Method, system and device for ensuring BFD conversation stability on the scene of multilink direct connection

Abstract

The invention discloses a method for ensuring BFD conversation on the scene of multilink direct connection, which is applied in a system comprising a transmitting end device and a receiving end device, wherein the transmitting end device and the receiving end device are communicated by at least two directly-connected chains. The method comprises the following steps: the transmitting end device transmits BFD protocol messages with the same sequence number to the receiving end device respectively through at least two directly-connected chains, wherein each BFD protocol message carries the sequence number, and the sequence numbers are increased progressively after each message is transmitted in the current conversation; and the sequence number of the BFD protocol messages is detected after the receiving end device receives the BFD protocol messages, the first message with the same sequence number is processed, and the follow-up messages with the same sequence number are discarded. The invention can realize the stability of the BFD conversation and the upper application protocol when a part of ports or chains go wrong on the scene of multilink direct connection, thus ensuring the stable operation of traffic flow.

Description

technical field [0001] The present invention relates to the field of communication technologies, and in particular to a method, system and device for ensuring BFD session stability in a multi-link direct connection scenario. Background technique [0002] In order to reduce the impact of equipment failures on services and improve network availability, equipment needs to be able to detect communication failures with adjacent equipment as soon as possible, and establish a backup channel to restore communication, thereby ensuring business continuity. [0003] BFD (Bidirectional Forwarding Detection, bidirectional forwarding detection) is a unified detection mechanism for the entire network, providing a general, standardized, medium-independent, protocol-independent fast fault detection mechanism for fast detection and monitoring of links in the network Or the forwarding connectivity status of IP routing. BFD can uniformly and quickly detect failures of bidirectional forwarding ...

AI Technical Summary

Problems solved by technology

[0019] In the existing solution, when the port sending the BFD protocol packet is faulty, because the speed of aggregation switching (or equivalent routing switching) itself is relatively slow (>50 ms), and BFD can provide millisecond-level detection at the fastest, it will BFD detects a fault by mistake, causing unnecessary switchover of the upper layer protocol

Therefore, when there is a multi-link direct connection between RouterA and RouterB, it is required to set the interval between BFD protocol packets to be long enough. For example, for multi-port aggregation, it is required to be set to more than 100ms; Therefore, when the forwarding engine of RouterA or RouterB fails, BFD has to wait for more than 100ms or more than 500ms to detect the failure, prolonging the time for fault detection and network convergence

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