Connecting Meraki switches via fiber

[00u1mgm6ipo0vOse75d7]

Hey Guys,

I have set up my Meraki switches in my server room to test my current environment and everything works flawlessly. When I hook up my Meraki switches to my existing environment one works and one doesn't. The only difference I can find is the connection that didn't work is connected via SFP+ uplink ports and the one that did work is connected via SFP uplink ports.

I have a MS350-48p-L3 switch with a MA-SFP-10GB-LR plugged into SFP+ uplink port to a MS125-24P switch MA-SFP-10GB-LR plugged into SFP+ uplink port via 9/125 single mode fiber. (This one didn't work when I connect it to my existing fiber cable)

The one that did work was a MS210-48FP switch with a MA-SFP-10GB-LR plugged into a SFP uplink port to a MS210-48FP switch with a MA-SFP-10GB-LR plugged into a SFP uplink port via 9/124 single mode fiber. 

[Tom Randstrom]

"I have a MS350-48p-L3 switch with a MA-SFP-10GB-LR plugged into SFP+ uplink port to a MS125-24P switch MA-SFP-10GB-LR plugged into SFP+ uplink port via 9/125 single mode fiber. (This one didn't work when I connect it to my existing fiber cable)"

• Have you verified the 2 fibers being used to connect these two switches are functional? 
• Did you look at Show Transceiver Detail for each transceiver to determine if the transmit and receive light levels fall within spec?

[00u1mgm6ipo0vOse75d7]

Yes my network is currently up and running. So the fiber cables are functional. 

The MA-SFP-10GB-LR has a wavelength of 1310nm which is single mode fiber. As stated in my original post that is the type of fiber in my current network.