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

[Andrew Miehs]

The port channel would be up as soon as one of the interfaces is up using
static port-channels.
Which interfaces are you using on the 2960? I know you have probably
checked, but do they stay up when you remove the cables?
You don't have any like "no negotiate auto" enabled on the interfaces?

What does (on the 2960G - as that is where I would guess the problem is)
show etherchannel summary
show int g0/? (channels in etherchannel)
show run int g0/?
show run int port?

You may want to try default the old interfaces and creating a new
port-channel...
Seems to have helped some people in the past with strange portchannel
issues...

Good luck...

Andrew





On Sun, Mar 17, 2013 at 2:28 AM, Joseph Hardeman <jwhardeman at gmail.com>wrote:

> Hi Andrew,
>
> No actually they are configured as "mode on" no LACP.  I spoke with a CCIE
> a couple of years ago and he told me that use mode on from switch to switch
> and lacp from switch to server so thats what I am putting in.
>
> Any thoughts on why the 2960's ports would turn up even with the 5010's
> ports shut down?
>
> Joe
>
>
> On Sat, Mar 16, 2013 at 12:30 AM, Andrew Miehs <andrew at 2sheds.de> wrote:
>
>> How did you configure the port channels? I assume you have configured
>> them to use lacp?
>> Show etherchannel summary shows?
>>
>>
>> Sent from a mobile device
>>
>> 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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>