Label switch path selection method based on link bundle

Abstract

The invention discloses a label switch path selection method based on link bundle. The method comprises the following steps: a route computation and wavelength allocation entity determines one or more of bunding links and unbunding links passed by LSP; the entity selects member link form each bunding link according to a first intended strategy; and the entity determines the wavelengths for communication of each member link and unbunding link in LSP according to a second intended strategy, wherein the same member link is selected in the upstream direction and the downstream direction for each bunding link, and the same wavelength is selected in the upstream direction and the downstream direction for each selected member link and unbunding link. By using the technical scheme of the invention, the demands of simplifying network management of the operators can be satisfied and the operation cost of the operators is effectively reduced.

Description

technical field [0001] The present invention relates to the field of communication, in particular to a label switching path selection method based on link bundling. Background technique [0002] In a wavelength-switched optical network, there may be multiple links between a pair of nodes. Based on the routing scalability requirements, it may be necessary to use the multiple links as an independent traffic engineering (Traffic Engineering, TE for short) chain The route is flooded into an Open Shortest Path First (Open Shortest Path First, OSPF for short) or an intermediate system to intermediate system routing protocol (Intermediate System to Intermediate System Routing Protocol, IS-IS for short). Moreover, in the standard RFC4201 of the Internet Engineering Task Force (IETF for short), the corresponding implementation mechanism is described and the concept of a bundled link is introduced. When the link bundling technology is used, , the traffic parameter information related...

AI Technical Summary

Problems solved by technology

In order to solve this problem, under the Routing with Distributed WA distributed wavelength allocation architecture of the draft draft-bernstein-ccamp-wavelength-switched, the draft draft-bernstein-ccamp-wson-signaling provides a signaling solution. However, this solution lacks a solution that combines wavelength selection and member link selection after using link bundling technology.

[0010] At present, although it is possible to select the same member link strategy for the upstream and downstream directions of a bidirectional LSP as the default behavior of each node in the network, in a network composed of nodes from different equipment manufacturers, each manufacturer implements The selection strategies of node member links may be different. In a distributed environment, it is impossible for the equipment of various manufacturers in the operator's network to communicate with each other, which will increase the cost of the operator's network operation and maintenance.

[0011] Moreover, for existing bundled links, in certain cases, the operator needs to unbundle these bundled links (split the bundled link into multiple unbundled links), if some LSP These bundled links to be unbound have been used. Since the signaling state of the connection is maintained on the bundled link after the connection is established, in a distributed environment, the signaling state of the LSP is Unable to perform maintenance on two different links

[0012] In addition, in the WSON network, there is often limited wavelength conversion. With the control plane, the intelligence of the network is greatly improved. In the absence of human intervention, end-to-end services can be intelligently selected through software routing. At present, The LSP is mainly established through distributed signaling, but this will cause the wavelengths used on the links that the LSP passes through to be different. If there are a large number of such LSPs in the WSON network, the subsequent maintenance costs of the entire WSON network will become very high. High, not conducive to operators to simplify network management

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