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Method and system for protecting path based on PCE (Patch Computation Element)

A path calculation unit and path protection technology, applied in the field of communications, can solve problems such as the inability to achieve optimal paths, and achieve the effects of saving path calculation time, improving utilization, and increasing the probability of successful path calculation.

Inactive Publication Date: 2013-06-05
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the main purpose of the present invention is to provide a path protection method based on path calculation units, which is used to solve the technical problems that existing path protection methods cannot achieve path optimization and cross-domain LSP protection

Method used

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  • Method and system for protecting path based on PCE (Patch Computation Element)
  • Method and system for protecting path based on PCE (Patch Computation Element)
  • Method and system for protecting path based on PCE (Patch Computation Element)

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Experimental program
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Embodiment 1

[0035] figure 2 It is a schematic diagram when a single network resource in the network of the present invention fails and recovers. One of the services that initially passes through routers A to Z, the corresponding label switching path (LSP) is LSP1, and the path is A-C-F-Z, which corresponds to the thick solid line in the figure. The path F-G-Z indicated by the dotted line is the recovery path.

[0036] combine figure 2 Firstly, node A uses a PCRep (PathComputation Reply) message in the extended PCEP protocol to request the PCE for the A-Z service and the A-Z service request path. The PCE returns the calculated path to node A, where the service of A-Z corresponds to LSP1, and the path is A-C-F-Z.

[0037] At some point the network fails, where link F-Z breaks a fiber. Node F, which detects a resource failure, reports this information to the PCE. The node F can use the Open Shortest Path First (Open Shortest Path First, OSPF) protocol to flood in the domain, and the P...

Embodiment 2

[0054] image 3 It is a schematic diagram of failure of two network resources in the network of the present invention. One of the A-H services corresponds to the LSP1 path as A-C-F-G-H; the other A-Z service corresponds to the LSP2 path as A-C-F-Z. After node C detects that the link C-F is disconnected, it sends this information to the PCE.

[0055] combine image 3 , first node A uses PCReq message to request PCE for A-H service and A-Z service request path. The PCE returns the calculated path to node A, where the service of A-H corresponds to LSP1, and the path is A-C-F-G-H; the service of A-Z corresponds to LSP2, and the path is A-C-F-Z.

[0056] If the network fails at a certain moment, and the link C-F is broken, the node C will report this information to the PCE. The nodes can use the OSPF protocol to flood in the domain, and the PCE participates in the flooding in the domain, so as to learn resource failure information.

[0057] Figure 4 based on image 3 Schema...

Embodiment 3

[0073] Figure 5 It is a schematic diagram of multiple failures and recovery in the network. There are three LSPs initially, corresponding to the thick solid lines LSP1 (the path is A-B-D-E-H), LSP2 (the path is A-C-F-G-Z), and LSP3 (the path is A-C-F-Z). At a certain moment, links B-D, G-H, and F-Z fail, and their corresponding recovery paths are the dotted line segments B-C-D, G-Z-H, and F-G-Z in the figure.

[0074] combine Figure 5 , firstly, there are two A-H and one A-Z services in the network. One of the A-H services corresponds to LSP1, and the path is A-C-F-G-H; the other A-H service corresponds to LSP2, and the path is A-C-F-G-H; the A-Z service corresponds to LSP2, and the path is A-C-F-Z.

[0075] At some point the network fails, where links B-D, F-Z, G-H break fibers. Nodes B, F, G report this information to the PCE.

[0076] After the PCE learns that links B-D, F-Z, and G-H are broken and faulty, it first checks that LSP1, LSP2, and LSP3 are affected. Then...

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Abstract

Disclosed is a path-computation-element (PCE)-based method for path protection in the invention, the method serves to solve the technical problem that the existing path protection method can not achieve path optimization. In the invention, when a network fault occurs, a detection node for the fault resources notifies the network fault information to the PCE; the PCE finds out paths influenced by the resource fault, computes recovery paths for the paths which require protection, and then notifies the computed recovery paths to the detection node for the fault resources; the detection node for the fault resources recovers the related paths according to said recovery paths. The invention performs the path protection computation using the PCE, and because the PCE knows about the intra-domain and inter-domain traffic engineering information, the invention is beneficial to achievement of the path optimization and improvement of the utilization rate of network resources.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and a system for realizing service protection using a path calculation unit in an automatic switching optical network. Background technique [0002] In the MPLS (Multi-Protocol Label Switching) / GMPLS (Generalized Multi-Protocol Label Switching) network structure based on the Path Computation Element (PCE, Path Computation Element), the PCE is a special The functional entity responsible for path computation, it calculates an optimal path satisfying the constraints based on the known network topology and constraints, and according to the request of Path Computation Clients (PCC, Path Computation Clients). The PCE can be located anywhere in the network, and can be integrated inside network equipment, such as inside a label switching router (Label Switching Route, LSR), or inside a telecom operation support system (Operation Support Systems, OSS), or it can be a standalone device....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/703H04L12/723H04L45/28H04L45/50
CPCH04L41/0668H04L45/50H04L45/28H04L45/42H04L45/22
Inventor 田国丽鲍远林
Owner ZTE CORP
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