WO2011120471A2

WO2011120471A2 - Method, network equipment and system for data transmission

Info

Publication number: WO2011120471A2
Application number: PCT/CN2011/073834
Authority: WO
Inventors: 何路友; 李俊安; 石悌君; 薛莉
Original assignee: 华为技术有限公司
Priority date: 2011-05-09
Filing date: 2011-05-09
Publication date: 2011-10-06
Also published as: CN102239681A; CN102239681B; WO2011120471A3

Abstract

The embodiments of the present invention provide a method, network equipment and system for data transmission, wherein the method includes: establishing an Label Switched Path (LSP) to a destination UNI-Client (C) equipment via a source User Network Interface (UNI)–Network (N)equipment and a destination UNI-N equipment; generating a data packet which is transmitted to the destination UNI-C equipment and carries a certain Media Access Control (MAC) address in the destination MAC address field; transmitting the data packet on the LSP, so as to enable the data packet to carry the MAC address which can be identified by the destination UNI-C equipment when the data packet is outputted from the destination UNI-N equipment. By carrying a certain MAC address in the destination MAC address field of the data packet, the source UNI-C equipment can encapsulate the data packet. As the data packet carries the MAC address which can be identified by the destination UNI-C equipment when the data packet outflows from the transmission network, the destination UNI-C equipment can identify the data packet, thereby achieving the communication between the UNI-C equipments. Therefore, the UNI-C equipment can use the transmission network to perform efficient data transmission, thus achieving the convergence of transmission network and data network.

Description

Method, network device and system for data transmission

The present invention relates to the field of network communications and, more particularly, to methods, network devices and systems for data transmission in the field of network communications. Background technique

In a traditional transport network, the establishment of services is statically specified. With the continuous development of the third generation of mobile communication, packet services, and broadband services, the uncertainty and unpredictability of services are gradually increasing, and higher requirements are imposed on network bandwidth. The traditional way of statically configuring services is increasingly unable to meet the requirements. The need for network applications has resulted in the Generalized Multi-Protocol Label Switching (GMPLS).

GMPLS can be considered to consist of three planes: the transport plane, the control plane, and the management plane. The control plane is mainly responsible for controlling the call connection of the network, and completes the dynamic control of the transport plane through signaling exchange; the management plane manages the transport plane, the control plane and the system as a whole, and realizes the coordination of functions; the transport plane is responsible for the transmission of services, but The switching action is performed under the influence of the management plane and the control plane. Compared with traditional optical networks, the most prominent feature of GMPLS is the introduction of independent control planes in the transport network. Compared with traditional routers, the most prominent feature of GMPLS is the introduction of transport networks in data networks. Faster, more bandwidth, and higher performance end-to-end services.

In the GMPLS network system, a User Network Interface (UNI) is defined. The UNI is the interface of the user equipment to the network, and provides a unified network access mode to the user equipment through the UNI. The user equipment needs to meet the UNI interface specification to access the transmission network under the GMPLS network system, thereby utilizing the huge transmission capacity of the transmission network. For example, for a device in a data communication network, such as a router, in order to utilize the huge transmission capacity of the transmission network, it needs to be connected to the transmission network, so that the UNI interface needs to be implemented. The UNI interface is a UNI-C (UNI-Client, UNI client side) device and a UNI-N (UNI-Network, UNI network side) device. The UNI-C device is a client-side device that wants to use the transmission network to transmit data. The UNI-N device is a transport network device at the entrance of the UNI-C device access transmission network.

In the related art, a UNI-C device in an IP (Internet Protocol) network can establish a label switching path with a UNI-C device at the opposite end via a transport network ( Label Switching) Path, LSP), such that the UNI-C device can utilize the transport network for efficient data transmission via the LSP.

However, at present, the GMPLS protocol focuses on establishing an end-to-end link-level transmission path. The UNI-C device in the data network cannot perform effective LSP even if it establishes an LSP with the UNI-C device in the peer data network. data communication. The reason is that the UNI-C device needs to encapsulate the data packet to send the data out, but the UNI-C device cannot know the media access control of the peer UNI-C device during the process of establishing the LSP with the peer UNI-C device. The Media Access Control (MAC) address, so that the UNI-C device cannot encapsulate the data packet, and the established LSP cannot be used. Even if the UNI-C device sends a packet, if the peer UNI-C device does not recognize the packet, communication between the two cannot be performed. Summary of the invention

Embodiments of the present invention provide a method, network device, and system for data transmission, such that

UNI-C equipment can use the transmission network for data transmission, so that the transmission network and the data network can be fused. The UNI-C equipment in the data network will not be able to communicate due to the introduction of the transmission network.

In one aspect, an embodiment of the present invention provides a method for data transmission, including: establishing an LSP with a destination UNI-N device and a destination UNI-N device with a destination UNI-C device; generating a transmission to a destination UNI-C device The data packet carrying the specific MAC address in the destination MAC address field; the data packet is sent on the LSP, so that the destination UNI-C device carries the UNI-C device in the destination MAC address field when the data packet is output from the destination UNI-N device. MAC address.

On the other hand, an embodiment of the present invention provides a method for data transmission, including: when receiving a data packet sent by a source UNI-C device to a destination UNI-C device on an LSP, deleting a transmission carried by the data packet a network label, where the LSP is an LSP established by the source UNI-C device and the destination UNI-C device via the source UNI-N device and the destination UNI-N device; when the destination MAC address field of the data packet does not carry the destination UNI-C device, the LSP is identifiable The MAC address of the packet is filled with the MAC address of the destination UNI-C device in the destination MAC address field of the packet; the packet carrying the MAC address of the destination UNI-C device is sent to the destination UNI-C device.

In a further aspect, the embodiment of the present invention provides a network device, including: an establishing module, configured to establish an LSP with a source UNI-N device and a destination UNI-N device with a destination UNI-C device; and generate a module, configured to generate a data packet that is sent to the destination UNI-C device and carries a specific MAC address in the destination MAC address field. The first sending module is configured to send a data packet on the LSP to enable the data. When the packet is output from the destination UNI-N device, the destination MAC address field carries the MAC address identifiable by the destination UNI-C device.

In another aspect, the embodiment of the present invention provides a network device, including: a deleting module, configured to: when receiving a data packet sent by a source UNI-C device to a destination UNI-C device on an LSP, deleting the data packet carrying a transport network label, where the LSP is an LSP established by the source UNI-C device and the destination UNI-C device via the source UNI-N device and the network device; a padding module, configured to: when the destination MAC address field of the data packet does not carry the destination UNI- The MAC address of the destination UNI-C device is filled in the destination MAC address field of the data packet, and the sending module is configured to send the data carrying the MAC address of the destination UNI-C device to the destination UNI-C device. package.

In another aspect, an embodiment of the present invention provides a system for data transmission, including a source user network interface client side UNI-C device, a source user network interface network side UNI-N device, a destination UNI-N device, and a source UNI. -C equipment. The source UNI-C device is configured to establish an LSP with the source UNI-N device and the destination UNI-N device with the destination UNI-C device, and generate a specific MAC address that is sent to the destination UNI-C device in the destination MAC address field. Packet; sends a packet on the LSP. The source UNI-N device is configured to receive a data packet sent by the source UNI-C device, and add a transport network label to the data packet. The destination UNI-N device is configured to: when receiving the data packet forwarded by the source UNI-N device, delete the transport network label; when the destination MAC address field of the data packet does not carry the MAC address identifiable by the destination UNI-C device, the data is in the data. The destination MAC address field of the packet is filled with the MAC address of the destination UNI-C device, and the data packet carrying the MAC address of the destination UNI-C device is sent to the destination UNI-C device; when the destination MAC address field of the data packet carries the destination UNI-C device When the MAC address is recognized, the packet is sent to the destination UNI-C device. Purpose The UNI-C device is used to receive packets forwarded by the destination UNI-N device.

According to the foregoing technical solution provided by the embodiment of the present invention, by carrying a specific MAC address in a destination MAC address field of a data packet, the source UNI-C device can encapsulate the data packet, so that data can be sent to the transmission network, unlike related technologies. That way, the packet cannot be generated. When the data packet flows out of the transport network via the LSP, the destination MAC address field of the data packet carries the MAC address identifiable by the destination UNI-C device, so that the UNI-C device can identify the data packet, thereby implementing the UNI-C. Communication between devices, UNI-C devices in the data network will not be blocked due to the introduction of the transport network. Therefore, the UNI-C device can utilize the transmission network for efficient data transmission, so that the fusion of the transmission network and the data network can be realized. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can obtain other drawings according to these drawings without paying any creative work.

1 is a schematic diagram of an example of a network environment on which an embodiment of the present invention is based.

2 is a flow chart of a method for data transmission in accordance with an embodiment of the present invention.

3 is a flow chart of another method for data transmission in accordance with an embodiment of the present invention.

4 is a diagram showing an example of message interaction in the process of establishing an LSP between UNI-C devices according to an embodiment of the present invention.

5 is a flow chart of still another method for data transmission in accordance with an embodiment of the present invention.

6 is a diagram showing an example of message interaction for acquiring a MAC address of a source UNI-N device according to an embodiment of the present invention.

Fig. 7 is a diagram showing an example of data transmission using the acquired MAC address of the source UNI-N device.

8 is a flow chart of still another method for data transmission in accordance with an embodiment of the present invention.

9 is a flow chart of still another method for data transmission in accordance with an embodiment of the present invention.

FIG. 10 is a structural block diagram of a network device according to an embodiment of the present invention.

11 is a block diagram showing the structure of another network device according to an embodiment of the present invention.

FIG. 12 is a structural block diagram of still another network device according to an embodiment of the present invention.

FIG. 13 is a structural block diagram of still another network device according to an embodiment of the present invention.

FIG. 14 is a structural block diagram of still another network device according to an embodiment of the present invention.

Figure 15 is a block diagram showing the structure of a system for data transmission according to an embodiment of the present invention. detailed description

BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions of the embodiments of the present invention will be clearly and completely described in the following description of the embodiments of the present invention. It is obvious that the described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person skilled in the art based on the described embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

First, a schematic diagram of an example of a network environment utilized by an embodiment of the present invention will be described with reference to FIG. The source UNI-C device in the data network wishes to pass the transmission network to another data network. The UNI-C device sends data. The data packet sent by the source UNI-C device enters the transmission network through the source UNI-N device at the edge of the transmission network, and flows out of the transmission network through the destination UNI-N device at the other edge of the transmission network. An LSP2 is established between the source UNI-C device and the destination UNI-C device. During the establishment of the LSP2, LSP1 between the source UNI-N device and the destination UNI-N device is utilized. LSP1 may be an LSP originally existing between the source UNI-N device and the destination UNI-N device, or may be a newly established LSP triggered between the source UNI-N device and the destination UNI-N device during LSP2 establishment. .

In the related art, since the source UNI-C device does not know the MAC address of the destination UNI-C device, it cannot encapsulate the data packet, and thus cannot transmit data. Even if data is sent, communication cannot be performed if the destination UNI-C device does not recognize it. These problems can be solved by the method proposed by the embodiment of the present invention, so that the source UNI-C device can communicate with the destination UNI-C device via the transmission network.

Next, a method 200 for data transmission according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 2, the method 200 includes: in S210, establishing an LSP with a destination UNI-N device and a destination UNI-N device with a destination UNI-C device; and in S220, generating a transmission to the destination UNI-C device The destination MAC address field carries the data packet of the specific MAC address; in S230, the data packet is sent on the LSP, so that when the data packet is output from the destination UNI-N device, the destination UNI-C device carries the destination UNI-C device to be recognized. MAC address.

For example, method 200 can be performed by a source UNI-C device. The source UNI-C device can establish an LSP with the destination UNI-C device in the manner provided by the related technology, the LSP passing through the source UNI-N device and the destination UNI-N device. The source UNI-C device can encapsulate the packet with a specific MAC address and send the packet out. When the data packet flows out of the destination UNI-N device via the LSP, the data packet carries the MAC address identifiable by the destination UNI-C device in the destination MAC address field, so that the destination UNI-C device receives and identifies the data packet, thereby implementing the source. Communication between the UNI-C device and the destination UNI-C device.

In S210, the source UNI-C device can use the RSVP-TE (Resource ReSerVation Protocol-Traffic Engineering) protocol to establish an LSP with the destination UNI-C device.

In S220, the source UNI-C device can carry a specific data packet by carrying a specific MAC address in the destination MAC address field of the Ethernet header of the data packet, so that the data packet can be sent out.

For example, the specific MAC address may be the MAC address of the destination UNI-C device, for example, The MAC address of the destination UNI-C device is obtained during the LSP establishment process, which will be specifically described in conjunction with FIG. 3 and FIG. The specific MAC address may also be the MAC address of the source UNI-N device, and the MAC address of the other party may be obtained by the message exchanged on the data link between the source UNI-C device and the source UNI-N device, for example, by combining FIG. And the method described in Figure 6. The specific MAC address may also be a preset MAC address, which is a MAC address recognizable by the destination UNI-C device set in advance. When the destination UNI-C device sees the preset MAC address, the data may be confirmed. The package is sent to yourself.

In S230, the source UNI-C device transmits a data packet to the destination UNI-C device via the LSP established in S210. After the source UNI-N device adds the transport network label to the data packet, it continues to forward on the LSP. After the destination UNI-N device receives the data packet carrying the transport network label, the destination UNI-N device deletes the transport network label because the data packet will flow out of the transport network.

When the destination UNI-N device deletes the label, the data packet may not be processed. In this case, the destination MAC address field of the data packet itself carries the MAC address recognizable by the destination UNI-C device, so that the data packet is used by the destination UNI-C device. Identified. When the destination UNI-N device deletes the label, the data packet may also be processed. At this time, the destination UNI-N device fills the MAC address of the destination UNI-C device it learned before to the destination MAC address of the Ethernet header of the data packet. The field makes the packet inevitably recognized by the destination UNI-C device. In any case, when a packet flows out of the destination UNI-N device, the packet can be identified by the destination UNI-C device, so that the destination UNI-C device can receive the data sent to it by the source UNI-C device, implementing both Communication between the transmission networks.

According to an embodiment of the present invention, a preset MAC address that can be identified by the destination UNI-C device different from its own MAC address can be set in advance. Purpose After seeing the preset MAC address, the UNI-C device knows that the data packet is sent to itself, for example, directly submitting the data part of the data packet to the network layer entity. At this time, since the data packet sent by the source UNI-C device carries the preset MAC address, the data packet flowing out from the destination UNI-N device also carries the preset MAC address, so the source UNI-N device and the destination UNI-N device pair The data packet is transparently transmitted, and only the transport network label is added, and the transport network label is deleted. Therefore, when the preset MAC address is adopted, since the data is transparently transmitted between the UNI-C devices by using the transmission network, the transmission network can directly perform label switching without affecting communication between the UNI-C devices, and also makes the UNI- The LSP between the C devices can be directly used as the outer tunnel of the virtual private network (VPN).

A method for data transmission according to an embodiment of the present invention, through the purpose of a data packet The MAC address field carries a specific MAC address, and the source UNI-C device can encapsulate the data packet, so that data can be transmitted to the transport network without being able to generate a data packet as in the related art. When the data packet flows out of the transport network via the LSP, the destination MAC address of the data packet carries the MAC address identifiable by the destination UNI-C device, so that the destination UNI-C device receives and identifies the data packet, thereby implementing the UNI. -C-device communication, UNI-C devices in the data network will not be blocked due to the introduction of the transport network. Therefore, the UNI-C device can utilize the transmission network for efficient data transmission, so that the fusion of the transmission network and the data network can be realized.

3 is a flow diagram of a method 300 for data transmission in accordance with an embodiment of the present invention. S310 through S330 of method 300 are substantially identical to S210 through S230 of method 200.

In S312, when the LSP is established, an LSP establishment request is sent to the destination UNI-C device. The source UNI-C device can use the path PATH message to send an LSP setup request. According to an embodiment of the present invention, when the LSP is established, the source UNI-C device may send an LSP establishment request carrying the MAC address of the active UNI-C device to the destination UNI-C device. In this way, when the destination UNI-C device receives the LSP establishment request, it can obtain the MAC address of the source UNI-C device, so that it can be used in the data packet sent to the source UNI-C device. In addition, since the source UNI-N device will also receive the LSP establishment request, it can also learn the MAC address of the source UNI-C device.

In S314, the receiving destination UNI-C device responds with an LSP establishment response that is returned by the LSP establishment request and carries the MAC address of the destination UNI-C device.

The UNI-C device can use the resource reservation RES V message to return the LSP to the source UNI-C device to establish a response. The LSP establishment response carries the MAC address of the destination UNI-C device. In this way, the source UNI-C device can obtain the MAC address of the destination UNI-C device and carry it as a destination MAC address field in the data packet, thereby transmitting a complete data packet.

According to the method for data transmission provided by the embodiment of the present invention, the source UNI-C device acquires the MAC address of the destination UNI-C device for data packet encapsulation, and the source UNI-N device and the destination UNI-N device only need to use the data packet. By adding labels and deleting labels, the packets flowing from the destination UNI-N device can be identified by the destination UNI-C device because the destination MAC address field carries the MAC address of the destination UNI-C device. Therefore, transparent transmission of data packets between the source UNI-C device and the destination UNI-C device can be achieved. Since the MAC address based on the destination UNI-C device transparently transmits data between the UNI-C devices by using the transmission network, the transmission network can directly perform label switching without affecting communication between the UNI-C devices, and also makes the UNI-C The LSP between devices can be directly used as the outer tunnel of the VPN. For example, the MAC address of the destination UNI-C device can be obtained in the process of establishing an LSP by using the method shown in FIG. The LSP establishment request may be a PATH message, and the LSP establishment response may be a RES V message.

In S410, the source UNI-C device initiates a request to establish an LSP with the destination UNI-C device, and sends a path PATH message. The MAC address of the source UNI-C device can be carried in the PATH message, which can be the MAC address of the source UNI-C device or the MAC address of the local interface used by the LSP.

In S420, after the source UNI-N device receives the PATH message, the PATH message is saved. If the PATH message carries the MAC address of the active UNI-C device, the source UNI-N device can learn the MAC address.

In S430, the source UNI-N device checks whether there is an LSP in the transport network that can carry the LSP between the UNI-C devices. If there is no existing LSP available in the transport network, the source UNI-N device triggers the establishment of a new LSP in the transport network, which can be called a Forwarding Adjacency-LSP (Failed Adjacency-LSP).

The establishment process of the FA-LSP can be completed as follows: The source UNI-N device initiates establishment.

The request of the FA-LSP sends a PATH message; the intermediate node of the transport network forwards the PATH message to the destination UNI-N device; the destination UNI-N device returns a RESV message in response to the PATH message; the intermediate node forwards the RESV message and delivers the source UNI-N equipment. Thus, a FA-LSP path is established between the source UNI-N device and the destination UNI-N device.

In S440, the source UNI-N device directly forwards the PATH message sent by the source UNI-C device to the destination UNI-N device.

In S450, the destination UNI-N device sends a PATH message to the destination UNI-C device. Purpose A UNI-N device can carry its own MAC address in the PATH message so that the destination UNI-C device can know its MAC address.

In S460, after the destination UNI-C device receives the PATH message, the resource reservation is performed. in case

The PATH message carries the MAC address of the active UNI-C device, and learns the MAC address of the source UNI-C device. If the PATH message carries the MAC address of the destination UNI-N device, the MAC address of the destination UNI-N device is learned. The learned MAC address can be used to send a packet to the source UNI-C device on the established LSP. At the same time, the destination UNI-C device returns a RESV message in response to the PATH message, and the RESV message carries the MAC address of the destination UNI-C device, which may be the MAC address of the destination UNI-C device or the LSP interface. MAC address.

In S470, after receiving the RESV message, the destination UNI-N device can learn the MAC address of the destination UNI-C device carried in the RESV message. And, the destination UNI-N device forwards the RESV message directly to the source UNI-N device.

In S480, after receiving the RESV message, the source UNI-N device can directly send the RESV message to the source UNI-C device, so that the source UNI-C device can obtain the MAC address of the destination UNI-C device. In addition, the source UNI-N device may also carry its own MAC address in the RESV message and send it to the source UNI-C device, so that the source UNI-C device obtains the MAC address of the source UNI-N device.

In the PATH message or RESV message, the RES V_HOP object in the message can be used to carry the MAC address. For example, the length type value TLV field is extended in the RESV_HOP object, and the MAC address is carried in the TLV field.

In the process shown in Figure 4, the source UNI-C device can obtain the MAC address of the destination UNI-C device and obtain the source UNI-N device during the process of establishing the LSP between the source UNI-C device and the destination UNI-C device. The MAC address so that a specific MAC address can be used to encapsulate the packet for transmission to the destination UNI-C device.

When the data packet is encapsulated by the MAC address of the destination UNI-C device, the source UNI-N and the destination UNI-N device can directly transmit the received data packet, and the source UNI-N device and the destination UNI-N device only need to be completed. Add a transport network label and delete the transport network label.

When the data packet is encapsulated by the MAC address of the source UNI-N device, the source UNI-N and the destination UNI-N device cannot directly transmit the received data packet. At this time, the destination UNI-N device receives the source UNI-N. The data packet sent by the device for the destination UNI-C device needs to replace the content of the destination MAC address field in the data packet with the MAC address of the destination UNI-C device. Of course, those skilled in the art can think that the destination UNI-N device can fill the MAC of the destination UNI-C device, regardless of what content is carried in the destination MAC address field of the data packet after the destination UNI-N device deletes the transport network label. Address so that the destination UNI-C device can be identified.

In addition, similarly, if the source UNI-N device receives the data packet destined for the source UNI-C device, the content of the destination MAC address field of the data packet is also replaced with the MAC address of the source UNI-C device. Therefore, the source UNI-N device learns the MAC address of the source UNI-C device, and the destination UNI-N device learns the MAC address of the destination UNI-C device. The process of learning the MAC address may utilize the process described in connection with FIG. 4, as well as the process described in connection with FIG. The UNI-N device needs to be transparently transmitted to the received UNI-N device and the destination UNI-N device. To identify the packets sent by the UNI-C device, the UNI-C device also needs to learn the MAC address of the UNI-N device.

Next, a method 500 for data transmission in accordance with an embodiment of the present invention will be described in conjunction with FIG. S510 of method 500 is substantially the same as S210 of method 200.

In S512, the MAC address of the source UNI-N device is obtained from the source UNI-N device.

As described in connection with FIG. 4, in the process of establishing an LSP, the source UNI-C device can obtain the MAC address of the source UNI-N device from the RESV message returned by the source UNI-N device.

According to an embodiment of the present invention, the UNI-C device can also acquire the MAC address of the UNI-N device during other interactions with the UNI-N device. For example, during the data link verification process, information about the peer data link can be learned. According to an embodiment of the present invention, the source UNI-C device may receive a test TEST message carrying the MAC address of the source UNI-N device from the source UNI-N device when the data link is verified with the source UNI-N device. At this time, the MAC address information can be carried by extending the TEST message of the Link Management Protocol (LMP). After the source UNI-C device learns the MAC address, it can solve the encapsulation problem of the MAC address and encapsulate the data packet.

Next, a schematic diagram of an example of message interaction in which the source UNI-C device acquires the MAC address of the source UNI-N device will be described with reference to FIG.

In S610, the source UNI-N device sends a Start Verify BeginVerify message to the source UNI-C device, requesting data link check.

In S620, the source UNI-C device sends a start verification confirmation to the source UNI-N device.

A BeginVerifyACK message indicating that verification is possible.

In S630, the source UNI-N device sends a test TEST message to the source UNI-C device on the data link, and the TEST message carries the MAC address of the source UNI-N device. The MAC address can be carried by extending the "3⁄4" of the TEST message, for example, adding a field carrying the MAC address.

In S640, after the source UNI-C device learns the MAC address, it returns a test status success TestStatusSuccess message to the source UNI-N device.

In S650, the source UNI-N device returns a test status determination TestStatusAck message to the source UNI-C device.

In S660, the source UNI-C device sends an End Check EndVerify message to the source UNI-N device, indicating that the check is over.

In S670, the source UNI-N device sends an end check confirmation to the source UNI-C device. The EndVerifyAck message is answered.

In this way, the source UNI-C device can obtain the MAC address of the source UNI-N device through the TEST message during the data link verification process. When the verification process is reversed, the source UNI-C device can cause the source UNI-N device to obtain the MAC address of the source UNI-C device through the TEST message by carrying its own MAC address in the TEST message. Similarly, the UNI-N device and the destination UNI-C device can also obtain the MAC address of the other party through the data chain saw verification process. For example, the MAC address can be carried in the TEST message and sent to the other party.

After the UNI-C device and the UNI-N device learn each other's MAC address, the data packet sent by the source UNI-C device to the destination UNI-C device can be transmitted in the manner shown in FIG.

In S520, since the MAC address of the source UNI-N device is obtained, a packet transmitted to the destination UNI-C device and carrying the MAC address of the source UNI-N device in the destination MAC address field is generated.

In S530, when the data packet is transmitted on the LSP and reaches the destination UNI-N device, the destination UNI-N device replaces the MAC address of the source UNI-N device in the destination MAC address field of the data packet when the data packet is output. The MAC address of the UNI-C device for the purpose. In this way, the destination UNI-C device can identify the data packets transmitted on the LSP, thereby enabling communication between the UNI-C devices.

According to the method for data transmission provided by the embodiment of the present invention, the source UNI-C device may encapsulate the data packet by using the MAC address of the source UNI-N device obtained by interacting with the source UNI-N device on the data link, so that the data The packet can be successfully transmitted on the LSP. By means of the MAC address replacement performed by the destination UNI-N device, the destination UNI-C device can identify the data packet, so that the UNI-C device can communicate through the transmission network, and the data network and the transmission network can be realized.

In Fig. 7, the case where the source UNI-C device encapsulates the data packet with the MAC address of the source UNI-N device as the destination MAC address and transmits the destination UNI-N device to replace the destination MAC address field is shown. Among them, A) shows that the source UNI-C device and the destination UNI-C device are in the Ethernet, and B) shows that the source UNI-C device and the destination UNI-C device are in the virtual local area network (Virtual Local-area Network, The case of VLAN). Only the contents carried in the destination MAC address field are shown in the Ethernet header of the packet of FIG.

On the link between the source UNI-C device and the source UNI-N device, the source UNI-C device and the source UNI-N device have MAC addresses of MAC1 and MAC2, respectively. On the link between the destination UNI-N device and the destination UNI-C device, the destination UNI-N device and the destination UNI-C device respectively have There are MAC addresses for MAC3 and MAC4.

The data packet sent by the source UNI-C device carries MAC2 in the destination MAC address field. When the source UNI-N device receives the data packet, it adds a transport network label to the data packet and then forwards it to the destination UNI-N device. Purpose The UNI-N device removes the transport network label, replaces the MAC2 carried in the destination MAC address field with MAC4, and then sends it to the destination UNI-C device. Purpose After the UNI-C device receives the data packet, since the destination MAC address is MAC4, the destination UNI-C device recognizes the data packet and performs subsequent operations.

Next, a method 800 for data transmission in accordance with an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 8, the method 800 includes: In S810, when receiving a data packet sent by the source UNI-C device to the destination UNI-C device on the LSP, deleting the transport network label carried by the data packet, where the LSP is the source The UNI-C device and the destination UNI-C device establish an LSP via the source UNI-N device and the destination UNI-N device; in S820, when the destination MAC address field of the data packet does not carry the MAC address identifiable by the destination UNI-C device At the time, the destination MAC address of the destination UNI-C device is filled in the destination MAC address field of the data packet; in S830, the data packet carrying the MAC address of the destination UNI-C device is transmitted to the destination UNI-C device.

For example, method 800 can be performed by a destination UNI-N device. When the data packet flows out of the destination UNI-N device, if the data packet does not carry the MAC address identifiable by the destination UNI-C device, the destination UNI-N device fills the destination MAC address field of the data packet with the MAC address of the destination UNI-C device. The address, in this way, ensures that the destination UNI-C device receives and identifies the data packet, thereby enabling communication between the source UNI-C device and the destination UNI-C device.

In S810, the source UNI-N device receives the data packet sent by the source UNI-C device from the data network side, adds the transport network label to the data packet, sends it to the LSP of the transport network, and forwards it to the destination UNI-N device. Since the data packet will flow out of the transport network, the destination UNI-N device deletes the transport network label.

In S820, the MAC address identifiable by the destination UNI-C device may be the MAC address of the destination UNI-C device or a preset MAC address. If the packet does not carry the identifiable MAC address of the destination UNI-C device, the destination UNI-N device is replaced with the MAC address of the destination UNI-C device.

The destination UNI-N device obtains the MAC address of the destination UNI-C device. It can be obtained during the process of establishing an LSP. It can also be obtained during the data link verification process. It can also be obtained in other interaction processes. For related content, refer to the above. The contents described in conjunction with FIG. 4 and FIG. 6 are not described herein again in order to avoid redundancy. According to the method for data transmission provided by the embodiment of the present invention, when a data packet flows out from the transport network via the LSP, when the destination MAC address of the data packet cannot be identified by the destination UNI-C device, the destination UNI-N device is in the data packet. The destination MAC address field is filled with the MAC address of the destination UNI-C device. This ensures that the destination UNI-C device can identify the data packet, thus enabling communication between UNI-C devices. The UNI-C device in the data network does not. Communication will be blocked due to the introduction of the transmission network. Therefore, the UNI-C device can utilize the transmission network for efficient data transmission, so that the fusion of the transmission network and the data network can be realized.

9 is a flow diagram of a method 900 for data transmission in accordance with an embodiment of the present invention. S910 to S930 of method 900 are substantially the same as S810 to S830 of method 800.

In S912, the MAC address of the destination UNI-C device is obtained from the destination UNI-C device. For example, the destination UNI-N device can obtain the MAC address of the destination UNI-C device during the process of establishing the LSP, during the data link verification process, or other interaction process with the destination UNI-C device. Thus, in S920, the destination MAC address field of the data packet can be filled with the MAC address of the acquired destination UNI-C device.

According to an embodiment of the present invention, the destination UNI-N device may receive a test TEST message carrying the MAC address of the destination UNI-C device from the destination UNI-C device when the data link is verified with the destination UNI-C device. For related content, refer to the related description of FIG. 6. The message of interaction is basically the same as that shown in FIG. 6. The source UNI-N device of FIG. 6 is replaced with the destination UNI-C device, and the source UNI-C device of FIG. 6 is replaced with the target UNI. -N device can be.

In S914, the MAC address of the destination UNI-N device is transmitted to the destination UNI-C device. As described above in connection with FIG. 4 and FIG. 6, the destination UNI-N device can also inform its destination MAC address to the destination UNI-C device, so that when the destination UNI-C device sends a data packet to the source UNI-C device, The data packet is encapsulated by filling the MAC address of the destination UNI-N device in the data packet.

According to the method for data transmission provided by the embodiment of the present invention, the destination UNI-N device can ensure that the data packet flowing out from the destination UNI-N device can be used by the destination UNI-C by acquiring the MAC address of the destination UNI-C device and using it. Device identification, thereby enabling communication between the source UNI-C device and the destination UNI-C device.

In the above, a method for data transmission according to an embodiment of the present invention has been described. Hereinafter, a structural block diagram of a network device according to an embodiment of the present invention will be described with reference to FIGS. 10 through 14.

FIG. 10 is a structural block diagram of a network device 1000 according to an embodiment of the present invention. The network device 1000 includes an establishing module 1010, a generating module 1020, and a first sending module 1030. The setup module 1010 can be configured to establish an LSP with the destination UNI-N device and the destination UNI-N device with the destination UNI-C device. The generating module 1020 can be configured to generate a data packet that is sent to the destination UNI-C device and carries a specific MAC address in the destination MAC address field. The first sending module 1030 can be configured to send a data packet on the LSP, so that when the data packet is output from the destination UNI-N device, the MAC address identifiable by the destination UNI-C device is carried in the destination MAC address field.

The foregoing operations and/or functions of the module 1010, the generating module 1020, and the first sending module 1030 may refer to S210 to S230 of the foregoing method 200. To avoid repetition, details are not described herein.

The network device provided by the embodiment of the present invention can encapsulate the data packet by carrying the specific MAC address in the destination MAC address field of the data packet, so that the data can be sent to the transmission network, and the data packet cannot be generated as in the related art. When the data packet flows out of the transport network via the LSP, the destination MAC address of the data packet carries the MAC address identifiable by the destination UNI-C device, so that the destination UNI-C device receives and identifies the data packet, thereby implementing the UNI. -C-device communication, UNI-C devices in the data network will not be blocked due to the introduction of the transport network. Therefore, the UNI-C device can utilize the transmission network for efficient data transmission, so that the fusion of the transmission network and the data network can be realized.

FIG. 11 is a block diagram showing the structure of a network device 1100 according to an embodiment of the present invention. The establishing module 1110, the generating module 1120, and the first sending module 1130 of the network device 1100 are substantially the same as the establishing module 1010, the generating module 1020, and the first sending module 1030 of the network device 1000.

The destination MAC address of the UNI-C device can be the MAC address of the destination UNI-C device. The MAC address that can be identified by the UNI-C device may also be a preset MAC address. In this case, the generating module 1120 may be configured to generate a data packet that is sent to the destination UNI-C device and carries the preset MAC address in the destination MAC address field.

According to an embodiment of the present invention, the network device 1100 may further include a second transmitting module 1112 and a receiving module 1114. The second sending module 1112 is configured to send an LSP establishment request to the destination UNI-C device when the LSP is established. The receiving module 1114 can be configured to receive an LSP setup response that carries the MAC address of the destination UNI-C device returned by the destination UNI-C device in response to the LSP establishment request. At this time, the generating module 1120 can be configured to generate a data packet that is sent to the destination UNI-C device and that carries the MAC address of the destination UNI-C device in the destination MAC address field.

According to an embodiment of the present invention, the second sending module 1112 can be used to set the destination UNI-C The LSP establishment request carrying the MAC address of the network device 1100 is sent to enable the source UNI-N device or the destination UNI-C device to learn the MAC address of the network device 1100.

According to an embodiment of the present invention, the LSP establishment request may be a path PATH message, and the LSP establishment response may be a resource reservation RESV message.

The foregoing and other operations and/or functions of the second sending module 1112, the receiving module 1114, and the generating module 1020 may refer to the related content in the foregoing method 200 and S312 and S314 in the method 300. To avoid repetition, details are not described herein again.

The network device provided by the embodiment of the present invention may carry the preset MAC address or the obtained MAC address of the destination UNI-C device in the destination MAC address field of the data packet for encapsulation, and the source UNI-N device and the destination UNI-N device only need to be encapsulated. By adding a transport network label to the data packet and deleting the transport network label operation, the data packet flowing out from the destination UNI-N device can be identified by the destination UNI-C device. Therefore, transparent transmission of data packets between the source UNI-C device and the destination UNI-C device can be achieved. Since the data can be transparently transmitted between the UNI-C devices by using the transmission network, the transmission network can directly perform label switching without affecting communication between the UNI-C devices, and the LSP between the UNI-C devices can be directly used as The outer tunnel of the VPN is used.

FIG. 12 is a block diagram showing the structure of a network device 1200 according to an embodiment of the present invention.

The establishing module 1210 of the network device 1200, the generating module 1220, and the first sending module 1230 are substantially the same as the establishing module 1010, the generating module 1020, and the first sending module 1030 of the network device 1000.

Network device 1200 may also include an acquisition module 1240, in accordance with an embodiment of the present invention. The obtaining module 1240 can be configured to obtain the MAC address of the source UNI-N device from the source UNI-N device. At this time, the generating module 1220 may be configured to generate a data packet that is sent to the destination UNI-C device and that carries the MAC address of the source UNI-N device in the destination MAC address field, where the destination UNI-N device will source the UNI when outputting the data packet. The MAC address of the -N device is replaced with the MAC address of the destination UNI-C device.

According to an embodiment of the present invention, the obtaining module 1240 is operable to receive, from the source UNI-N device, a test TEST message carrying the MAC address of the source UNI-N device when the data link is verified with the source UNI-N device.

The foregoing and other operations and/or functions of the obtaining module 1240 and the generating module 1220 may refer to S512, S520, and S530 of the foregoing method 500. To avoid repetition, details are not described herein again. The MAC address of the source UNI-N device obtained by the interaction encapsulates the data packet so that the data packet can be successfully transmitted on the LSP. By means of MAC address replacement by the destination UNI-N device, the destination UNI-C device can identify the data packet, so that the UNI-C device can communicate through the transmission network, and the data network and the transmission network are integrated.

FIG. 13 is a block diagram showing the structure of a network device 1300 according to an embodiment of the present invention.

Network device 1300 includes a delete module 1310, a fill module 1320, and a send module 1330. The deleting module 1310 is configured to: when receiving the data packet sent by the source UNI-C device to the destination UNI-C device on the LSP, delete the transport network label carried by the data packet, where the LSP is the source UNI-C device and the destination UNI-C The LSP established by the device via the source UNI-N device and the network device 1300. The padding module 1320 can be configured to fill the MAC address of the destination UNI-C device in the destination MAC address field of the data packet when the destination MAC address field of the data packet does not carry the MAC address recognizable by the destination UNI-C device. The sending module 1330 can be configured to send a data packet carrying the MAC address of the destination UNI-C device to the destination UNI-C device.

The foregoing and other operations and/or functions of the deleting module 1310, the filling module 1320, and the transmitting module 1330 may refer to S810 to S830 of the above method 800. To avoid repetition, details are not described herein.

According to the network device provided by the embodiment of the present invention, when a data packet flows out from the transmission network via the LSP, when the destination MAC address of the data packet cannot be identified by the destination UNI-C device, the network device may be in the destination MAC address field of the data packet. The MAC address of the destination UNI-C device is filled in, so that the destination UNI-C device can identify the data packet, so that communication between the UNI-C devices can be realized, and the UNI-C device in the data network is not introduced by the transmission network. Communication is blocked. Therefore, the UNI-C device can utilize the transmission network for efficient data transmission, so that the fusion of the transmission network and the data network can be realized.

FIG. 14 is a block diagram showing the structure of a network device 1400 according to an embodiment of the present invention.

The deleting module 1410, the filling module 1420, and the transmitting module 1430 of the network device 1400 are substantially the same as the deleting module 1310, the filling module 1320, and the transmitting module 1330 of the network device 1300.

The destination UNI-C device can identify the MAC address of the destination UNI-C device or the default MAC address.

Network device 1400 may also include an acquisition module 1440, in accordance with an embodiment of the present invention. The obtaining module 1440 can be configured to obtain the MAC address of the destination UNI-C device from the destination UNI-C device. For example, the acquisition module 1440 can be used to verify the data link with the destination UNI-C device, from the purpose The UNI-C device receives a test TEST message carrying the MAC address of the destination UNI-C device.

The above and other operations and/or functions of the acquisition module 1440 can be referred to the above method 900

S912, in order to avoid repetition, will not be described here.

The network device provided by the embodiment of the present invention can ensure that the data packet flowing out from the destination UNI-N device can be identified by the destination UNI-C device by obtaining the MAC address of the destination UNI-C device, thereby implementing the source UNI-C device and the destination UNI. -C communication between devices.

Next, a system 1500 for data transmission according to an embodiment of the present invention will be described with reference to FIG. The system 1500 includes a source user network interface client side UNI-C device 1510, a source user network interface network side UNI-N device 1520, a destination UNI-N device 1530, and a source UNI-C device 1540.

The source UNI-C device 1510 can be used to establish an LSP with the destination UNI-N device 1520 and the destination UNI-N device 1530 with the destination UNI-C device 1540; generate a specific carry in the destination MAC address field to the destination UNI-C device 1540. A packet of a MAC address; a packet is sent on the LSP.

The source UNI-N device 1520 can be used to receive packets sent by the source UNI-C device 1510 and add transport network labels to the data packets.

The destination UNI-N device 1530 can be configured to delete the transport network label when receiving the data packet forwarded by the source UNI-N device 1520; when the destination MAC address field of the data packet does not carry the MAC address recognizable by the destination UNI-C device 1540 Filling the MAC address of the destination UNI-C device 1540 in the destination MAC address field of the data packet, and transmitting the data packet carrying the MAC address of the destination UNI-C device 1540 to the destination UNI-C device 1540; when the destination MAC address field of the data packet When the MAC address identifiable by the destination UNI-C device 1540 is carried, the data packet is transmitted to the destination UNI-C device 1540.

Purpose The UNI-C device 1540 can be used to receive packets forwarded by the destination UNI-N device 1530. According to an embodiment of the present invention, the destination UNI-C device 1540 identifiable MAC address is the MAC address of the destination UNI-C device 1540 or a preset MAC address.

The above and other functions and/or operations of the source UNI-C device 1510, the source UNI-N device 1520, the destination UNI-N device 1530, and the source UNI-C device 1540 may be referred to the above description in conjunction with FIGS. 2 through 9, in order to avoid Repeat, no longer repeat them here.

According to the system for data transmission provided by the embodiment of the present invention, the source UNI-C device can encapsulate the data packet by carrying a specific MAC address in the destination MAC address field of the data packet, so that data can be sent to the transmission network without A packet cannot be generated as in the related art. When data When the packet flows out of the transport network via the LSP, the destination MAC address of the destination UNI-C device is carried in the destination MAC address field of the data packet, so that the destination UNI-C device receives and identifies the data packet, thereby implementing UNI-C. Communication between devices, UNI-C devices in the data network will not be blocked due to the introduction of the transport network. Therefore, the UNI-C device can utilize the transmission network for efficient data transmission, so that the fusion of the transmission network and the data network can be realized.

Those skilled in the art will appreciate that the various method steps and elements described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate the interworking of hardware and software. In the above description, the steps and compositions of the various embodiments have been generally described in terms of function. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the solution. Those skilled in the art can use different methods for implementing the described functions for each particular application, but such implementations should not be considered to be beyond the scope of the present invention.

The method steps described in connection with the embodiments disclosed herein may be implemented in hardware, a software program executed by a processor, or a combination of both. Software programs can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM or technology Any other form of storage medium known.

While some embodiments of the present invention have been shown and described, it will be understood by those skilled in the art It is within the scope of the invention.

Claims

Rights request

A method for data transmission, comprising:

The user-side network interface UNI-C device establishes a label switched path LSP via the source user network interface network side UNI-N device and the destination UNI-N device;

Generating, by the destination UNI-C device, a data packet carrying a specific MAC address in a destination medium access control MAC address field;

And transmitting the data packet on the LSP, so that when the data packet is output from the destination UNI-N device, a MAC address recognizable by the destination UNI-C device is carried in the destination MAC address field.

The method according to claim 1, wherein the MAC address identifiable by the destination UNI-C device is a MAC address of the destination UNI-C device.

3. The method according to claim 2, further comprising:

Sending an LSP establishment request to the destination UNI-C device when the LSP is established; receiving an LSP carrying the MAC address of the destination UNI-C device returned by the destination UNI-C device in response to the LSP establishment request Establish a response;

The generating, by the destination UNI-C device, the data packet carrying the specific MAC address in the destination MAC address field includes:

Generating a data packet to the destination UNI-C device that carries the MAC address of the destination UNI-C device in the destination MAC address field.

The method according to claim 3, wherein the sending an LSP establishment request to the destination UNI-C device includes:

Sending an LSP establishment request carrying the MAC address of the active UNI-C device to the destination UNI-C device, so that the source UNI-N device or the destination UNI-C device learns the source UNI-C device MAC address.

The method according to claim 3 or 4, wherein the LSP establishment request is a path PATH message, and the LSP establishment response is a resource reservation RESV message.

6. The method according to claim 2, further comprising:

Obtaining, by the source UNI-N device, a MAC address of the source UNI-N device;

The generating, by the destination UNI-C device, the data packet carrying the specific MAC address in the destination MAC address field includes: Generating, to the destination UNI-C device, a data packet carrying a MAC address of the source UNI-N device in a destination MAC address field, where the destination UNI-N device outputs the data packet The MAC address of the source UNI-N device is replaced with the MAC address of the destination UNI-C device.

The method according to claim 6, wherein the obtaining, by the source UNI-N device, the MAC address of the source UNI-N device comprises:

Upon verifying the data link with the source UNI-N device, a test TEST message carrying the MAC address of the source UNI-N device is received from the source UNI-N device.

The method according to claim 1, wherein the MAC address identifiable by the destination UNI-C device is a preset MAC address,

Generating a data packet that is sent to the destination UNI-C device and carries the preset MAC address in a destination MAC address field.

A method for data transmission, comprising:

Deleting the transport network label carried by the data packet when the source UNI-C device sends the data packet to the destination UNI-C device on the LSP, where the LSP is the source UNI-C device and the destination An LSP established by the UNI-C device via the source UNI-N device and the destination UNI-N device;

When the destination MAC address field of the data packet does not carry the MAC address identifiable by the destination UNI-C device, filling the MAC address of the destination UNI-C device in the destination MAC address field of the data packet;

Sending a packet carrying the MAC address of the destination UNI-C device to the destination UNI-C device.

The method according to claim 9, wherein the MAC address identifiable by the destination UNI-C device is a MAC address or a preset MAC address of the destination UNI-C device.

The method according to claim 9, wherein, before the destination MAC address field of the data packet is filled with the MAC address of the destination UNI-C device, the method further includes: from the destination UNI-C The device acquires the MAC address of the destination UNI-C device.

The method according to claim 11, wherein the obtaining the MAC address of the destination UNI-C device from the destination UNI-C device comprises:

When the data link is verified with the destination UNI-C device, it is connected from the destination UNI-C device. A test TEST message carrying the MAC address of the destination UNI-C device is received.

13. A network device, comprising:

Establishing a module for establishing an LSP with the destination UNI-N device and the destination UNI-N device with the destination UNI-C device;

a generating module, configured to generate a data packet that is sent to the destination UNI-C device and carries a specific MAC address in a destination MAC address field;

a first sending module, configured to send the data packet on the LSP, so that the destination UNI-C is carried in the destination MAC address field when the data packet is output from the destination UNI-N device The MAC address that the device can recognize.

The network device according to claim 13, wherein the MAC address identifiable by the destination UNI-C device is a MAC address of the destination UNI-C device.

The network device according to claim 14, further comprising: a second sending module, configured to send an LSP establishment request to the destination UNI-C device when the LSP is established;

a receiving module, configured to receive an LSP establishment response that is sent by the destination UNI-C device and is returned by the LSP establishment request, and carries a MAC address of the destination UNI-C device;

The generating module is configured to generate a data packet that is sent to the destination UNI-C device and that carries a MAC address of the destination UNI-C device in a destination MAC address field.

The network device according to claim 15, wherein the second sending module is configured to send, to the destination UNI-C device, an LSP establishment request that carries a MAC address of the network device, so that the The source UNI-N device or the destination UNI-C device learns the MAC address of the network device.

The network device according to claim 15 or 16, wherein the LSP establishment request is a path PATH message, and the LSP establishment response is a resource reservation RESV message.

The network device according to claim 14, further comprising: an obtaining module, configured to acquire a MAC address of the source UNI-N device from the source UNI-N device;

The generating module is configured to generate, by the destination UNI-C device, a data packet carrying a MAC address of the source UNI-N device in a destination MAC address field, where the target UNI-N device is outputting The data packet is replaced with the MAC address of the source UNI-N device as the MAC address of the destination UNI-C device.

The network device according to claim 18, wherein the acquiring module is configured to receive, when the data link is verified with the source UNI-N device, carry the Test TEST message for the MAC address of the source UNI-N device.

The network device according to claim 13, wherein the MAC address recognizable by the destination UNI-C device is a preset MAC address,

The generating module is configured to generate a data packet that is sent to the destination UNI-C device and that carries the preset MAC address in a destination MAC address field.

21. A network device, comprising:

a deleting module, configured to: when receiving a data packet sent by the source UNI-C device to the destination UNI-C device on the LSP, deleting the transport network label carried by the data packet, where the LSP is the source UNI-C An LSP established by the device and the destination UNI-C device via the source UNI-N device and the network device;

a filling module, configured to: when the destination MAC address field of the data packet does not carry the MAC address identifiable by the destination UNI-C device, filling the destination UNI-C device in the destination MAC address field of the data packet MAC address;

And a sending module, configured to send, to the destination UNI-C device, a data packet carrying a MAC address of the destination UNI-C device.

The network device according to claim 21, wherein the MAC address identifiable by the destination UNI-C device is a MAC address or a preset MAC address of the destination UNI-C device.

The network device according to claim 21, further comprising: an obtaining module, configured to acquire a MAC address of the destination UNI-C device from the destination UNI-C device.

The network device according to claim 23, wherein the acquiring module is configured to receive, when the data link with the destination UNI-C device is verified, the carrier from the destination UNI-C device The TEST message is tested for the MAC address of the destination UNI-C device.

25. A system for data transmission, comprising: a source user network interface client side UNI-C device, a source user network interface network side UNI-N device, a destination UNI-N device, and a source UNI-C device, among them:

The source UNI-C device is configured to establish, by the destination UNI-C device, an LSP via the source UNI-N device and the destination UNI-N device; and generate, send, to the destination UNI-C device The destination MAC address field carries a data packet of a specific MAC address; the data packet is sent on the LSP;

The source UNI-N device is configured to receive the data packet sent by the source UNI-C device, and add a transport network label to the data packet;

The destination UNI-N device is configured to delete the transport network label when receiving the data packet forwarded by the source UNI-N device; when the destination MAC address field of the data packet does not carry the destination UNI - When the MAC address of the C device is identifiable, the MAC address of the destination UNI-C device is filled in the destination MAC address field of the data packet, and the destination UNI-C device is sent to the destination UNI-C device. a data packet of a MAC address; when the destination MAC address field of the data packet carries a MAC address identifiable by the destination UNI-C device, sending the data packet to the destination UNI-C device;

The destination UNI-C device is configured to receive a data packet forwarded by the destination UNI-N device.

The system according to claim 25, wherein the MAC address identifiable by the destination UNI-C device is a MAC address or a preset MAC address of the destination UNI-C device.