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

[Darren O'Connor]

If you think its spanning-tree you really need to check that it is. If it happens again make sure you console on and check the spanning-tree state before you reboot it. Are you actually running VTP? Did you turn VTP to transparent or off?

Thanks
Darren
http://www.mellowd.co.uk/ccie



> Date: Tue, 4 Mar 2014 12:41:13 -0800
> From: svoll.voip at gmail.com
> To: blake.mailinglist at pfankuch.me
> CC: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] 3750E to stack of 2960x.....
> 
> 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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