CN111182016B - PPPoE dialing message transmission method and device - Google Patents

Abstract

The invention discloses a PPPoE dialing message transmission method and a device, wherein the method comprises the following steps: a first network device receives a point-to-point communication protocol PPPoE message based on the Ethernet; if the length of the PPPoE message is smaller than or equal to a preset message threshold value, the first network equipment encapsulates the PPPoE message into the NVGRE tunnel message; and the first network equipment determines the NVGRE tunnel corresponding to the TNI, and sends the NVGRE tunnel message to second network equipment corresponding to the destination IP address through the NVGRE tunnel.

Description

A PPPoE dial-up message transmission method and device

technical field

The invention relates to the field of network transmission, in particular to a PPPoE dial-up message transmission method and device.

Background technique

The Ethernet-based point-to-point communication protocol (Point to Point Protocol over Ethernet, PPPoE) is a protocol for transmitting data on the Ethernet according to the point-to-point protocol, and the protocol can provide good access control and billing functions. However, the PPPoE protocol is a Layer 2 protocol, so it can only transmit packets based on the Layer 2 network, and cannot perform Layer 3 forwarding. Its server can only be deployed on the Layer 2 network. With the rise of software-defined networking (Software Defined Networking, SDN) technology, centralized management and control has gradually become the mainstream. In the SDN scenario, some network devices that carry control functions, such as PPPoE servers, are changed from the original two-layer network deployment to three-layer network deployment. cluster deployment. However, the PPPoE protocol belongs to the two-layer protocol and does not support three-layer forwarding. Under the existing technology, between a layer-1 network device and a layer-3 network device, such as between a client in a layer-1 network and a PPPoE server in a layer-3 network , PPPoE packets cannot be transmitted.

Therefore, in the prior art, in an SDN scenario, it is an urgent problem to be solved that PPPoE packets cannot be transmitted between layer 1 and layer 2 network devices and layer 3 network devices.

Contents of the invention

The embodiment of the present application provides a PPPoE message transmission method and device, which solves the problem that in the prior art, in the SDN scenario, PPPoE message transmission cannot be performed between the first-layer and second-layer network equipment and the third-layer network equipment. The problem.

The embodiment of the present invention provides a PPPoE packet transmission method, the method comprising:

The first network device receives the Ethernet-based point-to-point communication protocol PPPoE message;

If the length of the PPPoE packet is less than or equal to the preset packet threshold, the first network device encapsulates the PPPoE packet into the NVGRE tunnel packet; the NVGRE tunnel packet includes the NVGRE tunnel packet The destination IP address of the document and the tenant network identifier TNI, and the TNI corresponds to an NVGRE tunnel;

The first network device determines the NVGRE tunnel corresponding to the TNI, and sends the NVGRE tunnel packet to the second network device corresponding to the destination IP address through the NVGRE tunnel.

Optionally, the method also includes:

If the length of the PPPoE message is greater than the preset message threshold, the first network device divides the PPPoE message into N PPPoE sub-messages, and encapsulates each of the PPPoE sub-messages is the NVGRE tunnel message; wherein, the length of each PPPoE sub-message is less than or equal to the preset message threshold; N is an integer greater than 1.

Optionally, the method includes:

If the first network device is a network virtualization edge NVE device, the second network device is a PPPoE server cluster; if the first network device is the PPPoE server cluster, the second network device is the NVE equipment.

Optionally, the method includes:

The NVGRE tunnel message also includes an outer Ethernet header and an inner Ethernet header; the outer Ethernet header includes the source physical address of the PPPoE message and the destination physical address of the PPPoE message; the The memory Ethernet header includes the source physical address of the NVGRE tunnel message and the destination physical address of the NVGRE tunnel message.

The embodiment of the present invention provides a PPPoE packet transmission method, the method comprising:

The second network device receives the network virtualization NVGRE tunnel packet sent by the first network device through the NVGRE tunnel using general routing encapsulation; the NVGRE tunnel packet includes the destination IP address and the tenant network identifier of the NVGRE tunnel packet TNI; the NVGRE tunnel corresponds to the TNI;

The second network device decapsulates the NVGRE tunnel message into a PPPoE message, and determines the length of the PPPoE message;

If the destination IP address is different from the IP address of the second network device, or the length of the PPPoE packet is greater than a preset packet threshold, the second network device discards the NVGRE tunnel packet.

Optionally, the method includes:

The second network device obtains the TNI from the NVGRE tunnel message, and determines the bandwidth fee of the user corresponding to the TNI.

The embodiment of the present invention provides a PPPoE message transmission device, the device includes:

The receiving module is used to receive the Ethernet-based point-to-point communication protocol PPPoE message;

A processing module, configured to encapsulate the PPPoE packet into the NVGRE tunnel packet if the length of the PPPoE packet is less than or equal to a preset packet threshold; the NVGRE tunnel packet includes the NVGRE tunnel packet The destination IP address and the tenant network identifier TNI, the TNI corresponds to an NVGRE tunnel; and is used to determine the NVGRE tunnel corresponding to the TNI, and send the NVGRE tunnel message to The second network device corresponding to the destination IP address.

Optionally, the processing module is also used for:

If the length of the PPPoE message is greater than the preset message threshold, divide the PPPoE message into N PPPoE sub-messages, and encapsulate each of the PPPoE sub-messages into the NVGRE tunnel message text; wherein, the length of each PPPoE sub-message is less than or equal to the preset message threshold; N is an integer greater than 1.

Optionally, the device includes:

If the device is a network virtualization edge NVE device, the second network device is a PPPoE server cluster; if the device is the PPPoE server cluster, the second network device is the NVE device.

Optionally, the NVGRE tunnel message also includes an outer Ethernet header and an inner Ethernet header; the outer Ethernet header includes the source physical address of the PPPoE message and the destination physical address of the PPPoE message. address; the memory Ethernet header includes the source physical address of the NVGRE tunnel message and the destination physical address of the NVGRE tunnel message.

The embodiment of the present invention provides a PPPoE message transmission device, the device includes:

The receiving module is configured to receive a network virtualized NVGRE tunnel message encapsulated by a general route and sent by a first network device through an NVGRE tunnel; the NVGRE tunnel message includes a destination IP address and a tenant network identifier of the NVGRE tunnel message symbol TNI; the NVGRE tunnel corresponds to the TNI;

A processing module, configured to decapsulate the NVGRE tunnel message into a PPPoE message, and determine the length of the PPPoE message; and if the destination IP address is different from the IP address of the second network device , or the length of the PPPoE packet is greater than the preset packet threshold, the NVGRE tunnel packet is discarded.

Optionally, the processing module is also used for:

Obtain the TNI from the NVGRE tunnel message, and determine the bandwidth fee of the user corresponding to the TNI.

In the embodiment of the present invention, after the first network device encapsulates the PPPoE message through the NVGRE tunnel information, the NVGRE tunnel message encapsulated by the PPPoE message can be sent to the second network device belonging to the three-layer network through the NVGRE tunnel, It realizes the transmission of PPPoE packets between a layer-1 network device or a layer-2 network device and a layer-3 network device.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the embodiments of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a network topology diagram corresponding to a PPPoE packet transmission method proposed by an embodiment of the present invention.

FIG. 2 is a flow chart of steps corresponding to a PPPoE packet transmission method proposed by an embodiment of the present invention.

FIG. 3 is a PPPoE packet encapsulation format corresponding to a PPPoE packet transmission method proposed by an embodiment of the present invention.

FIG. 4 is a sequence diagram corresponding to a PPPoE packet transmission method proposed by an embodiment of the present invention.

FIG. 5 is a flow chart of steps corresponding to a PPPoE packet transmission method proposed by an embodiment of the present invention.

FIG. 6 is a sequence diagram corresponding to a PPPoE packet transmission method proposed by an embodiment of the present invention.

FIG. 7 is a schematic structural diagram corresponding to a PPPoE packet transmission device proposed by an embodiment of the present invention.

FIG. 8 is a schematic structural diagram corresponding to a PPPoE packet transmission device proposed by an embodiment of the present invention.

detailed description

In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application. To illustrate, rather than limit, the technical solutions of the present application, the embodiments of the present application and the technical features in the embodiments can be combined without conflict.

The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

The Ethernet-based point-to-point communication protocol (Point to Point Protocol over Ethernet, PPPoE) is a protocol for transmitting data on the Ethernet according to the point-to-point protocol, and the protocol can provide good access control and billing functions. This protocol can be used to connect to multiple hosts on a remote site through the same access device, and dial-up to access the Internet. At the same time, the access device can provide access control and accounting functions. In addition, among many access technologies, the most economical way to connect multiple hosts to access devices is to connect via Ethernet, and Point to Point Protocol (PPP) can provide good access control and billing Features. Therefore, PPPoE is an economical, convenient and comprehensive dial-up Internet protocol.

However, the PPPoE protocol is a Layer 2 protocol, so it can only transmit packets based on the Layer 2 network, and cannot perform Layer 3 forwarding. Some network devices responsible for control, such as servers, can only be deployed on the Layer 2 network. The layer-2 network is the data link layer in the Open System Interconnection (OSI) model, and the layer-3 network is the network layer in the OSI model.

With the rise of Software Defined Networking (SDN) technology, centralized management and control has gradually become mainstream. SDN is a new type of network architecture and a way to realize network virtualization. Its core technology separates the control plane and data plane of network equipment, and the control functions are concentrated on one control plane. The data plane of SDN is only responsible for forwarding data. Through programming the control plane, network managers can define rules and policies for network forwarding, thus realizing flexible control of network traffic. Therefore, in the SDN scenario, some network devices that carry control functions, such as PPPoE servers, need to be changed from the original Layer 2 network deployment to a Layer 3 network cluster deployment. However, the PPPoE protocol belongs to the two-layer protocol and does not support three-layer forwarding. Under the existing technology, between a layer-1 network device and a layer-3 network device, such as between a client in a layer-1 network and a PPPoE server in a layer-3 network , PPPoE packets cannot be transmitted.

Therefore, in the prior art, in an SDN scenario, it is an urgent problem to be solved that PPPoE packets cannot be transmitted between layer 1 and layer 2 network devices and layer 3 network devices. The embodiment of the present invention proposes a PPPoE packet transmission method based on Network Virtualization using Generic Routing Encapsulation (NVGRE). Among them, NVGRE is a technology for creating multiple independent virtual Layer 2 networks. NVGRE adopts the strategy of general routing encapsulation to create a large number of virtual local area network (Virtual Local Area Network, VLAN) VLAN subnets. A multi-tenant network with shared load balancing in the network. NVGRE uses Generic Routing Encapsulation (GRE) to create an independent virtual Layer 2 network, limiting the physical Layer 2 network or extending beyond subnet boundaries. NVGRE solves the multi-tenancy network problem through Tenancy Network Identifier (TNI), each TNI corresponds to a GRE channel one-to-one. It should be noted that the embodiment of the present invention only uses NVGRE as an example to transmit PPPoE packets.

FIG. 1 is a network topology diagram corresponding to a PPPoE packet transmission method proposed by an embodiment of the present invention. The embodiment of the present invention only takes the scene in Fig. 1 as an example to illustrate the transmission of PPPoE packets between a layer-1 network device PPPoE client and a layer-3 network device PPPoE server cluster, but is not limited to PPPoE packets between other network devices transmission.

The network topology structure includes: a PPPoE client, a Network Virtualization Edge (NVE) device, a router, an NVGRE tunnel, and a PPPoE server cluster.

PPPoE client: A computer connected to the PPPoE server cluster through PPPoE, using the files, printers and other resources shared by the PPPoE server cluster.

NVE device: the edge device of NVGRE. NVGRE-related processing is performed on the NVE, such as identifying the NVGRE network to which the Ethernet data frame belongs, performing Layer 2 forwarding of the data frame based on NVGRE, encapsulating/decapsulating the message, and so on. The NVE can be the server where the virtual machine resides, or an independent physical device.

Router: A router is a device connected to various LANs and WANs in the Internet. It will automatically select and set routes according to channel conditions, and send signals in the order of the best path.

NVGRE tunnel: NVGRE tunnel is a kind of tunnel technology, which is a way to transfer data between networks by using the infrastructure of the Internet. The data (or payload) transmitted through the tunnel may be data frames or packets of different protocols. The tunneling protocol repackages data frames or packets of other protocols and sends them through the tunnel. The new frame header provides routing information for passing the encapsulated payload data across the Internet. In the scenario shown in Figure 1, the tunnel protocol is the NVGRE protocol. The PPPoE client is connected to the NVE device, and uses the NVGRE protocol to encapsulate the PPPoE message. Through the NVGRE tunnel, the router in the three-layer network forwards the PPPoE message to the PPPoE server cluster.

PPPoE server cluster: A collection of multiple servers running PPPoE services. Physically, there are multiple servers. From the perspective of the client, there is only one server logically. The PPPoE server cluster can use multiple computers for parallel computing to obtain high computing speed, and can also use multiple computers for backup, so that the entire system can still operate normally if any one machine is broken.

The specific transmission process is shown in FIG. 2 , which is a flow chart of steps corresponding to a PPPoE packet transmission method proposed by the embodiment of the present invention. FIG. 2 is a flow chart of the steps for a layer-1 or layer-2 network device to send a PPPoE packet to a layer-3 network device.

Step 201: the first network device receives a PPPoE packet based on Ethernet.

Step 202: If the length of the PPPoE packet is less than or equal to a preset packet threshold, the first network device encapsulates the PPPoE packet into the NVGRE tunnel packet.

The NVGRE tunnel packet includes a destination IP address of the NVGRE tunnel packet and a tenant network identifier TNI, where the TNI corresponds to one NVGRE tunnel.

Step 203: The first network device determines the NVGRE tunnel corresponding to the TNI, and sends the NVGRE tunnel packet to the second network device corresponding to the destination IP address through the NVGRE tunnel.

In step 201, the first network device receives an Ethernet-based point-to-point communication protocol PPPoE message.

In step 202, the first network device encapsulates the PPPoE packet into an NVGRE tunnel packet according to the NVGRE tunnel information. Optionally, the first network device is an NVE device. NVGRE tunnel information includes the outer Ethernet header, outer IP address, GRE header, and inner Ethernet header.

The specific content of the NVGRE tunnel message, as shown in FIG. 3 , is a PPPoE message encapsulation format corresponding to a PPPoE message transmission method proposed by the embodiment of the present invention. The NVGRE tunnel packets encapsulated in PPPoE packets include but are not limited to: outer Ethernet header, outer IP address, GRE header, inner Ethernet header, and PPPoE data. Wherein, the PPPoE data is the original PPPoE message, and the GRE header includes at least a flag bit, TNI, and protocol type.

A feasible implementation manner is: 1. Add a GRE header before the inner Ethernet header, and write TNI into the VSID field in the GRE header. 2. Add the outer layer Internet Protocol (Internet Protocol, IP) address before the GRE header. The outer layer IP address includes the outer layer IP source address and the outer layer IP destination address. The outer layer IP source address is the IP address of the local NVE. The layer IP destination address provides an accessible IP address for the PPPoE server cluster. 3. Add an outer Ethernet header. The outer Ethernet header includes a source physical address and a destination physical address. The source physical address is the physical address of the NVE, and the destination physical address is the next-hop physical address. After the PPPoE packets are converted into Layer 3 NVGRE tunnel packets, they can be forwarded by Layer 3 network devices and reach the PPPoE server cluster.

Optionally, if the length of the PPPoE message is greater than the preset message threshold, the first network device divides the PPPoE message into N PPPoE sub-messages, and divides each of the PPPoE The sub-messages are encapsulated into the NVGRE tunnel message; wherein, the length of each PPPoE sub-message is less than or equal to the preset message threshold; N is an integer greater than 1.

In step 202, the TNI is used to determine the NVGRE tunnel corresponding to the TNI. After the NVGRE tunnel message is encapsulated, the first network device sends the NVGRE tunnel message to the second network device through the NVGRE tunnel determined by the TNI.

In step 203, optionally, the first network device will receive a response message of the NVGRE tunnel message in order to determine that the PPPoE server cluster has received the NVGRE tunnel message and realize data interaction with the PPPoE server cluster.

In the above steps 201 to 203, if the first network device is a network virtualization edge NVE device, the second network device is a PPPoE server cluster; if the first network device is the PPPoE server cluster, the The second network device is the NVE device.

As shown in FIG. 4 , it is a sequence diagram corresponding to a PPPoE packet transmission method proposed by the embodiment of the present invention. This sequence diagram describes the process of sending PPPoE packets and messages from the first-layer network device to the third-layer network device. The network devices involved in FIG. 4 include: PPPoE client, NVE, router, and PPPoE server cluster. The specific timing process is:

401: The PPPoE client sends a PPPoE dial-up packet to the NVE.

402: The NVE encapsulates the NVGRE tunnel packet.

403: The NVE sends the NVGRE tunnel packet to the router.

Wherein, the router is a layer 3 network device.

404: The router forwards the NVGRE tunnel packet to the PPoE server cluster.

405: The PPoE server cluster decapsulates the NVGRE tunnel packet.

406: The PPoE server cluster extracts the TNI in the NVGRE tunnel packet.

407: The PPoE server cluster extracts the PPPoE information in the NVGRE tunnel packet.

408: The PPoE server cluster determines the NVGRE tunnel of the NVGRE tunnel packet.

The above 405-408 are a series of specific processing steps after the PPPoE server cluster receives the NVGRE tunnel message, which will be described in detail in conjunction with Figure 5. As shown in Figure 5, it is a PPPoE message proposed by the embodiment of the present invention Flowchart of steps corresponding to the transfer method.

Step 501: The second network device receives the network virtualization NVGRE tunnel packet encapsulated by the general route sent by the first network device through the NVGRE tunnel.

The NVGRE tunnel packet includes a destination IP address of the NVGRE tunnel packet and a tenant network identifier TNI; the NVGRE tunnel corresponds to the TNI.

Step 502: The second network device decapsulates the NVGRE tunnel packet into a PPPoE packet, and determines the length of the PPPoE packet.

Step 503: If the destination IP address is different from the IP address of the second network device, or the length of the PPPoE packet is greater than a preset packet threshold; then the second network device reports the NVGRE tunnel The text is discarded.

In step 501, the second network device receives an NVGRE tunnel packet. The NVGRE tunnel message includes an Ethernet-based point-to-point communication protocol PPPoE message, a tenant network identifier TNI; the TNI is used to determine the NVGRE tunnel corresponding to the TNI; the first network device is a layer of network equipment Or a Layer 2 network device; the second network device is a Layer 3 network device.

After the PPPoE server cluster obtains the PPPoE message, the overall process from generating the PPPoE response message to the NVE sending the PPPoE response message to the PPPoE client will be described in detail in conjunction with Figure 6, as shown in Figure 6, which is an embodiment of the present invention A timing diagram corresponding to a proposed PPPoE packet transmission method.

601: The PPPoE server cluster generates a PPPoE response packet.

602: The PPPoE server cluster searches for the TNI.

603: The PPPoE server cluster encapsulates the PPPoE response packet into a response packet of the NVGRE tunnel packet according to the TNI.

604: The PPPoE server cluster sends the response packet of the NVGRE tunnel packet to the router.

605: The router forwards the response message of the NVGRE tunnel message to the NVE.

606: The NVE decapsulates the response message of the NVGRE tunnel message.

607: The NVE sends a PPPoE response packet to the PPPoE client.

In the embodiment of the present invention, after the first network device encapsulates the PPPoE message through the NVGRE tunnel information, the NVGRE tunnel message encapsulated by the PPPoE message can be sent to the second network device belonging to the three-layer network through the NVGRE tunnel, It realizes the transmission of PPPoE packets between a layer-1 network device or a layer-2 network device and a layer-3 network device.

As shown in Figure 7, it is a schematic structural diagram of a PPPoE packet transmission device provided by the embodiment of the present invention, the device includes:

A receiving module 701, configured to receive Ethernet-based point-to-point communication protocol PPPoE packets;

A processing module 702, configured to encapsulate the PPPoE packet into the NVGRE tunnel packet if the length of the PPPoE packet is less than or equal to a preset packet threshold; the NVGRE tunnel packet includes the NVGRE tunnel packet The destination IP address of the text and the tenant network identifier TNI, the TNI corresponds to an NVGRE tunnel; and is used to determine the NVGRE tunnel corresponding to the TNI, and send the NVGRE tunnel message through the NVGRE tunnel to the second network device corresponding to the destination IP address.

Optionally, the processing module 702 is further configured to:

If the length of the PPPoE message is greater than the preset message threshold, divide the PPPoE message into N PPPoE sub-messages, and encapsulate each of the PPPoE sub-messages into the NVGRE tunnel message text; wherein, the length of each PPPoE sub-message is less than or equal to the preset message threshold; N is an integer greater than 1.

Optionally, the device includes:

If the device is a network virtualization edge NVE device, the second network device is a PPPoE server cluster; if the device is the PPPoE server cluster, the second network device is the NVE device.

Optionally, the NVGRE tunnel message also includes an outer Ethernet header and an inner Ethernet header; the outer Ethernet header includes the source physical address of the PPPoE message and the destination physical address of the PPPoE message. address; the memory Ethernet header includes the source physical address of the NVGRE tunnel message and the destination physical address of the NVGRE tunnel message.

As shown in FIG. 8, it is a schematic structural diagram corresponding to a PPPoE message transmission device proposed in the embodiment of the present invention, and the device includes:

The receiving module 801 is configured to receive a network virtualized NVGRE tunnel message encapsulated by a general route and sent by a first network device through an NVGRE tunnel; the NVGRE tunnel message includes a destination IP address of the NVGRE tunnel message and a tenant network Identifier TNI; the NVGRE tunnel corresponds to the TNI;

A processing module 802, configured to decapsulate the NVGRE tunnel packet into a PPPoE packet, and determine the length of the PPPoE packet; and if the destination IP address is different from the IP address of the second network device or the length of the PPPoE packet is greater than the preset packet threshold, the NVGRE tunnel packet is discarded.

Optionally, the processing module 802 is further configured to:

Obtain the TNI from the NVGRE tunnel message, and determine the bandwidth fee of the user corresponding to the TNI.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

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 should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

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

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (6)

1. A PPPoE dialing message transmission method is characterized by comprising the following steps:

a first network device receives a point-to-point communication protocol PPPoE message based on Ethernet;

if the length of the PPPoE message is smaller than or equal to a preset message threshold value, the first network equipment encapsulates the PPPoE message into an NVGRE tunnel message; the NVGRE tunnel message includes a destination IP address of the NVGRE tunnel message and a tenant network identifier TNI, where the TNI corresponds to one NVGRE tunnel, and the NVGRE tunnel message further includes an outer ethernet header and an inner ethernet header; the inner layer Ethernet head comprises a source physical address of the PPPoE message and a destination physical address of the PPPoE message; the outer Ethernet header comprises a source physical address of the NVGRE tunnel message and a destination physical address of the NVGRE tunnel message;

the first network device determines the NVGRE tunnel corresponding to the TNI, and sends the NVGRE tunnel message to a second network device corresponding to the destination IP address through the NVGRE tunnel;

if the length of the PPPoE message is greater than the preset message threshold, the first network device divides the PPPoE message into N PPPoE sub-messages, and encapsulates each PPPoE sub-message into the NVGRE tunnel message; wherein the length of each PPPoE sub-message is less than or equal to the preset message threshold; n is an integer greater than 1.

2. The method of claim 1, comprising:

if the first network device is a network virtualization edge NVE device, the second network device is a PPPoE server cluster; and if the first network equipment is the PPPoE server cluster, the second network equipment is the NVE equipment.

3. A method for packet transmission, comprising:

the second network equipment receives a network virtualization NVGRE tunnel message which is sent by the first network equipment and packaged by using a general route through the NVGRE tunnel; the NVGRE tunnel message comprises a destination IP address of the NVGRE tunnel message and a tenant network identifier TNI; the NVGRE tunnel corresponds to the TNI, and the NVGRE tunnel message further comprises an outer-layer Ethernet header and an inner-layer Ethernet header; the inner layer Ethernet head comprises a source physical address of the PPPoE message and a destination physical address of the PPPoE message; the outer Ethernet header comprises a source physical address of the NVGRE tunnel message and a destination physical address of the NVGRE tunnel message;

the second network equipment decapsulates the NVGRE tunnel message into a PPPoE message and determines the length of the PPPoE message;

if the destination IP address is different from the IP address of the second network device, or the length of the PPPoE message is greater than a preset message threshold value, the second network device discards the NVGRE tunnel message;

and the second network equipment acquires the TNI from the NVGRE tunnel message and determines the bandwidth cost of the user corresponding to the TNI.

4. A PPPoE dialing message transmission device is characterized by comprising:

the receiving module is used for receiving a point-to-point communication protocol PPPoE message based on the Ethernet;

the processing module is used for packaging the PPPoE message into an NVGRE tunnel message if the length of the PPPoE message is smaller than or equal to a preset message threshold value; the NVGRE tunnel message includes a destination IP address of the NVGRE tunnel message and a tenant network identifier TNI, where the TNI corresponds to one NVGRE tunnel, and the NVGRE tunnel message further includes an outer ethernet header and an inner ethernet header; the inner layer Ethernet head comprises a source physical address of the PPPoE message and a destination physical address of the PPPoE message; the outer Ethernet header comprises a source physical address of the NVGRE tunnel message and a destination physical address of the NVGRE tunnel message; the NVGRE tunnel corresponding to the TNI is determined, and the NVGRE tunnel message is sent to the second network equipment corresponding to the destination IP address through the NVGRE tunnel;

the network node is further configured to, if the length of the PPPoE message is greater than the preset message threshold, divide the PPPoE message into N PPPoE sub-messages, and encapsulate each PPPoE sub-message into the NVGRE tunnel message; the length of each PPPoE sub-message is smaller than or equal to the preset message threshold value; n is an integer greater than 1.

5. The apparatus of claim 4, comprising:

if the device is a network virtualization edge NVE device, the second network device is a PPPoE server cluster; and if the device is the PPPoE server cluster, the second network equipment is the NVE equipment.

6. A message transmission apparatus, comprising:

the receiving module is used for receiving a Network Virtualization (NVGRE) tunnel message which is sent by the first network equipment and is encapsulated by the general routing through the NVGRE tunnel; the NVGRE tunnel message comprises a destination IP address of the NVGRE tunnel message and a Tenant Network Identifier (TNI); the NVGRE tunnel corresponds to the TNI, and the NVGRE tunnel message further comprises an outer-layer Ethernet header and an inner-layer Ethernet header; the inner layer Ethernet head comprises a source physical address of the PPPoE message and a destination physical address of the PPPoE message; the outer Ethernet header comprises a source physical address of the NVGRE tunnel message and a destination physical address of the NVGRE tunnel message;

the processing module is used for decapsulating the NVGRE tunnel message into a PPPoE message and determining the length of the PPPoE message; and the NVGRE tunnel message is discarded if the destination IP address is different from the IP address of the second network device or the length of the PPPoE message is greater than a preset message threshold;

and the network side is further configured to acquire the TNI from the NVGRE tunnel packet, and determine a bandwidth cost of a user corresponding to the TNI.

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