Fast rerouting method and node

A fast and routing technology, applied in the direction of digital transmission system, electrical components, transmission system, etc., can solve the problems of difficulty in further performance improvement, ineffective protection, increase in hardware cost, etc., to achieve a wide range of applications, avoid increase, and improve switching speed effect

Inactive Publication Date: 2009-02-18
NEW H3C TECH CO LTD
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Problems solved by technology

However, this method of using multi-core CPU or multi-CPU will undoubtedly greatly increase the hardware cost, and even if the hardware is added, it can generally only reach the order of 50ms, and the performance is difficult to further improve
[0014] In addition to the above-mentioned shortcomings such as slow switching speed and high hardware cost, the existing fast rerouting method implemented by sof

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  • Fast rerouting method and node
  • Fast rerouting method and node
  • Fast rerouting method and node

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[0043] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0044] According to statistics, in actual network applications, port link down (failure) accounts for the vast majority of all link failures. For port down, through special configuration of the hardware interrupt control register, the physical hardware can generate fast interrupts. Combined with software for analysis and filtering, real-time interrupts can be obtained. In view of this feature, the present invention proposes a hardware detection scheme, the basic idea of ​​which is to use port down interrupts generated by physical hardware to make real-time and accurate judgments on the link status, so as to be able to handle link failures in time and achieve rapid rerouting.

[0045] image 3 Shows a flow chart of the fast rerouting method in the ...

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Abstract

The invention discloses a quick heavy-route method and node. The method comprises following steps: A, node receives port down interruption or topotactic transformation information, then judges if fault port lies in main label exchange path LSP, if so, then performs B; B, judges if present node is header node, if so, then performs quick heavy-route switching and switches service traffic flow from main LSP to protected LSP, or, sends port down topotactic transformation information to other direct connection node main LSP can reaches, the other direct connection node performs step A after receiving port down topotactic transformation information. The invention can promote quick heavy-route switching speed without increasing hardware cost, guarantees network stability and is not limited by middle node number.

Description

technical field [0001] The invention relates to the routing technology in the communication network, in particular to a fast rerouting (FRR, Fast ReRoute) method and node. Background technique [0002] Fast rerouting is a mechanism used in MultiProtocol Label Switching Traffic Engineering (MPLS TE, MultiProtocol LabelSwitching Traffic Engineering) to achieve link protection and node protection. The basic principle is to establish a backup label switching path (LSP, Label Switched Path) in advance. to protect one or more LSPs. Wherein, the pre-established backup LSP is called the protection LSP, and the protected LSP is called the main LSP. When the main LSP link or node fails, the device that detects the failure quickly switches the service from the failed main LSP to the protection LSP, and uses the protection LSP to bypass the failed link or node to reduce data traffic loss. [0003] Generally, MPLS TE fast rerouting is divided into two types according to different prote...

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Application Information

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IPC IPC(8): H04L12/56H04L12/24H04L45/28
Inventor 李华舟
Owner NEW H3C TECH CO LTD
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