CN103401720B - A kind of method of service in automatic switched optical network layering - Google Patents
A kind of method of service in automatic switched optical network layering Download PDFInfo
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Abstract
The present invention relates to a kind of method of service in automatic switched optical network layering, on two different levels, set up respectively ASONT tunnel and the granule business with different exchange capacities, and ASONT tunnel be abstracted into a virtual TE Link offer each granule business do route calculate use, set up short grained SPC business by these virtual TE Links, in this case, multitiered network belongs to same traffic engineering territory, in the routing table of each TE Link (comprising actual TE Link and virtual TE Link) each node in network of distinct interface exchange capacity, can see, the business of different levels is used respectively the routing iinformation that is applicable to this level. the method of service in automatic switched optical network layering of the present invention, can be in the ASON of current Loading Control plane network, and the Automatic dispatching and the dynamic protection that effectively solve granule business recover problem, save network operation cost.
Description
Technical field
The present invention relates to ASON(ASON, AutomaticallySwitchedOpticalNetwork) network is a kind of service in automatic switched optical network layering specificallyMethod. Espespecially in ASON network, realize the method that business layering is set up.
Background technology
In recent years, based on GMPLS(general multiple protocols mark exchange agreement, GeneralizedThe application of Based Intelligent Control planar technique MultiprotocolLabelSwitching) is mainConcentrate in single exchange aspect. Be applied at first traditional SDH(SDH,SynchronousDigitalHierarchy) network, adopts MESH(wireless mesh network)Networking structure, optical transmission device only has single TDM(TimeDivisionMultiplex)Exchange capacity. What initial intelligent control technology mainly solved is the control problem of TDM aspect,Realize at first the business scheduling of SDHVC-4 rank, can provide abundant protection to recover meritThe functions such as energy and business Automatic dispatching.
The network that belongs to the difference exchange particle under same exchange capacity is called multitiered network(MLN:Multi-LayerNetwork). In the MLN of GMPLS, the concept of " layer " is retouchedState the exchange particle of a datum plane, for example: SDHVC-4, VC-12. Therefore, oneThe datum plane exchange layer of individual multitiered network can have identical interface exchange capacity, or notSame interface exchange capacity, but by the control of single GMPLS control plane entity.
Along with deepening continuously of control plane technology application, the application in single exchange aspect graduallyGradually can not meet multifaceted dispatching requirement in current network, this need to be to multifaceted control skillArt is studied. Along with the development of network flattening and integrated chip technology, communication network devicePossessed powerful multi-service fusion disposal ability and very high integrated level, individual equipment just canPossess the traffic handing capacity of many levels, the control technology to stage construction traffic handing capacityDemand also produces thereupon.
Using in the SDH network of control plane technology, wish loads has dynamic recovery capabilityThe granule business (hereinafter to be referred as granule) of 2M or VC-12, industry generally adopts at presentTechnology is tunneling technique, first sets up a VC-4 rank ASONT(ASONTunnel) doFor tunnel, this ASONT is the SPC(soft permanent connection with dynamic protection recovery capability, SoftPermanentConnection) business, then taking this ASONT tunnel as Foundation granulePC(forever connect, PermanentConnection) business. This shows thisPlanting granule business is the mixed service of PC and SPC, is not SPC industry trulyBusiness, the protection class of its small particles business is to be determined by the protection class in ASONT tunnel,What in the time there is link or node failure, occur dynamically to recover is also ASONT tunnel.
In current ASON network environment, high-order business and granule business all exist in a large numberAnd meeting different clients' demand, current control plane technology can only solve the moving of high-order businessState is recovered problem, and granule business still adopts traditional PC connected mode to be present in existing network,Automatic dispatching and dynamic restore funcitons how to realize granule business become current urgent need solutionProblem.
Summary of the invention
For the defect existing in prior art, the object of the present invention is to provide a kind of friendship automaticallyChange the method for business layering in optical-fiber network, high-order business and the layering of granule business are set up, withSolve Automatic dispatching and the dynamic recovery problem of granule business.
For reaching above object, the technical scheme that the present invention takes is:
In the network based on GMPLS, the concept of network hierarchy is proposed, upper layer network and lower floorBetween network, be client's (client layer) and server's (service layer) relation, service layer opens upFlutter and link property is sightless for client layer, the resource in service layer is with virtual TE LinkForm present to client layer network. The LSP(label switched path creating in service layer,LabelSwitchPath) can be by client layer as virtual TE Link and at control plane netIn network, flood, in the time that client layer LSP leads to the border of service layer's passage from client layer, client layerLSP can be nested in the LSP of service layer. Client layer LSP and the LSP of service layer haveThe dynamically SPC business of restore funcitons, in principle in the time of traffic failure, when the LSP of service layer can send outWhen raw dynamic protection recovers, client layer LSP does not start dynamic protection restore funcitons, only at clothesBusiness layer LSP cannot meet under the prerequisite of dynamic protection recovery, and client layer LSP just starts dynamically guarantorProtect restore funcitons.
The method of this service in automatic switched optical network layering, is characterized in that: at two notOn same level, set up respectively the ASONT tunnel (LSP of service layer) with different exchange capacitiesWith granule business (client layer LSP), and ASONT tunnel is abstracted into a virtual TE chainRoad offers each granule business and does route calculating use, sets up by these virtual TE LinksShort grained SPC business.
In this case, multitiered network belongs to same traffic engineering territory, distinct interface exchangeEach TE Link (comprising actual TE Link and virtual TE Link) of ability in network eachIn the routing table of node, can see, the business of different levels is used respectively the road that is applicable to this levelBy information.
On the basis of technique scheme, using granule business as upper strata client layer, willASONT tunnel is as service layer of lower floor; For client layer network is set up virtual network topology VNT(VirtualNetworkTop), described VNT by one group of ASONT tunnel as virtual TELink composition, VNT is the logical topology being made up of the LSP of service layer, for client layer LSP carries outRoute is calculated and is submitted necessary information.
On the basis of technique scheme, the mode of setting up of the LSP of service layer is divided into two kinds:
Quiescent state establishment, adopts human configuration mode in advance, is triggered and is set up by management plane;
Dynamic Establishing, adopts route triggering mode, by granule business in the process of setting up fromMovable contact is sent out foundation.
On the basis of technique scheme, quiescent state establishment is pre-before client layer LSP sets upFirst set up and specify the LSP of protection class to offer client layer as virtual TE Link in service layerUse; In the time setting up client layer LSP, can be the protection type of its specified services layer LSP, visitorFamily layer LSP carries out Route Selection and finally completes visitor according to the protection type of specified services layer LSPThe business of family layer LSP is set up.
On the basis of technique scheme, Dynamic Establishing refers to the mistake that client layer LSP is setting upThe satisfactory LSP of service layer of dynamic creation in journey; In the time setting up client layer LSP, can be itThe protection type of specified services layer LSP, client layer LSP is according to the service layer's protection that is its appointmentWhen type is carried out Route Selection, finding, in the current LSP of service layer, does not have satisfactoryVirtual TE Link, will automatically be triggered and set up the satisfactory LSP of service layer conduct by routeThe route resource of client layer LSP; After having set up, continues again the LSP of service layer clientThe Route Selection of layer LSP also finally completes the business of client layer LSP and sets up.
On the basis of technique scheme, the LSP of service layer only process high-order Cross Trade carries out heightRank intersect, and client layer LSP need to carry out low order interlace algorithm through low order interlace algorithm dish.
On the basis of technique scheme, the LSP of service layer is the basis that client layer LSP exists,So deleting, the protection type of the LSP of service layer, bandwidth and foundation directly has influence on client layer LSP.The just point impact of the different LSP of briefing service layer on client layer LSP below:
1) the protection type of the LSP of service layer: if user need to set up client layer LSP, work as netWhile there is the LSP of service layer of kinds of protect type in network, user needs given client according to demandLayer LSP is carried on the LSP of service layer of which kind of type. In principle in the time of traffic failure, headFirst carry out dynamic protection recovery by the LSP of service layer, it is extensive that client layer LSP does not start dynamic protectionMultiple function; Only cannot meet under the prerequisite of dynamic protection recovery client layer at the LSP of service layerLSP just starts dynamic protection restore funcitons.
2) foundation of the LSP of service layer and deletion: in the time that a LSP of service layer has set up,Will carry out route at the whole network and flood, notice other network elements, a new LSP of service layer is passableUse as virtual TE Link, needed the network element of the whole network to increase by one in the routing table of oneselfBar route entry is also upgraded bandwidth. In like manner, in the time that needs are deleted a LSP of service layer, also canCarry out route at the whole network and flood, notice the routing table of other network elements renewals oneself, delete correspondingVirtual TE Link.
3) bandwidth of the LSP of service layer: when user sets up or deletes on the LSP of Mou Tiao service layerWhen client layer LSP, will be corresponding as the bandwidth on the LSP of service layer of virtual TE LinkReduce or increase, the LSP of service layer will flood this variation in whole network, notices itThe current bandwidth number of his this virtual TE Link of network element, facilitates later client layer LSP roadDuring by calculating, use. In the time there is network failure, if the LSP of service layer cannot recover, tableThe abstract virtual TE Link out of the LSP of Ming Ci service layer, can not be again by visitor in malfunctionFamily layer LSP uses, and used the client layer LSP of the LSP of this service layer need to start dynamic guarantorProtect restore funcitons, newly-built client layer LSP can not re-use the LSP of this service layer.
The method of service in automatic switched optical network layering of the present invention, can add currentCarry in the ASON network of control plane, effectively solve the Automatic dispatching of granule business with dynamicProtection recovery problem, saves network operation cost. Estimate that the method is applied in current automatic friendshipChange in optical-fiber network, will produce larger economic benefit.
Brief description of the drawings
The present invention has following accompanying drawing:
Fig. 1 business hierarchical mode;
Fig. 2 high-order LSP of service layer dynamically recovers schematic diagram;
Fig. 3 granule client layer LSP dynamically recovers schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
It is dynamically extensive that Fig. 1-Fig. 3 has described respectively model, the LSP of high-order service layer of business layeringThe schematic diagram multiple and granule client layer LSP dynamically recovers. In example, create respectively serviceLayer LSP and client layer LSP, the LSP of service layer only process high-order Cross Trade carries out high-order intersection,Client layer LSP need to carry out low order interlace algorithm through low order interlace algorithm dish.
Figure 1 shows that the business hierarchical mode that comprises client layer and service layer, LSP1 in figure,LSP2, LSP3 is the LSP of service layer, wherein LSP1 is the LSP of service layer that comprises 2 jumpings, LSP2With LSP3 be the LSP of service layer that comprises 1 jumping. Words port from granule client layer LSPLower words port to granule client layer LSP has two optional routes, is respectively the straight of LSP1Connect route and the indirectly connected route through LSP2 and LSP3. This shows, although serviceLayer LSP1 is through an intermediate NE, but this network element is invisible for client layer LSP, client layer LSP only uses LSP1 as a virtual TE Link. 3 of service layerBar LSP adds in routing table for client layer LSP and builds being abstracted into 3 virtual TE LinksRoute Selection is used immediately. When client layer carries out route calculating, only use by abstract void outIntend TE Link, and can not use actual TE Link to carry out route calculating.
Figure 2 shows that the schematic diagram that the LSP of high-order service layer dynamically recovers, figure small particles clientLayer LSP is carried on the LSP1 of high-order service layer. The LSP1 of high-order service layer enters in high-order Cross TradeRow high-order intersects, and granule client layer LSP carries out low order interlace algorithm at low order interlace algorithm dish. Work as businessWhile breaking down, initiate dynamically to recover flow process by the LSP1 of high-order service layer, re-establish high-orderIntersect, generate the LSP2 of high-order service layer, the intersection of granule client layer LSP does not occurChange.
Figure 3 shows that the schematic diagram that granule client layer LSP dynamically recovers, figure small particles visitorFamily layer LSP is carried on the LSP1 of high-order service layer. The LSP1 of high-order service layer is in high-order Cross TradeCarry out high-order intersection, granule client layer LSP carries out low order interlace algorithm at low order interlace algorithm dish. Work as industryWhen business is broken down, because the LSP1 of high-order service layer cannot dynamically recover, so will be by littleGrain client layer LSP initiates dynamically to recover flow process, granule client layer LSP calculate through route andSignalling exchange, finally sets up a granule through the LSP2 of high-order service layer and LSP3 logicalRoad, regenerates the low order interlace algorithm of granule client layer, recovers the business of fault.
It is known that the content not being described in detail in this description belongs to professional and technical personnel in the fieldPrior art.
Claims (3)
1. a method for service in automatic switched optical network layering, is characterized in that: twoOn individual different level, set up respectively ASONT tunnel and the granule with different exchange capacitiesBusiness, and ASONT tunnel is abstracted into a virtual TE Link offers each granule businessMake route and calculate use, set up short grained SPC business by these virtual TE Links;
In this case, multitiered network belongs to same traffic engineering territory, distinct interface exchangeIn the routing table of each TE Link each node in network of ability, can see different levelsBusiness use respectively and be applicable to the routing iinformation of this level, described distinct interface exchange capacity eachTE Link comprises actual TE Link and virtual TE Link;
Using granule business as upper strata client layer, using ASONT tunnel as service layer of lower floor;For client layer network is set up virtual network topology VNT (VirtualNetworkTop), described inVNT is made up of as virtual TE Link one group of ASONT tunnel, and VNT is by the LSP of service layer structureThe logical topology becoming, submits necessary information for client layer LSP carries out route calculating;
The mode of setting up of the LSP of service layer is divided into two kinds:
Quiescent state establishment, adopts human configuration mode in advance, is triggered and is set up by management plane;
Dynamic Establishing, adopts route triggering mode, automatic in process of establishing by granule businessTrigger and set up;
Quiescent state establishment is to set up and specify protection in service layer in advance before client layer LSP sets upThe LSP of grade offers client layer and uses as virtual TE Link; When setting up client layer LSPTime, can be the protection type of its specified services layer LSP, client layer LSP is according to specified services layerThe protection type of LSP is carried out Route Selection and is finally completed the business foundation of client layer LSP.
2. the method for service in automatic switched optical network layering as claimed in claim 1, itsBe characterised in that: Dynamic Establishing refer to client layer LSP set up process in dynamic creation meet wantThe LSP of service layer asking; In the time setting up client layer LSP, can be the guarantor of its specified services layer LSPProtect type, client layer LSP carries out Route Selection according to the service layer's protection type for its appointmentTime, finding, in the current LSP of service layer, does not have satisfactory virtual TE Link, justCan automatically trigger and set up the route of the satisfactory LSP of service layer as client layer LSP by routeResource; After having set up, continues again the LSP of service layer the Route Selection of client layer LSPAnd the business that finally completes client layer LSP is set up.
3. the method for service in automatic switched optical network layering as claimed in claim 1, itsBe characterised in that: the LSP of service layer only process high-order Cross Trade carries out high-order intersection, client layer LSPNeed to carry out low order interlace algorithm through low order interlace algorithm dish.
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| CN103763190B (en) * | 2014-02-26 | 2017-01-04 | 武汉邮电科学研究院 | A kind of layering route restriction method of low-order service in ASON |
| EP3276890B1 (en) * | 2015-04-17 | 2020-08-26 | Huawei Technologies Co., Ltd. | Preserving method and device for virtual network |
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| EP1983689A1 (en) * | 2006-01-28 | 2008-10-22 | ZTE Corporation | A control method for the cross-domain call and the connection of ason |
| CN101051992A (en) * | 2006-04-17 | 2007-10-10 | 华为技术有限公司 | Method for calculating customer layer service soute in multilayer network |
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