I've encountered into a strange issue with a fiber run. I was seeing CRC receive errors on one side, so I scheduled in downtime and swapped patch leads/cleaned/etc - The fiber never came back up. It was running on 10G SFPs, the only compatible spares I had were 1G so I swapped at both ends and it came up straight away. Zero CRC errors too.
With limited spares I'm pretty certain the issue is a faulty SFP and have a replacement on the way, however my question is; Is it possible that there's a small amount of fiber damage (attenuation, whatever) that is enough to stop 10G working, but not enough to stop 1G working?
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