This was most definitely a topology change. Happened when this outage occured.
________________________________ From: Pete Templin <[email protected]> To: Michael Sprouffske <[email protected]> Cc: "[email protected]" <[email protected]> Sent: Tuesday, June 4, 2013 4:24 PM Subject: Re: [c-nsp] Possible spanning tree issue On 6/4/13 3:56 PM, Michael Sprouffske wrote: > I attached a new switch to the network and it took down our contact > center that doesn't touch this switch nor does the phone system. Is > this spanning tree doing this? I don't see anything in the logs that > show a change in spanning tree. > > I also had an employee unplug a switch by accident and it took down > our contact center. This switch is all by itself and does not > directly touch the phone system nor is it in the path of the phone > system. I feel like this shouldn't have happened. You won't see anything in the logs regarding STP changes unless you're running a debug before/during/after and you are logging at the debug level. Do "sh spann det | inc gy changes" on a switch and see if one or more VLANs had a topology change about the time this event happened. If it's more recent than that, the commands after the next paragraph may become quite important. At this very moment, I would highly suggest that you stop whatever else you're doing and embark on a priority-1 project to assess and define your STP root placement. I suspect, reading between the lines of your post, that you haven't done much to select where it is, and you're experiencing a change in root placement. I'd strongly suggest assessing whether any of the following make sense in your environment: Global: spanning-tree vlan 1-4094 pri 8192 spanning-tree portfast default spanning-tree portfast bpdufilter default Interface: no spanning-tree portfast spanning-tree portfast trunk spanning-tree bpduguard enable spanning-tree guard root pt _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
