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Method for protecting and recovering cross-domain end-to-end label switched path

A label switching path, protection and restoration technology, applied in the field of automatic switching optical networks, can solve the problems of detailed specifications, immature development of standards, and lack of uniform implementation, and achieve the effect of improving survivability

Active Publication Date: 2012-10-17
WUHAN POST & TELECOMM RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for inter-domain faults, there is no mature and sound technology to solve the problem of protection recovery implementation
At present, ENNI (Exernal Network Network Interface, external network interface) technology communicates through the signaling intercommunication of the control plane. Its original goal is to solve the cross-domain end-to-end LSP problem, but so far, ENNI is still in the experimental stage. , the development of relevant standards is immature, and the definition of protection and restoration of cross-domain end-to-end LSP is quite weak
In addition, there is no uniform and detailed specification for the interoperability of ENNI signaling between multiple manufacturers. The differences in protocol understanding and implementation details often lead to a large amount of debugging during interoperability, which is not conducive to project activation and maintenance.
Therefore, the current ENNI technology cannot effectively solve the problem of cross-domain end-to-end LSP protection and recovery

Method used

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  • Method for protecting and recovering cross-domain end-to-end label switched path
  • Method for protecting and recovering cross-domain end-to-end label switched path
  • Method for protecting and recovering cross-domain end-to-end label switched path

Examples

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Effect test

no. 1 example

[0046] Such as figure 1 As shown in FIG. 1 , it is a schematic diagram of the protection and restoration of a 1+1 cross-domain end-to-end LSP source domain and sink domain in the present invention. When the first optical fault occurs, the service is switched to figure 1 The protection path shown, that is, A1-A3-B4-B3-C4-C2 is used as the new working path. At the same time, the working path A1-A2 in domain A starts dynamic recovery immediately, and the recovery path is A1-A4-A2, forming a new protection path A1-A4-A2-B1-B2-C1-C2 of the end-to-end LSP. This failure will cause the 1+1 protection group of the source node A1 to change, and the protection objects to which the original protection paths A1-A3 in the source domain belong are upgraded to the protected objects in the 1+1 protection group. The new path A1-A4-A2 dynamically restored in the source domain is a newly added protected object, pointing to the current protected object A1-A3 in this group. The sink node C2 perf...

no. 2 example

[0049] Such as figure 2 As shown in FIG. 1 , it is a schematic diagram of single-failure protection recovery in the 1+1 cross-domain end-to-end LSP intermediate domain. When a fiber optic failure occurs in figure 2 In the position shown, the service will be switched to the protection path A1-A3-B4-B3-C4-C2 as the new working path, but the protection relationship of the 1+1 protection group between the source node and the sink node will not be changed. The original working path B1-B2 in domain B starts dynamic recovery immediately after the fault occurs, and the recovery path is B1-B4-B2 or B1-B3-B2, forming a new protection path A1-A2-B1-B4 of the end-to-end LSP (B3)-B2-C1-C2.

no. 3 example

[0051] Such as image 3 As shown in FIG. 1 , it is a schematic diagram of 1+1 cross-domain end-to-end LSP inter-domain single fault protection and restoration. When a fiber optic failure occurs in image 3 In the position shown, the service is switched to the protection path A1-A3-B4-B3-C4-C2 as the new working path by using the alarms that can be communicated at the transport plane layer; Interim failure does not initiate dynamic recovery.

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Abstract

The invention discloses a method for protecting and recovering a cross-domain end-to-end label switched path and relates to the field of an automatic switched optical network. The method comprises the following steps of: S1, building a work path and N protection paths, wherein N is greater than or equal to 1; S2, judging the path in which a fault occurs, if the path is the work path, carrying out protection switching on business, and judging the position at which the fault is at the same time; if the position is in a source domain, a host domain or an intermediate domain, triggering one protection path bypassing a fault point in the domain in which the fault occurs; splicing the protection path with the protection paths without the fault in the other domains to form a new protection path; if the position is between the domains, performing no triggering on recovery of the work path with the fault; and if the fault is on the protection path, needing no protection switching on the business, triggering one new protection path in the domain, and splicing the protection path with the protection path without the fault in other domains to form another new protection path. According to the invention, by protecting, restoring and splicing an LSP (link state packet) of each segment, multipoint faults in the domains or between the domains are effectively resisted, and high reliability requirements of cross-domain business are met.

Description

technical field [0001] The invention relates to the field of automatic switching optical network, and specifically relates to a method for protecting and restoring cross-domain end-to-end label switching paths. Background technique [0002] ASON (Automatically Switched Optical Network, Automatically Switched Optical Network) emerges as the times require with the demand for flexibility in service scheduling in optical networks. The automatic control function of the ASON network is mostly reflected in a control domain, including: establishment and deletion of services, protection and recovery when services fail, and automatic return after faults are cleared. [0003] When an ASON network consists of equipment from multiple manufacturers, in order to shield the differences in the details of equipment from different manufacturers and protect its own key technologies, the equipment of each manufacturer usually forms an ASON control domain separately, and communicates with equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04B10/08H04L12/24
Inventor 蒋玉玲朱冰陈鹏高晓琪付文利
Owner WUHAN POST & TELECOMM RES INST CO LTD
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