CN111431787B - Tunnel establishment method and device and computer readable storage medium - Google Patents

Abstract

Embodiments of the present invention disclose a tunnel establishment method, a device and a computer-readable storage medium, which relate to the technical field of communications and are used to ensure the performance of a BRAS controller. The tunnel establishment method of the present invention includes: acquiring the information of the LNS; and establishing an L2TP tunnel with the LNS according to the information of the LNS. The embodiment of the present invention can ensure the performance of the BRAS controller.

Description

A tunnel establishment method, device and computer-readable storage medium

technical field

Embodiments of the present invention relate to the field of communications technologies, and in particular, to a tunnel establishment method, an apparatus, and a computer-readable storage medium.

Background technique

Broadband Remote Access Server (BRAS) is a new access gateway for broadband network applications. For BRAS equipment, the most important step to promote its generalization evolution is the separation of forwarding and control.

The basic idea of the vBRAS (virtual BRAS) system is to abstract the control plane functions on multiple BRAS devices and deploy them in a centralized cloud to form a unified BRAS controller (BRAS-CP). The BRAS device or other forwarding device forms a BRAS repeater (BRAS-UP). Then, the control separation vBRAS system consists of BRAS-CP and BRAS-UP.

In the vBRAS system with separation of transfer and control, the tunnel and session endpoint of the Layer 2 Tunneling Protocol (L2TP) service are established on the BRAS-CP. Because L2TP is a high-traffic service scenario, all L2TP user traffic needs to be detoured to BRAS-CP. Therefore, L2TP user traffic is seriously detoured, and the massive user traffic has caused great performance pressure on BRAS-CP.

SUMMARY OF THE INVENTION

In view of this, embodiments of the present invention provide a tunnel establishment method, an apparatus, and a computer-readable storage medium, so as to ensure the performance of the BRAS controller.

In order to solve the above technical problems, in a first aspect, an embodiment of the present invention provides a method for establishing a tunnel, which is applied to a LAC (L2TP Access Concentrator, L2TP Access Concentrator), including:

Obtain the information of LNS (L2TP Network Server, L2TP network server);

According to the information of the LNS, establish an L2TP tunnel with the LNS;

Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

Wherein, establishing an L2TP tunnel with the LNS according to the information of the LNS includes:

According to the information of the LNS, send a tunnel connection request to the LNS; the tunnel connection request includes the first transfer control separation identifier and the information of the LAC side BRAS forwarder;

receiving a tunnel connection response sent by the LNS;

According to the tunnel connection response, an L2TP tunnel between the LAC-side BRAS forwarder and the LNS-side BRAS device is established.

Wherein, establishing an L2TP tunnel with the LNS according to the information of the LNS includes:

According to the information of the LNS, send a tunnel connection request to the LNS;

Receive the tunnel connection response sent by the LNS, and the tunnel connection response includes the second transfer control separation identifier and the information of the LNS-side BRAS forwarder;

According to the tunnel connection response, an L2TP tunnel between the BRAS device on the LAC side and the BRAS forwarder on the LNS side is established.

Wherein, the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater at the LAC end;

The establishment of the L2TP tunnel between the BRAS device on the LAC side and the BRAS repeater on the LNS side is specifically:

An L2TP tunnel between the LAC-side BRAS repeater and the LNS-side BRAS repeater is established.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

In a second aspect, an embodiment of the present invention provides a method for establishing a tunnel, which is applied to an LNS, including:

According to the request of the LAC, establish an L2TP tunnel with the LAC;

Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

Wherein, according to the request of the LAC, establishing an L2TP tunnel with the LAC includes:

Receive the tunnel connection request of the LAC end; the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater of the LAC end;

sending a tunnel connection response to the LAC end;

An L2TP tunnel is established between the LNS-side BRAS device and the LAC-side BRAS repeater.

Wherein, according to the request of the LAC, establishing an L2TP tunnel with the LAC includes:

receiving a tunnel connection request from the LAC side;

sending a tunnel connection response to the LAC end, where the tunnel connection response includes the second switching control separation identifier and the information of the BRAS repeater at the LNS side;

An L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device is established.

Wherein, the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater at the LAC end;

The establishing the L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device includes:

An L2TP tunnel between the LNS-side BRAS repeater and the LAC-side BRAS repeater is established.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

In a third aspect, an embodiment of the present invention provides a tunnel establishment apparatus, which is applied to a LAC and includes: a processor and a transceiver;

the processor, configured to acquire the information of the L2TP network server LNS; establish an L2TP tunnel with the LNS according to the information of the LNS;

Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

Wherein, the processor is also used for:

According to the information of the LNS, send a tunnel connection request to the LNS; the tunnel connection request includes the first transfer control separation identifier and the information of the LAC side BRAS forwarder;

receiving a tunnel connection response sent by the LNS;

According to the tunnel connection response, an L2TP tunnel between the LAC-side BRAS forwarder and the LNS-side BRAS device is established.

Wherein, the processor is also used for:

According to the information of the LNS, send a tunnel connection request to the LNS;

Receive the tunnel connection response sent by the LNS, and the tunnel connection response includes the second transfer control separation identifier and the information of the LNS-side BRAS forwarder;

According to the tunnel connection response, an L2TP tunnel between the BRAS device on the LAC side and the BRAS forwarder on the LNS side is established.

Wherein, the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater at the LAC end;

The processor is further configured to: establish an L2TP tunnel between the LAC-side BRAS repeater and the LNS-side BRAS repeater.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

In a fourth aspect, an embodiment of the present invention further provides a tunnel establishment apparatus, applied to an LNS, including: a processor and a transceiver;

the processor, configured to establish an L2TP tunnel with the LAC according to the request of the LAC;

Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

Wherein, the processor is also used for:

Receive the tunnel connection request of the LAC end; the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater of the LAC end;

sending a tunnel connection response to the LAC end;

An L2TP tunnel is established between the LNS-side BRAS device and the LAC-side BRAS repeater.

Wherein, the processor is also used for:

receiving a tunnel connection request from the LAC side;

sending a tunnel connection response to the LAC end, where the tunnel connection response includes the second switching control separation identifier and the information of the BRAS repeater at the LNS side;

An L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device is established.

Wherein, the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater at the LAC end;

The processor is further configured to establish an L2TP tunnel between the LNS-side BRAS repeater and the LAC-side BRAS repeater.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third bit is a third preset value When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

In a fifth aspect, an embodiment of the present invention further provides a communication device, including: a transceiver, a memory, a processor, and a computer program stored in the memory and running on the processor; the processor, using The program in the read memory implements the steps in the method described in the first aspect; or realizes the steps in the method described in the second aspect.

In a sixth aspect, an embodiment of the present invention further provides a computer-readable storage medium for storing a computer program, and when the computer program is executed by a processor, the steps in the method described in the first aspect are implemented; The steps in the method described in the second aspect.

The beneficial effects of the above-mentioned technical solutions of the embodiments of the present invention are as follows:

In the embodiment of the present invention, in the vBRAS system with separation of forwarding and control, one endpoint or two endpoints of the established L2TP tunnel are on the BRAS forwarder. Therefore, using the solution of the embodiment of the present invention can reduce the data processing of the BRAS controller quantity, thus ensuring the performance of the BRAS transponder.

Description of drawings

1 is a flowchart of a method for establishing a tunnel according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an L2TP packet header;

Fig. 3 is the schematic diagram of AVP;

4 is a flowchart of a method for establishing a tunnel according to an embodiment of the present invention;

5 is a flowchart of a method for establishing a tunnel according to an embodiment of the present invention;

6 is a schematic diagram of a tunnel establishment apparatus according to an embodiment of the present invention;

7 is a schematic diagram of a tunnel establishment apparatus according to an embodiment of the present invention;

8 is a schematic diagram of a communication device according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a communication device according to an embodiment of the present invention.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

As shown in FIG. 1 , a tunnel establishment method according to an embodiment of the present invention, applied to a LAC, includes:

Step 101: Obtain the information of the L2TP network server LNS.

Wherein, the information of the LNS includes but is not limited to the name and address of the LNS. In a specific application, when a user initiates a network access, the Radius (Remote Authentication Dial In User Service) server authenticates the user, and returns the corresponding LNS address (LNS CP (Control Plane, Control Plane) of the user if the authentication is passed. face)) and other related information, and the LAC is ready to initiate a tunnel connection request.

Step 102: Establish an L2TP tunnel with the LNS according to the information of the LNS.

Wherein, one endpoint of the L2TP tunnel is the broadband remote access server BRAS repeater of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or one endpoint of the L2TP tunnel is the BRAS device of the LAC side, so The other end point of the L2TP tunnel is a BRAS repeater at the LNS end; or, one end point of the L2TP tunnel is a BRAS repeater at the LAC end, and the other end point of the L2TP tunnel is a BRAS repeater at the LNS end.

That is to say, in this embodiment of the present invention, both the LAC and the LNS end may be the vBRAS system separated by transcoding, or only one end may be the vBRAS system separated by transcoding. Then, when one of the ends is a vBRAS system with a transfer control separation, the established L2TP channel is the tunnel to its BRAS forwarder.

When the LAC side or the LNS side is a vBRAS system with control separation, its BRAS device includes a BRAS repeater and a BRAS controller, then the L2TP tunnel established in this embodiment of the present invention is a tunnel to the BRAS repeater. Otherwise, since the forwarding and control separation of the BRAS device is not performed, the BRAS device is still a traditional BRAS device, and the established L2TP tunnel is a tunnel to the BRAS device.

Currently, the L2TP packet header does not contain the device type identifier, and the packet header needs to be expanded in this embodiment of the present invention.

As shown in Figure 2, the meanings of each byte in the L2TP packet header are as follows:

T: message type, "0" means data message, "1" means control message;

L: Length in-bit flag, "1" indicates that there is a length field in the packet header;

Tunnel ID: Tunnel identifier; Session ID: Session identifier.

In the embodiment of the present invention, the third bit of the extended definition is the device identifier Dt, which is used to indicate whether the local end is a transfer control separation vBRAS system. For example, "1" indicates that the transfer control split vBRAS system, "0" indicates the traditional BRAS.

In the L2TP protocol, control messages are used for the establishment, maintenance, and teardown of user tunnels and session connections, as well as transmission control, and parameters in the control messages are represented by attribute value pairs (Attribute Value Pair, AVP). In the prior art, the AVP of the control message does not carry the information of the tunnel endpoint after the replacement. In the embodiment of the present invention, it is extended to carry the information of the tunnel endpoint after the change, that is, the information of the BRAS forwarder.

As shown in Figure 3, it is a schematic diagram of AVP. Common Attribute Types are as follows:

Attribute Type=0: Message Type AVP, which identifies the control message;

Attribute Type=2: Protocol Version AVP, which identifies the L2TP protocol version;

Attribute Type=7: Host Name AVP, which identifies the host name of the sender;

Attribute Type=11: Challenge, indicating that the sender wishes to perform challenge handshake authentication protocol (Challenge Handshake Authentication Protocol, CHAP) verification on the peer end of the tunnel (Tunnel).

In this embodiment of the present invention, Attribute Type=fifth preset value: BRAS-UP Name AVP, where BRAS-UPName represents the host name of the local BRAS forwarder.

The fifth preset value may be 255. That is, in this embodiment, the extended attribute value is:

Attribute Type=255: BRAS-UP Name AVP, which identifies the host name of the local BRAS forwarder.

In the following, descriptions will be made separately in conjunction with whether the LAC side and the LNS side are trans-control separation vBRAS systems.

(1) Only the LAC side is the transfer control separation vBRAS system:

In this step, the LAC sends a tunnel connection request to the LNS according to the information of the LNS, and the tunnel connection request includes the first switching control separation identifier and the information of the BRAS forwarder on the LAC side. Then, the LAC receives the tunnel connection response sent by the LNS, and establishes an L2TP tunnel between the BRAS forwarder at the LAC side and the BRAS device at the LNS side according to the tunnel connection response.

The first transfer control separation identifier is the device identifier. When the third bit is the first preset value, it indicates that the LAC end is a trans-control separation vBRAS system; when the third bit is the second preset value, it indicates that the LAC end is not the trans-control separation vBRAS system. For example, "1" indicates that the transfer control separation vBRAS system, "0" indicates that the transfer control separation vBRAS system is not, that is, the traditional BRAS.

(2) Only the LNS side is the transfer control separation vBRAS system:

In this step, the LAC sends a tunnel connection request to the LNS according to the information of the LNS, and then receives a tunnel connection response sent by the LNS. The tunnel connection response includes the second forwarding control separation identifier and the BRAS forwarding on the LNS side. device information. Finally, according to the tunnel connection response, an L2TP tunnel is established between the BRAS device on the LAC side and the BRAS forwarder on the LNS side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response, that is, the device identifier. When the third bit is the third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third bit is the fourth preset value, it indicates that the LNS end is not the transfer control separation vBRAS system. For example, "1" indicates that the transfer control separation vBRAS system, "0" indicates that the transfer control separation vBRAS system is not, that is, the traditional BRAS.

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=255: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

(3) Both the LAC side and the LNS side are control-separated vBRAS systems:

In this step, the LAC sends a tunnel connection request to the LNS according to the information of the LNS, and the tunnel connection request includes the first switching control separation identifier and the information of the BRAS forwarder on the LAC side. Then, the tunnel connection response sent by the LNS is received, and the tunnel connection response includes the second switching control separation identifier and the information of the BRAS forwarder on the LNS side. Finally, according to the tunnel connection response, an L2TP tunnel is established between the BRAS repeater at the LAC end and the BRAS repeater at the LNS end.

For the meanings of the first switching control separation identifier and the second switching control separation identifier, reference may be made to the foregoing description.

In the embodiment of the present invention, in the vBRAS system with separation of forwarding and control, one endpoint or two endpoints of the established L2TP tunnel are on the BRAS forwarder. Therefore, using the solution of the embodiment of the present invention can reduce the data processing of the BRAS controller quantity, thus ensuring the performance of the BRAS transponder.

As shown in FIG. 4 , the tunnel establishment method according to the embodiment of the present invention includes:

Step 401, according to the request of the LAC, establish an L2TP tunnel with the LAC;

Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

In the following, descriptions will be made separately in conjunction with whether the LAC side and the LNS side are trans-control separation vBRAS systems.

(1) Only the LAC side is the transfer control separation vBRAS system:

In this step, the LNS receives the tunnel connection request from the LAC side; the tunnel connection request includes the first switching control separation identifier and the information of the BRAS forwarder on the LAC side, and then sends a tunnel connection response to the LAC side. Finally, an L2TP tunnel between the LNS-side BRAS device and the LAC-side BRAS repeater is established.

(2) Only the LNS side is the transfer control separation vBRAS system:

In this step, the LNS receives the tunnel connection request from the LAC side. Then, a tunnel connection response is sent to the LAC side, and the tunnel connection response includes the second switching control separation identifier and the information of the BRAS forwarder at the LNS side. Finally, an L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device is established.

(3) Both the LAC side and the LNS side are control-separated vBRAS systems:

In this step, in this step, the LNS receives the tunnel connection request from the LAC side, and the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater on the LAC side. Then, a tunnel connection response is sent to the LAC side, and the tunnel connection response includes the second switching control separation identifier and the information of the BRAS forwarder at the LNS side. Finally, an L2TP tunnel between the LNS-side BRAS repeater and the LAC-side BRAS repeater is established.

For the meanings of the first switching control separation identifier and the second switching control separation identifier, reference may be made to the foregoing description.

In the embodiment of the present invention, in the vBRAS system with separation of forwarding and control, one endpoint or two endpoints of the established L2TP tunnel are on the BRAS forwarder. Therefore, using the solution of the embodiment of the present invention can reduce the data processing of the BRAS controller quantity, thus ensuring the performance of the BRAS transponder.

As shown in FIG. 5 , the data processing method according to the embodiment of the present invention includes:

Step 501 : CU channels are respectively established between the LAC UP (User Plane, user plane) and the LAC CP and between the LNS UP and the LNS CP.

Step 502: The user initiates a call connection (not shown in the figure).

Step 503: The home gateway (Residential Gateway, RG) and the LAC end conduct PPP (Point to Point Protocol, point-to-point) LCP (Link Control Protocol, Link Control Protocol) negotiation, and the LAC UP transmits the PPP control message through the VXLAN (Virtual Extensible Protocol). LAN, Extensible Virtual Local Area Network) tunnel is sent to the PPP component on the LAC CP for processing.

Step 504: The LAC CP performs CHAP (Challenge Handshake Authentication Protocol, Challenge Handshake Authentication Protocol) authentication on the user information provided by the home gateway.

Step 505: The LAC CP sends the authentication information (username, password) to the Radius server for authentication.

Step 506 : the Radius server authenticates the user, and returns relevant information such as the LNS address (LNS CP) corresponding to the user if the authentication is passed, and the LAC prepares to initiate a Tunnel connection request.

Step 507: The LAC CP side initiates a Tunnel Connection Request (SCCRQ) to the LNS, and the SCCRQ needs to identify the information of the transfer control separation vBRAS system and the local BRAS-UP.

Currently, the L2TP packet header does not contain the device type identifier, and the current packet header needs to be expanded. As shown in Figure 2, the 3rd bit of the extended definition is the device identifier Dt, "1" represents the transfer control separation vBRAS, and "0" represents the traditional BRAS. The AVP of the current control message does not carry the information of the tunnel endpoint after the replacement, and needs to be expanded. As shown in Figure 3, in this embodiment the expansion is as follows:

Attribute Type=255: BRAS-UP Name AVP, which identifies the BRAS-UP host name of the local end.

Step 508: The LAC UP parses the L2TP control packet from the VXLAN tunnel, searches for a route, and forwards the control packet to the LNS.

Step 509 : the SCCRP message sent by the LNS CP to the LAC needs to carry the identification bit of the VBRAS system of the transfer control separation and the information of the LNS UP.

Step 510: The LAC sends an SCCCN message to the LNS, indicating that the tunnel is successfully established and the tunnel endpoint is established on the BRAS-UP.

Step 511: Establish a Session.

Step 512: The LAC CP transmits the user authentication information and PPP negotiation parameters to the LNS, and the LNS UP sends the L2TP control packet to the LNS component on the LNS CP through the VXLAN tunnel for processing.

Step 513: The LNS CP sends the access request information to the Radius server for authentication. The Radius server authenticates the request information, and returns the response information if the authentication is passed.

Step 514: The LNS assigns an IP address to the user.

The home gateway accesses the enterprise network through the L2TP tunnel.

It can be seen from the above that the embodiment of the present invention redesigns the L2TP access process based on the vBRAS architecture of the forwarding and control separation, and establishes the L2TP tunnel on the BRAS-UP by extending the L2TP protocol, which solves the problem of traffic detour and control plane BRAS-UP. CP performance pressure issues.

As shown in FIG. 6 , the tunnel establishment apparatus according to the embodiment of the present invention, applied to the LAC, includes: a processor 601 and a transceiver 602;

The processor 601 is configured to acquire the information of the L2TP network server LNS; according to the information of the LNS, establish an L2TP tunnel with the LNS;

Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

The processor 601 is further configured to: send a tunnel connection request to the LNS according to the information of the LNS; include the first transfer control separation identifier and the information of the BRAS forwarder at the LAC side in the tunnel connection request; The tunnel connection response sent by the LNS; according to the tunnel connection response, establish an L2TP tunnel between the BRAS forwarder on the LAC side and the BRAS device on the LNS side.

The processor 601 is further configured to: send a tunnel connection request to the LNS according to the information of the LNS; receive a tunnel connection response sent by the LNS, where the tunnel connection response includes a second transfer control separation identifier and Information of the BRAS forwarder at the LNS side; according to the tunnel connection response, establish an L2TP tunnel between the BRAS device at the LAC side and the BRAS forwarder at the LNS side.

Wherein, the tunnel connection request includes the first switching control separation identifier and the information of the BRAS repeater at the LAC end; the processor 601 is further configured to: establish a connection between the BRAS repeater at the LAC end and the BRAS repeater at the LNS end L2TP tunnel.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third bit is a third preset value When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

For the meanings of the first switching control separation identifier and the second switching control separation identifier, reference may be made to the foregoing description.

For the working principle of the device of the present invention, reference may be made to the description of the foregoing method embodiments.

In the embodiment of the present invention, in the vBRAS system with separation of forwarding and control, one endpoint or two endpoints of the established L2TP tunnel are on the BRAS forwarder. Therefore, using the solution of the embodiment of the present invention can reduce the data processing of the BRAS controller quantity, thus ensuring the performance of the BRAS transponder.

As shown in FIG. 7 , the tunnel establishment apparatus according to the embodiment of the present invention, applied to the LNS, includes: a processor 701 and a transceiver 702;

The processor 701 is configured to establish an L2TP tunnel with the LAC according to a request of the LAC;

Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

The processor 701 is further configured to: receive a tunnel connection request from the LAC side; include a first transfer control separation identifier and information of a BRAS repeater on the LAC side in the tunnel connection request; send the tunnel connection request to the LAC side Connection response; establish an L2TP tunnel between the LNS-side BRAS device and the LAC-side BRAS forwarder.

The processor 701 is further configured to: receive a tunnel connection request from the LAC side; send a tunnel connection response to the LAC side, where the tunnel connection response includes a second transfer control separation identifier and a BRAS repeater on the LNS side information; establish an L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device.

Wherein, the tunnel connection request includes the first switching control separation identifier and the information of the BRAS repeater at the LAC end; the processor 701 is further configured to establish a connection between the BRAS repeater at the LNS end and the BRAS repeater at the LAC end L2TP tunnel.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third bit is a third preset value When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

For the meanings of the first switching control separation identifier and the second switching control separation identifier, reference may be made to the foregoing description.

For the working principle of the device of the present invention, reference may be made to the description of the foregoing method embodiments.

In the embodiment of the present invention, in the vBRAS system with separation of forwarding and control, one endpoint or two endpoints of the established L2TP tunnel are on the BRAS forwarder. Therefore, using the solution of the embodiment of the present invention can reduce the data processing of the BRAS controller quantity, thus ensuring the performance of the BRAS transponder.

As shown in FIG. 8 , the communication device according to the embodiment of the present invention includes: a processor 800, configured to read a program in a memory 820, and perform the following processes:

Obtain the information of the L2TP network server LNS;

According to the information of the LNS, establish an L2TP tunnel with the LNS;

Wherein, one endpoint of the L2TP tunnel is the broadband remote access server BRAS repeater on the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device on the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

The transceiver 810 is used to receive and transmit data under the control of the processor 800 .

8, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 800 and various circuits of memory represented by memory 820 are linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein. The bus interface provides the interface. Transceiver 810 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other devices over a transmission medium. The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 in performing operations.

The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 in performing operations.

The processor 800 is also used to read the computer program, and perform the following steps:

According to the information of the LNS, send a tunnel connection request to the LNS; the tunnel connection request includes the first transfer control separation identifier and the information of the LAC side BRAS forwarder;

receiving a tunnel connection response sent by the LNS;

According to the tunnel connection response, an L2TP tunnel between the LAC-side BRAS forwarder and the LNS-side BRAS device is established.

The processor 800 is also used to read the computer program, and perform the following steps:

According to the information of the LNS, send a tunnel connection request to the LNS;

Receive the tunnel connection response sent by the LNS, and the tunnel connection response includes the second transfer control separation identifier and the information of the LNS-side BRAS forwarder;

According to the tunnel connection response, an L2TP tunnel between the BRAS device on the LAC side and the BRAS forwarder on the LNS side is established.

The tunnel connection request includes the information of the first transfer control separation identifier and the BRAS repeater at the LAC end; the processor 800 is also used to read the computer program, and execute the following steps:

An L2TP tunnel between the LAC-side BRAS repeater and the LNS-side BRAS repeater is established.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third bit is a third preset value When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

As shown in FIG. 9 , the communication device according to the embodiment of the present invention includes: a processor 900, configured to read a program in a memory 920, and execute the following processes:

According to the request of the LAC, establish an L2TP tunnel with the LAC;

Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

The transceiver 910 is used to receive and transmit data under the control of the processor 900 .

9, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 900 and various circuits of memory represented by memory 920 are linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein. The bus interface provides the interface. Transceiver 910 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other devices over a transmission medium. The processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 may store data used by the processor 900 in performing operations.

The processor 900 is responsible for managing the bus architecture and general processing, and the memory 920 may store data used by the processor 900 in performing operations.

The processor 900 is also used to read the computer program, and perform the following steps:

Receive the tunnel connection request of the LAC end; the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater of the LAC end;

sending a tunnel connection response to the LAC end;

An L2TP tunnel is established between the LNS-side BRAS device and the LAC-side BRAS repeater.

The processor 900 is also used to read the computer program, and perform the following steps:

receiving a tunnel connection request from the LAC side;

sending a tunnel connection response to the LAC end, where the tunnel connection response includes the second switching control separation identifier and the information of the BRAS repeater at the LNS side;

An L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device is established.

Wherein, in the described tunnel connection request, the information of the first transfer control separation identifier and the LAC end BRAS repeater is included; the processor 900 is also used to read the computer program, and execute the following steps:

An L2TP tunnel between the LNS-side BRAS repeater and the LAC-side BRAS repeater is established.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third bit is a third preset value When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

In addition, the computer-readable storage medium of the embodiment of the present invention is used to store a computer program, and the computer program can be executed by a processor to implement the following steps:

Obtain the information of the L2TP network server LNS;

According to the information of the LNS, establish an L2TP tunnel with the LNS;

Wherein, one endpoint of the L2TP tunnel is the broadband remote access server BRAS repeater on the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device on the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

Wherein, establishing an L2TP tunnel with the LNS according to the information of the LNS includes:

According to the information of the LNS, send a tunnel connection request to the LNS; the tunnel connection request includes the first transfer control separation identifier and the information of the LAC side BRAS forwarder;

receiving a tunnel connection response sent by the LNS;

According to the tunnel connection response, an L2TP tunnel between the LAC-side BRAS forwarder and the LNS-side BRAS device is established.

Wherein, establishing an L2TP tunnel with the LNS according to the information of the LNS includes:

According to the information of the LNS, send a tunnel connection request to the LNS;

Receive the tunnel connection response sent by the LNS, and the tunnel connection response includes the second transfer control separation identifier and the information of the LNS-side BRAS forwarder;

According to the tunnel connection response, an L2TP tunnel between the BRAS device on the LAC side and the BRAS forwarder on the LNS side is established.

Wherein, the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater at the LAC end;

The establishment of the L2TP tunnel between the BRAS device on the LAC side and the BRAS repeater on the LNS side is specifically:

An L2TP tunnel between the LAC-side BRAS repeater and the LNS-side BRAS repeater is established.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third bit is a third preset value When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

In addition, the computer-readable storage medium of the embodiment of the present invention is used to store a computer program, and the computer program can be executed by a processor to implement the following steps:

According to the request of the LAC, establish an L2TP tunnel with the LAC;

Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or

One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or,

One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side.

Wherein, according to the request of the LAC, establishing an L2TP tunnel with the LAC includes:

Receive the tunnel connection request of the LAC end; the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater of the LAC end;

sending a tunnel connection response to the LAC end;

An L2TP tunnel is established between the LNS-side BRAS device and the LAC-side BRAS repeater.

Wherein, according to the request of the LAC, establishing an L2TP tunnel with the LAC includes:

receiving a tunnel connection request from the LAC side;

sending a tunnel connection response to the LAC end, where the tunnel connection response includes the second switching control separation identifier and the information of the BRAS repeater at the LNS side;

An L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device is established.

Wherein, the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater at the LAC end;

The establishing the L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device includes:

An L2TP tunnel between the LNS-side BRAS repeater and the LAC-side BRAS repeater is established.

Wherein, the first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; when the third bit is the first preset value When the third bit is the second preset value, it indicates that the LAC end is not a transfer control separation vBRAS system;

The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side.

Wherein, the second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third bit is a third preset value When the third bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system;

The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are:

Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side.

In the several embodiments provided in this application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included individually, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware, or may be implemented in the form of hardware plus software functional units.

The above-mentioned integrated units implemented in the form of software functional units can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, and includes several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute some steps of the transceiving method described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM for short), Random Access Memory (RAM for short), magnetic disk or CD, etc. that can store program codes medium.

The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (26)

1. a tunnel establishment method is characterized in that, is applied to the second layer tunneling protocol L2TP access concentrator LAC, comprises: Obtain the information of the L2TP network server LNS; According to the information of the LNS, establish an L2TP tunnel with the LNS; Wherein, one endpoint of the L2TP tunnel is the broadband remote access server BRAS repeater on the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device on the LNS side; or One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or, One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side. 2. The method according to claim 1, wherein the establishing an L2TP tunnel with the LNS according to the information of the LNS comprises: According to the information of the LNS, send a tunnel connection request to the LNS; the tunnel connection request includes the first transfer control separation identifier and the information of the LAC side BRAS forwarder; receiving a tunnel connection response sent by the LNS; According to the tunnel connection response, an L2TP tunnel between the LAC-side BRAS forwarder and the LNS-side BRAS device is established. 3. The method according to claim 1, wherein the establishing an L2TP tunnel with the LNS according to the information of the LNS comprises: According to the information of the LNS, send a tunnel connection request to the LNS; Receive the tunnel connection response sent by the LNS, and the tunnel connection response includes the second transfer control separation identifier and the information of the LNS-side BRAS forwarder; According to the tunnel connection response, an L2TP tunnel between the BRAS device on the LAC side and the BRAS forwarder on the LNS side is established. 4. The method according to claim 3, characterized in that, in the tunnel connection request, the information of the first transfer control separation identifier and the LAC side BRAS repeater is included; The establishment of the L2TP tunnel between the BRAS device on the LAC side and the BRAS repeater on the LNS side is specifically: An L2TP tunnel between the LAC-side BRAS repeater and the LNS-side BRAS repeater is established. 5. The method according to claim 2 or 4, characterized in that, The first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is a first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; When the bit is the second preset value, it means that the LAC end is not a transfer control separation vBRAS system; The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP: Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side. 6. The method of claim 3, wherein The second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third When the bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system; The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are: Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side. 7. A method for establishing a tunnel, characterized in that, applied to the LNS, comprising: According to the request of the LAC, establish an L2TP tunnel with the LAC; Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or, One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side. 8. The method according to claim 7, wherein the establishing an L2TP tunnel with the LAC according to the request of the LAC comprises: Receive the tunnel connection request of the LAC end; the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater of the LAC end; sending a tunnel connection response to the LAC end; An L2TP tunnel is established between the LNS-side BRAS device and the LAC-side BRAS repeater. 9. The method according to claim 7, wherein the establishing an L2TP tunnel with the LAC according to the request of the LAC comprises: receiving a tunnel connection request from the LAC side; sending a tunnel connection response to the LAC end, where the tunnel connection response includes the second switching control separation identifier and the information of the BRAS repeater at the LNS side; An L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device is established. 10. The method according to claim 9, wherein the tunnel connection request includes the information of the first transfer control separation identifier and the BRAS repeater on the LAC side; The establishing the L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device includes: An L2TP tunnel between the LNS-side BRAS repeater and the LAC-side BRAS repeater is established. 11. The method according to claim 8 or 10, characterized in that, The first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is a first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; When the bit is the second preset value, it means that the LAC end is not a transfer control separation vBRAS system; The attribute parameter of the information of the BRAS transponder at the LAC side is for the AVP: Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side. 12. The method of claim 9, wherein: The second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third When the bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system; The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are: Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side. 13. A tunnel establishment device, characterized in that, applied to a LAC, comprising: a processor and a transceiver; the processor, configured to acquire the information of the L2TP network server LNS; establish an L2TP tunnel with the LNS according to the information of the LNS; Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or, One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side. 14. The apparatus of claim 13, wherein the processor is further configured to: According to the information of the LNS, send a tunnel connection request to the LNS; the tunnel connection request includes the first transfer control separation identifier and the information of the LAC side BRAS forwarder; receiving a tunnel connection response sent by the LNS; According to the tunnel connection response, an L2TP tunnel between the LAC-side BRAS forwarder and the LNS-side BRAS device is established. 15. The apparatus of claim 13, wherein the processor is further configured to: According to the information of the LNS, send a tunnel connection request to the LNS; Receive the tunnel connection response sent by the LNS, and the tunnel connection response includes the second transfer control separation identifier and the information of the LNS-side BRAS forwarder; According to the tunnel connection response, an L2TP tunnel between the BRAS device on the LAC side and the BRAS forwarder on the LNS side is established. 16. The apparatus according to claim 15, wherein the tunnel connection request includes a first transfer control separation identifier and information of a LAC-side BRAS repeater; The processor is further configured to: establish an L2TP tunnel between the LAC-side BRAS repeater and the LNS-side BRAS repeater. 17. The device of claim 14 or 16, wherein The first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is the first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; When the bit is the second preset value, it means that the LAC end is not a transfer control separation vBRAS system; The attribute parameter of the information of the BRAS transponder at the LAC side is for the AVP: Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side. 18. The apparatus of claim 15, wherein The second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third When the bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system; The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are: Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side. 19. A tunnel establishment device, characterized in that, applied to an LNS, comprising: a processor and a transceiver; the processor, configured to establish an L2TP tunnel with the LAC according to the request of the LAC; Wherein, one endpoint of the L2TP tunnel is the BRAS forwarder of the LAC side, and the other endpoint of the L2TP tunnel is the BRAS device of the LNS side; or One endpoint of the L2TP tunnel is a BRAS device at the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder at the LNS side; or, One endpoint of the L2TP tunnel is a BRAS forwarder on the LAC side, and another endpoint of the L2TP tunnel is a BRAS forwarder on the LNS side. 20. The apparatus of claim 19, wherein the processor is further configured to: Receive the tunnel connection request of the LAC end; the tunnel connection request includes the first transfer control separation identifier and the information of the BRAS repeater of the LAC end; sending a tunnel connection response to the LAC end; An L2TP tunnel is established between the LNS-side BRAS device and the LAC-side BRAS repeater. 21. The apparatus of claim 19, wherein the processor is further configured to: receiving a tunnel connection request from the LAC side; sending a tunnel connection response to the LAC end, where the tunnel connection response includes the second switching control separation identifier and the information of the BRAS repeater at the LNS side; An L2TP tunnel between the LNS-side BRAS forwarder and the LAC-side BRAS device is established. 22. The device according to claim 21, wherein the tunnel connection request includes the information of the first transfer control separation identifier and the BRAS repeater on the LAC side; The processor is further configured to establish an L2TP tunnel between the LNS-side BRAS repeater and the LAC-side BRAS repeater. 23. The device of claim 20 or 22, wherein The first transfer control separation identifier is located in the third bit of the tunnel connection request; when the third bit is a first preset value, it indicates that the LAC end is a transfer control separation vBRAS system; When the bit is the second preset value, it means that the LAC end is not a transfer control separation vBRAS system; The attribute parameter of the information of the BRAS transponder at the LAC side is to AVP: Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS repeater at the LAC side. 24. The apparatus of claim 21, wherein The second transfer control separation identifier is located in the third bit of the tunnel connection response; when the third bit is a third preset value, it indicates that the LNS end is a transfer control separation vBRAS system; when the third When the bit is the fourth preset value, it indicates that the LNS end is not a transfer control separation vBRAS system; The attribute parameters of the information of the BRAS repeater on the LNS side to the AVP are: Attribute Type=fifth preset value: BRAS-UP Name AVP, BRAS-UP Name indicates the host name of the BRAS forwarder at the LNS side. 25. A communication device comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor; characterized in that, The processor is used to read the program in the memory to implement the steps in the method according to any one of claims 1 to 6; or to realize the steps in the method according to any one of claims 7 to 12. step. 26. A computer-readable storage medium for storing a computer program, characterized in that, when the computer program is executed by a processor, the steps in the method according to any one of claims 1 to 6 are implemented; or A step in the method of any one of claims 7 to 12.

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