CN106878090B - Software defined network controller supporting diverse architecture components - Google Patents
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Abstract
The invention relates to a software-defined network controller supporting a diversity architecture component, which comprises at least one network controller of an Open source Open Flow protocol, a controller agent module supports each network controller and can convert the respective northbound application programming interfaces of the different network controllers into the same northbound interface, and a built-in network application module controls at least one Open Flow exchanger outside through the controller agent module and performs network obstacle detection.
Description
Technical Field
The present invention relates to a software defined network, and more particularly, to a software defined network controller supporting a diversified architecture, which can flexibly meet different requirements and has a diversified architecture.
Background
Compared with the existing network mechanism, the software defined network has a control Plane and a Data Plane on network devices, and is dedicated to hardware network devices, and devices provided by different vendors have different settings, and the different devices transmit according to the rfc (request For comments) standard formulated by ietf (the internet engineering Task force).
In the prior art, taiwan patent No. 201605198 discloses an intelligent network management device and a method for managing a network, which includes: an analysis unit, which analyzes the received network packet to determine whether a given event occurs; a processing unit, generating and sending a command to a Software Defined Network (SDN) controller to change a setting of an SDN switch when the analyzing unit determines that the given event occurs; or, chinese patent No. WO105024939 "a distributed controller system in an SDN network environment based on Open Flow". The patent comprises a decision maker module, a Controller resource pool, an Open Flow control server and an Open Flow switch, wherein the decision maker module is the core of the whole system function and is responsible for detecting the operation of an ActiveController, the Controller resource pool is used for collecting all Empty controllers, the Open Flow control server is used for monitoring the load of the Open Flow control server in real time, and the Open Flow switch is used for executing the forwarding function of data.
However, the current software defined network only outlines the separation of the control layer and the data layer, and defines the control layer and the data layer to use the Open Flow protocol as the protocol for communication with each other, and the architecture thereof has not been studied deeply in the following problems: firstly, how to effectively utilize and support multiple open-source software by existing multiple open-source sdn (software Defined networking) controller software so as to avoid the related problems of limitation and unnecessary re-research and development; a second large-scale software-defined network needs a plurality of software-defined network controllers, and how to effectively communicate among the plurality of controllers; thirdly, aiming at the problem of a barrier checking mechanism of the software defined network; fourth, the software defined network has both the physical network device and the virtual network device, and how to perform efficient management and other related problems; in view of the above, it is still necessary to solve the above problems in the actual application of the software defined network.
In view of the drawbacks derived from the conventional approaches, the inventors have earnestly studied and innovated, and after many years of research, succeeded in developing a software-defined network control capable of supporting various architectural components.
Disclosure of Invention
The present invention is directed to a software-defined network controller capable of supporting various architecture components, which can be implemented in various network architectures or scales.
The invention can support the existing software of the switch controller, in addition, when facing the large-scale network scale, the single software-defined network controller can not meet the requirement, and needs to be managed by a plurality of software-defined network controllers, and the communication and the cooperative cooperation among the software-defined network controllers are very important at the moment.
The software defined network controller of the diversified architecture component can effectively manage the software defined network comprising the entity network equipment and the virtual network equipment.
The invention relates to a software defined network controller supporting diversified framework components, which is composed of the following frameworks: the invention comprises one (or more) network controllers, wherein the network controller is a network controller supporting an Open Flow protocol; the present invention further includes a controller agent module, which can support various network controllers, and converts the respective north Application Programming Interfaces (APIs) of the different network controllers into the same north Interface (Northbound Interface).
The invention also comprises a built-in network application module, which controls at least one Open Flow exchanger outside through the controller agent module to check and test network obstacles; in addition, the present invention includes an API server module for collecting network topology information and traffic information in the SDN and managing the peer-to-peer network according to the network topology information and the traffic information.
Finally, the invention includes a database module for storing the network topology information and traffic information collected by the application programming interface server module, the network controller and the built-in network application module are both linked with the database module to obtain the required network topology information and traffic information.
Compared with the prior art, the invention has the following advantages: (1) compared with the traditional architecture, the architecture of the invention can respectively support a plurality of Open Flow controllers with different Open sources, and can also manage a plurality of Open Flow controllers with the same Open source at the same time, thereby providing more flexible selection for users without providing diversified network application services at the same time. (2) The invention can support a hierarchical SDN controller architecture, can be executed in a local area network and a wide area network, and provides different network application modules according to different application fields, for example, network isolation and network control are provided in the local area network, path scheduling and circuit bandwidth management are provided in the wide area network, and the invention has flexible selection. (3) The invention can support a high-availability architecture with one SDN controller in a local area network, can also be applied to the environment of a wide area network/a different place network, and is built into an architecture that a double-level controller/a main controller can manage two places. (4) The invention can be applied to network obstacle detection under the Open Flow local area network of the same network segment, and can also be applied to the Open Flow local area networks of different network segments to carry out network obstacle detection among different local area networks.
Drawings
FIG. 1 is a conceptual architecture diagram of a software defined network;
FIG. 2 is a system architecture diagram of a software defined network controller supporting diverse architecture components in accordance with the present invention;
FIG. 3 is a diagram of a system architecture of the present invention supporting a variety of different power controllers;
FIG. 4 is a diagram of a system architecture of the present invention supporting a plurality of identical power controllers;
FIG. 5 is a diagram of a system architecture supporting a hierarchical software defined network controller according to the present invention;
FIG. 6 is a diagram of a system architecture supporting a SDN plus one high availability network controller according to the present invention;
FIG. 7 is a system architecture diagram of the present invention supporting a dual-level controller or master controller to manage a two-site network;
FIG. 8 is a system architecture diagram of the present invention supporting network discovery in the same network segment;
FIG. 9 is a system architecture diagram of the present invention supporting network discovery in different network segments.
Description of reference numerals:
11 network application module
12 north interface
13 software defined network controller
14 southward pointing interface
15 software-defined network switch
17 Open Flow exchanger
18 Open Flow protocol
19 first Open Flow controller
20 second Open Flow controller
21 controller agent module
22 built-in network application module
23 database module
24 first application programming interface
25 second application programming interface
26 Server
27 host server
28 pairs of servers
29 application programming interface server
30 master controller
31 sub-controllers
32 first Open Flow local area network
33 second Open Flow local area network
Detailed Description
The invention can support various Open source Open Flow controllers and hierarchical architectures, and has the function of checking and testing network fault by software definition; the invention provides diversified network application services except a built-in network function application module, also has a universal northbound Application Programming Interface (API), can provide related equipment of a network defined by external application programs through the universal northbound application programming interface control software, and actually constructs a network architecture environment with a network control plane and a forwarding plane separated.
The present invention will be described with reference to the drawings, wherein fig. 1 is a basic architecture diagram of a software-defined network, and a software-defined network controller 13 utilizes, for example, an Open Flow protocol 18 via a standard southbound interface 14, so that a single software-defined network controller 13 can control a plurality of software-defined network switches 15; however, the north interface 12 lacks a common interface, because different SDN controllers 13 have different north interfaces 12, the related network application modules 11 need to be re-developed to interface with each other according to the requirements of different SDN controllers 13.
FIG. 2 is a system architecture diagram of a software-defined network controller supporting multiple architecture components according to the present invention, which includes: a first Open Flow controller 19, a controller agent module 21, a built-in network application module 22, a database module 23 and an application programming interface server 29; the first Open Flow controller 19 is an Open-source Open Flow controller, and the present invention can also be configured with a plurality of same or different Open-source Open Flow controllers 19, and the present invention provides a universal northbound interface 12 to an external network application module 11 through a controller agent module 21, or directly provides the northbound interface to a built-in network application module 22.
The built-in network application module 22 of the present invention includes a network checking function, a network topology, traffic statistics, and other functions, and the external network application module 11 can obtain the relevant information of the built-in network application module 22 through the universal northbound interface 12, for example, obtain the network topology information or perform network obstacle checking; the database module 23 of the present invention is also used to store information of the external Open Flow switch 17, network topology information, Host (Host) information, Flow entry information (FlowEntry), traffic volume, etc., which can be obtained by the external network application module 11 or the built-in network application module 22.
The api server 29 of the present invention is used to provide a hierarchical architecture, wherein the upper-layer network controller communicates with the api server 29 of the lower-layer network controller through the controller agent module 21 to obtain the overall network topology and related information across the network controllers.
The software defined network controller supporting multiple architecture components of the present invention can support multiple Open-source controllers, as shown in the schematic diagram of fig. 3, and through the controller agent module 21 of the present invention, the present invention can respectively manage different Open-source OpenFlow controllers, such as the first Open Flow controller 19 and the second Open Flow controller 20; when the built-in network application module 22 of the present invention needs to control the first Open Flow controller 19, the controller agent module 21 of the present invention converts the control parameters into the first application programming interface 24 corresponding to the first Open Flow controller 19 and the parameters thereof, and the first Open Flow controller 19 instructs the external Open Flow switch 17 to execute the task according to the parameters, and after the execution is finished, converts the data returned by the Open Flow switch 17 into the corresponding format and provides the data to the built-in network application module 22.
Similarly, when the on-board network application module 22 of the present invention needs to control the second Open Flow controller 20, it converts the control parameters into the second application programming interface 25 and parameters corresponding to the second Open Flow controller 20 through the controller agent module 21 of the present invention, and the second Open Flow controller 20 instructs the external Open Flow switch 17 to execute tasks according to the parameters; for the on-board network application modules 22, they communicate with the controller agent module 21 through a unified interface, and do not need to consider or respond to different Open source Open Flow controller interfaces.
In addition, through the controller agent module 21 of the present invention, not only the first application programming interface 24 and the second application programming interface 25, which are different, are converted to control the first Open Flow controller 19 and the second Open Flow controller 20, respectively, but also a continuous application programming interface instruction can be executed; for example, in a general situation, the built-in network application module 22 needs to first request the first Open Flow controller 19 for available path information, after the execution is finished, the first Open Flow controller 19 returns the available path information to the built-in network application module 22, and the built-in network application module 22 needs to initiate a request for establishing a path to the first Open Flow controller 19 again; in the present invention, the built-in network application module 22 can directly provide the controller agent module 21 with the required peer-to-peer parameters, such as the source IP address, the destination IP address or the guaranteed bandwidth information, and the user can achieve the implementation of the abstract function only by executing the parameters or commands that are continuously in line with the requirements of the first Open Flow controller 19 without knowing the details of the parameters or commands.
The present invention can support a plurality of different Open source Open Flow controllers, and can also support a plurality of same Open source Open Flow controllers, as shown in fig. 4, the first Open Flow controller 19 is taken as an example, as shown in fig. 4, as the number of the managed plurality of external Open Flow switches 17 increases, the present invention can correspondingly increase the number of the first Open Flow controllers 19 step by step, even if the present invention has extensibility, so that the built-in network application module 22 can provide diverse network services; in addition, the controller agent module 21 can integrate the resources of a plurality of first Open Flow controllers 19 to obtain the information of the overall network topology, and each of the first Open Flow controllers 19 can be disposed in different fields to manage the Open Flow switches 17 of different fields, for example: an external local area network or wide area network Open Flow switch 17.
The software defined network controller supporting the diversified architecture components of the present invention can also support a hierarchical software defined network controller architecture, as shown in fig. 5, the present invention is applied to a domain of a large software defined network for centralized management of an SDN network; wherein, the upper layer software-defined network controller communicates with the application programming interface server 29 of the lower layer software-defined network controller through the controller agent 21, which can obtain the whole network topology and related information of the cross software-defined network controller, and can manage the network end-to-end network path and circuit bandwidth accordingly; through the hierarchical architecture, the invention can be used for simultaneously managing the local area network and the wide area network and monitoring and managing the end-to-end network quality so as to provide high-quality network service; the present invention can provide different network application modules according to different field areas, can provide network isolation and network control functions in a local area network, and can provide path scheduling and circuit bandwidth management in a wide area network.
The present invention can also support a high availability architecture (HA) of the network controller in the local area network, as shown in fig. 6, the architecture can perform a backup operation according to the availability requirement, so that when the device fails, the backup device can immediately continue to provide service, thereby reducing the time for service interruption; in order to realize the function, the invention has a server master-slave type standby mechanism, so that the slave secondary server 28 can provide the service when the master server 27 can not provide the service; that is, when the main server 27 cannot provide services, the Open Flow switch 17 under its control cannot obtain the control information, and according to the mechanism of the Open Flow protocol, the Open Flow switch 17 automatically searches for the control information (i.e., the sub-server 28) sought by the upper layer controller, so as to achieve the purpose of continuously providing services from the backup controller without manual switching, thereby reducing the service interruption time.
Since the present invention can provide a hierarchical architecture through the software-defined network controller and can be built into a complex architecture for two-site control with a dual-level controller (or a master controller) in a wide area network (or a foreign network) environment through the flexible deployment mode of the high-availability architecture, as shown in fig. 7; the main controller 30 may control the sub-controller 31 in the different-place network in addition to the controller (server 26) under it, so as to achieve a large-area network control architecture of the dual-level controller, wherein the server 26 under the control of the main controller 30 and the controlled Open Flow switch 17 employ a plus-one HA backup architecture as shown in fig. 6, which extends upward, that is, the main controller 30 and the server 26 are both built in a plus-one backup manner, and the architecture of the sub-controller 31 in the different-place network is the same, so that the whole is a double-level controller (or main controller) of the different-place network implemented in a plus-one high-availability architecture from bottom to top, so as to manage the complete SDN control architecture of the two-place network.
The present invention can also support various network inspection and testing architectures, as shown in fig. 8, wherein the built-in network application module 22 has a network inspection and testing function, so as to solve the problem that it is difficult for a network administrator to effectively detect the network state and debug the network due to the characteristic that each network component determines the forwarding behavior; the built-in network application module 22 of the present invention provides a special obstacle detection packet through the first OpenFlow controller 19, sends a detection obstacle detection packet to the switch at the start point of the network to be detected, sets an interception point in each Open Flow switch in the first Open Flow lan 32, and copies a copy of the obstacle detection packet to the first Open Flow controller 19 to report back the state after each segment of the network link flows through the OpenFlow switch by using the programmable characteristics of the OpenFlow switch, so that the present invention can confirm the complete path information of the packet flowing through the network to quickly obtain the information where the obstacle circuit occurs.
In addition, the present invention can be applied to the first Open Flow lan 32 in the same network segment, and also can be applied to the first Open Flow lan 32 and the second Open Flow lan 33 in different network segments, so as to check and test network obstacles between different lans, as shown in fig. 9; in the conventional technology, the network obstacle test across network segments needs to provide a routing state through a router, which causes a large amount of test packets to be transmitted in the network, and additionally increases the network bandwidth burden.
In conclusion, the present invention is an innovation in technical idea, has many functions which are beyond the prior art, fully meets the legal patent requirements of novelty and advancement, and is applied to patent applications by law, and the noble office is solicited to approve the patent application to excite the invention.
Claims (10)
1. A software defined network controller supporting diverse architecture components, comprising:
at least one network controller, which is an Open source Open Flow protocol controller;
the controller agent module supports each network controller, and converts the application programming interface in the north direction of each different network controller into the same north direction interface;
a built-in network application module, which controls at least one Open Flow exchanger outside through the controller agent module and tests network obstacles;
an application programming interface server module, which is used for collecting network topology information and traffic volume information in the software defined network and managing an end-to-end network according to the network topology information and the traffic volume information; and
and the network controller and the built-in network application module are both linked with the database module to acquire the required network topology information and the traffic information.
2. The software-defined network controller supporting diverse architecture components of claim 1, wherein the fault detection by the built-in network applications module comprises network detection, network topology, and traffic statistics.
3. The software-defined network controller that supports diverse architecture components of claim 1, wherein the database module stores information including each Open Flow switch information, network host information, Flow entry information, and network traffic information.
4. The network controller of claim 1, wherein the unified northbound interface is configured to manage each network controller separately via the controller agent module.
5. The software-defined network controller supporting diverse architecture components of claim 1, wherein the controller agent module is capable of executing successive API instructions to translate network source IP addresses, destination IP addresses and guaranteed bandwidth information provided by the built-in network application module into successive parameters and commands required by each of the controllers to ensure the operation of network abstraction.
6. The network controller supporting diverse architecture components of claim 1, wherein the controller agent module manages each of the controllers of the same nature to integrate the resources of each of the controllers to obtain overall network topology information.
7. A software defined network controller supporting diverse architecture components as claimed in claim 1, applicable to a large field of software defined network for centralized management of SDN network, wherein an upper layer SDN controller linked with the api server module of a lower layer SDN controller through the controller agent module can obtain overall network topology information across SDN controllers for managing and monitoring peer-to-peer network.
8. The SDN controller supporting diverse architecture components as recited in claim 1, wherein the SDN controller is a high availability architecture for providing redundancy services in a local area network to provide redundancy on demand to reduce service outage time in case of failure.
9. The network controller of claim 1, wherein the network controller is configured to be controlled by a dual-level controller or a host controller in a wide area network or a foreign network.
10. The network controller as claimed in claim 1, wherein the built-in network application module sends a special barrier detection packet to the switch at the start of the network to be detected through each controller, and sets a interception point in each Open Flow switch in the local area network, so that each barrier detection packet is copied and returned to each controller for returning status after flowing through a segment of network link by using the programmable characteristic of each Open Flow switch, thereby confirming the complete path information of the barrier detection packet flowing through the network and obtaining the information of the circuit where the barrier occurs in real time.
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| TW105124389A TWI623223B (en) | 2016-08-02 | 2016-08-02 | Software-defined network controller supporting diverse architecture components |
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| CN107483259B (en) * | 2017-08-25 | 2018-10-23 | 广州西麦科技股份有限公司 | SDN controller middleware control methods based on MD-SAL and system |
| CN107395444A (en) * | 2017-09-06 | 2017-11-24 | 郑州云海信息技术有限公司 | One kind is based on SDN controller failures recovery system and method |
| TWI692224B (en) * | 2018-12-03 | 2020-04-21 | 中華電信股份有限公司 | Communication system and fault location method thereof |
| WO2020255364A1 (en) * | 2019-06-21 | 2020-12-24 | 日本電信電話株式会社 | Plug-in generation device, controller, plug-in generation method, and plug-in generation program |
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| CN106878090A (en) | 2017-06-20 |
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