CN109495370B

CN109495370B - Message transmission method and device based on VPLS

Info

Publication number: CN109495370B
Application number: CN201811638861.7A
Authority: CN
Inventors: 郭瑞; 乔强国
Original assignee: Raisecom Technology Co Ltd
Current assignee: Beijing Shenlan Xuntong Technology Co ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2020-11-24
Anticipated expiration: 2038-12-29
Also published as: CN109495370A

Abstract

The invention discloses a message transmission method based on VPLS, which is applied to the local side equipment of the VPLS network and comprises the following steps: when receiving a monitoring message from user equipment in the MPLS forwarding domain, determining a VFI number of the message according to the relationship between the VFI number in a VFI and a virtual link PW of a subinterface at the NNI side of a network interface, determining a corresponding subinterface of the VFI number in the VLAN forwarding domain according to the corresponding relationship between the VFI number and the subinterface identification, and forwarding the VFI number in the VLAN forwarding domain; when the VLAN forwarding domain receives the monitoring message from the management interface, determining a PW for bearing the monitoring message according to the corresponding relation between the subinterface identification forwarded by the message in the VLAN forwarding domain and the VFI number in the MPLS domain and the corresponding relation between the subinterface PW corresponding to the VFI number, and forwarding. The scheme of the invention can solve the problem of how to increase the management capability of the user equipment by using limited resources.

Description

Message transmission method and device based on VPLS

Technical Field

The present invention relates to the field of network communication, and in particular, to a method and an apparatus for packet transmission based on a Virtual Private LAN Service (VPLS).

Background

With the development of society, the network service types and bandwidth requirements are increasing, the requirements on devices are increasing, especially the requirements on large bandwidth and low delay are becoming more prominent, and compared with TDM (Time-Division Multiplexing) devices, packet devices have greatly improved bandwidth supply capability and delay, and the advantages are gradually appearing. At present, the trend of using packet network to carry by large client services and government and enterprise services is gradually clear, the performance requirement of packet equipment is improved very quickly, the required service indexes are obviously differentiated for different grades of services, the index requirement of high-grade services on channels is gradually improved, the requirements of time delay, packet loss rate and the like are very clear, and especially in the 5G era, the requirements of meeting large bandwidth and low time delay are clearly provided. The dedicated line channel provides security and fast forwarding capability for high-level services, opens a PW (Pseudo Wire, virtual link) end to end, and puts services directly into the PW channel to transmit, which becomes the trend of dedicated line services.

The VPLS technology provides a complete Private Network solution for operators, which combines the advantages of ethernet technology and MPLS technology, is developed on the basis of a through MPLS L2VPN (Layer 2Virtual Private Network), and can implement a point-to-multipoint VPN (Virtual Private Network) networking, and the VPLS implements a technology for providing LAN services across a wide Area Network by using MPLS (Multiprotocol Label switching).

Disclosure of Invention

In order to solve the technical problem, the invention provides a message transmission method and a message transmission device based on a VPLS, which can increase the management capability of user equipment by using limited resources.

In order to achieve the purpose of the present invention, the present invention provides a message transmission method based on a VPLS, which is applied to a local side device of a VPLS network, and the device comprises: a multiprotocol label switching, MPLS, forwarding domain and a virtual local area network, VLAN, forwarding domain, the method comprising:

when receiving a monitoring message from user equipment in the MPLS forwarding domain, determining a VFI number of the message according to the relationship between the VFI number in a VFI and a virtual link PW of a subinterface at the NNI side of a network interface, determining a corresponding subinterface of the VFI number in the VLAN forwarding domain according to the corresponding relationship between the VFI number and the subinterface identification, and forwarding the VFI number in the VLAN forwarding domain; wherein, the correspondence between the VFI number and the subinterface identification is established in advance; the VFI number is determined at the time of creation of a VFI including: the corresponding relation between the VFI serial number and the NNI side subinterface PW of the network interface;

when the VLAN forwarding domain receives a monitoring message from a management interface, determining a PW for bearing the monitoring message according to the corresponding relation between the subinterface identification forwarded by the message in the VLAN forwarding domain and the VFI number in the MPLS domain and the corresponding relation between the subinterface PW corresponding to the VFI number, and forwarding;

the monitoring message includes: management messages and/or monitoring messages.

In an exemplary embodiment, the receiving, in the MPLS forwarding domain, the monitoring packet from the user equipment includes:

in the MPLS forwarding domain, after receiving the message from the virtual link PW, filtering the message to obtain the monitoring message to be forwarded to the VLAN forwarding domain.

In an exemplary embodiment, the MPLS forwarding domain receives and sends the monitoring packet through a first port; the VLAN forwarding domain receives and sends the monitoring message through a second port; the method further comprises the following steps:

and processing the message forwarded between the first port and the second port according to a preset rule.

In an exemplary embodiment, the method further comprises:

when receiving a monitoring message from a user equipment in the MPLS forwarding domain, the processing the monitoring message according to a preset rule includes:

when the monitoring message is a Dynamic Host Configuration Protocol (DHCP) message from user equipment, copying the information of a Chaddr field in the monitoring message to an inner-layer source MAC address field;

and when the DHCP message is encapsulated in the user equipment, the inner layer source MAC address is set as a specific value.

In an exemplary embodiment, the sub-interface identification in the VLAN forwarding domain comprises: STAG + CTAG, wherein the STAG is identified as an outer layer VLAG TAG distributed to a user by an operator, and the CTAG is identified as an inner layer VLAN TAG distributed to a user private network.

In an exemplary embodiment, forwarding in the VLAN forwarding domain is performed according to the MAC address of the packet.

In order to solve the above problem, the present invention further provides a VPLS-based message transmission apparatus, which is applied to a local side device of a VPLS network, and the apparatus includes: a multiprotocol label switching MPLS forwarding module and a virtual local area network VLAN forwarding module;

the MPLS forwarding module is used for determining a VFI number of a monitoring message according to the relationship between the VFI number in a VFI of a virtual forwarding instance and a sub-interface PW at the NNI side of a network interface when the monitoring message from user equipment is received, determining a corresponding sub-interface of the monitoring message in the VLAN forwarding domain according to the corresponding relationship between the VFI number and the sub-interface identifier, and forwarding the monitoring message in the VLAN forwarding domain; wherein, the correspondence between the VFI number and the subinterface identification is established in advance; the VFI number is determined at the time of creation of a VFI including: the corresponding relation between the VFI serial number and the NNI side subinterface PW of the network interface;

the VLAN forwarding module is used for determining a PW for bearing the monitoring message according to the corresponding relation between the subinterface identification forwarded by the message in the VLAN forwarding domain and the VFI number in the MPLS domain and the corresponding relation between the subinterface PW corresponding to the VFI number and forwarding the monitoring message when receiving the monitoring message from an access point;

In an exemplary embodiment, the MPLS forwarding module, configured to receive a monitoring packet from a user equipment, includes:

In an exemplary embodiment, the MPLS forwarding domain receives and sends the monitoring packet through a first port; the VLAN forwarding domain receives and sends the monitoring message through a second port; the device further comprises: a processor;

the processor is arranged between the first port and the second port and is used for processing the message forwarded between the first port and the second port according to a preset rule.

In an exemplary embodiment, the MPLS forwarding module is further configured to, when receiving a monitoring packet from a user equipment in the MPLS forwarding domain, process the monitoring packet according to a preset rule, where the processing includes:

Compared with the prior art, the invention comprises a message transmission method based on VPLS, which is applied to the local side equipment of the VPLS network, and the equipment comprises: a multiprotocol label switching, MPLS, forwarding domain and a virtual local area network, VLAN, forwarding domain, the method comprising: when receiving a monitoring message from user equipment in the MPLS forwarding domain, determining a VFI number of the message according to the relationship between the VFI number in a VFI and a sub-interface PW at the NNI side of a network interface, determining a corresponding sub-interface of the message in the VLAN forwarding domain according to the corresponding relationship between the VFI number and a sub-interface identifier, and forwarding in the VLAN forwarding domain; wherein, the correspondence between the VFI number and the subinterface identification is established in advance; the VFI number is determined at the time of creation of a VFI including: the corresponding relation between the VFI serial number and the NNI side subinterface PW of the network interface; when the VLAN forwarding domain receives a monitoring message from an access point, determining a PW for bearing the monitoring message according to the corresponding relation between the subinterface identifier forwarded by the message in the VLAN forwarding domain and the VFI number in the MPLS domain and the corresponding relation between the subinterface PW corresponding to the VFI number, and forwarding; the monitoring message includes: management messages and/or monitoring messages. The scheme of the invention can utilize limited resources to increase the management capability of the user equipment.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a schematic block diagram of a local side device in a VPLS network according to an embodiment of the present invention;

fig. 2 is a flowchart of a VPLS-based message transmission method according to an example one of the present invention;

fig. 3 is a flowchart of a VPLS-based message transmission method according to example two of the present invention;

fig. 4 is a schematic block diagram of a VPLS-based message transmission apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

In the technical scheme of the embodiment of the invention, a simple introduction is made to a plurality of components of the VPLS network:

ac (attachment circuit): the access circuit is used for connecting a user and a service Provider, namely, a link for connecting user Edge network equipment (customer Edge, CE) and Provider Edge network equipment (PE), and a corresponding interface can only be an ethernet interface.

Pw (pseudo wire): virtual link, a bidirectional Virtual connection between Virtual Switch Instances (VSIs) on two PE devices. It consists of a pair of unidirectional MPLS VCs (Virtual circuits) in opposite directions. The establishment of the PW is to exchange MPLS inner layer labels (namely VC labels VC IDs) of a VPLS domain between two local side devices (PE), wherein the VC IDs and MPLS outer layer labels forming a label switching path LSP jointly form the PW;

tunnel: and the tunnel is used for bearing the PWs, and one tunnel can bear a plurality of PWs. The tunnel is a direct connection channel between the local PE and the opposite end PE, completes the transparent data transmission between the PEs, and can be an MPLS or generic routing encapsulation GRE tunnel and the like;

PW Signaling: PW signaling protocol, the basis for VPLS implementation, is used to create and maintain PWs. The PW signaling protocol may also be used to automatically discover the opposite end PE devices of the VSI. At present, the PW signaling protocol mainly includes a label distribution protocol LDP and a border gateway protocol BGP.

VFI (virtual Forward instance): virtual forwarding instance, a VPLS is created on PE, VPLS instances of the same VC ID on different PEs belong to a VPLS domain, and can communicate with each other, and VFI executes MAC learning and MAC exchange.

The message transmission method based on the VPLS of the embodiment of the invention is applied to the local side equipment of the VPLS network, and comprises the following steps:

step 100, when receiving a monitoring message from a user equipment in the MPLS forwarding domain, determining a VFI number of the message according to a relationship between the VFI number in a VFI and a sub-interface PW on a network interface NNI side, determining a corresponding sub-interface of the message in the VLAN forwarding domain according to a correspondence between the VFI number and a sub-interface identifier, and forwarding the message in the VLAN forwarding domain; wherein, the correspondence between the VFI number and the subinterface identification is established in advance; the VFI number is determined at the time of creation of a VFI including: and the correspondence between the VFI serial number and the NNI side subinterface PW.

In this embodiment, the correspondence between the VFI number and the subinterface identifier is pre-established; for example: when creating a VPLS forwarding service, creating a sub-interface of a second port in the VLAN forwarding domain and a sub-interface identifier (STAG + CTAG) thereof, a User Network Interface (UNI) side sub-interface AC and an Access Control List (ACL) in the VLAN forwarding domain (for example, through a configuration interface), wherein the STAG identifier is an outer layer VLAG TAG allocated to a user by an operator, and the CTAG identifier is an inner layer VLAN TAG allocated to a private network of the user; also created in the MPLS domain is a VFI comprising: the method comprises the steps of establishing a corresponding relation between a VFI number, a user network interface UNI side sub-interface AC and a network-to-network interface NNI side sub-interface PW, establishing a corresponding relation between the VFI number and a corresponding sub-interface identification STAG in a VLAN forwarding domain, wherein the configured VFI number, the corresponding sub-interface identification STAG and the corresponding relation can be realized through a configuration interface, and when the VFI number is determined, the corresponding relation between the VFI and the sub-interface is determined. For example, the number value of the VFI is configured to be 3, and the sub-interface identifier STAG corresponding to the VFI number value is 1258, so that as long as a message with the sub-interface identifier STAG of 1258 is received in the subsequent office equipment, it can be determined that the source is the VFI with the number value of 3.

In other embodiments, different VPLS forwarding traffic may be distinguished in other ways as well.

Step 101, when the VLAN forwarding domain receives a monitoring message from a management interface, determining a PW for carrying the monitoring message according to a correspondence between a subinterface identifier forwarded by the message in the VLAN forwarding domain and a VFI number in the MPLS domain, and a correspondence between a subinterface PW corresponding to the VFI number, and forwarding the PW;

The receiving of the monitoring message from the user equipment in the MPLS forwarding domain includes:

In an exemplary embodiment, the method further comprises:

In an exemplary embodiment, the local device is typically a PE (Provider Edge). As shown in fig. 1, includes: a forwarding module and a processor, wherein:

the forwarding module is configured to perform data interaction with a management end on an ethernet side and perform data interaction with a user equipment on an MPLS side, where:

the forwarding module is provided with an MPLS forwarding domain, usually, one central office device is provided with only one MPLS forwarding domain for data forwarding, and as in the prior art, there are many routers adjacent to each other in the MPLS forwarding domain, all the routers are LSRs (Label Switching routers) supporting MPLS technology, and are used for implementing connection between an AC and a PW in the MPLS forwarding domain, and the encapsulation and transmission process of each data protocol between the routers in the MPLS forwarding domain is implemented by using the prior art in the art, which is not described herein again. A first port for data interaction with the processor is arranged on the MPLS forwarding domain; the first port may be a physical port or an aggregation port according to networking conditions.

On the forwarding module, a VLAN forwarding domain is further set according to an actual networking situation, and is used to implement interaction between management packets from different PW channels and a management access point, where the management access point may be: a CPU access point of the local side equipment or a side hanging access point of the side hanging equipment; the selection of which type of access point to use as the management access point is determined by those skilled in the art according to the actual networking needs and is pre-configured. Two types of physical ports are arranged on the VLAN forwarding domain: (1) performing data interaction with the processor, and further accessing to a second port of the MPLS forwarding domain, wherein the second port can be a physical port or an aggregation port according to networking conditions; (2) management ports connected to management end access points, for example: the management interface may be a CPU access point (provided on the local side device) or a side hook access point (connected to the side hook device) shown in fig. 1; it is stated herein that the VLAN forwarding domains may be one or more, but all VLAN forwarding domains are provided with only one second port, and each of the second ports is distinguished using a specific sub-interface identification.

The processor may be implemented by a CPU (Central Processing Unit), an FPGA (Field-Programmable Gate Array), or a coprocessor (coprocessor), and is disposed between the MPLS forwarding domain and the VLAN forwarding domain, and configured to modify (e.g., add a timestamp, etc.) and forward a received packet according to a preset rule; on which a first forwarding port is provided which is physically connected to a first port of the MPLS forwarding domain, and a second forwarding port is provided which is physically connected to a second port of the VLAN forwarding domain.

Based on the above structure, when initialization is performed on the local side equipment, a plurality of VLAN forwarding domains are preset, and the VLAN forwarding domains are provided with different sub-interface identifiers (STAG + CTAG) for identifying VPLS forwarding services of different access sub-interfaces, for example, the VLAN forwarding domains set STAG to 1256-1511 for identifying access VPLS forwarding services, and identify that a plurality of VLAN forwarding domains can support 256 VFIs at most. That is to say, after the local side device is started, an optional sub-interface identifier for VPLS service forwarding in the VLAN forwarding domain is created in advance, and is used for subsequently managing and testing the user equipment accessed by the VPLS.

For example, when creating a VPLS forwarding service, a subinterface of a second port in the VLAN forwarding domain and its subinterface identification (STAG + CTAG), a user network interface UNI-side subinterface AC, and an access control list ACL are created in the VLAN forwarding domain (e.g., via a configuration interface), where STAG is an outer-layer VLAG TAG assigned to a user by an operator, and CTAG is an inner-layer VLAN TAG assigned to a user's private network; also created in the MPLS domain is a VFI comprising: the corresponding relation of VFI number, user network interface UNI side sub-interface AC and network-to-network interface NNI side sub-interface PW is established, the corresponding relation of VFI number and STAG in the corresponding sub-interface identification in the VLAN forwarding domain is established, the configured VFI number, STAG in the corresponding sub-interface identification and the corresponding relation of the STAG can be realized through a configuration interface, and after the VFI number is determined, the corresponding relation of VFI and sub-interface is determined. For example, the number value of the VFI is configured to be 3, and the sub-interface identifier STAG corresponding to the VFI number value is 1258, so that as long as a message with the sub-interface identifier STAG of 1258 is received in the subsequent office equipment, it can be determined that the source is the VFI with the number value of 3, and the value of the CTAG is configured when the message is configured, and is automatically carried when the message is generated.

Two examples are further illustrated below.

Example 1

After the above configuration is completed by the office device, the method for monitoring and processing the uplink data traffic entering the office device from the PW channel, as shown in fig. 2, includes:

s10, the service message, the management message and the monitoring message are loaded to the local side device through the PW channel and enter the MPLS forwarding domain; fig. 2 shows a data flow direction of a PW channel carrying an uplink packet;

in this step, as in the prior art, on the local side device, the VFI performs MAC learning and MAC switching, and when the PW channel is established, the MPLS inner label that identifies the VPLS domain, i.e., VC label (VC ID), has been switched between the two local side devices, and the VC ID and the MPLS outer label that constitutes the label switched path LSP together constitute the PW channel.

S11, terminating the MPLS outer label in the MPLS forwarding domain, filtering the management message and the monitoring message, and sending to the first port; fig. 2 shows two data flow directions of the management packet and the monitoring packet forwarded to the first port in the MPLS forwarding domain, respectively, and what manner may be adopted may be determined according to an actual network condition, which is not limited herein; however, the service packet is forwarded according to the prior art, which is not described in this application, and is not shown in fig. 2.

In this step, the management packet and the monitoring packet may be filtered on the PW side or may be forwarded to the AC side, and any manner may be implemented by a known manner in the prior art, for example, filtering is implemented by an Access Control List (ACL) or MAC address query in a Virtual Forwarding Instance (VFI);

in this step, sending the management packet and the monitoring packet to the first port may also be implemented by redirecting the filtered data stream in a manner in the prior art.

S12, after receiving the management message and the monitoring message, the first port acquires the VFI number, adds the sub-interface identifier STAG in the message according to the correspondence between the VFI number and the STAG in the sub-interface identifier, and forwards the sub-interface identifier STAG to the processor; (the data flow direction of the management message and the monitoring message is shown in the figure 2).

In this step, since only the management packet and the monitoring packet input through the PW channel are forwarded to the first port, the first port may set the first forwarding port address of the processor as a destination address, and when receiving the management packet and the monitoring packet, forward the received management packet and monitoring packet to the processor according to the destination address.

In this step, the sub-interface identification STAG may be carried with a specific field of the message in the MPLS forwarding domain, e.g. using the outer VLAN TAG field to carry STAG information when using Q-in-Q format messages.

S13, the processor receives the management message and the monitoring message from the first port, and sends the management message and the monitoring message to the second port of the VLAN forwarding domain through the second forwarding port; thus, the message is forwarded to the VLAN forwarding domain; the data flow of the management message and the monitoring message is shown in fig. 2.

In this step, the processor modifies (e.g., adds a timestamp, etc.) and forwards the received message according to a preset rule, and the specific modification is settable by a person of ordinary skill in the art according to an actual application scenario, which is not limited herein nor elaborated on a specific modification process.

And S14, forwarding the management message and the monitoring message to the CPU access point or the side-hanging access point in the VLAN forwarding domain according to the acquired subinterface identifier (STAG + CTAG) and the MAC address.

In this step, one sub-interface identifier (STAG + CTAG) corresponds to one VPLS forwarding service, and forwarding the service packet according to the MAC address forwarding is specifically: forwarding is performed in a manner of a MAC address forwarding table in the prior art, wherein the MAC address in the VLAN forwarding domain is learned and aged according to a method in the prior art, which is not described herein again.

Therefore, in the method shown in fig. 2, on one hand, the separation of the management packet, the monitoring packet and the service packet is completed in the MPLS forwarding domain inside the local side device, and the user has no perception and good experience; on the other hand, in the above method, in the VLAN forwarding domain, one MAC address represents one user equipment accessed by the PW channel, while one VFI corresponds to one VLAN, and at the second port, one VLAN corresponds to one STAG, and the sub-interfaces therein are distinguished by CTAG, whereby the VLAN forwarding domain forms a plurality of sub-interfaces, thereby forming 1: n forwarding VLAN; in a third aspect, in the above method, a level 2 lever is formed by forwarding in two dimensions (MPLS forwarding domain and VLAN forwarding domain), and the access traffic of the remote device is managed and detected.

A monitoring processing method of uplink data traffic is described below by taking a processing flow of management data when the user equipment is online as a further example, where the management packet is a DHCP (Dynamic Host Configuration Protocol) packet, and the following is specifically described below:

s100, when the user equipment is on line, the DHCP discovery (Discover) message is loaded to the local side equipment through a PW channel and enters an MPLS forwarding domain;

in this step, when the user equipment is online, the sending of the DHCP Discover message is automatically triggered, and when the message is encapsulated, an outer source MAC address therein is set to a fixed preset value MAC1 (e.g., 0x000e5e 000001); the specific message format is shown in table 1 below:

wherein the content of the first and second substances,

0x 8847: identifying the message type as MPLS;

DMAC: a destination MAC address;

SMAC: a source MAC address;

LSP Lable: an LSP label;

PW Lable: PW label;

DMAC-inner: an inner layer destination MAC address;

SMAC-inner: an inner layer source MAC address; when the DHCP message is set to a fixed value, for example: fixed set to MAC 1;

0x 0800: the identification message uses a two-layer network protocol.

Table 1DHCP Discover message

S101, firstly terminating an MPLS external label in an MPLS forwarding domain, filtering a source MAC Address (MAC) 1 to obtain a DHCP Discover message by using an ACL filtering mode, and sending the message to a first port;

in the above step S100, the purpose of setting the inner-layer source MAC address (inner-MAC) of the DHCP Discover message to a certain value is to easily filter out the DHCP Discover message by filtering the field value in S101; actually, in other schemes, such setting may not be performed, and the DHCP Discover message is filled according to the real MAC address, but at this time, the DHCP Discover message is sent to the first port in the MPLS forwarding domain, because the DHCP Discover message in the service message and the DHCP Discover message in the management message carried in one PW channel cannot be directly distinguished in the office device, and the processing rules such as filtering and the like thereof are complex;

s102, after receiving the data, the first port acquires the VFI number, adds the sub-interface identifier (STAG) in the message according to the corresponding relation between the VFI number and the STAG, and forwards the sub-interface identifier (STAG) to the processor.

S103, after receiving a DHCP Discover message from a first port, when judging that an inner layer source MAC address is MAC1, a processor copies a Chaddr field of the DHCP Discover message to the inner layer source MAC field, so that the real source MAC address replaces MAC1, and the DHCP Discover message is forwarded by a second port of a VLAN forwarding domain to enter a VLAN forwarding domain of a local side;

in this step, the processing of subsequent data is not affected for modifying the inner layer source MAC address of the message to a real MAC address.

S104, when the DHCP Discover message carrying the true source MAC address in the external source MAC field enters a VLAN forwarding domain, the true MAC address of the user equipment sending the message is obtained, MAC address learning is carried out and is recorded in an MAC address forwarding table, the MAC address learning mentioned here is realized by adopting a mode in the prior art, and a basis is provided for the forwarding of the subsequent downlink message according to the MAC address.

S105, sending a DHCP Discover message to a DHCP server from a management interface connected with a CPU access point or a management interface connected with a side-hanging access point; the DHCP server allocates an IP address to the user equipment according to the technical scheme in the prior art.

In the step, whether the message is sent from the CPU interface or the side-hung interface is determined according to the configuration of the user, if the user uses the side-hung interface for detection, the side-hung interface is added into the corresponding VLAN forwarding domain, and if the detection is carried out by the local CPU, the CPU interface is added into the VLAN forwarding domain.

The format of the DHCP message is as follows: the format of 8 messages of the DHCP service is the same, and the messages of different types only have different values of some fields in the messages. DHCP format is based on the BOOTP message format, and the following table is a description of each field.

Table 2DHCP message format

Example two

As for the office device that completes the configuration, the method for processing the downlink data traffic, as shown in fig. 3, includes:

step S20, the monitoring message (including the management message and the monitoring message) enters into the VLAN forwarding domain from the CPU access point or the side-hanging access point, and is forwarded to the second interface in the VLAN forwarding domain; fig. 3 shows a data flow direction of the monitoring packet;

in this step, all the management messages and monitoring messages entered from the management interface acquire the PW, used for carrying the monitoring message, of the forwarding message in the local side device in the VLAN forwarding domain according to the information in the previously learned MAC address table, and first forward the PW to the second port.

Step S21, the second port transmits the received data of the transmission message to the processor; fig. 3 illustrates the data flow of the management message and the monitoring message.

Step S22, after receiving the management packet and the monitoring packet from the second port, the second forwarding port of the processor performs corresponding processing (the processing is determined according to a conventional method for processing the packet in the prior art, for example, according to different management types and monitoring types, which is not limited herein, for example, adding a timestamp), and then forwards the management packet and the monitoring packet to the first port of the MPLS forwarding domain; of course, in some embodiments, the processor may also directly forward without any processing, and fig. 3 shows the data flow direction of the management packet and the monitoring packet.

Step S23, extracting data information at the first port of the MPLS forwarding domain, because the service packet already carries the sub-interface identifier STAG + CTAG, determining the VFI number where the packet is output according to the sub-interface identifier STAG carried by the service packet, and forwarding according to the MAC address table and the destination MAC address on the VFI, so as to enter the PW carrying the service packet and send the PW to the user equipment through the PW channel, where the data flow direction of the management packet and the monitoring packet is shown in fig. 3.

In this step, since the connection relation has already been established in the system configuration process, the data information in the packet is extracted according to the method in the prior art, and the specific process of extraction is not repeated.

The monitoring processing method of downlink data traffic is described as a further example by using a monitoring processing flow of a test message for performing bidirectional active measurement protocol TWAMP or IP monitoring to an online user equipment (a local side equipment or a side-hanging equipment already knows an IP address, an MAC address, and other information of the user equipment), specifically as follows:

step S200, a test packet (e.g., ping packet) received through the management interface is searched in the VLAN forwarding domain according to the MAC forwarding table, and an egress port is determined as an egress port of the local side device (where the egress port is a logical egress port determined according to the sub-interface identifier STAG), and then forwarded to the second port.

In this step, the MAC forwarding table is generated for the previous MAC address learning.

In this step, the message whose port has been determined is forwarded to the second port, which is a process that can be performed in the processing module.

Step S201, the test message is sent to the processor by the second port, and the processor can carry out necessary processing according to a preset strategy and then forward the test message to an MPLS forwarding domain;

in this step, the processing performed by the processor is preset, for example, adding a timestamp, and the like, which are all routine processing performed on the test packet by a person skilled in the art according to the forwarding requirement, and is not limited herein.

Step S202, extracting data information at the first port of MPLS forwarding domain, because the test message carries sub-interface mark STAG + CTAG, determining the VFI number when the message is output according to the sub-interface mark STAG carried by the test message, then forwarding according to the MAC address table and the target MAC address on the VFI, thereby entering the PW for bearing the service message, and sending to the remote device through the PW channel,

step S203, after receiving the service packet through the PW channel, the ue sends the service packet to the CPU of the ue according to the prior art, the CPU of the ue sends a response packet, and sends the response packet to the office device through the corresponding PW channel, and the response packet serving as a management packet in the office device is forwarded according to the above-mentioned monitoring and processing method for uplink data traffic until reaching a test server (which may be the office device itself or a side-hung device) connected by an external access point, and the test server performs related performance calculations such as delay and jitter.

The above method shows that: in this embodiment, by introducing the VLAN forwarding domain, which is equivalent to adding a first-level forwarding lever, not only a first-level lever may exist in the MPLS forwarding domain, but also a first-level lever may exist in the VLAN forwarding domain by using the following formula 1: in the forwarding strategy of N, one subinterface identifier (STAG + CTAG) corresponds to one VPLS forwarding service, so that one physical interface of the management server or the monitoring server can manage more user equipment, and the requirement on performance configuration of the management server or the monitoring server is reduced. If the VLAN forwarding domain does not exist, a plurality of physical subinterfaces must be configured on the management server or the monitoring server to complete management and monitoring, and not only is the configuration process responsible, but also the hardware cost is increased. In addition, in this example, a processor formed by, for example, a CPU, an FPGA, or a coprocessor is added, so that the capability of compiling and modifying a data packet according to a predetermined policy in a forwarding process is improved, and the expansibility and flexibility of the entire system can also be improved.

The invention introduces VLAN forwarding domain and processing module, and incorporates management message and monitoring message into data forwarding domain, so that the device has the capability of managing user and monitoring service through PW.

The invention introduces VLAN forwarding domain, which is equivalent to adding a first-level forwarding lever, so that a physical interface of a management server or a monitoring server can manage and monitor a large amount of remote equipment, and the configuration of the management server and the monitoring server is simplified.

The invention provides the online flow and the monitoring flow, so that the monitoring of the IP and the TWAMP on the PW is more convenient and fast, and the configuration can be completely avoided. By modifying the DHCP flow, the remote device can acquire the IP address through the PW pipeline, and can clearly filter out the IP address request information of the remote PW pipeline on the local device.

The invention facilitates the access of the monitoring server by entering the VLAN forwarding domain and defining the management interface.

In addition, the present application provides an embodiment of a message transmission apparatus based on VPLS, which may be specifically applied to an office device of a VPLS network.

As shown in fig. 4, the VPLS-based packet transmission apparatus is applied to an office device of a VPLS network, and the apparatus includes: a multiprotocol label switching MPLS forwarding module and a virtual local area network VLAN forwarding module;

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.

Claims

1. A message transmission method based on VPLS is applied to the local side equipment of VPLS network, which is characterized in that the equipment comprises: a multiprotocol label switching, MPLS, forwarding domain and a virtual local area network, VLAN, forwarding domain, the method comprising:

2. The VPLS-based message transmission method according to claim 1, wherein receiving the monitoring message from the user equipment in the MPLS forwarding domain comprises:

3. The VPLS-based message transmission method according to claim 1, wherein the MPLS forwarding domain receives and sends the monitoring message through a first port; the VLAN forwarding domain receives and sends the monitoring message through a second port; the method further comprises the following steps:

4. The VPLS-based messaging method of claim 3, further comprising:

5. The VPLS-based messaging method of claim 1, wherein the subinterface identification in the VLAN forwarding domain comprises: STAG + CTAG, wherein the STAG is identified as an outer layer VLAG TAG distributed to a user by an operator, and the CTAG is identified as an inner layer VLAN TAG distributed to a user private network.

6. The VPLS-based message transmission method according to claim 1, wherein forwarding in the VLAN forwarding domain is according to a MAC address of the message.

7. A message transmission device based on VPLS is characterized in that the device is applied to the local side equipment of the VPLS network, and the device comprises: a multiprotocol label switching MPLS forwarding module and a virtual local area network VLAN forwarding module;

the MPLS forwarding module is used for determining a VFI number of a monitoring message according to the relationship between the VFI number in a VFI of a virtual forwarding instance and a virtual link PW of a subinterface at the NNI side of a network interface when the monitoring message from user equipment is received, determining a corresponding subinterface of the monitoring message in the VLAN forwarding domain according to the corresponding relationship between the VFI number and the subinterface identification, and forwarding the monitoring message in the VLAN forwarding domain; wherein, the correspondence between the VFI number and the subinterface identification is established in advance; the VFI number is determined at the time of creation of a VFI including: the corresponding relation between the VFI serial number and the NNI side subinterface PW of the network interface;

8. The VPLS-based messaging apparatus of claim 7,

the MPLS forwarding module is configured to receive a monitoring packet from a user equipment, and includes:

9. The VPLS-based messaging apparatus of claim 7,

the MPLS forwarding domain receives and sends the monitoring message through a first port; the VLAN forwarding domain receives and sends the monitoring message through a second port; the device further comprises: a processor;

10. The VPLS-based message transmission apparatus according to claim 9, wherein the MPLS forwarding module is further configured to, when receiving a monitoring message from a user equipment in the MPLS forwarding domain, process the monitoring message according to a preset rule, including:

11. The VPLS-based messaging appliance of claim 7, wherein the subinterface identification in the VLAN forwarding domain comprises: STAG + CTAG, wherein the STAG is identified as an outer layer VLAG TAG distributed to a user by an operator, and the CTAG is identified as an inner layer VLAN TAG distributed to a user private network.

12. The VPLS-based messaging apparatus of claim 7, wherein forwarding in the VLAN forwarding domain is according to a MAC address of the message.