CN103401720A - Method for business layering in ASON - Google Patents
Method for business layering in ASON Download PDFInfo
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- CN103401720A CN103401720A CN2013103547133A CN201310354713A CN103401720A CN 103401720 A CN103401720 A CN 103401720A CN 2013103547133 A CN2013103547133 A CN 2013103547133A CN 201310354713 A CN201310354713 A CN 201310354713A CN 103401720 A CN103401720 A CN 103401720A
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Abstract
The invention relates to a method for business layering in an ASONT. ASONT (automatically switched optical network) tunnels with different exchange capacities and granule businesses are respectively built on two different levels, the ASONT tunnels are abstracted to be virtual TE (traffic engineering) links to be supplied to all granule businesses for routing computation, a granule SPC (soft permanent connection) business is built through the virtual TE links, under the condition, MLNs (Multi-layer networks) belong to the same traffic engineering region, all TE links (including actual TE links and virtual TE links) with different interface exchange capacities can be seen in routing lists at all nodes in a network, and businesses in different levels respectively use routing information suitable for the levels. The method for business layering in the ASONT can effectively solve the problems in automatic scheduling and dynamic protection recovery of the granule businesses, and saves network maintenance cost in the current ASONT loaded with a control plane.
Description
Technical field
The present invention relates to the ASON(ASON, Automatically Switched Optical Network) network is a kind of method of service in automatic switched optical network layering specifically.Espespecially in the ASON network, realize the method that the business layering is set up.
Background technology
The application of Based Intelligent Control planar technique based on GMPLS(general multiple protocols sign exchange agreement, Generalized Multiprotocol Label Switching in recent years) mainly concentrates on single exchange aspect.Be applied at first traditional SDH(SDH (Synchronous Digital Hierarchy), Synchronous Digital Hierarchy) network, adopt the MESH(wireless mesh network) networking structure, optical transmission device only has single TDM(Time Division Multiplex) exchange capacity.What initial intelligent control technology mainly solved is the control problem of TDM aspect, has realized at first the scheduling of other business of SDH VC-4 level, and the functions such as abundant protection restore funcitons and business Automatic dispatching can be provided.
The network that belongs to the difference exchange particle under the same exchange capacity is called multitiered network (MLN:Multi-Layer Network).In the MLN of GMPLS, the conceptual description of " layer " the exchange particle on a data plane, for example: SDH VC-4, VC-12.Therefore, the datum plane of multitiered network exchange layer can have identical interface exchange capacity, or different interface exchange capacities, but is controlled by single GMPLS control plane entity.
Along with deepening continuously of control plane technology application, the application on single exchange aspect can not meet multifaceted dispatching requirement in current network gradually, and this need to study multifaceted control technology.Development along with network flattening and integrated chip technology, communication network device has possessed powerful multi-service fusion disposal ability and very high integrated level, individual equipment just can possess the traffic handing capacity of many levels, and the demand of the control technology of stage construction traffic handing capacity is also produced thereupon.
In the SDH network that uses control plane technology; wish loads the granule business (hereinafter to be referred as granule) of 2M or VC-12 with dynamic recovery capability; the technology that present industry generally adopts is tunneling technique; namely first set up a VC-4 rank ASONT(ASON Tunnel) as tunnel; this ASONT is the SPC(soft permanent connection with dynamic protection recovery capability; Soft Permanent Connection) business; take this ASONT tunnel as the short grained PC(of Foundation, forever connect again Permanent Connection) business.This shows that this granule business is the mixed service of PC and SPC; it is not SPC business truly; the protection class of its small particles business is to be determined by the protection class in ASONT tunnel, and what when link or node failure occurring, occur dynamically to recover is also the ASONT tunnel.
In present ASON network environment, all there are and meet different clients' demand in a large number in high-order business and granule business, current control plane technology can only solve the dynamic recovery problem of high-order business, the granule business still adopts traditional PC connected mode to be present in existing network, how to realize that the Automatic dispatching of granule business and dynamic restore funcitons become current urgent problem.
Summary of the invention
For the defect that exists in prior art, the object of the present invention is to provide a kind of method of service in automatic switched optical network layering, high-order business and the layering of granule business are set up, with Automatic dispatching and the dynamic recovery problem that solves the granule business.
For reaching above purpose, the technical scheme that the present invention takes is:
In the network based on GMPLS, the concept of network hierarchy is proposed, it between upper layer network and lower floor's network, is client's (client layer) and server's (service layer) relation, the topological sum link property of service layer is sightless for client layer, and the resource in service layer is presented to the client layer network with the form of virtual TE Link.The LSP(label switched path that creates in service layer, Label Switch Path) can be used as virtual TE Link and flood in the control plane network by client layer, when client layer LSP led to the border of service layer's passage from client layer, client layer LSP can be nested in the LSP of service layer.Client layer LSP and the LSP of service layer can be all the SPC business with dynamic restore funcitons; in principle when traffic failure; when the dynamic protection recovery can occur in the LSP of service layer; client layer LSP does not start the dynamic protection restore funcitons; only at the LSP of service layer, can't meet under the prerequisite of dynamic protection recovery, client layer LSP just starts the dynamic protection restore funcitons.
The method of this service in automatic switched optical network layering, it is characterized in that: on two different levels, set up and have ASONT tunnel (LSP of service layer) and the granule business (client layer LSP) of different exchange capacities respectively, and the ASONT tunnel is abstracted into to a virtual TE Link offers each granule business and make route and calculate to use, by these virtual TE Links, set up short grained SPC business.
In this case, multitiered network belongs to same traffic engineering territory, on the routing table of each TE Link of distinct interface exchange capacity (comprising actual TE Link and virtual TE Link) each node in network, can see, the business of different levels is used respectively the routing iinformation that is suitable for this level.
On the basis of technique scheme, using the granule business as the upper strata client layer, using the ASONT tunnel as service layer of lower floor; For the client layer network is set up virtual network topology VNT(Virtual Network Top), described VNT is comprised of as virtual TE Link one group of ASONT tunnel, VNT is the logical topology that consists of the LSP of service layer, for client layer LSP carries out route calculating, submits 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, adopt human configuration mode in advance, by management plane, triggered and set up;
Dynamic Establishing, adopt the route triggering mode, by the granule business, in the process of setting up, automatically triggered and set up.
On the basis of technique scheme, quiescent state establishment is before client layer LSP sets up, in service layer's foundation, to specify the LSP of protection class to offer client layer in advance to use as virtual TE Link; When setting up client layer LSP, can be the protection type of its specified services layer LSP, client layer LSP carries out Route Selection according to the protection type of specified services layer LSP and finally completes the business foundation of client layer LSP.
On the basis of technique scheme, Dynamic Establishing refers to client layer LSP satisfactory LSP of service layer of dynamic creation in the process of setting up; When setting up client layer LSP, can be the protection type of its specified services layer LSP, when client layer LSP carries out Route Selection according to the protection type of the service layer for its appointment, discovery is in the current LSP of service layer, there is no satisfactory virtual TE Link, will automatically trigger and set up the route resource of the satisfactory LSP of service layer as client layer LSP by route; The Route Selection that has continued again client layer LSP after the LSP of service layer foundation completes also finally completes the business foundation of client layer LSP.
On the basis of technique scheme, the LSP of service layer only process high-order Cross Trade carries out the high-order intersection, and client layer LSP need to carry out low order interlace algorithm through the 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 the protection type of the LSP of service layer, bandwidth and foundation deletion directly have influence on client layer LSP.Below the just minute different LSP of the briefing service layer impact on client layer LSP:
1) the protection type of the LSP of service layer: if the user need to set up client layer LSP, when in network, having the LSP of service layer of kinds of protect type, the user needs given client layer LSP according to demand to be carried on the LSP of service layer of which kind of type.When traffic failure, at first by the LSP of service layer, carry out the dynamic protection recovery in principle, client layer LSP does not start the dynamic protection restore funcitons; Only at the LSP of service layer, can't meet under the prerequisite of dynamic protection recovery, client layer LSP just starts the dynamic protection restore funcitons.
2) foundation of the LSP of service layer and deletion: when the LSP of a service layer foundation completes, will carry out route at the whole network floods, announce other network elements, article one, the new LSP of service layer can be used as virtual TE Link and has used, and needs the network element of the whole network in the routing table of oneself, increase a route entry and upgrade bandwidth.In like manner, when a LSP of service layer of needs deletion, also can carry out route at the whole network and flood, announce the routing table that other network elements upgrade oneself, delete corresponding virtual TE Link.
3) bandwidth of the LSP of service layer: set up on certain LSP of service layer as the user or while deleting client layer LSP, as the bandwidth on the LSP of service layer of virtual TE Link, will reduce accordingly or increase, the LSP of service layer will flood this variation in whole network, announce the current bandwidth number of other these virtual TE Links of network element, facilitate later client layer LSP to use when route is calculated.When network failure occurs when; if the LSP of service layer can't recover; show that the abstract virtual TE Link out of the LSP of this service layer is in malfunction; can not by client layer LSP, be used again; used the client layer LSP of the LSP of this service layer need to start the dynamic protection 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 be in the ASON network on current Loading Control plane, and the Automatic dispatching and the dynamic protection that effectively solve the granule business recover problem, save the network operation cost.Estimate that the method is applied in current ASON, will produce larger economic benefit.
The accompanying drawing explanation
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.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1-Fig. 3 has described respectively the model of business layering, the schematic diagram that the LSP of high-order service layer dynamically recovers and granule client layer LSP dynamically recovers.In example, created respectively the LSP of service layer and client layer LSP, the LSP of service layer only process high-order Cross Trade carries out the high-order intersection, and client layer LSP need to carry out low order interlace algorithm through the 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 are the LSP of service layer, and wherein LSP1 comprises 2 LSP of service layer that jump, and LSP2 and LSP3 comprise 1 LSP of service layer that jumps.Lower words port from the upper words port of granule client layer LSP to granule client layer LSP has two optional routes, is respectively the direct-connected route of LSP1 and through the indirectly connected route of LSP2 and LSP3.This shows, although the LSP1 of service layer through an intermediate NE, this network element is sightless for client layer LSP, client layer LSP only uses LSP1 as a virtual TE Link.3 LSP of service layer add in routing table route choice for use while setting up for client layer LSP to by being abstracted into 3 virtual TE Links.When client layer carries out route calculating, only use by abstract virtual TE Link out, 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 client layer LSP is carried on the LSP1 of high-order service layer.The LSP1 of high-order service layer carries out the high-order intersection in the high-order Cross Trade, and granule client layer LSP carries out low order interlace algorithm at the low order interlace algorithm dish.When business breaks down, by the LSP1 of high-order service layer, initiate dynamically to recover flow process, re-establish high-order and intersect, generate the LSP2 of high-order service layer, the intersection of granule client layer LSP does not change.
Figure 3 shows that the schematic diagram that granule client layer LSP dynamically recovers, figure small particles client layer LSP is carried on the LSP1 of high-order service layer.The LSP1 of high-order service layer carries out the high-order intersection in the high-order Cross Trade, and granule client layer LSP carries out low order interlace algorithm at the low order interlace algorithm dish.When business breaks down, because the LSP1 of high-order service layer can't dynamically recover, so will initiate dynamically to recover flow process by granule client layer LSP, granule client layer LSP calculates and Signalling exchange through route, finally set up a granule passage through the LSP2 of high-order service layer and LSP3, regenerate the low order interlace algorithm of granule client layer, recover the business of fault.
The content that is not described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (6)
1. the method for a service in automatic switched optical network layering, it is characterized in that: on two different levels, set up and have ASONT tunnel and the granule business of different exchange capacities respectively, and the ASONT tunnel is abstracted into to a virtual TE Link offers each granule business and make route and calculate to use, by these virtual TE Links, set up short grained SPC business;
In this case, multitiered network belongs to same traffic engineering territory, on the routing table of each 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 suitable for this level, and each TE Link of described distinct interface exchange capacity comprises actual TE Link and virtual TE Link.
2. the method for service in automatic switched optical network layering as claimed in claim 1, is characterized in that: using the granule business as the upper strata client layer, using the ASONT tunnel as service layer of lower floor; For the client layer network is set up virtual network topology VNT(Virtual Network Top), described VNT is comprised of as virtual TE Link one group of ASONT tunnel, VNT is the logical topology that consists of the LSP of service layer, for client layer LSP carries out route calculating, submits necessary information.
3. the method for service in automatic switched optical network layering as claimed in claim 2, it is characterized in that: the mode of setting up of the LSP of service layer is divided into two kinds:
Quiescent state establishment, adopt human configuration mode in advance, by management plane, triggered and set up;
Dynamic Establishing, adopt the route triggering mode, by the granule business, in setting up process, automatically triggered and set up.
4. the method for service in automatic switched optical network layering as claimed in claim 3 is characterized in that: quiescent state establishment is before client layer LSP sets up, in service layer, to set up the LSP that specifies protection class in advance to offer client layer and use as virtual TE Link; When setting up client layer LSP, can be the protection type of its specified services layer LSP, client layer LSP carries out Route Selection according to the protection type of specified services layer LSP and finally completes the business foundation of client layer LSP.
5. the method for service in automatic switched optical network layering as claimed in claim 3 is characterized in that: Dynamic Establishing refers to client layer LSP satisfactory LSP of service layer of dynamic creation in the process of setting up; When setting up client layer LSP, can be the protection type of its specified services layer LSP, when client layer LSP carries out Route Selection according to the protection type of the service layer for its appointment, discovery is in the current LSP of service layer, there is no satisfactory virtual TE Link, will automatically trigger and set up the route resource of the satisfactory LSP of service layer as client layer LSP by route; The Route Selection that has continued again client layer LSP after the LSP of service layer foundation completes also finally completes the business foundation of client layer LSP.
6. the method for service in automatic switched optical network layering as claimed in claim 2 is characterized in that: the LSP of service layer only through high-order Cross Trade carry out the high-order intersection, client layer LSP need to carry out low order interlace algorithm through the low order interlace algorithm dish.
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| WO2016165142A1 (en) * | 2015-04-17 | 2016-10-20 | 华为技术有限公司 | Preserving method and device for virtual network |
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| CN103763190A (en) * | 2014-02-26 | 2014-04-30 | 武汉邮电科学研究院 | Layering route retraining method of low-order service in automatic switch optical network |
| 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 |
| WO2016165142A1 (en) * | 2015-04-17 | 2016-10-20 | 华为技术有限公司 | Preserving method and device for virtual network |
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