CN108600028B - Functional SDN northbound interface system suitable for heterogeneous industrial network and implementation method - Google Patents
Functional SDN northbound interface system suitable for heterogeneous industrial network and implementation method Download PDFInfo
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Abstract
The invention relates to a functional SDN northbound interface system suitable for a heterogeneous industrial network and an implementation method, and belongs to the technical field of industrial networks. On the basis of fully considering the service characteristics of the industrial network, the network resources of the industrial wireless network are intensively abstracted to the virtual resource pool, and the virtualized resources of the industrial wireless network and the industrial backhaul network are uniformly arranged and integrated and managed through the resource arranging unit, so that a basis is provided for the function opening of the northbound interface. The functional SDN northbound interface system designed by the invention can flexibly provide two levels of functional northbound interfaces of an industrial wireless network functional interface and a fusion management interface for an upper network manager, and meanwhile, when a new network is accessed, the system only needs to make modification on a software level, so that the system has higher expandability.
Description
Technical Field
The invention belongs to the technical field of industrial networks, and relates to a functional SDN northbound interface system suitable for a heterogeneous industrial network and an implementation method.
Background
With the increasing maturity of wireless network communication technology, industrial wireless networks are gradually permeating into the industrial field, and the development trend from information acquisition to production control, from local schemes to full-network schemes is presented. However, due to the complex industrial field environment, the limited coverage of the industrial wireless network, the strict requirements on the reliability and stability of the network, and the like, a plurality of industrial wireless networks and various wired networks are usually deployed in one factory to realize the network coverage of the whole factory, which makes the convergence management between heterogeneous industrial networks difficult.
An SDN (Software Defined Network ) is an emerging Network architecture in the internet field, and is an implementation manner of Network virtualization. The standard southbound interface is defined for abstract modeling of switches, routers and other equipment of a network infrastructure layer, so that a control plane in each individual network equipment is extracted into a control layer in a centralized manner, and the 'intellectualization' of bottom forwarding equipment and the virtualization of network resources are realized. Meanwhile, the control plane can configure the underlying network resources in real time through the southbound interface, thereby realizing the programmability of the switch and enhancing the network flexibility.
The northbound interface is used as an important link between the application layer and the control layer, and mainly aims to flexibly configure the underlying network in real time for the convenience of upper-layer application and simultaneously achieve the purpose of shielding complex network configuration flows and network differences so as to further open the capabilities of the underlying network and the controller. However, for heterogeneous industrial networks composed of industrial wireless networks, industrial backhaul networks, and the like, it is difficult for the current northbound interface to flexibly configure the underlying industrial network. Therefore, a functional SDN northbound interface system with high expansibility and flexibility is designed, the heterogeneous industrial network basic function and the fusion management function are opened, and the method has important significance for service upgrading and deployment of the industrial network and further network innovation.
Disclosure of Invention
In view of this, the present invention aims to provide a functional SDN northbound interface system suitable for a heterogeneous industrial network and an implementation method thereof, which are oriented to a cross-domain and cross-factory industrial wireless network to implement network resource virtualization, and uniformly integrate and arrange network resources of each domain, break through data resource gaps between heterogeneous industrial networks, and implement fusion management of heterogeneous network resources. Meanwhile, two types of northbound interfaces are opened for a network manager on the basis: the system comprises a function management interface facing an industrial wireless network and a convergence management interface facing a heterogeneous industrial network.
In order to achieve the purpose, the invention provides the following technical scheme:
the functional SDN northbound interface system is suitable for a heterogeneous industrial network, and is designed based on network resource virtualization and SDN centralized management on the basis of fully considering industrial network service characteristics and interface opening capacity; the system comprises three parts: the device comprises an industrial wireless network virtual resource pool, an industrial backhaul network virtual resource and a northbound interface resource arranging unit; the north interface resource arrangement unit comprises an event module and a north interface function management module, and the modules and the units have the following relations:
(1) the industrial wireless network virtual resource pool is a centralized processing of network resources such as routing information, link information, superframe information, virtual communication relation, equipment state and the like in the same type of industrial wireless networks at the bottom layer, so that each type of industrial wireless network is intensively mapped into an independent virtual network resource pool;
(2) the northbound interface resource arrangement unit integrates and arranges the virtual resources of the industrial wireless network and the industrial backhaul network, and generalizes the resources into various northbound interface function management modules according to the service categories;
(3) the northbound interface function management module is responsible for performing service analysis, decision and response on a northbound interface request initiated by a network manager, and is divided into 5 types according to service function types: the system comprises an industrial wireless network resource management module, an equipment information management module, a network information management module, a cross-network scheduling management module and a flow scheduling management module.
Based on the system, the specific implementation process of the industrial wireless network function management interface comprises the following steps:
s101: a resource arranging unit receives a northbound interface calling request sent by a network manager;
s102: the northbound interface event mechanism distributes the request event to the corresponding northbound interface function management module according to the function type;
s103: the northbound interface function management module analyzes the northbound interface request information and judges whether the request meets the actual deployment specification or not according to the service requirement of the northbound interface and the constraint condition of the bottom layer industrial network; if not, returning the request constraint condition to the network manager, if yes, executing S104;
s104: the northbound interface function management module analyzes the network resources to be called according to the service requirements, and because the network information in the industrial wireless network resource pool is updated and maintained in real time, if the network information is an information acquisition request, the northbound interface function management module directly calls related network resources to construct northbound interface response information; if the request is a network configuration request which comprises industrial wireless network link, route and superframe configuration, configuring an underlying network and waiting for configuration state reply information;
s105: after receiving the configuration state reply information of the bottom layer industrial network, the northbound interface function management module analyzes and identifies the content of the returned information according to the service requirement; if the return information is not received, returning configuration error information to the network manager;
s106: the northbound interface function management module constructs northbound interface response information and feeds back a request result to a network manager.
Further, the industrial wireless network function management interface comprises: the method comprises the steps of obtaining and configuring routing information, obtaining and configuring link information, obtaining and configuring superframe information, obtaining an address translation table of industrial wireless network equipment, obtaining topology information, obtaining an equipment list, obtaining routing equipment information, obtaining sensor equipment information and obtaining link quality information.
Based on the system, the specific implementation process of the heterogeneous industrial network convergence management interface comprises the following steps:
s201: a resource arranging unit receives a northbound interface calling request sent by a network manager;
s202: the northbound interface event mechanism distributes the request event to the corresponding northbound interface function management module according to the function type;
s203: the northbound interface function management module analyzes the northbound interface request information and judges whether the request meets the actual deployment specification or not according to the service requirement of the northbound interface and the constraint condition of the bottom layer industrial network; if not, returning the request constraint condition to the network manager, if yes, executing S204;
s204: the northbound interface function management module analyzes the network resources required to be called according to the service requirements; if the request is the request for acquiring the information, related network resources are directly called, and northbound interface response information is constructed; if the request is a request for configuring the network class, further configuration is waited for;
s205: the northbound interface function management module calls industrial backhaul network resources, calculates an optimal path according to service requirements, generates information such as flow table configuration and the like, issues the information to a relevant switch, and waits for configuration state reply information;
s206: the northbound interface function management module calls network resources of the industrial wireless network, calculates information such as a route, a link, a superframe and the like according to business requirements, constructs a calculation result into a frame format which accords with the specific industrial wireless network, sends the frame format to the industrial wireless network, and waits for configuration state reply information;
s207: after receiving the configuration state reply fed back by the bottom layer industrial network, the northbound interface function management module screens and checks the returned information by combining the service requirements, and selects an optimal scheme; if the return information is not received, returning configuration error information to the network manager;
s208: the northbound interface function management module constructs northbound interface response information and feeds back a request result to a network manager.
Further, the heterogeneous industrial network convergence management interface includes, but is not limited to, the following 3 types: cross-network scheduling configuration, cross-network scheduling state acquisition and traffic scheduling configuration.
The cross-network scheduling can realize the scheduling of the industrial wireless network data flow in an industrial return network; by calling the interface, the deterministic scheduling from end to end between cross-domain networks can be realized;
the cross-network scheduling state acquisition interface can check information such as paths, packet quantity and the like of data streams currently being scheduled;
the flow scheduling configuration can adjust the optimal path of subsequent scheduling in real time according to the network flow of each switch node in the industrial backhaul network, so as to avoid network congestion; by calling the flow scheduling configuration interface, the network flow factor can be considered when a scheduling path is selected, but the process is automatically completed by the flow scheduling management module and cannot be adjusted by the external factor of a network manager.
The invention has the beneficial effects that:
(1) aiming at the problem that the network function of the industrial wireless network is relatively closed, the invention provides a northbound interface system suitable for the industrial wireless network based on SDN on the basis of fully considering the opening capability and the service characteristics of the industrial network interface, and supports the management configuration of the industrial wireless network. The interface can shield complex and complicated network protocols, resource configuration and other flows, provides network resources for upper-layer application in a more abstract interface form, enables upper-layer network managers not to need to understand various complex network configuration flows in a controller and an underlying network, and manages and controls global network resources more conveniently and rapidly.
(2) Aiming at the problem that the configuration process of the convergence management function in the heterogeneous network formed by the cross-domain industrial wireless network and the industrial backhaul network is complex, the invention provides an open scheme of the convergence management northbound interface, which supports the convergence management configuration of the industrial wireless network and the industrial backhaul network. The interface is a high-level northbound interface with an optimal scheme of self-adaptive adjustment and self-screening, and can enable an upper network manager to conveniently configure the functions of the underlying network with lower learning cost, accelerate the deployment speed of cross-network services and reduce the network operation and maintenance cost.
(3) The functional SDN northbound interface system suitable for the heterogeneous industrial network can realize network resource virtualization and unified arrangement of an industrial wireless network and an industrial backhaul network, and is beneficial to promoting data fusion between the heterogeneous industrial networks.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
fig. 1 is a diagram of a heterogeneous network convergence management structure;
FIG. 2 is a model diagram of a north interface system;
FIG. 3 is a north interface resource orchestration machine diagram;
FIG. 4 is a flow chart of an industrial wireless network northbound interface implementation;
FIG. 5 is a flow diagram of a convergence management northbound interface implementation;
FIG. 6 is a flow chart of north interface interaction.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be noted that, although the functional SDN northbound interface system and implementation scheme applicable to the heterogeneous industrial network according to the present invention are described in terms of a heterogeneous network formed by an industrial backhaul network and an industrial wireless network, the method and system model of the present invention are also applicable to heterogeneous networks formed by other industrial networks.
In this embodiment, the design scheme of the functional northbound interface system will be detailed in three aspects of the heterogeneous network convergence management structure, the northbound interface system model and the northbound interface implementation flow, and finally, a specific design format of the northbound interface will be exemplified.
Description of heterogeneous network convergence management structure
Fig. 1 is a heterogeneous industrial network convergence management network structure, on which all processes and methods of this embodiment are based, and a management core of the structure is located in a centralized industrial SDN controller in a control layer.
The heterogeneous network convergence management structure is mainly divided into three planes, which are respectively:
(1) infrastructure plane: including SDN switches of industrial backhaul networks and various sensor devices, routing devices, and gateway devices of industrial wireless networks. In the structure, the basic implementation plane needs to complete the data forwarding, protocol conversion and other works of the underlying network, and the networking, configuration and other works of each network are completed by issuing control decisions by a centralized SDN controller.
(2) A control plane: the system only comprises a centralized industrial SDN controller, the controller is a novel SDN controller which can have a fusion management function on an industrial wireless network and an industrial backhaul network, and northbound interface implementation modules such as a resource arrangement unit and a virtual network resource pool are all implemented in the controller.
(3) Application plane: and various application management software comprising an oriented industrial wireless network and an industrial backhaul network.
Two, north interface system model description
FIG. 2 is a model of a north interface system, which includes three modules: the system comprises an industrial wireless network virtual resource pool, an industrial backhaul network virtual resource pool and a northbound interface resource arranging unit. Fig. 3 is an implementation mechanism of a resource scheduling unit, where the northbound interface resource scheduling unit includes an event module and a northbound interface function management module, and the northbound interface function management module may be divided into 5 types according to service types: the system comprises an industrial wireless network resource management module, an equipment information management module, a network information management module, a cross-network scheduling management module and a flow management module. The modules and units have the following relations:
(1) the virtual network resource pool is a centralized processing of network resources such as routing information, link information, superframe information, virtual communication relation, equipment state and the like in the same type of industrial wireless network at the bottom layer;
(2) the resource arranging unit is used for inducing and arranging virtual resources of an industrial wireless network and an industrial return network and comprises various northbound interface function management modules, a northbound interface event distribution mechanism and a northbound interface event response mechanism;
(3) the northbound interface function management module is mainly responsible for performing service analysis, decision and response on a northbound interface request initiated by a network manager, and is divided into 5 types according to service function types: the system comprises an industrial wireless network resource management module, an equipment information management module, a network information management module, a cross-network scheduling management module and a flow management module.
Third, design flow of functional northbound interface
Fig. 4 is an implementation flow of an industrial wireless network interface, and a specific response flow and configuration process includes the following steps:
s1: a resource arranging unit receives a northbound interface calling request sent by a network manager;
s2: the northbound interface event mechanism distributes the request event to the corresponding northbound interface function management module according to the function type;
s3: and the northbound interface function management module analyzes the northbound interface request information and judges whether the request meets the actual deployment specification or not according to the service requirement of the northbound interface and the constraint condition of the bottom layer industrial network. If not, returning the request constraint condition to the network manager, if yes, executing S4;
s4: the northbound interface function management module analyzes the network resources required to be called according to the service requirements, and because the network information in the industrial wireless network resource pool is updated and maintained in real time, if the network information is an information acquisition request, the northbound interface function management module directly calls related network resources to construct northbound interface response information. If the request is a request for configuring network types, such as industrial wireless network links, routing, superframe configuration and the like, configuring an underlying network, and waiting for configuration state reply information;
s5: after receiving the configuration state reply information of the bottom layer industrial network, the northbound interface function management module analyzes and identifies the content of the returned information according to the service requirement. If the return information is not received, returning configuration error information to the network manager;
s6: the northbound interface function management module constructs northbound interface response information and feeds back a request result to a network manager.
Fig. 5 is a fusion management interface implementation flow, and the specific response flow and configuration process includes the following steps:
s1: a resource arranging unit receives a northbound interface calling request sent by a network manager;
s2: the northbound interface event mechanism distributes the request event to the corresponding northbound interface function management module according to the function type;
s3: and the northbound interface function management module analyzes the northbound interface request information and judges whether the request meets the actual deployment specification or not according to the service requirement of the northbound interface and the constraint condition of the bottom layer industrial network. If not, returning the request constraint condition to the network manager, if yes, executing S4;
s4: and the northbound interface function management module analyzes the network resources required to be called according to the service requirements. If the request is the request for obtaining the information class, related network resources are directly called, and response information of the northbound interface is constructed. If the request is a request for configuring the network class, further configuration is waited for;
s5: the northbound interface function management module calls industrial backhaul network resources, calculates an optimal path according to service requirements, generates information such as flow table configuration and the like, issues the information to a relevant switch, and waits for configuration state reply information;
s6: the northbound interface function management module calls industrial wireless network resources, calculates information such as routes, links, superframes and the like according to business requirements, constructs a calculation result into a frame format which accords with a specific industrial wireless network, and transmits the frame format to the industrial wireless network. And waiting for configuration state reply information;
s7: after receiving the configuration state reply fed back by the bottom layer industrial network, the northbound interface function management module screens and checks the returned information according to the service requirement, and selects an optimal scheme. If the return information is not received, returning configuration error information to the network manager;
s8: the northbound interface function management module constructs northbound interface response information and feeds back a request result to a network manager.
Further, the network administrator refers to an actual caller of the northbound interface, does not specifically refer to the network administrator, and may be various application management software or network maintenance personnel.
Furthermore, the northbound interface function management module is located in the resource arranging unit and is a core module for actually processing the northbound interface request.
Further, the virtualization process of the industrial backhaul network follows OpenFlow specifications and SDN standard architecture, and the method does not describe the virtualization process of the industrial backhaul network.
Four, function type north interface design example
The embodiment will be illustrated in a manner of describing a north interface in detail by using REST related technology.
Fig. 6 is a north-bound interface interaction flow based on REST, which generally describes a relationship between a network manager and a network provider, that is, after receiving a north-bound interface request, the network provider locates a required Resource by using a URL (Uniform Resource Locator), and finally calls a north-bound interface function management module to perform service analysis, decision and response.
Table 1 details the contents of two types of northbound interfaces, namely, an industrial wireless network API and a convergence management API, and describes resource identifiers and resource operation types corresponding to the various types of northbound interfaces, where the interfaces implement corresponding resource acquisition, modification, setting, and deletion operations by using GET, PUT, POST, and DELETE methods provided by the HTTP protocol.
TABLE 1 northbound interface resource identifier detail
The following description will be made by citing an interface for acquiring routing information of an industrial wireless network, where the interface locates information to be acquired by using a GET method in an HTTP protocol through a/NetworkID/DeviceAddress/routers identifier in a URL. And after receiving the request message and performing relevant processing, a resource arranging unit in the centralized industrial SDN controller converts the reply message into a JSON format and feeds back the JSON format. The specific northbound interface request and response messages are shown in table 2:
TABLE 2 northbound interface request and response messages
Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the invention, and that, although the invention has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (5)
1. Functional SDN northbound interface system suitable for heterogeneous industrial network, its characterized in that: the system is a northbound interface system based on network resource virtualization and SDN centralized management designed on the basis of fully considering industrial network service characteristics and interface opening capacity; the system comprises three parts: the device comprises an industrial wireless network virtual resource pool, an industrial backhaul network virtual resource and a northbound interface resource arranging unit; the north interface resource arrangement unit comprises an event module and a north interface function management module, and the industrial wireless network virtual resource pool is in signal connection with the north interface resource arrangement unit; the industrial backhaul network virtual resource is in signal connection with the northbound interface resource arranging unit;
the event module and the northbound interface function management module are respectively in signal connection with the northbound interface resource arranging unit;
the modules and units have the following relations:
(1) the industrial wireless network virtual resource pool is a centralized processing of network resources such as routing information, link information, superframe information, virtual communication relation, equipment state and the like in the same type of industrial wireless networks at the bottom layer, so that each type of industrial wireless network can be intensively mapped into an independent virtual network resource pool;
(2) the northbound interface resource arrangement unit integrates and arranges the virtual resources of the industrial wireless network and the industrial backhaul network, and generalizes the resources into various northbound interface function management modules according to the service categories;
(3) the northbound interface function management module is responsible for performing service analysis, decision and response on a northbound interface request initiated by a network manager, and can be divided into 5 types according to service function types: the system comprises an industrial wireless network resource management module, an equipment information management module, a network information management module, a cross-network scheduling management module and a flow scheduling management module; the industrial wireless network resource management module, the equipment information management module, the network information management module, the cross-network scheduling management module and the flow scheduling management module are respectively in signal connection with the northbound interface function management module.
2. A method for implementing a function management interface suitable for an industrial wireless network based on the system of claim 1, wherein: the method comprises the following steps:
s101: a resource arranging unit receives a northbound interface calling request sent by a network manager;
s102: the northbound interface event mechanism distributes the request event to the corresponding northbound interface function management module according to the function type;
s103: the northbound interface function management module analyzes the northbound interface request information and judges whether the request meets the actual deployment specification or not according to the service requirement of the northbound interface and the constraint condition of the bottom layer industrial network; if not, returning the request constraint condition to the network manager, if yes, executing S104;
s104: the northbound interface function management module analyzes the network resources to be called according to the service requirements, and because the network information in the industrial wireless network resource pool is updated and maintained in real time, if the network information is an information acquisition request, the northbound interface function management module directly calls related network resources to construct northbound interface response information; if the request is a network configuration request which comprises industrial wireless network link, route and superframe configuration, configuring an underlying network and waiting for configuration state reply information;
s105: after receiving the configuration state reply information of the bottom layer industrial network, the northbound interface function management module analyzes and identifies the content of the returned information according to the service requirement; if the return information is not received, returning configuration error information to the network manager;
s106: the northbound interface function management module constructs northbound interface response information and feeds back a request result to a network manager.
3. The method for implementing the function management interface of the industrial wireless network as claimed in claim 2, wherein: the northbound interface comprises: the method comprises the steps of obtaining and configuring routing information, obtaining and configuring link information, obtaining and configuring superframe information, obtaining an address translation table of industrial wireless network equipment, obtaining topology information, obtaining an equipment list, obtaining routing equipment information, obtaining sensor equipment information and obtaining link quality information.
4. The system of claim 1, wherein the method is applied to implement a convergence management interface of heterogeneous industrial networks, and comprises the following steps: the method comprises the following steps:
s201: a resource arranging unit receives a northbound interface calling request sent by a network manager;
s202: the northbound interface event mechanism distributes the request event to the corresponding northbound interface function management module according to the function type;
s203: the northbound interface function management module analyzes the northbound interface request information and judges whether the request meets the actual deployment specification or not according to the service requirement of the northbound interface and the constraint condition of the bottom layer industrial network; if not, returning the request constraint condition to the network manager, if yes, executing S204;
s204: the northbound interface function management module analyzes the network resources required to be called according to the service requirements; if the request is the request for acquiring the information, related network resources are directly called, and northbound interface response information is constructed; if the request is a request for configuring the network class, further configuration is waited for;
s205: the northbound interface function management module calls industrial backhaul network resources, calculates an optimal path according to service requirements, generates information such as flow table configuration and the like, issues the information to a relevant switch, and waits for configuration state reply information;
s206: the northbound interface function management module calls network resources of the industrial wireless network, calculates information such as a route, a link, a superframe and the like according to business requirements, constructs a calculation result into a frame format which accords with the specific industrial wireless network, sends the frame format to the industrial wireless network, and waits for configuration state reply information;
s207: after receiving the configuration state reply fed back by the bottom layer industrial network, the northbound interface function management module screens and checks the returned information by combining the service requirements, and selects an optimal scheme; if the return information is not received, returning configuration error information to the network manager;
s208: the northbound interface function management module constructs northbound interface response information and feeds back a request result to a network manager.
5. The method for implementing a convergence management interface suitable for the heterogeneous industrial network according to claim 4, wherein:
the cross-network scheduling can realize the scheduling of the industrial wireless network data flow in an industrial return network; by calling a cross-network scheduling configuration interface, end-to-end deterministic scheduling between cross-domain networks can be realized; calling a cross-network scheduling state acquisition interface, and checking related information of a currently scheduled data stream;
the flow scheduling configuration can adjust the optimal path of subsequent scheduling in real time according to the network flow of each switch node in the industrial backhaul network, so as to avoid network congestion; by calling the flow scheduling configuration interface, the network flow factor can be considered when a scheduling path is selected, but the process is automatically completed by the flow scheduling management module and cannot be adjusted by the external factor of a network manager.
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