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: [email protected] > To: [email protected] > CC: [email protected] > 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 < > [email protected]> 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:[email protected]] On Behalf Of > > Scott Voll > > Sent: Tuesday, March 4, 2014 8:19 AM > > To: [email protected] > > 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 > > _______________________________________________ > > cisco-nsp mailing list [email protected] > > https://puck.nether.net/mailman/listinfo/cisco-nsp > > archive at http://puck.nether.net/pipermail/cisco-nsp/ > > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
