CN102355608B - Improved method for fault recovery of multi-granularity optical network based on GMPLS - Google Patents
Improved method for fault recovery of multi-granularity optical network based on GMPLS Download PDFInfo
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- CN102355608B CN102355608B CN 201110181584 CN201110181584A CN102355608B CN 102355608 B CN102355608 B CN 102355608B CN 201110181584 CN201110181584 CN 201110181584 CN 201110181584 A CN201110181584 A CN 201110181584A CN 102355608 B CN102355608 B CN 102355608B
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Abstract
The invention, which belongs to the optical communication and intelligent optical network field, discloses an improved method for fault recovery of a multi-granularity optical network based on a GMPLS. According to the method, on the basis of a message mechanism and a shared backup recovery strategy of GMPLS survivability, fault type are determined at a fault source node; and the fault source node respectively recovers faults according to the fault types. Moreover, according to the invention, a resource utilization rate is high in an optical network environment with high complexity; a needed number of network node ports is small, so that costs are reduced.
Description
Technical field
The present invention relates to the multiple size light network failure recovery method of a kind of improved GMPLS, belong to optical communication, ASON field.
Background technology
The basic protocol stack architecture of multiprotocol label switching (mpls) and main characteristic have been inherited in GMPLS (GMPLS), and support multiple new switching fabric type, comprise wavelength level, wavestrip level and the exchange of optical fiber level etc.GMPLS will comprise that time slot, wavelength, wavestrip and fiber port carry out data retransmission as label, and carry out dynamic control and management by the signaling, Routing Protocol and the new link management mechanism that adopt expansion.For the situation that adapts to multiple granularity service in the following optical-fiber network and deposit, introduced the intelligent multiple size light network (MGON) based on the control plane technology of GMPLS, realize optical network resource is dynamically controlled and transmitted the requirement of signaling, strengthened survivability at resource and professional Dynamic Discovery with when providing Internet resources flexibly.
From network failure type angle, MGON compares traditional optical-fiber network has increased the situation that wavestrip lost efficacy.The possible cause that wavestrip lost efficacy comprises what wavestrip cross-connect in the node, wavestrip multiplexing demultiplexing device (or fibre junction point place) and wavestrip converter fault caused.At this moment, the one or more wavestrips in the optical fiber can be affected and cause blocking, but whole optical fiber can not be affected.From the network failure Restoration Mechanism, owing to increased the failure conditions of wave band channel newly, therefore need to consider and formulate the strategy that carries out fault recovery based on wave band channel.
For the multiple size light network survivability problem of supporting traffic grooming (TrafficGrooming) ability, the solution that has proposed comprises:
Method one: Shared-path protection; comprise based on the share protect strategy (SPPB) in wavestrip path and based on the share protect strategy (SPPL) of light path [Guo Lin. be applicable to share protect algorithm and the analysis [J] thereof of multiple size light network. the photon journal; in April, 2009,38(04): 847-851].In the SPPB strategy; article one, path channels (lightpath) will be through one or more shielded wave band channel (bandpath); namely for each operating wave tape channel (bandpath) of having set up, all need to reserve resource backup at corresponding Protection path.Every work lightpath in the SPPL strategy has the lightpath of a protection, and namely the granularity of protection is wavelength level.But in optical-fiber network; adopt this protected mode higher to node and internodal annexation requirement, thus generally be only applicable to the transmission system of point-to-point, in large-scale complex network; owing to be subject to the constraint of network topology and wavelength connection consistency, be difficult to direct employing.
Method two: rerouting recovering.[Lv Wei. the traffic grooming of multiple size light network and associating survivability [D]. the .2006:36-41 of Beijing University of Post ﹠ Telecommunication].In this kind method, when setting up wavestrip, need to be responsible for processing the node (generally being made as the wavestrip source node) of wavestrip fault recovery and determine that this wavestrip is to adopt wavelength or the restoration methods of wavestrip by message announcement, and preserve fault recovery method at the wavestrip source node.After node detected fault and fault location, at first notice was responsible for the node (source node) of wavestrip fault recovery, judged at this node and the fault recovery method of this fault calculated and set up faulty channel for subsequent use by this node, removed faulty channel.The shortcoming of this method is that the idling-resource in the network is fewer and feweri along with traffic carrying capacity increases, and for the rerouting recovering of not reserving resource, other recovers various levels to be difficult to all be met.Therefore, when traffic load was heavier in the network, it was lower to revert to power.
In sum, existing MGON protection recovery policy does not take into full account the network factors such as network resource utilization, network node port cost and traffic carrying capacity mainly for link failure.Along with the quick raising of topological complexity and the traffic carrying capacity of optical-fiber network, existing method can't satisfy the protection that realizes the complicated optical-fiber networks of many granularities and the demand of recovery.
Summary of the invention
Technical problem to be solved by this invention is the deficiency for the above-mentioned background technology, and the multiple size light network failure recovery method of a kind of improved GMPLS is provided.After fault localization mechanism was determined many granularities node failure to occur in the network, the node of being responsible for recovering restarted the traffic grooming strategy and recovers passage for make wavestrip of path computation through affected this subwave of failure node farm labourer.This method has reduced the port cost, shared resource has improved the whole survivability of network.
The present invention adopts following technical scheme for achieving the above object:
The multiple size light network failure recovery method of a kind of improved GMPLS comprises the steps:
Step 2, optical-fiber network source node link control module read every precalculated restoration path in the optical network data storehouse;
Step 3, judge whether interrupting service is that wavelength level is professional:
3-1 when the interruption business is the wavelength level business, enters step 4;
3-2, when the interruption business was not the wavelength level business, source node recovered fault according to the wavestrip restoration methods;
Step 4, judge whether restoration path has the homology subpath:
4-1 when restoration path has the homology subpath, enters step 4-1-1;
4-1-1 judges whether the subpath of restoration path is more than 2 jumpings;
When restoration path homology subpath is more than 2 jumpings, enter step 4-1-2;
When restoration path homology subpath is not that source node recovers fault according to traditional wavelength restoration methods more than 2 jumpings;
4-1-2, source node recovers fault according to improved wavelength restoration methods, is idle broadband that wavelength is continuous of restoration path distribution of all homologies, and is specifically as follows step by step:
4-1-2-1, source node is selected the homology subpath, sets up new wavestrip route;
4-1-2-2, optical-fiber network is connected new connection by Path message with Resv message, and each wavestrip route is transmitted with the wavestrip level;
4-1-3, optical-fiber network source node link control module is set up new the connection at restoration path; Recover fault;
4-2, when restoration path did not have the homology subpath, source node recovered fault according to traditional wavelength restoration methods.
In the multiple size light network failure recovery method of described improved GMPLS, the described wavestrip restoration methods of step 3-2 specifically comprises the steps:
Step 301 is directly set up the wavestrip restoration path;
Step 302 according to the situation of existing wavestrip in the optical-fiber network, is shared built wavestrip;
When in the optical-fiber network built wavestrip being arranged, newly-established wavestrip restoration path is shared built wavestrip;
When not having built wavestrip in the optical-fiber network, be that newly-established wavestrip restoration path creates a new idle wavestrip according to the first-fit strategy, recover fault.
In the multiple size light network failure recovery method of described improved GMPLS, the described traditional wavelength restoration methods of step 4-1-1 specifically comprises step by step following:
Step 401 is connected new wavelength connection by the Path message that GMPLS expands in the RSVP with Resv message;
Step 402 is that newly-established wavelength connects the distribution wavelength according to the situation of reserving wavelength in the optical-fiber network;
When the wavelength that newly-established wavelength Connection Sharing has been reserved is arranged when reserving wavelength;
When not reserved wavelength, for connecting, newly-established wavelength sets up a new free wavelength according to the first-fit strategy.
In the multiple size light network failure recovery method of described improved GMPLS, step 402 is described, and to have reserved wavelength be the part of wavelength restoration path during other node failures in the optical-fiber network.
In the multiple size light network failure recovery method of described improved GMPLS, the described built wavestrip of step 302 is the part of wavestrip restoration path during other node failures in the optical-fiber network.
The present invention adopts technique scheme, has following beneficial effect: reduced port cost, shared resource, improved the whole survivability of network.
Description of drawings
Fig. 1 is the schematic diagram that recover in the path in the multiple size light network failure recovery method of improved GMPLS.
Fig. 2 is the flow chart of the multiple size light network failure recovery method of improved GMPLS.
The number in the figure explanation: A, B, C, D, E, F, G, H, I, L, M, N, O are the node in the optical-fiber network, and dotted line represents restoration path.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
What Fig. 1 represented is the situation that the node E in the multiple size light network lost efficacy.Supposed that before breaking down all nodes have the ability of multi-level light exchange, and the light exchanges such as a lot of optical fiber levels, wavestrip level and wavelength level are arranged between each node, the number of wavelengths of wavestrip is at least 2.
Flow chart as shown in Figure 2, the multiple size light network failure recovery method of a kind of improved GMPLS comprises the steps:
Step 2, optical-fiber network source node link control module read every precalculated restoration path in the optical network data storehouse;
Step 3, judge whether interrupting service is that wavelength level is professional:
3-1 when the interruption business is the wavelength level business, enters step 4;
3-2, when the interruption business was not the wavelength level business, source node recovered fault according to the wavestrip restoration methods;
Step 301 is directly set up the wavestrip restoration path;
Step 302 according to the situation of existing wavestrip in the optical-fiber network, is shared built wavestrip;
When in the optical-fiber network built wavestrip being arranged, newly-established wavestrip restoration path is shared built wavestrip;
When not having built wavestrip in the optical-fiber network, be that newly-established wavestrip restoration path creates a new idle wavestrip according to the first-fit strategy, recover fault.
Step 4, judge whether restoration path has the homology subpath:
4-1 when restoration path has the homology subpath, enters step 4-1-1;
4-1-1 judges whether the subpath of restoration path is more than 2 jumpings;
Step 401 is connected new wavelength connection by the Path message that GMPLS expands in the RSVP with Resv message;
Step 402 is that newly-established wavelength connects the distribution wavelength according to the situation of reserving wavelength in the optical-fiber network;
When the wavelength that newly-established wavelength Connection Sharing has been reserved is arranged when reserving wavelength;
When not reserved wavelength, for connecting, newly-established wavelength sets up a new free wavelength according to the first-fit strategy.
When restoration path homology subpath is more than 2 jumpings, enter step 4-1-2;
When restoration path homology subpath is not that source node recovers fault according to traditional wavelength restoration methods more than 2 jumpings;
4-1-2, source node recovers fault according to improved wavelength restoration methods, is idle broadband that wavelength is continuous of restoration path distribution of all homologies, and is specifically as follows step by step:
4-1-2-1, source node is selected the homology subpath, sets up new wavestrip route;
4-1-2-2, optical-fiber network is connected new connection by Path message with Resv message, and each wavestrip route is transmitted with the wavestrip level;
4-1-3, optical-fiber network source node link control module is set up new the connection at restoration path; Recover fault;
4-2, when restoration path did not have the homology subpath, source node recovered fault according to traditional wavelength restoration methods.
Wherein, step 402 is described, and to have reserved wavelength be the part of wavelength restoration path during other node failures in the optical-fiber network, and the described built wavestrip of step 302 is the part of wavestrip restoration path during other node failures in the optical-fiber network.
When professional LSPs arrives node N from node A, find that node E lost efficacy, cause breaking down through all service link of this node, node E dates back source node A with warning information, and keeps the fault recovery type at source node A.As seen from the figure, wavestrip level B-LSP1 (A-D-E-N) is the wavestrip link from A to N, wavelength level W-LSP2(A-G-H-E-N), W-LSP3(A-G-H-M-E-N), W-LSP4(A-G-L-M-E-N), W-LSP5(A-G-L-M-O-E-N), W-LSP6(A-F-E-N) all be that wavelength from A to N connects.Below be respectively their recovery process.
1. during the B-LSP1 fault, under the reset mode based on wave band channel, the A point is set up B-LSP2(A-B-C-N), if there is built wavestrip B-LSP2 just to share built wavestrip, if do not have built wavestrip just according to FF(first-fit) tactful for B-LSP2 sets up a new idle wavestrip, with the processing that realizes that the wavestrip granularity connects.
2. as W-LSP2(A-G-H-E-N) and W-LSP3(A-G-H-M-E-N) during fault, the restoration path homology of these two LSP, and the jumping figure of homology subpath is 2, so be the newly-built idle bandwidth B-LSP3(A-G-H-N of these two LSP just), its wavelength is continuous.
3. with 2., as W-LSP4(A-G-L-M-E-N) and W-LSP5(A-G-L-M-O-E-N) during fault, be its newly-built B-LSP4(A-G-L-M-N).
4. as W-LSP6(A-F-E-N) during fault, owing to do not satisfy homology and dredge strategy, it is carried out wavelength level according to plan recovers, under the reset mode of wavelength channel, the A point is set up W-LSP7(A-F-I-N), if have built wavelength W-LSP7 just to share built wavelength, if do not have just according to FF(first-fit) tactful for W-LSP7 sets up a new free wavelength road warp, with the processing that realizes that the wavelength granularity connects.
Claims (5)
1. the multiple size light network failure recovery method of an improved GMPLS is characterized in that comprising the steps:
Step 1, when in the optical-fiber network node failure being arranged, optical-fiber network location malfunctioning node, malfunctioning node is sent to source node with fault message, and source node is kept the fault recovery type;
Step 2, optical-fiber network source node link control module read every precalculated restoration path in the optical network data storehouse;
Step 3, judge whether interrupting service is that wavelength level is professional:
3-1 when the interruption business is the wavelength level business, enters step 4;
3-2, when the interruption business was not the wavelength level business, source node recovered fault according to the wavestrip restoration methods;
Step 4, judge whether restoration path has the homology subpath:
4-1 when restoration path has the homology subpath, enters step 4-1-1;
4-1-1 judges whether the subpath of restoration path is more than 2 jumpings;
When restoration path homology subpath is more than 2 jumpings, enter step 4-1-2;
When restoration path homology subpath is not that source node recovers fault according to traditional wavelength restoration methods more than 2 jumpings;
4-1-2, source node recovers fault according to improved wavelength restoration methods, is idle broadband that wavelength is continuous of restoration path distribution of all homologies, and is specifically as follows step by step:
4-1-2-1, source node is selected the homology subpath, sets up new wavestrip route;
4-1-2-2, optical-fiber network is connected new connection by Path message with Resv message, and each wavestrip route is transmitted with the wavestrip level;
4-1-3, optical-fiber network source node link control module is set up new the connection at restoration path; Recover fault;
4-2, when restoration path did not have the homology subpath, source node recovered fault according to traditional wavelength restoration methods.
2. the multiple size light network failure recovery method of improved GMPLS according to claim 1, it is characterized in that: the described wavestrip restoration methods of step 3-2 specifically comprises the steps:
Step 301 is directly set up the wavestrip restoration path;
Step 302 according to the situation of existing wavestrip in the optical-fiber network, is shared built wavestrip;
When in the optical-fiber network built wavestrip being arranged, newly-established wavestrip restoration path is shared built wavestrip;
When not having built wavestrip in the optical-fiber network, be that newly-established wavestrip restoration path creates a new idle wavestrip according to the first-fit strategy, recover fault.
3. the multiple size light network failure recovery method of improved GMPLS according to claim 1, it is characterized in that: the described traditional wavelength restoration methods of step 4-1-1 specifically comprises step by step following:
Step 401 is connected new wavelength connection by the Path message that GMPLS expands in the RSVP with Resv message;
Step 402 is that newly-established wavelength connects the distribution wavelength according to the situation of reserving wavelength in the optical-fiber network;
When the wavelength that newly-established wavelength Connection Sharing has been reserved is arranged when reserving wavelength;
When not reserved wavelength, for connecting, newly-established wavelength sets up a new free wavelength according to the first-fit strategy.
4. the multiple size light network failure recovery method of improved GMPLS according to claim 3 is characterized in that: step 402 is described, and to have reserved wavelength be the part of wavelength restoration path during other node failures in the optical-fiber network.
5. the multiple size light network failure recovery method of improved GMPLS according to claim 2 is characterized in that: the described built wavestrip of step 302 is the part of wavestrip restoration path during other node failures in the optical-fiber network.
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| RU2564633C1 (en) * | 2012-06-20 | 2015-10-10 | Хуавэй Текнолоджиз Ко., Лтд. | Method, system and node apparatus for establishing recovery path |
| CN104301030A (en) * | 2014-09-18 | 2015-01-21 | 南京邮电大学 | Share protection strategy supporting flow dredging flexible optical network |
| CN104967477B (en) * | 2015-06-26 | 2018-03-13 | 南京邮电大学 | Optical-fiber network intelligence P circle guard methods based on multicast service |
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| CN1713779A (en) * | 2004-06-23 | 2005-12-28 | 北京邮电大学 | Light channel creation control in light exchange network with multi-particle size |
| CN101656897A (en) * | 2009-08-31 | 2010-02-24 | 东北大学 | Method for grooming multilayer multi-granularity traffic in waveband switching optical network |
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| CN1713779A (en) * | 2004-06-23 | 2005-12-28 | 北京邮电大学 | Light channel creation control in light exchange network with multi-particle size |
| CN101656897A (en) * | 2009-08-31 | 2010-02-24 | 东北大学 | Method for grooming multilayer multi-granularity traffic in waveband switching optical network |
| CN102026051A (en) * | 2010-12-13 | 2011-04-20 | 西安交通大学 | Layered virtual topology-based cross-granularity layer survivability method |
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