Assisting a client today who had one of their IDFs go down. Single switch with multi-mode fiber running to this closet. Spent all day swapping SFPs, patch cables, the entire switch eventually. I could not get any link light whatsoever. Decided to try another pair on the fiber, pulled the tray out to figure out which color pair I'd be tracing on the other side. I look at the back and I see 2 dead Latern bugs and 2 of the 6 pairs of fiber chewed off. Luckily I had one available and switched over to it and everything came back up.
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