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Dual-end recursive path computation element (PCE)-based computation method and device

A path calculation and path calculation request technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as vulnerability to security threats, increased blocking rate, and long time-consuming, so as to improve business performance and reduce time consuming, significant effect

Inactive Publication Date: 2011-09-21
ZTE CORP
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Problems solved by technology

[0011] In view of this, the main purpose of the present invention is to provide a DRPC method and device to solve the problems of resource conflict, increased blocking rate, and vulnerability to security threats caused by the path calculation process taking too long in the prior art

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  • Dual-end recursive path computation element (PCE)-based computation method and device

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Embodiment Construction

[0046] The DRPC method of the present invention is suitable for MPLS and GMPLS networks, referring to figure 2 As shown, it mainly includes the following steps:

[0047] Step 101: The parent PCE sends a path calculation request from the source node to the destination node to the source domain PCE and the destination domain PCE according to the determined PCE sequence participating in the path calculation;

[0048] Step 102: The source domain PCE initiates path calculation from the source node to the entry boundary node of the intermediate domain according to the path calculation request; the destination domain PCE initiates the destination node to the next domain entry boundary node of the intermediate domain according to the path calculation request Path calculation of nodes;

[0049] Step 103: According to the path calculation result initiated by the source domain PCE and the destination domain PCE initiated path calculation result, the intermediate domain PCE obtains the ...

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Abstract

The invention discloses a dual-end recursive path computation element (PCE)-based computation method. In the method, path computation is initiated at the same time at a source domain PCE and a destination domain PCE, and an intermediate domain PCE obtains the shortest path from a source node and a destination node by a result obtained by dual-end path computation. The invention also discloses a dual-end recursive PCE-based computation device. By the method and the device, time required by end-to-end path computation can be shortened maximally, thereby improving the performance of services transmitted by a network and simultaneously reducing security threats to the path computation. Particularly, more remarkable effects can be achieved in large-scale multi-domain multi-protocol label switching (MPLS) and generalized MPLS (GMPLS) networks.

Description

technical field [0001] The present invention relates to multi-protocol label switching and path calculation of a general multi-protocol label switching network, in particular to a dual-end recursive path calculation (DRPC, Dual-end Recursive PCE-based Computation) method and device. Background technique [0002] With the large-scale development of multi-protocol label switching (MPLS, Multi-protocol Label Switching) and general multi-protocol label switching (GMPLS, Generalized MPLS) networks, the network topology is becoming more and more complex, and the amount of routing is very large, while traffic engineering Deployment requires network devices to calculate routes under complex constraints. These constraints include not only static constraints, such as the distance between router nodes, bandwidth, and line capacity of optical network equipment, but also dynamic constraints, such as network Fault status, network congestion information, etc. Constraint-based path calcula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L45/50
Inventor 付锡华鲍远林张杰赵永利
Owner ZTE CORP
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