WO2016177181A1

WO2016177181A1 - Data transmission method and device

Info

Publication number: WO2016177181A1
Application number: PCT/CN2016/077548
Authority: WO
Inventors: 谢勇; 赵科强; 高鹏; 杨扬
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-08-27
Filing date: 2016-03-28
Publication date: 2016-11-10
Also published as: CN106487678A

Abstract

A data transmission method and device. The data transmission method comprises: determining, upon transmitting second data to a first network element by a first link, that first data transmitted by the first network element has not been received from the first link within a first preset time; transmitting the second data by a second link; ceasing to transmit the second data by the first link after the second data is transmitted by the second link.

Description

Data transmission method and device

Technical field

This document relates to, but is not limited to, the field of communications, and in particular, to a data transmission method and apparatus.

Background technique

In the current IP (Internet Protocol) network, traffic (that is, data) is transmitted in the network in the format of a packet encapsulated in an IP packet header. In order to ensure the reliability of traffic transmission, both the carrier network and the enterprise network basically have active and standby link protection. Through the protection of the active and standby links, the reliable transmission of traffic can be basically guaranteed. However, when carriers and enterprises have active/standby cutover requirements or test active/standby switchover, data loss occurs. In the related art, if the active/standby switchover is performed by removing the optical fiber cutover, the optical fiber is disconnected at the physical level, and the traffic cannot be guaranteed to be lost. When the traffic of the network is cut off to the backup link, most operators and enterprises hope that the uplink and downlink traffic will not be lost.

In view of the problem that data packet loss occurs in the link switching process in the related art, an effective solution has not been proposed yet.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the invention provides a data transmission method and device, which can solve the problem that data packet loss occurs during the link switching process in the related art.

The embodiments of the present invention adopt the following technical solutions.

A data transmission method includes:

When the second data is sent to the first network element by using the first link, determining that the first data sent by the first network element is not received from the first link within the first predetermined time

Transmitting the second data by using a second link;

After transmitting the second data by using the second link, stopping sending the second data by using the first link.

Optionally, the stopping sending the second data by using the first link includes:

Turning off the laser of the first link for transmitting the second data.

Optionally, after the determining, by the first predetermined time, that the first data that is sent by the first network element is not received from the first link, the method further includes:

Turning off the laser of the first link for receiving the first data.

A data transmission method includes:

When the first data is sent to the second network element by using the first link, determining that the first data needs to be sent to the second network element by using the second link;

Transmitting, by the second link, the first data to the second network element;

After transmitting the first data by using the second link, stopping sending the first data by using the first link.

Optionally, the stopping sending the first data by using the first link includes:

Turning off the laser of the first link for transmitting the first data.

Optionally, when the second data sent by the second network element is received by using the first link, after the sending, by using the second link, the first data to the second network element, ,Also includes:

Determining that the second data sent by the second network element is not received from the first link within a second predetermined time;

Stopping, by using the first link, the second data sent by the second network element.

Optionally, the stopping, by using the first link, the second data that is sent by the second network element, includes:

Turning off the laser of the first link for receiving the second data sent by the second network element.

A data transmission device comprising:

The first determining module is configured to: when the first data is sent to the first network element by using the first link, determine that the first data that is sent by the first network element is not received from the first link in the first predetermined time;

a first sending module, configured to send the second data by using a second link;

The first stopping module is configured to stop sending the second data by using the first link after the first sending module sends the second data by using the second link.

Optionally, the first stopping module includes:

a first shut down unit configured to turn off the laser of the first link for transmitting the second data.

Optionally, the device further includes:

And closing the module, configured to close the first chain after the first determining module determines that the first data sent by the first network element is not received from the first link within a first predetermined time A laser for receiving the first data.

A data transmission device comprising:

a second determining module, configured to: when the first data is sent to the second network element by using the first link, determine that the first data needs to be sent to the second network element by using the second link;

a second sending module, configured to send the first data to the second network element by using the second link;

The second stopping module is configured to stop sending the first data by using the first link after the second sending module sends the first data by using the second link.

Optionally, the second stopping module includes:

a second closing unit configured to turn off the laser of the first link for transmitting the first data.

Optionally, the device further includes:

a third determining module, configured to: when the second data sent by the second network element is received by using the first link, use, by the second sending module, the second link to the second network element After transmitting the first data, determining that the second network element is not received from the first link within the second predetermined time The second data sent;

And a third stopping module, configured to stop receiving, by using the first link, the second data sent by the second network element.

Optionally, the third stopping module includes:

And a third closing unit configured to turn off the laser of the first link for receiving the second data.

A computer readable storage medium storing computer executable instructions for performing the above method.

At least one embodiment of the present invention determines that the first data is not received from the first link within the first predetermined time before transmitting the second data through the second link, thereby stopping the transmission of the second data by using the first link. It can be ensured that the data on the first link is received without packet loss before the data is sent by using the second link, which solves the problem that data packet loss occurs in the link switching process in the related art, thereby achieving the active/standby chain. The technical effect of complete data transmission during the road switching process.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a flow chart 1 of a data transmission method according to an embodiment of the present invention;

2 is a second flowchart of a data transmission method according to an embodiment of the present invention;

3 is a block diagram 1 of a structure of a data transmission apparatus according to an embodiment of the present invention;

4 is a block diagram showing the structure of a first stop module 36 in a data transmission apparatus according to an embodiment of the present invention;

FIG. 5 is a block diagram 1 of an optional structure of a data transmission apparatus according to an embodiment of the present invention; FIG.

6 is a structural block diagram 2 of a data transmission apparatus according to an embodiment of the present invention;

FIG. 7 is a structural block diagram of a second stop module 66 in a data transmission apparatus according to an embodiment of the present invention; FIG.

FIG. 8 is a block diagram 2 of an optional structure of a data transmission apparatus according to an embodiment of the present invention; FIG.

FIG. 9 is a structural block diagram of a third stop module 84 in a data transmission device according to an embodiment of the present invention. Figure

FIG. 10 is a schematic diagram of a primary and backup link protection scenario according to an embodiment of the present invention; FIG.

11 is a flowchart of a method for switching local end illumination from a primary link to a backup link according to an embodiment of the present invention;

FIG. 12 is a flowchart of a method for switching a peer end illumination from a primary link to a backup link according to an embodiment of the present invention.

Embodiments of the invention

It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not intended to describe a specific order or order.

A data transmission method is provided in this embodiment. FIG. 1 is a flowchart 1 of a data transmission method according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:

Step S102, determining that the first data that is sent by the first network element is not received from the first link in the first predetermined time, where the first link is further used to send the second data to the first network element (ie, currently Transmitting the second data to the first network element by using the first link);

Step S104: Send the second data by using the second link.

Step S106, after transmitting the second data by using the second link, stopping sending the second data by using the first link.

In the above step, it is determined that the first data that is sent by the first network element is not received from the first link in the first predetermined time, where the first link is further used to send the second data to the first network element, that is, the description When the first data is sent to the first network element by using the first link, if the first data sent by the first network element is not detected on the first link, the first link may have a problem, and other The link is transmitted with the first network element, that is, the link needs to be switched at this time. Therefore, the second link can be used to send the second data; after the second link is sent by using the second link, the first link is stopped. The second data is sent, so that after the link switching is completed, the data sent on the first link is received. After that, the data transmission on the first link is closed. Therefore, the problem that data packet loss occurs during the link switching process in the related art is solved, thereby achieving the technical effect of complete data transmission in the process of switching between the active and standby links. In this embodiment, the first link may be the primary link, the second link may be the standby link, or the first link may be the standby link, and the second link may be the primary link. If there is more than one alternate link, both the first link and the second link may also be alternate links.

In an optional embodiment, stopping sending the second data by using the first link in step S106 may include: turning off the laser for transmitting the second data of the first link. In this alternative embodiment, the use of a laser for data transmission may be to turn off the illumination function of the laser (ie, the laser may have both a light collection function and a light emission function), or may turn off the corresponding illumination laser (ie, the laser is Only a laser with a light-receiving function or a laser with only a light-emitting function).

In an optional embodiment, after the step S102, the data transmission method may further include: turning off the laser of the first link for receiving the first data. When it is determined that the first data sent by the first network element is not received from the first link in the first predetermined time, it may be learned that the first network element does not use the first link for data transmission in the first predetermined time, thereby Turning off the laser for receiving data of the first link can ensure that the data sent on the first link has been completely received, and no data packet loss occurs. In this alternative embodiment, the data is received by the laser, which may be to turn off the light collecting function of the laser, or to turn off the corresponding light receiving laser.

A data transmission method is also provided in the embodiment of the present invention. FIG. 2 is a second flowchart of a data transmission method according to an embodiment of the present invention. As shown in FIG. 2, the method includes:

Step S202, when the first data is sent to the second network element by using the first link, determining that the first data needs to be sent to the second network element by using the second link;

Step S204: Send the first data to the second network element by using the second link.

Step S206, after transmitting the first data by using the second link, stopping sending the first data by using the first link.

When the first data is sent to the second network element by using the first link, it is determined that the first data needs to be sent to the second network element by using the second link, that is, it is determined that the link switching needs to be performed, and the original use is performed. Transmitting the first data by using the first link, and transmitting the first data by using the second link; sending the first data to the second network element by using the second link, indicating that the link switching succeeds; After the first data is sent, the first data is stopped by using the first link, that is, after the link switching is completed, the sending of the first data of the first link is stopped, and the data transmission on the first link is ensured. During the handover process, the problem of data packet loss during link switching in the related art is solved, and the technical effect of complete data transmission during the active/standby link switching process is achieved. In this embodiment, the first link may be the primary link, the second link may be the standby link, or the first link may be the standby link, and the second link may be the primary link. If there is more than one alternate link, both the first link and the second link may also be alternate links.

In an optional embodiment, stopping sending the first data by using the first link in step S206 may include: turning off a laser for transmitting the first data of the first link. In this alternative embodiment, the data is transmitted by using a laser, which may be to turn off the illumination function of the laser, or to turn off the corresponding illumination laser.

In an optional embodiment, when the second data sent by the second network element is received by using the first link, after the step S204, the data sending method may further include: determining that the second predetermined time is not from the first chain. The second data sent by the second network element is received on the road; and the second data sent by the second network element is stopped by using the first link. In this optional embodiment, the second data is not received from the first link within the second predetermined time, that is, the data on the first link has been completely received, and the data on the first link can be guaranteed. After all the reception is completed, no packet will be lost.

In an optional embodiment, stopping the using the first link to receive the second data sent by the second network element in the foregoing optional embodiment may include: turning off the laser of the first link for receiving the second data. In this alternative embodiment, the data is received by the laser, which may be to turn off the light collecting function of the laser, or to turn off the corresponding light receiving laser.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium (such as ROM/RAM, magnetic). The discs and the optical discs include a plurality of instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method described in the embodiments of the present invention.

In the embodiment, a data transmission device is also provided. In this embodiment, the data transmission device is used for real The above embodiments and optional embodiments have been described and will not be described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments can be implemented by software, hardware, or a combination of software and hardware, is also possible and conceived.

3 is a block diagram showing the structure of a data transmission device according to an embodiment of the present invention. As shown in FIG. 3, the device includes a first determining module 32, a first transmitting module 34, and a first stopping module 36. Description.

The first determining module 32 is configured to determine that the first data that is sent by the first network element is not received from the first link in the first predetermined time, where the first link is further used to send the second data to the first network element. Data (ie, currently transmitting the second data to the first network element by using the first link); the first sending module 34 is connected to the first determining module 32, and configured to send the second data by using the second link; A stop module 36 is connected to the first sending module 34, and is configured to stop transmitting the second data by using the first link after the first sending module 34 sends the second data by using the second link.

4 is a structural block diagram of a first stop module 36 in a data transmission device according to an embodiment of the present invention. As shown in FIG. 4, the first stop module 36 includes: a first shutdown unit 42, and the first stop module 26 is described below. .

The first closing unit 42 is arranged to turn off the laser of the first link for transmitting the second data.

FIG. 5 is a block diagram showing an optional structure of a data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 5, the apparatus includes a shutdown module 52 in addition to all the modules shown in FIG. Description.

The closing module 52 is connected to the first determining module 32, and is configured to close the first data after the first network element is not received from the first link after determining that the first predetermined time is determined. A laser of a link for receiving first data.

The embodiment of the present invention further provides a data transmission device. FIG. 6 is a structural block diagram 2 of a data transmission device according to an embodiment of the present invention. As shown in FIG. 6, the device includes: a second determining module 62 and a second sending module. 64 and the second stop module 66, the device will be described below.

The second determining module 62 is configured to: when the first data is sent to the second network element by using the first link, determine that the first data needs to be sent to the second network element by using the second link; and the second sending module 64 is connected to The second determining module 62 is configured to send the first data to the second network element by using the second link, and the second stopping module 66 is connected to the second sending module 64, and configured to be utilized by the second sending module 64. After transmitting the first data, the second link stops transmitting the first data by using the first link.

FIG. 7 is a structural block diagram of a second stop module 66 in a data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 7, the second stop module 66 includes a second shutdown unit 72, which will be described below.

The second closing unit 72 is configured to turn off the laser for transmitting the first data of the first link.

8 is a block diagram 2 of an optional structure of a data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 8, the apparatus includes a third determination module 82 and a third stop module in addition to all the modules shown in FIG. 84. The device will be described below.

The third determining module 82 is connected to the second sending module 64, and is configured to use the second link to the second network element when receiving the second data sent by the second network element by using the first link. After the first data is sent, it is determined that the second data sent by the second network element is not received from the first link in the second predetermined time; the third stopping module 84 is connected to the third determining module 82, and configured to Stop receiving the second data sent by the second network element by using the first link.

FIG. 9 is a structural block diagram of a third stop module 84 in a data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 9, the third stop module 84 includes a third shutdown unit 92, and the third stop module 84 is performed below. Description.

The third closing unit 92 is configured to turn off the laser of the first link for receiving the second data.

The following describes the present invention by taking the first link as the primary link and the second link as the backup link as an example:

The technical solutions adopted by the embodiments of the present invention are generally as follows:

1. When shutting down the port of the traffic main link (that is, the first link in the above embodiment), the laser is turned off by delay, and the traffic is still sent from the primary link. The shutdown command is passed during the delay time. After the active/standby switchover is triggered, the traffic is switched to the backup link (that is, the second link in the foregoing embodiment), and then the local end (that is, the first network element in the foregoing embodiment) is turned off by the laser, thereby ensuring that the local end is uplinked. The traffic of the local end (that is, the first network element) may be a router or a switch. Backup link laser The receiving and illuminating of the device is always on when the active/standby link is switched, so that the data transmission and reception are not affected during the switching between the active and standby links.

2. After the primary port of the traffic is shut down, after the local laser is turned off, the peer (that is, the second network element in the above embodiment) does not receive the light, and then delays the notification of the end laser to turn off the light to ensure the opposite end. The downlink traffic can still be sent from the primary link. The active/standby switchover is notified during the delay period. After the traffic is switched to the backup link, the laser is turned off, thereby ensuring zero packet loss on the downstream downlink traffic. The peer end (ie, the second network element) may be a router or a switch. This achieves two-way (upstream and downstream) traffic without packet loss.

FIG. 10 is a schematic diagram of a primary and backup link protection scenario according to an embodiment of the present invention. As shown in FIG. 10, two-way traffic passes through two switches or routers, and two routers (or two switches) pass two pairs of fiber links. (Each pair of fibers respectively correspond to the first link and the second link described above), each pair of fibers has two fibers, one for each, one for receiving, and the physical layer laser sends light from the local end through the local transmitting fiber. To the opposite end, the opposite end also sends light from the local illuminating fiber to the opposite end through the laser, and the opposite end receives the traffic and then forwards it out.

FIG. 11 is a flowchart of a method for switching local end illumination from a primary link to a backup link according to an embodiment of the present invention. As shown in FIG. 11, the method includes the following steps:

In step S1102, when the local link is shut down, the shutdown command is sent to the physical port on the switch or the router, and the laser light and the light collection of the port are temporarily suspended. At this time, the traffic is routed inside the switch or the router. Or the outbound interface is switched to the egress of the standby link, and the traffic is directed to the backup link.

In step S1104, after the traffic is directed to the backup link, the laser light is turned off, and the light of the main link remains in the light-receiving state, so that the port is not closed, so that the traffic can be received from the opposite end;

In step S1106, after the opposite end receives no light for a predetermined time, the opposite end laser is turned off.

In the actual operation, since the light emitting end of the local laser is connected to the light receiving end of the opposite end laser through an optical fiber, the opposite end laser can detect that there is no light in the optical fiber link after the local laser is turned off. Thereby, the opposite end laser can be turned off.

FIG. 12 is a flowchart of a method for switching a peer end illumination from a primary link to a backup link according to an embodiment of the present invention. As shown in FIG. 12, the method includes the following steps:

In step S1202, when the local laser is turned off and the opposite end no longer receives the light, the opposite end also delays turning off the laser illumination, so that the downlink traffic can still be sent from the primary link to the local end, and the switch or the router is notified to perform the active/standby. Switch

Step S1204: After the traffic is completely switched to the standby link, the opposite end laser is turned off;

Step S1206, turning off the local laser to receive light;

Through steps S1202 to S1206, it is ensured that the downlink traffic also achieves zero packet loss.

After the steps shown in Figures 11 and 12 are completed, the two-way lasers are turned off, and then the two ports are completely turned off.

The method described in the step S1102 to the step S1106 and the step S1202 to the step S1206 in the embodiment of the present invention can not only reduce the uplink traffic of the local port but also reduce the downlink traffic of the peer end.

Figure 11 and Figure 12 show the common implementation of the two application scenarios, namely, the switch and the router. The protection between the active and standby links of the switch and the router can be divided into active and standby. Protection of scenarios such as routing active and standby, HSB (hot-standby, tunnel hot backup). The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings.

scene 1:

The hardware module includes two switches. The switch is connected by two pairs of fibers. The aggregation group is configured to perform active/standby protection, as shown in Figure 10.

The processing steps in the process section are as follows:

As shown in Figure 11, the switch is configured with an aggregation group to form an active/standby relationship. After the traffic is removed from the primary link, the local link is shut down. The local laser is delayed. The master sends the traffic from the master, and the switch internally switches the aggregation group through the software. After the switchover is complete, the original aggregation group becomes the master, and then the traffic is sent out from the standby link. The upstream traffic does not lose packets, and finally the local laser is turned off and the opposite laser is turned off. As shown in Figure 12, when the peer laser is turned off, the peer laser is turned off and the traffic is still sent from the primary link. The aggregation group is notified inside the switch to perform the active/standby switchover. After the original backup link becomes the new primary link, traffic is switched over to ensure that the downstream traffic does not drop packets. Finally, the opposite end laser is turned off and the local laser is turned off. Both ports are down.

Scene 2:

The hardware module includes two routers. The routers are connected by two pairs of fibers. The active and standby routes are configured to perform active/standby protection, as shown in Figure 10.

The processing steps in the process section are as follows:

As shown in Figure 11, the router is configured with the active/standby relationship. After the traffic is removed from the primary link, the local link is shut down, and the local laser is delayed. The main link status remains dominant. Let the traffic still be sent from the master, and the router internally performs the active/standby switchover through the software. After the switch is completed, the original route becomes the master, and then the traffic is sent out from the standby link. The traffic does not drop, and finally the local laser is turned off and the opposite laser is turned off. The method of not dropping packets in the downlink is as shown in Figure 12. When the peer laser is turned off, the backlight of the peer laser is turned off, so that the traffic is still sent from the primary link, and the router is notified of the route to perform the active/standby switchover. After the original backup link becomes the new primary link, traffic is switched over to ensure that the downstream traffic does not drop packets. Finally, the opposite end laser is turned off and the local laser is turned off, so that both ports are down.

Scene 3:

The hardware module includes two routers. The routers are connected by two pairs of optical fibers. The tunnel HSB is configured to perform active/standby protection, as shown in Figure 10.

The processing steps in the process section are as follows:

As shown in Figure 11, the HSB of the tunnel is configured to form an active/standby relationship. After the traffic is removed from the primary link, the local link is shut down. The local laser is delayed. The main link of the HSB is still maintained. The master, the traffic is still sent from the master, and the router internally performs the HSB switching of the tunnel through the software. After the handover is completed, that is, the backup link of the original tunnel HSB becomes the primary link, and then the traffic is sent again from the standby link. Go out, so that the upstream traffic does not lose packets, and finally turn off the local laser and the opposite laser to receive light. The method of not dropping packets on the downlink is as shown in Figure 12. When the peer laser is turned off, the backlight of the peer laser is turned off, so that the traffic is still sent from the main link. The internal aggregation switch is configured to perform the active/standby switchover. After the original standby link becomes the new primary link, traffic is switched over to ensure that the downstream traffic does not drop packets. Finally, the opposite end laser is turned off and the local laser is turned off, so that both ports are down.

This embodiment provides a process for switching between the active and standby links in different scenarios. In this embodiment, the method of turning off the local end or the opposite end laser after the completion of the switching between the active and standby links can ensure the original primary link. The traffic does not drop packets to the peer or the local end. The traffic is not lost during the active/standby link switching.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

S1, determining that the first data that is sent by the first network element is not received from the first link in the first predetermined time, where the first link is further used to send the second data to the first network element;

S2. Send the second data by using the second link.

S3. After sending the second data by using the second link, stop sending the second data by using the first link.

Optionally, the storage medium is further arranged to store program code for performing the following steps:

S1, when the first data is sent to the second network element by using the first link, determining that the first data needs to be sent to the second network element by using the second link;

S2. Send the first data to the second network element by using the second link.

S3. After sending the first data by using the second link, stop sending the first data by using the first link.

Optionally, in the embodiment, the foregoing storage medium may include, but is not limited to, a USB flash drive, a Read-Only Memory (ROM), and a Random Access Memory (RAM). A variety of media that can store program code, such as a hard disk, a disk, or an optical disk.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

Obviously, those skilled in the art should understand that the above modules or steps of the embodiments of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed in multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Industrial applicability

In the embodiment of the present invention, before the second data is sent through the second link, it is determined that the first data is not received from the first link within the first predetermined time, and then the second data is stopped by using the first link, which can be guaranteed. Before the data is transmitted by using the second link, the data on the first link is received without packet loss, which solves the problem that data packet loss occurs during link switching in the related art, thereby achieving active/standby link switching. The technical effect of the complete transmission of data in the process.

Claims

A data transmission method includes:

When the second data is sent to the first network element by using the first link, determining that the first data sent by the first network element is not received from the first link within the first predetermined time

Transmitting the second data by using a second link;

After transmitting the second data by using the second link, stopping sending the second data by using the first link.
The method of claim 1, wherein the stopping the transmitting of the second data using the first link comprises:

Turning off the laser of the first link for transmitting the second data.
The method according to claim 1, wherein after the determining, by the first predetermined time, that the first data sent by the first network element is not received from the first link, the method further comprises:

Turning off the laser of the first link for receiving the first data.
A data transmission method includes:

When the first data is sent to the second network element by using the first link, determining that the first data needs to be sent to the second network element by using the second link;

Transmitting, by the second link, the first data to the second network element;

After transmitting the first data by using the second link, stopping sending the first data by using the first link.
The method of claim 4, wherein the stopping the transmitting the first data by using the first link comprises:

Turning off the laser of the first link for transmitting the first data.
The method according to claim 4, wherein when the second data transmitted by the second network element is received by using the first link, the utilizing the second link to the second network element After the sending the first data, the method further includes:

Determining that the second network element is not received from the first link within a second predetermined time Describe the second data;

Stopping, by using the first link, the second data sent by the second network element.
The method of claim 6, wherein the stopping receiving the second data sent by the second network element by using the first link comprises:

Turning off the laser of the first link for receiving the second data sent by the second network element.
A data transmission device comprising:

The first determining module is configured to: when the first data is sent to the first network element by using the first link, determine that the first data that is sent by the first network element is not received from the first link in the first predetermined time;

a first sending module, configured to send the second data by using a second link;

The first stopping module is configured to stop sending the second data by using the first link after the first sending module sends the second data by using the second link.
The apparatus of claim 8 wherein said first stop module comprises:

a first shut down unit configured to turn off the laser of the first link for transmitting the second data.
The apparatus of claim 8 further comprising:

And closing the module, configured to close the first chain after the first determining module determines that the first data sent by the first network element is not received from the first link within a first predetermined time A laser for receiving the first data.
A data transmission device comprising:

a second determining module, configured to: when the first data is sent to the second network element by using the first link, determine that the first data needs to be sent to the second network element by using the second link;

a second sending module, configured to send the first data to the second network element by using the second link;

The second stopping module is configured to stop sending the first data by using the first link after the second sending module sends the first data by using the second link.
The apparatus of claim 11 wherein said second stop module comprises:

a second closing unit, configured to close the first link for sending the first data Light.
The apparatus of claim 11 further comprising:

a third determining module, configured to: when the second data sent by the second network element is received by using the first link, use, by the second sending module, the second link to the second network element After transmitting the first data, determining that the second data that is sent by the second network element is not received from the first link within the second predetermined time;

And a third stopping module, configured to stop receiving, by using the first link, the second data sent by the second network element.
The apparatus of claim 13 wherein said third stop module comprises:

And a third closing unit configured to turn off the laser of the first link for receiving the second data.