Fiber to the living room is now going to my Mellanox switch, I found the problem!
Apparently I used these odd 850nm/550M SFPs when I ran this originally? I didn't know that I could do 850nm over OS2 fiber, but apparently it's doable as the link was working with them in place..!
Now with a proper 1310nm SFP in the living room switch it's all up and working.






