CN117857637A

CN117857637A - Cross-border transmission optimization method based on SDWAN

Info

Publication number: CN117857637A
Application number: CN202311640405.7A
Authority: CN
Inventors: 张洪钏; 傅旭明; 戴捷; 李野; 单江华
Original assignee: Tianyi Cloud Technology Co Ltd
Current assignee: Tianyi Cloud Technology Co Ltd
Priority date: 2023-12-01
Filing date: 2023-12-01
Publication date: 2024-04-09

Abstract

The invention discloses a cross-border transmission optimization method based on an SDWAN, which relates to the technical field of computer network transmission, and the method uses a cross-border transmission optimization system based on the SDWAN, and the system comprises the following steps: the system comprises an SDWAN configuration management platform, a controller, a data receiving and transmitting module, a cross-border transmission optimization request module, a cross-border transmission optimization response module, a cross-border transmission optimization synchronization module and a cross-border transmission optimization strategy module, wherein the cross-border transmission request module needs to judge whether cross-border business requests a core POP or an overseas server, and after a target server is determined, subsequent access is completed. The cross-border transmission optimization method provided by the invention can realize the effect of optimizing the SDWAN cross-border transmission without changing the original terminal function, modifying the networking topology of the user and adding extra equipment. The method uses the core pop equipment to realize the function of the resource server, does not need to add other equipment in the SDWAN core networking, and is convenient to realize.

Description

Cross-border transmission optimization method based on SDWAN

Technical Field

The invention relates to the technical field of computer network transmission, in particular to a cross-border transmission optimization method based on an SDWAN.

Background

With the development of SDWAN, more and more enterprises choose to use SDWAN to build their own intranet. The SDWAN can easily implement enterprise application cloud entry and branch interconnection. Existing SDWAN solutions are spread throughout the world and cross-border intranet access may be achieved through the SDWAN. By draining off-shore access traffic to overseas sites, SDWAN-based cross-border access may be achieved.

With the increasing use of enterprise, the data to be transmitted is increasing in the process of implementing various services, which creates two main problems: 1. the expansion requirement of the bandwidth, the cross-border bandwidth needs to be a uniform cross-border private line, the private line is high in price, and most companies cannot pay the excessive cross-border bandwidth; 2. the link quality requirement and the cross-border traffic span half an earth, the electromagnetic propagation delay of the cross-border traffic spans hundreds of milliseconds, the specific propagation delay can reach two hundred milliseconds and three hundred milliseconds, the excessive delay can reduce the user experience, and the transmission speed is influenced, so that the transmission optimization of the cross-border traffic of the user through the SDWAN system is vital for the user to accept the SDWAN product.

While the SDWAN currently has a mainstream networking mode that is a mode of terminal equipment plus core equipment, the equipment is connected to the core equipment through a unified nanotube of a controller. The existing cross-border transmission optimization method mainly comprises the following steps: 1. use of an enlarged cross-border transmission bandwidth, particularly a cross-border private line bandwidth; 2. by classifying the accessed content, the static resource is cached in the transfer server, so that repeated transmission is reduced; 3. a wide area network transmission optimization method is used, and various transmission optimization algorithms are used for aiming at severe conditions of large time delay and packet loss of transmission, so that the network quality is improved. The cross-border scene has a great specific weight in the use scene of the SDWAN, the cross-border private line bandwidth is expensive, and in order to improve the utilization rate of the cross-border link, reduce the client cost, provide better cross-border experience and must realize the cross-border transmission optimization function. However, the following limitations are mainly involved in optimizing the cross-border transmission of the SDWAN traffic by using the methods:

1. the cross-border access experience of the user can be easily improved by improving the cross-border bandwidth. The main disadvantage of this method is the high price, which is not acceptable to the average company. This implementation is contrary to the high-quality and low-cost style of SDWAN masters. The user prefers to directly open the cross-border private line, and the advantages of the SDWAN network cannot be reflected;

2. a cross-border access acceleration method and device are used for realizing. When the user accesses the overseas website, the data of the overseas website accessed by the user is obtained. Wherein the website data is a website code. And converting the link address in the overseas website data, and caching the converted static resource to the transfer server. When the user accesses the corresponding overseas website again, the corresponding static resource is loaded from the transit server through the converted link address of the website. The method improves the loading speed of accessing static resources of the overseas website. The method has the defects of narrow application range and suitability for common website access;

3. by using a wide area network transmission optimization method, by grabbing each data packet, analyzing a transmission layer data set and an application layer data set carried in each data packet, and carrying out statistical analysis on a plurality of acquired transmission layer data sets and a plurality of application layer data sets to acquire statistical analysis results, wherein the considered factors comprise: the number of users, packet loss rate, delay, access content type and network type of different sites in different time periods. And determining a first transmission optimization algorithm according to the statistical analysis result. And optimizing the network of the first place in a first time period according to a first transmission optimization algorithm. According to the method, transmission optimization is carried out on different application environments by adopting different optimization algorithms, so that the optimization of the transmission network is more in line with the actual situation, the probability of occurrence of link packet loss and delay problems of the transmission network is reduced, and the network quality is improved. The method has the defects that the method only optimizes the transmission protocol, reduces the retransmission probability, better uses the existing bandwidth and does not essentially solve the problem of cross-border bandwidth occupation.

In view of the foregoing, there is a need for a transmission method capable of optimizing the transmission of the SDWAN cross-border traffic, reducing the cross-border bandwidth occupation, improving the application transmission quality, and reducing the customer use cost, so as to improve the customer SDWAN cross-border network service quality.

Disclosure of Invention

This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.

The present invention has been made in view of the above-mentioned problems with the existing SDWAN-based cross-border transmission optimization method.

Therefore, the invention aims to provide a cross-border transmission optimization method based on an SDWAN, and aims to design the cross-border transmission optimization method based on an SDWAN core networking function, so that the problem of insufficient cross-border bandwidth can be solved, and the transmission quality of an application can be improved. By storing the hot content on the core networking equipment, the user can access the cross-border resources nearby, a large amount of cross-border bandwidth is saved, and meanwhile, the cross-border access experience of the user can be ensured.

In order to solve the technical problems, the invention provides the following technical scheme: a method for optimizing cross-border transmission based on an SDWAN, the method using a cross-border transmission optimization system based on an SDWAN, the system comprising: the system comprises an SDWAN configuration management platform, a controller, a data transceiver module, a cross-border transmission optimization request module, a cross-border transmission optimization response module, a cross-border transmission optimization synchronization module and a cross-border transmission optimization strategy module;

the working flow of the method is as follows: the SDWAN configuration management platform is used for configuring a cross-border transmission optimization switch, and the configuration is issued to a user side intelligent gateway node, an access pop and a cross-border pop through the controller; meanwhile, the SDWAN configuration management platform also issues a cross-border transmission strategy to a cross-border pop; the controller commands the configuration interface to share variables with the processes of each module in the gateway node and the pop node, a user cross-border flow data packet is accessed to a user side gateway node, and the gateway node firstly stores the user data packet into a Linux user space memory by using the data transceiver module under the framework of the data plane development suite;

the cross-border transmission request module needs to judge whether the cross-border service requests a certain core POP or requests an overseas server, and the subsequent access is completed after the target server is determined;

firstly, the access pop equipment stores a user data packet into a Linux user space memory through a zero copy technology by utilizing the data transceiver module under a data plane development suite framework, and if the access destination of the cross-border traffic is the access pop, the access pop equipment directly uses a local storage resource to respond to the request; monitoring the forwarding flow of the local machine, finding out the flow transmitted from the cross-border pop to the intelligent gateway, and copying and storing resources;

firstly, the cross-border pop equipment stores a user data packet into a Linux user space memory through a zero-copy technology by utilizing the data transceiver module under the framework of the data plane development suite, and if the cross-border traffic access destination is the cross-border pop, the cross-border traffic access destination directly uses a local storage resource to respond to the request;

the cross-border transmission policy module is responsible for matching the policy and the cross-border traffic of the user, and when the traffic is found to be the traffic which the user needs to accelerate, the traffic is marked, and the information is stored and synchronized to the controller.

As a preferred scheme of the SDWAN-based cross-border transmission optimization method of the present invention, the method comprises: the objective of the cross-border transmission optimization request module is to identify cross-border transmission optimization traffic and return to a proper request server, and the specific processing flow comprises the following steps:

s1: the gateway node at the user side needs to acquire a current cross-border transmission optimization resource list from the controller;

s2: judging whether the user needs to request cross-border transmission optimized resources or not, and monitoring cross-border traffic of the user to match;

s3: selecting a proper response POP to a user when the cross-border transmission optimized resource list is found to be matched;

s4: the user requests data from the resource server.

As a preferred scheme of the SDWAN-based cross-border transmission optimization method of the present invention, the method comprises: when the cross-border transmission optimizing resource list is obtained from the controller, the resource POP synchronizes the newly added and deleted resource list to the controller, the controller receives the update and synchronously sends the updated resource list to the user side gateway node for starting the cross-border transmission optimizing function, and the user side gateway node stores the resource information in a hash mode.

As a preferred scheme of the SDWAN-based cross-border transmission optimization method of the present invention, the method comprises: when a user requests cross-border transmission to optimize resources, carrying out hash searching on the resources queried by the user, and if matching hits, needing to return specific resource POP information to the user; if the user does not hit, the user is allowed to go to the real server outside the environment for access.

As a preferred scheme of the SDWAN-based cross-border transmission optimization method of the present invention, the method comprises: when the most appropriate response POP is selected, the resources at the beginning are stored in a distributed mode. The controller synchronizes each piece of storage information to the user side gateway; when the user hits the resource, multiple address lists are seen; currently, an algorithm with shortest time delay is used, and the time delay information from a user side gateway to each resource POP is detected in real time; and selecting the response POP with the shortest time delay and returning the response POP to the user.

As a preferred scheme of the SDWAN-based cross-border transmission optimization method of the present invention, the method comprises: the resource server is an overseas real server or a response POP, and when a user requests data from the response POP, the real request address is the response POP.

As a preferred scheme of the SDWAN-based cross-border transmission optimization method of the present invention, the method comprises: the specific flow process of the cross-border transmission optimization synchronization module comprises the following steps:

s1: the cross-border transmission optimization synchronization module monitors the transmitted user traffic and checks whether the current traffic is a cross-border transmission optimized resource or not;

s2: the copy resource is stored locally, when the resource concerned by cross-border transmission optimization is found, the POP device performs mirror copy on the current flow

S3: generating a resource abstract to a controller, wherein the stored resource generates a resource abstract which contains an identifier of the resource, a POP (point of presence) equipment identifier, a local ip address and protocol port information, synchronizing the newly added message to the controller, and synchronizing the newly added message to all access side gateway equipment which opens a cross-border transmission optimization function through the controller;

s4: updating the resource score, and reflecting the heat of the resource through the resource score;

s5: judging whether the resource needs to be cleaned; the scoring of the resources is queried regularly, and the resources need to be deleted when the scoring of the resources is cleared.

As a preferred scheme of the SDWAN-based cross-border transmission optimization method of the present invention, the method comprises: the cross-border transmission optimized resource will be marked with a special mark in the transmission process, if the transmission server is the resource POP, the special mark will be given on the response POP, if the transmission server is the overseas server, the special mark will be added on the cross-border POP.

As a preferred scheme of the SDWAN-based cross-border transmission optimization method of the present invention, the method comprises: the cross-border transmission optimization strategy module receives user configuration from the SDWAN configuration management platform, and the specific flow comprises the following steps:

s1: acquiring cross-border transmission optimization configuration;

s2: judging whether the strategy is matched or not, and judging whether the connection hits the cross-border transmission optimization strategy configured by the user or not when the user requests the resource;

s3: creating a connection session, creating the session for requesting the connection of the cross-border transmission optimization strategy, recording connection information through the session, and continuing to operate after responding;

s4: and adding a cross-border transmission optimization identifier, and for the response data packet, firstly, inquiring session information, and after a session is hit, confirming that the data packet is a data packet matching with a cross-border transmission optimization strategy of a user.

As a preferred scheme of the SDWAN-based cross-border transmission optimization method of the present invention, the method comprises: the cross-border transmission optimization response module operates on a POP, wherein the POP is deployed by a cloud server, and sufficient resources are provided for resource storage and response resource requests.

The invention has the beneficial effects that:

1. the cross-border transmission optimization method based on the SDWAN provided by the invention can realize the cross-border transmission optimization effect of the SDWAN without changing the original terminal function, modifying the networking topology of the user and adding extra equipment. The method uses the core pop equipment to realize the function of the resource server, does not need to add other equipment in the SDWAN core networking, and is convenient to realize. The core pop equipment uses a cloud deployment scheme, so that the expansion is convenient;

2. the cross-border resource expected by the user is determined through the cross-border transmission identification function, and the method has wide applicability and specific service function decoupling. The cross-border transmission identification has two scenes, namely, the data packet needs to be identified, one is the first cross-border access, and the cross-border transmission optimization strategy module needs to identify the response message; the other is to identify the returned packet in response to the POP. The POP equipment on the transmission path can identify the identification and process response;

3. the invention responds to the cross-border transmission request of the user through the nearest core pop, thereby fundamentally solving the problem of insufficient cross-border bandwidth. A cross-border resource of interest to a user may be stored by multiple core pop devices, and in the cross-border transmission optimization request module, the core pop device closest to the cross-border transmission optimization request module needs to be selected. The nearest transmission distance also means lower transmission delay, so that the user can have better network experience;

4. the invention realizes the copying of the resources in a copying mode, realizes the nearby acquisition of the resources by the users in a request jump mode, has no perception of the users in two modes, and obtains the cross-border resources by monitoring the forwarded traffic in the core pop including the access pop and the cross-border pop, thereby reducing the overall network load. At the access gateway device, the user's cross-border request is skipped and the user is unaware that the cross-border resource was transmitted from the nearby pop device.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:

FIG. 1 is a block diagram of the overall structure of an SDWAN-based cross-border transmission optimization system according to the present invention;

FIG. 2 is a flowchart illustrating a process of a cross-border transmission optimization request module in a cross-border transmission optimization method based on an SDWAN according to the present invention;

FIG. 3 is a process flow diagram of a cross-border transmission optimization synchronization module in a cross-border transmission optimization method based on an SDWAN according to the present invention;

fig. 4 is a process flow diagram of a cross-border transmission optimization policy module in a cross-border transmission optimization method based on an SDWAN according to the present invention.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.

Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Referring to fig. 1-4, for one embodiment of the present invention, there is provided a cross-border transmission optimization method based on an SDWAN, which uses a cross-border transmission optimization system based on an SDWAN, the system comprising: the system comprises an SDWAN configuration management platform, a controller, a data transceiver module, a cross-border transmission optimization request module, a cross-border transmission optimization response module, a cross-border transmission optimization synchronization module and a cross-border transmission optimization strategy module;

the working flow of the method is as follows: the SDWAN configuration management platform is used for configuring a cross-border transmission optimization switch, and the configuration is issued to the intelligent gateway node, the access pop and the cross-border pop at the user side through the controller; meanwhile, the SDWAN configuration management platform also issues a cross-border transmission strategy to a cross-border pop; the controller commands the configuration interface to share variables with the processes of each module in the gateway node and the pop node, the user cross-border flow data packet is accessed to the gateway node at the user side, and the gateway node firstly stores the user data packet into the Linux user space memory by using a data transceiver module under the framework of the data plane development suite;

firstly, the access pop equipment stores a user data packet into a Linux user space memory through a zero-copy technology by utilizing a data transceiver module under a data plane development suite framework, and if the access destination of the cross-border traffic is the access pop, the access pop equipment directly uses a local storage resource to respond to the request; monitoring the forwarding flow of the local machine, finding out the flow transmitted from the cross-border pop to the intelligent gateway, and copying and storing resources;

firstly, a data receiving and transmitting module under a data plane development suite framework is utilized by the cross-border pop equipment to store a user data packet into a Linux user space memory through a zero-copy technology, and if a cross-border traffic access destination is a cross-border pop, a local storage resource is directly used for responding to a request;

the cross-border transmission policy module is responsible for matching the policy of the user with the cross-border traffic, and when the traffic is found to be the traffic which the user needs to accelerate, the traffic is marked, and the information is stored and synchronized to the controller.

The objective of the cross-border transmission optimization request module is to identify cross-border transmission optimization traffic and return to a proper request server, and the specific processing flow comprises the following steps:

s1: the user side gateway node needs to acquire the current cross-border transmission optimization resource list from the controller, the resource POP synchronizes the newly added and deleted resource list to the controller, the controller receives the update and synchronously sends the updated resource list to the user side gateway node which starts the cross-border transmission optimization function, and the user side gateway node stores the resource information in a hash mode, so that the user can conveniently and quickly search when accessing.

S2: judging whether the user needs to request cross-border transmission optimized resources, monitoring cross-border traffic of the user to perform matching, performing hash searching on the resources queried by the user, and if the matching hits, returning specific resource POP information to the user; if the user does not hit, the user is allowed to go to the real server outside the environment for access.

S3: when the cross-border transmission optimized resource list is found to be matched, a proper response POP is selected to the user, and the hot resources are stored in a distributed mode. The controller synchronizes each piece of storage information to the user side gateway; when the user hits the resource, multiple address lists are seen; currently, an algorithm with shortest time delay is used, and the time delay information from a user side gateway to each resource POP is detected in real time; and selecting the response POP with the shortest time delay and returning the response POP to the user.

S4: the user requests data from the resource server, the resource server is an overseas real server or a response POP, when the user requests data from the response POP, the real request address is the response POP, the user does not feel when using, the response POP requests data faster, and the user experience is better.

Specifically, the specific flow process of the cross-border transmission optimization synchronization module comprises the following steps:

s1: the cross-border transmission optimization synchronization module monitors the transmitted user traffic, and checks whether the current traffic is a cross-border transmission optimized resource, wherein the cross-border transmission optimized resource is added with a special mark in the transmission process, if a transmitted server is a resource POP, the special mark is added to the server which is transmitted if the transmitted server is an overseas server on the response POP, and the special mark is added to the cross-border POP.

S2: the copy resource is stored locally, when the resource concerned by cross-border transmission optimization is found, the POP equipment can mirror copy the current flow, the copied resource can be stored locally, and the original data packet can be forwarded normally without influencing the use of clients.

s4: the resource score is updated, and the heat of the resource is reflected by the resource score, and the influencing factors of the resource score include, but are not limited to, content size, access amount, access change rate and the like. By taking the above factors into consideration, a final score for the resource can be calculated by adding a certain weight ratio.

S5: judging whether the resource needs to be cleaned; the scoring of the resources is queried regularly, and the resources need to be deleted when the scoring of the resources is cleared. Because the local space is limited, instant cleaning of rarely accessed resources can reduce POP pressure. After deleting the resource, the abstract of the deleted information needs to be synchronously sent to the controller. The digest information needs to contain the resource identifier and POP device identifier.

Specifically, the cross-border transmission optimization policy module receives user configuration from the SDWAN configuration management platform, and the cross-border access traffic is numerous, and only traffic most concerned by the user can be selected for cross-border transmission optimization. Policy matching is carried out before the user carries out cross-border access, special identification is added to the matched flow, the subsequent cross-border transmission optimization synchronization module is convenient to acquire resources, and the specific flow comprises the following steps:

s1: acquiring cross-border transmission optimization configuration; the user may issue cross-border transmission optimization policy configurations at the SDWAN configuration management platform. Defining user resources from multiple dimensions is supported, including five tuples, domain names, and so forth. Regular matching is supported for the resources of the string class.

S2: judging whether the strategy is matched or not, and judging whether the connection hits the cross-border transmission optimization strategy configured by the user or not when the user requests the resource; the user request information is retrieved using an efficient matching algorithm for string matching. The access to the miss policy is released directly and the connection to the hit policy continues to follow-up flow.

S3: establishing a connection session, wherein the session is required to be established for requesting the connection of the cross-border transmission optimization strategy, the user request can hit the strategy, the corresponding response data packet can not necessarily hit the strategy, the connection information is recorded through the session, and the operation is continued after the response is arrived;

s4: and adding a cross-border transmission optimization identifier, and for the response data packet, firstly, inquiring session information, and after a session is hit, confirming that the data packet is a data packet matching with a cross-border transmission optimization strategy of a user. At this time, a cross-border transmission optimization identifier needs to be added, so that the cross-border transmission optimization synchronization module of the cross-border pop and the access pop can be conveniently processed.

Specifically, the cross-border transmission optimization response module operates on the POP, and functions similar to a server, wherein the POP is deployed by a cloud server, has sufficient resources for storing resources and responding to resource requests, and can be conveniently expanded when a user needs more resources. And a special mark for cross-border transmission optimization can be marked in the response data, so that the POP equipment for midway transmission can conveniently copy resources.

In summary, in the invention, when the session is extracted, a hash structure is established, the key is the IP five-tuple and the output interface of the stream, the value is the storage position of the stream, when the data packet arrives, the data packet is processed immediately after the corresponding key-value is inquired, and the message processing efficiency is improved;

the cross-border resource expected by the user is determined through the cross-border transmission identification function, and the method is wide in applicability and specific in service function decoupling. The cross-border transmission identification has two scenes, namely, the data packet needs to be identified, one is the first cross-border access, and the cross-border transmission optimization strategy module needs to identify the response message; the other is to identify the returned packet in response to the POP. The POP equipment on the transmission path can identify the identification and process response;

the problem of insufficient cross-border bandwidth is fundamentally solved by responding to the cross-border transmission request of the user through the latest core pop. A cross-border resource of interest to a user may be stored by multiple core pop devices, and in the cross-border transmission optimization request module, the core pop device closest to the cross-border transmission optimization request module needs to be selected. The nearest transmission distance also means lower transmission delay, so that the user can have better network experience;

copying the resource by a copying mode, and obtaining the resource nearby by a user by a request jump mode. Neither way is the user perceived. In the core pop, including the access pop and the cross-border pop, the cross-border resource is obtained by monitoring the forwarded traffic, so that the overall network load can be reduced. At the access gateway device, the user's cross-border request is skipped and the user is unaware that the cross-border resource was transmitted from the nearby pop device.

The resources are scored by different factors of the resources, and the resources are deleted when the score is cleared, so that the problems of slow inquiry or insufficient storage space caused by excessive cache resources are prevented. Influencing factors for resource scoring include, but are not limited to, content size, access volume, access rate of change, and the like. By taking the above factors into consideration, a final score for the resource can be calculated by adding a certain weight ratio. The heat of a resource can be reflected by the resource score.

And realizing the synchronization of the resource storage information through the controller. The stored information and deleted information of the resource are synchronized to all access gateway devices at once. All access gateways and core pop devices of the controller nanotubes are natural configuration transmission channels between different devices. The difficulty of synchronizing information among different devices can be reduced by reasonably using the controller, and the accuracy of requesting jump is improved.

It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.

Claims

1. A method for optimizing cross-border transmission based on an SDWAN, the method using a cross-border transmission optimization system based on an SDWAN, the system comprising: the system comprises an SDWAN configuration management platform, a controller, a data transceiver module, a cross-border transmission optimization request module, a cross-border transmission optimization response module, a cross-border transmission optimization synchronization module and a cross-border transmission optimization strategy module;

2. The method for optimizing cross-border transmission based on an SDWAN as claimed in claim 1, wherein: the objective of the cross-border transmission optimization request module is to identify cross-border transmission optimization traffic and return to a proper request server, and the specific processing flow comprises the following steps:

s4: the user requests data from the resource server.

3. The method for optimizing cross-border transmission based on an SDWAN according to claim 2, wherein: when the cross-border transmission optimizing resource list is obtained from the controller, the resource POP synchronizes the newly added and deleted resource list to the controller, the controller receives the update and synchronously sends the updated resource list to the user side gateway node for starting the cross-border transmission optimizing function, and the user side gateway node stores the resource information in a hash mode.

4. A cross-border transmission optimization method based on SDWAN as defined in claim 3, wherein: when a user requests cross-border transmission to optimize resources, carrying out hash searching on the resources queried by the user, and if matching hits, needing to return specific resource POP information to the user; if the user does not hit, the user is allowed to go to the real server outside the environment for access.

5. The method for optimizing cross-border transmission based on an SDWAN of claim 4, wherein: when the most appropriate response POP is selected, the resources at the beginning are stored in a distributed mode. The controller synchronizes each piece of storage information to the user side gateway; when the user hits the resource, multiple address lists are seen; currently, an algorithm with shortest time delay is used, and the time delay information from a user side gateway to each resource POP is detected in real time; and selecting the response POP with the shortest time delay and returning the response POP to the user.

6. The method for optimizing cross-border transmission based on SDWAN of claim 5, wherein: the resource server is an overseas real server or a response POP, and when a user requests data from the response POP, the real request address is the response POP.

7. A method for optimizing cross-border transmission over an SDWAN as defined in any one of claims 1-6, wherein: the specific flow process of the cross-border transmission optimization synchronization module comprises the following steps:

8. The method for optimizing cross-border transmission based on SDWAN of claim 7, wherein: the cross-border transmission optimized resource will be marked with a special mark in the transmission process, if the transmission server is the resource POP, the special mark will be given on the response POP, if the transmission server is the overseas server, the special mark will be added on the cross-border POP.

9. The method for optimizing cross-border transmission based on SDWAN of claim 8, wherein: the cross-border transmission optimization strategy module receives user configuration from the SDWAN configuration management platform, and the specific flow comprises the following steps:

s1: acquiring cross-border transmission optimization configuration;

10. The method for optimizing cross-border transmission based on SDWAN of claim 9, wherein: the cross-border transmission optimization response module operates on a POP, wherein the POP is deployed by a cloud server, and sufficient resources are provided for resource storage and response resource requests.