I have replaced old Cisco 1900 switches with 3850's in my plant process areas.
Added Fiber links between 3850's for increased performance. I can't get data transfer through the fiber uplinks.
I have assigned some of the LAN ports to the different VLANS and they are communicating correctly.
The Gib Fiber ports when assigned to the VLAN do not pass data.
As a "Band-Aid" I installed Fiber media convertors to connect the fiber backbone to the VLANs. Data does pass through the convertors to the VLAN ports.
Not sure what I'm missing as why the fiber ports aren't passing data as the LAN ports are.
Gone through several Cisco manuals and checked multiple options with no success.
My process is operational so I am now limited in my access to the switches until the next shutdown.
Any suggestions would be appreciated.
Best Answer
Make sure the module is recognized by the switch.
Issue: show inventory
Stack1#sh inv
NAME: "Switch 1 FRU Uplink Module 1", DESCR: "2x1G 2x10G Uplink Module" PID: C3850-NM-2-10G , VID: V01 , SN: XXX
NAME: "Te2/1/1", DESCR: "SFP-10GBase-SR" PID: SFP-10G-SR , VID: V03 , SN: XXX
If the Uplink module is not recognized, contact your sales rep. By the way, yours may vary slightly. The second named item is the GBIC.