Data Cable looped back, Took down Network.. Need help Preventing
Posted on 2013-02-01
Please forgive me for any networking ignorance below. I'm not well versed in STP and other Switch Security Features.
Today we had a user plug their Data Network Cable coming from the wall into their Voice Network jack (also coming from the wall). Because the PVID on the Voice Network is the same as the Data Network (Mulit-purpose Jacks for Computers and phones) It caused a portion of the network to crash until the loopback was found.
The Trouble is that it was looped between 2 Separate switches from 2 different manufactures. How can I prevent things like this from happening in the future?
Typically in a loopback situation I check ports for errors. In this situation, every port showed no Errors. We finally went desk to desk and found the problem. It felt like it was a loopback issue even though no port errors were showing up.
I know there are STP and BPDU settings that are supposed to help with this but I'm not sure how to correctly set my devices.
It would have been great if one of the switches could have detected the problem and disabled or Flagged the port.
The two switches in question are:
HP (3com) Baseline Switch 2952
How do I prevent this from happening in the future?
Thanks in advance.