CN102420706B - Management board in switch and switch - Google Patents

Abstract

The invention discloses a management board in a switch and the switch. The management board comprises a first management control unit and a second management control unit, wherein a main voltage in a switching power supply in the switch supplies power to the first management control unit; the first management control unit is used for supervising the operating state of the switch; a bypass voltage in the switching power supply in the switch supplies power to the second management control unit; and the second management control unit is used for controlling the switching power supply in the switch to use the main voltage to energize and de-energize the switch. By adoption of the scheme, the switch can be effectively controlled to be energized and de-energized, and operation efficiency and accuracy are quite high.

Description

A management board arranged in a switch and the switch

technical field

The invention relates to the technical field of network equipment, in particular to a management board arranged in a switch and a switch.

Background technique

Existing switch mainly comprises components and parts such as management board, line card, switching power supply, can have two management boards, a plurality of line cards and switching power supply in switchboard, each line card 10 and switching power supply 11 and management board 12, The connection relationship of 13 is shown in FIG. 1, and the management board and the line card may be collectively referred to as a board. Wherein, each Electrically Erasable Programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM) 14 is used to store the information of its own board, such as board type, power consumption, etc.; the temperature monitoring chip 15 is used to monitor The temperature of its own environment, these two chips are accessed through the IIC interface. The two management boards of the switch will carry out master-slave negotiation, one negotiates as the master management board, and the other negotiates as the slave management board. The multiplexer 16 is used to select the IIC channel of the master management board to connect to the EEPROM 14 and the temperature monitoring chip 15. Since the general central processing unit 17 (Central Processing Unit, CPU) has only 1-2 IIC channels, and there are multiple line cards and switching power supplies in the switch, it is necessary to expand the IIC bus of the CPU through the I2C bus switch 18 to multiple Road IIC bus. A complex programmable logic device (Complex Programmable Logic Device, CPLD) 19 is used to transmit status and control information between the management board and the line card, between the management board and the switching power supply, such as whether the line card exists, reset the line card and other information.

In the switch shown in Figure 1, the CPU on the management board monitors the switching power supply, and the normal working voltage of the management board is converted from the main output voltage provided by the switching power supply. The management board can control each The board performs power-on and power-on operations, but it cannot control the switching power supply to perform power-on and power-on operations on the switch. The switch can only be powered on and off manually. When the number of switches is very large, the efficiency of the power-on and power-on operations of the switches can be controlled manually. Very low, and the accuracy rate is also low. Therefore, the prior art lacks a solution capable of effectively controlling the power-on/off operation of the switch.

Contents of the invention

Embodiments of the present invention provide a management board and a switch arranged in a switch, so as to effectively control power-on and power-off operations of the switch.

A management board set in a switch, comprising:

The first management control unit is powered by the main voltage in the switching power supply in the switch, and is used to supervise the running state of the switch;

The second management control unit is powered by the bypass voltage of the switching power supply in the switch, and is used to control the switching power supply in the switch to use the main voltage to power on and off the switch.

A switch, including the above-mentioned management board.

The management board provided in the switch and the switch provided by the embodiment of the present invention, the management board includes a first management control unit and a second management control unit; wherein the first management control unit is powered by the main voltage of the switching power supply in the switch The second management control unit is powered by the bypass voltage of the switching power supply in the switch, and is used to control the switching power supply in the switch to use the main voltage to power on and off the switch. In this solution, the second management control unit on the management board of the switch is powered by the bypass voltage of the switching power supply in the switch, and the output state of the bypass voltage of the switching power supply is always in an active state, that is to say, the second management The control unit can always be in the working state, so the second management control unit can directly control the switching power supply to use the main voltage to perform power-on and power-on operations on the switch. When the switch is in the power-off state, the second management control unit can use the main voltage through the switching power supply. Perform power-on operation on the switch; when the switch is in the power-on state, the second management control unit can use the main voltage to perform power-off operations on the switch through the switching power supply. The management board of this solution can effectively control the power-on and power-off operations of the switch. Since the prior art needs to manually control the power-on and power-off operation of the switch, the operation efficiency and accuracy can be effectively improved.

Description of drawings

FIG. 1 is a schematic diagram of a circuit principle of a switch in the prior art;

FIG. 2 is a schematic diagram of a circuit principle of a switch in an embodiment of the present invention;

FIG. 3 is a flow chart of the second management control unit performing a power-on operation on the switch by switching the power supply when the switch starts in the embodiment of the present invention;

Fig. 4 is the schematic diagram of the circuit for detecting the existence of the peer management board in the embodiment of the present invention;

FIG. 5 is a schematic diagram of connection of line cards in an embodiment of the present invention.

Detailed ways

In view of the lack of solutions in the prior art that can effectively control the power on and off of the switch, the embodiment of the present invention provides a management board, which can be installed in the switch, and its structure is shown in Figure 2. The management board 20 includes : the first management control unit 21 and the second management control unit 22 . in:

The above-mentioned first management control unit 21 is powered by the main voltage of the switching power supply in the switch, and is used to supervise the running state of the switch.

The above-mentioned second management control unit 22 is powered by the bypass voltage of the switching power supply in the switch, and is used to control the switching power supply 23 in the switch to use the main voltage to perform power-on and power-on operations on the switch.

The management control unit in the switch of the prior art can only supervise the running status of the switch, such as judging the units existing in the switch, and monitoring the working status of these units, for example, whether there is any abnormality, etc.; it cannot control the switching power supply to use the main voltage to The switch performs power-on and power-off operations, because the switching power supply supports outputting two voltages, one is the main voltage of 12V, and the other is the bypass voltage of 3.3V. The switching power supply can control the output of 12V voltage. For example, it can be controlled by the signal of the pin PSON# of the switching power supply. When the PSON# of the switching power supply is at high level, 12V is normally output. There is no output, of course, it can also be controlled by other methods, so I won’t go into details here; the output of the 3.3V bypass (Standby) voltage is not controlled by the switching power supply, as long as the 220V AC input exists, the 3.3V bypass voltage output exists . The 3.3V bypass voltage output current of a general switching power supply is relatively small, so it cannot supply devices with high power consumption.

In the present invention, the first management control unit is powered by the 12V voltage output by the switching power supply, and the second management control unit is powered by the 3.3V bypass voltage output by the switching power supply, because the 3.3V bypass voltage is not controlled by the switch Power control, that is to say, the second management control unit can always be in the working state, so the second management control unit can control the switching power supply to output a main voltage of 12V, and then control the switching power supply to use the main voltage to perform power-on and power-on operations on the switch. When the switch is in the power-off state, the second management control unit can perform a power-on operation on the switch through a switching power supply; when the switch is in a power-on state, the second management control unit can perform a power-off operation on the switch through a switching power supply. The management board in the switch can effectively control the power-on and power-off operations of the switch. Compared with the prior art that requires manual control of the power-on and power-off operations of the switch, the operation efficiency and accuracy have been effectively improved.

Of course, the 12V voltage output by the switching power supply is not only used to supply power to the first management control unit in the management board, but also used to supply power to other components such as line cards and fan trays in the switch. The 12V voltage output by the switching power supply will first pass through the management board. , Line cards, fan trays, etc., are hot-swappable controllers on these components, and then supply power to these components. The main function of the hot-swap controller is to protect the board from being damaged when it is plugged in with power.

Components such as management boards, line cards, and switching power supplies can be directly installed on the chassis of the switch, or two backplanes can be set on the switch, one for the power supply and one for the system, and the switching power supply can be installed on the power supply backplane Set the management board, line card, etc. on the system backplane, and the power supply backplane and the system backplane are connected by cables. Of course, other methods may also be used, which will not be repeated here.

The structure of the switch in the embodiment of the present invention is introduced above, and each unit and the corresponding working principle are described in detail below.

Specifically, as shown in FIG. 2, the above-mentioned first management control unit 21 includes a first CPU211 and a first CPLD212, and the second management control unit 22 includes a second CPU221 and a second CPLD222; 2. The CPLD222 controls the output state of the main voltage of the switch power supply 23 in the switch, so as to implement power-on and power-off operations on the switch.

The work to be done by the second CPU is relatively simple, as long as it can control the output state of the switching power supply through the first CPLD, so as to realize the power on and off operation of the switch. Therefore, when selecting the second CPU, it needs to be able to support one IIC bus As well as the asynchronous bus, since the CPU may implement a simple protocol, it needs to support external scalable SDRAM. If the selected second CPU can work normally at 3.3V, then you can directly use the 3.3V bypass voltage output by the switching power supply. If you need other voltages, you can convert the 3.3V bypass voltage output by the switching power supply. to get the required voltage.

In addition to PSON#, there are other interface signals of the existing switching power supply, such as PSRENT# indicating the existence of switching power supply (this signal can be set to low to indicate the existence of switching power supply, and high to indicate the existence of switching power supply), indicating the presence of switching power supply FAN FAIL# of internal fan status (this signal can be set low to indicate fan failure, high to indicate fan normal), PwrOK# indicating whether the output of the switching power supply is normal (this signal can be set to low to indicate that the output of the switching power supply is normal, and high to indicate Switching power supply output failure), etc., these signals can be connected to the second CPLD. One switching power supply can be used, or several can be used at the same time. When multiple switching power supplies are used, the second CPLD will output signals for each switching power supply, and then perform logic operations on the signals output by each switching power supply before executing the switch. For power on and off operation, using one switching power supply can achieve the same effect as using multiple switching power supplies, but the control of the power supply will be different. The following uses a switching power supply as an example to illustrate.

The communication connection between the second CPU and the second CPLD can be interconnected through an asynchronous bus, and the second CPU obtains signals such as whether the switching power supply exists through the second CPLD, and controls signals such as PSON# of the switching power supply. The asynchronous bus can use the CPU's serial peripheral interface (Serial Peripheral Interface, SPI), local bus (Local bus), or general purpose input and output (General Purpose Input Output, GPIO).

The second CPLD is connected to the signal output by the switching power supply, and outputs a PSON# signal to the switching power supply, which is used to control the output state of the switching power supply, thereby realizing the operation of powering on and off the switch.

The communication channel between the second CPU and the first management control unit may be a Universal Asynchronous Receiver Transmitter (UART).

Specifically, when the switch is started for the first time, the above-mentioned second CPU will execute the following steps, and the specific steps are shown in FIG. 3 .

S30: start.

S31: Detect whether there is a peer management board in the switch that has a master-slave relationship with the management board where it is located, and when the detection result does not exist, perform S32; when the detection result exists, perform S33.

S32: Control the output state of the main voltage of the switching power supply in the switch to the valid state through the second CPLD, so as to perform a power-on operation on the switch.

S33: Detect the current output state of the main voltage of the switching power supply. When it is detected that the output state of the main voltage is valid, execute S34; when it is detected that the output state of the main voltage is invalid, execute S35.

S34: Keep the output state of the main voltage of the switching power supply in a valid state.

S35: Determine the reason why the current output state of the main voltage of the switching power supply is an invalid state, if the reason is that the switch is started for the first time, execute S36; if the reason is artificial power failure, execute S37.

S36: The second CPLD controls the output state of the main voltage of the switching power supply in the switch to be in a valid state, so as to perform a power-on operation on the switch.

S37: Keep the output state of the main voltage of the switching power supply in an invalid state.

Generally, in a switch, two management boards are set up. After negotiation, one of the two management boards can be used as the main management board, and the other can be used as the slave management board. When the master management board fails, the slave management board can take over the work of the master management board. , the switch can still operate normally. Therefore, when the switch starts to start, the management board needs to detect whether there is another management board, and then perform corresponding operations. The following three situations may exist when the switch is started:

Case 1: There is only one management board.

When the switch is started, in the presence of the 220V input of the switching power supply, the 3.3V voltage is normally output, and the second management control unit can be started normally, and the second CPU detects whether the peer management board exists through the second CPLD, because only the second The management board where the management control unit itself is located, so the peer management board does not exist, then the second CPU can directly control the output state of the switching power supply to be in an active state through the second CPLD, that is, the 12V voltage is normally output, so that the second CPU on the management board A management control unit can be started normally. After the first management control unit starts normally, the management board where the first management control unit is located naturally serves as the main management board.

The second case: There is only one management board when the switch is started, and the second management board is inserted after the switch is started.

The management board that exists when the switch starts has the same control over the switching power supply as in the first case, and the second CPU in the management board that is inserted later will also check whether the peer management board exists. The board is broken, the switching power supply may be turned off artificially, or it may output normally. Therefore, it is necessary to obtain the output state of the switching power supply at this time, which can be obtained by reading the PwOK# signal in this embodiment.

If the PwOK# signal is low, it means that the second management control unit of the peer management board has controlled the output state of the switching power supply to be in the valid state, realizing the power-on operation of the switch, and the peer management board is already in the position of the main management board At this time, since the 12V power supply already exists normally, the CPU inserted into the management board can be started directly, and the master-slave negotiation will be made as the slave management board.

If the PwOK# signal is high, it means that the output status of the switching power supply is invalid, and there is no output of 12V voltage, which means that the switching power supply has been artificially turned off by the user. The power-on operation is performed.

Case 3: There are two management boards when the switch is started.

At this time, the second CPUs of the second management control units on the two management boards can be started normally, and both can detect the existence of the opposite management board, and then obtain the output status of the switching power supply.

If the obtained output status of the switching power supply is valid, the two management boards can start normally, and then the master-slave negotiation can be carried out, and one is the master management board and the other is the slave management board, and the switch can start to work normally.

If the obtained output state of the switching power supply is invalid, it means that the 12V voltage of the switching power supply has not been output. From the second case, we know that the output state of the switching power supply is in an invalid state. It may be artificially closed, and it may be a switch. For the first startup, if it is turned off intentionally, then the power-on operation cannot be performed, but if the switch is started for the first time, the power-on operation can be performed. Therefore, it is necessary to detect that the output status of the switching power supply is invalid. reason. If the reason is that the switch starts for the first time, the switching power supply output state in the switch is controlled by the second CPLD to be in an effective state, so that the switch is powered on; if the reason is an artificial power failure, the output state of the switching power supply is kept in an invalid state.

Preferably, when the switch is working normally, the above-mentioned first CPU sends a heartbeat signal to the second CPLD through the first CPLD; when the second CPU does not obtain the heartbeat signal sent by the first CPU through the second CPLD within the set time length to detect whether there is a peer management board that has a master-slave relationship with its own management board in the switch. If the detection result does not exist, the output state of the main voltage of the switching power supply in the switch is controlled by the second CPLD to be invalid first. The status is valid again, and the power-on operation is performed after the switch is powered off.

A kind of preferred implementation manner, can make the first CPU and the second CPU on the management board monitor the heartbeat signal of the other side at the same time, can pass the HBIN, HBOUT signal to each other through the first CPLD and the second CPLD Heartbeat signal, of course also can is another heartbeat signal. When the second CPU finds that the first CPU has no heartbeat signal, that is to say, the first management control unit cannot work normally, then the second CPU can detect whether the peer management board exists. If the peer management board does not exist, it can By controlling the output state of the switching power supply through the second CPLD to first be in an invalid state and then to be in a valid state, the switch can be powered off first and then powered on again, so that the management board can resume normal operation. If there is a peer management board, the peer management board will also monitor that this management board is not working properly, so the peer management board can ensure the normal operation of the entire system, so there is no need to perform power-on and power-off recovery.

Specifically, the above-mentioned second CPU is used to detect the cause flag bit that identifies the reason why the current output state of the switching power supply is invalid, and when the cause flag bit is detected to be 0, determine that the cause is that the switch is started for the first time.

The cause flag bit can be set in the second CPLD to identify the reason why the output state of the switching power supply is an invalid state. When the cause flag bit can be set to 0, it means that the switch is started for the first time, and when it is 1, it means that the switching power supply is turned off artificially. The cause flag bits can be exchanged between the second CPLDs in the second management control units of the two management boards through UART.

Under the situation that two management boards exist at the same time in the above-mentioned third case, the second CPU of the second management control unit in the two management boards can detect the cause flag bit of the other party, when both are 0, the two second The CPU can control the output state of the switching power supply to be in the valid state through the second CPLD of the management board where it is located. At this time, the output state of the switching power supply is in the valid state, and the 12V voltage is normally output. The first management control unit on the two management boards Start booting, then master-slave negotiation.

Preferably, when the switch is in a normal working state, it can also receive a power-off request. When receiving a power-off request, the first CPU sends a power-off request to the second CPU through the first CPLD and the second CPLD; the second CPU sends a power-off request according to the first CPU received through the second CPLD, detects Whether there is a peer management board having a master-slave relationship with the management board where itself is located in the switch, when the detection result does not exist, the output state of the main voltage of the switching power supply in the switch is controlled by the second CPLD to be in an invalid state, so as to realize the The switch performs a power-off operation; when the detection result is present, the received power-off request is forwarded to the opposite end management board, and the output state of the main voltage of the switching power supply in the switch is controlled by the second CPLD to be in an invalid state, so as to realize the The switch performs a power-off operation.

A communication channel can be set between the first CPU and the second CPU, so that the user can apply to control the output state of the switching power supply through the console of the management board, so as to implement the power-off operation on the switch.

Specifically, the above-mentioned second CPLD is connected with a detection contact for detecting whether there is a peer management board in the switch; the second CPU is used to confirm that there is The management board at the opposite end, and when it is detected that the detection contact is at a high level, confirm that there is no management board at the opposite end in the switch.

The circuit in Fig. 4 can be used to detect whether the peer management board exists, and the figure shows the situation where there are two management boards, A and B. For management board A, when the peer management board B exists, the detection contact A is low level, that is, the Present# signal in Figure 2 is low level; when the peer management board B does not exist, The detection contact A is at a high level, that is, the Present# signal in Fig. 2 is at a high level. The same is true for the management board B when the point B is detected. Here is just one way to detect the existence of the peer management board. Of course, other ways can also be used to detect the existence of the peer management board, which will not be repeated here.

Specifically, the above-mentioned second CPU is provided with a network communication interface; after the second CPU receives the user's power-on/off request through the network communication interface, it controls the output state of the switching power supply in the switch through the second CPLD to realize power-on/off of the switch. operate.

A network communication interface can be set on the second management control unit, through which the remote management of the switch can be realized, and with the support of corresponding software, the switch can be connected to a unified management platform to realize the unification of multiple switches manage.

The network communication interface can be a 100M electrical port or other interfaces. The following uses a 100M electrical port as an example for illustration. When the user sends a power-off request through the 100M electrical port, the second CPU sets the cause flag in the second CPLD to 1, and controls the output state of the switching power supply to be invalid. At the same time, check whether the peer management board exists. If the peer management board exists, the power-off request is transmitted to the second management control unit of the peer management board through the UART channel. After receiving the request, the second CPU of the peer management board , and also control the output state of the switching power supply to be invalid. When the second management control sheets of the two management boards both control the output state of the switching power supply to be invalid, the switching power supply will no longer output 12V voltage, which realizes powering off the switch. operate.

When a power-on request is received from the 100M electrical port, the second CPU sets the cause flag in the second CPLD to 0, and controls the output state of the switching power supply to be valid, and the switching power supply outputs a 12V voltage to implement power-on to the switch. Electrical operation; at the same time, it detects whether the opposite management board exists. If the opposite management board exists, the power-on request is transmitted to the second management control unit of the opposite management board through the UART channel, and the second CPU of the opposite management board receives it. After the power-on request, the output state of the switching power supply is also controlled to be valid. At this time, since the switching power supply has already output 12V voltage, there is no need to perform power-on operation on the switch.

Specifically, the above-mentioned second management control unit is also used to monitor the operating characteristic parameters of the line cards and switching power supplies in the switch.

The working characteristic parameters of line cards and switching power supply lights include parameters such as temperature and power consumption, which are parameters that characterize whether the switch is working normally, so monitoring these parameters is helpful for monitoring the performance of the switch.

In the prior art switch shown in Figure 1, the temperature is monitored by the management board, but the management board needs to handle a lot of work at the same time, such as: updating of the routing table, processing of protocol messages, etc., so the management board The probability of problems is also very high. Once the management board fails, for example, when the CPU of the management board falls into an infinite loop, the temperature can no longer be monitored. In order to solve this problem, parameters such as problems can be monitored through the second management control unit on the management board.

EEPROM is mainly used to store relevant information of the board where it is located, such as the power consumption of the board, the type of the line card, and the factory serial number of the line card. A temperature monitoring chip is installed on the board to monitor the temperature of each point on the board. For a more complex system, multiple temperature monitoring chips can be used and placed in different places on the board, such as the air inlet of the air duct , the air outlet, the hottest place on the board, etc. The IIC bus output by the second CPU of the management board passes through the I2C bus switch and expands into multiple IIC buses, and then connects to the EEPROM and temperature monitoring chip of each board to obtain the temperature information of the system.

Since the second management control unit is located on the management board, and there can be two management boards in the switch, there are also two second management control units, and the line card can generally only read the IIC bus signal on the main management board. , so that the management board needs to transmit the master-slave information to the second management control unit, which can be through the Master# signal shown in Figure 2 . When the second CPLD monitors that the state of the Master# signal changes, it may notify the second CPU. Assuming that there are two management boards, management board A and management board B, in the switch, the circuit principle of any line card in the switch is shown in Figure 5, where MasterA and MasterB are from management board A and management board B respectively. The master-slave status indicator signal, the multiplexer is connected to two IIC buses from management board A and management board B, and MasterA and MasterB are used to control the switch of the multiplexer to select two IIC buses from two management boards all the way. For example, when the management board A is the main management board and MasterA is the main signal, then the multiplexer will select the IIC bus from the management board A; when the management board B is the main management board, the multiplexer will select IIC bus from management board B.

The following describes how to obtain working parameters such as temperature and power consumption, which can be obtained remotely through the 100M electrical port of the second management control unit, or through the console of the management board.

When the user sends a request to obtain temperature, power, etc. through the 100M electrical port, the second CPU reads the Master# signal in the second CPLD. If it is on the main management board, it directly obtains the corresponding temperature and power through the IIC bus Consumption and other information, and feedback to the user. If it is located on the slave management board, the request for obtaining temperature, power, etc. is passed to the second CPU on the main management board through the UART channel, and the second CPU on the main management board obtains the temperature, power, etc. through the IIC bus after receiving the request. The information such as power consumption is transmitted to the second CPU on the slave management board through the UART channel, and the second CPU on the slave management board transmits the information to the user through the 100M electrical port.

When the user initiates a request to obtain temperature and power through the console of the management board, the first CPU on the management board will pass the request to the second CPU through the UART channel between the second CPU, and the second CPU can follow the After receiving the request from the 100M electrical port, obtain information such as temperature and power in a similar manner, and transmit it to the first CPU of the management board through the UART channel, and the first CPU of the management board outputs these information to the user through the console.

The second management control unit can monitor the temperature, power consumption and other information of the switch in an interrupt mode, that is, the temperature monitoring chip outputs mid-range signals when the monitored temperature reaches a preset temperature value, as long as these mid-range signals are notified to the second CPLD, the second CPLD can monitor these interrupt signals, and then notify the second CPU, which can be reported through the INT# pin, and of course can also be reported in other ways. The second CPLD can also monitor various states of the switching power supply at the same time, and when there is a change, it can also report to the second CPU through the INT# pin.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (10)

1. A management board provided in a switch, comprising:

the first management control unit is powered by a main voltage in a switching power supply in the switch and is used for monitoring the running state of the switch;

and the second management control unit is supplied with power by the bypass voltage in the switching power supply in the switch and is used for controlling the switching power supply in the switch to use the main voltage to carry out power-on and power-off operation on the switch.

2. The management board according to claim 1, wherein said first management control unit comprises a first central processing unit CPU and a first complex programmable logic device CPLD, and said second management control unit comprises a second CPU and a second CPLD; wherein,

and the second CPU is used for controlling the output state of the main voltage of the switching power supply in the switch through the second CPLD so as to realize the power-on and power-off operation of the switch.

3. The management board according to claim 2, wherein the second CPU is configured to detect whether an opposite management board having a master-slave relationship with the management board in which the second CPU is located exists in the switch; when the detection result is that the main voltage of the switch power supply in the switch is not available, the output state of the main voltage of the switch power supply in the switch is controlled to be an effective state through the second CPLD, and the switch is powered on; and when the detection result is that the current output state of the main voltage of the switch power supply is invalid, judging the reason why the current output state of the main voltage of the switch power supply is invalid, and if the reason is that the switch is started for the first time, controlling the output state of the main voltage of the switch power supply in the switch to be valid through the second CPLD to realize the electrification operation of the switch.

4. The management board according to claim 2, wherein the first CPU is configured to send a heartbeat signal to the second CPLD through the first CPLD in a normal operating state of the switch;

the second CPU is configured to detect whether an opposite management board having a master-slave relationship with a management board where the second CPU is located exists in the switch when a heartbeat signal sent by the first CPU is not obtained through the second CPLD within a set time period, and control an output state of a main voltage of a switching power supply in the switch to be an invalid state and then to be an valid state through the second CPLD if the detection result indicates that the opposite management board does not exist, so that the switch is powered off and then powered on.

5. The management board according to claim 2, wherein the first CPU is configured to send a power-down request to the second CPU through the first CPLD and the second CPLD in a normal operating state of the switch;

the second CPU is used for detecting whether an opposite end management board having a master-slave relation with a management board where the second CPU is located exists in the switch or not according to a power-off request sent by the first CPU and received through the second CPLD, and when the detection result shows that the opposite end management board does not exist, the second CPLD is used for controlling the output state of the main voltage of the switching power supply in the switch to be an invalid state so as to realize the power-off operation of the switch; and when the detection result is that the power-off request exists, the received power-off request is forwarded to an opposite terminal management board, the output state of the main voltage of the switching power supply in the switch is controlled to be an invalid state through the second CPLD, and the power-off operation of the switch is realized.

6. The management board according to any of claims 3-5, wherein a detection contact for detecting whether the opposite management board exists in the switch is connected to the second CPLD;

the second CPU is configured to confirm that the opposite management board exists in the switch when the detection contact is detected to be at a low level by the second CPLD, and confirm that the opposite management board does not exist in the switch when the detection contact is detected to be at a high level.

7. The management board according to claim 2, wherein the second CPU is provided with a network communication interface;

and the second CPU is used for controlling the output state of a switching power supply in the switch through the second CPLD after receiving a power-on and power-off request of a user through the network communication interface, so as to realize the power-on and power-off operation of the switch.

8. The management board according to claim 3, wherein the second CPU is configured to detect a cause flag bit that identifies a cause that the current output state of the switching power supply is invalid, and determine that the cause is the first startup of the switch when the cause flag bit is detected to be 0.

9. The management board of claim 1, wherein the second management control unit is further configured to monitor operating characteristic parameters of line cards and switching power supplies in the switch.

10. A switch, characterized in that it comprises a management board according to any one of claims 1-9.

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