Method and system for quickly detecting connectivity of link

Abstract

The invention discloses a method and a system for quickly detecting connectivity of a link. The system comprises a network processor with a memory and a local terminal CPU. Link CFM protection is configured at a local terminal system and an opposite terminal system respectively, and sending and detecting periods of CCM message are set; the local terminal system and the opposite terminal system periodically send the CCM message carried with self MAId and MepId in each sending period respectively, and simultaneously detect the CCM message sent by an opposite terminal; the local terminal system or the opposite terminal system compares the attributes of the CCM message and a local configured remote terminal MEP, and adds 1 to the CCM message count of the opposite terminal if the attributes are consistent, otherwise adds 1 to the error message count; and whether the CCM message count of the opposite terminal exists in each detecting period is detected, the link is disconnected when the CCM message count is 0, and the link is connected when the CCM message count is more than 0. The method and the system need no CPU to participate, and periodically detect the condition of the link by hardware.

Description

Technical field [0001] The present invention relates to the field of network communication, in particular to a method and system for quickly detecting link connectivity. Background technique [0002] The trend of the development of the bearer network to all-IP requires that the IP network must solve the reliability problem. However, in the traditional IP network, fault detection and protection response are all seconds, which cannot meet the basic requirements of carrier-class Ethernet 50ms protection switching. The prerequisite for handover is to be able to quickly detect failures. The currently proposed protocol messages for direct link failure detection include BFD proposed by IETF and eth-oam based on IEEE802.3ah. The Eth-oam protocol interaction process is more complicated and requires CPU participation. The detection time is in the second level, which cannot meet the 50ms switching requirement. The BFD protocol is mainly used for IP routing protection, and its state mechanis...

AI Technical Summary

Problems solved by technology

The interaction process of the Eth-oam protocol is relatively complicated, requiring the participation of the CPU, and the detection time is at the second level, which cannot meet the switching requirement of 50ms

The BFD protocol is mainly used for IP routing protection. Its state mechanism is also implemented through a three-way handshake, which requires the participation of the CPU. BFD packets are UDP packets that require the IP address of the peer end, which cannot be provided in some cases.

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