47 RLDP Configuration
47.1 About RLDP
47.1.1 Understanding RLDP
The Rapid Link Detection Protocol (RLDP) is one of D-Link's proprietary link protocol
designed to detect Ethernet link fault quickly.
General Ethernet link detection mechanism only makes use of the status of the physical
connections and detects the connectivity of the link via the auto-negotiation of the physical
layer. This detection mechanism has restrictions and sometimes cannot provide reliable link
detection information for users. For example, if the fiber receiving cable on the optical
interface is misconnected, the related interface of the device is "linkup" physically but
actually the corresponding layer-2 link cannot work for communications due to the existence
of the optical converter. Here is another example. There is an intermediate network between
two Ethernet devices. Due to the existence of the network transmission relay devices, the
same problem may occur if those relay devices are faulty.
The RLDP enables easy detection of Ethernet device link fault, including the one-way link
fault, two-way link fault and loop link fault.
The RLDP implements the detection by exchanging the RLDP packets at the two ends of the
link, as shown below:
Figure 47-1
The RLDP defines two protocol packets: Probe packet and Echo packet. The RLDP sends
the Probe packet of this port to the port with RLDP configured and in linkup status on regular
basis, and waits for the Echo packet from the neighbor port and waits for the Probe packet
sent by the neighbor ports. If a link is correct both physically and logically, a port shall be
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