I have a Cisco 3750 Switch that has trunk connections to 4 other 3550's. Out of the 4 trunks, 3 of them are flapping. Every couple of minutes, I see the 3 links go down and come back up. As a result, users are complaining about network slowness and disconnects.
Other than it being a physical cabling problem, what else could cause such an issue? I cleared all the counters on the interfaces that are having the issue, and since then, I see input errors on two of them and no errors on one of them.
All the trunk ports are fiber GigE ports. The 3750 stack has two units in it.
Surprisingly I don't see any of the 3550's log the flapping messages. I have enabled logging at the debugging level, but I don't see the 3550's complain about anything. Howcome it's only the 3750 complaining about the flapping??
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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