[c-nsp] 3750E to stack of 2960x.....

[Scott Voll]

uplinks are Copper SFP's 1 gig.  all cisco branded GLC-T.  IOS on the 2960x
is latest 15 ex4 code.

I think it might be a spanning tree issue.  we found that the legacy
devices were still using pvst rather than rapid pvst.

we are going to update everything to Rapid pvst and see if we have any more
issues.  Unfortunately I was not able to see the console before someone
rebooted them.  Looks like the switches were up and working..... just the
uplinks were not.  No CDP from the 3750E.

TIA

Scott



On Tue, Mar 4, 2014 at 11:44 AM, Blake Pfankuch - Mailing List <
blake.mailinglist at pfankuch.me> wrote:

> What kind of uplinks?  Fiber or Copper?  SFP?  1gig or 10gig?  Cisco
> Branded SFP?  IOS Versions on all affected devices?
>
> Thanks,
> Blake
>
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> Scott Voll
> Sent: Tuesday, March 4, 2014 8:19 AM
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] 3750E to stack of 2960x.....
>
> I have a building that has a 3750E at the core and access layer with some
> new 2960X's
>
> I have both a stack of two and a single.
>
> Both have a port channel up to the 3750E.
>
> Both have now lost there uplinks to the 3750E within two days of being
> installed.
>
> Anyone have any ideas as to what to look for?
>
> I see nothing in the syslogs of either the 2960x or the 3750E.
>
> I'm thinking Spanning tree?  or VTP?  or ??????
>
> Areas you would look at?
>
> TIA
>
> Scott
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