I am working on a lab at work before doing some changes on the cisco network.
I have a 3750 and a 2960. They are connected and configured.
When I do a connection between those switch on their Giga interface with a GLC-LH-SM everything works fine. On our network we want to use the GLC-SX-MM but this is KO. I even went to a location on our network where noone works in present time. I took the 1000 BASE-SX off and replace them with the GLC-SX-MM and it was also KO.
I am wondering if there is a problem with compability (but it doesn't look like it based on documentation I have read on the cisco website). I have checked the fiber and the RX, TX and still the same problem.
Based on what I have read, it should work but this is not the case either in lab or on our network (where we have 1000 Base SX).
Thanks for any advices.