Application scenario
A link becomes unidirectional when only one end of the link can receive packets from the other end.
Unidirectional fiber links occur in the following cases:
Fibers are cross-connected.
A fiber is not connected at one end or one fiber of a fiber pair is broken.
Figure 6 shows a correct fiber connection and two types of unidirectional fiber connections.
When DLDP detects unidirectional links, it can automatically shut down the faulty port to avoid network problems. Alternatively, a user can manually shut down the faulty port.
Figure 6: Correct and incorrect fiber connections
