WO2022205905A1

WO2022205905A1 - Software defined network controller network and interaction method therefor, and storage medium

Info

Publication number: WO2022205905A1
Application number: PCT/CN2021/128586
Authority: WO
Inventors: 李佳聪; 吕航; 王镇宇
Original assignee: 中国电信股份有限公司
Priority date: 2021-03-30
Filing date: 2021-11-04
Publication date: 2022-10-06
Also published as: CN115150393A

Abstract

The present invention relates to the technical field of software defined networks (SDNs), and provides an SDN controller network and an interaction method therefor, and a storage medium. The interaction method for an SDN controller network in the present invention comprises: an SDN controller node in a central state in the SDN controller network generates a block according to acquired information, and chains the block, wherein the SDN controller network is a blockchain network, and the SDN controller node in the central state is determined according to an amount of available resources of SDN controller nodes in the SDN controller network; an SDN controller node in a non-central state in the SDN controller network obtains and stores the block; and the SDN controller nodes in the SDN controller network re-determine the SDN controller node in the central state according to the amount of available resources of the SDN controller nodes in the SDN controller network. By means of such a method, the reliability of a distributed SDN controller can be improved; the number of blocks in the network is reduced; the processing pressure of the controller nodes is also reduced; and the robustness of the network is improved.

Description

Software-defined network controller network and its interaction method and storage medium

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is based on the CN application number 202110339592.X and the filing date is March 30, 2021, and claims its priority, and the disclosure content of the CN application is hereby incorporated into the present application as a whole.

technical field

The present disclosure relates to the technical field of software-defined networks, in particular to an SDN (Software Defined Network, software-defined network) controller network and an interaction method and storage medium thereof.

Background technique

The essential features of SDN are the separation of control and data planes and open programmability. By separating the control and data planes and open communication protocols, SDN breaks the closed nature of traditional network equipment. In addition, open interfaces and programmability in north-south and east-west directions make network management simpler, more dynamic and more flexible.

The SDN controller is the core component of the control plane and the logical center of the entire SDN architecture. With the expansion of SDN network scale, SDN controllers constitute a relatively complex and huge controller network. In order to strengthen the operation coordination of SDN controllers, the usual practice is to set up a central SDN controller management platform to collect the running status of each controller regularly. Implementing management and control configurations on the SDN controller, such as load balancing, increases construction costs and operating costs.

SUMMARY OF THE INVENTION

An object of the present disclosure is to improve the work interoperability between SDN controllers.

According to an aspect of some embodiments of the present disclosure, an interaction method for an SDN controller network is proposed, including: a central state SDN controller node in the SDN controller network generates a block according to collected information, and puts the block on the block. The SDN controller network is a blockchain network, and the SDN controller node in the central state is determined according to the available resources of the SDN controller node in the SDN controller network; the SDN controller in the non-central state in the SDN controller network The controller node obtains the block and stores it; each SDN controller node in the SDN controller network re-determines the SDN controller node in the central state according to the available resources of each SDN controller node in the SDN controller network.

In some embodiments, the interaction method of the SDN controller network further includes: when each SDN controller node in the non-central state in the SDN controller network changes its own resources, sending resource change information to the SDN controller in the central state The SDN controller node in the central state stores the resource change information when the verification of the resource change information is passed, and takes the resource change information as the collected information or as a part of the collected information when generating blocks.

In some embodiments, the SDN controller node in the central state starts timing after becoming the central state, or starts timing after collecting information; when the timing reaches a predetermined time period, the operation of generating a block is performed.

In some embodiments, the interaction method of the SDN controller network further includes: each SDN controller node in the SDN controller network determines the SDN controller in the central state according to the available resources of each SDN controller node in the SDN controller network node.

In some embodiments, determining the SDN controller node in the central state includes: obtaining the available resource evaluation value of each SDN controller node according to the stock resources and available resources of each SDN controller node; determining the available resource evaluation value The SDN controller node with the highest value is the SDN controller node in the central state.

In some embodiments, obtaining the evaluation value of the available resource amount of each SDN controller node according to the stock resource amount and the available resource amount of each SDN controller node includes: according to the stock resource amount of each type of each SDN controller node and available resources, obtain the used resources of the corresponding type, and determine the resource consumption ratio of the corresponding type, where the types of resources include the computing resources, storage resources and memory resources of the virtual machine, and the network resources of the link. According to the proportion of the resource consumption ratio of each type in the resource consumption ratio of all types, the weight of the corresponding type of resources is determined; for each SDN controller node, according to the available resources of each type and the corresponding type Determine the weighted sum of the resource amount weights of , and obtain the available resource amount evaluation value of the corresponding SDN controller node.

In some embodiments, the interaction method of the SDN controller network further includes: for each SDN controller node, acquiring the corresponding SDN controller according to the resources of each virtual machine and the link between the virtual machines constituting the SDN controller node The resource amount of the server node, wherein the resource amount is divided into the stock resource amount and the available resource amount.

According to an aspect of some embodiments of the present disclosure, an SDN controller network is proposed, including: a plurality of SDN controller nodes and links between the nodes to form a blockchain network; the SDN controller nodes include:

The block generation unit is configured to generate a block according to the collected information and upload the block to the chain when it is in a central state, wherein the SDN controller node in the central state is an SDN controller according to the SDN controller network The amount of available resources of the node is determined;

The block storage unit is configured to store the blocks generated by itself in the case of being in the central state; in the case of not being in the central state, obtain the blocks issued by the controller node in the central state, and store them;

The central state node determination unit is configured to re-determine the SDN controller node in the central state according to the available resources of each SDN controller node in the SDN controller network after the block storage unit stores the block.

In some embodiments, the SDN controller node further includes: a resource update unit, configured to send resource change information to the SDN in the central state if its own resources change when the SDN controller node is in a non-central state The controller node; the verification storage unit is configured to store the resource change information if the verification of the resource change information is passed when the SDN controller node is in the central state, and provide it to the block generation unit, so that the block generation unit The resource change information is used as the collected information or as a part of the collected information when the block is generated.

In some embodiments, the central state node determining unit is further configured to: determine the initial central state SDN controller node according to the amount of available resources of each SDN controller node in the SDN controller network.

According to an aspect of some embodiments of the present disclosure, there is provided a software-defined network controller network, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute any one of the above based on instructions stored in the memory a method.

According to an aspect of some embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium having computer program instructions stored thereon, the instructions implementing the steps of any one of the above methods when executed by a processor.

Description of drawings

The accompanying drawings described herein are used to provide further understanding of the present disclosure and constitute a part of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the attached image:

FIG. 1 is a flowchart of some embodiments of the disclosed SDN controller network interaction method.

FIG. 2 is a flowchart of other embodiments of the disclosed SDN controller network interaction method.

FIG. 3 is a signaling interaction diagram of some embodiments of the disclosed SDN controller network interaction method.

FIG. 4 is a flowchart of some embodiments of determining a central state of an SDN controller node in the disclosed SDN controller network interaction method.

5 is a schematic diagram of some embodiments of the disclosed SDN controller network.

6 is a schematic diagram of some embodiments of SDN controller nodes in the SDN controller network of the present disclosure.

FIG. 7 is a schematic diagram of further embodiments of nodes in the SDN controller network of the present disclosure.

8 is a schematic diagram of further embodiments of nodes in the SDN controller network of the present disclosure.

Detailed ways

The technical solutions of the present disclosure will be further described in detail below through the accompanying drawings and embodiments.

Blockchain technology is a promising decentralized distributed data management framework and has been applied to many distributed system scenarios. Blockchain can achieve high efficiency and low cost through a decentralized and unforgeable computing model. It is widely used in finance, logistics, industrial manufacturing, medical care, Internet of Things and other fields.

A flowchart of some embodiments of the SDN controller network interaction method of the present disclosure is shown in FIG. 1 . The SDN controller network is a blockchain network, in which one SDN controller node is in the central state, other SDN controller nodes are in the non-central state, the nodes in the central state have accounting rights, and other nodes passively receive storage blocks and do not own accounting rights.

In step 101, the SDN controller node in the central state generates a block according to the collected information, and uploads the block to the chain, wherein the SDN controller node in the central state is based on the available resources of the SDN controller node in the SDN controller network Quantity is determined.

In some embodiments, the collected information may include data of the data network collected by the SDN controller node in the central state, changes in the state of the SDN controller itself, and data from the SDN controller node in the non-central state. In some embodiments, the data from the SDN controller node in the non-central state may include the data of the data network collected by the corresponding SDN controller node and the state change of the SDN controller itself.

In step 102, the SDN controller node in the non-central state in the SDN controller network acquires and stores the block. In some embodiments, the SDN controller node in the non-central state will first verify the block based on the operating rules of the blockchain network; if the verification is passed, the block will be stored on the chain. In some embodiments, the SDN controller node in the central state, as part of the blockchain network, also stores the blocks generated by itself on the chain.

In step 103, after the blockchain is completed, each SDN controller node in the SDN controller network re-determines the SDN controller node in the central state according to the available resources of each SDN controller node in the SDN controller network . Since each SDN controller node is based on the same data when determining the node in the central state, the SDN controller node in the same central state can be selected.

Through this method, the information management of the SDN controller can be carried out in the form of a blockchain network, and the reliability of the distributed SDN controller can be improved; While storing information, the mechanism also improves the cooperative operation ability between controllers; the controller node in the central state is responsible for the generation and uploading of blocks, and the controllers in other states accept the blocks produced by the controller node in the central state. , reduce the number of blocks in the network, also reduce the node processing pressure of the controller, and improve the robustness of the network.

The flowchart of other embodiments of the SDN controller network interaction method of the present disclosure is shown in FIG. 2 .

In step 201, each SDN controller node in the SDN controller network determines the SDN controller node in the central state according to the available resources of each SDN controller node in the SDN controller network. In some embodiments, the SDN controller node that determines the central state for the first time may trigger execution when the network is initially constructed.

In some embodiments, the stock resource amount and the available resource amount of each SDN controller node may be obtained first, and an evaluation value of the available resource amount of each SDN controller node may be determined according to the obtained information. Further, the SDN controller node with the highest available resource evaluation value is determined as the SDN controller node in the central state.

In step 202, the SDN controller node in the central state determined in step 201 in this cycle starts timing after becoming the central state, or starts timing after collecting information. In some embodiments, a timer can be set, and a predetermined time period can be set as the upper limit of time.

In step 203, it is determined whether the timing has reached a predetermined duration. If the predetermined time period is reached, go to step 204; otherwise, continue to wait. During the waiting process, each SDN controller node in the SDN controller network collects information and sends it to the SDN controller that becomes the central state.

In step 204, the SDN controller node in the central state summarizes the information collected during the waiting process, generates a block, and uploads the block to the chain; the SDN controller node in the central state also stores the block itself.

In step 205, the SDN controller node in the non-central state in the SDN controller network acquires and stores the block. Going back to step 201, the SDN controller node in the central state is re-determined.

Through this method, the reselection of the SDN controller node in the central state can be performed whenever a block is generated or stored, so as to fully consider the resource occupation of the block chain node by the generation and storage of the block, ensuring that The nodes in the central state have the best performance in the network, which improves the processing efficiency and reliability of the SDN controller network.

A signaling interaction diagram of some embodiments of the SDN controller network interaction method of the present disclosure is shown in FIG. 3 . Only two of the nodes are shown in the figure, and one of them is determined as the node in the central state in step 301, which is only illustrated by the interaction between the SDN controller node in the central state and the SDN controller node in the non-central state. .

In step 301, the SDN controller node 31 determines that the SDN controller node in the central state is 32 according to the available resources of each SDN controller node in the SDN controller network. According to the same data, the SDN controller node 32 will determine itself as the SDN controller node in the central state.

In some embodiments, each SDN controller node may scan each SDN controller in the blockchain to obtain the resource status of each node.

In step 302, when the own resources of the SDN controller node 31 change, resource change information is generated.

In step 303, the SDN controller node 31 sends its own resource change information to the SDN controller node 32 in the central state.

In step 304, the SDN controller node 32 receives the resource change information and verifies it. If the verification is passed, it will be stored for backup and start timing.

In step 305, when the timing reaches a predetermined time period, the SDN controller node 32 will store the spare information generation block during the timing process, and store it after authentication.

In step 306, the SDN controller node 32 uploads the generated block to the chain so that other SDN controller nodes can obtain it.

In step 307, the SDN controller node 31 authenticates the acquired block, and stores the block if the authentication is passed.

In step 308, the SDN controller node 31 and the SDN controller node 32 re-determine the SDN controller node in the central state based on the current resource amount of each node.

Through this method, a collaborative mechanism is established between the various SDN controllers on the blockchain, which can complete tasks such as load balancing and other business scheduling and configuration management without the need to build a central business control platform separately, realizing decentralization. Coordinated control and interaction, avoid the impact of the performance limitations of a single node on the overall performance of the network, and improve the reliability and robustness of the SDN controller network.

In some embodiments, in the above step 201, the flowchart of some embodiments of the SDN controller node that determines the central state each time is shown in FIG. 4 .

In step 401, the network device in the SDN control domain will send the packet_in data packet to the SDN controller. At the same time, the SDN controller calculates the route through the global view and sends the flow table to the network device for installation by the network device. In addition, the controller and the network device There are also interactive messages such as "port-status" and "flow-removed". These operations will occupy a series of resources such as link bandwidth, CPU, memory, and storage of the controller. According to the stock resource amount and available resource amount of each type of each SDN controller node, the used resource amount of the corresponding type is obtained, and the resource consumption ratio of the corresponding type is determined.

In some embodiments, for each SDN controller node, the resource amount of the corresponding SDN controller node may be obtained according to the resource amount of each virtual machine and the link between the virtual machines constituting the SDN controller node, wherein, Resources are divided into stock resources and available resources.

The SDN controller resource data model includes three parts:

1) SDN control domain ID

DOM_ID is used to identify the ID number of the SDN control domain;

2) SDN controller stock resources

R is the set of stock resources, that is, the sum of the used and available resources of the controller, including C (computing resources), S (storage resources), M (memory resources), and N (network resources). Currently, SDN controller nodes are generally deployed based on virtualized facilities, and a single SDN controller node is composed of one or more virtual machines. _Vi is the amount of computing resources of a single virtual machine; _Li is the amount of storage resources of a single virtual machine; Wi is the amount of memory resources of a single virtual machine; D _i is the amount of network resources of a single link between virtual machines _.

Among them, C _j , S _j , M _j and N _j are the computing resources, storage resources, memory resources and network resources of the SDN controller node j, respectively, P is the number of virtual machines constituting the SDN controller node j, Q is the number of links between virtual machines constituting the SDN controller node j; V _ij is the amount of computing resources of the virtual machine i in the SDN controller node j; L _ij is the amount of storage resources of the virtual machine i in the SDN controller node j; W _ij is the memory resource amount of virtual machine i in SDN controller node j; D _ij is the network resource amount of link i in SDN controller node j.

3) Available resources of SDN controller

The available resources of the SDN controller are the remaining resources that are currently not in use, including the remaining computing resources △C of the virtual machine, the remaining storage resources △S and the remaining memory resources △M, and the network resources of the remaining links △ Four types of N.

Among them, ΔC _j , ΔS _j , ΔM _j and ΔN _j are the remaining available computing resources, storage resources, memory resources and network resources of the SDN controller node j, respectively. ΔV _ij is the remaining available computing resources of virtual machine i in SDN controller node j; ΔL _ij is the remaining available storage resources of virtual machine i in SDN controller node j; ΔW _ij is SDN controller node The remaining available memory resources of virtual machine i in j; ΔD _ij is the remaining available network resources of link i in SDN controller node j.

Further, based on the stock resources and available resources of each SDN controller, various stock resources and available resources of the SDN controller network can be obtained, where:

The consumption ratio of various resources in the overall resource is calculated as follows:

Among them, α ₁ to α ₄ are the consumption ratios of computing resources, storage resources, memory resources, and network resources, respectively.

In step 402, the weight of the resource amount of the corresponding type is determined according to the ratio of the resource consumption ratio of each type to the resource consumption ratio of all types.

In some embodiments, based on the formula

The weights β ₁ , β ₂ , β ₃ , and β ₄ of computing resources, storage resources, memory resources and network resources are obtained respectively.

In step 403, for each SDN controller node, a weighted sum is determined according to the available resource amount of each type and the weight of the resource amount of the corresponding type, and an evaluation value of the available resource amount of the corresponding SDN controller node is obtained.

In some embodiments, the available resource evaluation value ΔR _j of the SDN controller node j can be obtained based on the following formula:

ΔR _j =β ₁ ×ΔC _j +β ₂ ×ΔS _j +β ₃ ×ΔM _j +β ₄ ×ΔN _j

The stock resource evaluation value ΔR _j of the SDN controller node j can be obtained based on the following formula:

R _j =β ₁ ×C _j +β ₂ ×S _j +β ₃ ×M _j +β ₄ ×N _j

Through such a method, the weights of different types of resources are determined based on the consumption of various resources existing at each node, and then the weights can be comprehensively considered when determining the available resource evaluation value, so as to improve the rationality of the remaining resource evaluation and optimize the The accuracy of the selection of SDN controller nodes in the central state further improves the performance and reliability of the SDN controller network.

A schematic diagram of some embodiments of the SDN controller network of the present disclosure is shown in FIG. 5 . The SDN controller network includes SDN controller nodes 51-5N and links 50 between the nodes, where N is the number of SDN controller nodes.

A schematic diagram of some embodiments of an SDN controller node is shown in FIG. 6 .

The block generating unit 601 can generate a block according to the collected information under the condition of being in the center state, and upload the block to the chain, wherein the SDN controller node in the center state is based on the SDN controller node in the SDN controller network. The amount of available resources is determined.

When the block storage unit 602 is in the central state, it can store the blocks generated by itself; when it is not in the central state, obtain and store the blocks issued by the controller node in the central state.

The central state node determining unit 603 can re-determine the SDN controller node in the central state according to the available resources of each SDN controller node in the SDN controller network after the block storage unit stores the block.

Such SDN controller network adopts the form of blockchain network for information management, which improves the reliability of distributed SDN controllers; by dynamically selecting nodes in the central state, information storage is performed using the mechanism of blockchain network. At the same time, it also improves the cooperative operation ability between controllers. The controller node in the central state is responsible for the generation and uploading of blocks, and the controllers in other states accept the blocks produced by the controller node in the central state, reducing the number of blocks in the network. It also reduces the processing pressure of the controller node and improves the robustness of the network.

In some embodiments, the central state node determining unit 603 can also determine the initial central state SDN controller node according to the available resources of each SDN controller node in the SDN controller network when the initial network construction is completed and the operation starts. , to ensure the automatic cycle operation of the network.

In some embodiments, as shown in FIG. 6 , the SDN controller network may also include a resource update unit 604 and a verification storage unit 605 .

The resource updating unit 604 can send resource change information to the SDN controller node in the central state if its own resources change when the SDN controller node is in the non-central state.

The verification storage unit 605 can store the resource change information when the SDN controller node is in the central state, if the verification of the resource change information is passed, and provide the resource change information to the block generation unit, so that the block generation unit will store the resource change information when generating the block. Resource change information as collected information, or as part of collected information.

In such an SDN controller network, each SDN controller node in a non-central state can send the information generated and collected by itself to the SDN controller node in the central state, and use its ability to generate blocks and upload the chain to realize data storage. Data loss is avoided and the reliability of the SDN controller network is further improved.

A schematic structural diagram of an embodiment of each node of the SDN controller network of the present disclosure is shown in FIG. 7 . Each node in the SDN controller network includes a memory 701 and a processor 702 . Wherein: the memory 701 may be a magnetic disk, a flash memory or any other non-volatile storage medium. The memory is used to store the instructions in the above-mentioned corresponding embodiments of the interaction method of the SDN controller network. The processor 702 is coupled to the memory 701 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 702 is configured to execute the instructions stored in the memory, which can improve the reliability of the distributed SDN controller, reduce the processing pressure of the controller node, and improve the robustness of the network.

In one embodiment, as shown in FIG. 8 , each node 800 of the SDN controller network includes a memory 801 and a processor 802 . Processor 802 is coupled to memory 801 through BUS 803 . Each node 800 of the SDN controller network can also be connected to an external storage device 805 through a storage interface 804 for recalling external data, and can also be connected to a network or another computer system (not shown) through a network interface 806 . It will not be described in detail here.

In this embodiment, the data instructions are stored in the memory, and the above instructions are processed by the processor, which can improve the reliability of the distributed SDN controller, reduce the processing pressure of the controller nodes, and improve the robustness of the network.

In another embodiment, a non-transitory computer-readable storage medium has computer program instructions stored thereon, and when the instructions are executed by a processor, implement the steps of the method in the corresponding embodiment of the method for interacting with the SDN controller network. As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein .

The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

So far, the present disclosure has been described in detail. Some details that are well known in the art are not described in order to avoid obscuring the concept of the present disclosure. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

The methods and apparatus of the present disclosure may be implemented in many ways. For example, the methods and apparatus of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Furthermore, in some embodiments, the present disclosure can also be implemented as programs recorded in a recording medium, the programs including machine-readable instructions for implementing methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand: The disclosed specific embodiments are modified or some technical features are equivalently replaced; without departing from the spirit of the technical solutions of the present disclosure, all of them should be included in the scope of the technical solutions claimed in the present disclosure.

Claims

An interaction method for a software-defined network controller network, comprising:

The SDN controller node in the central state in the software-defined network SDN controller network generates blocks according to the collected information, and uploads the blocks to the chain, wherein the SDN controller network is a blockchain network, and the central state of the SDN controller network is a blockchain network. The SDN controller node is determined according to the amount of available resources of the SDN controller node in the SDN controller network;

The SDN controller node in the non-central state in the SDN controller network acquires the block and stores it;

Each SDN controller node in the SDN controller network re-determines the SDN controller node in the central state according to the available resources of each SDN controller node in the SDN controller network.
The interaction method for a software-defined network controller network according to claim 1, further comprising:

Each non-central state SDN controller node in the SDN controller network sends resource change information to the central state SDN controller node when its own resources change;

The SDN controller node in the central state stores the resource change information in the case of passing the verification of the resource change information, and uses the resource change information as the collected information or as the collected information when generating a block. a part of.
The interaction method of a software-defined network controller network according to claim 1, wherein the SDN controller node in the central state starts timing after becoming the central state, or starts timing after collecting information;

When the timer reaches a predetermined duration, the operation of generating a block is performed.
The interaction method for a software-defined network controller network according to claim 1, further comprising:

Each SDN controller node in the SDN controller network determines the SDN controller node in the central state according to the available resources of each SDN controller node in the SDN controller network.
The interaction method for a software-defined network controller network according to claim 1 or 4, wherein the SDN controller node for determining the central state comprises:

Obtain the available resource evaluation value of each SDN controller node according to the stock resources and available resources of each SDN controller node;

The SDN controller node with the highest available resource evaluation value is determined as the SDN controller node in the central state.
The method for interacting with a software-defined network controller network according to claim 6, wherein the obtaining an evaluation value of the available resource amount of each SDN controller node according to the stock resource amount and the available resource amount of each SDN controller node comprises: :

According to the stock resources and available resources of each type of each SDN controller node, the used resources of the corresponding type are obtained, and the resource consumption ratio of the corresponding type is determined, wherein the types of resources include the computing resources of virtual machines, The amount of storage resources and memory resources, and the amount of network resources of the link;

According to the proportion of the resource consumption ratio of each type in the resource consumption ratio of all types, the weight of the resource amount of the corresponding type is determined,

For each SDN controller node, a weighted sum is determined according to the available resource amount of each type and the weight of the resource amount of the corresponding type, and the evaluation value of the available resource amount of the corresponding SDN controller node is obtained.
The interaction method for a software-defined network controller network according to claim 6, further comprising:

For each SDN controller node, the resource amount of the corresponding SDN controller node is obtained according to the resource amount of each virtual machine and the link between the virtual machines constituting the SDN controller node, wherein the resource amount is divided into Stock and available resources.
A software-defined network controller network comprising:

Multiple SDN controller nodes and links between nodes form a blockchain network;

SDN controller nodes include:

The block generation unit is configured to generate a block according to the collected information when the SDN controller node is in a central state, and upload the block to the chain, wherein the SDN controller node in the central state is based on the The amount of available resources of the SDN controller node in the SDN controller network is determined;

The block storage unit is configured to store the blocks generated by itself when the SDN controller node is in the central state; and obtain the blocks issued by the controller node in the central state when the SDN controller node is not in the central state , and store;

The central state node determination unit is configured to re-determine the SDN controller node in the central state according to the available resources of each SDN controller node in the SDN controller network after the block storage unit stores the block.
The software-defined network controller network of claim 8, wherein the SDN controller node further comprises:

A resource updating unit, configured to send resource change information to the SDN controller node in the central state if its own resources change when the SDN controller node is in a non-central state;

A verification storage unit, configured to store the resource change information if the SDN controller node is in the central state, if the verification of the resource change information is passed, and provide the resource change information to the block generation unit, so that The block generating unit takes the resource change information as the collected information or as a part of the collected information when generating the block.
The software-defined network controller network of claim 8, wherein the central state node determination unit is further configured to:

According to the available resources of each SDN controller node in the SDN controller network, the SDN controller node in the initial central state is determined.
A software-defined network controller network comprising:

memory; and

A processor coupled to the memory, the processor configured to perform the method of any one of claims 1 to 7 based on instructions stored in the memory.
A non-transitory computer-readable storage medium having computer program instructions stored thereon, the instructions, when executed by a processor, implement the steps of the method of any one of claims 1 to 7.