Point-to-point link fault detection method

Abstract

The invention discloses a point-to-point link fault detection method. The method comprises the following steps: (1) configuring loopbacks on to-be-tested links in sequence; (2) sending a test message through a link diagnosis command under a router interface, and checking a test result; (3) and removing the configuration of the loopbacks on the links. In the case of a point-to-point link fault, the point-to-point link fault detection method disclosed by the invention can be directly applied to the link fault diagnosis of the router interface, comprising a POS interface, an E1 interface, a CE1 interface and a CPOS interface, the point-to-point link fault detection method disclosed by the invention is irrespective to the specific protocol package type on the interface, and UP of a link layer protocol is not required neither, besides the detection of connectivity, the method can also be applied to the detection of link delay, and the precision can reach a microsecond level.

Description

technical field [0001] The invention belongs to the field of data communication and relates to a fault detection method of a point-to-point link. Background technique [0002] The point-to-point link of the WAN includes POS, E1, CE1, CPOS and other interface types. Because it is a long-distance transmission, a series of transmission equipment is needed in the middle, which is relatively easy to break down, and it is difficult to troubleshoot. Big. Therefore, it is very necessary to provide a simple and convenient positioning and detection method. [0003] The transmission network of the existing wide area network is mainly transmitted through the SDH (Synchronous Optical Hierarchy, Synchronous Digital System) network. Because it is a synchronous signal, it can realize the multiplexing of multiple signals very flexibly, and can access from 2M, 155M, 622M , 2.5G and other speed signals. On a point-to-point link, the PPP (Point-to-Point) protocol is generally run first, and ...

AI Technical Summary

Problems solved by technology

This requires that the PPP protocol can correctly receive the loopback protocol message, which may not meet the requirements when the link quality is very poor and the received message is wrong.

Secondly, the interface needs to encapsulate the PPP protocol, which cannot support other protocols; cannot view the content of error packets; and the delay accuracy of ping is very poor, which is limited by the accuracy of CPU process scheduling, and can only reach the millisecond level at most.

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