While I was moving servers and switches to new IT room, i lost the fibre link between old and new building. So I connected a backup fibre between other two backup switches and connected to the original switch by cat 5 cable, the network started running fine, but refuses to start with original fibre link. When i looked the switch interface, fibre port status is down and i can see small red light coming from the SFP port. Is there anyway to troubleshoot this problem without using additional SFP or fibre testing tools? Many Thanks.
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