If two devices, A and B, are connected via a pair of optical fibers, one used for sending from A to B and other for sending from B to A, the link is bidirectional (two-way). If one of these fibres is broken, the link has become one-way or unidirectional. The goal of the UDLD protocol is to detect a broken bidirectional link
This is a very helpful protocol to protect the network from loops. It helped me on at least one occasion where a wan fiber turned out to be unidirectional.
I am sorry to have reacted somewhat prematurely. You know, it happens sometime that people here give great answers, often much better than in expensive textbooks, but the person who originally asked never comes back again. Riccardo deserves all the credit and I am sure he did not mean his post maliciously. Of course I accept your reasons and apologize for my own comment if it was inppropriate.
Thank you for coming back and letting us know, and huge thanks goes also to Riccardo for his tireless help on CSC!
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