I'm currently having an issue with establishing a dark fiber circuit between datacenters. The circuit provider has tested the circuit to be good. So, I started my testing on the local end to ensure the hardware (Switch, Switchport, Transceiver) is functioning properly at a basic level before connecting the circuit but ran into an issue. I'm unable to establish an "UP" status on the interface I've installed the 10GBase-LR SFP with a hard loop on the transceiver within my switch. I've tried several ports to verify it's not a switchport issue but same results. I've replaced the 10GBase-LR (Single-Mode) with a 10GBase-SR (Multi-Mode) and the interface works perfectly. The status changes to "UP".
I've added some additional information below. I'm starting think it may be a bad SFP.
Cisco Nexus5548 Chassis
System version: 6.0(2)N2(3)
You may have a bad SFP. The output of the "show interface ethernet 2/6 transceiver details" shows "N/A" for its TX Power. Even if it wasn't connected to anything there should be some sort of transmit output level.
Hope this helps.
@chrihusseyYou are correct. After replacing the SFP, I was then able to hard loop the transceiver and see readings for TX Power.
Thank for your help...