WO2009065349A1

WO2009065349A1 - Layer 2 control proxy method, device and system

Info

Publication number: WO2009065349A1
Application number: PCT/CN2008/073068
Authority: WO
Inventors: Ruobin Zheng
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2007-11-15
Filing date: 2008-11-14
Publication date: 2009-05-28
Also published as: CN101437013A

Abstract

An L2C method, device and communication system for supporting line binding. The method includes: a layer 2 control L2C proxy obtaining line port information or line binding port information in a received message; the L2C proxy converting the line port information in the message to line binding port information, or converting the line binding port information in the message to line port information according to the mapping relation of the line binding. According to an embodiment of the present invention, a service provider equipment only needs to manipulate the line binding port, which can guarantee that changes of physical port (or logical port) or of line binding relations will not impact on the service processes provided by the service provider equipment, and also can guarantee that changes of the line binding relation will not impact on access equipment.

Description

Layer 2 control agent method, device and system

This application claims priority to Chinese Patent Application No. 200710124638.6, entitled "A Layer 2 Control Agent Method, Apparatus and System," filed on November 15, 2007, the entire contents of which are hereby incorporated by reference. Combined in this application.

Technical field

The present invention relates to communication technologies, and more particularly to a method, apparatus and system for a Layer 2 control agent that supports line bundling.

Background technique

The Layer 2 Control Protocol (L2CP) is mainly used for topology discovery, line configuration, line testing, and multicast control. When the access network needs to add control to its equipment to support new services, the L2CP uses a Broadband Remote Access Service (BRAS) to control a large number of access nodes (Access Node, hereinafter referred to as "AN" ) can reduce the burden on the operational support device to control each device accessing the network.

Line bundling is a common technology. Currently, there are two main implementation methods: 1> Bundling multiple access lines to provide more bandwidth, longer distance, and higher reliability. Typically, the number is The subscriber line (Digital Subscriber Line, hereinafter referred to as "DSL") line is bound, such as a universal single-pair high-speed digital subscriber loop (G.SHDSL). For example, a video stream has a bandwidth of 6M, but an xDSL line can only provide a maximum of 4M bandwidth. By bundling two pairs of DSL lines to transmit a 6M video stream; 2> interconnection or uplink aggregation, such as link aggregation (Link Aggregation) technology, chain Road aggregation is the aggregation of multiple physical links to form a logical link.

In the prior art, the DSL physical port (or logical port) of the Digital Subscriber Line Access Multiplexer (hereinafter referred to as "DSLAM") is operated by SP (Service Provier, service operator, Figure 1 is operated by the Internet). For example, the ISP is configured to perform physical port (or logical port) partitioning. The ISP directly controls the DSL physical port (or logical port) of the corresponding partition through the L2CP. In order to reduce the Layer 2 Control (hereinafter referred to as "L2C") message traffic, the L2C proxy is introduced, that is, the IWF (Interworking Function) in Figure 1, and the L2C message is filtered by ISP or AN, and the detection is performed. Convergence forwarding. Typically, the IWF is located in an Ethernet switch and BRAS.

In the process of implementing the present invention, the inventors have found that the prior art has at least the following problems: L2C pair The DSLAM is controlled by physical port and does not support line bundling across the AN or across boards and different physical ports on the same board in the same AN. In particular, when an ISP needs to support multiple different physical port (or logical port) line bundling across an AN or across a board, the ISP needs to know not only the physical port but also the physical port to line bundling. When the DSLAM is upgraded or performs other maintenance, the physical port must be kept unchanged. Otherwise, the line binding relationship changes must be reconfigured to the ISP, which increases the difficulty of expanding the DSLAM. At the same time, it coordinates network access operations. Businesses and ISPs bring shocks and costs to the operation. Summary of the invention

The present invention provides an L2C proxy method, apparatus, and system for the deficiencies mentioned in the prior art, and introduces a "line bundle mapping" in the L2C proxy to implement port isolation between the carrier device and the access device.

The embodiment of the invention provides a line binding mapping method, including:

The L2C proxy obtains the line port information or the line bundle port information in the received message; the L2C proxy sets the line port information in the packet according to the line bundle mapping relationship between the stored line port information and the line bundle port information. Convert to line bundle port information, or convert line bundle port information in the message to line port information.

The embodiment of the present invention further provides an L2C proxy device, including a message receiving unit, a line bundling mapping unit, and a text sending unit, where

The message receiving unit is configured to receive a message;

The line bundling mapping unit is configured to convert the line port information in the packet received by the packet receiving unit into the line bundle port information according to the line bundling mapping relationship information between the line port and the line bundling port, or Converting line bundle port information in the packet into line port information;

The message sending unit sends the message converted by the mapping conversion processing unit.

The embodiment of the invention further provides a communication system, including a first device, a second device, and a layer two control

L2C proxy device, where:

The first device sends a message including line port information or a message including line bundle port label information;

Receiving, by the L2C proxy device, the packet sent by the first device, according to the stored line bundle mapping Relationship, after the line port information in the packet is converted into the line bundle port information, or sent, or the line bundle port information in the packet is converted into line port information and sent;

The second device receives the message converted by the L2C proxy device.

The first device includes an access node AN, and the second device includes a broadband access server BRAS or a broadband network gateway BNG or a service provider ISP device; the L2C proxy device is separately configured or integrated in the first device or the second device. In the device.

The first device is a remote AN, the L2C proxy device is integrated inside the AN, and the second device is a BRAS or BNG or ISP device.

It can be seen from the above technical solution that the L2C proxy of the present invention can be separately set or integrated in the first device or the second device. The line bundle provided by the present invention can be a line bundling relationship across the AN or across the circuit board, not only the same Line bonding of multiple different physical ports (or logical ports) on the same board in an AN can also be bundled for multiple different physical ports (or logical ports) across the AN or across the board; The change of the port (or logical port) or the line binding relationship does not affect the service process of the carrier device. It also ensures that the change of the line binding relationship does not affect the access device.

DRAWINGS

1 is a schematic diagram of a prior art L2C proxy system;

2 is a schematic diagram of a communication processing procedure according to an embodiment of the present invention;

3 is a structural diagram of a communication proxy device according to an embodiment of the present invention;

4(a) and 4(b) are schematic diagrams showing the separate setting of the L2C agent in the embodiment of the present invention;

5 is a schematic diagram of an agent in which a line bundling unit is placed inside an AN according to an embodiment of the present invention; FIG. 6(a) and FIG. 6(b) are schematic diagrams showing a proxy of a line bundling unit placed inside a BNG/BRAS according to an embodiment of the present invention;

7(a) and 7(b) are schematic diagrams showing the L2C proxy of the AN with the remote AN in the embodiment of the present invention. detailed description

Embodiments of the present invention provide an L2C proxy method, apparatus, and system that support line bundling. The technical solution of the embodiment of the present invention is further described in detail below.

The first device includes an access device, such as an AN, and the second device may be a BRAS, a Broadband Gateway (BNG) or a service carrier (such as an ISP); or The first device includes a BRAS, BNG or ISP device, and the second device is an AN. The first device in the embodiment takes the access device as an example, and the second device takes the service carrier device as an example. When the first device or the second device is another device, the principle is the same.

The process of communication between the service provider device and the access device through the L2C proxy is as shown in FIG. 2. The L2C proxy obtains the physical port (or logical port) information or the line bundle port information in the received packet; the L2C agent bundles according to the line. The mapping relationship completes the mutual conversion of physical port (or logical port) information and line bundle port information. Specifically, it may include:

(1) Upward direction

The L2C proxy receives the packet sent by the access device to the service carrier device, where the packet includes a physical port (or logical port) identifier and/or a corresponding media access control (MAC) address; and the L2C proxy obtains the scheduled storage. Mapping between a physical port (or a logical port) and a line bundle port, and converting the physical port (or logical port) identifier and/or the corresponding MAC address in the message to the corresponding mapping according to the mapping relationship The line bundles the port identifier and/or the corresponding MAC address; sends the converted packet containing the line bundle port identifier and/or the corresponding MAC address to the SP device.

(2) Downward direction

The L2C proxy receives the packet sent by the service provider device to the access device, where the packet includes the line bundle port identifier; and the L2C proxy obtains the mapping relationship between the predetermined physical port (or logical port) and the line bundle port. And converting, according to the mapping relationship, a packet with the line binding port identifier and/or the corresponding MAC address, and converting the packet with the corresponding physical port (or logical port) identifier and/or the corresponding MAC address. After the conversion processing, the physical port (or logical port) identifier and/or the corresponding MAC address packet are sent to the access device.

The above-mentioned packet includes a control packet and/or a data packet, and the control packet includes an L2CP packet or an authentication, authorization, and accounting (AAA) packet, and the data packet includes a dynamic host configuration protocol (DHCP) packet. Text or Ethernet bears Point-to-Point Protocol (PPPoE) messages. Further, the control packet exchanged between the service provider device and the access device, or the control packet exchanged between the IP edge device and the access device connected to the service provider device, may be An L2C packet based on L2CP, Layer 2 Tunneling Protocol (L2TP) or AAA for configuration management of the physical port (or logical port). If the mapping relationship is not saved in advance, the mapping relationship between the physical port (or logical port) and the line bundle port may be pre-configured and saved in the L2C proxy. Corresponding to the above-mentioned line bundling method, an L2C proxy device, as shown in FIG. 3, includes a message receiving unit, a message sending unit, and a line bundling mapping unit. among them:

(1) Message receiving unit

The unit is specifically configured to receive a packet exchanged between the service provider device and the access device, where the packet may be a control packet or a data packet, where the control packet may be L2C (Layer 2) Control, layer 2 control), such as L2CP (Layer 2 Control Protocol), L2TP (Layer 2 Tunneling Protocol), or AAA (Authentication, Authorization and Accounting, Authentication) 4, authorized and billed).

(2) Line Bundling Mapping Unit

The unit is specifically configured to obtain a many-to-one mapping relationship between a predetermined physical port (or logical port) and a line bundle port, and obtain a physical port (or a logical port) in the packet received by the packet receiving unit. Or line binding port information, and performing conversion processing between the physical port (or logical port) and the line binding port according to the mapping relationship;

Further, the line bundle mapping unit may specifically include a mapping relationship storage unit and a mapping conversion processing unit, where:

a mapping relationship storage unit, configured to acquire and store a one-to-many mapping relationship between a predetermined line bundle port and a physical port (or a logical port), or acquire and store between a predetermined physical port (or a logical port) and a line bundle port The many-to-one mapping relationship is as shown in Table 1. The access circuit identifier in the table may be a physical port identifier or a logical port identifier.

a mapping conversion processing unit, configured to perform physical port (or logical port) and a line on the physical port (or logical port) or the line bundle port information in the received packet according to the mapping relationship saved in the mapping relationship storage unit The conversion process between the bundled ports may be: converting the physical port (or logical port) identifier and/or the corresponding MAC address in the packet sent by the access device to the service carrier device to the line bundle port identifier and/or Or corresponding MAC address, the packet with the line bundle port identifier and/or the corresponding MAC address sent by the service carrier device to the access device is converted into a group with corresponding physical port (or logical port) identifier and/or corresponding The MAC address of the ^ 艮 text.

(3) Message sending unit Corresponding to the packet receiving unit, the unit is configured to send the packet processed by the line bundling mapping unit, including sending, to the service provider device, the packet including the line bundle port identifier and/or the corresponding MAC address. And sending, to the access device, the converted packet including the physical port (or logical port) identifier and/or the corresponding MAC address.

Corresponding to the above-mentioned line bundling method and communication proxy device, a communication system includes an access device, a service operator device, and an L2C proxy device, wherein the access device is configured to send a physical port (or logical port) identifier and/or Or the corresponding MAC address or the message containing the line bundle port identifier and/or the corresponding MAC address;

The L2C proxy device is the device including the text receiving unit, the mapping relationship storage unit, the mapping conversion processing unit, and the message transmitting unit described above. For performing mutual conversion between the physical port (or logical port) identifier and/or the corresponding MAC address and the line bundle port identifier and/or the corresponding MAC address according to the line bundle mapping relationship;

The service provider device is configured to receive the message converted by the L2C proxy device or send a message including a line bundle port identifier and/or a corresponding MAC address.

Among them, the L2C proxy device can be set independently, as shown in Figure 4 (a), 4 (b). Alternatively, it may be integrated in an access device or an IP edge device, or may be integrated in an intermediate device between the access device and the service carrier device.

Further, the communication system may further include an interconnection function unit connected between the L2C proxy device and the operator device, that is, an IWF unit, which may be specifically configured to transmit the L2C proxy device and the operation by using a layer 2 control message. Information exchanged between businesses.

In addition, the L2C agent of the present invention can also be integrated in the AN, as shown in Fig. 5; or can be integrated in the BNG/BRAS, as shown in Fig. 6 (a) and 6 (b).

For the application scenario where the AN has a remote AN, the line bundle is for the remote AN physical port (or logical port) bundle, and the L2C proxy device is integrated inside the AN, as shown in Figure 7 (a), 7 (b).

The following takes the L2C message, the DHCP message, and the PPPoE (Ethernet Bearer Point-to-Point Protocol) message as an example to specifically describe the mapping conversion process.

For L2C messages:

In the uplink direction, the "Line Bundling Mapping Unit" queries the L2C message from the AN by the physical port (or logical port) identifier (for example, "ACI 12") in the "Map Relationship Storage Unit". "Mapping relation table" (as in Table 1), get the corresponding line bundle port identifier (for example get "A") and / or the corresponding MAC address (for example get "MAC 1"), the physical port in the L2C message (or The logical port) identifier "ACI 12" is converted to the corresponding line bundle port identifier "A"; optionally, the destination MAC address of the Layer 2 frame carrying the converted L2C message is set according to "MAC 1" and then forwarded.

In the downstream direction, the "Line Bundling Mapping Unit" is from BRAS/BNG! ^2 message, query the "mapping table" in the "relational relationship storage unit" (such as Table 1) according to the line bundle port identifier (for example, "B"), and get a corresponding set of physical ports (or logic) Port) identification (eg get "ACI 21", "ACI 22", "ACI 23") and / or the corresponding MAC address (eg get "MAC 21", "MAC 22", "MAC 23"), then one The L2C message with the line bundle port identifier "B" is converted into a group (three in this example) with L2C messages with physical port (or logical port) identification "ACI 21", "ACI 22", "ACI 23" respectively. Optionally, the destination MAC address of the Layer 2 frame carrying the converted L2C message is set according to "MAC 21", "MAC 22", "MAC 23", and then forwarded.

Table 1

(2) For DHCP messages:

In the upstream direction, the "line bundle mapping unit" pairs the DHCP message from the AN, according to its options.

The physical port (or logical port) identifier carried in (Option) (that is, the "Circuit ID circuit number" field in Option 82, in this case, "ACI 23") is queried for "mapping in the mapping relationship storage unit". Relationship table" (as in Table 1), get the corresponding line bundle port identifier (for example get "B") and / or the corresponding MAC address (for example get "MAC 2"), the physical port (or logic in the DHCP message Option) Port) The identifier "ACI 23" is converted to the corresponding line bundle port identifier "B"; optionally, the destination MAC address of the Layer 2 frame carrying the converted L2C message is set to "MAC 2" and then forwarded. In the above process, the giaddr (transfer proxy IP address) field in the DHCP message Option may be set according to the IP address of the L2C proxy, that is, the IP address of the L2C proxy may be written into the DHCP message, and then the forwarding operation is performed. .

(3) For PPPoE (Ethernet Bearup Point-to-Point Protocol) messages:

In the uplink direction, the line binding mapping unit identifies the PPPoE packet with the label (TAG) from the AN according to the physical port (or logical port) carried in the TAG (that is, the access loop identifier carried in the TAG). The domain access loop id, in this case "ACI 11") queries the "mapping table" in the "relational relationship storage unit" (as in Table 1), and obtains the corresponding line bundle port (for example, "A") and/or Corresponding MAC address (for example, "MAC 1"), converting the physical port (or logical port) identifier "ACI 11" in the PPPoE message TAG to the corresponding line bundle port identifier; optionally, carrying the converted L2C message The destination MAC address of the Layer 2 frame is set to "MAC 1" and then forwarded. Optionally, the address option "A," in the message may also be set according to the address of the entity performing the conversion process.

The line bundle provided by the present invention may be a line bundling relationship across an AN or across a circuit board, and may not only be bundled for multiple different physical ports (or logical ports) on the same circuit board in the same AN, but also may be cross- The AN is bundled with multiple different physical ports (or logical ports) across the board; it can ensure that changes in the physical port (or logical port) or line binding relationship do not affect the service process of the carrier device, and can also ensure line bonding. Changes in relationships do not affect the access device.

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 the invention should be determined by the scope of the claims.

Claims

Rights request

A layer 2 control L2C proxy method, characterized in that the method comprises:

The L2C proxy obtains the line port information or the line bundle port information in the received message; the L2C proxy according to the line bundle mapping relationship between the stored line port information and the line bundle port information, in the packet The line port information is converted into line bundle port information, or the line bundle port information in the message is converted into line port information.

The Layer 2 control L2C proxy method according to claim 1, wherein the line bundle mapping relationship is pre-configured in the L2C proxy.

The Layer 2 control L2C proxy method according to claim 1, wherein the line bundle mapping relationship comprises:

a multi-to-one mapping relationship between the line port information and the line bundle port information; or a one-to-many mapping relationship between the line bundle port information and the line port information.

The L2C proxy method according to claim 1, wherein the packet includes a control packet or a data packet, and the control packet includes a Layer 2 control protocol L2CP packet or authentication, authorization, and accounting. AAA packet, the data packet includes a dynamic host configuration protocol (DHCP) or an Ethernet bearer peer-to-peer protocol (PPPoE) packet.

The L2C proxy method according to claim 1, wherein the line port information includes a physical port identifier or a logical port identifier and/or a corresponding MAC address; and the line bundle port information includes a line bundle port identifier and / or the corresponding MAC address.

6. A Layer 2 control L2C proxy device, comprising: a message receiving unit, a line bundling mapping unit, and a message sending unit, wherein

The message receiving unit is configured to receive a message;

The message sending unit is configured to send the packet processed by the line bundling mapping unit.

The layer 2 control L2C proxy device according to claim 6, wherein the line bundle mapping unit comprises: a mapping relationship storage unit, configured to store line bundle mapping relationship information between the line port and the line bundle port;

a mapping conversion processing unit, configured to perform conversion processing on line port information or line bundle port information of the received message in the packet receiving unit according to the mapping relationship information saved in the mapping relationship storage unit, and convert the conversion The processed message is sent to the message sending unit.

A communication system, comprising: a first device, a second device, and a layer 2 control L2C proxy device, wherein:

The first device is configured to send a packet that includes line port information or a packet that includes line bundle port information;

The L2C proxy device is configured to receive a packet sent by the first device, and convert the line port information in the packet into a line bundle port information according to the stored line bundle mapping relationship, or send the packet The line bundle port information in the message is converted into line port information and sent;

The second device is configured to receive a message that has been converted by the L2C proxy device.

9. The communication system according to claim 8, wherein the first device comprises an access node AN, and the second device comprises a broadband access server BRAS or a broadband network gateway BNG or a network service provider ISP device. Or the second device comprises an access network AN, the first device comprising a BRAS or BNG or ISP device.

10. The communication system according to claim 8, wherein the L2C proxy device is separately provided or integrated in the first device or the second device.

11. The communication system according to claim 8, wherein the first device is a remote end

AN, the L2C proxy device is integrated inside the AN, and the second device is a BRAS or BNG or ISP device.

The communication system according to any one of claims 8 to 11, wherein the system further comprises an interconnection function unit between the L2C proxy device and the second device, and the interconnection function unit passes through layer 2 The control message transmits information of interaction between the L2C proxy device and the second device.