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

A path calculation unit and path protection technology, which is applied in the field of communication, can solve problems such as the inability to achieve optimal paths, and achieve the effects of saving path calculation time, realizing paths, and improving efficiency

Inactive Publication Date: 2011-04-27
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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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 the PCRep (Path Computation 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 th...

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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PUM

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Abstract

The invention discloses a method and system for protecting a path based on a PCE (Patch Computation Element), solving the technical problem that the present path protecting method can not realize the path optimization. The method of the invention comprises the following steps that: a detection node of a fault resource notifies network failure information to the PCE when a network has a failure, the PCE finds out a path influenced by a resource failure, computes recovery paths to paths needing to be protected, and notifies the computed recovery paths to the detecting node of the fault resource; and the detection node of the fault resource recovers relative paths according to the recovery paths. The path protection computation is carried out by the PCE; and because the PCE knows the engineering information of flow rate in/among domains, the invention is beneficial to realizing the optimization of the path and improving the utilization rate of the network resource.

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, Multi-Protocol Label Switching) / GMPLS (Generalized Multi-Protocol Label Switching, General Multi-Protocol Label Switching) network structure based on the Path Computation Element (PCE, Path Computation Element), the PCE is the 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 (O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04B10/08H04L45/28H04L45/50
CPCH04L41/0668H04L45/50H04L45/28H04L45/42H04L45/22
Inventor 田国丽鲍远林
Owner ZTE CORP
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