Where I work now I have the same experience you're having now, bad document network, lack of good design and spanning-tree disable in some VLANs. After some investigation, the VLAN1 spanning-tree was disable cause previous administrator have some normal behavior of STP and blocking stuff but he really don't know the way STP works. At the end some ports on edge L2 switchs have a local loop, he solved/patch disabling STP in VLAN1 to avoid the normal behavior. Other rare stuff, etherchannel in auto-auto fashion. If i remember something else I update the thread.
Regards On Thu, Nov 4, 2010 at 11:10 PM, marc abel <[email protected]> wrote: > Hello group, > > Can any of you tell me a reason you would want to disable spanning tree? I > just started at a new company and I am uncovering a number of frightening > design (or lack of design) issues. Someone previously disabled spanning tree > on a number of the main vlans for the core switch. The network isn't well > documented so I don't know the history on why. > > Is there ever a good reason to disable spanning tree? It seems like it must > be a band-aid for some other problem. It frightens me more because the > network has been bridged to basically be one huge broadcast domain. > Thanks in advance, > > Marc > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > >
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