This issue is driving me nuts.... I have even been talking with CCIEs on this and no luck. My next step is to initiate a TAC but was hoping someone on here could help or has seen my issue.
We have 4 brand new 3750G switches and out of the box with no config on them. I plug in the new SFPs (GLC-SX-MM) into ports 49 and 50 and cannot get anything to link with them. I use the same SFPs in ports 51 and 52 and everything links just fine. I tried a loop back test by plugging the fiber cable ends into ports on the same switch and no dice. Of course the loopback works between 51 and 52, but nothing, not even an orange light on 49 and 50.
Anyone seen this?
Fiber cables are 50um MM and I have tried the 62.5 um MM with no success either.