CN106850261B - Network equipment and data transmission method - Google Patents

Abstract

Embodiments of the present invention provide a network device and a data transmission method. The network equipment includes a main control board, a switching network board, and a line interface processing unit LPU single board; the LPU single board is used to input data and/or output data. The port is connected to the switching network board through a direct channel ; The main control board is connected to the LPU single board and the switching network board, and is used to control the data input on the LPU single board in the case of failure of the network processor NP of the LPU single board, via the input The direct connection channel between the port of the data and the switching network board is transmitted to the switching network board, so that the network device can transmit the data to the switching network board for data transmission processing.

Description

Network equipment and data transmission method

technical field

The present invention relates to the field of communication technologies, and in particular, to a network device and a data transmission method.

Background technique

With the development of cloud computing, big data, mobile Internet and the Internet of Things, higher requirements are put forward for the reliability and effectiveness of data processing by network equipment.

Generally, a network device includes a switch fabric unit (Switch Fabric Unit, SFU) and multiple line interface processing unit (Line interface processing unit, LPU) boards, and data transmission is performed between the multiple LPU boards through the SFU. The LPU single board includes a network processor (Network Processor, NP) for controlling data transmission and multiple ports for inputting data and/or outputting data. The data input to the LPU board through the port can only be transmitted to the SFU through the NP. For example, in Figure 1, the data is input through the port 1 on the LPU1, and is transmitted to the SFU through the NP1 of the LPU1, and is transmitted to the LPU2 through the processing of the SFU. And it is transmitted to port 2 on LPU2 through NP2 of LPU2, and output through port 2.

It can be seen from the above description that if the NP on the LPU board fails, the network device cannot perform data transmission processing.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a network device and data transmission, so that in the case of an NP failure on an LPU board, the network device can transmit data to a switching network board for data transmission processing.

In a first aspect, a network device is provided. The network device includes a main control board, a switching network board, and an LPU single board. The LPU single board includes a port for inputting data and/or outputting data and a network processor NP for controlling data transmission. The port on the LPU single board for inputting data and/or outputting data is connected with the switching fabric board through a direct connection channel. The main control board is connected to the LPU board and the switching network board, and is used to control the data input on the LPU board in the case of the NP failure of the LPU board, and communicate with the LPU board through the port through which the data is input. The direct connection channel between the switch fabric boards is transmitted to the switch fabric board, so that the network device can transmit data to the switch fabric board for data transmission processing.

The number of LPU boards is at least two, and each LPU board includes at least one port for inputting data and/or outputting data.

In a possible design, the LPU single board includes a first LPU single board and a second LPU single board. The flow entry in the second NP of the second LPU board is stored in the first NP of the first LPU board. The flow entry in the first NP of the first LPU board is stored in the second NP of the second LPU board.

The main control board is specifically used to control the data input to the first LPU board when the first NP of the first LPU board fails, through the direct connection between the port through which the data is input and the switching network board The channel is transmitted to the switch fabric board, and the switch fabric board is controlled to transmit the data to the second NP of the second LPU board. The second LPU board transmits the data and the flow table entry matching the data to the switching fabric board through the second NP. The switching fabric board forwards the data according to the flow entry matching the data. Through this implementation, the data input to the faulty LPU board can be transmitted based on the flow entry stored in the NP.

Wherein, if it is determined that the port that outputs the data is the port of the first LPU board according to the flow table entry matching the data, the switching network board passes the direct connection channel between the switching network board and the port that outputs the data. , and output the data to the port on the first LPU board for outputting the data. If it is determined according to the flow table entry that matches the data, the port that outputs the data is the port of the second LPU board, the switching fabric board is connected to the port that outputs the data through the first port on the second LPU board. Two NPs, outputting the data to a port on the second LPU board for outputting the data.

In another possible design, the LPU single board further includes a third LPU single board; the main control board is also used for: if it is determined that the load of the third NP in the third LPU single board is smaller than that of the second LPU single board; NP, control the third LPU board to save the flow entry in the third NP, and control the switching fabric board to transmit the data to the third NP.

The main control board is further configured to: control the second LPU board to delete the flow entry of the first NP saved in the second NP, so as to release the storage resources of the second NP and reduce the second The load of the LPU board.

In a second aspect, a data transmission method is provided. In this method, the network device obtains the data to be transmitted. In the event that the first NP of the LPU board of the first line interface processing unit that transmits the data to be transmitted is determined to be faulty, use the direct connection channel between the port on the first LPU board to input the data and the switching network board The data to be transmitted is transmitted, so that the network device can perform data transmission processing and can transmit the data to the switching network board for data transmission processing.

In a possible design, after the network device transmits the data to be transmitted through the direct channel between the port on which the data is input on the faulty LPU board and the switching network board, the network device transmits the data to be transmitted. The data to be transmitted is transmitted to the second NP of the second LPU board, so that the data input to the faulty LPU board can be transmitted based on the flow entry stored in the NP. The flow entry in the first NP of the first LPU board is stored in the second NP of the second LPU board.

In another possible design, after the network device transmits the data to be transmitted through the direct connection channel between the port on the first LPU board for inputting the data and the switching network board, if it is determined that the third LPU single board If the load of the third NP in the board is smaller than the load of the second NP, the flow entry in the first NP of the first LPU is saved in the third NP of the third LPU board . The network device transmits the data to be transmitted to the third NP in the third LPU board, so as to balance the load among the LPU boards.

In yet another possible design, the network device may delete the flow entry in the first NP of the first LPU that is stored in the second NP of the second LPU to release the storage of the second NP. resources to reduce the load on the second LPU board.

In a third aspect, a data transmission device is provided, the data transmission device has all the functions for realizing the above load balancing processing method. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. The modules may be software and/or hardware.

In a possible design, the data transmission device includes a receiving unit and a processing unit, and the functions of the receiving unit and the processing unit may correspond to the steps of each method, which will not be repeated here.

In the network device and the data transmission method provided by the embodiments of the present invention, the port on the LPU board for inputting data and/or outputting data in the network device is connected to the switching network board through a direct channel, so if the LPU board is If the NP fault occurs, the data on the input faulty LPU board can be transmitted to the switch fabric board through the direct connection channel between the port where the data is input and the switch fabric board, so that the network device can transmit the data to the switch fabric board. Data transfer processing.

Description of drawings

Fig. 1 is the schematic diagram that network equipment transmits data through NP;

2 is a schematic structural diagram of a networking architecture provided by an embodiment of the present invention;

3 is a schematic structural diagram of a network device provided by an embodiment of the present invention;

4 is a schematic diagram of a data transmission path in a network device provided by an embodiment of the present invention;

5 is another schematic diagram of a data transmission path in a network device according to an embodiment of the present invention;

6 is another schematic diagram of a data transmission path in a network device provided by an embodiment of the present invention;

7 is a flowchart of a data transmission method provided by an embodiment of the present invention;

FIG. 8 is a flowchart of another data transmission method provided by an embodiment of the present invention;

FIG. 9 is a flowchart of another data transmission method provided by an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a schematic structural diagram of a networking architecture provided by an embodiment of the present invention. Referring to FIG. 2, the networking architecture includes data sending devices 110a and 110b, a backbone network 120, a broadband remote access server (BRAS) 130 and data receiving devices 140a, 140b and 140c. The backbone network 120 may include multiple network devices for data transmission. The plurality of network devices includes router 120a, router 120b, router 120c, and router 120d.

Each data transmitting device in FIG. 2 can communicate with each data receiving device. The data sending device 110a transmits the data packet to the BRAS 130 through network devices such as the router 120a, the router 120b, the router 120c, and the router 120d in the backbone network 120. The BRAS 130 forwards the data to the data receiving device 140a.

In FIG. 2 , when network devices such as router 120a, router 120b, router 120c, and router 120d included in backbone network 120 perform data transmission, there is a “if the NP on the LPU board fails, the network device will Data transfer processing is not possible" technical problem.

An embodiment of the present invention provides a network device, in which a port on an LPU board for inputting data and/or outputting data is connected to a switching network board through a direct channel, so if the port on the LPU board is If the NP is faulty, the network device can control the data on the input faulty LPU board, and transmit the data to the switch fabric board through the direct connection channel between the input port and the switch fabric board, so that the network device can transmit data to the switch fabric board. , for data transmission processing.

FIG. 3 shows a schematic structural diagram of a network device 100 provided by an embodiment of the present invention. Referring to FIG. 3 , the network device 100 includes a main control board 101 , a switching network board 102 and an LPU board 103 . The LPU board 103 includes a port 1031 for inputting data and/or outputting data and a network processor NP1032 for controlling data transmission. The port 1031 on the LPU board 103 for inputting data and/or outputting data is connected to the switch fabric board 102 through a direct connection channel 104 . The main control board 101 is connected to the LPU board 103 and the switch fabric board 102, and is used to control the data input on the LPU board 103 through the input in the event of a failure of the NP1032 of the LPU board 103. The direct connection channel 104 between the port 1031 of the data and the switch fabric board 102 is transmitted to the switch fabric board 102 .

In the embodiment of the present invention, the number of LPU boards 103 included in the network device 100 is at least two, and each LPU board 103 includes at least one port 1031 for inputting data and/or outputting data. Each port 1031 used for inputting data and/or outputting data in each LPU board 103 is connected to the switch fabric board through a direct connection channel 104 . When the NP of the LPU board 103 is faulty, the data on the inputted LPU board 103 is transmitted to the switch fabric board 102 through the direct connection channel 104 between the port 1031 where the data is input and the switch fabric board 102 .

Wherein, each LPU board 103 further includes a network processor NP1032 for controlling data transmission, and NP1032 stores flow entries for controlling data transmission. When the NP1032 is in a normal working state, each port 1031 used for inputting data and/or outputting data in each LPU board 103 can communicate with the NP1032, and the data can be transmitted to the switch fabric board via the port 1031 and through the NP1032 102.

It should be noted that, in FIG. 3 according to the embodiment of the present invention, a direct connection channel 104 is respectively established between each port 1031 of the LPU board 103 for inputting data and/or outputting data and the switching fabric board 102 for schematic illustration. In the actual implementation process, it is not limited to establish a direct connection channel 104 between each port 1031 and the switch fabric board 102. For example, multiple ports 1031 that can communicate with the NP1032 can be connected to the switch fabric board 102 through a direct connection channel 104. .

In the network device provided by the embodiment of the present invention, the port used for inputting data and/or outputting data on the LPU board is connected to the switching network board through a direct connection channel. Therefore, if the NP on the LPU board fails, the network The device can control the data on the input faulty LPU board, and transmit the data to the switch fabric board through the direct connection channel between the port where the data is input and the switch fabric board, so that the network device can transmit the data to the switch fabric board for data transmission processing. . In addition, in the embodiment of the present invention, when the NP on the LPU board fails, ports on other LPU boards are not occupied, so that the number of available ports is sufficient.

In the embodiment of the present invention, in order to enable the data input to the faulty LPU board to be transmitted based on the flow table entry saved in the NP, a backup LPU board can be set for each LPU board, and the backup LPU board can be used to save the data through the backup LPU board. The flow table entry stored in the NP of another LPU board. When the NP of the LPU board is faulty, the main control board can control the data input to the faulty LPU board, through the input port and the switch fabric board. The direct connection channel between them is transmitted to the switch fabric board, and the switch fabric board is controlled to transmit the data to the NP of the backup LPU board of the faulty LPU board, and then the backup LPU board of the faulty LPU board. The data and the flow entry matching the data are transmitted to the switching fabric board through the NP of the backup LPU board; the switching fabric board forwards the data according to the flow entry matching the data.

The embodiments of the present invention are described below by taking an example that an LPU board in a network device includes a first LPU board and a second LPU board. The flow entry in the first NP of the first LPU board is stored in the second NP of the second LPU board. The flow entry in the second NP of the second LPU board is stored in the first NP of the first LPU board.

When the first NP of the first LPU board is faulty, the main control board controls the data input to the first LPU board, and transmits the data to the switch through the direct connection channel between the port through which the data is input and the switch fabric board The network board, and controls the switching network board to transmit the data to the second NP of the second LPU board. The second LPU board transmits the data and the flow table entry matching the data to the switching fabric board through the second NP. The switching fabric board forwards the data according to the flow entry matching the data.

When the second NP of the second LPU board fails, the main control board controls the data input to the second LPU board, and transmits the data to the switch via the direct connection channel between the port through which the data is input and the switch fabric board The network board, and controls the switching network board to transmit the data to the first NP of the first LPU board. The first LPU board transmits the data and the flow entry matching the data to the switching fabric board through the first NP. The switching fabric board forwards the data according to the flow entry matching the data.

In FIG. 4 , a process of data transmission through the NP (first NP) of the backup LPU board (first LPU board) is schematically illustrated by taking the second NP failure of the second LPU board as an example. In the case where the first NP of the first LPU board fails, the process of data transmission through the second NP of the second LPU board is similar, and details are not described herein again.

In the embodiment of the present invention, in the process of forwarding the data according to the flow entry matching the data, the switching network board may determine the port for outputting the data according to the flow entry matching the data. If it is determined according to the flow table entry matching the data that the port that outputs the data is the port of the faulty LPU board, the switching network board outputs the data through the direct channel between the switching network board and the port that outputs the data. The data is sent to the port on the faulty LPU board that outputs the data. If it is determined according to the flow table entry matching the data that the port that outputs the data is the port of the backup LPU board of the faulty LPU board, the data is output through the NP of the backup LPU board of the faulty LPU board The port that outputs the data on the backup LPU of the faulty LPU.

In the case where the first NP of the first LPU board is faulty, if it is determined according to the flow table entry matching the data that the port that outputs the data is the port of the first LPU board, the switch fabric board passes the switch fabric board through the switch fabric board. A direct-connected channel with the port outputting the data, and outputting the data to the port outputting the data on the first LPU single board. If it is determined according to the flow table entry that matches the data, the port that outputs the data is the port of the second LPU board, the switching fabric board is connected to the port that outputs the data through the first port on the second LPU board. Two NPs, outputting the data to a port on the second LPU board for outputting the data.

When the second NP of the second LPU board is faulty, if it is determined according to the flow table entry matching the data that the port that outputs the data is the port of the second LPU board, the switching network board passes the switching network board through the switching network board. A direct-connected channel with the port outputting the data, and outputting the data to the port outputting the data on the second LPU board. If it is determined according to the flow table entry matching the data that the port that outputs the data is the port of the first LPU board, the switching fabric board is connected to the port that outputs the data through the first LPU board. An NP, outputting the data to the port on the first LPU board for outputting the data.

In FIG. 5 , the process of forwarding the data by the switching network board according to the flow table entry matching the data is described by taking the second NP failure of the second LPU board as an example. In FIG. 5 , the second NP of the second LPU board is faulty, and the network device determines that the port that outputs the data is the port of the second LPU board according to the flow table entry matching the data, and the switching network board passes the switching The direct connection channel between the network board and the port outputting the data outputs the data to the port outputting the data on the second LPU board.

In the embodiment of the present invention, by setting a backup LPU board for each LPU board in the network device, in the case of any LPU board failure, the data transmission based on the flow entry in the NP can be realized. deal with.

In the embodiment of the present invention, when the NP of the LPU board is faulty, the main control board controls the data input to the faulty LPU board, and transmits the data to the switch network board through the direct connection channel between the port through which the data is input and the switching network board. switch fabric board, and control the switch fabric board to transmit the data to the NP of the backup LPU board of the faulty LPU board, and perform data transmission processing through the backup LPU board of the faulty LPU board. The backup LPU board of the LPU board currently processes more services, which may cause a large forwarding load on the backup LPU board of the faulty LPU board. In this embodiment of the present invention, in order to balance the load among the LPU boards, the main control board of the network device may control the switching network board to transmit the data to the backup LPU board of the faulty LPU board. Before NP, determine the load of each LPU board. If it is determined that there is an LPU board whose load is smaller than the load of the backup LPU board of the faulty LPU board, you can control the load of the LPU board of the network device to be less than that of the faulty LPU board. The backup LPU board of the board The LPU board loaded by the board saves the flow entry in the NP of the faulty LPU board to the NP of the LPU board whose load is smaller than the backup LPU board of the faulty LPU board, and controls The switching fabric board transmits the data of the faulty LPU board to the NP of the LPU board whose load is smaller than that of the backup LPU board of the faulty LPU board.

In the embodiment of the present invention, after the main control board controls the switching network board to transmit the data of the faulty LPU board to the NP of the LPU board whose load is smaller than the load of the backup LPU board of the faulty LPU board, it can control the faulty LPU board The backup LPU of the single board deletes the flow table entries in the NP of the faulty LPU board saved in the NP of the backup LPU of the faulty LPU board to release the storage resources of the second NP and reduce the storage resources of the second LPU board. load.

In the embodiment of the present invention, the LPU single board includes a first LPU single board, a second LPU single board, and a third LPU single board as an example for description.

It is assumed that the first NP of the first LPU board is faulty, and the second NP of the second LPU board stores the flow entry in the first NP of the first LPU board. If the main control board determines that the load of the third NP in the third LPU board is smaller than that of the second NP, it controls the third LPU board to save the flow entry in the third NP, and control the switching fabric board to transmit the data to the third NP, and a schematic diagram of a data transmission path is shown in FIG. 6 .

In the embodiment of the present invention, the main control board of the network device may further control the second LPU board to delete the flow entry of the first NP stored in the second NP.

Based on the network device provided by the foregoing embodiment, the embodiment of the present invention provides a data transmission method.

FIG. 7 shows a schematic flowchart of a data transmission method provided by an embodiment of the present invention. As shown in Figure 7, including:

S101: The network device obtains data to be transmitted.

In this embodiment of the present invention, the network device may be obtained through a port on the first LPU board for inputting data.

S102: The network device determines that the first NP of the first LPU board that transmits the to-be-transmitted data is faulty.

S103: The network device transmits the to-be-transmitted data through a direct connection channel between the port on the first LPU board where the data is inputted and the switching network board.

In the data transmission method provided by the embodiment of the present invention, in the case of a failure of the first NP on the first LPU board that transmits the data to be transmitted, the data transmission between the port on the first LPU board and the switching network board can be used to input the data. The direct connection channel transmits the data to be transmitted, so that the network device can perform data transmission processing and can transmit the data to the switching network board for data transmission processing.

FIG. 8 shows a flowchart of another data transmission method provided by an embodiment of the present invention. The data transmission method shown in FIG. 8 further includes the following steps on the basis of the transmission method shown in FIG. 7 :

S104: The network device transmits the data to be transmitted to the second NP of the second LPU board. The flow entry in the first NP of the first LPU board is stored in the second NP of the second LPU board.

In the embodiment of the present invention, by transmitting the data to be transmitted to the second NP of the second LPU board, the data input to the faulty LPU board can be transmitted based on the flow entry stored in the NP.

FIG. 9 shows a flowchart of another data transmission method provided by an embodiment of the present invention. The data transmission method shown in FIG. 9 further includes the following steps on the basis of the transmission method shown in FIG. 7 :

S104: Determine whether the load of the third NP in the third LPU board is smaller than the load of the second NP in the second LPU board.

S105: If it is determined that the load of the third NP in the third LPU board is smaller than the load of the second NP, save the load of the first LPU board in the third NP of the third LPU board flow entry in the first NP, and transmit the to-be-transmitted data to the third NP in the third LPU board.

S106: If it is determined that the load of the third NP in the third LPU board is smaller than that of the second NP, transmit the to-be-transmitted data to the second NP of the second LPU board. The flow entry in the first NP of the first LPU board is stored in the second NP of the second LPU board.

In this embodiment of the present invention, when it is determined that the load of the third NP in the third LPU board is smaller than the load of the second NP, the first LPU is stored in the third NP of the third LPU board The flow table entry in the first NP of the single board, and the data to be transmitted is transmitted to the third NP of the third LPU single board, which can reduce the load of the second LPU single board and make the LPU single board load balancing between.

Based on the data transmission method provided above, an embodiment of the present invention further provides a data transmission apparatus. It can be understood that, in order to realize the above-mentioned functions, the data transmission apparatus includes corresponding hardware structures and/or software modules for executing each function. With reference to the units and algorithm steps of each example described in the embodiments disclosed in the present invention, the embodiments of the present invention can be implemented in hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of the technical solutions of the embodiments of the present invention.

In this embodiment of the present invention, the data transmission apparatus may be divided into functional units according to the foregoing method examples. For example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units. It should be noted that, the division of units in the embodiment of the present invention is schematic, and is only a logical function division, and there may be other division manners in actual implementation.

In the case of using an integrated unit, FIG. 10 shows a schematic structural diagram of a data transmission device. Referring to FIG. 10, the data transmission apparatus 1000 includes an acquisition unit 1001 and a processing unit 1002, wherein the acquisition unit 1001 is used for acquiring data to be transmitted. The processing unit 1002 is configured to, when it is determined that the first NP of the first LPU board that transmits the data to be transmitted acquired by the acquiring unit 1001 is faulty, use the port and the switch fabric board to input the data on the first LPU board The data to be transmitted is transmitted through the direct channel between them.

In a possible implementation manner, the processing unit 1002 is further configured to transmit the to-be-transmitted data through a direct channel between the port on which the data is input on the faulty LPU board and the switching network board, and then transfer the data to be transmitted. The data to be transmitted is transmitted to the second NP of the second LPU board. The flow entry in the first NP of the first LPU board is stored in the second NP of the second LPU board.

In another possible implementation manner, the processing unit 1002 is further configured to transmit the data to be transmitted through the direct connection channel between the port on the first LPU board for inputting the data and the switching network board, if It is determined that the load of the third NP in the third LPU board is smaller than the load of the second NP, then save the first NP of the first LPU board in the third NP of the third LPU board The flow table entry in , transmits the to-be-transmitted data to the third NP in the third LPU board.

When implemented in the form of hardware, the data transmission apparatus 1000 may be the network device involved in the above embodiments.

It should be noted that the data transmission apparatus 1000 provided by the embodiment of the present invention has the functions of the network equipment involved in the above-mentioned embodiments, and the function of the processing unit 1002 may correspond to the function of the main control board in the network equipment, which is not discussed here. For details where the description of the embodiments of the present invention is not detailed enough, reference may be made to the relevant descriptions of the above-mentioned embodiments, and details are not described herein again in the embodiments of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (10)

1. A network device is characterized by comprising a main control board, a switching network board and a line interface processing unit (LPU) single board;

the port used for inputting data on the LPU single board is connected with the exchange network board through a direct connection channel;

the main control board is connected with the LPU single board and the switching network board, and is used for controlling and inputting data on the LPU single board under the condition that a network processor NP of the LPU single board fails, and transmitting the data to the switching network board through a direct connection channel between a port for inputting the data and the switching network board.

2. The network device of claim 1, wherein the LPU board comprises a first LPU board and a second LPU board;

a second NP of the second LPU board stores a flow entry in a first NP of the first LPU board;

the main control board is specifically configured to, in the event of a failure of a first NP of a first LPU board, control data input to the first LPU board, transmit the data to the switching network board via a direct connection channel between a port through which the data is input and the switching network board, and control the switching network board to transmit the data to a second NP of a second LPU board;

the second LPU board transmits the data and the flow table entry matched with the data to the switch network board through the second NP;

the switching network board is also used for forwarding the data according to the flow table item matched with the data.

3. The network device according to claim 2, wherein a port on the LPU board for outputting data is connected to the switch board through a direct connection channel;

when the switch web board forwards the data according to the flow table entry matched with the data, the switch web board is specifically configured to:

if the port for outputting the data is determined to be the port of the first LPU single board according to the flow table item matched with the data, the switching network board outputs the data to the port for outputting the data on the first LPU single board through a direct connection channel between the switching network board and the port for outputting the data.

4. The network device of claim 2, wherein when the switch board forwards the data according to the flow table entry matched with the data, the switch board is specifically configured to:

if the port for outputting the data is determined to be the port of the second LPU board according to the flow table entry matched with the data, the switching network board outputs the data to the port for outputting the data on the second LPU board through a second NP connected with the port for outputting the data on the second LPU board.

5. The network device according to any one of claims 2 to 4, wherein the LPU single board further comprises a third LPU single board;

the main control board is also used for:

if the load of a third NP in a third LPU single board is smaller than the second NP, controlling the third LPU single board to store the flow table entry into the third NP, and controlling the switching network board to transmit the data to the third NP.

6. The network device of claim 5, wherein the master board is further to:

and controlling the second LPU single board to delete the flow table entry of the first NP stored in the second NP.

7. The network device of claim 2, wherein a first NP of the first LPU board stores a flow entry in a second NP of the second LPU board.

8. A method of data transmission, comprising:

the network equipment acquires data to be transmitted;

the network equipment determines that a first network processor NP of a first line interface processing unit (LPU) single board for transmitting the data to be transmitted has a fault;

and the network equipment transmits the data to be transmitted through a direct connection channel between the port for inputting the data on the first LPU single board and the exchange network board.

9. The method according to claim 8, wherein after the network device transmits the data to be transmitted through a direct channel between a port of the failed LPU board, where the data is input, and a switch board, the method further includes:

the network equipment transmits the data to be transmitted to a second NP of a second LPU single board;

wherein, the second NP of the second LPU board stores the flow entry in the first NP of the first LPU board.

10. The method of claim 9, wherein after the network device transmits the data to be transmitted through a direct channel between a port on the first LPU board, where the data is input, and a switch board, the method further includes:

if it is determined that the load of a third NP in a third LPU single board is smaller than the load of the second NP, saving a flow entry in a first NP of the first LPU single board in the third NP of the third LPU single board;

and the network equipment transmits the data to be transmitted to a third NP in the third LPU single board.

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