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I have a network based on 3com switches, with a switch 5500G in the core and switch 4500 and 4400 on the edge. I have some problems with stability in the network and I have started to dig into spanning tree-related issues. When I view the STP-statistics on the coreswitch I can see that the topology in the network changes quite often (by using the &quot;display stp&quot;-command), even if I have not changed anything in the network. No switches are shut down and no swithes are added. It seems the the switch logs a topology change many times every dag, in fact several times per hour. My question is: How can I determine what is causing to topology change? Probably a link on a switch in the network is flapping up and down and causing the event, but how to find it? Any tips?
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I have a network based on 3com switches, with a switch 5500G in the core and switch 4500 and 4400 on the edge. I have some problems with stability in the network and I have started to dig into spanning tree-related issues. When I view the STP-statistics on the coreswitch I can see that the topology in the network changes quite often (by using the "display stp"-command), even if I have not changed anything in the network. No switches are shut down and no swithes are added. It seems the the switch logs a topology change many times every dag, in fact several times per hour. My question is: How can I determine what is causing to topology change? Probably a link on a switch in the network is flapping up and down and causing the event, but how to find it? Any tips?

How to find which switch that is causing a topology change

Networking hardware includes the physical devices facilitating the use of a computer network. Typically, networking hardware includes gateways, routers, network bridges, modems, wireless access points, networking cables, line drivers, switches, hubs, and repeaters. But it also includes hybrid network devices such as multilayer switches, protocol converters, bridge routers, proxy servers, firewalls, network address translators, multiplexers, network interface controllers, wireless network interface controllers, ISDN terminal adapters and other related hardware.

Networking Hardware-Other

Network Operations includes asset management, help-desk supervision, security and user policies, infrastructure administration and anything else that affects the operation of your network. Discussions will include those of best practices in platforms, configurations, performance, security and accounting.