CN101626527A

CN101626527A - Recoverable shared restoration method for optimizing spare routing by automatic switched optical network (ASON)

Info

Publication number: CN101626527A
Application number: CN200910163001A
Authority: CN
Inventors: 宋然; 朱冰; 蒋玉玲; 高军; 盛伟; 张炳焱
Original assignee: Fiberhome Telecommunication Technologies Co Ltd
Current assignee: Fiberhome Telecommunication Technologies Co Ltd
Priority date: 2009-08-19
Filing date: 2009-08-19
Publication date: 2010-01-13

Abstract

The invention relates to a recoverable shared restoration method for optimizing spare routing by an automatic switched optical network (ASON) and relates to an ASON protection technology. The recoverable shared restoration method comprises the following steps: (1) establishing a shared restoration service; (2) achieving a shared spare LSP path 2 to be used as a present shared working LSP path and establishing a new shared spare LSP path 3 if a shared working LSP path 1 fails; (3) achieving the shared spare LSP path 3 and establishing a new shared spare LSP path 4 if the present shared working LSP path also fails; (4) returning the service to the shared working LSP path 1 when failures of the shared working LSP path 1 are cleared; and (5) calculating a more optimized shared spare LSP path for the shared working LSP path 1. The method implements recoverable shared restoration in the network and can optimize the routing of a spare LSP after the shared service is returned to an original working path under the condition that a path more optimized than the present spare LSP path exists.

Description

A kind of ASON network is realized the method for the recoverable shared restoration that alternate routing is optimized

Technical field

The present invention relates to ASON network protection technology; a kind of specifically ASON network is realized the method for the recoverable shared restoration that alternate routing is optimized; this method 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.

Background technology

In the ASON network, protection and the mode of recovering are provided to business.Comparatively speaking, the mode switching time of protection is short, and business recovery is fast, but the stock number that takies is bigger; The mode of recovering does not take resource in advance, just just recomputates route under the situation of traffic failure, 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 short service restoration method of professional recovery time of more common reset mode has been suggested, and is exactly to share formula to recover.

The thought of sharing formula recovery (Shared-Mesh Restoration) is based on the reset mode of pre-planned re-routing without extra-traffic end to end; the basic thought of this mode is: before the working LSP fault; just calculate a restoration path for it; reserve resource conservation along restoration path; but this resource information just is present in control plane; before the working LSP fault, the protection paths intersect really is not set to datum plane.Have only when working LSP breaks down, in the recovery flow process that control plane starts, activate, in current flow process, just datum plane information can be set precalculated standby LSP.

The principle of the shared formula recovery that defines on the agreement has been introduced in top description, in recoverable shared recovery design, if adopt a kind of shared recovery implementation of permanent type, after shared standby at every turn LSP activates, all can be that the standby LSP of current activation creates new standby LSP.The realization that the shared formula of permanent type is recovered; can provide the chance of protection as much as possible for working LSP; but; the route result calculated is always preferentially selected optimized route; along with the increase of protection number of times, the route of newly-built standby LSP may no longer be optimized with respect to the route of the standby LSP of fault.After the most original operating path fault was got rid of, business can turn back to the most original working LSP, and then the route of the standby LSP of its correspondence may not optimized at this moment.And, should there be the standby LSP route of more optimizing in the system along with the recovery of fault resource in pilot process.

Through existing patent is retrieved, we do not have to find to realize the relevant patent of the recoverable shared restoration that alternate routing is optimized in the ASON network.Requiring immediate invention with the present invention is " a kind of method of utilizing shared backup channel to carry out fault recovery in grid network ", and its publication number is CN1556637.After shared working LSP fault has mainly been described in this invention; share the concrete behavior that standby LSP activates; comprise other share protect resource shared standby LSP since wherein the standby LSP of certain bar be activated and can't continue the processing of shared resource, but do not relate to the thought of the recoverable shared restoration that the alternate routing that proposes among the present invention optimizes.

Summary of the invention

At the defective that exists in the prior art, the object of the present invention is to provide a kind of ASON network to realize the method for the recoverable shared restoration that alternate routing is optimized, recover by in network, implementing recoverable shared formula, can be after shared service turns back to original operating path, under the condition that has the path of more optimizing than current standby LSP, optimize the route of standby LSP.

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

A kind of ASON network is realized the method for the recoverable shared restoration that alternate routing is optimized, and it is characterized in that may further comprise the steps:

Step 1 is set up one and is recovered professional by source node A to the shared formula of destination node C: obtains sharing working LSP path 1, obtain corresponding shared standby LSP path 2;

Step 2 if share working LSP path 1 fault, is then shared standby LSP path 2 and is activated into current shared working LSP path, and under the situation that resource allows, for setting up new shared standby LSP path 3 in current shared working LSP path;

Step 3, if break down again in current shared working LSP path, then share standby LSP path 3 and be activated into current shared working LSP path, and under the situation that resource allows, set up new shared standby LSP path 4 for current shared working LSP path once more;

Step 4, after disposing the fault of sharing on the working LSP path 1, professional turning back to from current shared working LSP path shared working LSP path 1;

Step 5 is calculated the shared standby LSP path of more optimizing for sharing working LSP path 1 again.

ASON network of the present invention is realized the method for the recoverable shared restoration that alternate routing is optimized, recover by in network, implementing recoverable shared formula, can be after shared service turns back to original operating path, under the condition that has the path of more optimizing than current standby LSP, optimize the route of standby 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: business turns back to former working LSP 1;

Fig. 6: on the path of more optimizing, set up new standby LSP;

Embodiment

Below in conjunction with accompanying drawing the present invention is described in further detail.

The present invention proposes a kind of the processing and share the professional method of returning of formula recovery, after shared formula recovery business is returned, under the condition that resource allows, obtain to have the shared standby LSP that more optimizes the path.What specifically, the present invention described is a kind of method that realizes the recoverable shared restoration of standby LSP routing optimality in the ASON network.Our said recoverable shared restoration, be based on a kind of shared recovery implementation of permanent type, that is to say under the condition that resource allows, all the time there is a standby LSP to be associated with current working LSP, under the situation of working LSP fault, standby LSP can be activated, and can build new standby LSP again for the working LSP that is activated.In shared working LSP repeatedly after the fault, when business turned back to original shared working LSP, the route of current shared standby LSP may not be optimized so, and was possible have the route more optimized in the network.Will cause sharing working LSP so once more after the fault, business is not to recover according to the mode of more optimization.

Recoverable shared recovery exactly after business turns back to original operating path, for the current working LSP of returning is created new shared standby LSP, so just can be selected the optimized route except that the working LSP of returning for new shared standby LSP.And, new shared standby set up successfully after, the old shared standby LSP that the deletion route may not optimized relatively.

ASON network then of the present invention is realized the method for the recoverable shared restoration that alternate routing is optimized, and its concrete steps are as follows:

With ASON network topology structure shown in Figure 1 is example, and ASON network of the present invention is realized the method for the recoverable shared restoration that alternate routing is optimized, and its concrete steps are as follows:

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

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

If step 3 is current shared working LSP 2[A, F, C] fault, then Dui Ying standby LSP3[A, B, C] be activated into current working LSP, and set up new shared standby LSP4 for it again, suppose that its path is [A, D, E, C], as shown in Figure 4.Just under the situation that resource allows, current shared working LSP has corresponding shared standby LSP to be associated all the time.

Step 4 is removed original working LSP 1[A, G, C] on fault, business turns back to former working LSP 1, as shown in Figure 5.

Step 5, as shown in Figure 5, current standby LSP path is [A, D, E, C], but also has the path of more optimizing [A, B, C], excludes the path of the former working LSP of returning 1, calculates new standby LSP, uses and optimizes path [A, B, C]; And delete current working LSP and corresponding protection LSP, as shown in Figure 6.

Recover by in network, implementing recoverable shared formula, can after shared service turns back to original operating path, under the condition that has the path of more optimizing than current standby LSP, optimize the route of standby LSP.

Claims

1. an ASON network is realized the method for the recoverable shared restoration that alternate routing is optimized, and it is characterized in that may further comprise the steps: