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

[Scott Voll]

We have a VTP domain.  so they are set to client.

But I think we are now thinking it's a SFP issue.

we have had several 2960X's in the lab that will not recognize the SFP
(glc-t) unless we reboot.  Then they are recognized and we use them.
 Yesterday we had on stack that lost it's primary sfp and looking at the sh
interface it shows no hardware in the SFP slot.  But after a reboot it came
back to life.

I know that putting a GLC-T in a SFP+ slot is overkill, but we have not
moved our new Nexus gear in yet to move to the 10 Gig SR stuff.  in the
compatiblity matrix it shows the GLC-T as supported in the spf+ slots of
the 2960X switch.  So is this a Bug?  Bug scrub comes up with nothing.

TIA

Scott


On Thu, Mar 6, 2014 at 3:03 AM, Darren O'Connor <darrenoc at outlook.com>wrote:

> 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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> > >
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