Fast rerouting method and node

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...

AI Technical Summary

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 software packet detection method also has the following defects:

[0018] For the protection of intermediate nodes, the software packet detection method is only applicable to the network structure with one node in the middle, that is to say, only one intermediate node can be protected. When there are multiple nodes in the middle, the software packet detection is powerless and cannot be effectively protected.

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