Tried asking this question earlier and got downvoted to oblivion so I guess I’ll rephrase and try again. We’re experiencing multiple simultaneous link failures on ethernet links that are physically in proximity to each other but in no way connected to each other. These are separate, basically air-gapped networks, that share the same rack, but we are experiencing the same symptom across all networks. Haven’t checked the links with a cable certifier but my Fluke microscanner says the links are physically good and within length limits. Cable infrastructure is about 2 years old and we haven’t had any issues until recently. We tried swapping out the equipment on either end of the link and the links stay down. Even tried just plugging in a pair of known-good laptops on either end of the cable and the laptops don’t detect that a cable is plugged in. What I can’t figure out is that all the cable testers I have access to say the links are good.
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