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

[Joseph Hardeman]

Hey Andrew,

Last night we removed one of the fibers on a port-channel that was showing
up and re-inserted it.  The link stayed down/down.  I decided then to stop
until I had a chance to do more research and try to figure out why the
interfaces and port-channels were coming up with the other side being down.


I want to put in the port channels to the vPC on the 5010 stack for
redundancy and better through put for my customers, but I also don't want
to create issues for myself.  LOL   I have one  2960 that did not come
up/up when I setup the 5010 sides.  I guess I will just have to bite the
bullet and go down and remove the port-channel configurations from the
2960's and redo them one at a time and bring the links up on the 5010's.

I am with you, I think the problem is on the 2960's even though I was told
that dual-sided vPC wasn't supported on the 5010's.  I have one dual-sided
vPC up and running to the 2960's so I don't see how it can't be done.  :-)

Thanks for the advise on defaulting the ports and re-creating the
port-channels.

Joe

On Sat, Mar 16, 2013 at 12:02 PM, Andrew Miehs <andrew at 2sheds.de> wrote:

> 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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>>>
>>
>>
>