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Computing method and system for multi-domain two-way label switched path

A label switching path and calculation method technology, applied in transmission systems, digital transmission systems, data switching networks, etc., can solve the problems of inability to notify the attribute information of reverse inter-domain links and inability to calculate multi-domain bidirectional LSPs, etc.

Inactive Publication Date: 2015-01-28
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a bidirectional end-to-end LSP, the attribute information of the reverse inter-domain links (A1←B1 and A2←B2) still cannot be advertised to PCE(i), resulting in the inability to calculate multi-domain bidirectional LSP

Method used

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  • Computing method and system for multi-domain two-way label switched path
  • Computing method and system for multi-domain two-way label switched path
  • Computing method and system for multi-domain two-way label switched path

Examples

Experimental program
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Embodiment 1

[0096] Figure 7 It is a schematic diagram of the principle of Embodiment 1 of the method for calculating a multi-domain bidirectional label-switched path in the present invention. Figure 7 As shown, there are three ASs, that is, AS1, AS2, and AS3, and there are three PCEs, that is, PCE1, PCE2, and PCE3; R2 and R3 are the AS border routers (ASBR, AS Border Router) of AS1, and R4, R5, R6 and R7 is the ASBR of AS2, R8 and R9 are the ASBRs of AS3; establish a multi-domain bidirectional LSP from R1 to R10, where the domain sequence is AS1→AS2→AS3, and the PCE sequence is PCE1→PCE2→PCE3.

[0097] Figure 8 It is a schematic flowchart of Embodiment 1 of the calculation method for realizing a multi-domain bidirectional label switching path in the present invention, as shown in Figure 8 As shown, the method includes:

[0098] Step 801, the PCC of R1 sends a PCReq message to PCE1;

[0099] Specifically, the PCC of R1 sends a PCReq message to PCE1, which always includes a request ...

Embodiment 2

[0109] Figure 9 It is a schematic diagram of the principle of Embodiment 2 of the method for calculating a multi-domain bidirectional label-switched path in the present invention. This embodiment is aimed at a method for calculating VSPT in a one-time calculation method, such as Figure 9 As shown, there are three ASs, AS1, AS2, and AS3, and three PCEs, PCE1, PCE2, and PCE3; R2 and R3 are the ASBRs of AS1, R4, R5, R6, and R7 are the ASBRs of AS2, and R8 and R9 It is the ASBR of AS3; establish a multi-domain bidirectional LSP from R1 to R10, the domain sequence is AS 1→AS2→AS3, and the PCE sequence is PCE1→PCE2→PCE3.

[0110] Figure 10 It is a schematic flowchart of Embodiment 2 of the calculation method for realizing a multi-domain bidirectional label switching path in the present invention, as shown in Figure 10 As shown, the method includes:

[0111] Step 1001, the PCC of R1 sends a PCReq message to PCE1;

[0112] Specifically, the PCC of R1 sends a PCReq message to P...

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Abstract

The invention discloses a method for computing a multi-domain bidirectional Label Switch Path (LSP), which includes the following steps: after receiving a Path Computation Request (PCReq) message, the Path Computation Element (PCE) of the domain in which the destination node locates computes a Virtual Shortest Path Tree (VSPT) on the basis of intra-domain bidirectional LSPs and unidirectional inter-domain link paths computed locally, and sends said VSPT to the PCE of the upstream domain; on the basis of intra-domain bidirectional LSPs and unidirectional inter-domain link paths computed locally and said VSPT, the PCE of the upstream domain computes a new VSPT and sends the new VSPT to the PCE of its own upstream domain; eventually, the PCE of the domain in which the source node locates sends a final VSPT to the source node. The invention also provides a system for computing a multi-domain bidirectional LSP. With the technical solutions of the invention, it can be achieved that a multi-domain bidirectional LSP from end to end is computed with Backward Recursive PCE-Based Computation (BRPC).

Description

technical field [0001] The invention relates to a Generalized Multiprotocol Label Switching (GMPLS, Generalized Multiprotocol Label Switching) protocol in the communication field, and in particular to a calculation method and system for a multi-domain bidirectional label switching path. Background technique [0002] In a multi-layer multi-domain network using the GMPLS protocol, a variety of nodes with different switching capabilities and rates can be divided into different domains or different layers according to actual needs. These domains can be router domains, Optical Transport Network (OTN, Optical Transport Network ) domain or Packet Transport Network (PTN, Packet Transport Network) domain, etc. In a multi-domain network divided by an autonomous system (AS, Autonomous System), PCE-based backward recursive path computation (BRPC, Backward Recuisive PCE-Based Computation) can be used to perform multi-domain path computation. [0003] The BRPC is described in the RFC5441...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/781H04L45/52
CPCH04L45/04H04L45/50H04L45/48
Inventor 卢刚汪学蓉王大江
Owner ZTE CORP
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