CN101656572B - Method for realizing permanent shared restoration in ASON network - Google Patents

Abstract

A method for realizing permanent shared restoration in an ASON network comprises steps of establishing a shared restoration service from a source node A to a host node C; when a working LSP path 1 faults, activating a protective LSP path 2 to be current working LSP path, and establishing a new protective LSP path 3 for the present working LSP path; when the present working LSP path faults, activating the protective LSP path 3 to be current working LSP path, and establishing a new protective LSP path 4 for the present working LSP path. Through the inventive method, under the presence of resource, a shared restoration state is kept, namely each working LSP is associated with a protective LSP, when the protective LSP is activated to be new working LSP, a new protective LSP is associated therewith, when the protective LSP fault, a new protective LSP is certainly associated with the present working LSP.

Description

A kind of method that in the ASON network, realizes permanent shared restoration

Technical field

The present invention relates to the recovery technology in the ASON network, a kind of specifically method that in the ASON network, realizes permanent shared restoration.

Background technology

In the ASON network, protected mode and two kinds of resist technologies of reset mode are provided to business.Comparatively speaking, the switching time of protected mode is short, and business recovery is fast, but the stock number that protected mode takies is bigger; Reset mode does not take resource in advance, just under the situation of traffic failure, just recomputates route, and like this business recovery time is longer relatively.So a kind of new utilization ratio that can improve resource conservation takies less relatively resource conservation, and the professional service restoration method short than reset mode recovery time be suggested, and is exactly to share formula recovery (Shared-Mesh Restoration).

The thought of sharing the formula recovery is based on the reset mode of pre-planned re-routingwithout extra-traffic end to end; The basic thought of this mode is: before the working LSP fault; Just, reserve resource conservation along the stand-by protection path, but the information of this reservation resource conservation only is present in control plane for it calculates a stand-by protection path; Before the working LSP fault, information such as the protection paths intersect of this reservation resource conservation, configuration really are not set to datum plane.Have only when working LSP breaks down, control plane start to recover flow process, activate calculating good protection LSP in advance, and the process of activation is exactly information such as the protection paths intersect of reserving resource conservation, configuration to be set to datum plane.Reserve resource conservation in different transmission networks, corresponding meaning is different: as in the SDH network, what the reservation resource conservation referred to is exactly time slot; In the OTN network, reserve resource conservation and also possibly comprise information such as wavelength; Transmit in the net at PTN, reserve resource conservation and comprise label and bandwidth etc.

But only defined the principle that shared formula is recovered on the related protocol; The activation of corresponding protection LSP after the working LSP fault just; But the processing procedure after protection LSP is activated into new working LSP is not described; And the processing method behind the protection lsp failure, and in the application of reality, both of these case is an objective reality.So there is following shortcoming in it:

1, after the working LSP fault, corresponding protection LSP can be activated to substitute working LSP, becomes new working LSP, and new working LSP need be created new protection LSP and realize sharing the formula recovery, otherwise in a single day new working LSP just can't be protected after the fault once more;

2, protection LSP if break down, then can't provide protection for the working LSP of correspondence before activation, need to create new protection LSP, otherwise current working LSP just can't be protected.

Publication number is CN1556637's in " a kind of method of in grid network, utilizing shared backup channel to carry out fault recovery "; After having described the working LSP fault; The concrete behavior that protection LSP activates, comprise other share protect resource protection LSP since wherein certain protection LSP be activated and can't continue the processing of shared resource.But also fail to provide the solution of above-mentioned shortcoming.

Summary of the invention

To the defective that exists in the prior art; The object of the present invention is to provide a kind of method that in the ASON network, realizes permanent shared restoration; Under the situation that resource exists; Can remain the state that a kind of shared formula is recovered, it is related with it that promptly each working LSP must have a protection LSP: after protection LSP is activated into new working LSP, must have a new protection LSP related with it; After protection LSP breaks down, must there be a new protection LSP to be associated with current working LSP.

For reaching above purpose, the technical scheme that the present invention takes is:

A kind of method that in the ASON network, realizes permanent shared restoration is characterized in that may further comprise the steps:

Step 1, set up one and recover professional to the shared formula of destination node C by source node A: obtain working LSP path 1, and the protection LSP path 2 corresponding with working LSP path 1;

Step 2 when 1 fault of working LSP path, then will protect LSP path 2 to activate into current working LSP path, under the situation that resource allows, for setting up new protection LSP path 3 in current working LSP path;

Step 3; When current working LSP path failure; Then will protect LSP path 3 to activate into current working LSP path; Under the situation that resource allows, set up new protection LSP path 4 for current working LSP path, make current working LSP path have corresponding protection LSP path related with it all the time.

On the basis of technique scheme, when current protection LSP path failure, further comprising the steps of:

Step 4 is for create new protection LSP path in current working LSP path again;

Step 5, the protection LSP path of deletion fault;

Step 6 when current working LSP path failure, then activates into current working LSP path with new protection LSP path, under the situation that resource allows, for setting up new protection LSP path in current working LSP path.

The method that in the ASON network, realizes permanent shared restoration of the present invention; Under the situation that resource exists; Can remain the state that a kind of shared formula is recovered; Be that each working LSP must have a protection LSP related with it: after protection LSP is activated into new working LSP, must have a new protection LSP related with it; After protection LSP breaks down, must there be a new protection LSP to be associated with current working LSP.

Description of drawings

The present invention has following accompanying drawing:

Fig. 1: ASON network topology;

Fig. 2: the shared formula LSP/ protection LSP that resumes work;

Fig. 3: the processing after working LSP 1 fault;

Fig. 4: the processing after the work at present LSP2 fault;

Fig. 5: the processing after the protection LSP2 fault;

Fig. 6: the processing after current working LSP 1 fault.

Embodiment

The invention discloses a kind of method that in the ASON network, realizes permanent shared restoration, it is characterized in that may further comprise the steps:

Step 1, set up one and recover professional to the shared formula of destination node C by source node A: obtain working LSP path 1, and the protection LSP path 2 corresponding with working LSP path 1;

Step 2 when 1 fault of working LSP path, then will protect LSP path 2 to activate into current working LSP path, under the situation that resource allows, for setting up new protection LSP path 3 in current working LSP path;

Step 3; When current working LSP path failure; Then will protect LSP path 3 to activate into current working LSP path; Under the situation that resource allows, set up new protection LSP path 4 for current working LSP path, make current working LSP path have corresponding protection LSP path related with it all the time.

On the basis of technique scheme, when current protection LSP path failure, further comprising the steps of:

Step 4 is for create new protection LSP path in current working LSP path again;

Step 5, the protection LSP path of deletion fault;

Step 6 when current working LSP path failure, then activates into current working LSP path with new protection LSP path, under the situation that resource allows, for setting up new protection LSP path in current working LSP path.

Said working LSP path comprises some working LSP in the technique scheme, and said protection LSP path comprises some protection LSP.

The said permanent shared restoration of the present invention, to be following two kinds of scenes: 1, after the working LSP fault; 2, behind the protection lsp failure.

1. the processing after the working LSP fault

Just defined the recovery action after the working LSP fault in the standard, i.e. activation manipulation: activate for presorting the reservation resource conservation for preparing, share, be provided with and intersect data, revise corresponding resource status to transmitting the plane.But and the action after the undefined activation.

The method of the said permanent shared restoration of the present invention is: after the working LSP fault, after corresponding protection LSP is activated into new working LSP, sets up new protection LSP and be associated with new working LSP.

According to such mentality of designing, under the condition that resource allows, current working LSP necessarily has corresponding protection LSP and is associated.In case current working LSP fault necessarily has corresponding protection LSP and is activated into new working LSP, and under the situation that resource allows, also can set up new protection LSP for new working LSP, realize that the shared formula on a kind of permanent meaning is recovered.

2. protect the processing behind the lsp failure

Here said protection LSP is the protection LSP that is not activated.In case behind the protection lsp failure, if do not take measures, then corresponding working LSP unprotect resource can be used, in case this moment the working LSP fault, then can cause professional interruption.

In order to address this problem, to this application scenarios, the present invention proposes other a kind of method that realizes permanent shared restoration: for current working LSP recomputates new protection LSP.And, make it no longer share the resource conservation of correspondence because the original protection LSP that sets up fault then can be deleted this protection LSP.

Beneficial effect of the present invention is: through in network, implementing the method for permanent shared restoration, current working LSP has protection LSP to be associated with it all the time and protection is provided under the condition that resource allows.New protection LSP can use the current resource that is in shared state, and can be shared by the corresponding new protection LSP of other working LSP; New protection LSP just can use by the resource conservation of sharing, and so just can try one's best under few prerequisite taking Internet resources, for important service provides protection chance as much as possible, reduces the probability that service protection and recovery are failed.

Below in conjunction with accompanying drawing the present invention is done further explain.

1. the processing after the working LSP fault

As shown in Figure 1: described an ASON network among the figure, it can be based on transmission technologys such as SONET/SDH, OTN and PTN.

1, to set up one and suppose that by the shared formula recovery business of source node A working LSP 1 path is [A, G, C] to destination node C, corresponding protection LSP2 path is [A, F, C], like Fig. 2 institute not.

2, if working LSP 1 [A, G, C] fault is then protected LSP2 [A, F, C] to be activated into current working LSP, and set up new protection LSP3 for it, suppose its path for [A, B, C], as shown in Figure 3.

3, if current working LSP 2 [A, F, C] fault once more, then corresponding protection LSP3 [A, B, C] is activated into current working LSP, and sets up new protection LSP4 for it again, supposes that its path is [A, D, E, C], and is as shown in Figure 4.Just under the situation that resource allows, current working LSP has corresponding protection LSP to be associated all the time.

2. protect the processing behind the lsp failure

Also be to use topology as shown in Figure 1, described an ASON network among the figure, it can be based on transmission technologys such as SONET/SDH, OTN and PTN.

1, to set up one and suppose that by the shared formula recovery business of source node A working LSP 1 path is [A, G, C] to destination node C, corresponding protection LSP2 path is [A, F, C], and is as shown in Figure 2.

2, if protection LSP2 [A, F, C] fault is created new protection LSP3 for current working LSP 1, suppose its path for [A, B, C], as shown in Figure 5; The protection LSP2 [A, F, C] of deletion fault is to discharge resource.

3, if working LSP 1 [A, G, C] fault, then newly-built protection LSP3 [A, B, C] is activated and becomes current main usefulness, and creates new protection LSP4 for it again, and its path is [A, D, E, C].As shown in Figure 6.

The method of the invention does not limit the bottom transmission technology, can be applicable to ASON network and other various types of traffic engineered networks based on SONET/SDH, OTN and PTN.

Claims (1)

1. method that in the ASON network, realizes permanent shared restoration is characterized in that may further comprise the steps:

Step 1, set up one and recover professional to the shared formula of destination node C by source node A: obtain working LSP path 1, and the protection LSP path 2 corresponding with working LSP path 1;

Step 2 when 1 fault of working LSP path, then will protect LSP path 2 to activate into current working LSP path, under the situation that resource allows, for setting up new protection LSP path 3 in current working LSP path;

Step 3; When current working LSP path failure; Then will protect LSP path 3 to activate into current working LSP path; Under the situation that resource allows, set up new protection LSP path 4 for current working LSP path, make current working LSP path have corresponding protection LSP path related with it all the time;

Said working LSP path comprises some working LSP, and said protection LSP path comprises some protection LSP;

When current protection LSP path failure, and said protection LSP is further comprising the steps of when being the protection LSP that is not activated:

Step 4 is for create new protection LSP path in current working LSP path again;

Step 5, the protection LSP path of deletion fault;

Step 6 when current working LSP path failure, then activates into current working LSP path with new protection LSP path, under the situation that resource allows, for setting up new protection LSP path in current working LSP path.

Images