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Link detection method, device and system

A link detection and link technology, applied in the field of IP network communication, can solve problems such as inaccurate link connectivity status detection

Inactive Publication Date: 2010-08-11
ZTE CORP
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  • Abstract
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Problems solved by technology

[0010] The present invention provides a link detection method, device and system, which solves the problem of inaccurate detection of link connection status between nodes

Method used

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  • Link detection method, device and system
  • Link detection method, device and system

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Embodiment Construction

[0041] For multi-hop BFD sessions, especially for connectivity detection between non-adjacent nodes, if a multi-hop BFD session is established between two nodes, if the active and standby links have been switched before BFD detects the link, if the Update the sending and detection path of BFD. If BFD still detects the main link, it will report Down to the upper layer. However, at this time, the two nodes may still be reachable, and it cannot accurately reflect the current link between the two nodes. connected state. In addition, when the forwarding path changes due to route or label flapping, if the sending path of BFD packets remains unchanged, it will also cause false positives of the connection status of the links between nodes.

[0042] In addition, the sending and detection of BFD packets are generally implemented by micro-engines (such as node CPUs). The performance of the micro-engine is limited, and as a forwarding chip, it has to handle very complicated work. BFD pa...

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Abstract

The invention provides a link detection method, a link detection device and a link detection system, relates to the field of IP network communication and solves the problem of inaccurate detection of a link communication state between nodes. The method comprises the following steps: if a link path changes, updating link path information; and transmitting and receiving a bidirectional forwarding detection message according to the updated link path information. The technical scheme provided by the invention is suitable to be used in a bidirectional forwarding protocol network.

Description

technical field [0001] The invention relates to the field of IP network communication, in particular to a method and device for realizing multi-hop BFD fast detection and switching protection. Background technique [0002] With the development of network communication technology, network equipment needs to quickly detect communication failures between adjacent systems, so that alternative channels can be established faster or switched to other links when a failure occurs. [0003] The emergence of the BFD (Bidirectional Forwarding Detection, Bidirectional Forwarding Detection) protocol provides a solution to the above problems. [0004] The main goal of BFD is to provide a low-load, fast method for detecting failures between two adjacent nodes, which can detect interface failures, data link disconnections, and even failures of the nodes themselves; in addition, BFD is also a A single detection mechanism that can be applied to any medium or any protocol layer. [0005] Usua...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/26H04L12/24H04L45/24H04L45/28
CPCH04L43/0811H04L41/12H04L45/22H04L45/28
Inventor 李爱民
Owner ZTE CORP
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