I have a fibre link that passes all of the generic fibre tests, icluding the 1000baseLX and SX tests. However when I connect switches to the link I only get a LINK LED on one side.
Here are the test I did.
I connected a cisco 2950 switch in Location A to the Nortel in location B. The Nortel would get a link light but the cisco would not.
When I connect a nortel switch in location A to a linksys in location B, the linksys gets a link light, but the nortel does not.
When I connect the 2950 in location A to the linksys location B, neither gets a link light. The linksys link light will flash the instant the fibre is inserted, but goes back off immediately and stays off.
I then got a media converter and added to the equation
The MC would get a link light when connected to the nortel, but the nortel, would not get a link light.
When the MC is connected to the cisco neither gets a light
When the MC is connected to the linksys, the MC gets a light but the lilnksys does not.
Under what circumstances would you get a link light on one side of a fibre link and not the other.
In my experience, the one time that happened to me, it was because there was a problem in one strand of the fiber. So one switch could send but the other could not. The explanation given to me was that a switch only needs to see traffic sent from the other for the link light to come on.
So if switch A can send to B but B cannot send to A, you will get a link light on B but not on A.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...