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which interface to loop errdisable?

When a loop happens, which interface gets disabled? From my observation it looks like 3750 disables all trunk ports involved in the loop but leave the access ports alone, which does resolve the issue. Is this a deterministic behavior?

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which interface gets disabled?

The ports where the loops are detected. I'd assume you are talking about etherchannels / portchannels

Is this a deterministic behavior?

Yes, access ports (edge ports) typically carry one or two mac addresses of end-points. Not from another switch.

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