CN117614909A

CN117614909A - Multi-domain SDN controller resource reservation system and method

Info

Publication number: CN117614909A
Application number: CN202311333728.1A
Authority: CN
Inventors: 廖志文; 马维旻; 李四维; 刘星; 李平; 陈国立
Original assignee: Zhuhai City Polytechnic
Current assignee: Zhuhai City Polytechnic
Priority date: 2023-10-13
Filing date: 2023-10-13
Publication date: 2024-02-27

Abstract

The application discloses a multi-domain SDN controller resource reservation method and a system, wherein the method is applied to a multi-domain SDN controller resource reservation system, and the system comprises a resource reservation orchestrator, a plurality of SDN area controllers and a WAN controller; the method comprises the following steps: the resource reservation scheduler receives the resource reservation request and sends the resource reservation request to the target controller; the target controller configures reserved bandwidth for the resource reservation request according to the network resource condition and feeds back response information; the resource reservation orchestrator generates a permission token based on the reply information, and the SDN controller provides reserved bandwidth for the data flow that is verified to be successful. According to the method and the device, the resource reservation requests are respectively controlled by the controllers, and when all the controllers meet the requirements of the resource reservation requests, the permission tokens are generated for the data streams corresponding to the resource reservation requests, so that all the controllers can meet the resource requirements of the data streams, and the resource utilization rate can be improved on the premise of ensuring the service quality.

Description

Multi-domain SDN controller resource reservation system and method

Technical Field

The present disclosure relates to the field of computer networks, and in particular, to a method and an apparatus for reserving resources in a multi-domain SDN controller.

Background

In the current education and scientific research special network, a Software Defined Network (SDN) technology is used for providing special links for high-priority users and important services, so that the service quality of the users is guaranteed. SDN can provide differentiated services for users, and network resources are more easily managed, configured and optimized in a personalized manner due to the separation of a control plane and a data plane. Although Software Defined Networks (SDN) can guarantee quality of service for high priority users and important services by providing dedicated links, existing resource reservation methods only reserve resources for a single data flow, and are difficult to cope with a large number of concurrent resource reservation request situations. This problem severely limits the ability of SDN to ensure quality of service and improve resource utilization. In addition, the current resource reservation mode does not have complete and effective flow control from application, authorization and use to release, and the problems of error in resource allocation, low use efficiency and the like are generated. In particular, when the network controller processes the resource reservation request, it cannot know the global resource usage status, which results in low decision efficiency of resource allocation, and cannot accurately reflect the actual usage status of the current network resource, thereby affecting the maximization of the resource reservation effect. Therefore, how to improve the resource reservation method of the SDN so that it can cope with a large number of concurrent resource reservation requests and how to manage the whole flow of network resource reservation more effectively is a problem to be studied and solved at present.

There is thus a need for improvements and improvements in the art.

Disclosure of Invention

The technical problem to be solved by the application is to provide a resource reservation method and a related device of a multi-domain SDN controller aiming at the defects of the prior art.

In order to solve the above technical problems, a first aspect of the embodiments of the present application provides a multi-domain SDN controller resource reservation method and related devices, where the method is applied to a multi-domain SDN controller resource reservation system, where the multi-domain SDN controller resource reservation system includes a resource reservation orchestrator, a plurality of SDN area controllers, and a WAN controller; the resource reservation method of the multi-domain SDN controller comprises the following steps:

the resource reservation scheduler receives a resource reservation request and sends the resource reservation request to each target controller in a target controller set corresponding to the resource reservation request, wherein the target controller set comprises the SDN area controller and the WAN controller required by the resource reservation request;

each target controller in the target controller set configures reserved bandwidth for the resource reservation request according to the network resource condition, generates application response information of the resource reservation request, and feeds back the application response information to a resource reservation orchestrator;

When the application response information of each target controller carries reserved resource information, the resource reservation composer generates a permission token for the resource reservation request, and associates the permission token with the reserved resource information corresponding to each target controller;

the SDN regional controller in the target controller set receives the data flow and verifies the permission token carried by the data flow through the resource reservation composer; and providing the corresponding reserved bandwidth for the data flow when the verification is successful.

According to the technical means, the resource reservation method and the related device of the multi-domain SDN controller solve the key problems of network resource reservation and management. The system includes a resource reservation orchestrator and a plurality of SDN area & WAN controllers. The workflow of the system encompasses: the scheduler receives the resource reservation request and sends the resource reservation request to the relevant target controller; the target controller configures reserved bandwidth for the request according to the network resource of the target controller, generates application response information and feeds the application response information back to the orchestrator; when all the responses carry reserved resource information, the orchestrator generates a permission token and associates the resource information; the target controller receives the data stream and verifies the carried license token through the orchestrator; after verification is successful, a corresponding reserved bandwidth is provided for the data stream. The scheme based on the technical means realizes dynamic and high-priority resource allocation and management, and improves the network resource efficiency and the service quality. By means of real-time monitoring and flexible configuration of own network resources, the utilization rate of bandwidth and the overall performance of the system are greatly improved.

In an implementation manner, the multi-domain SDN controller resource reservation method further includes:

when the application response information of at least one controller does not carry the reserved resource information, the resource reservation orchestrator informs the controller which applies that the response information carries the reserved resource information to cancel the reserved bandwidth reserved for the resource reservation request, and feeds back the prompt information of reservation failure.

According to the technical means, the resource reservation method of the multi-domain SDN controller is further optimized. When the application response of at least one controller does not carry the reserved resource information, the resource reservation orchestrator informs the controller with reserved bandwidth to cancel the reservation, and feeds back failure information. This strategy increases the robustness of the system, ensuring that services are only approved if all controllers can fulfill the reserved bandwidth request. Therefore, resource waste caused by the fact that part of controllers cannot meet reservation requirements is avoided, management of a system on failure conditions is enhanced, resource utilization rate is further optimized, and service quality is improved.

In one implementation manner, the multi-domain SDN controller resource reservation method, wherein configuring, by each target controller in the target controller set, a reserved bandwidth for the resource reservation request according to a network resource condition of the target controller set and generating application response information of the resource reservation request specifically includes:

Each target controller in the target controller set adopts a resource reservation algorithm based on an elastic time slot to determine whether the network resource state of each target controller meets a resource reservation request;

when the resource reservation request is met, the target controller configures a reserved bandwidth for the resource reservation request, generates reserved resource information, and generates application response information carrying the reserved resource information;

when the resource reservation request is not satisfied, the target controller generates application response information which does not carry reserved resource information.

According to the technical means, by adopting the resource reservation algorithm based on the elastic time slot, each target controller can allocate reserved bandwidth for the resource reservation request according to the network resource condition of the target controller and generate corresponding application response information. The flexibility and accuracy of resource allocation are further optimized by the resource reservation algorithm of the flexible time slot. If the network resource meets the reservation request, the target controller configures the reservation bandwidth for the request and generates application response information, so that the resource is ensured to be effectively utilized; otherwise, if the network resource cannot meet the request, the controller generates response information which does not carry the reserved resource information, so that the waste of the resource is avoided. By means of the technical means, the adaptability of network resource allocation is improved, the service quality is guaranteed, and the effects of improving the resource utilization rate and automatically and effectively managing the network resources are achieved.

In one implementation manner, the multi-domain SDN controller resource reservation method, wherein an SDN regional controller in the target controller set receives a data stream and verifies a permission token carried by the data stream through a resource reservation orchestrator; before providing the data stream with its corresponding reserved bandwidth upon successful authentication, the method further comprises:

each target controller in the target controller set monitors a time difference value between a starting time corresponding to the resource reservation request and the current time;

when the time difference value meets a preset condition, and the target controller sets do not receive the data stream carrying the permission token corresponding to the resource reservation request, each target controller controls reserved resource information corresponding to the resource reservation request.

According to the technical means, by implementing the multi-domain SDN controller resource reservation method, after the SDN regional controllers in the target controller set receive and verify the correctness of the permission tokens carried by the data flows, reserved bandwidths are provided for the data flows. In addition, before reserving the bandwidth, the method introduces a monitoring link of the difference value between the starting time corresponding to the resource reservation request and the current time by each controller. And only when the time difference value meets the preset condition, each target controller starts to control the related reserved resource information under the condition that the data stream carrying the permission token is not received, so that the reasonable allocation and utilization of reserved resources are further ensured, and more flexible operation space is provided for dynamically adjusting the reserved bandwidth.

In one implementation manner, the multi-domain SDN controller resource reservation method, wherein the method further includes:

when the current time reaches the end time corresponding to the resource reservation request or the data stream carrying the permission token corresponding to the resource reservation request is transmitted, each target controller in the target controller set releases the reserved bandwidth corresponding to the resource reservation request.

According to the technical means, by the multi-domain SDN controller resource reservation method, when the current time reaches the end time corresponding to the resource reservation request or the data stream transmission is finished, the reserved bandwidth is automatically released, and the dynamic management and effective utilization of the resources are realized. The method combines the real-time monitoring and the efficient resource coordination of the network to meet the priority demands of different services, ensures the service quality and obviously improves the resource utilization rate. In addition, the method provides a finer and flexible network service use experience for users through staged resource application, authorization, use and release.

When a target resource controller configures reserved bandwidth for the resource reservation request, the target resource controller acquires the actual occupied bandwidth of a data stream corresponding to the resource reservation request in real time, and adjusts the reserved bandwidth and the shared bandwidth according to the actual occupied bandwidth;

and the target resource controller updates the adjusted reserved bandwidth to each switch covered by the target resource controller and informs the resource reservation orchestrator of the adjusted shared bandwidth.

According to the technical means, the function of the resource reservation method is expanded, and when the target resource controller configures the reserved bandwidth, the actual occupied bandwidth of the corresponding data stream can be captured in real time. In other words, the system can dynamically adjust the reserved bandwidth and the shared bandwidth according to the actual use requirement, thereby playing an important role in coping with fluctuation in real-time network traffic and guaranteeing service quality. Second, by updating the reserved bandwidth, the method ensures consistency among different internet switches. At the same time, the information of the shared bandwidth is also timely notified to the resource reservation composer. The above technical means provides a more flexible, dynamic and efficient resource management solution to adapt to complex and changeable network environments and user demands.

In one implementation manner, the multi-domain SDN controller resource reservation method, wherein the adjustment rule of the reserved bandwidth is:

wherein share_threshold represents the adjusted reserved and common bandwidth shared bandwidth, b _k Indicating that the bandwidth is reserved,representing the actual occupied bandwidth, θ represents the boundary bandwidth of the shared bandwidth of reserved and normal bandwidths.

A second aspect of the embodiments of the present application provides a multi-domain SDN controller resource reservation system, the system including: a resource reservation orchestrator, a plurality of SDN area controllers, and a WAN controller; the SDN controllers and the WAN controllers are connected with the resource reservation arrangement, the SDN controllers are used for managing local area network resources, and the WAN controllers are used for managing WAN area resources;

the resource reservation composer is configured to receive a resource reservation request, and send the resource reservation request to each target controller in a target controller set corresponding to the resource reservation request; when the application response information of each target controller carries reserved resource information, a resource reservation orchestrator generates a permission token for the resource reservation request, and associates the permission token with the reserved resource information corresponding to each target controller; the target controller set comprises an SDN area controller and a WAN controller which are required by the resource reservation request;

Each SDN area controller and each WAN controller are used for configuring reserved bandwidth for the resource reservation request according to the network resource condition, generating application response information of the resource reservation request and feeding back the application response information to a resource reservation orchestrator;

each SDN area controller is also used for receiving a data stream and verifying a permission token carried by the data stream through a resource reservation orchestrator; and providing the corresponding reserved bandwidth for the data flow when the verification is successful.

In one implementation, each SDN area controller and WAN controller is further configured to: acquiring the actual occupied bandwidth of the data stream corresponding to the resource reservation request in real time, and adjusting the reserved bandwidth and the shared bandwidth according to the actual occupied size; and updating the adjusted reserved bandwidths to each switch covered by each switch, and informing the resource reservation orchestrator of the adjusted shared bandwidths.

In another implementation, the system further comprises a user interface in communication with the resource reservation orchestrator.

The beneficial effects are that:

1. the resource reservation method for the multi-domain SDN controller can effectively reserve and configure resources among a plurality of SDN areas and the WAN, and ensures the cross-domain efficient management of a wide area network.

2. According to the multi-domain SDN controller resource reservation method, through the joint work of the resource reservation orchestrator, each SDN area controller and the WAN controller, the full-flow optimization from the reception of a resource reservation request to the generation of a reserved bandwidth and the verification and the provision of the reserved bandwidth is realized, the resource utilization efficiency is improved, and the error of resource allocation is reduced.

3. According to the multi-domain SDN controller resource reservation method, the limitation of single data flow reservation resources is solved through the integration and cooperative work of the multi-target controller, so that a system can cope with a large number of concurrent resource reservation requests, and the service quality under a multi-concurrent request scene is guaranteed.

4. According to the multi-domain SDN controller resource reservation method, the reserved bandwidth and the corresponding permission token are dynamically generated based on the network resource condition and the application response information, so that a dynamic resource allocation strategy is realized, the utilization rate of resources is improved, and the service quality is optimized.

5. According to the multi-domain SDN controller resource reservation method, centralized management and association of reserved resource information of each target controller are achieved through the resource reservation orchestrator, global resource use conditions can be obtained when resource reservation requests are processed, and the efficiency of resource allocation decision making is improved.

According to the resource reservation method and system for the SDN controller, the wide area network can be efficiently managed to span multiple domains. And dynamically adjusting network resource allocation by using tools such as SDN area controllers, WAN controllers and the like, and improving the resource utilization rate and the service quality. Particularly, through a staged resource reservation process comprising resource application, resource authorization, resource use and resource release stages, service priorities with different importance can be effectively distinguished, and the bandwidth requirement of high-priority service is ensured. Meanwhile, the system can monitor network traffic and resource usage in real time, and dynamically reserve bandwidth traffic according to the network traffic to further optimize resource utilization and service quality. The resource reservation management scheme is automatic, flexible and efficient, and provides effective support for real-time network services.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without creative effort for a person of ordinary skill in the art.

Fig. 1 is a flowchart of a multi-domain SDN controller resource reservation method provided in the present application.

Fig. 2 is a diagram of a resource management method based on an elastic time slot provided in the present application.

Fig. 3 is a frame diagram of a multi-domain SDN controller resource reservation system provided in the present application.

Detailed Description

The application provides a resource reservation method and a related device of a multi-domain SDN controller, and for making the purposes, technical schemes and effects of the application clearer and more definite, the application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.

It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be understood that the sequence number and the size of each step in this embodiment do not mean the sequence of execution, and the execution sequence of each process is determined by the function and the internal logic of each process, and should not constitute any limitation on the implementation process of the embodiment of the present application.

The inventor finds that in the education and scientific research special network at the present stage, a Software Defined Network (SDN) technology is used for providing a special link for high-priority users and important services, so that the service quality of the users is guaranteed to be a commonly adopted scheme. SDN can provide differentiated services for users, and network resources are more easily managed, configured and optimized in a personalized manner due to the separation of a control plane and a data plane. However, resource reservation based on SDN has some problems and disadvantages in practice, (1) current research on resource reservation mainly focuses on single domain resource reservation, and becomes a problem that an SDN controller is overloaded and single-point failure is easy to occur. (2) The existing method can only reserve resources for a single data stream, neglects the simultaneous existence of a large number of resource reservation requests, and cannot guarantee the service quality and improve the resource utilization rate. (3) The current resource reservation method reserves rated resources for a period of time according to the request of a user and distributes the resources when the resources arrive, which cannot adapt to the sudden situation or the condition that the applied resources are inaccurate by the user, and can cause network blockage, so that the service quality is reduced or the resources are not fully utilized. Research on how to improve the resource reservation method of SDN and overcome the problems at the same time has important practical value.

In order to solve the above-mentioned problems, in an embodiment of the present application, a multi-domain SDN controller resource reservation method is provided, where the method is applied to a multi-domain SDN controller resource reservation system, where the multi-domain SDN controller resource reservation system includes a resource reservation orchestrator, a plurality of SDN area controllers, and a WAN controller; the resource reservation method of the multi-domain SDN controller comprises the following steps: the resource reservation scheduler receives a resource reservation request and sends the resource reservation request to each target controller in a target controller set corresponding to the resource reservation request, wherein the target controller set comprises the SDN area controller and the WAN controller required by the resource reservation request; each target controller in the target controller set configures reserved bandwidth for the resource reservation request according to the network resource condition, generates application response information of the resource reservation request, and feeds back the application response information to a resource reservation orchestrator; when the application response information of each target controller carries reserved resource information, the resource reservation composer generates a permission token for the resource reservation request, and associates the permission token with the reserved resource information corresponding to each target controller; the SDN regional controller in the target controller set receives the data flow and verifies the permission token carried by the data flow through the resource reservation composer; and providing the corresponding reserved bandwidth for the data flow when the verification is successful. According to the resource reservation method and system for the SDN controller, the wide area network can be efficiently managed to span multiple domains. And dynamically adjusting network resource allocation by using tools such as SDN area controllers, WAN controllers and the like, and improving the resource utilization rate and the service quality. Particularly, through a staged resource reservation process comprising resource application, resource authorization, resource use and resource release stages, service priorities with different importance can be effectively distinguished, and the bandwidth requirement of high-priority service is ensured. Meanwhile, the system can monitor network traffic and resource usage in real time, and dynamically reserve bandwidth traffic according to the network traffic to further optimize resource utilization and service quality. The embodiment of the invention provides an automatic, flexible and efficient resource reservation management scheme, and provides effective support for real-time network services.

The application will be further described by the description of embodiments with reference to the accompanying drawings.

The embodiment provides a multi-domain SDN controller resource reservation method, which is applied to a multi-domain SDN controller resource reservation system as shown in fig. 3, wherein the multi-domain SDN controller resource reservation system comprises a resource reservation orchestrator, a plurality of SDN area controllers and a WAN controller.

Specifically, the SDN area controller is responsible for managing local area network resources, and the SDN area controller is functionally divided into a resource reservation module and a resource monitoring and adjusting module, where the resource reservation module adopts a preset algorithm to control access to a resource request, for example, when a bandwidth reservation request is triggered, the resource reservation module can process the request according to the preset algorithm, so that bandwidth resources can be fairly and efficiently allocated; the resource monitoring and adjusting module is responsible for monitoring the reserved bandwidth flow in real time in the resource using process, periodically adjusting the shared bandwidth size of the reserved bandwidth flow and the common flow, for example, in a large-flow peak time, when the shared bandwidth demand of the common flow suddenly increases, the resource monitoring and adjusting module can periodically adjust the shared bandwidth size of the reserved bandwidth flow and the common flow so as to more efficiently meet the user demand.

The WAN controller is responsible for managing WAN area resources, and the WAN controller and the SDN area controller have the same resource management and scheduling work.

The resource orchestrator receives the resource reservation request information of the user interface, determines the SDN controllers of the areas where the source end and the destination end are located and the SDN controllers through which the paths pass, and sends the resource reservation information to each of the SDN controllers and the WAN controllers, for example, for a data flow request crossing a plurality of SDN areas, the resource orchestrator determines each of the SDN controllers, determines the amount of reserved resources, and sends the information to participate in each of the SDN controllers and the WAN controllers. It is important that the resource orchestrator returns the resource reservation success information only when the resources in all domains through which the data stream passes meet the applied rated resources, otherwise returns the resource reservation failure information. Thus, fairness and effectiveness of resource allocation are guaranteed, and the use efficiency of network resources is greatly improved.

As shown in fig. 1, the multi-domain SDN controller resource reservation method provided in this embodiment specifically includes:

s10, a resource reservation orchestrator receives a resource reservation request and sends the resource reservation request to each target controller in a target controller set corresponding to the resource reservation request, wherein the target controller set comprises the SDN area controller and the WAN controller required by the resource reservation request.

In particular, the resource reservation request comes from a user or service, which when it is made by the user or service, is first received by the resource reservation orchestrator. For example, for a streaming service, a certain network bandwidth may need to be reserved to ensure smooth playback.

After receiving the request, the resource reservation orchestrator analyzes the request, and determines the type of resources and the amount of resources that need to be reserved. The orchestrator then sends the request to its corresponding set of target controllers. Included in the set of target controllers are respective SDN area controllers and WAN controllers that may participate in resource reservation work. For example, if the reserved resources relate to different network areas, the corresponding SDN area controller may be selected. If scheduling of resources of the wide area network is involved, the WAN controller is selected. The controllers feed back the received resource reservation requests according to the network resource conditions managed by the controllers.

The above process in step S10 ensures that the multi-domain SDN controller resource reservation system can cope with complex resource reservation requests, and any area or resource type can be allocated and scheduled according to actual requirements, so as to further optimize network service quality and improve resource utilization.

In a specific implementation of the present application, the user sends the kth resource reservation request R through the UI interface _k (src _k ,dest _k ,st _k ,et _k ,b _k ) To a resource reservation orchestrator, the request contains a source IP address src _k Destination endpoint IP address dest _k Start time st _k End time et _k And the bandwidth b of the application _k 。

S20, each target controller in the target controller set configures reserved bandwidth for the resource reservation request according to the network resource condition, generates application response information of the resource reservation request, and feeds the application response information back to a resource reservation orchestrator.

Specifically, after a resource reservation request is made, the target controllers within the target controller set begin processing the request according to their own network resource conditions. For example, a data center is squeezing the processing of high priority tasks to achieve customer demands for low latency and high bandwidth. At this point, a new reservation request comes right in. Correspondingly, the controller starts to collect network resource status data including current bandwidth usage status, task priority, network delay, etc., and decides how to configure the reserved bandwidth based on these information.

Each target controller generates application response information meeting the resource reservation request. The reply message is essentially a solution that solves the problem of maximally satisfying reservation requests under the current resource conditions. It should be noted that, the above process of configuring the reserved bandwidth for the resource reservation request according to the network resource status and generating the application response information may be deeply optimized by an algorithm, so as to ensure efficient use of resources.

The target controller feeds back the response information to the resource reservation composer. The resource reservation composer receives and adjusts the information reported by the controllers, generates a final permission token according to the overall resource condition, and transmits the final permission token to each controller. In this way, in the subsequent step, only the permission token carried by the data stream needs to be verified, so that the data stream can be smoothly provided with the corresponding reserved bandwidth.

In one implementation manner, each target controller in the target controller set configures a reserved bandwidth for the resource reservation request according to the network resource status of the target controller set and generates application response information of the resource reservation request specifically includes:

s21, each target controller in the target controller set adopts a resource reservation algorithm based on an elastic time slot to determine whether the network resource state meets the resource reservation request.

In particular, the flexible time slot based resource reservation algorithm is a flexible and accurate solution to the varying demands in order to provide optimal network resource usage. When a resource reservation request is sent to a set of target controllers, each target controller will determine whether they can fulfill the reservation request based on its own network resource status, i.e., available bandwidth, traffic, number of connections, etc.

For example, there is a video conference request that requires a certain bandwidth to guarantee smooth video quality. This request is forwarded to a target controller set comprising several SDN area controllers and WAN controllers. Each controller evaluates its available resources using a flexible time slot based resource reservation algorithm. If the controller's available resources are sufficient to meet the video conference requirements, the controller will configure the reserved bandwidth and generate application reply information for the resource reservation request. By the method, the resource reservation request can be satisfied according to the actual resource condition, the utilization rate of network resources is maximized, on one hand, the service quality is ensured, on the other hand, the resource utilization is optimized, and the effective input and output are realized.

In a specific implementation of the present application, the resource reservation orchestrator sends the request to the WAN controller and the SDN area controller, and the controller uses a resource reservation access control algorithm to confirm whether there is sufficient bandwidth in the time of the application according to the network resource status.

The application scene designed by the application method is to solve the technical problems of how to increase the application success rate, improve the network bandwidth resource utilization rate and reduce the time cost by reducing the running time when a large number of resource reservation requests arrive at the same time. Reserved bandwidth will result in future available bandwidth varying in fine granularity over time, especially when the number of requests to be applied is large, the time overhead and bandwidth usage will increase substantially. Therefore, it is important to design an efficient time domain-based resource management algorithm to improve the resource utilization rate and reduce the time complexity.

Therefore, the specific implementation of the present application proposes a resource reservation algorithm based on an elastic time slot, where the time slot refers to a time interval formed by two adjacent points on a time axis. The resource management method based on the time slot cuts the future applicable time interval into smaller time slots according to the application time, and saves the residual bandwidth condition of each link in the time slots, as shown in figure 2. The present application sets a path-variable service that provides a user with a fixed bandwidth, i.e., performs an access control calculation once path per time slot, to improve the reception rate.

The resource reservation algorithm uses the above-mentioned resource matrix to determine whether there is sufficient resource supply, i.e., the available bandwidth matrix is used for admission control. The link initial available bandwidth is the physical link bandwidth that the QoS assurance system can dominate. The available bandwidth matrix stores the available bandwidth conditions of all links in the application time slot. The present application uses discrete application times to cut an original continuous time into a plurality of smaller time slots. Accordingly, the available bandwidth of the link with time attributes may be represented as a two-dimensional matrix, where B _ij Representing link e _i In time slot [ T ] _j-1 ,T _j ]Available bandwidth size of B _i1 Representing the initial available bandwidth of the link.

The resource reservation algorithm based on the elastic time slot divides the resource access control process into two sub-modules: the dynamic time slot access control sub-module and the variable time slot access control sub-module. The dynamic time slot access control is used for accelerating the execution speed and reducing the time expenditure; variable time slot access control increases resource utilization for increasing request success rate. The two sub-modules are executed interactively, and the resource reservation algorithm based on the elastic time slot can reduce the time overhead and increase the network resource utilization rate.

Introducing time granularity in the dynamic time slot access control submodule, respectively reducing the starting time and the ending time of the request downwards and upwards to be integral times of the time granularity when the request arrives, and storing the reduced time in a one-dimensional array. In the variable time slot access control submodule, the original time of the application is saved, the time with the reduced time granularity being an integer multiple of the time is saved, and the two times are saved in a one-dimensional array at the same time. Along with the continuous arrival of the application, the future reservation time is continuously cut into time slots with fine granularity, and in order to save the available bandwidth condition of each time slot, a resource reservation algorithm based on an elastic time slot respectively creates resource matrixes based on the two time slots in the two sub-modules to realize the access control of the resource application.

Specifically, the flexible time slot-based resource reservation algorithm defines a one-dimensional time array TD to store integer time points of the reduced time granularity of the dynamic time slots, and defines a dynamic time slot resource matrix MD to preserve the available bandwidth of the network in each time slot. Similarly, a one-dimensional time array TE is defined to store discrete points in time of the variable time slots, and a variable time slot resource matrix ME is defined to preserve the available bandwidth of the network links in each time slot TE. In addition, two reserved arrays of RD and RE are defined for dynamic time slot access control and variable time slot access control respectively based on the elastic time slot, and the reserved arrays respectively store the accepted applications of the corresponding time slots for judging whether the access control is switched between the two time slot access controls based on the elastic time slot. When processing an application, based on the elastic time slot, firstly using the dynamic time slot resource matrix as access control, if the current resource can not supply the application, the system selectively switches to the variable time slot resource matrix as access control according to the reserved application numbers of the RD and RE reserved arrays.

In TD and TE, TD [1 ] is set]＝TE[1]=0, representing the start time of the time domain, assuming that the lengths of TD, TE are defined as LD and LE, respectively. Then { (i-1) |i >1, i.ltoreq.LD } dynamic time slots are denoted (TD [ i-1)],TD[i]) { (i '-1) |i'>1, i '. Ltoreq.LE } variable time slots are denoted (TE [ i' -1)],TE[i′]) The method comprises the steps of carrying out a first treatment on the surface of the In this case, the available bandwidths of the jth link in the (i-1) th dynamic time slot and the (i '-1) th variable time slot are denoted as MD (j, i) and ME (j, i'), respectively, where MD (j, 1) and ME (j, 1) save the rated link available bandwidths at the initial time of the jth link; correspondingly, the reserved applications of the (i-1) th time slot and the (i '-1) th time slot of the dynamic time slot are respectively denoted as RD (i) and RE (i'), wherein the RD (1) and the RE (1) respectively store the reserved applications at the initial time, and the reserved applications are usedInitializing. The active time slot set of dynamic time slots is denoted as TDa and the active time slot set of variable time slots is denoted as TEa.

When the kth application R _k (src _k ,dest _k ,st _k ,et _k ,b _k ) When arriving, the resource reservation module may apply for the specific steps of:

step 1, a resource reservation module applies for a start time st _k And end time et _k Respectively reducing the time into integer times of time granularity downwards and upwards, inserting the time into a time array TD according to the size sequence, and inserting the original application time and the reduced time into a time array TE according to the size sequence;

Step 2, identifying all the active time slots TDa and TEa covered by the application, and then calculating whether the application bandwidth b is satisfied according to the resource matrix MD in each time slot of the TDa _k The method comprises the steps of carrying out a first treatment on the surface of the Application R is only applied when resources in all active time slots in TDa can meet the application bandwidth _k The application is successful, and the step 3 is carried out; otherwise, turning to step 4;

step 3, when applying R _k When the application is successful, the available bandwidths of the corresponding active time slots TDa and TEa of the resource matrix MD and ME are respectively updated, and the application R of the application success is applied _k Storing the reserved path information and bandwidth information in the RD and RE, storing the reserved path information and bandwidth information in a database, and turning to step 6;

step 4, judging whether the reserved application number stored by the TEa corresponding to the RE is smaller than the reserved application number stored by the TDa corresponding to the RD, and if so, turning to step 5; otherwise, go to step 6;

step 5, calculating whether the application bandwidth b is satisfied according to the resource matrix ME in each time slot of TEa in turn _k The method comprises the steps of carrying out a first treatment on the surface of the Application R is only applied when resources in all active time slots in TEa can meet the application bandwidth _k The application is successful, and the step 3 is carried out; otherwise, go to step 6;

step 6, entering a resource reservation application of the next application, and turning to step 1.

And S22, when the resource reservation request is met, the target controller configures reserved bandwidth for the resource reservation request, generates reserved resource information and generates application response information carrying the reserved resource information.

Specifically, on the premise of meeting the resource reservation request, the target controller configures reserved bandwidth for the resource reservation request. The target controller dynamically allocates a portion of the network bandwidth that is unused or temporarily unused to fulfill the new request.

After the bandwidth is allocated, the target controller generates reserved resource information, then compiles response information and transmits the information to the resource reservation composer. This reply message may be regarded as a kind of certificate, specifying the allocated bandwidth and other related resources. The entire request is only granted when all target controllers return reservation resource information.

Each target controller in the target controller set configures reserved bandwidth for the resource reservation request according to the network resource condition and generates application response information of the resource reservation request, the process realizes accurate and efficient resource management, and ensures that the multi-domain SDN network provides stable and high-quality service.

In a specific implementation of the present application, if there are sufficient network resources in the region, the controller returns a TRUE message; and after the resource reservation orchestrator receives the TRUE messages of all domains, entering an authorization stage. In the authorization phase, each controller uses the resource reservation access control module to calculate a two-layer or three-layer virtual circuit, configure switches on the path and allocate reserved bandwidth.

S23, when the resource reservation request is not satisfied, the target controller generates application response information which does not carry reserved resource information.

Specifically, if the target controller cannot meet the resource reservation request, for example, because network resources are insufficient or the requested bandwidth exceeds the target controller's limit, the target controller will generate an application reply message that does not contain reserved resource information. This application reply message will be fed back to the resource reservation orchestrator in order for the orchestrator to make the correct decisions, such as rescheduling, or cancel the resource reservation request. By the mechanism, the resource reservation system can manage and distribute network resources more effectively, and meanwhile, the robustness of the system is enhanced, so that the system can still operate normally under the condition of shortage of network resources.

In a specific implementation of the present application, if any area in the system does not have enough resources, the resource reservation composer will inform other areas to cancel the reserved resources, and return information of reservation failure to the user.

And S30, when the application response information of each target controller carries reserved resource information, the resource reservation composer generates a permission token for the resource reservation request and associates the permission token with the reserved resource information corresponding to each target controller.

Specifically, a user or service sends a resource reservation request to the system through a specific interface, explicitly identifying the type and amount of resources that need to be reserved. The resource reservation orchestrator receives the reservation request and processes the reservation request, including analyzing the request content and determining a set of target controllers. The resource reservation orchestrator then sends reservation requests to the target controllers. For this purpose, each target controller will configure a reserved bandwidth for the reservation request according to its own network resource status, and generate request response information of the request. The response information contains key information about reserved bandwidth, resource usage status and the like besides the response result.

After the response information of all the target controllers is collected and carries the reserved resource information, the resource reservation composer generates a permission token for the resource reservation request. Meanwhile, the reservation resource information corresponding to each target controller and the permission token are associated to form an explicit resource reservation relation. For example, the license token may be designed to carry details of reserved resources, including reserved bandwidth size, available duration, etc. in each SDN area or WAN.

The multi-domain SDN controller resource reservation method can ensure fair and effective utilization of network resources and provide powerful guarantee for efficient execution of large-scale tasks.

In a specific implementation of the present application, if there are sufficient network resources in the region, the controller returns a TRUE message; and after the resource reservation orchestrator receives the TRUE messages of all domains, entering an authorization stage. In the authorization phase, each controller uses the resource reservation access control module to calculate a two-layer or three-layer virtual circuit, configures switches on the path and allocates reserved bandwidth, allocates a VLAN ID for the request, and returns the VLAN ID to the resource reservation composer. The resource reservation orchestrator generates a token for the request and binds the token to all VLANs, while returning reserved token information to the user.

In another scenario, when the application response information of at least one controller does not carry the reserved resource information, the resource reservation composer notifies the controller that the application response information carries the reserved resource information to cancel the reserved bandwidth reserved for the resource reservation request, and feeds back the prompt information of failure reservation.

In the process of executing the resource reservation method of the multi-domain SDN controller, a situation may occur that a certain or some controllers cannot successfully reserve resources. For example, during peak hours of the network, some controllers may not be able to complete the reservation task for bandwidth due to excessive load. In this case, the resource reservation composer finds that the application response information sent from these controllers does not carry the reserved resource information, and further does not have to continue reserving the bandwidth reserved for the resource reservation request, and feeds back a notification of reservation failure to the user.

The resource reservation composer will inform the individual controllers that have successfully reserved bandwidth for the resource reservation request to cancel their reservation tasks. For example, ten controllers need to reserve bandwidth, but in actual operation, two controllers do not complete the reservation task, and for the resource orchestrator, this situation is already insufficient to meet the original resource reservation requirements. Therefore, the other eight controllers which have reserved the bandwidth are required to be informed to cancel the reservation task, the integration of network resources is ensured, and the waste of the whole network bandwidth caused by the reservation failure of part of controllers is avoided.

The resource reservation orchestrator needs to feed back prompt information of reservation failure to the user, so that the user can know the reserved state in time and re-apply for reservation tasks or adjust own network requirements.

The flexible and efficient reserved resource feedback mechanism provides more careful service experience for users, and simultaneously enhances the accuracy and practicability of network resource management.

S40, receiving a data stream by an SDN area controller in a target controller set, and verifying a permission token carried by the data stream by a resource reservation orchestrator; and providing the corresponding reserved bandwidth for the data flow when the verification is successful.

Specifically, the data flow refers to data flowing from a source node to a target node through an SDN (software defined network) intermediary. This may be data from one web server to the user's computer, or from one cloud server to another. The data flow is received by the SDN regional controller at the receiving end, and then the carried permission token is verified through the resource reservation orchestrator.

For example, an online streaming video is viewed on a home computer, and the data of the video is transmitted from the streaming server to your computer via the internet and your home router in a data stream. In this process, each piece of video data (i.e., a piece of data stream) is captured by the SDN controller and appropriately processed and distributed to ensure you can watch the video smoothly.

The task of the resource reservation orchestrator is to verify the permission tokens carried by these data flows. Because each data stream needs to have legal grants if it wants to utilize the reserved bandwidth. The license tokens are generated and issued by the resource reservation orchestrator after the resource reservation request is granted, each license token representing a certain network resource.

After the authentication process is passed, the data stream is entitled to use the reserved bandwidth corresponding thereto. After the token is successfully verified, the resource reservation composer can determine the legal identity of the data stream and automatically supply the corresponding reserved bandwidth to the data stream for use. The verification process enables management of network resources to be more automated and accurate, thereby helping to improve overall service quality and user satisfaction.

In a specific implementation of the present application, when the start time arrives, the sending end carries the allocated token to send the data stream, and after passing the authentication, the sending end sends the downstream table to the switch on the path and configures the queue at the corresponding port, and a specific communication process is as follows:

and step 1, transmitting the data stream information carrying the token to an area controller of the domain through a switch directly connected with the transmitting end.

And step 2, the regional controller sends the token to a resource reservation orchestrator, and the resource reservation orchestrator verifies the token and returns VLANs to the SDN controller.

Step 2.1, if the token is valid, entering a use stage. The controller installs a flow table on the access exchanger, the flow table uses reserved Vlan ID to identify the data packet; a flow table is issued on a switch through which a path passes, and bandwidth and a queue are configured; the border router is provided with a flow table, and the station Vlan ID is replaced with the WAN Vlan ID for outbound traffic, and vice versa for inbound traffic.

And 2.2, if not, rejecting the request.

The operation of the real-time verification and the resource control provides a more stable and effective working mechanism for the resource reservation method of the multi-domain SDN controller, and ensures reasonable utilization of network resources and guarantee of service quality.

In one implementation, the SDN area controller in the target controller set receives a data stream and verifies a permission token carried by the data stream through a resource reservation orchestrator; before providing the data stream with its corresponding reserved bandwidth upon successful authentication, the method further comprises:

s41, each target controller in the target controller set monitors a time difference value between a starting time corresponding to the resource reservation request and the current time;

and S42, when the time difference value meets a preset condition, and the target controller sets do not accept the data stream carrying the permission token corresponding to the resource reservation request, each target controller controls the reserved resource information corresponding to the resource reservation request.

Specifically, a time check step is included to enhance the stability and efficiency of the flow before providing reserved bandwidth for successfully authenticated data flows. First, in step S41, each controller in the target controller set listens for a time difference between the start time and the current time of the resource reservation request. For example, a resource reservation request may agree to begin using reserved bandwidth at a particular time, and the controller needs to monitor and compare the difference between the current time and the agreed time in real-time.

In step S42, when the time difference satisfies a certain preset condition, for example, the time difference is less than 5 minutes, which indicates that the resource reservation request is about to start, the controller needs to further control the reserved resource information. At this time, if the target controller set has not received the data stream carrying the grant token corresponding to the resource reservation request, each target controller needs to control the corresponding reserved resource.

In one specific implementation, taking mass data transfer as an example, a resource reservation request starts at a predetermined 8-point. When the time approaches 8 points, such as 7:55, i.e. the time difference is 5 minutes, the preset condition is satisfied, and the controller needs to pay attention to whether the corresponding permission token is received. If not, the controller will continue to reserve resources until a license token is received.

In an implementation manner of the embodiment of the present application, the multi-domain SDN controller resource reservation method further includes:

and S50, when the current time reaches the end time corresponding to the resource reservation request or the data stream carrying the permission token corresponding to the resource reservation request is transmitted, each target controller in the target controller set releases the reserved bandwidth corresponding to the resource reservation request.

Specifically, the release management process of the reserved bandwidth is specifically divided into two cases: firstly, the current time reaches the end time of the resource reservation request, and secondly, the data flow with the exclusive permission token is transmitted completely. For example, a company performs a huge data processing task at 9 to 17 peak times per day, and the time corresponding to the reservation request is set as this time period. Once the current time reaches 17, each controller in the target set of controllers needs to free up the corresponding reserved bandwidth even if the data stream is not fully transmitted, so that this portion of bandwidth can serve other users or tasks. Conversely, if the company's tasks have been completed completely before 17, then the data stream corresponding to the license token has been transmitted. At this time, each target controller can release the reserved bandwidth of the part in advance without waiting for the reserved end time.

The embodiment of the application considers the complete reserved bandwidth strategy, so that the resource reservation can meet the user demand, unnecessary bandwidth occupation can be avoided, the use efficiency of network resources is maximized, and the service experience is enhanced. In addition, when the transmission of the application reserved bandwidth data stream is finished, the controller deletes the stream table entry stored in the database before, issues a control instruction, deletes the stream table entry on the switch and releases the reserved bandwidth resource.

In one implementation manner of the embodiment of the present application, for a multi-domain SDN controller resource reservation method, when a target resource controller configures a reserved bandwidth for the resource reservation request, the target resource controller acquires an actual occupied bandwidth of a data stream corresponding to the resource reservation request in real time, and adjusts the reserved bandwidth and a shared bandwidth according to the actual occupied size; and the target resource controller updates the adjusted reserved bandwidth to each switch covered by the target resource controller and informs the resource reservation orchestrator of the adjusted shared bandwidth.

The target controller monitors the actual occupied bandwidth of the corresponding data stream in real time when configuring the reserved bandwidth for the resource reservation request. For example, an enterprise starts big data analysis at 9 a.m., approximately requiring 5GB of bandwidth, but this data changes as the analysis proceeds: there may be initially a larger amount of data processing and more bandwidth required, but over time the demand for bandwidth may be reduced.

The target controller can adjust the reserved bandwidth in real time according to the actual bandwidth occupation condition. For example, when the actual bandwidth requirement decreases, the controller decreases the reserved bandwidth, and converts the excess bandwidth into a shared bandwidth for other data streams. Conversely, when the actual bandwidth requirement increases, the controller dynamically increases the reserved bandwidth so as not to affect the normal operation of the data analysis task.

The mechanism for dynamically adjusting the reserved bandwidth and the shared bandwidth in real time can respond to the network demand change in time, accurately manage the bandwidth resources, fully exert the value of the network resources, ensure smooth operation of the service and improve the user experience.

In a specific implementation manner of the present application, the adjustment rule of the reserved bandwidth is:

Specifically, the boundary bandwidth provides bandwidth guarantees for bursty traffic. When the target resource controller receives the reservation request and completes its processing, on the premise of meeting the reservation request, certain adjustment needs to be performed on the reserved bandwidth. For example, assuming that the originally reserved bandwidth is 10Mbps, but the actual use request occupies only 6Mbps, the boundary bandwidth is 1Mbps, the controller needs to adjust the reserved bandwidth to 7Mbps, and the shared bandwidth to 3Mbps, so as to improve the resource utilization.

After the adjustment is completed, the target resource controller needs to update the adjusted reserved bandwidth information to each exchanger covered by the target resource controller in time. Therefore, when the data flow passes through the switches, the switches can correctly transmit data according to the new reserved bandwidth, and smooth operation of network services is ensured.

The target resource controller then feeds back the adjusted shared bandwidth information to the resource reservation scheduler for higher level resource management and scheduling. For example, the bandwidth of 3Mbps is increased on the basis of the original shared bandwidth, and the adjusted information needs to be timely notified to the resource reservation orchestrator, so that the resource reservation orchestrator can determine subsequent resource reservation and allocation according to the latest bandwidth information, thereby further ensuring the optimization of network resource utilization and the improvement of user service quality.

In summary, this embodiment provides a multi-domain SDN controller resource reservation method, where the resource reservation process is divided into resource application, resource authorization, resource usage and resource release phases by interaction of a resource reservation orchestrator, an SDN area controller and a WAN controller, each controller in a resource application node can audit a resource reservation request according to its own resource information, audit whether its own resource can meet the requirement of the resource reservation request, and authorize the resource when meeting the requirement, and at the same time, the resource reservation orchestrator receives response information returned by all the controllers for identifying success of authorization, and generates a permission token for the resource reservation request. In addition, in the resource using stage, the SDN area controller receives the data flow, verifies the permission token carried by the data flow through the resource reservation orchestrator, provides the corresponding reserved bandwidth for the data flow when the verification is successful, and releases the reserved bandwidth corresponding to the resource reservation request by each target controller when the current time reaches the end time recorded in the resource reservation request or the data flow carrying the permission token corresponding to the resource reservation request is transmitted completely. In summary, the present application aims to provide an efficient, flexible and accurate multi-domain SDN controller resource reservation method. By introducing the resource reservation orchestrator, the SDN regional controllers and the WAN controller, the full-flow optimization of resource reservation, the effective processing of concurrent reservation requests and the dynamic resource allocation are realized, the service quality of each service is ensured, and the use efficiency of network resources is improved. Specifically, after receiving the request, the orchestrator reasonably distributes resource reservation tasks to each target controller; each target controller configures reserved bandwidth for the request according to the network resource condition of the target controller and feeds back the reserved bandwidth; after collecting the feedback of all target controllers, the scheduler generates a permission token for the corresponding request, and the accuracy and rationality of resource use are ensured. Meanwhile, the invention adopts a strategy of real-time verification and timely release, so that the use of resource reservation is more accurate and flexible. Comprehensively, the multi-domain SDN controller resource reservation method disclosed by the application provides a high-efficiency and robust resource reservation solution for a large-scale and complex network environment.

Based on the above-mentioned method for reserving resources of a multi-domain SDN controller, this embodiment provides a system for reserving resources of a multi-domain SDN controller, as shown in fig. 3, where the system includes: a resource reservation orchestrator, a plurality of SDN area controllers, and a WAN controller; the SDN controllers and the WAN controllers are connected with the resource reservation arrangement, the SDN controllers are used for managing local area network resources, and the WAN controllers are used for managing WAN area resources;

Each SDN area controller and WAN controller are also configured to: acquiring the actual occupied bandwidth of the data stream corresponding to the resource reservation request in real time, and adjusting the reserved bandwidth and the shared bandwidth according to the actual occupied size; and updating the adjusted reserved bandwidths to each switch covered by each switch, and informing the resource reservation orchestrator of the adjusted shared bandwidths.

The multi-domain SDN controller resource reservation system further comprises a user interface in communication with the resource reservation orchestrator.

The main function of the user interface is to enable the user to directly submit and query the resource reservation request. In a specific implementation process, users can input information such as the number of resources that they need to reserve, the reserved time period, the reserved network range and the like through the interface, and the information can be directly sent to the resource reservation orchestrator.

After the resource reservation orchestrator obtains the information submitted by the user, the resource reservation orchestrator makes a decision on resource reservation according to the resource conditions of each SDN area controller and each WAN controller in the system, and feeds back the decision result and the state of the resource application to the user interface. The user interface feeds back the information to the user, so that the user knows whether the application of the user is successful or not, and obtains the license token and other related information when the application is successful.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims

1. A multi-domain SDN controller resource reservation method, characterized in that the method is applied to a multi-domain SDN controller resource reservation system, the multi-domain SDN controller resource reservation system comprising a resource reservation orchestrator, a plurality of SDN zone controllers and a WAN controller; the resource reservation method of the multi-domain SDN controller comprises the following steps:

2. The multi-domain SDN controller resource reservation method of claim 1, further comprising:

3. The multi-domain SDN controller resource reservation method of claim 1, wherein configuring a reserved bandwidth for the resource reservation request and generating application reply information of the resource reservation request by each target controller in the target controller set according to a network resource condition thereof specifically includes:

4. The multi-domain SDN controller resource reservation method of claim 1, wherein an SDN regional controller in the target controller set receives a data stream and verifies a permission token carried by the data stream by a resource reservation orchestrator; before providing the data stream with its corresponding reserved bandwidth upon successful authentication, the method further comprises:

5. The multi-domain SDN controller resource reservation method of claim 1, the method further comprising:

6. The multi-domain SDN controller resource reservation method of claim 1, the method further comprising:

7. The multi-domain SDN controller resource reservation method of claim 6, wherein the adjustment rule for reserved bandwidth is:

8. A multi-domain SDN controller resource reservation system, the system comprising: a resource reservation orchestrator, a plurality of SDN area controllers, and a WAN controller; the SDN controllers and the WAN controllers are connected with the resource reservation arrangement, the SDN controllers are used for managing local area network resources, and the WAN controllers are used for managing WAN area resources;

9. The multi-domain SDN controller resource reservation system of claim 8, wherein each SDN regional controller and WAN controller is further configured to: acquiring the actual occupied bandwidth of the data stream corresponding to the resource reservation request in real time, and adjusting the reserved bandwidth and the shared bandwidth according to the actual occupied size; and updating the adjusted reserved bandwidths to each switch covered by each switch, and informing the resource reservation orchestrator of the adjusted shared bandwidths.

10. The multi-domain SDN controller resource reservation system of claim 8, further comprising a user interface in communication with the resource reservation orchestrator.