Just a quick question as i'm troubleshooting an issue for one of my clients. They have a mixed network of 3com switches and cat express 500's. They also have a 3com phone system. We did not sell nor implement any of the 3com solution and they are having problems where their phones (which are strictly L2 phones, according to the vendor/reseller) will lose ability to dial out. It happens weekly and only affects certain phones.
The vendor/reseller wants us to disable STP on the Cat500's as he feels that it is causing the issue. I would rather not do that as i would feel it is compromising the redundancy of the network and is not a permanent solution. The main question I had that I can't seem to find the answer to is if anything beyond a new switch being installed and sending and receiving BPDU's would cause STP to reconverge.
My question stems from the vendor/reseller saying that anyone who plugs in ANYTHING to the network (be it 4-port hub, wireless AP, or PC/laptop) will cause STP to reconverge and can cause packets (from the phones) to be dropped as ports transition.
I think he's crazy...how about you guys?