Method for monitoring link packet loss and bidirectional forwarding detector

Abstract

The embodiment of the invention discloses a method for monitoring link packet loss and a bidirectional forwarding detector. The method comprises the following steps: when the bidirectional forwarding detection (BFD) session state is UP, counting the number of the actually received BFD messages which are sent periodically in a detection period; calculating the link packet loss ratio in the detection period according to the counted number of the BFD messages; and if the link packet loss ratio in the detection period is larger than a configured alarm threshold, reporting a link packet loss faultalarm so as to detect link packet loss faults so that an upper-layer application terminates links with bad quality in time and then the link communication quality can be improved.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a link packet loss monitoring method and bidirectional forwarding detection (BFD, Bidirectional Forwarding Detection) equipment. Background technique [0002] Link fault fast detection technology is playing an increasingly important role in network applications. Through this technology, the system can quickly find out the fault after the link fault and take countermeasures. But not all transmission media have the function of fast detection of faults. For example, Ethernet does not have this function. It needs to use the "Hello" mechanism (usually used in routing protocols) to assist detection, and it takes at least 1 second after the link fault The clock can detect it. Such a long failure time on a high-speed link will cause a large amount of data loss, so a faster and independent routing protocol detection mechanism needs to be introduced, and the BFD protocol can meet t...

AI Technical Summary

Problems solved by technology

[0011] During the research and practice of the prior art, the inventors of the present invention found that in the prior art, in the link detection process, it is assumed that the link packet loss phenomenon is relatively serious, and the packet loss rate is as high as 50%, but due to the Packets are likely to occur evenly, and 10 packets may not be lost in a row, so BFD may not be able to detect this kind of failure

Therefore, BFD can only detect link continuity, but is not sensitive to link packet loss. In some cases, link packet loss may be serious, but BFD cannot detect link faults, and the link continues to If it remains available, it will cause problems with the services it carries, such as poor call quality, slow data transmission, etc.

Images