I recently got a problem with my FSO connection that is interconnecting two switches (Catalyst 4506 running IOS and Catalyst 6509 running CatOS). It has been running fine for the last three weeks but suddenly stopped working yesterday.
This is the weirdest part of the problem, there is link light on the 6509 (coming from the FSO) and there is no link light on the 4506 (coming from the FSO).
However, when I monitor the FSO unit, it says that they are communicating and I assume so because when I do a "shutdown" on the port on the 4506, the port on the 6509 says "Port 2/6 has become non-trunk". When I do a "no shutdown" on the 4506, the 6509 says "Port 2/6 has become a trunk" as if it has come alive because I re-enabled the port.
Any suggestions? Thank you for your help ahead of time.