CN1917412A - Method and device for protecting shared route of fault of double chain - Google Patents
Method and device for protecting shared route of fault of double chain Download PDFInfo
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- CN1917412A CN1917412A CN 200610152140 CN200610152140A CN1917412A CN 1917412 A CN1917412 A CN 1917412A CN 200610152140 CN200610152140 CN 200610152140 CN 200610152140 A CN200610152140 A CN 200610152140A CN 1917412 A CN1917412 A CN 1917412A
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Abstract
With building a working path, a main protective path and a second protective path, all of which are shared same route with the paths of other services, for the current service, the invention allocates the shared wavelength or idle wavelength for the working path, main protective path and second protective path. When the working path failures, firstly, detects the main protective path to decide if there is a failure; if not, the service is switched to the main protective path; if yes, the service is switched to the second protective path. By the invention, when one or two links failure, the service can be recovered in 100%.
Description
Technical field
The present invention relates to a kind of technical field that in optical-fiber network, double-link failure is ensured, specifically a kind of shared path protecting method and device of double-link failure.
Background technology
Along with the quick growth of Internet business, the user is increasing to the demand of the network bandwidth, and existing network has been difficult to satisfy growing needs.The appearance of WDM (Wavelength Division Multiplexing, wavelength division multiplexing) technology makes and can carry tens even hundreds of wavelength channels that on an optical fiber each wavelength channel can reach the speed of gigabit/sec.WDM technology has obtained increasing industry approval and has supported.WDM technology preferably resolves the bandwidth demand on the backbone network, but in traditional point-to-point WDM network, business need be carried out arm and a leg light/electricity/light conversion at each intermediate node place of its process, and this conversion process makes that also channel speed is subject to electronic bottleneck.Wavelength route optical network by OXC (Optical Cross Connect, optical cross connect) forms by the route of wavelength level is provided, very likely becomes the choice of technology of setting up backbone network of future generation.
In wavelength route optical network, the viability of network has been subjected to increasing attention.This mainly is based on following reason: at first, because wavelength route optical network has adopted WDM technology, even therefore single network resource (node device, link) fault may cause that also a plurality of wavelength channels lost efficacy (promptly breaking down, down together), thereby causes the mass data loss; Secondly, along with professional appearance such as ecommerce, video request program, people have proposed more and more higher requirement to the viability of network.At present, the viability of raising wavelength route optical network mainly contains dual mode: resist technology and recovery technology.In these two kinds of technology, each business is all set up two paths: active channel and protection path, generally, come bearer service by active channel, and when active channel lost efficacy, affected business switched to the protection path.Resist technology is just set up active channel and protection path when business arrives, and all reserve wavelength on these two paths, when active channel breaks down, directly business is switched on the protection path and gets final product; And recovery technology begins only to set up active channel; when active channel breaks down, must seek route again, distribute idle wavelength to set up the protection path; if can't set up feasible protection path (owing to finding idle wavelength or suitable situations such as route), then this business can't be recovered.Therefore, compare with recovery technology, though resist technology need to be reserved more wavelength, its have resume speed fast, carry out simple and when single link failure, can guarantee advantage such as 100% recovery.Photosphere is in the bottom of wavelength route network; if the photosphere viability is relatively poor; when photosphere can't recover business; because photosphere has converged a large amount of logical layer business; therefore need recover a large amount of business at logical layer; and possibly can't recover in some cases, so the viability that photosphere need be stronger, and resist technology is more suitable in the viability that improves photosphere.
According to the protection path is certain link of protection whole piece active channel or protection active channel, and resist technology can be divided into trail protection and link protection; Whether can share according to wavelength, resist technology can be divided into share protect and dedicated protection again.Compare with link protection, trail protection needs less wavelength, do not need location of mistake, but recovery time is long slightly; Compare with dedicated protection, share protect can be saved wavelength, be improved the wavelength service efficiency.Share protect is based on the following fact: if two crossing protection paths (two paths are crossing to be meant that their are through certain identical link) can use their common link in no instance simultaneously, then only need to reserve the wavelength of a unit on their common link.For example, under single link failure, if two active channels are non-intersect, and these two active channel corresponding protection paths are crossing, and then these two protection paths can sharing wavelength on their common link.
The viability problem of network has obtained extensive studies, but these research overwhelming majority is based on single link failure.So-called single link failure is meant at any one time to have only a link failure in the network at most.Double-link failure can be regarded as the popularization of single link failure, and it is meant at any one time to have only two link failures at most in the network.Double-link failure situation in the network can not be ignored, main because: (1) only needs several milliseconds to several seconds time though recover an active channel, yet repair the link failure that causes by situations such as optical fiber cut off and need a few hours even a couple of days usually, therefore before a link failure is repaired, the another one link failure takes place probably; (2) one of physical layer section optical fiber may be relevant with the multilink of photosphere, that is to say the multilink fault that one section optical fiber breaks down and may cause photosphere; (3) some key business such as ecommerce, video conference etc. need the service guarantees of higher level, and the viability at networking is had higher requirement, and can not be only limited to the protection to single link failure.The link here all refers to the link of photosphere.
In general, protect double-link failure, just be necessary for each business and set up an active channel and two protection paths.If adopt the trail protection mode, the operating path of same business and protection path must be that link is disjoint.Therefore proprietary trail protection needs more wavelength owing to do not consider sharing of wavelength, causes certain wasting of resources; Share trail protection those the protection paths that can share are only distributed public wavelength, can save the part wavelength like this.In the share protect mode, how to judge whether some protection path can sharing wavelength be a key.
For realizing the share protect under the double-link failure situation; Wensheng He and Arun K.Somani etc. are at " Path-based protection for surviving double-link failures in mesh-restorableoptical networks " (Proc.IEEE GLOBECOM ' 03; 2003; pp.2558-2563) a kind of seven criterions judging whether two crossing protection paths can share are proposed in the literary composition; and with these criterions serve as the basis with the share protect the question resolves itself into optimization problem under the double-link failure situation; try to achieve optimal solution by the use Optimization Software, and promptly know the Wavelength Assignment situation of every link by these optimal solutions.
In suc scheme; when certain bar active channel breaks down; its recovery process is as follows: system (control centre that refers to network) checks at first whether article one protection path of this active channel breaks down; if this protection path has shared resource; check whether shared resource is taken by other protection path on this protection path; have only when article one protection path and do not break down and shared resource on it just uses this protection path to recover professional when unoccupied, otherwise check that second protects path.If second protection path does not break down and the shared resource on it is not used yet, then adopt second protection path to recover professional.If two the protection path all can not use, then or block this business, or other protection path that takies shared resource adjusted.
This method has following shortcoming:
1. 100% recovery assurance can not be provided.Though whether these criterions can judge rightly out independent certain two protection paths can sharing wavelength, because these criterions consider independently that just whether certain two protection path can be shared, and does not consider the relation of influencing each other between many protection paths.When one group of path considering that active channel and corresponding two protection paths form and some are organized path shared; article one protection path of this group can not be used for protecting its active channel; and when considering that this group path and other are organized path shared; article one path of this group must be used for protecting its active channel again; when many active channels lost efficacy simultaneously, recover them simultaneously and just can not like this.For example shown in Figure 1, wherein there are three groups of paths, first group comprises active channel A-B (note is made WP
1) and (note is PP to protect path A-H-B
11), (note is made PP to protection path A-G-B
12); Second group comprises active channel E-D-C (note is made WP
2) and (note is PP to protect path E-A-H-C
21), (note is made PP to protection path E-H-B-C
22); The 3rd group comprises active channel F-E-D (note is made WP
3) and (note is PP to protect path F-A-G-D
31), (note is made PP to protection path F-G-B-D
32).According to the shared rule of prior art, PP
11Can be respectively and PP
21, PP
22Sharing wavelength, PP
12Can be respectively and PP
31, PP
32Sharing wavelength.When link A-B and E-D break down, three active channel WP
1, WP
2And WP
3Lost efficacy in the capital, in order to recover WP simultaneously
1, WP
2, protection path PP
11Can not be used, because if use PP
11Recover WP
1, because WP
2Two protection paths all and PP
11No matter therefore sharing wavelength use PP
21Or PP
22All can with PP
11Produce sharing wavelength and take conflict, thus WP
2Can't be restored), on the other hand, in order to recover WP simultaneously
1, WP
3Must use PP again
11, because PP
12With PP
31, PP
32Sharing wavelength, and PP
31, PP
32In a palpus be used for recovering WP
3, so PP
12Can not use, therefore the share protect path of setting up according to prior art can't recover WP simultaneously
1, WP
2And WP
3
2. judge whether sharable process complexity of protection path.Judging whether two protection paths can be shared needs to share rule with reference to seven, and some rule more complicated also.These complex rule need be calculated just and can reach a conclusion four relevant protection paths.
3. recovery process complexity.Whether this scheme not only needs the check protection path to break down, but also needs to check whether the shared resource on this protection path is occupied.And some the time also need to the protection path of having set up do some adjust could be successful business of recovery.
Also has a kind of permanent 1+1 protection in the prior art; promptly whenever all have only an operating path and a protection path; in operating path, have no progeny; be switched to immediately on the protection path; do not influence the business recovery time like this; and then heavy-route goes out a new protection path and comes out, and guarantees 1+1 protection.
Though the permanent 1+1 protection business recovery time is very fast, it has the shortcoming of following two aspects:
1. it belongs to the privacy protection category, does not realize the resource-sharing of protection interchannel, and resource utilization is low.
2. it is to utilize single-link resist technology (be each working channel any time only reserve a backup channel) to protect multilink fault, can not guarantee 100% recovery.For example; when active channel lost efficacy simultaneously with the protection path; the permanent protection scheme of 1+1 can not provide professional fast and switch; need utilize the residual capacity in the network to attempt route again and distribute wavelength; this rerouting and the long time of process need of distributing wavelength, and might be owing to there not being idling-resource to cause recovering failure.Again for example, when certain active channel broke down in the network, 1+1 protection switched to business on the protection channel of prior reservation, at this moment reattempted and found another protection path.But; successfully find a protection channel to need the time; and some the time since other business taken resource; may be because of there not being idling-resource to can not find other protection path; just the protection path in transport service breaks down if the active channel that loses efficacy this moment is not repaired as yet, and then permanent 1+1 protection also can lose efficacy.
Path with the relation in path is in the literary composition: just become path after having distributed wavelength on the path.
Summary of the invention
In order to solve the problem that prior art can't guarantee 100% recovery business when the double-link failure; the invention provides a kind of shared path protecting method and device of double-link failure; it can make full use of sharing wavelength, with the saving wavelength, and can guarantee 100% recovery business.
The shared path protecting method of double-link failure of the present invention is:
For the business that needs the double-link failure protection is set up operating path, the operating path of described business protects a path in the path that identical route is arranged with other professional main protection paths with inferior, for the described operating path of the business of double-link failure protection that needs distributes idle wavelength;
For the described business of double-link failure protection that needs is set up the main protection path of not having identical route with this professional operating path, there is identical route in the main protection path of described business with a path in other professional operating paths, main protection path and the inferior protection path, is the described main protection path allocation sharing wavelength that needs the business of double-link failure protection;
For the described business of double-link failure protection that needs is set up time protection path of not having identical route with this professional operating path and main protection path; time protection path of described business has identical route with a path in other professional operating paths, main protection path and the inferior protection path, is the described time protection path allocation sharing wavelength that needs the business of double-link failure protection.
For the described operating path that needs the business of double-link failure protection distributes idle wavelength, for the main protection path of the described business that needs the double-link failure protection and the method for inferior protection path allocation sharing wavelength is:
If have available idle wavelength on the operating path of the described business that needs double-link failure protection, should distribute to described operating path by the free time wavelength;
If there is identical route in the described main protection path of the business of double-link failure protection that needs with time protection path of another business, and there is not identical route in the operating path of two business, and assigned wavelength on time protection path of another business is distributed to the described main protection path that needs the business of double-link failure protection;
If there is identical route in the described time protection path of the business of double-link failure protection that needs with another professional main protection path, and there is not identical route in the operating path of two business, and assigned wavelength on another professional main protection path is distributed to the described time protection path that needs the business of double-link failure protection;
If there is identical route in the described time protection path of the business of double-link failure protection that needs with time protection path of another business, and following two conditions satisfy one of them: there is not identical route in the operating path of (1) two business; There is identical route in the operating path of (2) two business, and the described main protection path of the business of double-link failure protection that needs does not exist identical route or described time protection path and another the professional main protection path of the business of double-link failure protection of needing not to have identical route with time protection path of another business; Assigned wavelength on time protection path of another business is distributed to the described time protection path that needs the business of double-link failure protection.
The step of setting up operating path, main protection path and inferior protection path for the described business that needs double-link failure to protect comprises:
A. set up at least one candidate's operating path for described business;
B. corresponding every candidate's operating path is set up at least one and is not had candidate's main protection path of identical route with this operating path;
C. corresponding every candidate's operating path and the combination in candidate's main protection path are set up at least one and are not had the candidate time protection path of identical route with this candidate's operating path and candidate's main protection path;
Described candidate's operating path, candidate's main protection path and candidate time protection path is respectively by the ordering of optimization degree, and wherein optimal path makes number one.
Protect the step of path allocation wavelength to comprise for described candidate's operating path, candidate's main protection path and candidate are inferior:
A. distribute idle wavelength for article one candidate operating path,,, up to being allocated successfully, carry out step b according to this for second candidate operating path distributes idle wavelength if can not be successful; If there is not available idle wavelength in all candidate's main protection paths, abandon this business;
B. be article one candidate's main protection path allocation wavelength that has distributed the operating path of idle wavelength,, be second candidate main protection path allocation wavelength,, carry out step c according to this up to being allocated successfully if unsuccessful; If there is not available wavelength in all candidate's main protection paths, discharge on corresponding candidate's operating path assigned wavelength, return step a, begin to redistribute idle wavelength from back candidate's operating path of this candidate's operating path;
C. be article one time protection path allocation wavelength that has distributed the main protection path of wavelength, if can not be successful, for second time protection path allocation wavelength, according to this up to being allocated successfully; If there is not available wavelength in all candidates time protection path, discharge on the corresponding main protection path assigned wavelength, return step b, begin to redistribute wavelength from back candidate's main protection path in current main protection path.
Among described step b and the step c, at first be described candidate's main protection path or candidate time protection path allocation sharing wavelength,, be described candidate's main protection path or candidate's time idle wavelength of protection path allocation if can not be successful.
Describedly be specially for the method for candidate's main protection path allocation wavelength: will have identical route with described candidate's main protection path and distribute time protection path of other business of wavelength to form time protection set of paths; Protect time protection path institute assigned wavelength in the set of paths to form wavelength set with described time; From described wavelength set, select a wavelength, from described protection set of paths, find out time protection path of other business of distributing this wavelength, judge to distribute this wavelength time protection path can with described candidate's main protection path sharing wavelength, if can, give described candidate's main protection path with this Wavelength Assignment, judge otherwise from described wavelength set, choose another wavelength; If all wavelengths all can not be distributed to described candidate's main protection path in the described wavelength set, be the idle wavelength of described candidate's main protection path allocation.
Described method for candidate's time protection path allocation wavelength is specially: will have identical route with described candidate time protection path and distribute other professional main protection path of wavelength and time protection path to form the protection set of paths; Protection path institute assigned wavelength in the described protection set of paths is formed wavelength set; From described wavelength set, select a wavelength, from described protection set of paths, find out the protection path of distributing this wavelength, judge to distribute this wavelength other business the protection path can with described candidate time protection path sharing wavelength, if can, give described candidate time protection path with this Wavelength Assignment, judge otherwise from described wavelength set, choose another wavelength; If all wavelengths all can not be distributed to described candidate time protection path in the described wavelength set, be the described candidate time idle wavelength of protection path allocation.
When the described operating path that needs the business of double-link failure protection breaks down, at first enable described main protection path and continue this business, when also break down in described main protection path, enable described protection path and continue this business.
The shared trail protection device of double-link failure of the present invention comprises:
Module is set up in the path, being used to needs the business that will carry out of double-link failure protection to set up operating path, main protection path and inferior protection path, and the operating path of described foundation protects the paths in the path that identical route is arranged with other professional main protection paths with inferior; There is identical route in the main protection path of described foundation with a paths in other professional operating paths, main protection path and the inferior protection path; Time protection path of described foundation has identical routed path to set up module when setting up each path for certain business with the paths in other professional operating paths, main protection path and the inferior protection path, allows one of them path to have identical route with a path of other business;
The Wavelength Assignment module is used to and sets up good operating path, main protection path and inferior protection path allocation wavelength.
Described path is set up module and is specifically comprised:
Operating path is set up module, is used to the described business that needs the double-link failure protection to carry out to set up at least one candidate's operating path;
Module is set up in the main protection path, is used to described every candidate's operating path having set up to set up at least one candidate's main protection path;
Module is set up in inferior protection path, is used to described every candidate's main protection path having set up to set up at least one candidate time protection path.
Described Wavelength Assignment module comprises:
Operating path Wavelength Assignment module is used to described candidate's operating path to distribute idle wavelength;
Main protection path Wavelength Assignment module is used to described candidate's main protection path allocation sharing wavelength or idle wavelength;
Inferior protection path Wavelength Assignment module is used to described candidate time protection path allocation sharing wavelength or idle wavelength.
Described main protection path Wavelength Assignment module and time protection path Wavelength Assignment module comprise respectively:
The sharing wavelength distribution module is used to corresponding described candidate's main protection path or candidate time protection path allocation sharing wavelength;
Idle wavelength distribution module is used for when the sharing wavelength distribution module is the failure of respective paths distribution sharing wavelength, is described candidate's main protection path or the candidate time idle wavelength of protection path allocation.
The sharing wavelength distribution module of the sharing wavelength distribution module of described main protection path Wavelength Assignment module and idle wavelength distribution module, inferior protection path Wavelength Assignment module and idle wavelength distribution module and operating path Wavelength Assignment module comprise respectively:
Select module, be used to select a wavelength;
Judge module is used for judging by selecting the selected wavelength of module whether to allow to distribute to corresponding path.
Described device also comprises order module, is used for protecting the path of set of paths or described protection set of paths to carry out Sorted list by the path of the inferior protection of extremely big or arrogant extremely little candidate's operating path, candidate's main protection path and candidate from childhood by the order of optimization degree to described time.
The beneficial effect that the present invention produces is:
1. the present invention always specifies the main protection path preferentially to use; if shared resource takies conflict; only may occur between main protection path and time protection path and between inferior protection path and the inferior protection path; so just avoided when considering that this group path and some are organized path shared; article one protection path of this group can not be used for protecting its active channel; and when considering that this group path and other are organized path shared; article one path of this group must be used for protecting the possibility of the inconsistency of its active channel again; therefore, the present invention can provide 100% assurance recovery business.
2. make protection path sharing wavelength as much as possible, thus the aggregate resource demand of saving network, and perhaps under the certain situation of the aggregate resource demand of network, carrying is more professional.
3. simplified recovery process, recovery process fast, simply.When source node monitors active channel when breaking down; by monitoring and controlling channels information; check whether the main protection path breaks down; if the main protection path does not break down, source node switches to the main protection path with business, if the main protection path also breaks down; then be directly switch to time protection path; do not need to monitor time protection path in the recovery process, because under the prerequisite of double-link failure, three disjoint paths can not lose efficacy simultaneously.Whether the sharing wavelength that recovery process also need not detect between the protection path is occupied, also need not adjust the protection path of having set up.
4. applied widely.The present invention also can be used for the network of other type except that can be used for wavelength route optical network, for example TDM (Time Division Multiplexing, time division multiplexing) network, wavelet long channel network etc.The present invention promptly can be used for static traffic and also can be used for dynamic service, both can be used for optimal algorithm and also can be used for heuritic approach, both can be used for having the network of wavelength conversion capability, also can be used for not having the network of wavelength conversion capability.
Description of drawings
Fig. 1 is the schematic diagram of the embodiment in a kind of operating path of setting up according to prior art in network and protection path.
Fig. 2 is the flow chart of the shared path protecting method of double-link failure of the present invention.
Fig. 3 is the flow chart of a kind of embodiment of the shared path protecting method of double-link failure of the present invention.
Fig. 4 is a flow chart of setting up a kind of specific embodiment in operating path, main protection path and inferior protection path.
Fig. 5 is the flow chart for operating path, main protection path and a kind of specific embodiment of inferior protection path allocation wavelength.
Fig. 6 is the flow chart of the restoration methods taked when active channel breaks down.
Fig. 7 is the schematic diagram in operating path, main protection path and time protection path of a kind of specific embodiment of the present invention.
Fig. 8 is the structural principle block diagram of the shared trail protection device of double-link failure of the present invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples, but not as a limitation of the invention.
As shown in Figure 2, the method for the shared trail protection of double-link failure of the present invention may further comprise the steps:
Step 201: for the business foundation that needs the double-link failure protection protects one in the path the identical route operating path of (intersecting) is arranged with other professional main protection paths with inferior;
Step 202: for the operating path of setting up in the step 201 distributes idle wavelength;
Step 203.: for the business that needs double-link failure protection set up with other professional operating paths, main protection path and inferior protection path in a main protection path that identical route (intersecting) is arranged, and this main protection path with do not have identical route with its operating path that belongs to same business;
Step 204: be the main protection path allocation sharing wavelength of setting up in the step 203;
Step 205: for the business that needs double-link failure protection set up with other professional operating paths, main protection path and inferior protection path in one identical route (intersecting) arranged time protect the path, and this time protected the path and do not had identical route with its operating path, main protection path that belongs to same business;
Step 206: be time protection path allocation sharing wavelength of setting up in the step 205.
A kind of specific embodiment of shared path protecting method of double-link failure comprises as shown in Figure 3:
Step 301: for the current business that will carry out is set up mutually disjoint operating path, main protection path and inferior protection path;
Step 302: for the operating path of setting up distributes idle wavelength;
Step 303: can judgement be the main protection path allocation sharing wavelength of setting up, if can, carry out step 304; If can not, carry out step 305;
Step 304:, carry out step 306 for the main protection path allocation sharing wavelength of setting up;
Step 305:, carry out step 306 for the idle wavelength of the main protection path allocation of setting up;
Step 306: can judgement be time protection path allocation sharing wavelength of setting up, if can, carry out step 307; If can not, carry out step 308;
Step 307: be time protection path allocation sharing wavelength of setting up, task termination.
Step 308: be time idle wavelength of setting up of protection path allocation, task termination.
More specifically a kind of method of setting up operating path, main protection path and inferior protection path is as shown in Figure 4:
Step 401: from network topology, choose the K1 paths as candidate's operating path, and these paths are sorted by the optimization degree, wherein Zui You path comes the foremost, the optimization degree can be considered factors such as the shortest, the minimum hop rate in path, congestion ratio be minimum separately, also can take all factors into consideration these several factors;
Step 402: set up K2 bar candidate main protection path for every candidate's operating path setting up in the step 401 from network topology, candidate's main protection path candidate operating path corresponding with it can not intersect; Sorted by the optimization degree in the K2 bar candidate main protection path of every candidate's operating path correspondence, wherein Zui You path comes the foremost, the optimization degree can be considered factors such as the shortest, the minimum hop rate in path, congestion ratio be minimum separately, also can take all factors into consideration these several factors;
Step 403: set up K3 bar candidate time protection path for every candidate's main protection path setting up in the step 402 from network topology, the candidate can not be intersected in time protection candidate's operating path and candidate's main protection path corresponding with it, path; Sorted by the optimization degree in the K3 bar candidate time protection path of every candidate's main protection path correspondence, wherein Zui You path comes the foremost, the optimization degree can be considered factors such as the shortest, the minimum hop rate in path, congestion ratio be minimum separately, also can take all factors into consideration these several factors;
K1 in the above-mentioned several steps, K2 and K3 can carry out value as required, can be 1 or than 1 big integer.
For the method for the candidate's operating path, candidate's main protection path and the candidate that set up time protection path allocation wavelength as shown in Figure 5, wherein the initial value of i, m and n all is 1, specifically describes as follows:
Step 501: can judgement distribute idle wavelength for i bar (initial value of i is 1) candidate's operating path, if can, carry out step 505; If can not, carry out step 502;
Step 502: judge whether all selected mistake of all candidate's operating paths, judge promptly whether the i value equals the total number K1 of candidate's operating path, if carry out step 503; If not, carry out step 504;
Step 503: abandon current business, task termination.
Step 504: the value of i is added 1, return step 501, promptly attempt making the idle wavelength of path allocation for next bar candidate;
Step 505: for selected candidate's operating path distributes idle wavelength, this selects operating path to become the active channel of current business, carry out step 506;
Step 506: can judgement for corresponding to m bar (initial value of m is 1) candidate's main protection path allocation sharing wavelength in candidate's main protection path of that operating path that has distributed idle wavelength, if can, carry out step 507; If can not, carry out step 508;
Step 507: be selected candidate's main protection path allocation sharing wavelength, this candidate's main protection path becomes the main protection path of current business, carry out step 512;
Step 508: can judgement be the idle wavelength of m bar candidate main protection path allocation, if can, carry out step 511; If can not, carry out step 509;
Step 509: judge whether all selected mistake in all candidate's main protection paths, judge promptly whether the m value equals the total number K2 in candidate's main protection path, if, discharge on the active channel assigned wavelength, return step 502; If not, carry out step 510;
Step 510: the value of m is added 1, return step 506, promptly attempt being next bar candidate main protection path allocation sharing wavelength;
Step 511: be the idle wavelength of selected candidate's main protection path allocation, this candidate's main protection path becomes the main protection path of current business, carry out step 512;
Step 512: can judgement for corresponding to n bar (initial value of n is 1) candidate in the main protection path of having distributed wavelength time protection path allocation sharing wavelength, if can, carry out step 513; If can not, carry out step 514;
Step 513: be selected candidate time protection path allocation sharing wavelength, this candidate time protection path becomes the inferior protection path of current business, task termination.
Step 514: can judgement be the n bar candidate time idle wavelength of protection path allocation, if can, carry out step 517; If can not, carry out step 515;
Step 515: judge whether all selected mistake in all candidates time protection path, judge promptly whether n value equals the total number K3 that the candidate time protects the path, if, discharge on its corresponding main protection path assigned wavelength, return step 509; If not, carry out step 516;
Step 516: the value of n is added 1, return step 512, promptly attempt time protection path allocation sharing wavelength for next bar candidate;
Step 517: be the selected candidate time idle wavelength of protection path allocation, this candidate time protection path becomes the inferior protection path of current business, task termination.
In said process, judging whether to be for the individual process of candidate's main protection path allocation sharing wavelength of wavelength to be allocated: is undertaken from childhood sorting to big order by intersecting chain way order in time protection path of other business that will intersect with candidate's main protection path link of wavelength to be allocated, form time protection set of paths, the wavelength set of a sky is set, successively time protection path institute assigned wavelength in the inferior protection set of paths is added in the wavelength set, if this wavelength exists, do not repeat to add, after treating that all wavelengths adds wavelength set to, from this wavelength set, choose a wavelength, if distributed the operating path of the operating path of business of this wavelength and current business non-intersect, judged result is a "Yes"; Otherwise choose another wavelength, if all wavelengths is all selected in the wavelength set, judged result is a "No".
Judging whether to be for the concrete grammar of the candidate of wavelength to be allocated time protection path allocation sharing wavelength: is undertaken from childhood sorting to big order by intersecting chain way order in the protection path of the candidate of wavelength to be allocated time other business that the protection path link intersects (comprising main protection path and time protection path), form the protection set of paths, the wavelength set of a sky is set, successively the protection path institute assigned wavelength in the protection set of paths is added in the wavelength set, if this wavelength exists, do not repeat to add, after treating that all wavelength add wavelength set to, from this wavelength set, choose a wavelength, if what distribute this wavelength is other professional main protection path, and the operating path of operating path that should business and current business is non-intersect, then judged result is a "Yes", otherwise judged result is a "No"; If distribute this wavelength be other business time protect the path, it is non-intersect that (1) distributes the operating path of the operating path of business of this wavelength and current business when satisfying one of following condition; (2) if distribute the operating path of business of this wavelength and the operating path of current business to intersect; and time protection path of the main protection path of current business and another business time protection path and another professional main protection path non-intersect or current business are non-intersect; judged result is a "Yes"; otherwise choose another wavelength; if all wavelengths is all selected in the wavelength set, judged result is a "No".
In the process that is candidate's main protection path and candidate time protection path allocation wavelength; also can attempt being each group candidate main protection path and candidate's time protection path allocation sharing wavelength earlier; if all candidate's main protection paths or candidate can not distribute sharing wavelength in time protection path in one group; reattempt to they distribute idle wavelength; be article one candidate main protection path allocation sharing wavelength earlier promptly; if cannot be second candidate main protection path allocation sharing wavelength again; if sharing wavelength all can not be distributed in all candidate's main protection paths; attempt being the idle wavelength of article one candidate main protection path allocation; be the idle wavelength of second candidate main protection path allocation if cannot reattempt; and the like, all distribute failure up to successful all candidate's main protection paths.Protect path allocation similar for the candidate is inferior.
When the active channel of certain task broke down, the restoration methods of taking was described below as shown in Figure 6:
Step 601: judge whether this professional main protection path breaks down, if do not break down execution in step 602, if group's barrier execution in step 603 has also taken place the main protection path;
Step 602: business is switched to the main protection path.
Step 603: business is switched to time protection path.
Be illustrated with specific embodiment below:
As shown in Figure 7, this network need be carried out three business, and three business are respectively between node A and the Node B, carry out between node F and node D, node E and the node C.
Because the present networks topology is simple relatively; therefore establish K1=K2=K3=1; be each business and only set up candidate's operating path, candidate's main protection path and a candidate time protection path; and when selecting the path, only consider the factor that the path is the shortest; when needing to consider other factors, utilize corresponding algorithm to calculate and get final product.
Embodiment one: for the business between joint A and the Node B (being made as professional) is set up active channel and protection path.
(1) in network topology, select a path A-B the shortest as this professional candidate's operating path;
(2) in network topology, remove link A-B, in remaining link, select a shortest paths as this professional candidate's main protection path, there are two the shortest path: A-G-B and A-H-B in the network, select one at random as candidate's main protection path, supposed to select the main protection path of A-H-B as business one;
(3) in network topology, remove link A-B, A-H and H-B, in remaining link, select a shortest paths A-G-B as this professional candidate time protection path;
(4) distribute idle wavelength for candidate's operating path A-B, supposing to have distributed wavelength is λ
1Wavelength, candidate's operating path A-B becomes professional one active channel;
(5) be that candidate's main protection path A-H-B distributes wavelength, because do not have in the network and other crossing path of this candidate's main protection path this moment, therefore distribute idle wavelength for candidate's main protection path A-H-B, supposing to have distributed wavelength is λ
2Wavelength, candidate's main protection path A-H-B becomes professional one main protection path;
(6) being that candidate time protection path A-G-B distributes wavelength, owing to there not being time other crossing path of protection path with this candidate this moment in the network, therefore is that candidate time protection path A-H-B distributes idle wavelength, and supposing to have distributed wavelength is λ
3Wavelength, candidate time protection path A-H-B becomes professional one inferior protection path.
Embodiment two: for the business between joint E and the node C (being made as professional two) is set up active channel and protection path.
(1) in network topology, select a path the shortest as this professional candidate's operating path, there are two the shortest path: E-D-C and E-H-C in the network, select one at random as candidate's operating path, supposed to select the candidate operating path of E-D-C as business two;
(2) in network topology, remove link E-D and D-C, in remaining link, select the candidate main protection path of a shortest paths E-H-C as business two;
(3) in network topology, remove link E-D, D-C, E-H and H-C, in remaining link, select a shortest paths E-A-B-C as the inferior path of protecting of professional two candidate;
(4) distribute idle wavelength for candidate's operating path E-D-C, supposing to have distributed wavelength is λ
4Wavelength, candidate's operating path E-D-C becomes professional two active channel;
(5) be that candidate's main protection path E-H-C distributes wavelength, because do not have in the network and other crossing path of this candidate's main protection path this moment, therefore distribute idle wavelength for candidate's main protection path E-H-C, supposing to have distributed wavelength is λ
5Wavelength, candidate's main protection path E-H-C becomes professional two main protection path;
(6) be that candidate time protection path E-A-B-C distributes wavelength; with this candidate time crossing operating path A-B that has only business one in protection path; and operating path can not with other path sharing wavelength; promptly professional one operating path A-B can not be gone up assigned wavelength reallocates to candidate time protection path E-A-B-C; distribute idle wavelength therefore for professional two candidate time protection path E-A-B-C, supposing to have distributed wavelength is λ
6Wavelength, inferior protection path E-A-B-C becomes professional two inferior protection path.
Embodiment three: for the business between joint F and the node D (being made as professional three) is set up active channel and protection path.
(1) in network topology, selects the candidate operating path of a path the shortest as business three, there are two the shortest path: F-E-D and F-G-D in the network, select one at random as candidate's operating path, supposed to select the candidate operating path of F-E-D as business three;
(2) in network, remove link F-E and E-D, in remaining link, select the candidate main protection path of a shortest paths F-G-D as business three;
(3) in network topology, remove link F-E, E-D, F-G and G-D, in remaining link, select a shortest paths F-A-B-D as the inferior path of protecting of professional three candidate;
(4) distribute idle wavelength for candidate's operating path F-E-D, supposing to have distributed wavelength is λ
7Wavelength, candidate's operating path F-E-D becomes professional three active channel;
(5) be that candidate's main protection path F-G-D distributes wavelength, because do not have in the network and other crossing path of this candidate's main protection path this moment, therefore distribute idle wavelength for candidate's main protection path F-G-D, supposing to have distributed wavelength is λ
8Wavelength, main protection path F-G-D becomes professional three main protection path;
(6) be that candidate time protection path F-A-B-D distributes wavelength; with intersect in this candidate time protection path professional one operating path A-B and professional two time protection path E-A-B-C arranged, professional one operating path A-B goes up and professional two time protection path E-A-B-C to go up that assigned wavelength distributes be λ
1And λ
6, since operating path can not with other path sharing wavelength, so wavelength X
1Can not distribute to candidate time protection path F-A-B-D; Because professional two operating path E-D-C and candidate's operating path F-E-D of business three intersect (link E-D); and the inferior protection path E-A-B-C of the main protection path E-H-C of business two and professional three candidate time protection path F-A-B-D, business two is non-intersect with candidate's main protection path F-G-D of professional three; so professional two time protection path E-A-B-C and professional three candidate time protection path F-A-B-D can sharing wavelength; therefore, divide λ with professional two time last assigned wavelength of protection path E-A-B-C
6The candidate of dispensing business three time protection path F-A-B-D, candidate time protection path F-A-B-D becomes professional three inferior protection path.
Configuration through top three embodiment; in network, be respectively three business and set up active channel, main protection path and inferior protection path; if wherein certain professional active channel breaks down; whether detect this professional main protection path breaks down; if do not have; business is switched on the main protection path; if fault has also taken place in the main protection path; directly business is switched on time protection path; whether break down and need not detect time protection path; because under the prerequisite of double-link failure, three disjoint links can not lose efficacy simultaneously.With respect to prior art, whether the sharing wavelength that need not detect between the protection path is occupied, more need not adjust the protection path of having set up.
For example link A-B and link E-D break down simultaneously; then cause the active channel of three business to interrupt simultaneously; at this moment; business one, professional two and professional three is changed to corresponding main protection path A-H-B, E-H-C and F-G-D respectively; three business can be recovered, and can not cause situation about can't recover.
When other any two link occurs fault, three business can be recovered, and this problem is described below from the negative.
According to the present invention; if shared resource takies conflict; then only may occur between main protection path and time protection path and between inferior protection path and time protection path; suppose that professional one the main protection path and the inferior protection path of business two sharing wavelength occurs and take and conflict; because when having only professional two active channel and main protection path all to break down; just can use and secondly protect path; so taking conflict, this shared resource means professional one active channel; fault has all appearred in professional two active channel and main protection path; and under the situation of double-link failure; this means that again professional one active channel is crossing with professional two active channel or main protection path; according to technical scheme of the present invention; professional one main protection path and professional two time protection path can not sharing wavelength, therefore also the situation that sharing wavelength takies conflict can not occur.Other situation can obtain proof in the same way, and therefore technical scheme of the present invention can not cause taking the situation that conflict can't recover because of sharing wavelength.
As shown in Figure 8, the shared trail protection device of double-link failure of the present invention comprises with lower module:
Operating path is set up module 802, and being used for choosing link from network is that pending business is set up at least one candidate's operating path, and candidate's operating path of being set up protects the paths in the path that identical route is arranged with other professional main protection roads with inferior;
Operating path Wavelength Assignment module 806, good candidate's operating path distributes idle wavelength to be used to foundation;
Main protection path Wavelength Assignment module 807 is used to candidate's main protection path allocation sharing wavelength or idle wavelength;
Inferior protection path Wavelength Assignment module 808 is used to candidate time protection path allocation sharing wavelength or idle wavelength;
In above-mentioned each module; operating path is set up module 802, main protection path and is set up module 803 and inferior protection path and set up module 804 and form paths and set up module 801, and operating path Wavelength Assignment module 806, main protection path Wavelength Assignment module 807, inferior protection path Wavelength Assignment module 808 and order module 809 are formed Wavelength Assignment modules 805.Wherein main protection path Wavelength Assignment module 807 and time protection path Wavelength Assignment module 808 are made of sharing wavelength distribution module and idle wavelength distribution module respectively; and sharing wavelength distribution module and idle wavelength distribution module are made of selection module and judge module respectively, and operating path Wavelength Assignment module is also by selecting module and judge module to constitute.
Claims (14)
1, a kind of shared path protecting method of double-link failure is characterized in that, described method is:
For the business that needs the double-link failure protection is set up operating path, the operating path of described business protects a path in the path that identical route is arranged with other professional main protection paths with inferior, for the described operating path of the business of double-link failure protection that needs distributes idle wavelength;
For the described business of double-link failure protection that needs is set up the main protection path of not having identical route with this professional operating path, there is identical route in the main protection path of described business with a path in other professional operating paths, main protection path and the inferior protection path, is the described main protection path allocation sharing wavelength that needs the business of double-link failure protection;
For the described business of double-link failure protection that needs is set up time protection path of not having identical route with this professional operating path and main protection path; time protection path of described business has identical route with a path in other professional operating paths, main protection path and the inferior protection path, is the described time protection path allocation sharing wavelength that needs the business of double-link failure protection.
2, the shared path protecting method of double-link failure according to claim 1; it is characterized in that, for the described operating path that needs the business of double-link failure protection distributes idle wavelength, for the main protection path of the described business that needs the double-link failure protection and the method for inferior protection path allocation sharing wavelength is:
If have available idle wavelength on the operating path of the described business that needs double-link failure protection, should distribute to described operating path by the free time wavelength;
If there is identical route in the described main protection path of the business of double-link failure protection that needs with time protection path of another business, and there is not identical route in the operating path of two business, and assigned wavelength on time protection path of another business is distributed to the described main protection path that needs the business of double-link failure protection;
If there is identical route in the described time protection path of the business of double-link failure protection that needs with another professional main protection path, and there is not identical route in the operating path of two business, and assigned wavelength on another professional main protection path is distributed to the described time protection path that needs the business of double-link failure protection;
If there is identical route in the described time protection path of the business of double-link failure protection that needs with time protection path of another business, and following two conditions satisfy one of them: there is not identical route in the operating path of (1) two business; There is identical route in the operating path of (2) two business, and the described main protection path of the business of double-link failure protection that needs does not exist identical route or described time protection path and another the professional main protection path of the business of double-link failure protection of needing not to have identical route with time protection path of another business; Assigned wavelength on time protection path of another business is distributed to the described time protection path that needs the business of double-link failure protection.
3, the shared path protecting method of double-link failure according to claim 1 is characterized in that, the step of setting up operating path, main protection path and inferior protection path for the described business that needs double-link failure to protect comprises:
A. set up at least one candidate's operating path for described business;
B. corresponding every candidate's operating path is set up at least one and is not had candidate's main protection path of identical route with this operating path;
C. corresponding every candidate's operating path and the combination in candidate's main protection path are set up at least one and are not had the candidate time protection path of identical route with this candidate's operating path and candidate's main protection path;
Described candidate's operating path, candidate's main protection path and candidate time protection path is respectively by the ordering of optimization degree, and wherein optimal path makes number one.
4, the shared path protecting method of double-link failure according to claim 3 is characterized in that, protects the step of path allocation wavelength to comprise for described candidate's operating path, candidate's main protection path and candidate are inferior:
A. distribute idle wavelength for article one candidate operating path,,, up to being allocated successfully, carry out step b according to this for second candidate operating path distributes idle wavelength if can not be successful; If there is not available idle wavelength in all candidate's main protection paths, abandon this business;
B. be article one candidate's main protection path allocation wavelength that has distributed the operating path of idle wavelength,, be second candidate main protection path allocation wavelength,, carry out step c according to this up to being allocated successfully if unsuccessful; If there is not available wavelength in all candidate's main protection paths, discharge on corresponding candidate's operating path assigned wavelength, return step a, begin to redistribute idle wavelength from back candidate's operating path of this candidate's operating path;
C. be article one time protection path allocation wavelength that has distributed the main protection path of wavelength, if can not be successful, for second time protection path allocation wavelength, according to this up to being allocated successfully; If there is not available wavelength in all candidates time protection path, discharge on the corresponding main protection path assigned wavelength, return step b, begin to redistribute wavelength from back candidate's main protection path in current main protection path.
5, the shared path protecting method of double-link failure according to claim 4; it is characterized in that; among described step b and the step c; it at first is described candidate's main protection path or candidate time protection path allocation sharing wavelength; if can not be successful, be described candidate's main protection path or candidate's time idle wavelength of protection path allocation.
6, the shared path protecting method of double-link failure according to claim 4, it is characterized in that, describedly be specially for the method for candidate's main protection path allocation wavelength: will have identical route with described candidate's main protection path and distribute time protection path of other business of wavelength to form time protection set of paths; Protect time protection path institute assigned wavelength in the set of paths to form wavelength set with described time; From described wavelength set, select a wavelength, from described protection set of paths, find out time protection path of other business of distributing this wavelength, judge to distribute this wavelength time protection path can with described candidate's main protection path sharing wavelength, if can, give described candidate's main protection path with this Wavelength Assignment, judge otherwise from described wavelength set, choose another wavelength; If all wavelengths all can not be distributed to described candidate's main protection path in the described wavelength set, be the idle wavelength of described candidate's main protection path allocation.
7, the shared path protecting method of double-link failure according to claim 4, it is characterized in that described method for candidate's time protection path allocation wavelength is specially: will have identical route with described candidate time protection path and distribute other professional main protection path of wavelength and time protection path to form the protection set of paths; Protection path institute assigned wavelength in the described protection set of paths is formed wavelength set; From described wavelength set, select a wavelength, from described protection set of paths, find out the protection path of distributing this wavelength, judge to distribute this wavelength other business the protection path can with described candidate time protection path sharing wavelength, if can, give described candidate time protection path with this Wavelength Assignment, judge otherwise from described wavelength set, choose another wavelength; If all wavelengths all can not be distributed to described candidate time protection path in the described wavelength set, be the described candidate time idle wavelength of protection path allocation.
8, according to the method for the shared trail protection of any described double-link failure of claim of claim 1 to 7; it is characterized in that; when the described operating path that needs the business of double-link failure protection breaks down; at first enable described main protection path and continue this business; when also break down in described main protection path, enable described protection path and continue this business.
9, a kind of shared trail protection device of double-link failure is characterized in that described device comprises:
Module is set up in the path, and being used to needs the business of double-link failure protection to set up operating path, main protection path and inferior protection path, and the operating path of described foundation protects the paths in the path that identical route is arranged with other professional main protection paths with inferior; There is identical route in the main protection path of described foundation with a paths in other professional operating paths, main protection path and the inferior protection path; There is identical route in time protection path of described foundation with the paths in other professional operating paths, main protection path and the inferior protection path;
The Wavelength Assignment module is used to and sets up good operating path, main protection path and inferior protection path allocation wavelength.
10, the shared trail protection device of double-link failure according to claim 9 is characterized in that, described path is set up module and specifically comprised:
Operating path is set up module, is used to the described business of double-link failure protection that needs to set up at least one candidate's operating path;
Module is set up in the main protection path, is used to described every candidate's operating path having set up to set up at least one candidate's main protection path;
Module is set up in inferior protection path, is used to described every candidate's main protection path having set up to set up at least one candidate time protection path.
11, the shared trail protection device of double-link failure according to claim 8 is characterized in that, described Wavelength Assignment module comprises:
Operating path Wavelength Assignment module is used to described candidate's operating path to distribute idle wavelength;
Main protection path Wavelength Assignment module is used to described candidate's main protection path allocation sharing wavelength or idle wavelength;
Inferior protection path Wavelength Assignment module is used to described candidate time protection path allocation sharing wavelength or idle wavelength.
12, the shared trail protection device of double-link failure according to claim 11 is characterized in that, described main protection path Wavelength Assignment module and time protection path Wavelength Assignment module comprise respectively:
The sharing wavelength distribution module is used to described candidate's main protection path or candidate time protection path allocation sharing wavelength;
Idle wavelength distribution module is used for when the sharing wavelength distribution module is the failure of respective paths distribution sharing wavelength, is described candidate's main protection path or the candidate time idle wavelength of protection path allocation.
13, the shared trail protection device of double-link failure according to claim 12; it is characterized in that the sharing wavelength distribution module of the sharing wavelength distribution module of described main protection path Wavelength Assignment module and idle wavelength distribution module, inferior protection path Wavelength Assignment module and idle wavelength distribution module and operating path Wavelength Assignment module comprise respectively:
Select module, be used to select a wavelength;
Judge module is used for judging by selecting the selected wavelength of module whether to allow to distribute to corresponding path.
14, according to the shared trail protection device of claim 11,12 or 13 described double-link failures; it is characterized in that; described device also comprises order module, is used for being sorted by the optimization degree in described candidate's operating path, candidate's main protection path and candidate time protection path.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101287009B (en) * | 2008-06-05 | 2011-07-13 | 中兴通讯股份有限公司 | Method and apparatus for configuring static pre-configuration cycle under double link fault |
| CN102185650A (en) * | 2011-06-09 | 2011-09-14 | 国网电力科学研究院 | Disjoint path-based ASON (Automatic Switched Optical Network) multiple fault protection method |
| CN106789634A (en) * | 2016-11-17 | 2017-05-31 | 深圳市深信服电子科技有限公司 | Static routing management method and system based on the double primary climates of link load |
| CN109005030A (en) * | 2018-07-13 | 2018-12-14 | 北京邮电大学 | The guard method and system of key business in a kind of quantum network |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2254606C (en) * | 1997-11-28 | 2003-06-17 | Nec Corporation | Ring network for sharing protection resource by working communication paths |
| US6512611B1 (en) * | 1999-12-23 | 2003-01-28 | Nortel Networks Limited | Method of deactivating protection fiber resources in optical ring networks |
| US7433966B2 (en) * | 2002-01-02 | 2008-10-07 | Cisco Technology, Inc. | Implicit shared bandwidth protection for fast reroute |
| EP1343262B1 (en) * | 2002-03-08 | 2005-12-21 | Alcatel | A method of restoring a facility failure in a communication network consisting of rings, a correpsonding communication network and network element |
| CN100508439C (en) * | 2004-06-24 | 2009-07-01 | 华为技术有限公司 | Light channel shared protection control and its controller |
-
2006
- 2006-09-14 CN CN200610152140A patent/CN100578993C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101287009B (en) * | 2008-06-05 | 2011-07-13 | 中兴通讯股份有限公司 | Method and apparatus for configuring static pre-configuration cycle under double link fault |
| CN102185650A (en) * | 2011-06-09 | 2011-09-14 | 国网电力科学研究院 | Disjoint path-based ASON (Automatic Switched Optical Network) multiple fault protection method |
| CN106789634A (en) * | 2016-11-17 | 2017-05-31 | 深圳市深信服电子科技有限公司 | Static routing management method and system based on the double primary climates of link load |
| CN106789634B (en) * | 2016-11-17 | 2020-06-26 | 深信服科技股份有限公司 | Static route management method and system based on link load dual-main environment |
| CN109005030A (en) * | 2018-07-13 | 2018-12-14 | 北京邮电大学 | The guard method and system of key business in a kind of quantum network |
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