Does following scenario work? We have single mode fiber running between two building, but we have MMF patchcord connected to SPF (SFP-10GBase-SR).
[SPF]---MMF----[=======SMF======]----MMF---[SPF]
I am seeing my interface is flapping but just wanted to make sure it whether it because of mixing fiber mode or something else.
Best Answer
Yes, this absolutely is a problem. Don't ever mix different types of cabling. Multimode has a 50 or 62.5 micron core diameter, while single mode fiber typically has a 9 micron core. If you connect two fibers with different core diameters, you'll lose a lot of the light going through the connector, resulting in a link flapping or being down.