CN103685580A - Software-defined-network-based northbound interface access system and method - Google Patents
Software-defined-network-based northbound interface access system and method Download PDFInfo
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Abstract
The invention provides a software-defined-network-based northbound interface access system which is used for supporting controllers in different protocol specifications to get access to a software-defined network and have communication with upper layer network service. The system comprises a conversion module and an adaptive engine module capable of being dynamically loaded, the conversion module acquires and records characteristics of the upper layer network service and characteristics of the controllers provided with known northbound interfaces, the adaptive engine module receives messages of the upper layer network service and analyzes and processes the messages, the conversion module converts formats of the analyzed and processed messages according to the recorded controller information and a protocol of the target controller and issues the messages, the adaptive engine module analyzes the messages sent by the controllers and processes the messages into formats recognized by the upper layer network service, and then the messages are forwarded according to the recorded characteristics of the upper layer network service through the conversion module. Communication between the upper layer network service and different protocol controllers is achieved through the adaptive engine module, and the adaptive engine module can be dynamically loaded and is high in expansibility. The invention further provides an access method.
Description
Technical field
The present invention relates to software defined network technology, relate in particular to a kind of northbound interface connecting system based on software defined network.
Background technology
At present, a lot of technology application all can be used software defined network (Software Defined Network, SDN) as the diverse network demand environment of data center, in cloud computing IaaS layer, use the demand environment of virtual network, the demand environment of the plant maintenance of pattern of fusion network node in metropolitan area network, virtual in backbone network/abstract, plan optimization, path computation, traffic engineering, concentrate the demand environments such as O&M and value-added service, at software defined network (Software Defined Network, SDN) in, SDN controller up arrives north orientation application programming interfaces (the Application Programming Interface of network service application layer, API) not yet there is definition, present stage SDN controller north orientation application programming interfaces (Application Programming Interface, API) agreement is all used own mode and not standardization, each controller manufacturer is according to the requirement definition northbound interface API of oneself.
Yet, because SDN protocol infrastructure does not become standard in the industry, within the following quite a long time, SDN controller has multiple, existing SDN network cannot guarantee that all upper layer network services are linked in the SDN network of various different agreement standards and the SDN controller of different agreement access SDN network, and inconvenient operation, autgmentability are lower.
Summary of the invention
In view of this, the invention provides a kind of northbound interface connecting system and method based on software defined network that can improve the northbound interface autgmentability of SDN network.
A kind of northbound interface connecting system based on software defined network, it is for supporting software defined network (the Software Defined Network of various different agreement standards, SDN) access of controller is so that at least one SDN controller and at least one upper layer network communication for service, the described northbound interface connecting system based on software defined network comprises the adaptation engine module that a conversation module and at least one capable of dynamic load, described conversation module obtains and records that described in the network characterization of described at least one upper layer network service and network, at least one has the characteristic information of the SDN controller of known northbound interface, described at least one adaptation engine module receives the message of described at least one upper layer network service and carries out after dissection process is converted to internal form sending to described conversation module, described conversation module carries out the message of dissection process to be issued to target SDN controller after format conversion according to the agreement of target SDN controller according to the SDN controller characteristic information of record, the message that described in described at least one adaptation engine module parses, at least one SDN controller sends the form that is processed into upper layer network service identification are forwarded to corresponding upper layer network service by described conversation module according to the network characterization of the upper layer network service of record.
A kind of northbound interface cut-in method based on software defined network, it is for supporting software defined network (the Software Defined Network of various different agreement standards, SDN) access of controller is so that at least one SDN controller and at least one upper layer network communication for service, and the described northbound interface cut-in method based on software defined network comprises the following steps:
Described in obtaining and recording, in the network characterization of at least one upper layer network service and network, there is the characteristic information of the SDN controller of known northbound interface;
After receiving the message of described at least one upper layer network service and carrying out dissection process, according to the SDN controller characteristic information of record, according to the agreement of target SDN controller, carry out being issued to target SDN controller after format conversion;
After the message that described at least one the SDN controller of parsing sends the form that is processed into upper layer network service identification, according to the network characterization of the upper layer network service of record, be forwarded to corresponding upper layer network service.
Compared with prior art, in northbound interface connecting system and method based on software defined network provided by the invention, utilize adaptation engine module parses to process the message that upper layer network service is communicated by letter with lower floor SDN controller, thereby guarantee that all upper layer network services are linked in the SDN network of various different agreement standards, the SDN controller of different agreement is accessible SDN network also, loading due to adaptation engine module capable of dynamic, thereby can support the access of unknown various controller, easy to operate, autgmentability is higher.
Accompanying drawing explanation
Fig. 1 is the network site schematic diagram of the northbound interface connecting system of application provided by the invention based on software defined network.
Fig. 2 is the module diagram of the northbound interface connecting system based on software defined network provided by the invention.
Fig. 3 is the flow chart of the northbound interface cut-in method based on software defined network provided by the invention.
Main element symbol description
Northbound interface connecting system 100 based on software defined network
Conversation module 110
Adaptation engine module 120
Allocate layer 300
Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1 and Fig. 2, a kind of northbound interface connecting system 100 based on software defined network that embodiment of the present invention provides is for supporting software defined network (the Software Defined Network of various different agreement standards, SDN) access of controller is so that at least one the upper layer network communication for service at least one SDN controller and application layer 200, described northbound interface connecting system 100 can be arranged on to be allocated in layer (orchestration layer) 300, in the server of SDN controller operation or in independent server, in present embodiment, northbound interface connecting system 100 is arranged in orchestration layer.Northbound interface connecting system 100 based on software defined network comprises a conversation module 110 and at least one adaptation engine module 120, in present embodiment, corresponding n adaptation engine module 120 of n in application layer 200 network service difference, n SDN controller corresponding n adaptation engine module 120 of difference and n switch.
For obtaining and record the network characterization of upper layer network service and network, at least one has the characteristic information of the SDN controller of known northbound interface to described conversation module 110, n SDN control information of conversation module record comprises unique identify label identification code (Identity, ID), controller protocol (Internet Protocol Address, IP) address, controller title and network title etc.In present embodiment, be registered to the characteristic information of the network service in northbound interface connecting system and the characteristic information of SDN controller and record respectively and be stored in network service NameSpace catalogue and controller NameSpace catalogue.
Be understandable that, upper layer network and the SDN of lower floor controller are all dynamic changes, conversation module 110 can irregularly read and revise recorded information, in conversation module 110, use the mode of similar ping to carry out poll with to network service and SDN controller monitoring, according to different SDN protocol specifications, define keep alive message, after network service or SDN controller off-line, conversation module 110 can be deleted the information of respective record automatically in corresponding NameSpace catalogue, user can be as required by the state of switch under conversation module 110 Query Running Status or certain SDN controller.
Be understandable that, user also can manually add the information of SDN controller as required, SDN controller for unknown protocol, the external interface that user can decontrol according to adaptation engine module 120 carries out secondary development adaptation engine module, according to the interface of decontroling, writes the adaptation engine module that code generates user oneself.
Described adaptation engine module 120 is faced a plurality of upper layer network services and a plurality of lower floors controller and is resolved and process according to the next message of levels.In present embodiment, the northbound interface of adaptation engine module 120 is used the mode of REST API and SOAP API to send message.
When certain network service needs SDN network, adaptation engine module 120 receives the message of this upper layer network service and carries out after dissection process is converted to internal form sending to conversation module 110, after conversation module 110 obtains notice that this upper layer network service registers and network service by respective protocol as the registration of shaking hands of http agreement, return to acknowledge message, now conversation module 110 is recorded to the feature of this network in network service NameSpace catalogue and to this network, sends message for later controller.Meanwhile, a series of requirements such as the message function that conversation module 110 obtains dissection process, parameter, transmission object, the agreement that is assembled into target SDN controller carries out being issued to target SDN controller after format conversion.
Be understandable that, if a plurality of network services will be accessed a plurality of SDN networks, conversation module 110 according to the network characterization of record according to the automatic routing iinformation of the needs of network service to SDN controller, send to different SDN controllers to revise the instruction of stream table with the path of switch forwarding data under change control device, to reach the demand of this network service.If a plurality of network services need be accessed different controllers, the processing of multithreading, if a plurality of network service need be accessed same controller, carries out queue processing.
No matter SDN controller operates in forwarding pattern by the stream table of switch change control device or operating in proactive pattern is the modification that controller is controlled stream table, switch carries out under data retransmission according to the forward-path of stream table definition, native system 100 all can be according to the message that need to forward change control device stream table of upper layer application, if there is the conflict that stream table is revised, native system can return to error message to upper layer application, can't have influence on the forwarding of SDN controller to data.
When SDN controller need send a message to corresponding upper layer network, adaptation engine module 120 is resolved the message of SDN controller transmission and is processed into after the form of upper layer network service identification, then according to the network characterization of the upper layer network service of record, is forwarded to corresponding upper layer network service through conversation module 110.
Be understandable that, while communicating by letter for increasing certain different network service or SDN controller, can write after applicable adaptation engine module these modules of dynamic load when system is moved realizes, for example, certain network of user wants to use the Cisco controller of newly buying, and access its network, the protocol specification of the northbound interface providing according to Cisco forms a jar file after writing the adaptation engine module compiles that is applicable to Cisco SDN network, it is in service that system joins system by this adaptation engine module dynamically, user's network can not need to carry out the SDN network that any modification just can be used Cisco to provide, simultaneously, the SDN network of other manufacturers can be used equally, if want to create the virtual network environment across SDN network, user needs to revise any network settings and topology hardly.
In order to improve efficiency of transmission, native system 100 adopts the mode of short URL or compression xml to transmit data.Whether in native system operation, can regularly to neighbours' system, send keep alive message authentication according to certain hour interval exists and synchro system information mutually.
Refer to Fig. 3, a kind of northbound interface cut-in method based on software defined network that it provides for embodiment of the present invention, the described northbound interface cut-in method based on software defined network is for supporting software defined network (the Software Defined Network of various different agreement standards, SDN) access of controller is so that at least one SDN controller and at least one upper layer network communication for service, and the described northbound interface cut-in method based on software defined network comprises the following steps:
S100: obtain and record the characteristic information in the network characterization of at least one upper layer network service and network with the SDN controller of known northbound interface;
S200: issue after the protocol conversion form according to target SDN controller according to SDN controller characteristic information after receiving the message of at least one upper layer network service and carrying out dissection process;
S300: resolve the message of at least one SDN controller transmission and be processed into the network characterization forwarding of serving according to upper layer network after the form of upper layer network service identification.
In step S100, utilize conversation module 110 to obtain and record the network characterization of upper layer network service and unique ID of SDN controller, controller IP address, title, network title etc.Upper layer network and the SDN of lower floor controller are all dynamic changes, and after network service or SDN controller off-line, conversation module 110 can be deleted the corresponding informance of record automatically.Be understandable that, user also can manually add the information of SDN controller as required, for the SDN controller user of unknown protocol, can carry out secondary development adaptation engine module.
In step S200, utilize adaptation engine module 120 receive the message of certain upper layer network service that needs SDN network and carry out dissection process, after conversation module 110 obtains notice that upper layer network service registers and network service by respective protocol, the feature of this network is recorded in network service NameSpace catalogue and to this network, sends message for controller is convenient later as the http agreement conversation module 110 after registration of shaking hands, simultaneously, the message function that conversation module 110 obtains dissection process, parameter, send a series of requirements such as object, the agreement that is assembled into target SDN controller carries out being issued to target SDN controller after format conversion.
Be understandable that, if a plurality of network service need be accessed different controllers, the processing of multithreading, if a plurality of network service need be accessed same controller, carries out queue processing.No matter SDN controller operates in forwarding pattern or operates under proactive pattern, and native system 100 all can be according to the message that need to forward change control device stream table of upper layer application.
In step S300, utilize adaptation engine module 120 resolve the message of SDN controller transmission and be processed into after the form of upper layer network service identification, then according to the network characterization of the upper layer network service of record, be forwarded to corresponding upper layer network service through conversation module 110.
Be understandable that, the order of step S200 and step S300 can be exchanged.
In northbound interface connecting system and method based on software defined network provided by the invention, the message of utilizing the 120 dissection process upper layer network services of adaptation engine module to communicate by letter with lower floor SDN controller, all upper layer network services are linked in the SDN network of various different agreement standards in the situation that not revising current code and environment, the SDN controller of different agreement is accessible SDN network also, simultaneously, loading due to adaptation engine module 120 capable of dynamics, thereby can support the access of unknown various controller, to SDN controller and the probabilistic space of having reserved of consensus standard development, easy to operate, autgmentability is higher.
Be understandable that, for the person of ordinary skill of the art, can make other various corresponding changes and distortion by technical conceive according to the present invention, and all these change and distortion all should belong to the protection range of the claims in the present invention.
Claims (8)
1. the northbound interface connecting system based on software defined network, it is for supporting software defined network (the Software Defined Network of various different agreement standards, SDN) access of controller is so that at least one SDN controller and at least one upper layer network communication for service, the described northbound interface connecting system based on software defined network comprises the adaptation engine module that a conversation module and at least one capable of dynamic load, described conversation module obtains and records that described in the network characterization of described at least one upper layer network service and network, at least one has the characteristic information of the SDN controller of known northbound interface, described at least one adaptation engine module receives the message of described at least one upper layer network service and carries out after dissection process is converted to internal form sending to described conversation module, described conversation module carries out the message of dissection process to be issued to target SDN controller after format conversion according to the agreement of target SDN controller according to the SDN controller characteristic information of record, the message that described in described at least one adaptation engine module parses, at least one SDN controller sends the form that is processed into upper layer network service identification are forwarded to corresponding upper layer network service by described conversation module according to the network characterization of the upper layer network service of record.
2. the northbound interface connecting system based on software defined network as claimed in claim 1, it is characterized in that, the described northbound interface connecting system based on software defined network can be arranged on allocate in layer, in the server of SDN controller operation or in independent server.
3. the northbound interface connecting system based on software defined network as claimed in claim 1, is characterized in that, the northbound interface of described adaptation engine module is used the mode of REST API and SOAPAPI to send message.
4. the northbound interface connecting system based on software defined network as claimed in claim 1, it is characterized in that, the known northbound interface SDN controller information that has of described conversation module record comprises unique identify label identification code, controller protocol address, controller title and network title etc.
5. the northbound interface connecting system based on software defined network as claimed in claim 1, is characterized in that, described conversation module is automatically deleted the corresponding informance of record after network service or SDN controller off-line.
6. the northbound interface cut-in method based on software defined network, it is for supporting the access of SDN controller of various different agreement standards so that at least one SDN controller and at least one upper layer network communication for service, and the described northbound interface cut-in method based on software defined network comprises the following steps:
Described in obtaining and recording, in the network characterization of at least one upper layer network service and network, there is the characteristic information of the SDN controller of known northbound interface;
After receiving the message of described at least one upper layer network service and carrying out dissection process, according to the SDN controller characteristic information of record, according to the agreement of target SDN controller, carry out being issued to target SDN controller after format conversion;
After the message that described at least one the SDN controller of parsing sends the form that is processed into upper layer network service identification, according to the network characterization of the upper layer network service of record, be forwarded to corresponding upper layer network service.
7. the northbound interface cut-in method based on software defined network as claimed in claim 6, it is characterized in that, the known northbound interface SDN control information that has of recording comprises unique identify label identification code, controller protocol address, controller title and network title etc.
8. the northbound interface connecting system based on software defined network as claimed in claim 6, is characterized in that, obtain and recorded information step in, after network service or SDN controller off-line, automatically the corresponding informance of record is deleted.
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