CN108768816B

CN108768816B - Multi-ring protection configuration method and system for PTN (packet transport network) ring network protection

Info

Publication number: CN108768816B
Application number: CN201810481413.4A
Authority: CN
Inventors: 张晶
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2018-05-18
Filing date: 2018-05-18
Publication date: 2020-10-09
Anticipated expiration: 2038-05-18
Also published as: CN108768816A

Abstract

The invention discloses a multi-ring protection configuration method and a multi-ring protection configuration system for PTN (packet transport network) ring network protection, and relates to the field of PTN ring network protection. The method comprises the following steps: for each ring of the intersecting ring relationship, adding an intersecting ring configuration of a corresponding entry, where the configuration is a sub-configuration of the overall ring configuration, each configuration includes: the intersecting ring KEY value, the intersecting node ID and the intersecting ring tag group; when the LSP binds more than three rings, three ring KEY values are configured for each LSP ring: the ring KEY value is a global index value configured by a ring, the ring is a ring that the LSP passes before entering the ring, the ring is the current ring, and the ring is a ring that the LSP continues to bind after exiting the ring. The invention can realize the ring network protection under the complex scene that the LSP binds more than three rings.

Description

Multi-ring protection configuration method and system for PTN (packet transport network) ring network protection

Technical Field

The invention relates to the field of PTN looped network protection, in particular to a multi-loop protection configuration method and a multi-loop protection configuration system for PTN looped network protection.

Background

With the continuous evolution of the internet era, the network coverage is rapidly expanded, the network bandwidth is continuously increased, the dependence of people on the network is stronger and stronger, and the network reliability plays an increasingly critical role in improving the user experience.

Under the conditions of single early networking structure and small traffic volume, the linear protection of the minimum unit can meet the basic requirement of network reliability, and the requirement of introducing different levels of different types of protection is not so urgent. With the continuous increase of the traffic, the layered processing of the linear protection is considered, the same type of services in the same path are packed together for protection switching, and meanwhile, the superposition of the protection functions in different layers can be realized, so that the reliability is improved, and the processing efficiency is also improved.

As networking topology becomes more complex, the defect of linear protection is gradually exposed, that is, the fault influence range is wider (one fault influences the whole link). The ring network protection is switched at the fault position, and the ring network protection plays a good supplementary role in linear protection. The configuration of ring network protection needs to consider a specific networking topology condition, and does not depend on a specific certain or some service configuration paths, and services of different paths can be bound on the same ring. The ring network protection is a protection at the outer layer of an LSP (Label switched path), and compared with linear protection, the ring network protection has the advantages of being capable of realizing batch switching, supporting multipoint fiber disconnection protection switching function, having a small influence range (switching is only performed at two ends of a fault node), and the like, and can be used in superposition with linear protection due to the outer layer of the linear protection. The introduction of ring network protection greatly improves the network reliability.

The standard corresponding to the Packet Transport Network (PTN) ring Network protection function is g.8132, and the latest standard is updated in month 8 of 2017. The original ring network protection scheme only relates to single-ring function, only one fault switching can be realized on each node, and then double-ring multipoint fault protection switching function is added. However, a single-ring topology and a single double-ring topology still have certain limitations in real networking, which is also one of bottlenecks affecting large-scale ring network deployment. When the service path is long and the topology of the current network is complex, one service may pass through three or more rings, and the simple single-ring and double-ring functions cannot meet the requirement of a switching scene to the maximum extent; in addition, the multi-ring topology is divided into a plurality of single-ring and double-ring combinations, and the complexity of early configuration planning and later problem positioning is increased to a certain extent. How to realize the ring network protection function in a complex scene of more than three rings becomes a technical problem to be solved urgently in the field.

Disclosure of Invention

The present invention aims to overcome the defects of the background art, and provides a method and a system for multi-ring protection configuration for PTN ring network protection, which can realize the ring network protection function in a complex scene in which an LSP binds three or more rings.

The invention provides a multi-ring protection configuration method for PTN looped network protection, which comprises the following steps:

for each ring of the intersecting ring relationship, adding an intersecting ring configuration of a corresponding entry, where the configuration is a sub-configuration of the overall ring configuration, each configuration includes: the method comprises the following steps that an intersecting ring KEY value, an intersecting node ID and an intersecting ring label group are included, the KYE value of the intersecting ring is a configuration index of the corresponding intersecting ring, the ID of the intersecting node is the number of the intersecting node in the ring, and the intersecting ring label group is a group of ring labels distributed to services entering the intersecting ring after the ring is placed on the ring;

when the LSP binds more than three rings, three ring KEY values are configured for each LSP ring: the ring KEY value is a global index value configured by a ring, the ring is a ring that the LSP passes before entering the ring, the ring is the current ring, and the ring is a ring that the LSP continues to bind after exiting the ring.

On the basis of the above technical solution, after the LSP binds three or more rings, the method further includes the following steps:

protection switching is carried out on nodes in the ring, and the specific process is as follows:

at the call node of the call ring, the LSP enters the call ring at the node, an intersecting ring label corresponding to the 'call ring' and the local ring is marked, the switching object is an intersecting ring label group, and the switching principle is a single-ring switching principle in G.8132;

at the call-up node of the local ring, the LSP pops up the cross ring label corresponding to the call-up ring and the local ring at the local node, and after the LSP label exchange, the cross ring label corresponding to the local ring and the call-down ring is marked; the switching principle is the combination of single-loop switching and cross-loop switching;

the other crossing node of the upper ring and the local ring which are symmetrical with the upper ring and the telephone node of the local ring, the LSP pops up the crossing ring label corresponding to the upper ring and the local ring at the node, and the crossing ring label corresponding to the upper ring and the lower ring is marked after the LSP label exchange is carried out; the switching principle is a single-ring switching principle of an intersecting ring tag group;

at an upper call node of a lower call ring, popping an intersecting ring label corresponding to the upper call ring and the lower call ring at the local node by the LSP, and marking a local ring label of the upper call ring and the lower call ring after LSP label switching is carried out; the switching principle is the combination of single-loop switching and cross-loop switching;

the other intersection node of the local ring and the lower voice ring which is symmetrical to the upper voice point of the lower voice ring, the LSP pops an intersection ring label corresponding to the local ring and the lower voice ring at the node, and a local ring label of the upper voice ring and the lower voice ring is marked after the LSP label exchange is carried out; the switching principle is a single-ring switching principle in G.8132;

the node of the ring through which the service passes, which is not the upper and lower call rings, does not have the relationship of the binding ring, and the switching principle follows the single-ring switching principle in G.8132.

On the basis of the above technical solution, among the three values of the wrapping ring KEY, the value of the local ring KEY of the LSP having the wrapping ring relationship is not 0, and the value of the upper ring KEY and the value of the lower ring KEY are zero or non-zero according to the actual situation.

On the basis of the above technical solution, when the LSP binds more than three rings, the method further includes the following steps: at another intersecting node of the intersecting ring, the LSP configuration information of the intersecting node is copied, and the next hop of the copied LSP is the intersecting node, so that the mutual protection of the two intersecting nodes and the node is realized.

On the basis of the technical scheme, at the calling node of the calling ring, the value of the KEY of the calling ring is zero, and the values of the KEY of the ring and the KEY of the calling ring are not zero;

at the node of the upper ring, that is, at the node of the lower ring of the upper ring, that is, at the intersection node of the upper ring and the lower ring, the KEY value of the upper ring, the KEY value of the lower ring and the KEY value of the upper ring at the node are all not zero;

the other crossing node of the ring and the ring, which is symmetric to the ring upper phone node, has a copied LSP on the node, the ring KEY value of the copied LSP is zero, and the ring KEY value and the ring lower KEY value are consistent with those before copying;

the upper ring KEY value and the lower ring KEY value of the node are not zero, and the lower ring KEY value is zero;

and the other intersected node of the local ring and the lower ring which is symmetrical to the upper ring KEY of the lower ring has LSP duplication, the local ring KEY value of the duplicated LSP is not zero, and the upper ring KEY value and the lower ring KEY value are both 0.

The invention also provides a multi-ring protection configuration system for PTN ring network protection, which comprises a first configuration unit and a second configuration unit, wherein:

the first configuration unit is used for: for each ring of the intersecting ring relationship, adding an intersecting ring configuration of a corresponding entry, where the configuration is a sub-configuration of the overall ring configuration, each configuration includes: the method comprises the following steps that an intersecting ring KEY value, an intersecting node ID and an intersecting ring label group are included, the KYE value of the intersecting ring is a configuration index of the corresponding intersecting ring, the ID of the intersecting node is the number of the intersecting node in the ring, and the intersecting ring label group is a group of ring labels distributed to services entering the intersecting ring after the ring is placed on the ring;

the second configuration unit is used for: when the LSP binds more than three rings, three ring KEY values are configured for each LSP ring: the ring KEY value is a global index value configured by a ring, the ring is a ring that the LSP passes before entering the ring, the ring is the current ring, and the ring is a ring that the LSP continues to bind after exiting the ring.

On the basis of the above technical solution, the system further includes a protection switching unit, where the protection switching unit is configured to:

after binding more than three upper rings by the LSP, protection switching is performed on nodes in the rings, and the specific process is as follows:

On the basis of the above technical solution, the system further includes an LSP configuration copying unit, where the LSP configuration copying unit is configured to: when the LSP binds more than three rings, the LSP configuration information of the intersection node is copied at the other intersection node of the intersection ring, and the copied LSP next hop is the intersection node, so that the mutual protection of the two intersections and the nodes is realized.

Compared with the prior art, the invention has the following advantages:

(1) the invention is based on single ring and double ring function, adds relative item intersecting ring configuration for each ring of intersecting ring relation, the configuration is sub-configuration of ring integral configuration, each configuration includes: the method comprises the following steps that an intersecting ring KEY value, an intersecting node ID and an intersecting ring label group are included, the KYE value of the intersecting ring is a configuration index of the corresponding intersecting ring, the ID of the intersecting node is the number of the intersecting node in the ring, and the intersecting ring label group is a group of ring labels distributed to services entering the intersecting ring after the ring is placed on the ring; when the LSP binds more than three rings, three ring KEY values are configured for each LSP ring: the ring KEY value is a global index value configured by a ring, the ring is a ring that the LSP passes before entering the ring, the ring is the current ring, and the ring is a ring that the LSP continues to bind after exiting the ring. The standard G.8132MPLS-TP shared ring protection scheme is expanded and upgraded, the function of multi-ring multi-point fiber breaking protection switching which is not mentioned in the standard and takes three rings as a unit is realized, the ring network protection function under the complex scene that LSP binds a plurality of rings is realized, the distance from the theory to the practice of the ring network protection function is effectively shortened, and the method has very important significance for accelerating the whole network deployment of the ring network protection function.

(2) The invention expands the function scene and enhances the easy operation of the configuration and the easy maintenance of the function.

Drawings

Fig. 1 is a schematic configuration diagram of a three-ring protection in an embodiment of the present invention.

Fig. 2 is a schematic diagram of single-loop switching in a three-loop according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of the present ring and dual ring switching in the three rings according to the embodiment of the present invention.

Fig. 4 is a schematic diagram of dual ring switching of the downlink ring in the three-ring according to the embodiment of the present invention.

FIG. 5 is a schematic diagram of the configuration of the four-ring protection in an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

Example 1

The LSP path may pass through a plurality of MPLS-TP shared rings, and the LSP is bound to each ring network segment by segment for the service path characteristics, so that segment-by-segment protection of the LSP path can be implemented. In order to implement the multipoint fiber breakage protection function to the maximum extent, the rings which are physically intersected can be associated, and the rings which are possibly associated with the same ring comprise an upstream ring and a downstream ring.

Example 2

On the basis of embodiment 1, after binding more than three rings by the LSP, the method further includes the following steps:

Example 3

In embodiment 2, of the three values of the wrapping ring KEY, the value of the present ring KEY of the LSP having the wrapping ring relationship is not 0, and the value of the previous ring KEY and the value of the next ring KEY are zero or non-zero according to actual conditions.

Example 4

On the basis of embodiment 3, when the LSP binds three or more rings, the method further includes the following steps: at another intersecting node of the intersecting ring, the LSP configuration information of the intersecting node is copied, and the next hop of the copied LSP is the intersecting node, so that the mutual protection of the two intersecting nodes and the node is realized.

Example 5

On the basis of embodiment 4, at the uplink node of the uplink ring, the value of the KEY of the uplink ring is zero, and the values of the KEY of the local ring and the KEY of the downlink ring are not zero;

Example 6

Embodiment 6 of the present invention provides a multiple ring protection configuration system for PTN ring network protection, where the system includes a first configuration unit and a second configuration unit, where:

Example 7

On the basis of embodiment 6, the PTN ring network protected multi-ring protection configuration system further includes a protection switching unit, where the protection switching unit is configured to:

Example 8

In example 7, of the three values of the loop KEY, the value of the local loop KEY of the LSP having the loop-binding relationship is not 0, and the values of the upper loop KEY and the lower loop KEY are zero or non-zero according to actual conditions.

Example 9

On the basis of embodiment 8, the multiple ring protection configuration system for PTN ring network protection further includes an LSP configuration replication unit, where the LSP configuration replication unit is configured to: when the LSP binds more than three rings, the LSP configuration information of the intersection node is copied at the other intersection node of the intersection ring, and the copied LSP next hop is the intersection node, so that the mutual protection of the two intersections and the nodes is realized.

Example 10

On the basis of embodiment 9, at the uplink node of the uplink ring, the value of the uplink ring KEY is zero, and the values of the local ring KEY and the downlink ring KEY are not zero;

The principles of embodiments of the present invention are explained in detail below.

Configuration processing of intersecting ring relations:

the typical scene of the double-ring protection function indicated in the g.8132 standard is a double-node intersection scene, and at this time, two intersection nodes are protected by each other, so that a protection function that cannot be realized by a single-ring function is achieved.

In order to achieve the purpose that two intersecting nodes protect each other, a group of intersecting ring-spanning labels is distributed to each intersecting ring (ring B) intersected with the ring (ring A) and used for marking a ring channel which is common to a ring-binding LSP (label action POP: POP) and enters the ring B after being dropped from the ring A, and the label groups are characterized in that the labels can be popped up (label action POP: POP) at the two intersecting nodes so as to achieve mutual protection, so that the configuration corresponding to the group of labels also needs to comprise intersecting node information.

Therefore, each ring of the intersecting ring relationship needs to add an intersecting ring configuration of a corresponding entry, the configuration is a sub-configuration of the ring overall configuration, and each configuration needs to include information: the method comprises the following steps that an intersecting ring KEY value, an intersecting node ID and an intersecting ring tag group are obtained, wherein the KYE value of the intersecting ring is a configuration index of the corresponding intersecting ring; the ID of the intersected node refers to the number of the intersected node in the ring; the intersecting ring label group is a group of ring labels distributed by the service entering the intersecting ring after the ring is placed on the lower ring of the ring.

And (3) configuration processing of a ring binding relation of LSP binding multiple rings:

when a binding ring LSP is to be connected to a ring at a certain node, there may be at most three rings associated with the binding ring LSP, i.e., a ring to be called at the node (ring a), a ring to be called from the node (ring B), and a ring to be called again after being called from ring B (ring C). Therefore, one LSP ring needs to record three information of the value of the KEY of the ring, which are respectively called: the ring KEY value is a global index value configured by a ring, the ring is a ring which is just passed before the LSP enters the ring, the ring is the current ring, and the ring is a ring to be continuously bound after the LSP exits the ring, where the ring KEY value information of the LSP having a ring-binding relationship is not necessarily 0, and the ring KEY value may be zero or non-zero according to actual conditions.

In addition, when one LSP binds multiple rings, at another intersecting node of the intersecting ring, the LSP configuration information of this intersecting node needs to be copied, and the next hop of the copied LSP is this intersecting node, thereby achieving the purpose of mutual protection of two intersecting nodes and nodes.

And (3) protection switching processing of each representative node:

the following 6 types of representative nodes are mainly available:

firstly, at the upper ring node of the upper ring, the upper ring KEY value of the node is zero, the local ring KEY value and the lower ring KEY value are not zero, the LSP enters the upper ring at the node, and an intersecting ring label corresponding to the "upper ring" and the local ring is marked, the specific state machine processing mode is similar to the single ring protection function introduced in the standard g.8132, the difference is that the switching object is an intersecting ring label group, and the specific switching principle is the same as the single ring switching principle in the g.8132, which is not described herein.

The other is that at the node of the local ring, that is, at the node where the local ring intersects with the local ring, the KEY value of the local ring, and the KEY value of the local ring are all nonzero. And popping up the crossed ring labels corresponding to the upper ring and the lower ring on the local node by the LSP, and marking the crossed ring labels corresponding to the upper ring and the lower ring after LSP label switching. The specific switching principle relates to a single-loop switching principle and a double-loop switching principle, wherein the single-loop switching principle is a single-loop switching principle of an intersecting loop tag group. The dual-ring switching principle refers to the patent "dual-ring escape implementation method and system for PTN ring network protection", and is not described again in detail.

Third, the other crossing node of the upper ring and the local ring which is symmetrical with the upper ring and the upper ring of the local ring, the node has a duplicated LSP, the upper ring KEY value of the duplicated LSP is zero, and the lower ring KEY value and the upper ring KEY value are consistent with those before duplication. And popping up the intersecting ring label corresponding to the upper ring and the lower ring on the upper ring by the LSP at the node, and marking the intersecting ring label corresponding to the upper ring and the lower ring after the LSP label exchange. The specific switching principle only relates to the single-ring switching principle of the intersecting ring tag group.

And fourthly, at the upper node of the lower ring, namely the lower node of the local ring, namely the intersection node of the local ring and the lower ring, the upper ring KEY value and the local ring KEY value of the node are not zero, and the lower ring KEY value is zero. The LSP pops up the crossed ring label corresponding to the ring and the lower ring at the node, and after the LSP label exchange, the local ring labels of the upper ring and the lower ring are marked. The specific switching principle is a combination of single-loop switching and cross-loop switching, and the switching principle and the call node of the local loop are not described in detail.

And fifthly, the node is the other intersected node of the local ring and the lower ring which are symmetrical to the upper ring KEY of the lower ring, LSP copy exists in the node, the KEY value of the local ring of the copied LSP is not zero, and the KEY value of the upper ring and the KEY value of the lower ring are both 0. The LSP pops up the crossed ring label corresponding to the local ring and the lower ring at the node, and the local ring labels of the upper ring and the lower ring are marked after the LSP label exchange. The switching principle is the same as the single-loop switching principle in G.8132.

Sixthly, the node which is not a call ring and is not a call ring is passed by the service, the node does not have a binding ring relation, and the switching principle follows the single-ring switching principle in G.8132.

It should be noted that when more than three multi-ring LSPs are bound, a three-ring principle can be used as a model for combination processing, which fully explains the wide application range of the method.

Referring to fig. 1, a node "one, two, three, five, six, seven and nine" is sequentially arranged from a node 1 to a node 6 on a ring 1, a node "three, four, five, six, seven and nine" is sequentially arranged from a node 1 to a node 6 on a ring two, and a normal path of an LSP is a node "one, two, three, four, five, six, seven and eight".

An intersecting ring relationship is configured for the ring 1 and the ring 2 (the node three and the node B are intersecting nodes), and an intersecting ring relationship is configured for the ring 2 and the ring 3 (the node five and the node ten are intersecting nodes).

The following intersecting ring configurations are added to the overall topology:

(1) ring 1:

configuration item one: an intersecting ring KEY value of 2, an intersecting node KEY value (3,4), an intersecting node tag group (8001,8002,8003,8004);

the interlace KEY value refers to a corresponding interlace index; the ID of the intersected node is the number of the intersected node in the ring, and the intersected ring is formed by the intersection of double nodes, so that two IDs of the intersected nodes exist; the total number of the crossed node label groups is 4, and the number is respectively as follows: clockwise working tags, counterclockwise working tags, clockwise protection tags, and counterclockwise protection tags.

(2) Ring 2:

configuration item one: an intersecting ring KEY value of 1, an intersecting node KEY value (6,1), an intersecting node tag group (8005,8006,8007,8008);

configuration item two: an intersecting ring KEY value of 3, an intersecting node KEY value (3,4), an intersecting node tag group (8009,8010,8011,8012);

(3) ring 3:

configuration item one: an intersecting ring KEY value of 2, an intersecting node KEY value (6,1), an intersecting node tag group (8013,8014,8015,8016);

note: the format specification of the intersected node is (intersected node 1, intersected node 2), and the format specification of the intersected node label group is (clockwise working label, anticlockwise working label, clockwise protection label, anticlockwise protection label).

Since the exchange on ring 3 involves local ring labels, assume that the label set for the outgoing call on ring 3 to node 10 is (401,402,403, 404).

Before the LSP is looped, the LSP label is pushed in at the first node, and popped out at the eighth node, and the other nodes, namely the second, third, fourth, fifth, sixth and seventh nodes, all execute the SWAP (switching) action of the LSP label.

After the LSP binds three rings simultaneously, the intermediate nodes on the ring, i.e. node two on ring 1, node four on ring 2, and node six on ring 3, do not perform any action on the LSP label any more, and only exchange the ring label, and the ring binding relationships and corresponding actions of the other typical nodes are described as follows:

(1) a first node:

the next hop node of the LSP is a node two, and the binding ring is configured to: (0,1, 2);

after the LSP is labeled on the node PUSH, an interworking ring working label 8001 on the PUSH, or a protection label 8004 after being transposed, is added;

(2) and a third node:

the next hop node of the LSP is node four, and the binding ring is configured as follows: (1,2, 3);

after the working label 8001 is output from POP on the node, LSP label SWAP is performed on LSP label, and meanwhile, the interworking ring working label 8009 on PUSH is also performed, or the rearranged protection label 8012 is performed;

(3) and a node B:

the next hop node of the LSP is node three, and the binding ring is configured as follows: (0,2, 3);

after the LSP sends out protection label 8004 on the node, LSP label SWAP is performed, and meanwhile, intersection ring working label 8009 on PUSH or inverted protection label 8012 is performed;

(4) and a fifth node:

the next hop node of the LSP is node six, and the binding ring is configured to: (2,3, 0);

after the working label 8009 is output from POP on the node by the LSP, performing SWAP on the label of the LSP, and simultaneously performing single-ring working label 401 on PUSH or switched protection label 404;

(5) and a node ten:

the next hop node of the LSP is node five, and the binding ring is configured to: (0,3, 0);

after the node POP has the protection label 8012, the LSP performs the LSP label SWAP, and at the same time, the upper single-ring working label 401 of PUSH, or the switched protection label 404;

(6) and eighth node:

after the node POP has the working label 401 or the reversed protection label 404, the LSP sends out an LSP label, and the service is called at the calling node;

note: the configuration format of the binding ring is specified as (upper ring KEY value, local ring KEY value, lower ring KEY value).

The implementation of the switching function in each ring is described below with reference to fig. 2-4:

in the scenario of fig. 2 where one failure occurs in each ring, if only linear protection is configured, a result of failure service interruption may occur in both main and standby rings, but ring protection services may be switched normally, and the implementation of specific switching is described as follows:

(1) in ring 1:

after detecting the fault, the node B performs switching, the label is switched to a protection label 8004 from a working label 8001, and the protection label is at a POP of the node B;

(2) in ring 2:

the ring label 8009 is put on the PUSH at the node b of the LSP, and since the failure between the node a and the node ten does not affect the primary path node b, node three, four and five, on the ring 2 of the LSP, the working label 8009 goes to the node five POP;

(3) in ring 3:

when the fifth node detects a fault and carries out switching, the LSP presses a protection label 404 in the fifth node, finally, a ring label 404 is popped out from the eighth node of the next node, and the LSP labels are popped out, thereby realizing normal next call of the service.

Fig. 3 only illustrates the dual-ring switching function of ring 2, and the rest paths are the same as the switching principle of fig. 2. In the ring 2, an LSP outputs an intersecting ring working label 8001 at a node three POP, then performs LSP label SWAP, executes an escape operation after detecting a far-end escape judgment condition, the intersecting ring protection label 8004 on the PUSH reenters the ring 1, the POP at the node b drops the intersecting ring label 8004, and performs LSP label SWAP, then a single ring switch occurs due to a fault between the node three and the node b, the intersecting ring protection label 8012 at the node b PUSH, at the node ten POP, then enters the ring 3.

Fig. 4 only illustrates the double-ring switching function model on the ring 3, and the rest paths are the same as the switching principle of fig. 2. In ring 3, the LSP drops the intersection ring label 8009 at the POP of node five, performs LSP label SWAP, performs an escape operation after detecting a near-end escape determination condition, enters the intersection ring protection label 8012 on PUSH again into ring 2, performs LSP label SWAP after dropping the intersection ring label 8012 at POP of node ten, then enters ring 3, and performs service drop at this node with the local ring protection label 404 at node ten PUSH, at node eight POP.

The invention is explained by taking three rings as basic units, and can also be applied to a multi-ring scene more than three rings, the difference is that if a plurality of rings are added, a plurality of pairs of binding ring intersecting nodes with the same three-node KEY value, the local ring KEY value and the lower ring KEY value being not zero and intersecting node B symmetrical to the binding ring intersecting nodes are added, and the switching principle is the same as that of the three rings.

On the basis of three rings, a pair of intersecting nodes is added for each ring, but the information of the binding ring is similar to that of the three rings, namely, each intersecting node still only needs to know the parameters of the three rings, namely the KEY value of the ring, the KEY value of the upper call ring and the KEY value of the lower call ring, the configuration of the nodes five and ten is marked in the figure 5 at the end of the document, and the configuration of the nodes five and ten is similar to that of the nodes three and the nodes B, except that the number of the corresponding KEY values is different according to the positions, for the multiple rings, the intersecting nodes which are the same as the nodes three and the nodes B are added for each ring, so the method has universality and can be popularized to a multiple ring scene.

Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.

What is not described in detail in the specification is prior art that is well known to those skilled in the art.

Claims

1. A multi-ring protection configuration method for PTN looped network protection is characterized by comprising the following steps:

when the LSP binds more than three rings, three ring KEY values are configured for each LSP ring: an upper ring KEY value, a local ring KEY value and a lower ring KEY value, wherein the ring KEY value is a global index value configured by a ring, the upper ring is a ring which is passed before an LSP enters the local ring, the local ring is the current ring, and the lower ring is a ring which is continuously bound after the LSP exits from the local ring; after binding more than three rings by the LSP, carrying out protection switching on nodes in the rings:

2. The PTN ring network protected multi-ring protection configuration method of claim 1, wherein: among the three values of the wrapping ring KEY, the value of the local ring KEY of the LSP having the wrapping ring relationship is not 0, and the value of the upper ring KEY and the value of the lower ring KEY are zero or non-zero according to the actual situation.

3. The PTN ring network protected multi-ring protection configuration method of claim 2, characterized in that: when the LSP binds more than three rings, the method further comprises the following steps: at another intersecting node of the intersecting ring, the LSP configuration information of the intersecting node is copied, and the next hop of the copied LSP is the intersecting node, so that the mutual protection of the two intersecting nodes and the node is realized.

4. The PTN ring network protected multi-ring protection configuration method as claimed in claim 3, wherein: at the upper call node of the upper call ring, the KEY value of the upper call ring is zero, and the KEY value of the local call ring and the KEY value of the lower call ring are not zero;

5. A multi-ring protection configuration system for PTN ring network protection is characterized by comprising a first configuration unit, a second configuration unit and a protection switching unit, wherein:

the second configuration unit is used for: when the LSP binds more than three rings, three ring KEY values are configured for each LSP ring: an upper ring KEY value, a local ring KEY value and a lower ring KEY value, wherein the ring KEY value is a global index value configured by a ring, the upper ring is a ring which is passed before an LSP enters the local ring, the local ring is the current ring, and the lower ring is a ring which is continuously bound after the LSP exits from the local ring;

the protection switching unit is used for: after binding more than three rings by the LSP, carrying out protection switching on nodes in the rings:

6. The PTN ring network protected multi-ring protection configuration system of claim 5, wherein: among the three values of the wrapping ring KEY, the value of the local ring KEY of the LSP having the wrapping ring relationship is not 0, and the value of the upper ring KEY and the value of the lower ring KEY are zero or non-zero according to the actual situation.

7. The PTN ring network protected multi-ring protection configuration system of claim 6, wherein: the system further comprises an LSP configuration replication unit, the LSP configuration replication unit being configured to: when the LSP binds more than three rings, the LSP configuration information of the intersection node is copied at the other intersection node of the intersection ring, and the copied LSP next hop is the intersection node, so that the mutual protection of the two intersections and the nodes is realized.

8. The PTN ring network protected multi-ring protection configuration system of claim 7, wherein: at the upper call node of the upper call ring, the KEY value of the upper call ring is zero, and the KEY value of the local call ring and the KEY value of the lower call ring are not zero;