I've got a bit of a head scratcher on my hands. We have a portable equipment rack with a few network devices in it. Each device connects directly to a corresponding device, which are each located in other racks, so there's 6 racks about 100 feet apart and about a dozen device-to-device "crossover" connections between devices in different racks. There is no connectivity within the racks between devices. The only network connections are the device-to-device connections running between racks. We've never had any issues with this setup until yesterday, when not a single network connection would come up. No link lights, nothing. A dozen simultaneous failures, with no single point of failure. They aren't running the same OS, so we can rule out driver issues. I'm having trouble coming up with an explanation for how this could have happened. The only theory I have is that it could be power-related, maybe a ground loop? We set it up again today and it's all working again.
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