Failure detection and link recovery method based on bidirectional forward link

A two-way forwarding detection and two-way forwarding technology, which is applied in the field of IP network communication, can solve problems such as inability to quickly detect and recover faults, and achieve the effects of solving frequent link oscillations, ensuring stability, and improving reliability

Active Publication Date: 2008-04-30
ZTE CORP
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Problems solved by technology

[0019] The purpose of the present invention is to propose a method for fault detection and link recovery based on bidirectional forwarding links, s

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  • Failure detection and link recovery method based on bidirectional forward link
  • Failure detection and link recovery method based on bidirectional forward link

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[0052] The core idea of ​​the present invention is based on BFD link detection, using policy routing configuration to initiate two-way BFD failure detection and fast recovery of the failed link, and to provide a fast detection method for whether the next hop of the policy routing configured by the user is valid. The BFD detection notification mechanism makes the detection at the forwarding level more efficient; through the combination of BFD technology and IP FRR (IP Fast Rerouting) technology, when BFD detects that the next hop of the policy routing BFD session is down, it passes IP at the forwarding level FRR technology realizes millisecond-level forwarding next-hop switching, so that the failed link can be restored in the shortest time, while still performing BFD detection on the DOWN link. Once the link is detected, the forwarding plane will switch back to the original master. On the link. The BFD detection in the present invention is a BFD detection and recovery function that...

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Abstract

The invention discloses a fault detection and link restore method which is based on a two-way forwarding link, including the following the steps of: configuring the linkage of the next hop of a strategy router and the BFD conversation; configuring the BFD detection parameters under the interfaces of routing equipment; establishing a BFD conversation: carrying out the consultation of BFD detection parameters between two parties after the up of the BFD conversation: generating the IP FRR main standby router; carrying out the BFD detection on a forwarding layer; being down for the forwarding layer after the detection of link overtime; carrying out the IP FRR switch the forwarding layer according to the strategy router configuration, so as to switch to a backup router and notice the application layer of the strategy router. The invention provides the fast and high efficient fault detection and restore method of the next hop of the forwarding layer, which can improve the reliability of the forwarding in the actual network environment, effectively solve the link frequent vibration which is caused by link fast switch, ensure the stability of the link and enrich the application of BFD protocol in the network detection simultaneously.

Description

technical field [0001] The invention relates to the technical field of IP network communication, in particular to a method for fault detection and link recovery based on bidirectional forwarding links. Background technique [0002] With the development of network communication technology, in order to ensure the quality of data transmission, the requirements for network equipment are getting higher and higher. It is required that communication failures between adjacent systems can be quickly detected, so that when a failure occurs, a backup link can be established faster link or switch to other links. But there is a lot of hardware and software that cannot provide such functionality. At present, the commonly used network detection method is implemented by using the Hello (handshake) mechanism, especially in routing protocols, but the detection time generally exceeds 1 second. [0003] In order to quickly discover and switch to other links when a fault occurs, the BFD (Bidir...

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Application Information

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IPC IPC(8): H04L12/26H04L29/06
Inventor 张丽晖韦红波赵建风
Owner ZTE CORP
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