WO2008092357A1

WO2008092357A1 - A method and device for establishing a pseudo wire tunnel and transmitting message using it

Info

Publication number: WO2008092357A1
Application number: PCT/CN2007/071347
Authority: WO
Inventors: Pingan Yang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-01-25
Filing date: 2007-12-27
Publication date: 2008-08-07
Also published as: CN101001196A

Abstract

A method and device for establishing a pseudo wire tunnel and transmitting message using it is provided, which belong to communication area. For meeting the requirements that a network device transmits message control information with the message when it is forwarded and transmitting the message from point to multi-point, a method for establishing a pseudo wire tunnel and transmitting message using it is provided, and the method includes: establishing a virtual interface at an out/ in service provider edge device respectively, and the virtual interface acts as an AC link interface of the out/ in service provider edge device, and establishingpseudo wire PW, and binding the virtual interface and the PW at the same time; the in service provider edge device forwards the message to user edge device via the virtual interface, PW and the out service provider edge device. A device for establishing a pseudo wire tunnel and transmitting message using it is also provided, the device includes a virtual interface establishing module, a PW establishing module, a binding module and a message forwarding module.

Description

Method and device for establishing pseudowire tunnel and using it to transmit message

[I] Technical field

[2] The present invention relates to the field of communications, and in particular, to a method and apparatus for establishing a pseudowire tunnel and transmitting a message using the same.

[3] Background Art

[4] PWE3 (Pseudo Wire Emulation Edge to

Edge-end-to-end pseudowire emulation) is a capability that can be used in PSN (Packet Switched

Network-packet switching network) A technical mechanism that simulates the important characteristics of telecommunications services. PWE3 pseudowire

PW (Pseudo

Wire) Encapsulate the ingress ports of cells, packet data units, or specific service bitstreams and carry them through IP (Internet Protocol) or MPLS (Multi-Protocol Label)

Switching - Multi-Protocol Label Switching) The channel is transmitted. PW provides the following main features:

[5] 1·To arrive at PE (Provider

Edge-operator edge) Formatting the specific service or circuit data of the device port;

[6] 2. Carrying the encapsulated service data through the PSN channel;

[7] 3. Establish PW between PSN channel endpoints, exchange and assign PW identification symbols;

[8] 4. Manage the signaling, ordering, ordering and other parts of the service at the PW edge;

[9] 5. Various business related status and alarm management. From the customer edge (CE-Customer

Edge) From a device perspective, a PW is a non-shared link or circuit that carries a selected service.

[10] In a PWE3 network model shown in Figure 1, in order to enable customer edge devices CE1 and CE2 to be in PS

On the N network, two carrier edge devices PE1 and PE2 need to provide one or more PWs. Raw data unit through AC (Attachment

Circuit, access circuit) The link is transmitted to the PE device and encapsulated into the PW-PDU (Packet Data)

Unit-packet data unit), then carried over the PSN network. For the core network, PW traffic is invisible, and for CE devices, the core network is also transparent.

[II] PWE3 provides an end-to-end emulation service, that is, packets from an AC link can only be used by default. Entering a fixed PW, but in actual applications, it is possible that packets from an AC link need to reach multiple destinations through multiple PWs. For example, in the point-to-multipoint networking shown in Figure 2, The user under the gateway 1 needs to communicate with the user under the gateway 3, and also needs to communicate with the user under the gateway 2, and the application cannot use the three-layer VPN based on the IP route (Virtural Private

Network-Virtual Private Network technology, for example, needs to perform IP header compression on the PE to remove information such as IP addresses to save link bandwidth and need to pass additional control information along with the path.

[12] In order to achieve the above purpose, the packets sent from the same link can be mapped to different tunnels as needed to be sent to different destinations. One solution in the prior art is: Packets of different destinations are allocated to different AC links, and multiple PWs are deployed between the PEs. However, this solution requires a large number of PWs and a large number of AC link interfaces. CE also supports the function of distributing packets to different AC links, which is expensive to deploy.

[13] Another solution in the prior art is: Configure a policy on the PE device to import packets to different PW tunnels according to the policy, and then send the packets to the corresponding peer device. However, this solution requires a large number of policies to be configured on the PE. The configuration is complicated, and the related policies are handled more frequently than the normal forwarding. The forwarding efficiency is affected.

[14] Summary of the invention

[15] In order to meet the requirements of the network device for transmitting message control, packet transmission, and packet-to-multicast transmission, the embodiment of the present invention proposes to establish a pseudowire tunnel and use the same to transmit a message. method,

[16] A method for establishing a pseudowire tunnel and using the same to transmit a packet, the method comprising: establishing a virtual interface on the outbound/ingress operator edge device, and using the virtual interface as the outbound/ingress operator The access circuit of the edge device is connected to the AC link interface, and the pseudowire PW is established, and the virtual interface is bound to the PW.

[17] The ingress operator edge device receives the packet, and sends the packet to the egress operator edge device according to the destination address of the packet and the binding relationship between the virtual interface and the PW. The export operator edge device forwards the packet to the destination customer edge device.

[18] A method for establishing a pseudowire tunnel and using the same to transmit a packet, the method comprising: establishing a virtual interface and a configuration template on an edge device of the egress/ingress operator, where the template is configured to establish a pseudo a service parameter of the line PW, associate the template with a label distribution protocol to establish a PW, and associate the PW with the virtual The intended interface is bound:

[19] The ingress operator edge device receives the packet, and sends the packet to the egress operator edge device according to the destination address of the packet and the binding relationship between the virtual interface and the PW, where the egress operator The edge device forwards the message to the destination customer edge device.

[20] An apparatus for establishing a pseudowire tunnel and transmitting a message using the same, the apparatus comprising a virtual interface establishing module

, PW establishment module, binding module, and message forwarding module;

[21] The virtual interface establishing module is configured to establish a virtual interface on an operator edge device;

[22] The PW establishing module is configured to use the virtual interface established by the virtual interface establishing module as an AC link interface of the operator edge device, and establish a pseudo line PW between the operator edge devices;

[23] The binding module is configured to bind the virtual interface established by the virtual interface establishing module to the PW established by the PW establishing module;

[24] The packet forwarding module is configured to forward the packet to the other client edge device through the virtual interface and the PW bound by the binding module.

[25] An apparatus for establishing a pseudowire tunnel and transmitting a message using the same, the apparatus comprising a virtual interface establishing module

, a configuration module, a PW establishment module, a binding module, and a packet forwarding module;

[26] The virtual interface establishing module is configured to establish a virtual interface on the operator edge device;

[27] The configuration module is configured to configure a template on the operator edge device, and configure a service parameter for establishing a pseudowire PW between the operator edge devices on the configured template.

[28] The PW establishing module is configured to associate a template configured by the configuration module with a label distribution protocol.

W;

[29] The binding module is configured to bind the virtual interface established by the virtual interface establishing module to the PW established by the PW establishing module.

[30] The packet forwarding module is configured to forward the packet to the destination client edge device through the virtual interface and the PW bound by the binding module.

[31] Advantageous Effects: Embodiments of the present invention provide a method for establishing a pseudowire tunnel by using a virtual interface and a configuration template, and a method for transmitting a message by using the pseudowire tunnel.

[32] BRIEF DESCRIPTION OF THE DRAWINGS

[33] FIG. 1 is a schematic diagram of a PWE3 network model in the prior art; 2 is a schematic diagram of a point-to-multipoint networking in the prior art;

3 is a schematic diagram of establishing a pseudowire tunnel and transmitting a message using the same in the embodiment of the present invention;

4 is a flowchart of a method for establishing a pseudowire tunnel and transmitting a message by using the same in the embodiment of the present invention;

[37] FIG. 5 is a schematic diagram of user packets after PW encapsulation in the embodiment of the present invention;

6 is a structural diagram of a first device for establishing a pseudowire tunnel and transmitting a message using the same in the embodiment of the present invention.

7 is a structural diagram of a second apparatus for establishing a pseudowire tunnel and transmitting a message using the same in the embodiment of the present invention.

[40] Detailed implementation

[41] The present invention will be further described with reference to the accompanying drawings and specific embodiments, but not to limit the invention

[42] In order to achieve the object of the present invention, the embodiment of the present invention establishes a virtual interface on the operator edge device PE, and the virtual interface serves as an AC link interface in the PWE3, and various service parameters are configured on the virtual interface according to requirements. For example, the encapsulation type of the packet, the compression mode of the compressed packet, and so on. The edge device of the carrier establishes a PW according to the PWE3 protocol, and provides the PW as a tunnel to other services, such as a virtual private network, and binds the PW to the virtual interface to provide a new type of interface for other services. The destination address of the packet to be forwarded on the edge device of the service provider is associated with the corresponding PW. The forwarding table of the forwarding destination address and the associated information of the corresponding PW is generated, and the packet is forwarded to the customer edge device CE according to the forwarding table.

[43] The method for transmitting a message by using the virtual interface, the forwarding table, and the PW established on the PE device includes the following specific steps, and the schematic diagram of establishing a pseudowire tunnel and transmitting the packet by using the same according to the embodiment of the present invention is shown in FIG. 3. As shown in FIG. 4, the specific processing procedure includes the following steps:

[44] Step 401: Establish a virtual interface on PE1, PE2, and PE3, and use the virtual interface as the AC link interface in PWE3, and establish PW1 and PW2 according to the PWE3 procedure.

[45] Step 402: Associate PW1 and PW2 with destination addresses CE2 and CE3 respectively to generate a forwarding table.

[46] Step 403: The PE1 receives the user packet 1 and the user packet 2 sent by the CE1, and searches for the corresponding forwarding table according to the user addresses 1 and the destination addresses CE2 and CE3 of the user packet 2.

[47] Step 404: According to the tunnel information PW1 and PW2 associated with the destination address CE2 and CE3 in the forwarding table, User message 1 and user message 2 are PW encapsulated.

[48] Figure 5 is a schematic diagram of user packets after PW encapsulation, each of which is described as follows:

[49] The tunnel forwarding packet header includes a Layer 2 packet header and a tunnel label.

[50] The PW package header includes PW tag and package control information. The package control information is optional. It can be added according to PWE3 and related procedures as needed. The control information can be any control information defined by various services, such as whether the encapsulated packet is an IP packet, whether IP header compression is performed, and the like.

[51] The original label from the service is used to identify the relevant information of the service. In order to save the link bandwidth, the inner label of the original service strip can be removed, and the relevant information can be directly transmitted through the PW label. For example, BGP/MPLS

The VPN service can bind the virtual interface to the corresponding VPN and send the binding relationship to the corresponding PW entry. According to the PW entry, you can know which VPN the packet is forwarded to, so that the BG P cannot be transmitted. / inner label of the MPLS VPN.

[52] A user message may be a processed message, such as a message compressed by an IP header.

[53] Step 405: PE1 forwards user packet 1 and user packet 2 encapsulated by the PW to the egress devices PE2 and PE3 through tunnels PW1 and PW 2, respectively.

[54] Step 406: PE2 and PE3 respectively search for the corresponding PW entry according to the PW label information of the user packet 1 and the user packet 2, and decapsulate the user packet 1 and the user packet 2 accordingly, and then the user is reported. The text 1 and user packet 2 are forwarded to the destination devices CE2 and CE3.

[55] Because the virtual interface established on the PE device can directly participate in the IP route calculation and is used as the outbound interface, you can also associate the destination address of the packet to be forwarded with the virtual interface through IP route calculation or static route configuration. For example, in Figure 3, the destination address CE2 is associated with the virtual interface 1, the destination address CE3 is associated with the virtual interface 2, and the association relationship is written into the forwarding table. The forwarding table is searched according to the destination address of the user packet, and the associated table is found. The virtual interface forwards the packet. The process of transmitting a message in this way is the same as the process of transmitting a message by establishing a destination address and a PW, and will not be described here.

[56] In addition, by configuring a template on the PE device, configuring a service parameter for establishing a pseudowire PW on the template, associating the template with a label distribution protocol to establish a PW, and binding the PW to the virtual interface. Providing the PW as a tunnel to other services, and using this method to implement the process of transmitting messages and the above The process of transmitting a message by establishing a destination address and a PW association is the same, and will not be described here.

[57] Referring to FIG. 6, a device for establishing a pseudowire tunnel and transmitting a message using the same according to an embodiment of the present invention is provided.

, including a virtual interface establishing module, a PW establishing module, a binding module, and a packet forwarding module;

[58] The virtual interface establishing module is configured to establish a virtual interface on the egress/ingress PE device respectively;

[59] The PW establishment module is used to use the virtual interface established by the virtual interface establishment module as the outbound/ingress PE device.

C link interface, and establish a pseudowire PW;

[60] The binding module is configured to bind the virtual interface established by the virtual interface establishment module and the PW established by the PW establishment module;

[61] The packet forwarding module is used to forward packets to the client edge device through the virtual interface bound to the binding module and the PW.

[62] Another device for establishing a pseudowire tunnel and transmitting a message using the same according to the embodiment of the present invention is as shown in FIG. 7. The device includes a virtual interface establishing module, a configuration module, a PW establishing module, a binding module, and a packet. Forwarding module

[63] The virtual interface establishing module is configured to establish a virtual interface on the ingress/egress PE device respectively;

[64] The configuration module is configured to configure a template on the outbound/ingress PE device, and configure a service parameter for establishing a pseudowire PW on the configured template.

[65] The PW establishing module is configured to associate a template configured by the configuration module with a label distribution protocol to establish a PW;

[66] The binding module is configured to bind the virtual interface established by the virtual interface establishing module to the PW established by the PW establishing module;

[67] The packet forwarding module is used to forward packets to the client edge device through the virtual interface bound to the binding module and the PW.

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

Claims

Claim

[1] A method for establishing a pseudowire tunnel and using the same to transmit a packet, wherein the method includes: establishing a virtual interface on the edge device of the ingress/ingress operator, and using the virtual interface as a The access circuit AC link interface of the ingress/ingress operator edge device is set up, the pseudowire PW is established, and the virtual interface is bound to the PW,

The ingress operator edge device receives the packet, and sends the packet to the egress operator edge device according to the destination address of the packet and the binding relationship between the virtual interface and the PW. The export operator edge device forwards the message to the destination customer edge device.

[2] 2. A method of establishing a pseudowire tunnel and transmitting a message using the same according to claim 1, wherein

The virtual interface is at least one, and correspondingly, the PW is at least one, and the virtual interface is bound to the PW one by one.

[3] The method for establishing a pseudowire tunnel and using the same to transmit a message according to claim 2, wherein the ingress operator edge device according to the destination address of the packet, and the virtual interface and The step of sending the packet to the egress operator edge device includes:

The destination address of the packet to be forwarded by the ingress operator edge device is associated with the forwarding channel PW and/or the virtual interface, and the forwarding table associated with the PW is generated; The destination address of the packet is searched for the forwarding table, and the packet is forwarded to the egress operator edge device.

[4] 4. A method of establishing a pseudowire tunnel and transmitting a message using the same according to claim 3, characterized in that

The step of the ingress operator edge device searching the forwarding table according to the destination address of the packet, and forwarding the packet to the egress operator edge device includes:

The ingress operator edge device searches the forwarding table according to the destination address of the packet, and encapsulates the packet according to the PW information associated with the destination address of the packet in the forwarding table, and encapsulates the packet. The encapsulated packet is forwarded to the egress operator edge device through the virtual interface bound to the PW and the PW.

[5] 5. A method of establishing a pseudowire tunnel and transmitting a message using the same according to claim 4, characterized in that

The step of encapsulating the packet includes: adding a PW label and/or a packet to the packet Install control information.

[6] 6. A method of establishing a pseudowire tunnel and transmitting a message using the same according to claim 3, characterized in that

The step of forwarding, by the egress operator edge device, the packet to the client edge device includes:

The egress operator edge device decapsulates the encapsulated packet, and searches for the corresponding PW entry according to the PW label information of the encapsulated packet, and passes the decapsulated packet The virtual interface bound to the PW is forwarded to the client edge device.

[7] The method for establishing a pseudowire tunnel and using the same to transmit a message according to any one of claims 1 to 6, wherein the virtual interface serves as an edge of the egress/entry operator The outbound interface of the device is used.

[8] 8. A method for establishing a pseudowire tunnel and using the same to transmit a packet, the method comprising: establishing a virtual interface and a configuration template on the edge device of the egress/ingress operator, respectively, in the template Configuring a service parameter for establishing a pseudowire PW, associating the template with a label distribution protocol to establish a PW, and binding the PW to the virtual interface:

The ingress operator edge device receives the packet, and sends the packet to the egress operator edge device according to the destination address of the packet and the binding relationship between the virtual interface and the PW, where the egress operator edge device re- Forward the message to the destination customer edge device.

[9] A device for establishing a pseudowire tunnel and using the same to transmit a message, wherein the device includes a virtual interface establishing module, a PW establishing module, a binding module, and a packet forwarding module; Establishing a module, configured to establish a virtual interface on the operator edge device; the PW establishing module, configured to use the virtual interface established by the virtual interface establishing module as an AC link interface of the operator edge device, and establish an operator edge Pseudowire PW between devices;

The binding module is configured to bind the virtual interface established by the virtual interface establishing module to the PW established by the PW establishing module;

The packet forwarding module is configured to forward the packet to the other client edge device through the virtual interface and the PW bound by the binding module.

[10] 10. Apparatus for establishing a pseudowire tunnel and using the same to transmit a message, wherein the device comprises a virtual interface establishing module, a configuration module, a PW establishing module, a binding module, and a packet forwarding module. The virtual interface establishing module is configured to establish a virtual interface on the operator edge device; the configuration module is configured to configure a template on the operator edge device, and configured to establish a carrier edge device on the configured template. The business parameters of the pseudowire PW;

The PW establishing module is configured to associate a template configured by the configuration module with a label distribution protocol to establish a PW;

The packet forwarding module is configured to forward the packet to the destination client edge device through the virtual interface and the PW bound by the binding module.