<br />Like I understand udld, it will give me a syslog output or shut down the port depends on the mode (normal(aggressive)
<br />Now I configured it in the lab and "damaged" one of the both fibers. The Link goes down but UDLD was not the reason like i saw.
<br />I'm wrong with my thinking, anyone an idea how i can check the udld in the lab?
<br />tested with 3750 and SFP mulimode.
<br />Best regards
The way you test it is correct. If you disconnect one strand of fiber, it should cause a unidirectional link.
Before you create unidirectional link, can you use "show udld gig 1/0/1" on both sides to see if they have learned the neighbor.