Ruijie RG-S2900G-E Series, Configuration Manual

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Configuration Guide RLDP Configuration
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 the neighbors. So, it is considered two-way link
fault. From the nature of the fault, the two-way fault actually includes the one-way fault.