I have 2 switches running 1GB dark fibre between sites (2 x 6748 switches) working. Currently one switch with SC SMF other with LC MMF
attempting to connect to new replacement 6748 with 720B sup to other site switch running new LC MMF (so both sides will be LC MMF), I'm unable get fibre connection working on standby sup.
port 5/1 is working but not port 6/1. I've swapped over fibre from working 5/1 to 6/1 (standby sup), 6/1 is able to see cdp neighbour and confirm connection 'show ether summ'.
Thought this would be a fibre problem as 5/1 fibre connection works on 6/1 when swapped. I inserted new fibre for Standby sup port directly into DWDM port, light when green on DWDM port, however still no link light on 6/1 or even 5/1 when I tried. Have looped fibre ends, still unable get connection for 2nd fibre.
I would think this would be a fibre problem, however after looping ends this would eliminate this. Would a config problem cause this no link light on the standby sup. see below configs.
NB: No alarms on DWDM
Only difference I can see is ?port-channel per-module load-balance? on new switch
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