CBS350 SFP

[krhanger27]

I have a fiber connection between a Cisco SBS350 switch and a Netgear. Everything was working fine for several weeks until I decided to upgrade the Cisco firmware. After the upgrade the fiber port is showing "operationally down". I rolled back the firmware and still no connection. 

[krhanger27]

I should also add that that switch has another fiber connection to an identical Cisco and that one stayed up after the upgrade. 

[balaji.bandi]

have you taken the backup of config, before and after post-upgrade? check on the interface is there config changed?

The only option I can see here is to reset to factory and test it.

[krhanger27]

I did that and still nothing. I power cycled the Netgear and the port briefly came up and then back down. 

[balaji.bandi]

what is the Logs you see on Cisco switch side?

[krhanger27]

It just shows %LINK-I-UP: gi51 and then %LINK-I-DOWN: gi51