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DES-7200 Configuration Guide Chapter 7 RLDP Configuration
7-3
The so-called one-way link detection means the link connected with the port can
receive message only or send messages only (due to misconnection of the
optical receiving line pair, for example). As shown above, the RLDP only
receives the detection message from the neighbor port on a port, so it is
considered one-way link fault. So, the RLDP deals with the fault accordingly
according to the user configurations. In addition, if the port cannot receive any
RLDP detection message, it is also considered one-way link fault.
Two-way link detection:
Figure-4：Two-way link detection
This means that fault occurs at the frame transmission/receiving at both ends of
the link. As shown above, the port of the device sends the RLDP probe
message but has never received the Echo message or the Probe message from