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DES-7200 Configuration Guide Chapter 7 RLDP Configuration
7-1
7 RLDP Configuration
7.1 RLDP Overview
7.1.1 Understanding RLDP
The Rapid Link Detection Protocol (RLDP) is one of DES-7200'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
the user. For example, if the optical fiber receiving line pair on the optical
interface is misconnected, due to the existence of the optical converter, the
related port of the device is "linkup" physically but actually the corresponding
layer-2 link cannot work for communications. 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 messages at the
two ends of the link, as shown in Figure-1:
Figure-1:
The RLDP defines two protocol messages: Probe message and Echo message.
The RLDP sends the Probe message of this port to the port with RLDP