CN109617778B - Method, device and system for realizing cross-domain two-layer network service - Google Patents

Abstract

Embodiments of the present invention provide a method, device, and system for implementing a cross-domain Layer 2 network service. The method includes: a centralized controller acquires link state information of multiple tunnel servers, wherein the multiple tunnel servers are distributed in multiple locations. In each local area network, each tunnel server is connected to the local gateway of the corresponding local area network; the centralized controller determines the transmission path information of the to-be-transmitted message according to the link state information of the multiple tunnel servers; The path information is sent to the local gateway of the corresponding local area network, so that the local gateway sends the to-be-transmitted message to the tunnel server of the local area network that receives the to-be-transmitted message according to the transmission path information determined by the centralized controller. The present application adopts multiple tunnel servers and local gateways distributed in multiple local area networks, and can automatically select an optimal path to transmit packets, thereby improving network quality and enhancing user experience.

Description

Method, device and system for realizing cross-domain layer 2 network service

technical field

The present invention relates to the field of communications, and in particular, to a method, device and system for implementing a cross-domain layer-two network service.

Background technique

Medium and large enterprises usually have multiple cross-regional office centers. Usually, these cross-regional office centers need to be able to access each other like a local area network, that is, there is a need for cross-regional Layer 2 networking.

In order to realize the large-scale Layer 2 networking, an NE is usually added at the network exit of each office center, and a tunnel is established between this NE and the network element equipment at the network exit of other office centers, and the two network elements in the enterprise are transmitted over the tunnel. Layer messages (that is, data frames at the data link layer). For example, when the enterprise uses the LTE mobile technology to form a network, the network element device may be a CPE (Customer Premise Equipment, client device). Figure 1 shows a conventional L2 service (ie, data link layer service) implementation method. As shown in Figure 1, there is usually a centralized LNS (L2TP Network Server, a network server using a Layer 2 channel protocol), which One end of the LNS is connected to the LAN of the enterprise headquarters, and the other end is connected to the CPE of each office center of the enterprise.

Among them, an IP tunnel is established between the CPE and LNS of each office center. When PC1 under enterprise branch 1 wants to communicate with PC5 under enterprise branch 2, the packets need to pass through the CPE in enterprise branch 1 first, and then the CPE The packet is encapsulated into a tunnel and transmitted to the LNS. The LNS decapsulates it and forwards it to the Intranet of the headquarters (that is, the intranet). After intranet switching, it is found that it needs to be forwarded to PC5 of enterprise branch 2, and then the packet is sent to the LNS. The LNS then performs tunnel encapsulation on the packet, and the peer end of the tunnel is the CPE of enterprise branch 2. After receiving the packet, the CPE of enterprise branch 2 decapsulates the tunnel packet and sends it to the corresponding PC5.

It should be noted that, as a tunnel server, the LNS is used to receive tunnel packets from the mobile network side (that is, each enterprise branch) on the one hand, decapsulate the tunnel packets and forward them to the local area network of the enterprise headquarters, and on the other hand receive tunnel packets from Packets on the LAN of the corporate headquarters are forwarded to the other end of the tunnel (CPE) after encapsulation through the tunnel.

It can be seen that this centralized deployment method has the following shortcomings: (1) The centralized LNS has a heavy load and needs to process all tunnel packets, including the encapsulation and decapsulation of tunnel packets. The packet is broadcast, and the LNS will encapsulate the packet into a tunnel packet and forward it to the CPEs of all enterprise branches; (2) Once the centrally deployed LNS fails, all L2 network services will be interrupted; (3) In centralized forwarding, there are a large number of detours, which increases the network load and increases the network transmission delay.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present invention provide a method, device and system for implementing a cross-domain Layer 2 network service, so as to improve network reliability and transmission efficiency, reduce network transmission delay, and thereby improve user experience.

In a first aspect, an embodiment of the present invention provides a method for implementing a cross-domain Layer 2 network service, including:

The centralized controller obtains the link state information of multiple tunnel servers, wherein the multiple tunnel servers are distributed and deployed in multiple local area networks to establish a tunnel between any two local area networks. Each tunnel server is connected to the local gateway of the corresponding local area network. connected;

The centralized controller determines the transmission path information of the to-be-transmitted packet according to the link state information of the multiple tunnel servers, wherein the to-be-transmitted packet is a packet transmitted from any one of the multiple local area networks to other local area networks, and the transmission path information is at least Including: address information of the tunnel server of the local area network that receives the message to be transmitted;

The centralized controller sends the transmission path information of the message to be transmitted to the local gateway of the corresponding local area network, wherein the local gateway of the corresponding local area network sends the message to be transmitted to the local area network receiving the message to be transmitted according to the transmission path information determined by the centralized controller tunnel server.

In a second aspect, an embodiment of the present invention provides a system for implementing a cross-domain Layer 2 network service, including:

Multiple tunnel servers, distributed in multiple LANs, are used to establish tunnels between any two LANs;

Multiple local gateways, distributed in multiple LANs, connected to tunnel servers in corresponding LANs;

The centralized controller is connected to multiple local gateways and tunnel servers respectively, and is used to obtain the link state information of multiple tunnel servers, determine the transmission path information of the to-be-transmitted packets according to the link state information of multiple tunnel servers, and Send the transmission path information of the message to be transmitted to the local gateway of the corresponding local area network, wherein the message to be transmitted is a message transmitted from any one of the multiple local area networks to other local area networks, and the transmission path information at least includes: receiving the message to be transmitted address information of the tunnel server of the local area network;

The local gateway of the corresponding local area network sends the message to be transmitted to the tunnel server of the local area network that receives the message to be transmitted according to the transmission path information determined by the centralized controller.

In a second aspect, an embodiment of the present invention provides a device for implementing a cross-domain Layer 2 network service, including:

The link state information acquisition module is used to acquire the link state information of multiple tunnel servers, wherein the multiple tunnel servers are distributed and deployed in multiple local area networks, and are used to establish a tunnel between any two local area networks. Connect to the local gateway of the corresponding local area network;

The transmission path determination module is used to determine the transmission path information of the to-be-transmitted packet according to the link state information of the multiple tunnel servers, wherein the to-be-transmitted packet is a packet transmitted from any one of the multiple local area networks to other local area networks, The transmission path information at least includes: address information of the tunnel server of the local area network that receives the message to be transmitted;

The message transmission module is used to send the transmission path information of the to-be-transmitted message to the local gateway of the corresponding local area network, wherein the local gateway of the corresponding local area network sends the to-be-transmitted message to the receiver that receives the to-be-transmitted message according to the determined transmission path information. Tunnel server for LAN

In a third aspect, embodiments of the present invention provide an electronic device, including a processor and a memory, where the memory is configured to store one or more computer instructions, wherein when the one or more computer instructions are executed by the processor An implementation method for implementing the cross-domain Layer 2 network service in the first aspect. The electronic device may also include a communication interface for communicating with other devices or a communication network.

An embodiment of the present invention provides a computer storage medium for storing a computer program, and the computer program enables a computer to implement the method for implementing the cross-domain Layer 2 network service in the first aspect above.

The method for implementing a cross-domain Layer 2 network service provided by the embodiment of the present invention adopts a distributed deployment method, and deploys multiple tunnel servers and local gateways in multiple local area networks that need to realize cross-domain connectivity, and is connected with the local gateway of each local area network. The connected centralized controller detects the link status information of the tunnel server of the corresponding LAN through the local gateway of each LAN, or connects with the tunnel server of each LAN, and directly obtains its own link status reported by the tunnel server of each LAN information, and then determine the transmission path information of the to-be-transmitted packet according to the acquired link state information of the tunnel server of each local area network. It is easy to note that the acquired link status information of each tunnel server includes but is not limited to the location information, capacity information, running status, delay information, link bandwidth, and load information of each tunnel server. Wherein, when determining the transmission path according to the link state information of each tunnel server, different parameter weights may be selected according to the actual situation to calculate the most suitable transmission path for transmitting the to-be-transmitted message.

When any one of the multiple local area networks that needs to be connected across domains needs to send a message to another local area network, it can send a path request to the centralized controller to obtain the most suitable transmission path for transmitting the message, and then use the most suitable transmission path. The transmission path transmits the message.

Compared with the traditional way of centrally deploying tunnel servers, the present application adopts multiple tunnel servers deployed in a distributed manner to dynamically adjust the transmission path, and avoids the risk of interruption of all network services due to failure of the centrally deployed tunnel servers. There is no need for centralized forwarding, which reduces detours, reduces network transmission delay, greatly improves network quality, and enhances user experience.

It should be noted that the tunnel server mentioned in this application may be an L2TP network server (L2TP Network Server, LNS); the local gateway may be a packet data gateway PGW (PDNGateway, namely Packet Data Network Gateway) of EPC (Evolved Packet Core), or The SGW (Serving Gateway) and the PGW are co-located and deployed. The PGW, as the egress gateway of the mobile network, is close to the eNodeB side during distributed deployment, or is co-located with the eNodeB. ) of the L3 (layer 3, that is, the network layer) data packets are forwarded to the Internet, or the L2 (layer 2, that is, the data link layer) tunnel packets are forwarded to the LNS, because they are close to the wireless side (eNodeB), hereinafter referred to as It is LGW (Local Gateway).

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of a conventional L2 service implementation principle;

2 is a schematic diagram of a system for implementing a cross-domain Layer 2 network service according to an embodiment of the present invention;

3 is a flowchart of a method for implementing a cross-domain Layer 2 network service according to an embodiment of the present invention;

4 is a flowchart of an optional implementation method of a cross-domain Layer 2 network service provided by an embodiment of the present invention;

5 is a flowchart of an optional implementation method for a cross-domain Layer 2 network service provided by an embodiment of the present invention;

FIG. 6 is a flowchart of a method for implementing an optional cross-domain Layer 2 network service provided by an embodiment of the present invention;

7 is a schematic diagram of a device for implementing a cross-domain Layer 2 network service according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an electronic device corresponding to the apparatus for implementing a cross-domain Layer 2 network service provided by the embodiment shown in FIG. 7 .

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a," "the," and "the" as used in the embodiments of the present invention and the appended claims are intended to include the plural forms as well, unless the context clearly dictates otherwise, "a plurality" Generally, at least two kinds are included, but the case of including at least one kind is not excluded.

It should be understood that the term "and/or" used in this document is only an association relationship to describe the associated objects, indicating that there may be three kinds of relationships, for example, A and/or B, which may indicate that A exists alone, and A and B exist at the same time. B, there are three cases of B alone. In addition, the character "/" in this document generally indicates that the related objects are an "or" relationship.

Depending on the context, the words "if", "if" as used herein may be interpreted as "at" or "when" or "in response to determining" or "in response to detecting". Similarly, the phrases "if determined" or "if detected (the stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (the stated condition or event)," depending on the context )" or "in response to detection (a stated condition or event)".

It should also be noted that the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a commodity or system comprising a list of elements includes not only those elements, but also includes not explicitly listed other elements, or elements inherent to the commodity or system. Without further limitation, an element defined by the phrase "comprising a..." does not preclude the presence of additional identical elements in the article or system that includes the element.

In addition, the sequence of steps in the following method embodiments is only an example, and is not strictly limited.

Before introducing the implementation method of the cross-domain Layer 2 network service provided by the embodiment of the present invention, some concepts involved in the subsequent embodiments and the basic principle of realizing the cross-domain Layer 2 network service are described.

Tunneling is a way of transferring data between networks by using the infrastructure of the Internet. The data transmitted through the tunnel can be data frames or data packets of different protocols. Tunneling technology is based on Layer 2 or Layer 3 tunneling protocols, among which the Layer 2 tunneling protocol corresponds to the data link layer of the OSI model, using frames as data exchange units, PPTP (Point-to-Point Tunneling Protocol), L2TP (No. Layer 2 Tunneling Protocol) and L2F (Layer 2 Forwarding Protocol) both belong to the Layer 2 Tunneling Protocol; the Layer 3 Tunneling Protocol corresponds to the network layer of the OSI model, using packets as data exchange units, IPIP (IP over IP) and IPSec The tunnel modes are all layer 3 tunneling protocols.

L2TP, the full name of Layer 2Tunneling Protocol, is a data link layer protocol. Use PPP protocol (Point to Point Protocol, that is, point-to-point protocol) to encapsulate data, and add additional headers for data transmission on the Internet.

LNS, the full name of L2TP Network Server, is the L2TP network server. It is a device on the PPP end system used to process the server-side part of the L2TP protocol. It is located on one side of the L2TP tunnel and is the counterpart of the LAC (L2TP Access Concentrator, L2TP Access Concentrator). The end device is the logical termination terminal of the PPP session tunneled by the LAC. The LAC encapsulates the packets received by the remote system into tunnel packets and sends them to the LNS. The LNS decapsulates the received tunnel packets and sends them to the remote system.

The large layer 2 network technology refers to the technology that uses the tunnel technology to realize the interconnection and intercommunication of the layer 2 network. The large second-layer network technology mentioned in this application refers to the use of the IP network Internet technology to realize the second-layer network expansion technology that spans the three-layer network. For example, through the CPE1 and CPE2 of enterprise branch 1 and enterprise branch 2 shown in Figure 1, tunnels are established with the LNS of the corporate headquarters LAN (that is, the intranet shown in Figure 1), respectively, and PC1 under enterprise branch 1 will report The packet is encapsulated into a tunnel packet and sent to the LNS through the tunnel between CPE1 and the LNS. The LNS decapsulates the received tunnel packet and forwards it to the LAN of the enterprise headquarters. When it is found that the packet is sent to the enterprise branch 2 In the case of PC5, the packet is encapsulated by LNS and sent to CPE2 of enterprise branch 2, so that CPE2 of enterprise branch 2 can send the decapsulated packet to PC5.

The existing large-scale Layer 2 network technology uses the centrally deployed LNS to forward tunnel packets, which not only cannot dynamically adjust the network, but also causes a heavy load on the centrally deployed LNS. Once the centrally deployed LNS fails, all L2 services may be affected. In addition, the centralized forwarding method has a large number of detours in the transmission process, which will increase the network load, increase the backbone network bandwidth and network transmission delay.

In order to solve the above problems, the present application applies SDWAN technology (Software-defined Wide Area Network) to the L2 service scenario of the mobile network, and adopts multiple LNSs and local gateways LGW that are distributed and deployed in multiple local area networks, so that automatic route selection can be realized. And select the optimal path to transmit packets, which can greatly improve network quality and enhance user experience.

FIG. 2 is a schematic diagram of a system for implementing a cross-domain Layer 2 network service provided by an embodiment of the present invention. As shown in FIG. 2 , the system may include: multiple tunnel servers (LNS1, LNS2, and LNS3 shown in FIG. 1 ) ), distributed in multiple LANs to establish a tunnel between any two LANs; multiple local gateways (LGW1, LGW2, LGW3, and LGW4 as shown in Figure 1), distributed in multiple LANs It is connected to the tunnel server of the corresponding local area network; the centralized controller is connected to multiple local gateways and tunnel servers respectively, and is used to obtain the link state information of multiple LNSs, and determine the to-be-transmitted according to the link state information of multiple LNSs. transmission path information of the message, and send the transmission path information of the message to be transmitted to the LGW of the corresponding local area network, wherein the message to be transmitted is a message transmitted from any one of the multiple local area networks to other local area networks, and the transmission path information is at least It includes: address information of the tunnel server of the local area network that receives the message to be transmitted; wherein, the local gateway of the corresponding local area network sends the message to be transmitted to the tunnel server of the local area network that receives the message to be transmitted according to the transmission path information determined by the centralized controller.

It should be noted that, according to the enterprise L2 business requirements, one LNS can be deployed in each enterprise branch, and each LNS is connected to the intranet of the enterprise. Optionally, the LNS and LGW are co-located and deployed. These LNSs share a virtual LNSIP for customer premises equipment (CPE) to establish L2 tunnels.

The centralized controller Controller is in charge of the global network topology, and controls each LGW, instructing the LGW to detect the path status of each LNS in real time (including one or more of the following information: delay to each LNS, each LNS load and bandwidth to each LNS), after the Controller collects this information, it calculates the optimal paths from each LGW to each LNS, and informs each LGW of these optimal paths. When the tunnel packets of the LNS IP address, they will be forwarded to the final LNS on the path according to the transmission path (for example, LGW1<->LGW2<->LGW4<->LNS3). This LNS will correctly process the tunnel packets and forward them to intranet.

In the above application scenario, the present application provides an embodiment of a method for implementing a cross-domain Layer 2 network service, which can be applied but not limited to the system shown in FIG. 2 . FIG. 3 is a flowchart of a method for implementing a cross-domain Layer 2 network service provided by an embodiment of the present invention. As shown in FIG. 3 , the method includes the following steps:

Step S301, the centralized controller acquires link state information of multiple tunnel servers, wherein the multiple tunnel servers are distributed and deployed in multiple local area networks to establish a tunnel between any two local area networks, and each tunnel server is connected to a corresponding local area network. connected to the local gateway.

Specifically, the centralized controller is connected to the local gateway of each local area network, and the local gateway of each local area network is connected to the tunnel server of the local area network. Therefore, as a first optional implementation manner, after the LGW of each local area network is deployed After that, the centralized controller can detect the link state information of the LNS of the corresponding local area network through the LGW of each local area network, so as to determine the transmission path information of the to-be-transmitted message according to the link state information of each LNS. The link state information may include, but is not limited to, at least one of the following: location information, capacity information, running state, delay information, link bandwidth, and load information of each tunnel server.

In the first optional implementation manner, when the centralized controller obtains the link status information of the LNS of the corresponding local area network through the LGW of each local area network, the centralized controller only needs to be connected to the LGW of each local area network, Specifically, the above step S301 may include the following steps: the centralized controller sends a path detection request to the local gateway of each local area network, wherein the path detection request is used to instruct the local gateway of each local area network to detect the link state information of the corresponding tunnel server, Wherein, the path detection request contains at least the network addresses of the multiple tunnel servers to be detected; the centralized controller receives the link state information of the tunnel servers detected by the local gateway of each local area network according to the path detection request.

Optionally, the above-mentioned path detection request may further include a detection period, so as to realize the purpose of periodically actively reporting the link status information of the LNS of the corresponding local area network to the centralized controller by the LGW. Specifically, the local gateway of each local area network sends a path detection request to the corresponding tunnel server according to the detection period to obtain the link state information of the corresponding tunnel server; and periodically reports the link state information of the corresponding tunnel server to the centralized controller.

It should be noted here that, since the centralized controller is only connected to the LGW of each local area network in the first embodiment, before the centralized controller acquires the link status information of multiple tunnel servers, the centralized controller can also configure Network topology information, and/or determine network topology information according to its own state information actively reported by the local gateway of each local area network, wherein the network topology information includes at least one of the following information of the local gateway of each local area network: location information, capacity information .

It is easy to note that since the LGW can only obtain the LNS's operating status, delay, link bandwidth and other status information, some status information (such as LNS capacity, load, location, etc.) used to calculate the transmission path may be obtained. not. Therefore, as a second optional implementation manner, the centralized controller may also be directly connected to the LNS of each local area network, and directly obtain the status information of each LNS from the open interface of each LNS.

In a second optional implementation manner, the centralized controller is respectively connected to the local gateway and the tunnel server of each local area network, so the centralized controller receives its own link state information reported by the tunnel server of each local area network. Specifically, when the centralized controller receives its own link state information reported by the tunnel server of each local area network, the centralized controller can send a service request to the tunnel server of each local area network, and receive the service request from the tunnel server of each local area network according to the service request. Returns its own link state information. Wherein, the service request is used to instruct the tunnel server of each local area network to report its own link state information;

Optionally, the above service request may include a reporting period, wherein the centralized controller receives the link status information returned by the tunnel server of each local area network according to the service request, including: the tunnel server of each local area network reports to the centralized control according to the reporting period. The switch periodically reports its own link status information.

It should be noted here that, in the second embodiment, the centralized controller is not only connected to the local gateway of each local area network, but also connected to the tunnel server of each local area network. Therefore, the centralized controller obtains multiple tunnel servers. Before the link state information is sent, the centralized controller can also determine the network topology information according to its own state information actively reported by the local gateway of each local area network and its own state information reported by the tunnel server of each local area network, wherein the network topology information includes At least one of the following information of the local gateway and tunnel server of each local area network: location information, capacity information.

Step S302, the centralized controller determines the transmission path information of the to-be-transmitted packet according to the link state information of the multiple tunnel servers, wherein the to-be-transmitted packet is a packet transmitted from any one of the multiple local area networks to other local area networks, and the transmission The path information at least includes: address information of the tunnel server of the local area network that receives the message to be transmitted.

Specifically, the centralized controller can automatically determine the transmission path information of the to-be-transmitted packets after acquiring the link status information of each tunnel server, or can also determine the transmission path information according to the path request sent by the local gateway of each local area network. The obtained link state information of each tunnel server determines the transmission path information of the to-be-transmitted message, wherein the path request is when the local gateway of each local area network receives the tunnel message sent by the client device of the corresponding local area network , the request sent to the centralized controller, the tunnel message is the tunnel message generated by the client device of the corresponding local area network encapsulating the message to be transmitted by using the virtual network address.

Step S303, the centralized controller sends the transmission path information of the message to be transmitted to the local gateway of the corresponding local area network, wherein the local gateway of the corresponding local area network sends the message to be transmitted to receive the message to be transmitted according to the transmission path information determined by the centralized controller. The tunnel server of the local area network of the text.

Specifically, after the transmission path information of the to-be-transmitted packet is determined, that is, the real LNS IP address for receiving the to-be-transmitted packet is determined, the destination address of the corresponding tunnel packet can be modified to this real LNS IP and forwarded to this LNS.

Optionally, the transmission path information determined by the centralized controller may be a path string, that is, other LGWs need to be passed before the instruction is directed to the optimal LNS. Therefore, the transmission path information determined by the centralized controller may also include messages to be transmitted. Address information of one or more local gateways through which the text passes during transmission.

In an optional implementation manner, when the centralized controller sends the transmission path information of the message to be transmitted to the local gateway of the corresponding local area network, the following steps may be included: the centralized controller sends the transmission path information of the message to be transmitted to the local gateway. Each local gateway that the to-be-transmitted message passes through during the transmission process; based on the transmission path information of the to-be-transmitted message, each local gateway that the to-be-transmitted message passes through during the transmission process adopts the local gateway or tunnel of the next transmission node The address of the server performs secondary encapsulation on the received message and transmits it to the local gateway or tunnel server of the next transit node.

In another optional implementation manner, when the centralized controller sends the transmission path information of the message to be transmitted to the local gateway of the corresponding local area network, the following steps may be included: the centralized controller sends the transmission path information of the message to be transmitted. To the first local gateway through which the message to be transmitted passes during the transmission process; based on the transmission path information of the message to be transmitted, for each local gateway that the message to be transmitted passes through during the transmission process, the destination address of the message is modified to The address of the local gateway or tunnel server of the next transport node, and transmitted to the local gateway or tunnel server of the next transport node.

Below, in order to better understand the present invention, according to the implementation scheme of the cross-domain Layer 2 network service provided by the present application, FIG. 4 , FIG. 5 and FIG. 6 show optional specific implementation manners.

Fig. 4 shows the specific flow of the scheme of multiple APNs and EPCs notifying LNS tunnel establishment, as shown in Fig. 4, including the following steps:

Step S400, topology reporting. After the LGW is deployed, each LGW actively sends a message to the centralized controller to inform the centralized controller of its own status information. The status information may include one or more of the following: functional characteristics, service capacity, location information . Step S400 is optional.

Step S401, topology management. That is, when the system is initialized, the centralized controller configures the network topology, or realizes automatic topology discovery through step S400.

Step S402, the centralized controller sends a path detection request to each LGW. The path detection request can be used to instruct the LGW to periodically detect the path status of each LNS. Optionally, the path detection request can carry multiple LNS IPs to be detected, and optionally, can also carry information such as the detection period duration .

Step S403, path detection. After receiving the path detection request from the centralized controller, the LGW of each local area network sends the path detection request to the LNS according to the detection period, and obtains the link status information of the LNS. The obtained information includes one or more of the following information: Type: whether the LNS is running normally, delay, link bandwidth, LNS capacity, and LNS location.

Step S404, the LGW of each local area network reports the detection result of the detection path to the centralized controller. The reporting method can be periodic reporting, or real-time reporting based on the path detection request of the centralized controller.

Step S405, the centralized controller returns the determined transmission path information to each LGW. Wherein, it can be actively pushed to each LGW through step S405a. It is also possible to return the transmission path information to each LGW when a path request is received through steps S405b1 and S405b2. Specifically, after receiving the L2 tunnel message sent by the CPE to the virtual LNS IP, the LGW of each local area network sends a path request to the centralized controller. The real IP is returned to the LGW. Specifically, the path detection result information previously reported by the LGW will be considered in the calculation, that is, information such as the running status, delay, capacity, bandwidth, and location of the LNS will be considered.

It is easy to note that the above two methods can be optional, wherein, in step S405, after the centralized controller obtains the path detection result reported by the LGW, it calculates the current most suitable LNS for each LGW and actively informs each LGW; and Steps S405b1 and S405b2 are passive. After receiving the request of the LGW, the most suitable LNS is selected and notified to the LGW.

Finally, when the LGW obtains the selected real LNS IP, it modifies the destination of the tunnel packet to this real LNS IP and forwards it to this LNS.

It should be noted that, in the embodiment shown in FIG. 4 , the centralized controller only controls the LGW, and in the embodiment shown in FIG. 5 , the centralized controller can control both the LGW and the LNS. The LNS of each local area network opens the interface to the centralized controller, and directly reports the relevant information to the centralized controller. Specifically, it includes the following steps:

Step S500, topology reporting. After the LGW and LNS are deployed, the LGW actively connects to the centralized controller to report its state information through step S500a, and the LNS actively connects to the centralized controller to report its own state information through step S500b, and the reported information includes one of the following types of information Or multiple: capability information (LGW or LNS), capacity information, location information.

Step S501, the centralized controller manages the information reported by the LGW and the LNS, and generates a logical topology network diagram for management.

Step S502, the centralized controller sends a path detection request to each LGW. The path detection request can be used to instruct the LGW to periodically detect the path status of each LNS. The centralized controller can periodically send an instruction, or it can inform the LGW for a period so that the LGW can periodically detect.

Step S503, path detection. The LGW of each LAN sends detection packets to the LNS to obtain the status and delay information of the LNS. Optionally, the probe can also be actively and periodically initiated.

Step S504, the LGW periodically sends the path detection result to the centralized controller. The information in the detection result includes, but is not limited to, one or more of the status, delay, and bandwidth of each LNS.

In steps S505 and S506, similar to step S502, the centralized controller may periodically send service requests to each LNS to query information such as service status and load of each LNS; it may also instruct the LNS to actively report these information periodically.

Step S507 is the same as step S405 shown in FIG. 4 . The transmission path information that can be determined by the centralized controller is actively pushed to each LGW through step S507a. It is also possible to return the transmission path information to each LGW when a path request is received through steps S507b1 and S507b2. After the LGW of each LAN receives the L2 tunnel message sent from the CPE to the virtual LNS IP, it sends a path request to the centralized controller. The centralized controller selects an optimal LNS by calculating the optimal path, and assigns the The real IP is returned to the LGW. Specifically, the path detection result information previously reported by the LGW may be considered in the calculation, that is, information such as the running state, delay, capacity, bandwidth, and location of the LNS may be considered.

It is easy to note that the above two ways can be optional, wherein, in step S507a, after the centralized controller obtains the path detection result reported by the LGW, it calculates the currently most suitable LNS for each LGW and actively informs each LGW; step S507b1 and S507b2 are passive, and after receiving the request of the LGW, the most suitable LNS is selected and notified to the LGW.

Similar to Embodiment 1, after the LGW obtains the selected real LNS IP, it modifies the destination of the tunnel packet to this real LNS IP and forwards it to this LNS.

The embodiment shown in FIG. 6 is similar to FIG. 4 and FIG. 5 , except that what the centralized controller calculates is a path string, and other LGWs need to pass through before indicating the optimal LNS. The specific process includes the following steps:

The contents executed in steps S600a, S600b, S601, S602, S603, S604, S605, and S606 are consistent with the descriptions of steps S500a, S500b, S501, S502, S503, S504, S505, and S506 shown in FIG. 5 .

Step S607, after receiving the path request, the centralized controller obtains a path string to the final LNS according to an algorithm. Taking the path string LGW1<->LGW3<->LNS3 shown in Figure 2 as an example, there are two processing methods as follows:

First, the centralized controller informs each LGW packet processing rule on the path, as shown in the figure above, it needs to inform LGW1 and LGW3. LGW1 re-encapsulates the tunnel packet with one layer of tunnel and forwards it to LGW3, and then LGW3 unencapsulates the tunnel according to the rules instructed by the centralized controller and forwards it to LNS3, that is, modify the destination IP of the tunnel packet to the actual IP of LNS3.

Second, the centralized controller only informs LGW1 of the path string and processing rules, that is, the step of step S607b2 shown in Figure 6 is optional. After LGW1 receives the message, it modifies the destination address of the tunnel message to that of LGW3. address and carry the path string in each tunnel message. After receiving the message, the LGW on the path obtains the path string and modifies the destination address to the next hop in the path string. This eventually goes to LNS3.

FIG. 7 is a schematic structural diagram of an apparatus for implementing a cross-domain Layer 2 network service according to an embodiment of the present invention. As shown in FIG. 7 , the apparatus includes: a link state information acquisition module 11 , a transmission path determination module 12 , and a packet Transmission module 13.

The link state information acquisition module 11 is used for acquiring link state information of multiple tunnel servers, wherein the multiple tunnel servers are distributed and deployed in multiple local area networks, and are used to establish a tunnel between any two local area networks. The server is connected to the local gateway of the corresponding local area network;

The transmission path determination module 12 is configured to determine the transmission path information of the to-be-transmitted packet according to the link state information of the multiple tunnel servers, wherein the to-be-transmitted packet is a packet transmitted from any one of the multiple local area networks to other local area networks , the transmission path information at least includes: address information of the tunnel server of the local area network that receives the message to be transmitted;

The message transmission module 13 is configured to send the transmission path information of the to-be-transmitted message to the local gateway of the corresponding local area network, wherein the local gateway of the corresponding local area network sends the to-be-transmitted message to receive the to-be-transmitted message according to the determined transmission path information The tunnel server for the local area network.

Optionally, the above-mentioned link state information acquisition module 11 is further configured to send a path detection request to the local gateway of each local area network, wherein the path detection request is used to instruct the local gateway of each local area network to detect the link state information of the corresponding tunnel server. , wherein the path detection request contains at least the network addresses of the multiple tunnel servers to be detected; the link state information of the tunnel servers detected by the local gateway of each local area network according to the path detection request, wherein the link state information includes the following At least one of: location information, capacity information, running state, delay information, link bandwidth, and load information of each tunnel server.

Optionally, the path detection request also includes a detection period, and the local gateway of each local area network sends a path detection request to the corresponding tunnel server according to the detection period to obtain the link status information of the corresponding tunnel server; The controller periodically reports the link status information of the corresponding tunnel server.

Optionally, the above device may further include: a network topology determination module, configured to configure network topology information, and/or determine network topology information according to its own state information actively reported by the local gateway of each local area network, wherein the network topology information includes: At least one of the following information of the local gateway of each local area network: location information, capacity information.

Optionally, the above-mentioned link state information obtaining module 11 is further configured to receive its own link state information reported by the tunnel server of each local area network.

Optionally, the above-mentioned link state information acquisition module 11 is further configured to send a service request to the tunnel server of each local area network, wherein the service request is used to instruct the tunnel server of each local area network to report its own link state information; The tunnel server of each local area network returns its own link state information according to the service request.

Optionally, the service request includes a reporting period, and the tunnel server of each local area network periodically reports its own link state information to the centralized controller according to the reporting period.

Optionally, the above-mentioned network topology determination module is also used for the centralized controller to determine network topology information according to its own state information actively reported by the local gateway of each local area network and its own state information reported by the tunnel server of each local area network, wherein the network The topology information includes at least one of the following information of the local gateway and tunnel server of each local area network: location information and capacity information.

Optionally, the above-mentioned message transmission module 13 is further configured to determine the transmission path information of the to-be-transmitted message according to the link state information of multiple tunnel servers in the case of receiving the path request sent by each local gateway, wherein , the path request is the request sent by the local gateway of each local area network to the centralized controller when it receives the tunnel message sent by the client device of the corresponding local area network, and the tunnel message is the virtual network address of the client device of the corresponding local area network. A tunnel packet is generated by encapsulating the packet to be transmitted.

Optionally, the transmission path information includes address information of one or more local gateways that the message to be transmitted passes through during the transmission process, and the above-mentioned message transmission module 13 is also used for the centralized controller to transfer the transmission path information of the message to be transmitted. It is sent to each local gateway that the message to be transmitted passes through during the transmission process; based on the transmission path information of the message to be transmitted, the local gateway of the next transmission node is used for each local gateway that the message to be transmitted passes through during the transmission process. or the address of the tunnel server to re-encapsulate the received message and transmit it to the local gateway or tunnel server of the next transmission node.

Optionally, the above-mentioned message transmission module 13 is further configured to send the transmission path information of the to-be-transmitted message to the first local gateway through which the to-be-transmitted message passes during the transmission process; based on the transmission path information of the to-be-transmitted message, Each local gateway that the message to be transmitted passes through in the transmission process changes the destination address of the message to the address of the local gateway or tunnel server of the next transmission node, and transmits it to the local gateway or tunnel server of the next transmission node.

The apparatus shown in FIG. 7 may execute the method of the embodiment shown in FIG. 3 to FIG. 6 . For the part not described in detail in this embodiment, reference may be made to the related description of the embodiment shown in FIG. 3 to FIG. 6 . For the execution process and technical effects of the technical solution, refer to the descriptions in the embodiments shown in FIG. 3 to FIG. 6 , which will not be repeated here.

The above describes the internal functions and structure of the device for implementing the cross-domain Layer 2 network service. In a possible design, the structure of the device for implementing the cross-domain Layer 2 network service can be implemented as an electronic device, for example, for managing network services As shown in FIG. 8 , the electronic device may include: a processor 21 and a memory 22 . Wherein, the memory 22 is used to store a program that supports the electronic device to execute the implementation method of the cross-domain Layer 2 network service provided in the embodiments shown in FIG. 3 to FIG. 6 , and the processor 21 is configured to execute all program stored in the memory 22.

The program includes one or more computer instructions, wherein the one or more computer instructions can realize the following steps when executed by the processor 21:

Acquire link state information of multiple tunnel servers, wherein the multiple tunnel servers are distributed and deployed in multiple local area networks to establish a tunnel between any two local area networks, and each tunnel server is connected to the local gateway of the corresponding local area network;

Determine the transmission path information of the to-be-transmitted packet according to the link status information of the multiple tunnel servers, wherein the to-be-transmitted packet is a packet transmitted from any one of the multiple local area networks to other local area networks, and the transmission path information at least includes: The address information of the tunnel server of the local area network to be transmitted;

The transmission path information of the message to be transmitted is sent to the local gateway of the corresponding local area network, wherein the local gateway of the corresponding local area network sends the message to be transmitted to the tunnel server of the local area network receiving the message to be transmitted according to the determined transmission path information.

Optionally, the processor 21 is further configured to execute all or part of the steps in the foregoing embodiments shown in FIG. 3 to FIG. 6 .

Wherein, the structure of the electronic device may further include a communication interface 23 for the electronic device to communicate with other devices or a communication network.

In addition, an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by an electronic device, which includes an implementation of a cross-domain Layer 2 network service for executing the method embodiments shown in FIG. 3 to FIG. 6 above. The procedures involved in the method.

The device embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

From the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by adding a necessary general hardware platform, and certainly can also be implemented by combining hardware and software. Based on this understanding, the above-mentioned technical solutions can be embodied in the form of computer products in essence or that contribute to the prior art. In the form of a computer program product embodied on a medium (including but not limited to disk storage, CD-ROM, optical storage, etc.).

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processor or other programmable cross-domain layer 2 network service implementation device to generate a machine that enables the computer or other programmable cross-domain layer 2 network The instructions executed by the processor of the enabling device of the service produce means for implementing the functions specified in the flow or flows of the flowcharts and/or the blocks or blocks of the block diagrams.

These computer program instructions can also be stored in a computer-readable memory capable of directing a computer or other programmable cross-domain layer 2 network service implementation device to work in a specific manner, so that the instructions stored in the computer-readable memory generate the instruction means An article of manufacture, the instruction means implementing the functions specified in the flow or flow of the flowchart and/or the block or blocks of the block diagram.

These computer program instructions can also be loaded on a computer or other programmable cross-domain layer 2 network service implementation device, so that a series of operation steps are performed on the computer or other programmable device to generate computer-implemented processing, so that the computer or other The instructions executing on the programmable device provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-persistent memory in computer readable media, random access memory (RAM) and/or non-volatile memory in the form of, for example, read only memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media includes both persistent and non-permanent, removable and non-removable media, and storage of information may be implemented by any method or technology. Information may be computer readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Flash Memory or other memory technology, Compact Disc Read Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

The present application discloses A1, a method for realizing a cross-domain Layer 2 network service, comprising:

The centralized controller obtains the link state information of multiple tunnel servers, wherein the multiple tunnel servers are distributed and deployed in multiple local area networks, and are used to establish a tunnel between any two local area networks. connected to the local gateway;

The centralized controller determines the transmission path information of the to-be-transmitted packet according to the link state information of the multiple tunnel servers, wherein the to-be-transmitted packet is transmitted from any one of the multiple local area networks to other local area networks message, the transmission path information at least includes: address information of the tunnel server of the local area network receiving the message to be transmitted;

The centralized controller sends the transmission path information of the message to be transmitted to the local gateway of the corresponding local area network, wherein the local gateway of the corresponding local area network sends the message to be transmitted according to the transmission path information determined by the centralized controller. The message is sent to the tunnel server of the local area network that receives the message to be transmitted.

A2. According to the method described in A1, the centralized controller is connected to the local gateway of each local area network, wherein the centralized controller obtains link state information of multiple tunnel servers, including:

The centralized controller sends a path detection request to the local gateway of each local area network, wherein the path detection request is used to instruct the local gateway of each local area network to detect the link state information of the corresponding tunnel server, wherein the The path detection request contains at least the network addresses of multiple tunnel servers to be detected;

The centralized controller receives the link state information of the tunnel server detected by the local gateway of each local area network according to the path detection request, wherein the link state information includes at least one of the following: location information of each tunnel server , capacity information, running status, delay information, link bandwidth, load information.

A3. The method according to A2, wherein the path detection request further includes a detection period, wherein the centralized controller receives the link state information of the tunnel server detected by the local gateway of each local area network according to the path detection request ,include:

The local gateway of each local area network sends a path detection request to the corresponding tunnel server according to the detection period to obtain the link state information of the corresponding tunnel server;

The local gateway of each local area network periodically reports the link state information of the corresponding tunnel server to the centralized controller.

A4. According to the method described in A2, before the centralized controller acquires the link state information of the multiple tunnel servers, the method further includes:

The centralized controller configures network topology information, and/or determines the network topology information according to its own state information actively reported by the local gateway of each local area network, wherein the network topology information includes the local gateway of each local area network. at least one of the following information: location information and capacity information.

A5. According to the method described in A1, the centralized controller is respectively connected to the local gateway and the tunnel server of each local area network, wherein the centralized controller obtains link status information of multiple tunnel servers, including:

The centralized controller receives its own link state information reported by the tunnel server of each local area network.

A6. According to the method of A5, the centralized controller receives its own link state information reported by the tunnel server of each local area network, including:

The centralized controller sends a service request to the tunnel server of each local area network, wherein the service request is used to instruct the tunnel server of each local area network to report its own link state information;

The centralized controller receives the link state information returned by the tunnel server of each local area network according to the service request.

A7. The method according to A6, wherein the service request includes a reporting period, wherein the centralized controller receives the link status information returned by the tunnel server of each local area network according to the service request, including:

The tunnel server of each local area network periodically reports its own link state information to the centralized controller according to the reporting period.

A8. According to the method of A5, before the centralized controller acquires the link state information of the multiple tunnel servers, the method further includes:

The centralized controller determines network topology information according to its own state information actively reported by the local gateway of each local area network and its own state information reported by the tunnel server of each local area network, wherein the network topology information includes each At least one of the following information of the local gateway and tunnel server of a local area network: location information and capacity information.

A9. According to the method described in any one of A1 to A8, the centralized controller determines the transmission path information of the to-be-transmitted packets according to the link state information of the multiple tunnel servers, including:

In the case of receiving the path request sent by each local gateway, the centralized controller determines the transmission path information of the to-be-transmitted packet according to the link state information of the multiple tunnel servers, wherein the path The request is a request sent by the local gateway of each local area network to the centralized controller in the case of receiving a tunnel message sent by a client device of the corresponding local area network, and the tunnel message is a client of the corresponding local area network. The end device uses the virtual network address to encapsulate the to-be-transmitted message to generate a tunnel message.

A10. The method according to A9, wherein the transmission path information includes address information of one or more local gateways through which the to-be-transmitted message passes during the transmission process, wherein the centralized controller stores the to-be-transmitted message The transmission path information of the message is sent to the local gateway of the corresponding LAN, including:

The centralized controller sends the transmission path information of the to-be-transmitted message to each local gateway through which the to-be-transmitted message passes during transmission;

Based on the transmission path information of the to-be-transmitted packet, each local gateway that the to-be-transmitted packet passes through in the transmission process uses the address of the local gateway of the next transmission node or the address of the tunnel server to perform a binary analysis on the received packet. It is encapsulated and transmitted to the local gateway or tunnel server of the next transport node.

A11. The method according to A9, wherein the transmission path information includes address information of one or more local gateways through which the to-be-transmitted message passes during the transmission process, wherein the centralized controller stores the to-be-transmitted message The transmission path information of the message is sent to the local gateway of the corresponding LAN, including:

The centralized controller sends the transmission path information of the to-be-transmitted message to the first local gateway through which the to-be-transmitted message passes during transmission;

Based on the transmission path information of the message to be transmitted, the destination address of the message is modified to the address of the local gateway or tunnel server of the next transmission node for each local gateway that the message to be transmitted passes through during the transmission process, and transmitted to the local gateway or tunnel server of the next transport node.

The present application discloses B12, a system for realizing cross-domain Layer 2 network services, comprising:

Multiple tunnel servers, distributed in multiple LANs, are used to establish tunnels between any two LANs;

Multiple local gateways, distributed in multiple LANs, connected to tunnel servers in corresponding LANs;

A centralized controller, connected to the multiple local gateways and the tunnel servers respectively, is used to obtain link state information of the multiple tunnel servers, and determine the transmission of the to-be-transmitted message according to the link state information of the multiple tunnel servers path information, and send the transmission path information of the to-be-transmitted packet to the local gateway of the corresponding local area network, wherein the to-be-transmitted packet is a packet transmitted from any one of the multiple local area networks to other local area networks, so The transmission path information at least includes: address information of the tunnel server of the local area network that receives the to-be-transmitted message;

Wherein, the local gateway of the corresponding local area network sends the to-be-transmitted message to the tunnel server of the local area network that receives the to-be-transmitted message according to the transmission path information determined by the centralized controller.

The present application discloses C13, a device for implementing a cross-domain Layer 2 network service, comprising:

A link state information acquisition module is used to acquire link state information of multiple tunnel servers, wherein the multiple tunnel servers are distributed and deployed in multiple local area networks, and are used to establish a tunnel between any two local area networks, each The tunnel server is connected to the local gateway of the corresponding local area network;

A transmission path determination module, configured to determine the transmission path information of the to-be-transmitted packet according to the link state information of the multiple tunnel servers, wherein the to-be-transmitted packet is any one of the multiple local area networks to the other The message transmitted by the local area network, the transmission path information at least includes: address information of the tunnel server of the local area network that receives the message to be transmitted;

The message transmission module is configured to send the transmission path information of the message to be transmitted to the local gateway of the corresponding local area network, wherein the local gateway of the corresponding local area network sends the message to be transmitted to the local gateway according to the determined transmission path information. A tunnel server of the local area network that receives the message to be transmitted.

The present application discloses D14, an electronic device, comprising: a memory and a processor; wherein,

The memory is used to store one or more computer instructions, wherein, when the one or more computer instructions are executed by the processor, the implementation of the cross-domain Layer 2 network service described in any one of A1 to A11 is realized method.

Claims (14)

1. A method for realizing cross-domain two-layer network service is characterized by comprising the following steps:

the method comprises the steps that a centralized controller obtains link state information of a plurality of tunnel servers, wherein the tunnel servers are distributed in a plurality of local area networks and used for establishing tunnels between any two local area networks, and each tunnel server is connected with a local gateway of the corresponding local area network; wherein the tunnel server comprises an LNS;

the centralized controller determines transmission path information of a message to be transmitted according to the link state information of the tunnel servers, wherein the message to be transmitted is a message transmitted from any one of the local area networks to other local area networks, and the transmission path information at least includes: receiving address information of a tunnel server of the local area network of the message to be transmitted; the message to be transmitted comprises an L2 layer message;

and the centralized controller sends the transmission path information of the message to be transmitted to a local gateway of a corresponding local area network, wherein the local gateway of the corresponding local area network sends the L2 tunnel message to a tunnel server of the local area network receiving the L2 tunnel message according to the transmission path information determined by the centralized controller.

2. The method of claim 1, wherein a centralized controller is connected to the local gateway of each lan, and wherein the acquiring, by the centralized controller, the link state information of the plurality of tunnel servers comprises:

the centralized controller sends a path detection request to a local gateway of each local area network, where the path detection request is used to instruct the local gateway of each local area network to detect link state information of a corresponding tunnel server, where the path detection request at least includes network addresses of a plurality of tunnel servers to be detected;

the centralized controller receives link state information of the tunnel server detected by the local gateway of each local area network according to the path detection request, wherein the link state information includes at least one of the following: position information, capacity information, running state, delay information, link bandwidth and load information of each tunnel server.

3. The method according to claim 2, wherein the path probing request further includes a probing period, and wherein the receiving, by the centralized controller, link state information of the tunnel server that is detected by the local gateway of each local area network according to the path probing request includes:

the local gateway of each local area network sends a path detection request to the corresponding tunnel server according to the detection period so as to acquire the link state information of the corresponding tunnel server;

and the local gateway of each local area network reports the link state information of the corresponding tunnel server to the centralized controller periodically.

4. The method of claim 2, wherein before the centralized controller obtains the link state information of the plurality of tunnel servers, the method further comprises:

the centralized controller configures network topology information, and/or determines the network topology information according to self state information actively reported by the local gateway of each local area network, wherein the network topology information includes at least one of the following information of the local gateway of each local area network: location information, capacity information.

5. The method of claim 1, wherein the centralized controller is connected to the local gateway and the tunnel server of each local area network, respectively, and wherein the acquiring, by the centralized controller, the link state information of the plurality of tunnel servers comprises:

and the centralized controller receives the self link state information reported by the tunnel server of each local area network.

6. The method according to claim 5, wherein the receiving, by the centralized controller, the own link state information reported by the tunnel server of each local area network includes:

the centralized controller sends a service request to the tunnel server of each local area network, wherein the service request is used for indicating the tunnel server of each local area network to report the link state information of the tunnel server;

and the centralized controller receives the link state information returned by the tunnel server of each local area network according to the service request.

7. The method of claim 6, wherein the service request includes a reporting period, and wherein the receiving, by the centralized controller, the link state information of the tunnel server of each local area network that returns to the centralized controller according to the service request includes:

and the tunnel server of each local area network reports the link state information of the tunnel server to the centralized controller periodically according to the reporting period.

8. The method of claim 5, wherein before the centralized controller obtains the link state information of the plurality of tunnel servers, the method further comprises:

the centralized controller determines network topology information according to the self state information actively reported by the local gateway of each local area network and the self state information reported by the tunnel server of each local area network, wherein the network topology information includes at least one of the following information of the local gateway and the tunnel server of each local area network: location information, capacity information.

9. The method according to any one of claims 1 to 8, wherein the determining, by the centralized controller, transmission path information of the packet to be transmitted according to the link state information of the plurality of tunnel servers includes:

and the centralized controller determines transmission path information of a message to be transmitted according to link state information of the tunnel servers under the condition that a path request sent by each local gateway is received, wherein the path request is a request sent to the centralized controller by each local gateway of the local area network under the condition that the local gateway of the local area network receives a tunnel message sent by client equipment of the corresponding local area network, and the tunnel message is a tunnel message generated by the client equipment of the corresponding local area network by encapsulating the message to be transmitted by adopting a virtual network address.

10. The method according to claim 9, wherein the transmission path information includes address information of one or more local gateways through which the packet to be transmitted passes in a transmission process, and wherein the sending, by the centralized controller, the transmission path information of the packet to be transmitted to the local gateways of the corresponding local area networks includes:

the centralized controller sends the transmission path information of the message to be transmitted to each local gateway through which the message to be transmitted passes in the transmission process;

and based on the transmission path information of the message to be transmitted, each local gateway which the message to be transmitted passes through in the transmission process carries out secondary packaging on the received message by adopting the address of the local gateway or the tunnel server of the next transmission node, and transmits the message to the local gateway or the tunnel server of the next transmission node.

11. The method according to claim 9, wherein the transmission path information includes address information of one or more local gateways through which the packet to be transmitted passes in a transmission process, and wherein the sending, by the centralized controller, the transmission path information of the packet to be transmitted to the local gateways of the corresponding local area networks includes:

the centralized controller sends the transmission path information of the message to be transmitted to a first local gateway through which the message to be transmitted passes in the transmission process;

and modifying the destination address of the message into the address of the local gateway or the tunnel server of the next transmission node based on the transmission path information of the message to be transmitted and each local gateway through which the message to be transmitted passes in the transmission process, and transmitting the address to the local gateway or the tunnel server of the next transmission node.

12. A system for implementing cross-domain two-layer network service is characterized by comprising:

the tunnel servers are distributed in the local area networks and used for establishing tunnels between any two local area networks; wherein the tunnel server comprises an LNS;

the local gateways are distributed in the local area networks and are connected with the tunnel servers of the corresponding local area networks;

the centralized controller is respectively connected with the local gateways and the tunnel servers, and is configured to acquire link state information of the tunnel servers, determine transmission path information of a to-be-transmitted message according to the link state information of the tunnel servers, and send the transmission path information of the to-be-transmitted message to the local gateways of corresponding local area networks, where the to-be-transmitted message is a message transmitted from any one of the local area networks to other local area networks, and the transmission path information at least includes: receiving address information of a tunnel server of the local area network of the message to be transmitted; the message to be transmitted comprises an L2 layer message;

and the local gateway of the corresponding local area network sends the L2 tunnel message to the tunnel server of the local area network receiving the L2 tunnel message according to the transmission path information determined by the centralized controller.

13. An apparatus for implementing a cross-domain two-layer network service, comprising:

the system comprises a link state information acquisition module, a link state information acquisition module and a link state information acquisition module, wherein the link state information acquisition module is used for acquiring link state information of a plurality of tunnel servers, the tunnel servers are distributed and deployed in a plurality of local area networks and are used for establishing tunnels between any two local area networks, and each tunnel server is connected with a local gateway of the corresponding local area network; wherein the tunnel server comprises an LNS;

a transmission path determining module, configured to determine transmission path information of a to-be-transmitted packet according to link state information of the tunnel servers, where the to-be-transmitted packet is a packet transmitted from any one of the local area networks to another local area network, and the transmission path information at least includes: receiving address information of a tunnel server of the local area network of the message to be transmitted; the message to be transmitted comprises an L2 layer message;

and the message transmission module is used for sending the transmission path information of the message to be transmitted to a local gateway of a corresponding local area network, wherein the local gateway of the corresponding local area network sends the L2 tunnel message to a tunnel server of the local area network receiving the L2 tunnel message according to the determined transmission path information.

14. An electronic device, comprising: a memory, a processor; wherein,

the memory is configured to store one or more computer instructions that, when executed by the processor, implement the method of implementing a cross-domain two-layer network service of any of claims 1-11.

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