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Method for discovering unit of route calculation

A path calculation unit, a technology of path calculation, applied in the direction of electrical components, digital transmission systems, transmission systems, etc.

Inactive Publication Date: 2007-12-26
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a PCE discovery method, which solves one or more problems caused by broadcasting PCE path computing capability information to the entire network in the existing PCE discovery method

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  • Method for discovering unit of route calculation

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] The core idea of ​​the present invention is: the LSR in the network obtains the path computing capability information of each PCE in the network when it needs to perform path computing, and discovers the PCE according to the obtained path computing capability information, so that only the LSR that has the path computing request, that is, The PCC only performs PCE discovery, which prevents LSRs without calculation requests from also performing PCE discovery, reduces network traffic, and improves the efficiency of PCE discovery.

[0032] The PCE discovery method of the present invention is described in detail below through specific embodiments. The process flow of the method is shown in Figure 1, and specifically includes the following steps:

[0033] Step 10...

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Abstract

The method comprises: when needing to make path calculation, the label switch router (LSR) in network gets the path calculation capacity information of each PCE in network, and according to the obtained path calculation capacity information, finds PCE. In the invention, only LSR having path calculation request can make PCE finding so as to avoid the LSR without path calculation request makes PCE finding.

Description

technical field [0001] The present invention relates to multi-protocol label switching (MPLS) technology, in particular to a path computation element (PCE) discovery method. Background technique [0002] Computing a constraint-based shortest path, that is, constrained path computation is an important part of the MPLS technology and the traffic engineering (TE, Traffic Engineering) of the general multiprotocol label switching (GMPLS) technology. Currently, constrained path computation adopts the mode based on Path Computation Element (PCE, Path Computation Element), that is, when Path Computation Client (PCC, Path Computation Client), such as: Ingress Label Switching Router (Ingress LSR) needs to establish a label switching path (LSP), send a path calculation request to the PCE, and include the destination and constraint information in the request; after receiving the request, the PCE calculates that the request is satisfied according to the topology structure synchronized wi...

Claims

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Application Information

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IPC IPC(8): H04L12/56
CPCH04L45/50H04L45/02H04L45/03
Inventor 张仁海
Owner HUAWEI TECH CO LTD
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