
> Thanks
> 
> Joe
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