CN115766510A - Testing method and readable medium for loop detection stability of switch - Google Patents

Abstract

The invention discloses a testing method and a readable medium for the loop detection stability of a switch, wherein the testing method for the loop detection stability of the switch comprises the steps of constructing a cable misconnection testing topology, respectively connecting a first port and a second port of a tested switch with a first network card and a second network card of a PC (personal computer), and selecting the cable misconnection condition to be tested; issuing configuration to a tested switch, forbidding a loop detection function of a second port of the tested switch, and enabling the loop detection function of a first port of the tested switch; and sequentially judging whether all the cable misconnection conditions are selected, and carrying out loop detection stability test on the selected cable misconnection conditions. The invention uses the PC to simulate the auxiliary switch, the construction and the sending of the message can be finished by the automatic system controlling the PC, the test can be finished only by one switch and one PC, other switches can not be occupied, and the equipment resource cost is saved.

Description

Test method and readable medium for loop detection stability of switch

technical field

The invention relates to the technical field of loop detection, in particular to a testing method and a readable medium for loop detection stability of an exchange.

Background technique

The loop detection function is an important function of the switch, and its main function is to automatically close the problematic port to eliminate the loop when there is a loop in the network.

Network connection or configuration errors can easily lead to forwarding loops in the Layer 2 network, causing the device to repeatedly send broadcast, multicast, and unknown unicast messages, resulting in waste of network resources or even network paralysis. Loop detection is designed to effectively Prevent loops to ensure the stability and security of the network. Therefore, the stability test of the loop detection function is particularly important.

In addition, the loop detection function has an automatic recovery time. When the automatic recovery time expires, the blocked port will change to the forwarding state. During this period, the network will be in the loop state again. If the port is in the forwarding state for too long It will have a great negative impact on the network. Therefore, after the loop detection automatic recovery time expires, it is especially important to test the duration after the blocked port changes to the forwarding state.

At present, there are mainly two ways to test the stability of the existing loop detection function: 1. Purchase a network tester and simulate a switch to conduct a network test; 2. Use multiple switches to conduct a network test together. However, if you buy a network tester and simulate a switch for networking testing, one tester port can only simulate one switch, but the price of the network tester is relatively expensive, which greatly increases the test cost; and using multiple switches together for network testing, Because the stability test takes a long time, it will occupy the equipment resources of the laboratory for a long time, and it will also affect the test progress of other projects. At the same time, both of the above two test methods require testers to keep watching, which consumes a lot of manpower, and there are also cases where human factors lead to incomplete or missed tests.

Therefore, it is necessary to develop a fully automated test method for loop detection stability of switches to solve the above problems.

Contents of the invention

In order to overcome the problems that the existing loop detection function stability test method is relatively expensive, occupies other switches, and requires testers to keep staring, the present invention provides a test method and readable test method for loop detection stability of switches. medium.

Technical solution of the present invention is as follows:

In a first aspect, the present invention provides a test method for loop detection stability of a switch, comprising the following steps:

Step S1, build a cable misconnection test topology, connect the first port and the second port of the switch under test to the first network card and the second network card of the PC respectively, and check the cable misconnection situation to be tested;

Step S2, sending the configuration to the switch under test, disabling the loop detection function of the second port of the switch under test, and enabling the loop detection function of the first port of the switch under test;

Step S3, sequentially determine whether all the cable misconnection situations are checked, and perform a loop detection stability test on the checked cable misconnection situations;

Step S4, when performing a loop detection stability test on the checked cable misconnection situation, the loop detection state of the first port of the switch under test is set to a blocking state, and then the second network card of the PC sends Its first network card sends the two-layer data message, and through the sending and receiving time of the two-layer data message, calculates the duration of the first port of the tested switch to maintain the forwarding state after the automatic recovery time of the loop detection is overtime.

According to the method for testing the stability of the switch loop detection in the above solution, in step S1, after the cable misconnection conditions to be tested are checked, the test time for each cable misconnection condition is set.

According to the testing method for the loop detection stability of the switch in the above scheme, in step S1, the cable misconnection situation includes the first cable misconnection situation that causes the self-loop of the switch, and the second situation that causes the self-loop of the downlink equipment of the switch. The first case of cable misconnection and the third case of cable misconnection causing a loop between switches.

Further, in step S4, the specific sub-steps of performing a loop detection stability test on the first cable misconnection situation include:

Step A1, the loop detection function of the first port of the switch under test is in an enabled state, and sends a first loop detection message, and after the first network card of the PC receives the first loop detection message , sending the first loop detection message directly from the second network card of the PC to the second port of the switch under test, after the switch under test receives the first loop detection message, The loop detection state of its first port is set to blocking state;

Step A2, constructing a first layer-2 data message, and sending the first layer-2 data message from the second network card of the PC to the first network card of the PC;

Step A3, real-time monitoring of the first network card of the PC receiving the first layer-2 data message, and through the sending and receiving time of the first layer-2 data message, calculate the loop detection automatic recovery time after the overtime. The first port of the test switch maintains the duration of the forwarding state.

Further, in step A3, when the automatic recovery time of the loop detection times out, the first port of the switch under test changes from the blocking state to the forwarding state, and the first network card of the PC receives the first port of the PC. The first layer-2 data packet sent by the second network card.

Further, in step A3, after the first port of the switch under test enters the forwarding state, record the time and message when the first network card of the PC receives the first layer-2 data message every time Quantity, and calculate the time that the forwarding state maintains when the first port of described switch under test changes from blocking state to forwarding state each time;

Further, in step A3, after the calculation is completed, the records are saved in an excel file.

Further, in step S4, the specific sub-steps of performing a loop detection stability test on the second cable misconnection situation include:

Step B1, the loop detection function of the first port of the tested switch is in an enabling state, and a second loop detection message is sent, and after the first network card of the PC receives the second loop detection message , modifying the last hop field in the second loop detection message to the MAC address of the PC, and then sending the modified second loop detection message from the first network card of the PC to The first port of the switch under test, after receiving the modified second loop detection message, the switch under test sets the loop detection state of its first port to a blocking state;

Step B2, constructing a second layer-2 data message, and sending the second layer-2 data message from the second network card of the PC to the first network card of the PC;

Step B3, real-time monitoring of the first network card of the PC receiving the second layer 2 data message, and through the sending and receiving time of the second layer 2 data message, calculate the loop detection automatic recovery time overtime The duration for which the first port of the switch under test maintains the forwarding state.

Further, in step B3, when the automatic recovery time of the loop detection times out, the first port of the switch under test changes from the blocking state to the forwarding state, and the first network card of the PC receives the first port of the PC. The second layer-2 data packet sent by the second network card.

Further, in step B3, when the first port of the switch under test enters the forwarding state, record the time and message when the first network card of the PC receives the second layer-2 data message each time number, and calculate the time for the forwarding state to be maintained each time the first port of the switch under test changes from the blocking state to the forwarding state.

Further, in step B3, after the calculation is completed, the records are saved into an excel file.

Further, in step S4, the specific sub-steps of performing a loop detection stability test on the third cable misconnection situation include:

Step C1, the first port of the switch under test sends a third loop detection message, and after receiving the third loop detection message, the first network card of the PC sends the third loop detection message In the text, the last hop field is modified to the MAC address of the PC, and then the modified third loop detection message is sent from the second network card of the PC to the second port of the switch under test, so After the switch under test receives the modified third loop detection message, the loop detection state of its first port is set to blocking state;

Step C2, constructing a third layer-2 data message, and sending the third layer-2 data message from the second network card of the PC to the first network card of the PC;

Step C3, real-time monitoring of the situation of the first network card of the PC receiving the third and second layer data messages, and through the sending and receiving time of the third and second layer data messages, calculate the loop detection automatic recovery time after the overtime The duration for which the first port of the switch under test maintains the forwarding state.

Further, in step C3, when the automatic recovery time of the loop detection times out, the first port of the switch under test changes from the blocking state to the forwarding state, and the first network card of the PC receives the first port of the PC. The third layer-2 data packet sent by the second network card.

Further, in step C3, after the first port of the switch under test enters the forwarding state, record the time and message when the first network card of the PC receives the third layer two data message every time number, and calculate the time for the forwarding state to be maintained each time the first port of the switch under test changes from the blocking state to the forwarding state.

Further, in step C3, after the calculation is completed, the records are saved into an excel file.

Further, the first loop detection message, the second loop detection message and the third loop detection message all include the destination MAC address, the source MAC address, the protocol type of the message, and the The MAC address of the switch of the message, the port number of the switch sending the message, and the last hop field.

In a second aspect, the present invention provides a computer-readable medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the above-mentioned method for testing the stability of a switch loop detection.

According to the present invention of above-mentioned scheme, its beneficial effect is:

1. The present invention uses a PC to simulate an auxiliary switch. The construction and sending of messages can be completed by the automation system controlling the PC. There is no need to purchase any testing instruments, and only one switch and one PC are needed to complete the test without occupying other switches. , to save equipment resource costs, and at the same time, testing can be carried out at any time, such as night or weekend, which does not occupy equipment and time during normal working hours, saving time and cost;

2. The Layer 2 data message constructed by the present invention is sent from the PC network card, and the loop detection automatic recovery time is calculated through the sending and receiving of the message. After the automatic recovery time of the loop detection is overtime, the duration of the switch port under test maintaining the forwarding state can be tested, and the millisecond unit can be tested. Time, high test accuracy;

3. During the testing process of the present invention, the operating status of the switch loop detection can be monitored in real time for a long time. When the loop detection function of the switch fails, the system can monitor and record it in real time, and can test the switch loop better and more comprehensively. The stability of the detection function and less operation steps can greatly reduce human misoperation.

Description of drawings

Fig. 1 is the schematic flow sheet of the test method of switch loop detection stability among the present invention;

Fig. 2 is an enlarged view of part A in Fig. 1;

Fig. 3 is an enlarged view of part B in Fig. 1;

FIG. 4 is a schematic diagram of the first type of typical cable misconnection causing a loop;

FIG. 5 is a schematic diagram of the second typical cable misconnection causing a loop;

FIG. 6 is a schematic diagram of a third typical cable misconnection that causes a loop;

FIG. 7 is a schematic diagram of a cable misconnection test topology constructed in the present invention.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

It should be noted that the terms "comprising" and "having" and any variations thereof in the description and claims of the present invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

Please refer to FIG. 1 to FIG. 3, an embodiment of the present invention provides a test method for loop detection stability of a switch, including the following steps:

Step S1, build a cable misconnection test topology, check the cable misconnection situation to be tested, and set the test time for each cable misconnection situation.

Specifically, there are three typical cases of misconnection of cables that cause loops. The first is that field wiring personnel mistakenly connect two ports of the same switch with a single cable, causing the self-loop of the switch to be misconnected. The connection situation, as shown in Figure 4; the second is that the field wiring personnel mistakenly connect the two ports of the downlink device of the switch with a cable, resulting in the wrong connection of the self-loop cable of the downlink device of the switch, as shown in Figure 5 The third is that the on-site wiring personnel mistakenly connect the first port and the second port of the switch under test to the first port and the second port of the auxiliary switch, resulting in the wrong connection of the cables forming a loop between the switches. As shown in Figure 6.

The present invention builds the cable misconnection test topology according to the above three typical cable misconnection situations that cause loops, as shown in Figure 7, the first port and the second port of the switch to be tested are respectively connected to the first network card of the PC 1. The second network card can complete the three typical cable misconnection situations that cause loops shown in FIGS. 1 to 3 . In the present invention, when testing, only one switch to be tested and one PC are needed, and the PC is used to simulate the auxiliary switch to send the loop detection message of the system structure, without purchasing test instruments, and other switches will not be occupied. Save equipment resource cost.

Step S2, calling the CRT to deliver the configuration to the switch under test, disabling the loop detection function of the second port of the switch under test, and enabling the loop detection function of the first port of the switch under test.

Among them, CRT is a serial port debugging tool, which can be used to issue configuration commands to the switch under test through the serial port. In addition, the reason why only the first port of the switch under test is enabled is to eliminate loops and achieve test results.

Step S3 , judging whether the first type of cable misconnection is checked, if not checked, it means that the test is not performed, and step S7 is performed, and if checked, then step S4 is performed.

Step S4, the first port of the tested switch sends out the first loop detection message, and after the first network card of the PC receives the first loop detection message, the first loop detection message is directly transmitted from the second network card of the PC Send to the second port of the switch under test, after the switch under test receives the first loop detection message, it will think that there is a loop in the network, and the loop detection state of its first port will be set to blocking state.

Specifically, the content of the first loop detection message includes the destination MAC address, the source MAC address, the protocol type of the message, the MAC address of the switch that sends the message, the port number that the switch sends the message, and the last hop field . Wherein, the destination MAC address is set as a broadcast address, so that when the message passes through other switches, it can be broadcast and forwarded as a broadcast message. Both the source MAC address and the MAC address of the switch that sent the message are used to record which switch sent the loop detection message; the port on which the switch sent the message is used to determine which port is blocked after the loop is formed. In this way, the function of loop elimination is achieved; the last hop field is used to record the MAC address of the last switch that the message passes through.

Step S5, constructing a first layer-2 data packet, and sending the first layer-2 data packet from the second network card of the PC to the first network card of the PC.

Wherein, the sending rate of the first and second layer data packets is 1000 packets/second, and the continuous sending time is T1, and the time in millisecond unit can be tested by using the above settings.

Step S6, real-time monitoring of the situation of the first network card of the PC receiving the first and second layer data messages, and through the sending and receiving time of the first and second layer data messages, calculate the first port of the switch under test after the automatic recovery time of the loop detection is overtime The duration to maintain the forwarding state.

Specifically, when the first port of the switch under test is blocked, the first network card of the PC cannot receive the first layer-2 data packet sent by the second network card; when the automatic recovery time of the loop detection (such as an interval of 30 seconds) After the timeout, the first port of the switch under test will change from the blocking state to the forwarding state. At this time, the first network card of the PC can receive the first and second layer data packets sent by the second network card, and wait for the detection time of the switch under test ( If the interval is 5 seconds) after timeout, the first port of the tested switch will send the first loop detection message again, and then enter the blocking state; when the first port of the tested switch enters the forwarding state, record the first network card of the PC The time and number of packets each time the first and second layers of data packets are received, and the duration of maintaining the forwarding state when the first port of the switch under test is changed from the blocking state to the forwarding state is calculated. The calculation method is: The number of packets/1000 (packets/second); after the calculation is completed, save the records to an excel file for easy viewing by testers.

Step S7, judging whether the second type of cable misconnection is checked, if not checked, it means that the test is not performed, and step S10 is performed, and if checked, then step S8 is performed.

Step S8, the first port of the switch under test sends a second loop detection message, after the first network card of the PC receives the second loop detection message, the last hop field in the second loop detection message is modified is the MAC address of the PC, and then the modified second loop detection message is sent from the first network card of the PC to the first port of the switch under test, and after the switch under test receives the modified second loop detection message , it will consider that there is a loop in the network, and set the loop detection status of the first port to blocked.

Among them, since the second cable misconnection is the self-loop of the downlink equipment of the switch, after passing through the auxiliary switch, the PC is used to simulate the auxiliary switch in the present invention, so the previous hop field in the second loop detection message needs to be modified is the MAC address of the PC to simulate the second cable misconnection situation. The first case of cable misconnection is the self-loop of the switch, so the previous hop is still itself, and the content of the first loop detection message does not need to be changed. At the same time, the content of the second loop detection message is the same as that of the first loop detection message, and also includes the destination MAC address, source MAC address, protocol type of the message, the MAC address of the switch that sends the message, and the switch that sends the message. The port number and last hop field of the packet.

Step S9, constructing a second layer-2 data packet, and sending the second layer-2 data packet from the second network card of the PC to the first network card of the PC.

Wherein, the sending rate of the second and second layer data packets is 1000 packets/second, and the continuous sending time is T2, and the time in millisecond unit can be tested by using the above settings.

Step S10, real-time monitoring of the situation of the first network card of the PC receiving the second layer 2 data message, and through the sending and receiving time of the second layer 2 data message, calculate the first port of the switch under test after the automatic recovery time of the loop detection is overtime The duration to maintain the forwarding state.

Specifically, when the first port of the switch under test is in a blocking state, the first network card of the PC cannot receive the second layer-2 data packet sent by the second network card; when the automatic recovery time of the loop detection (such as an interval of 30 seconds) After the timeout, the first port of the switch under test will change from the blocking state to the forwarding state. At this time, the first network card of the PC can receive the second layer-2 data message sent by the second network card, and wait for the detection time of the switch under test ( After the timeout, the first port of the tested switch will send the second loop detection message again, and then enter the blocking state; when the first port of the tested switch enters the forwarding state, record the first network card of the PC The time and number of packets each time the second layer 2 data packet is received, and the time for the forwarding state to be maintained when the first port of the switch under test is changed from the blocking state to the forwarding state is calculated. The calculation method is: report The number of files/1000 (packages/second); after the calculation is completed, save the records to an excel file for easy viewing by testers.

Step S11 , judging whether the third type of cable misconnection is checked, if not checked, it means that the test will not be performed, and the test will be ended directly, if checked, then step S12 will be executed.

Step S12, the first port of the switch under test sends a third loop detection message, and after the first network card of the PC receives the third loop detection message, the last hop field in the third loop detection message is changed to MAC address of the PC, and then the modified third loop detection message is sent from the second network card of the PC to the second port of the switch under test. After the switch under test receives the modified third loop detection message, It will consider that there is a loop in the network, and set the loop detection status of the first port to blocked.

Wherein, since the third cable misconnection situation is that a loop is formed between the switches, after passing through the auxiliary switch, the PC is used to simulate the auxiliary switch in the present invention, so the last hop field in the third loop detection message needs to be modified is the MAC address of the PC to simulate the third cable misconnection situation. At the same time, the content of the third loop detection message is the same as that of the first loop detection message, and also includes the destination MAC address, source MAC address, protocol type of the message, the MAC address of the switch that sends the message, and the switch that sends the message. The port number and last hop field of the packet.

Step S13 , constructing a third layer-2 data packet, and sending the third layer-2 data packet from the second network card of the PC to the first network card of the PC.

Wherein, the sending rate of the third and second layer data packets is 1000 packets/second, and the continuous sending time is T3, and the time in millisecond unit can be tested by using the above settings.

Step S14, real-time monitoring of the situation that the first network card of the PC receives the third and second layer data messages, and through the sending and receiving time of the third and second layer data messages, calculate the first port of the tested switch after the automatic recovery time of the loop detection is overtime The duration to maintain the forwarding state.

Specifically, when the first port of the switch under test is in a blocking state, the first network card of the PC cannot receive the third and second layer data packets sent by the second network card; Afterwards, the first port of the switch under test will change from the blocking state to the forwarding state, and at this moment, the first network card of the PC can receive the third and second layer data packets sent by the second network card, and wait for the detection time of the switch under test (such as interval 5 seconds) after the timeout, the first port of the tested switch will send a loop detection message again, and then enter the blocking state; when the first port of the tested switch enters the forwarding state, record every time the first network card of the PC receives The time and number of packets when reaching the third and second layers of data packets, and calculate the time for the forwarding state to be maintained when the first port of the switch under test changes from the blocking state to the forwarding state each time, the calculation method is: number of packets/ 1000 (packages/second); after the calculation is completed, save the record to an excel file, which is convenient for testers to view.

The test method for the stability of the switch loop detection provided in this embodiment uses a PC to simulate an auxiliary switch, and the construction and sending of the message can be completed by the automation system controlling the PC without purchasing any test instruments, only one switch and one The PC can complete the test without occupying other switches, saving equipment resource costs; since the present invention can automatically complete the test, it can be tested at any time, such as night or weekend, without occupying the equipment and time of normal working hours, saving time Cost: The constructed Layer 2 data message is sent from the PC network card, and the loop detection automatic recovery time is calculated by sending and receiving the message. After the automatic recovery time of the loop detection expires, the duration of the switch port under test maintaining the forwarding state can be tested for the time in milliseconds. High precision; during the test process, the running status of the switch loop detection can be monitored in real time for a long time. When the loop detection function of the switch fails, the system can monitor and record it in real time, which can better and more comprehensively test the switch loop detection The stability of the function and less operation steps can greatly reduce human misoperation.

Those skilled in the art can understand that various aspects of the present invention can be implemented as systems, methods or program products. Therefore, various aspects of the present invention can be embodied in the following forms, that is: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, which can be collectively referred to herein as "circuit", "module" or "system".

According to this embodiment, any multiple of modules, sub-modules, units, and sub-units, or at least part of the functions of any multiple of them can be implemented in one module. Any one or more of the modules, submodules, units, and subunits according to this embodiment can be implemented by being divided into multiple modules. Any one or more of modules, submodules, units, and subunits according to this embodiment may be at least partially implemented as a hardware circuit, such as a field programmable gate array (FPGA), a programmable logic array (PLA), an on-chip system, system-on-substrate, system-on-package, application-specific integrated circuit (ASIC), or hardware or firmware that may be implemented in any other reasonable manner by integrating or packaging circuits, or in software, hardware, and firmware Any one of the implementations or an appropriate combination of any of them. Alternatively, one or more of the modules, submodules, units, and subunits according to this embodiment may be at least partially implemented as a computer program module, and when the computer program module is executed, corresponding functions may be performed.

In one embodiment, the present invention provides a test device for loop detection stability of a switch, which may include at least one processing unit and at least one storage unit. Wherein, the storage unit stores program codes, and when the program codes are executed by the processing unit, the processing unit executes the steps in the test of the loop detection stability of the switch according to various exemplary embodiments of the present invention described above in this specification. For example, the processing unit may execute the flow of the method for testing the stability of the switch loop detection as shown in FIG. 1 .

In one embodiment, the present invention provides a computer-readable medium, which stores computer-executable instructions, and the computer-executable instructions are used to perform the switch loop detection described above in this specification according to various exemplary embodiments of the present invention Steps in the Stability Test Method.

The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. A readable signal medium may include a data signal carrying readable program code in baseband or as part of a carrier wave. A readable signal medium may also be any readable medium other than a readable storage medium that can transmit, propagate, or transport a program for use by or in conjunction with an instruction execution system, apparatus, or device. Program code embodied on a readable medium may be transmitted using any appropriate medium, including - but not limited to - wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

In addition, while operations of the methods of the present invention are depicted in the figures in a particular order, there is no requirement or implication that these operations must be performed in that particular order, or that all illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step for execution, and/or one step may be decomposed into multiple steps for execution.

It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should belong to the protection scope of the appended claims of the present invention.

The patent of the present invention has been exemplarily described above in conjunction with the accompanying drawings. Obviously, the implementation of the patent of the present invention is not limited by the above-mentioned method, as long as the method concept and technical solutions of the patent of the present invention are adopted. Various improvements are made, or there is no improvement Directly applying the concepts and technical solutions of the patent of the present invention to other occasions is within the protection scope of the present invention.

Claims (10)

1. A method for testing the loop detection stability of a switch is characterized by comprising the following steps:

s1, building a cable misconnection test topology, connecting a first port and a second port of a tested switch with a first network card and a second network card of a PC (personal computer) respectively, and selecting the misconnection condition of the cable to be tested;

s2, issuing configuration to a tested switch, forbidding a loop detection function of a second port of the tested switch, and enabling the loop detection function of a first port of the tested switch;

s3, sequentially judging whether all the cable misconnection conditions are subjected to hook selection, and carrying out loop detection stability test on the hooked cable misconnection conditions;

and S4, when the hooked cable misconnection condition is subjected to a loop detection stability test, setting the loop detection state of the first port of the tested switch to be a blocking state, then sending a two-layer data message to the first network card by the second network card of the PC, and calculating the duration time of the first port of the tested switch maintaining the forwarding state after the loop detection automatic recovery time is overtime through the transceiving time of the two-layer data message.

2. The method for testing the loop detection stability of the switch according to claim 1, wherein in step S1, after the cable misconnection condition to be tested is selected, a test time for each cable misconnection condition is set.

3. The method for testing the loop detection stability of the switch according to claim 1, wherein in step S1, the cable misconnection conditions include a first cable misconnection condition causing a self-loop of the switch, a second cable misconnection condition causing a self-loop of a device connected under the switch, and a third cable misconnection condition causing a loop between the switches.

4. The method for testing the loop detection stability of the switch according to claim 3, wherein in step S4, the specific sub-step of performing the loop detection stability test on the first cable miswire condition includes:

step A1, a loop detection function of a first port of a tested switch is in an enabling state, a first loop detection message is sent out, after a first network card of the PC receives the first loop detection message, the first loop detection message is directly sent to a second port of the tested switch from a second network card of the PC, and after the tested switch receives the first loop detection message, the loop detection state of the first port of the tested switch is set to be in a blocking state;

a2, constructing a first two-layer data message, and sending the first two-layer data message to a first network card of the PC from a second network card of the PC;

and A3, monitoring the condition that the first network card of the PC receives the first two-layer data message in real time, and calculating the duration time of the first port of the tested switch maintaining the forwarding state after the loop detection automatic recovery time is overtime according to the receiving and sending time of the first two-layer data message.

5. The method for testing the loop detection stability of the switch according to claim 4, wherein the first loop detection message includes a destination MAC address, a source MAC address, a protocol type of the message, an MAC address of a switch sending the message, a port number of the switch sending the message, and a previous hop field.

6. The method according to claim 4, wherein in step A3, when the automatic recovery time of the loop detection is over, the first port of the switch under test is changed from a blocking state to a forwarding state, and the first network card of the PC receives the first layer data packet sent by the second network card of the PC.

7. The method according to claim 4, wherein in step A3, after the first port of the switch under test enters the forwarding state, the time and the number of packets of the first layer data packet received by the first network card of the PC each time are recorded, and the time for maintaining the forwarding state when the first port of the switch under test changes from the blocking state to the forwarding state each time is calculated.

8. The method for testing the loop detection stability of the switch according to claim 3, wherein in step S4, the specific sub-step of performing the loop detection stability test on the second cable miswire condition includes:

step B1, the loop detection function of the first port of the detected switch is in an enabling state, a second loop detection message is sent out, after the first network card of the PC receives the second loop detection message, the last hop field in the second loop detection message is modified into the MAC address of the PC, the modified second loop detection message is sent to the first port of the detected switch from the first network card of the PC, and after the detected switch receives the modified second loop detection message, the loop detection state of the first port of the detected switch is set to be in a blocking state;

b2, constructing a second layer data message, and sending the second layer data message to the first network card of the PC from the second network card of the PC;

and step B3, monitoring the condition that the first network card of the PC receives the second layer data message in real time, and calculating the duration time of the first port of the tested switch maintaining the forwarding state after the loop detection automatic recovery time is overtime according to the receiving and sending time of the second layer data message.

9. The method for testing the loop detection stability of the switch according to claim 3, wherein in step S4, the specific sub-step of performing the loop detection stability test on the third cable misconnection condition includes:

step C1, a first port of the tested switch sends a third loop detection message, a first network card of the PC receives the third loop detection message, a first hop field in the third loop detection message is modified into an MAC address of the PC, the modified third loop detection message is sent to a second port of the tested switch from a second network card of the PC, and the loop detection state of the first port of the tested switch is set to be a blocking state after the modified third loop detection message is received by the tested switch;

c2, constructing a third two-layer data message, and sending the third two-layer data message to the first network card of the PC from the second network card of the PC;

and step C3, monitoring the condition that the first network card of the PC receives the third two-layer data message in real time, and calculating the duration time of the first port of the tested switch maintaining the forwarding state after the loop detection automatic recovery time is overtime according to the receiving and sending time of the third two-layer data message.

10. A computer-readable medium storing computer-executable instructions for performing the method for testing the stability of loop detection of a switch according to any one of claims 1 to 9.

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