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Method and system for establishing a protection path in a network protected by a shared grid

A technology for protecting paths and networks, applied in the field of network communication, can solve the problems of increasing the processing complexity of intermediate nodes, slowing down the speed of protection paths, and blocking the protection paths, so as to shorten the time of path switching, reduce the processing time, and reduce the number of processing times. Effect

Active Publication Date: 2017-07-21
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the existing mechanism, due to the barrier of the protection path, the APS (Automatic Protection Switched) mechanism of the channel layer cannot be run
[0008] If APS at the segment level is run between each segment, each node will process the round-trip APS message, which will increase the processing complexity of the intermediate node. When performing traffic switching, the speed of establishing a protection path will change slow
[0009] Shared MESH protection involves issues such as resource release and resource preemption, and the existing APS mechanism cannot meet the needs

Method used

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  • Method and system for establishing a protection path in a network protected by a shared grid
  • Method and system for establishing a protection path in a network protected by a shared grid
  • Method and system for establishing a protection path in a network protected by a shared grid

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Embodiment 1

[0101] image 3 It is a schematic diagram of implementing a shared grid protection. Such as image 3 As shown, W1 is the working path, P1 is the protection path of W1, W2 is the working path, and P2 is the protection path of W2. The path passed by P1 is A-E-F-B, which is composed of three sections PS1-PS3-PS4, and the path passed by P2 is C-E-F-D, which is composed of PS2-PS3-PS5. P1 and P2 share resources of the PS3 segment. PS1, PS2, PS3, PS4, and PS5 are all OTU (Optical Transform Unit, optical transformation unit) type 2 links. ODU2 can carry 8 ODUs (Optical channel Data Unit, optical channel data unit) 0, that is, a protection group of 8 ODU0s can be established. In this example, one of the ODU0 protection groups is taken as an example. In this shared protection group , there are two members, P1 and P2, sharing the resources of ODU0. Deploy a TCM on each section of the protection path, and the TCM occupies the overhead of ODU0.

[0102] The starting node on a ...

Embodiment 2

[0113] After the working path is restored, the traffic needs to be switched back to the working path, and the occupied shared resources on the protection path need to be released.

[0114] The release of resources needs to be realized through TCM, such as image 3 As shown, TCM needs to be deployed between each segment, that is, TCM is deployed on PS1, PS2, PS3, PS4, and PS5. In this topology, a single-layer TCM is deployed.

[0115] The first and last endpoints send revert messages to each other, indicating that traffic needs to be switched back. The head and tail endpoints wait for the recovery timer locally; when the recovery timer expires, the head and tail endpoints switch the traffic from the protection path to the working path; and then initiate the resource release of the protection path.

[0116] Figure 5 It is a sequence diagram of resource release of the protection path in the second embodiment. Figure 5 Timing diagram shown, including:

[0117] S...

Embodiment 3

[0124] In shared protection, because the resources of the protection path are shared by two protection paths, when the working path of the shared resource fails at the same time, resource preemption will occur. During resource preemption, the resource with the highest priority occupies the resource, and the priority is divided into fault priority, service priority, and so on. The priority is processed according to the policy configured locally, and the one with the higher priority occupies resources.

[0125] Figure 6 It is a schematic diagram of the shared grid protection in the third embodiment. Such as Figure 6 As shown, when W1 fails, P1 has already occupied the resource of the shared path. During the period of W1 failure, W2 also fails. At this time, resource preemption processing is required. In this example, it is assumed that P2 has a higher priority than P1.

[0126] Figure 7 It is a sequence diagram of resource release of the protection path in the th...

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Abstract

The invention provides a method and a system for establishing a protection path in a network protected by a shared network, and relates to the field of network communication. The method comprises the steps as follows: acquiring the used field in a response message which is sent by a tail node on a working path and is used for indicating successful establishment of the protection path by a management node, and configuring at least one node on the protection path to not analyze the unused field in the response message; in the process of establishing the protection path, if the tail node on the working path detects that the protection path is successfully established, sending out the response information loaded by the unused field in the response message through the successfully established protection path; and receiving the response information and determining that the protection path is successfully established by a head node on the working path. The invention further discloses the system for establishing the protection path in the network protected by the shared network. According to the embodiment of the invention, the processing frequency of the node on the message is reduced.

Description

technical field [0001] The invention relates to the field of network communication, in particular to a method and system for establishing a protection path in a network protected by a shared grid. Background technique [0002] Traditional optical transmission networks are mainly based on ring network or linear topology, which can provide multiplex section ring protection, channel ring protection, linear 1:1 multiplex section protection, linear 1+1 multiplex section protection, and end-to-end SNCP (sub- Network connection protection) protection and a series of protection measures. Under the premise of supporting single link failure, traditional optical networks need to reserve protection resources that almost constantly occupy 50% of the entire network bandwidth resources, and the bandwidth utilization rate is only 50%. [0003] In fact, in most cases, the probability of multiple faults occurring at the same time is very small. RFC4872 proposes a shared recovery mechanism ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/24
Inventor 富森张媛媛
Owner ZTE CORP
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