We have a simple 2 office location network. This was previuosly connected via kilostream connection. This has now been replaced by an MPLS connection using Cisco routers.
When we connect the MPLS to the network of the main office location, the network grinds to a halt due to a loop. We have identified that the Spanning Tree Protocol from the cisco router as the cause. We have switched this protocol off and everything works fine.
Unfortunately the company providing the MPLS will not support the connection unless this protocol is switched on. They say the fault is with our network and we have reached stalemate.
Can someone please suggest any tools or services we could try to identify the problem?
Best Answer
How have you identified that STP on the router is the culprit? If you take the output of a "show STP" on each of your routers/switches, you should be able to see where the spanning tree's root is.
Running a packet trace with Wireshark or something similar would show the broadcast storm in progress, if that's what's happening, and hopefully point you in the direction of the box responsible.