WO2007076692A1

WO2007076692A1 - Method, system and device for bearing vpls service in ip backbone network

Info

Publication number: WO2007076692A1
Application number: PCT/CN2006/003606
Authority: WO
Inventors: Kalyankumar S. Asangi; Vikram Tankasali
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-12-31
Filing date: 2006-12-26
Publication date: 2007-07-12
Also published as: CN1870588A; CN100428739C

Abstract

A method, system and device for bearing VPLS service in an IP backbone network. According to present invention, in the IP network, corresponding L2TPv3 tunnel for transmitting VPLS service is established based on L2TPv3; then the transmission for VPLS service is processed using said L2TPv3 tunnel. Thus, the L2TPv3 signaling protocol is used in IP backbone network, which supports VPLS service, so that the VPLS service is implemented in an IP backbone network, deviating from the MPLS network. Therefore, the VPLS service could be used in a communication popularly, based on the IP network that is well used, while spreading the use of VPLS conveniently.

Description

Method, system and device for carrying VPLS service on IP backbone network

This application claims priority to Chinese Patent Application No. 200510137224.8, entitled "Implementation Method and System for Supporting VPLS Services on IP Backbone Network", filed on December 31, 2005, the entire contents of which are hereby incorporated by reference. Combined in this application. The present invention relates to the field of network communication technologies, and in particular, to a method, system, and device for carrying a VPLS (Virtual Private LAN Service) service on an IP (Internet Protocol) backbone network.

Background technique

VPLS can be used to interconnect LANs in branch offices of enterprises. Users can access the network from multiple geographically dispersed points and access each other. VPLS allows users to extend their LAN (Local Area Network) to MAN. (Municipality Area Network, Metropolitan Area Network), and even WAN (Wild Area Network), providing a foundation for wide-area, multipoint-to-multipoint LAN interconnection.

The VPLS needs to simulate the forwarding mechanism of the LAN, that is, the packet is forwarded by the MAC (Medium Access Control) address, and the packet whose MAC address cannot be hit is forwarded to the port that receives the packet. All other ports of the LAN.

VPLS needs to simulate the LAN learning function, that is, when a message enters from a port, it learns the correspondence between the source MAC address of the packet and the port that the packet enters. In addition, the VPLS simulates the PW (Pseudo Wire) as an Ethernet port. When learning the MAC address, you need to learn the correspondence between the source MAC address and the PW. The PW is dynamically established by the VPLS according to a predetermined rule.

The VPLS also needs to simulate the broadcast function of the LAN, that is, when receiving a packet whose destination MAC address is a broadcast address or a multicast address, the packet is forwarded to other ports.

In the prior art, when the VPLS technology is implemented, the PEs (Provider Edges, Provider Edges) serving the same VPLS domain need to run corresponding signaling protocols to implement LSPs. The establishment of the Switch Path (label switching path) and the allocation of the MPLS (Multi Protocol Label Switch) label.

Currently, there are two types of signaling protocols that can support existing VPLS services: one is LDP (Label Distribution Protocol), and the other is BGP (Border Gate Protocol).

In the prior art, in the VPLS solution based on the two signaling protocols, the corresponding backbone network must adopt an MPLS network, that is, the existing VPLS service is a service provided on the MPLS network, and cannot be separated from the MPLS network. To implement VPLS services. The VPLS service cannot be carried on the IP backbone network, which is not conducive to the further promotion and application of VPLS technology.

Summary of the invention

The embodiments of the present invention provide a method, a system, and a device for carrying a VPLS service on an IP backbone network, so that the VPLS service can be implemented by using an IP network as a backbone network, thereby facilitating the promotion and application of the VPLS service.

According to an embodiment of the present invention, a method for carrying a VPLS service on an IP backbone network includes:

Establish a third version of the Layer 2 tunneling protocol L2TPv3 tunnel for transmitting the virtual private LAN service VPLS service;

The VPLS service to be sent is encapsulated into an L2TPv3 packet and sent by the L2TPv3 tunnel.

The VPLS service is parsed from the received L2TPv3 message and sent to the VPLS service receiving end.

According to still another embodiment of the present invention, a system for supporting a VPLS service on an IP backbone network includes a PE device connected through an IP backbone network;

The configuration information saving module is configured to be configured in the PE device to save VSI configuration information of the VPLS service, where the VSI configuration information includes VSI information indexed by the VSI ID.

An L2TPv3 tunnel establishment module is configured to establish a corresponding L2TPv3 tunnel between the source PE and the destination PE of the VPLS service.

The VPLS transmission processing module is configured to be configured in the VPLS source PE device, and configured to encapsulate the VPLS packet to be sent into an L2TPv3 packet according to the configuration information, and send the packet through the L2TPv3 tunnel. The VPLS receiving and processing module is configured on the VPLS destination PE device, and is configured to receive the L2TPv3 packet from the L2TPv3 tunnel, and forward the VPLS packet to the corresponding CE according to the configuration information.

According to another embodiment of the present invention, a PE device includes:

a configuration information saving module, configured to save VSI configuration information of the VPLS service, where the VSI configuration information includes VSI information indexed by the VSI ID;

An L2TPv3 tunnel establishment module is configured to establish a corresponding L2TPv3 tunnel between the peer PE and the peer PE of the VPLS service;

The VPLS transmission processing module is configured to encapsulate the VPLS packet to be sent as an L2TPv3 packet according to the configuration information, and send the packet to the L2TPv3 tunnel.

The VPLS receiving and processing module is configured to receive the L2TPv3 packet from the L2TPv3 tunnel and forward the VPLS packet to the corresponding CE according to the configuration information when the PE device is the VPLS destination PE device.

According to still another embodiment of the present invention, a system for supporting a VPLS service on an IP backbone network includes: a first PE device and a VPLS source PE device and a VPLS destination PE device interconnected by an IP backbone network a second PE device; the first PE device and the second PE device have an L2TPv3 tunnel for transmitting VPLS services;

The VPLS source PE device is configured to encapsulate the VPLS service to be sent as an L2TPv3 packet, and send the packet through the L2TPv3 tunnel.

The VPLS destination PE device is configured to parse the VPLS service from the received L2TPv3 message and send it to the VPLS service receiver.

The embodiment of the present invention supports the VPLS service on the IP backbone network by using the L2TPv3 signaling protocol, so that the VPLS service can be implemented by using the IP backbone network from the MPLS network, so that the VPLS service can be widely used in the communication network based on the widely used IP network. Application, which makes the promotion and application of VPLS more convenient.

DRAWINGS

FIG. 1 is a schematic diagram of an L2TPv3 technology used in an embodiment of the present invention to establish a layer 2 on an IP network. An example of a VPN instance;

2 is a schematic structural diagram of a VPLS service networking according to an embodiment of the present invention;

3 is a schematic diagram of a specific implementation process of an embodiment of a method according to the present invention;

4 is a schematic structural diagram of a specific implementation of an embodiment of the system of the present invention;

Figure 5 is a block diagram of an embodiment of the PE device shown in Figure 4;

6 is a block diagram of an embodiment of a VPLS service message sending module shown in FIG. 5.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention implement a VPLS solution based on an extended L2TPv3 (Layer 2 Tunnel Protocol Version 3, Layer 3 Layer 2 Tunneling Protocol) technology. The extended L2TPv3 technology can be based on an IP backbone network of the same geographical area. Establish a connection between point-to-multipoint. Since the embodiment of the present invention uses L2TPv3 as signaling to support VPLS services, VPLS services based on the IP backbone network can be implemented.

L2TPv3 technology is a standard tunneling technology that allows a connection between a pair of routers to transmit Layer 2 data, which can be passed through one or more Layer 3 networks in a point-to-point manner. Therefore, the L2TPv3 technology can be used to form a Layer 2 VPN (Virtual Private Network) or to support the interconnection of traditional Frame Relay, ATM (Asynchronous Transfer Mode), and leased line networks.

As shown in FIG. 1, FIG. 1 illustrates an example of establishing a Layer 2 VPN on an IP network by using the L2TPv3 technology adopted in the embodiment of the present invention. CE (Customer Edge, User Edge Devices) 111 and 113 are connected to PE 121, and CEs 112 and 114 are connected to PE 122. The L2TPv3 tunnel is established between the interface 1 and the interface 4, and between the interface 5 and the interface 6. Moreover, the interface 1 and the interface 4 are connected by a pseudo wire (PW, Pseudo Wire) 131, and between the interface 5 and the interface 6 Pseudowires 132 are connected, and each L2TP (Layer 2 Tunneling Protocol) session corresponds to one PW.

The implementation scheme of carrying the VPLS service on the IP backbone network by using the L2TPv3 signaling in the embodiment of the present invention is described below.

Embodiments of the present invention need to establish a control connection and session of L2TPv3 in the implementation process. The control connection and session establishment of the L2TPv3 can be implemented by using existing technologies, and details are not described herein. , where point-to-point and point-to-multipoint pseudowires can be established on the same control connection. The VSI (Virtual Switch Instance) of the VPLS needs to be saved in the embodiment of the present invention. The VSI is required to forward the data packet to assist the PE in performing the forwarding decision of each VPLS packet. The VSI is indexed by the VSI ID (Virtual Switch Instance Identity). The VSI ID is an identifier of the VSI. Different VSIs have different VSI IDs, and all pseudowires belonging to the same VPLS must have the same VSI ID. .

The VSI ID can be implemented through configuration when the L2TPv3 session is established. That is, when an L2TPv3 session is established, the VSI ID can be configured to determine the VPLS to which the pseudowire belongs.

The VSI includes a list of all learned MAC addresses, and the VSI is required to forward the data packets.

The embodiment of the present invention introduces an AC (Attachment Circuit) to identify a VSI at the ingress of the packet, that is, a port or an interface is used to identify a VSI at the CE to PE entry. When the PE receives the packet from the CE, Find the destination MAC address from the VSI corresponding to the port or interface that receives the packet to determine the encapsulation type of the packet and the destination PE of the packet. If the packet received by the PE from the CE is a broadcast or multicast packet. Or if the destination MAC address is not found in the VSI, then the message should be sent to all other PEs in the VPLS.

The embodiment of the present invention uses the local session ID to identify the VSI at the exit of the message. When the PE receives the L2TPv3 message sent by the other PE, the PE searches for the corresponding VSI according to the session ID in the message, and The destination MAC address is searched in the VSI to determine the CE that the packet should forward.

Embodiments of the present invention employ a 64-bit random number as an important barrier to anti-message spoofing attacks. Specifically, a PE is assigned two random cookies. Only the packets carrying the correct cookie value will be accepted in the L2TPv3 message entering the PE. Thus, the probability that a cookie is guessed is 1/2 ^Λ 63. Assuming that it is guessed at the speed of lOMpps, it takes about 29,000 years to guess a correct cookie value.

The specific implementation manner of the method according to the present invention will be described in detail below with reference to the accompanying drawings. As shown in FIG. 2, in the networking structure of the system for implementing VPLS in the embodiment of the present invention, CE 211 and CE 213 are connected to PE 221, CE 212 and CE 214 are connected to PE 222, CE 215, CE 216 and CE 217. Connect to PE 223. PE 221, PE 222, and PE 223 interact through the IP backbone network. As shown in FIG. 3, when the bearer transmission of the VPLS service is performed based on the L2TPv3, the implementation process specifically includes: operation processing of the control plane and data processing of the data plane. The data processing performed by the data plane includes: the processing procedure when the PE receives the VPLS service sent by the CE, and the processing procedure when the PE receives the VPLS service that needs to be sent to the CE.

The flow of an embodiment of the method of the present invention includes:

Step 31: Configure the related information on each PE. The configuration information includes: the VSI ID of the VSI index, the IP address of the peer PE, and the cookie value assigned by the local PE. The peer PE is any other PE connected to the local PE. The IP address of the peer PE is configured to ensure the establishment of the L2TPv3 tunnel and the transmission of VPLS service data.

The specific processing is performed on each PE in the L2TPv3-based network. Step 32: Based on the L2TPv3 protocol, the local PE exchanges local cookie information with the peer PE to establish a corresponding L2TPv3-based control connection and session in the subsequent process.

Step 33: Establish a point-to-point pseudowire or a point-to-multipoint pseudowire for carrying the VPLS based on the L2TPv3, and then use the cookie information of the peer PE obtained by the exchange to establish a corresponding L2TPv3 control connection and session based on the L2TPv3.

Point-to-point and point-to-multipoint pseudowires required for the same VPLS transmission can be established on the same L2TPv3 control connection.

Specifically, whether the remote VSI ID is used in the L2TPv3-based I2Q (Incoming-Call-Request) message to determine whether a pseudo-line or a point-to-multipoint pseudo-line needs to be established. The VSI ID needs to establish a point-to-point pseudowire. Otherwise, a point-to-multipoint pseudowire needs to be established. The two attributes in the ICRQ message are independent of each other.

Step 34: Associate the session ID corresponding to the session established by the pseudowire with the VSI ID, that is, the corresponding pseudowire belongs to the VPLS determined by the VSI ID, and is used for transmitting the corresponding VPLS service data, specifically, configuring the session ID of the pseudowire. Correlation of the VSI ID of the VSI; At the same time, in order to ensure that the peer PE can forward the packet to the corresponding CE according to the VSI information, the association information between the session ID and the VSI ID of the VSI needs to be carried in the message. The peer PE is sent to the peer PE and saved in the peer PE.

After the processing of the above steps 31 to 34, that is, after the operation processing of the control plane is completed, —Ί—

The corresponding data processing can be performed in the data plane, including the following two processes:

(1) The process of connecting to the CE and receiving the VPLS service sent by the CE is:

Step 35: The VPLS packet is sent to the PE at the ingress of the PE, that is, the port on which the PE receives the packet from the CE, and is encapsulated into an L2TPv3 packet according to the configured information.

Specifically, the VSI ID information of the corresponding VPLS is determined by the auxiliary circuit, and the pseudowire information corresponding to the corresponding VSI is searched for, and the L2TPv3^ message is encapsulated according to the corresponding pseudowire information, and the L2TPv3 packet includes the VSI ID corresponding to the VSI ID. Session ID information.

Step 36: The encapsulated L2TPv3 packet is transmitted to the corresponding PE through the L2TPv3 tunnel (that is, the established pseudowire).

It can be a single PE or a lot of PEs.

If the VPLS is a point-to-multipoint service, the PE is a plurality of destination PEs.

If the packet received from the CE is a broadcast or multicast message or the destination MAC address does not find a corresponding match in the VSI, the PE should send the packet to all other PEs in the VPLS. The text is sent to all the pseudowires in the VPLS.

It should be noted that if the destination MAC exists in the VSI and the exchange is remote, the packet is encapsulated in L2TPv3 and then transmitted to the corresponding PE.

If the destination address is in the VSI, but the exchange is local, that is, a CE sends the packet to the other CE through the PE, the packet will be directly forwarded to the corresponding CE through the corresponding interface of the PE. Any L2TPv3 encapsulation is required, and the corresponding interface for forwarding the packet is specifically obtained according to the VSI lookup.

After the PE receives a VPLS packet from the CE, if the source MAC address of the packet does not exist in the VSI, the MAC address M can be learned in the VSI corresponding to the port where the MAC address is located. Processing 4 艮 text application.

(2) When the PE connected to the CE receives the VPLS service to be sent to the CE, the corresponding processing procedure is as follows:

Step 37: The PE receives the L2TPv3 packet that needs to be sent to the CE and carries the VPLS service. Step 38: Remove the L2TPv3 header of the packet before forwarding the packet through the PE egress. VPLS service packet;

Step 39: The VPLS service packet is sent to the corresponding CE through the PE egress end. Specifically, the VSI information is forwarded to the corresponding CE according to the destination MAC address information of the received packet, that is, the packet is forwarded to the corresponding CE. To forward the packet to the corresponding CE at the egress end of the PE: First, determine the VSI to which the packet belongs by using the session ID (session ID) carried in the received L2TPv3 packet.

Then, find the corresponding destination MAC address information in the corresponding VSI. If the destination MAC address is broadcast, multicast, or does not exist in the VSI, the packet is forwarded to the corresponding CE through all the interfaces of the VPLS. If the destination MAC address exists in the VSI, the packet is only passed from the VSI. The specified interface found in the forwarding is forwarded to the corresponding CE.

In addition, when the PE receives the data packet with the MAC address being M from the remote PE, the MAC address M can be associated with the session ID of the remote PE, so that the local PE returns the corresponding information to the peer PE. When searching, the message is accurately returned to the remote PE through the corresponding pseudowire.

In addition, the MAC address in the VSI described in the present invention needs to be aged. When a MAC address entry is added to the VSI, an aging timer is started. When receiving a packet whose source MAC address is M, the aging timer of the entry corresponding to the MAC address M will be refreshed.

A system for supporting a VPLS service on an IP backbone network according to an embodiment of the present invention is shown in FIG. 4, and an embodiment of the system includes PE devices 401 and 402 interconnected by an IP backbone network. The PE devices 401 and 402 have an L2TPv3 tunnel for transmitting VPLS services. PEs 401 and 402 can be VPLS source PEs and VPLS destination PEs.

When the VPLS packet is transmitted, the VPLS source PE device encapsulates the VPLS service to be sent as an L2TPv3 packet and sends the packet through the L2TPv3 tunnel. The VPLS destination PE device parses the VPLS service from the received L2TPv3 packet and sends it to the VPLS service receiver.

In a specific implementation, the PE devices 401 and 402 are respectively provided with:

The configuration information saving module 410 is configured to save VSI configuration information of the VPLS service, where

The VSI configuration information includes the specific VSI information indexed by the VSI ID, and the association information between the VSI ID and the session ID of the L2TPv3 tunnel, the MAC address list, and the IP address information of the peer PE and the cookie obtained by the local PE. information; The L2TPv3 tunnel establishment module 420 is configured to establish a corresponding L2TPv3 tunnel between the source PE and the destination PE of the VPLS service, that is, establish an L2TPv3 pseudowire for transmitting the VPLS service.

The VPLS transmission processing module 430 is configured to encapsulate the VPLS packet to be sent received by the CE into an L2TPv3 packet according to the information stored in the configuration information saving module 410, and send the packet through the corresponding L2TPv3 pseudowire. When the switch is local, the VPLS packet is forwarded to the corresponding CE by the corresponding interface of the PE obtained by the VSI search.

The VPLS receiving and processing module 440 is configured to: receive the L2TPv3 packet sent by the VPLS sending processing module of the peer end, and remove the L2TPv3 packet header; forward the obtained VPLS packet according to the information held by the configuration information saving module 410 to the corresponding CE.

Please refer to FIG. 5. FIG. 5 is a block diagram of an embodiment of the PE device shown in FIG.

In this embodiment, the PE device includes: a configuration information saving module 410, an L2TPv3 tunnel establishment module 420, a VPLS transmission processing module 430, and a VPLS reception processing module 440.

The L2TPv3 tunnel establishment module 420 includes:

The information exchange module 421 is configured to exchange local cookie information based on the L2TPv3 and the peer PE, so as to establish a corresponding L2TPv3-based control connection and session in a subsequent process;

The pseudowire establishing module 422 is configured to establish, according to the L2TPv3, a pseudowire or a point-to-multipoint pseudowire for carrying a point-to-point transmission of the VPLS;

The connection and session establishment module 423 exchanges the obtained cookie information of the peer PE by using the information exchange module 421 to establish a corresponding L2TPv3 control connection and session based on the L2TPv3.

The association module 424 is configured to associate a session ID corresponding to the session established based on the pseudowire with a VSI ID.

The VPLS transmission processing module 430 includes:

The VPLS packet encapsulating unit 431 is configured to determine, according to an affiliation circuit of the VPLS packet, the VSI ID information of the corresponding VPLS, and find the pseudowire information corresponding to the corresponding VSI, and perform L2TPv3 according to the corresponding pseudowire information. Packet encapsulation processing;

The L2TPv3 packet sending module 432 is configured to search for a corresponding VSI according to the destination MAC address, determine the destination PE according to the search result, and transmit the encapsulated L2TPv3 packet to the destination PE through the L2TPv3 pseudowire; The VPLS packet sending unit 433 is configured to search for a corresponding VSI when the localized MAC address is exchanged, and forward the VPLS packet to the corresponding CE by using the corresponding interface of the PE obtained by the VSI. .

The destination PE may be a single PE or many PEs. If the VPLS is a point-to-multipoint service, the PE is a plurality of destination PEs. If the packet received from the CE is a broadcast or multicast message or the destination MAC address does not find a corresponding match in the VSI, the PE should send the packet to all other PEs in the VPLS. The text is sent to all the pseudowires in the VPLS.

It should be noted that if the destination MAC exists in the VSI and the exchange is remote, the packet is encapsulated in L2TPv3 and then transmitted to the corresponding PE. If the destination address is in the VSI, but the exchange is local, that is, a CE sends the packet to the other CE through the PE, the packet is forwarded directly to the corresponding CE through the corresponding interface of the PE. Any L2TPv3 encapsulation is required, and the corresponding interface for forwarding the packet is specifically obtained according to the VSI lookup.

The VPLS receiving processing module 440 includes:

The L2TPv3 decapsulation module 441 is configured to decapsulate the received L2TPv3 packet carrying the VPLS service, and obtain the VPLS service packet.

The VPLS service packet sending module 442 is configured to search for the destination MAC address information of the received packet according to the configured VSI information, and forward the packet to the corresponding CE according to the search result.

Referring to FIG. 6, the VPLS service packet sending module 442 may include:

The VSI determining module 4421 is configured to determine, by using the session ID carried in the received L2TPv3 packet, the VSI to which the packet belongs.

The address information searching module 4422 is configured to search for a corresponding destination MAC address information in the VSI determined by the VSI determining module.

The forwarding module 4423 is configured to forward the address information found by the address information lookup module to the corresponding CE.

Specifically, if the destination MAC address is broadcast, multicast, or does not exist in the VSI, the packet is forwarded to the corresponding CE through all interfaces of the VPLS; if the destination MAC address is in the VSI If yes, only the packet is forwarded to the corresponding CE through the specified interface found in the VSI. In addition, the PE device may further include a first address learning module and a second address learning module. After the PE receives a VPLS packet from the CE, if the source MAC address M of the packet does not exist in the VSI, the first address learning module is configured to learn the MAC address M into the VSI corresponding to the port where the MAC address M is located. , in case of processing the text application next time.

When the PE receives the data packet with the MAC address being M from the remote PE, the second address learning module is configured to associate the MAC address M with the session ID of the remote PE, so as to facilitate the local PE to the peer end. When the PE returns the corresponding packet, it searches for the packet and returns the packet to the remote PE through the corresponding pseudowire.

It should be noted that each of the above modules is usually set in each PE device, so as to facilitate any

The PE can be used as the source and destination of the VPLS to ensure reliable transmission of the VPLS based on the L2TPv3 tunnel.

In summary, the embodiment of the present invention encapsulates a VPLS packet into an L2TPv3 packet and then transmits the VPLS network on the IP backbone network. In addition, a 64-bit random number is set in the VLPS protocol packet. To improve system security and prevent packet spoofing attacks.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

A method for carrying a VPLS service on an IP backbone network, the method comprising: establishing a third version of a Layer 2 tunneling protocol for transmitting a virtual private local area network service VPLS service

L2TPv3 tunnel;

The method for carrying the VPLS service on the IP backbone network according to claim 1, wherein the establishing the L2TPv3 tunnel for transmitting the VPLS service includes:

Establishing an L2TPv3 tunnel between the service provider edge device PE and the at least one peer PE according to the destination information of the VPLS service to be sent;

Associate the established L2TPv3 tunnel information with the virtual switching instance VSI corresponding to the VPLS service.

The method for carrying the VPLS service on the IP backbone network according to claim 2, wherein the establishing the L2TPv3 tunnel for transmitting the VPLS service, the method further includes:

The local PE sends the association between the L2TPv3 tunnel information and the VSI corresponding to the VPLS service to the peer PE of each L2TPv3 tunnel and saves it in the peer PE.

The method for supporting the VPLS service on the IP backbone network according to claim 3, wherein the local PE sends the association between the established L2TPv3 tunnel information and the VSI corresponding to the VPLS service to each L2TPv3. The peer PE of the tunnel is specifically:

The local PE sends the session ID of the L2TPv3 tunnel and the VSI ID of the virtual switch instance ID corresponding to the VPLS service to the peer PE.

The method for carrying the VPLS service on the IP backbone network according to claim 1, wherein after the establishing the L2TPv3 tunnel for transmitting the VPLS service, the method further includes:

Through the established L2TPv3 tunnel, the information exchange process between the PEs at both ends exchanges the respective cookie information between the two PEs.

The method for carrying the VPLS service on the IP backbone network according to claim 1, wherein the VPLS service to be sent is encapsulated into an L2TPv3 message, including: When receiving the VPLS service packet sent by the user-side edge device CE, the local PE searches for the VSI information corresponding to the VPLS service identified by the attached circuit, and determines the media access control MAC address of the destination PE.

The VPLS service packet is encapsulated into an L2TPv3 packet according to the MAC address of the destination PE.

The method for carrying a VPLS service on an IP backbone network according to claim 1, wherein the VPLS service to be sent is encapsulated into an L2TPv3 message and sent through the L2TPv3 tunnel, including:

And when the VPLS service packet is a broadcast or a multicast packet, or the corresponding MAC address is not found in the VSI information, the VPLS service packet is encapsulated into an L2TPv3 packet, and the VPLS is included. All peer PEs.

The method for carrying a VPLS service on an IP backbone network according to claim 1, further comprising:

When the PE receives the VPLS service packet sent by the CE as the local exchange, the PE forwards the VPLS service to the corresponding CE through the local interface.

The method for carrying a VPLS service on an IP backbone network according to claim 1, wherein the step of parsing the VPLS service from the received L2TPv3 message and sending it to the VPLS service receiving end includes :

After receiving the L2TPv3 packet, the PE determines the VSI corresponding to the packet according to the session ID in the packet, and searches for a MAC address of the destination CE in the VSI.

The VPLS service packet with the L2TPv3 packet header removed is sent to the corresponding CE according to the MAC address information of the destination CE.

The method for carrying the VPLS service on the IP backbone network according to claim 1, wherein the parsing the VPLS service from the received L2TP packet and sending the VPLS service to the VPLS service receiving end includes:

If the L2TPv3 message received by the PE is a broadcast or a multicast message, or the MAC address of the destination CE is not found in the VSI, the VPLS service packet with the L2TPv3 packet header is removed and sent to the PE connection included in the VPLS. All CE.

11. The method for carrying VPLS services on an IP backbone network according to claim 1, characterized in that It also includes:

When the PE receives the VPLS packet from the CE, if the source MAC address of the packet does not exist in the VSI, the PE adds it to the VSI corresponding to the port that learns the MAC address.

When the PE receives the L2TPv3 packet from the peer PE, it associates the MAC address information of the packet with the session ID of the peer PE.

The method for implementing the VPLS service on the IP backbone network according to claim 11, wherein the MAC address information in the VSI is set with a corresponding aging timer.

A system for supporting a VPLS service on an IP backbone network, including a PE device connected through an IP backbone network, wherein the PE device includes:

The VPLS transmission processing module is configured to encapsulate the VPLS packet to be sent into an L2TPv3 packet according to the configuration information, and send the packet through the L2TJPv3 tunnel;

The VPLS receiving and processing module is configured to receive the L2TPv3 packet from the L2TPv3 tunnel, and forward the VPLS packet to the corresponding CE according to the configuration information.

14. A PE device, comprising:

The VPLS transmission processing module is configured to encapsulate the VPLS packet to be sent as an L2TPv3 packet according to the configuration information, and send the packet through the L2TPv3 tunnel;

The VPLS receiving and processing module is configured to receive the L2TPv3 packet from the L2TPv3 tunnel, and forward the VPLS packet to the corresponding C according to the configuration information.

The PE device according to claim 14, wherein the L2TPv3 tunnel establishment module comprises:

An information exchange module, configured to exchange local cookie information based on the L2TPv3 and the peer PE; a pseudowire establishing module, configured to establish a pseudowire or a point-to-multipoint pseudowire for carrying a point-to-point transmission of the VPLS based on the L2TPv3;

The connection and session establishment module uses the cookie information exchange module to exchange the obtained cookie information of the peer PE based on the L2TPv3 to establish a corresponding L2TPv3 control connection and session.

An association module is configured to associate a session ID corresponding to the session established based on the pseudowire with a VSI ID.

The PE device according to claim 14, wherein the VPLS transmission processing module comprises:

The VPLS packet encapsulating module is configured to determine the VSI ID information of the corresponding VPLS according to the auxiliary circuit that the VPLS packet enters, find the pseudowire information corresponding to the corresponding VSI, and perform L2TPv3 packet encapsulation processing according to the corresponding pseudowire information;

The L2TPv3 packet sending module is configured to search for a corresponding VSI according to the destination MAC address, determine the destination PE according to the search result, and transmit the encapsulated L2TPv3 packet to the destination PE through the L2TPv3 pseudowire.

The PE device according to claim 14, wherein the VPLS receiving processing module comprises:

The L2TPv3 decapsulation module is configured to decapsulate the received L2TPv3 packet carrying the VPLS service, and obtain the VPLS service packet.

The VPLS service packet sending module is configured to forward the configured VSI information to the corresponding CE according to the destination MAC address information of the received packet.

The PE device according to claim 17, wherein the VPLS service message sending module includes -.

a VSI determining module, configured to determine, by using the session ID carried in the received L2TPv3 packet, the VSI to which the packet belongs;

An address information searching module, configured to search for a corresponding destination MAC address information in the VSI determined by the VSI determining module;

And a forwarding module, configured to forward, according to the address information found by the address information searching module, to the corresponding CE.

The PE device according to claim 14, further comprising: The first address learning module is configured to learn the source MAC address of the VPLS packet received from the CE that does not exist in the VSI, and add it to the VSI corresponding to the port.

The PE device according to claim 14, further comprising: a second address learning module, configured to learn a MAC address of the data packet received from the remote PE, and the MAC address M and the remote PE The session ID is associated.

A system for supporting a VPLS service on an IP backbone network, comprising: a first PE device and a second PE device that are interconnected by an IP backbone network and are VPLS source PE devices and VPLS destination PE devices. Having an L2TPv3 tunnel for transmitting VPLS services between the first PE device and the second PE device;