TWI501593B - Switch test apparatus and test apparatus thereof - Google Patents

Description

Switch test device and test method

The invention relates to a test device for a switch and a test method thereof, in particular to a test device built in a switch and a test method thereof.

With the advancement of the times, people's demand for information is also increasing. In this era of information explosion, the Internet, which provides instant and rich information, has become an indispensable tool in people's daily lives. In the modern Internet technology, switches are used to replace the hubs used in the past. This network technology using switches successfully achieves the hardware implementation of the network bridging function and effectively improves The effectiveness of the Internet.

For the mass production test of the switch, please refer to the schematic diagram of the conventional switch test apparatus 100 shown in FIG. Each of the conventional switches 110, P1 to P6, is connected to the switch test device 120. When the test is in progress, the switch test device 120 sends a packet to the switch 110 and receives the packet replied by the switch 110. If the number of packets replied by the switch 110 is not equal to the number of packets sent by the switch test device 120, it indicates that the switch 110 will drop the packet. Although the test method of the conventional switch test device 100 is simple, when used in a production line for mass production testing, a large number of switch test devices 120 are a huge overhead, especially in the case of testing high-port switches. .

In response to the above problems, a switch 200 having a test circuit built therein as shown in FIG. 2 is proposed. However, in order for the switch 200 to be able to recognize that the current mode is the test mode or the normal mode, a control signal CTRL must be added to control the built-in test circuit 210. The control signal CTRL must be transmitted by installing a button on the outer casing of the switch 200, which not only increases the cost of production, but also the external button may be used under normal use because of a user's accidental touch.

In summary, the present invention provides a test method for a switch, which detects a special port connection sequence, and uses an error data packet to acknowledge the port connection mode, and detects the presence of an abnormal packet to confirm the non-authentication. Normal mode to automatically start the test mode. In addition to the need to switch the switch to test mode switching, it can effectively prevent the switch from entering the test mode, which affects the normal mode of the switch.

The present invention provides another test method for a switch. After automatically detecting and entering the test mode, the correct data packet is used to test the majority of the switch's transmission actions.

The invention provides a test device for a switch, which is used to detect a special port connection sequence, and the transmission of an error data packet, and the presence of a non-detection normal packet, to start the test mode, and use the correct data packet to Test the majority of the switch's transmission actions.

The invention provides a test method for a switch, wherein the switch has N transmission port groups, each of which has a plurality of ports, and N is a positive integer. The testing method of the switch includes determining, in the first preset connection time, the connection status of all the ports of one of the transmission port groups, and thereby setting the standby flag of the port group. At this time, only all ports of one port group are connected, and all ports of other port groups are in a non-connected state. Then, the error data packet is sent to one of the connected ports according to the standby flag. Then, it is determined whether one of the ports other than the error data packet sent by the port group receives the error data packet. Finally, it is determined whether the unconnected each port group is changed one by one after the previous port group completes the connection, whether the connection state is changed within the second preset connection time, and all the ports of the same port group are connected by only a single port. The state transitions to all the time that the connection state is less than the first preset connection time, and all the port groups have not received any normal packets in the above process, and thereby initiate the test mode.

In an embodiment of the present invention, the determining, by the first preset connection time, the connection status of all the ports of the one of the transmission port groups, and the step of setting the port group standby flag comprises: when determining the i One of the ports of the transmission port group is connected, and the counting time count value is started, where i is a positive integer less than or equal to N. When the time count value is equal to the first preset connection time, it is determined that all the ports of the i-th transmission port group are connected, and the standby flag is set.

In an embodiment of the present invention, the step of determining that the unconnected each port group changes one by one, and the step of starting the test mode further comprises: when the previous port group of the jth port group is connected And determining, in the second preset connection time, whether one of the 埠 of the j-th transmission port group is connected. If so, return to zero and restart the count time count value, where j is a positive integer less than or equal to N, and j is not equal to i. When the time count value is equal to the first preset connection time, it is determined whether all of the 埠 of the jth transmission port group are connected. Finally, when it is judged that all the ports of the transmission port group are connected, and all the port groups have not received any normal packets in the above process, the test mode is started.

In an embodiment of the invention, the above test method of the switch, wherein any two of the ports in each of the transmission port groups are connected in pairs.

In an embodiment of the present invention, the testing method of the foregoing switch further includes: when the test mode is started, setting a configuration of the switch, so that the switches in the switch are connected in series.

In an embodiment of the present invention, the testing method of the foregoing switch further includes: transmitting, by the first one of the tandem ports, M correct data packets, where M is a positive integer. Next, after the third predetermined test time, the number of correct data packets received in the last one of the series is counted. Finally, the number of correct data packets sent and received is compared to determine the test results of the switch.

The invention further provides a test method for a switch, wherein the switch has N transmission port groups, each of the transmission port groups has a plurality of ports, and any two ports of each port group are connected in pairs, wherein N As a positive integer, the steps include: Configuring the switch so that the ports in the switch are connected in series. Next, M correct data packets are sent by the first one of the series 埠, where M is a positive integer. Then, after the third predetermined test time, the number of correct data packets received in the last one of the series is counted. Finally, the number of correct data packets sent and received is compared to determine the test results of the switch.

The invention also provides a test device for a switch, which is built in a switch, wherein the switch has N transmission port groups, each of the transmission port groups has a plurality of ports, and N is a positive integer. The test device of the switch includes a control circuit, a packet generator, a virtual area network setting circuit, a normal packet detector, and a packet counter. The control circuit connects the ports of the collection port groups to packetize the data packets. The packet generator is coupled to the control circuit and the ports, and the packet generator is controlled by the control circuit to generate a data packet for transmission to one of the ports. The virtual area network setting circuit is coupled to the control circuit for setting the configuration of the switch. The normal packet detector is used to detect whether any of the switches have received any normal packets. The packet counter is coupled to the control circuit and used to count the number of data packets received by the control circuit.

In an embodiment of the invention, the packet counter includes: a correct data packet counter and an error data packet counter. The correct data packet counter is coupled to the control circuit for counting the number of correct data packets received by the last serial port. The error data packet counter is coupled to the control circuit for counting the number of error data packets.

The present invention adopts planning for all the ports of the switch as a plurality of transmission port groups, and determines the connection time of each of the transmission port groups. Then cooperate with the error data packet to confirm that the switch wiring mode meets the test mode requirements, and the method of detecting the test mode does not receive the normal packet at all, so as to confirm that it is not in the normal working mode, and then start the test mode. As a result, the switch can automatically enter the test mode. In the normal operation of the switch, it is not easy to enter the test mode.

The above described features and advantages of the present invention will be more apparent from the following description.

In the following, a plurality of embodiments will be described with reference to the switch test apparatus and its test method of the present invention, and are illustrated by the following, in order to be understood by those skilled in the art and implemented.

Referring first to FIG. 3, FIG. 3 illustrates an embodiment of a switch test apparatus 300 of the present invention. The switch testing device 300 in this embodiment is built in a switch (not shown). The switch test apparatus 300 includes a control circuit 310, a packet generator 320, a virtual area network setting circuit 330, a packet counter 340, and a normal packet detector 350. The control circuit 310 is connected to the 埠P1~PN of the switch, and the 埠P1~PN are divided into a plurality of different transmission port groups for transmitting data packets by the 埠P1~PN. For the grouping method of the switch 埠P1~PN of the switch, please refer to FIG. 4 for a schematic diagram of the switch 400 according to an embodiment of the present invention. The ports P1 to P24 of the switch 400 are divided into three transmission port groups 411 to 413 by using each of the eight ports as a transmission port group. The transmission port group 411 includes 埠P1~P8, the transmission port group 412 includes 埠P9~P16, and the transmission port group 413 includes 埠P17~P24.

Please refer back to Figure 3. The packet generator 320 is coupled to the control circuit 310 and the 埠P1 PN. Packet generator 320 is controlled by control circuitry 310 to generate a data packet. In the illustration of FIG. 3, the packet generator 320 transmits a data packet to the port P1. Please note that the data packet generated by the packet generator 320 is not limited to be transmitted to the 埠P1, but may also be transmitted to one of the 埠P1~PN, as long as the transmitted 埠 is the first one of the series 埠.

In addition, the virtual area network setting circuit 330 is coupled to the control circuit 310 for setting the configuration of the switch so that the ports in the switch are connected in series. The packet counter 340 is also coupled to the control circuit 310 for counting the number of data packets received by the control circuit 310. Here, the packet counter 340 includes a correct data packet counter 341 and an error data packet counter 342 coupled to the control circuit 310. The correct data packet counter 341 is used to count the number of correct data packets received by the last serial port, and the error data packet counter 342 is used to count the number of error data packets received by the first connected port group. . The normal packet detector 350 is used to record whether any switch receives any normal packet during the test mode detection process.

The so-called correct data packet and error data packet are based on a so-called Cycle Redundancy Check (CRC) technique to check whether the data packet is correct or not. The techniques for verifying the correctness of data packets using the above-described cyclic redundancy check are well known to those of ordinary skill in the art and will not be described here.

In terms of the overall operation of the switch test apparatus of the present embodiment, first, the ports belonging to the same transmission port group are all connected. Please refer to FIG. 4 at the same time. In the illustration of FIG. 4, when the switch 400 is to initiate a test action, the ports P1 to P8 of the port group 411 are to be connected in a first preset connection time from a single connection state to a P1 to P8 connection. State, in order to achieve the above requirements, the method of connecting 埠P1~P8 of the port group 411 can be completed by the external connector 421. After the external connector 421 is connected to the corresponding 埠P1~P8, any two 埠P1~P8 can form a paired connection within a very short preset time, and meet the above requirements in the first pre- The set time is changed from a single state to a connected state to P1 to P8. That is, after the connection port group 411 is connected to the external connector 421, 埠P1 is connected to 埠P2, 埠P3 is connected to 埠P4, 埠P5 is connected to 埠P6, and 埠P7 is connected to 埠P8. The connector 421 can be a network route in which four ports are fixed or other wiring devices.

However, in order for the test device 300 of the switch not to enter the test mode, the test device 300 of the switch designs a set of methods for starting the test mode. First, the ports of the same transmission port group, such as 埠P1~P8, P8~P16, and P17~P24, of the above-mentioned transmission port group 411, 412 or 413 must be connected within the first preset connection time. The control circuit 310 determines the connection status of all the 埠P1~P24 of one of the transmission port groups 411~413 in the preset connection time to set the standby flag. In detail, the control circuit 310 determines which one of the transmission port groups 411 to 413 is connected first, and starts counting the count value after determining that one of the ports is connected (assuming 埠P1). Then, when the time count value is equal to the first preset connection time, the control circuit 310 determines whether all the 埠P1~P8 of the transmission port group 411 are connected and none of the normal packets are received (the normal packet detector 350 is not Triggered), if the result of the determination is yes, the standby flag is set. Conversely, if the result of the determination is no, the switch is returned to the normal mode. Such a design mechanism makes it difficult for the switch 400 to enter the test mode unless the external connector 421 is used in combination. This is the first level to avoid the switch entering the test mode.

When the standby flag is set, the control circuit 310 causes the packet generator 320 to send an error data packet to one of the connected port groups 411 (for example, 埠P1) according to the standby flag. And the 资料P2 forming a connection with 埠P1 receives the erroneous data packet. If the error data packet can be received on the 埠P2, it indicates that the transmission port group 411 of the switch 400 determines that the connection is to be tested, and is not in the normal use state (the switch does not function during normal use). Docking them together.)

The error data packet counter 342 receives the error data packet at the record control circuit 310. The error data packet counter 342 is initially set to have a count value of "0". When the control circuit 310 receives an error data packet from 埠P2, the error data packet counter 342 increments its count value to "1". In addition, please note that if the switch 400 is in the normal mode, the ports in the same transmission port group happen to be connected at the same time, because the switch 400 will send the error data packet and confirm whether it is actually in the test mode. At this time, the switch connected to the switch 400. Or when other devices receive the error data packet, the error packet will be filtered out, and the error packet will not be forwarded, causing a malfunction in the normal mode, which is why the error data packet is used as the test mode confirmation mode. The switch 400 also terminates the test mode detection because the error data packet is not received. The above described error packet mechanism forms a second level that prevents the switch 400 from entering the test mode.

Then, all the 埠P9~P16 of the transmission port group 412 of the switch 400 must also be connected by the external connector 422 within the preset connection time, and then all the 埠P17~P24 of the port group 413 are also transmitted. It is necessary to be connected by the external connector 423 within a preset connection time. These connections and the determination of whether or not the connection method is completed are similar to the connections of all the ports P1 to P8 of the above-mentioned transmission port group 411, and are not described here. After all the transmission port groups 411 to 413 are determined to complete the above connection one by one, and no normal packet is received, the switch testing device 300 starts the test mode. This is the third level to avoid the switch entering the test mode.

It is worth mentioning that the number of the port group is the same as the number of external connectors, that is, when the number of the port group is N, the number of external connectors is also N, and N is a positive integer.

After entering the test mode, the virtual local area network setting circuit 330 sets the configuration of the switch 400. The action of this setting configuration is to make the 埠P1~P24 in the transmission port group 411~413 in the switch 400 in series. connection. Since the switch 400 has previously used the external connectors 421-423 to connect the 埠P1 and the 埠P2, the 埠P3 and the 埠P4 are connected to each other, the 埠P21 and the 埠P22 are connected to each other, and the 埠P23 and 埠P24 are connected to each other, Therefore, the virtual area network setting circuit 330 only needs to set 埠P2 and 埠P3 to be internally connected to each other, and 埠P4 and 埠P5 are internally connected to each other. 埠P20 and 埠P21 are connected to each other and 埠P22 and 埠P23 are connected to each other, so In the first place, all of the ports P1 to P24 of the switch 400 can form a connected state in series.

Please note that the above-mentioned 埠P1~P24 series connection status is only an example. The series connection order of 埠P1~P24 can also be P2 → P1 → P3 → P4.... or other series connection status, not indicating埠P1~P24 must be connected in series according to the number order.

After the serial connection state of 埠P1~P24 is completed, the packet generator 320 starts to send a plurality of correct data packets to the first one of the serial ports of the switch 400, as shown in FIG. 4, the packet generator 320 sends the correct packet data to 埠P1. And these correct packet data will be transmitted by 埠P1 along the tandem 埠P2~P24 to the last 埠P24 of the tandem 埠.

The correct data packet counter 341 counts the number of correct packet data received by 埠P24 of control circuit 310. Once the correct data packet counter 341 counts out, the number of correct packet data received by the P24 is equal to the number of correct data packets sent by the packet generator 320, indicating that the switch 400 has no packet loss, that is, the tested switch 400 The test results are successful. Conversely, if the correct data packet counter 341 counts out and the number of correct packet data received by the P24 is not equal to the number of correct data packets sent by the packet generator 320, it indicates that the test result of the tested switch 400 is a failure.

In the following, two different embodiments are proposed for the test method of the switch of the present invention to further illustrate the implementation of the test method of the switch of the present invention.

Please refer to FIG. 5A and FIG. 5B. FIG. 5A and FIG. 5B are flowcharts showing an embodiment of a test method of the switch of the present invention. First, it is determined that the connection state of all the ports of one of the transmission port groups is changed from a single connection state to a connection state to a total connection state in the first preset connection time, and no normal packet is received, and the other All the attachments of the transmission port group are still in the non-connected state, and the standby flag is set (step S511). Next, the error data packet is sent to one of the ports of the transmission port group according to the standby flag (step S512). Then, it is judged whether one of the ports other than the error data packet transmitted by the transmission port group has received the error data packet (step S513). If the result of the determination in step S513 is NO, the switch stops the test mode and returns to the normal mode (step S530). On the other hand, if the result of the determination in step S513 is YES, it is determined that each of the unconnected transmission port groups has a connection state of all the first connection connection times and none of the normal packets are received (step S514). When all the ports of all the transmission port groups complete the connection within the preset time and none of the normal packets are received, the switch starts the test mode (step S515).

After entering the test mode, the configuration of the switch is set such that the switches of the switch are connected in series (step S516). Next, M correct data packets are transmitted from the first one of the series connected ,, where M is a positive integer (step S517). Then, after the third preset test time, the number R of correct data packets received at the last frame of the serial port is counted (step S518). After the counting operation of step S518 is completed, the number M of the correct data packets is transmitted and the number R of received correct data packets is compared (step S519). When the number M of transmitted correct data packets is not equal to the number R of received correct data packets, it indicates that the switch test result is a failure (step S521). Conversely, when the number M of transmitted correct data packets is equal to the number R of received correct data packets, it indicates that the switch test result is successful (step S520).

Referring to FIG. 6A to FIG. 6E and FIG. 4 simultaneously, FIG. 6A to FIG. 6E are flowcharts showing another embodiment of the testing method of the switch 400 of the present invention.

First, referring to FIG. 6A, first, return to zero and restart the counting time count value (step S612), and then determine whether the 埠 of one of the transmission port groups G1 is connected within the second preset time (step S613). , 614), if the result of the determination is no, the switch 400 returns to the normal mode (step S611). It is assumed here that the earliest connection port appears in the transmission port group G1. If the 埠 of one of the transmission port groups G1 is connected, it returns to zero and restarts the count time count value (step S615). Next, it is determined whether the time count value is equal to the first preset connection time (step S616), and once the time count value is equal to the first preset connection time, it is determined whether all ports of the transmission port group G1 are connected, and other transmission ports are connected. Whether or not all of the groups G2 and G3 are not connected (step S617). If the result of the determination is no, the switch 400 returns to the normal mode (step S611). If the result of the determination is yes, it is further determined whether all the frames have not received the normal packet, that is, the normal packet detector is not triggered (step S618). If the result of the determination is no, the switch 400 returns to the normal mode (step S611). If the result of the determination is YES, the standby flag of the transmission port group G1 is set to "1" (step S619).

Next, referring to FIG. 6B, when the standby flag is set to "1", it is judged whether or not the number of error data packets EC is 0 (step S621), and if not, the switch 400 returns to the normal mode (step S611). If so, an error data packet is transmitted to 埠P1 (step S622), and P1 is a port of the transmission port group G1. Next, it is judged whether or not the number of error data packets EC is 1 (step S623). If not, the switch 400 returns to the normal mode (step S611), and if so, it is determined again whether only the transmission port group G1 is in the connected state and the transmission port groups G2 and G3 are not connected (step S624). If not, the switch 400 returns to the normal mode (step S611). If so, it continues to determine whether all the packets have not received the normal packet, that is, the normal packet detector is not triggered (step S625). If the result of the determination is no, the switch 400 returns to the normal mode (step S611). If the result of the determination is YES, the step illustrated in FIG. 6C is continued by the node S1. The number of error data packets EC in the above is changed from "0" to "1" to indicate that an error data packet transmitted by 埠P1 is received at the 连接 connected to 埠P1.

Next, referring to FIG. 6C, first, return to zero and restart the counting time count value (step S631), and then determine whether the 埠 of one of the transmission port groups G2 is connected within the second preset time (step S632). , S633), if the result of the determination is no, the switch 400 returns to the normal mode (step S611). Conversely, if the result of the determination is YES, the zero is returned and the count time count value is restarted (step S634). Next, it is determined whether the time count value is equal to the first preset connection time (step 5635). If the determination result is no, wait and stay at step S635. If the determination result is yes, determine all the ports of the transmission port group G1, G2. All are connected, and all the ports of the transmission port group G3 are not connected (step S636). If the result of the determination in step S636 is NO, the switch 400 returns to the normal mode (step S611). If the result of the determination is yes, it continues to judge whether all the frames have not received the normal packet, that is, the normal packet detector is not triggered (step S637). If the result of the determination is no, the switch 400 returns to the normal mode (step S611). If the result of the determination is YES, the step illustrated in FIG. 6D is continued by the node S2.

Next, referring to FIG. 6D, first, return to zero and restart the counting time count value (step S641), and then determine whether the 埠 of one of the transmission port groups G3 is connected within the second preset time (step S642). , S643), if the result of the determination is no, the switch 400 returns to the normal mode (step S611), and if the result of the determination is YES, it returns to zero and restarts the count time count value (step S644). Next, it is determined whether the time count value is equal to the first preset connection time (step S645). If the determination result is no, wait and stay at step S645. If the determination result is yes, determine the transmission port groups G1, G2, G3. All the tricks are connected (step S646). If the decision result in the step S646 is NO, the switch 400 returns to the normal mode (step S611). If the result of the determination in step S646 is YES, it continues to determine whether all the frames have not received the normal packet, that is, the normal packet detector is not triggered (step S647). If the result of the determination is no, the switch 400 returns to the normal mode (step S611). If the result of the determination is YES, the test mode is started (step S648).

The purpose of steps S613, S632, and S642 is to prevent the transmission port groups G1, G2, and G3 from being connected until the switch is always stuck in the detection test mode.

In the present embodiment, steps S622 and S623 transmit and check an error data packet for checking only the first connected transmission port group G1. In practical applications, it is also possible to check the transmission port group G2 or G3 or check all the transmission port groups.

After entering the test mode, the process illustrated in FIG. 6E is performed. Please refer to FIG. 6E below. First, set the configuration of the switch 400 so that 埠P2, P4, P6, P8, P10, P12, P14, P16, P18, P20, and P22 are respectively connected to 埠P3, P5, P7, P9, P11, P13, P15, P17, P19, P21, and P23 (step S651). After the configuration steps of the configuration of the switch 400 described above are completed, the external connectors of the switches P1 to P24 of the switch 400 are brought into a state in which the switches P1 to P24 of the switch 400 are connected in series.

After the configuration setting of the switch 400 described above is completed, the zero count is reset and the count time count value is restarted (step S652), and transmitted to the 埠P1 1000 correct data packets (step S653), and then, it is determined whether the time count value is equal to The third preset measurement time (step S654). If the result of the determination is yes, check whether 埠P24 receives 1000 correct data packets. If the result of the determination is no, the test result of the switch 400 is incorrect (step S656). If the result of the determination is yes, the test result of the switch 400 is correct (step S657). . After completing the test of the switch 400, the switch 400 resumes the normal mode (step S611).

In summary, the present invention utilizes the connection mode of a special switch, and uses the same transmission port group to complete the connection within a preset connection time to determine whether to enter the test mode. In addition, in order to prevent all the computers from being turned on at the same time, the switch enters the test mode in the normal mode, and also transmits and receives the error data packet and the normal packet cannot be detected during the test mode detection process. Avoid entering the test mode. In addition, the present invention also proposes a test mode in accordance with the above-mentioned connection mode of the switch to complete the test of the switch.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100, 300. . . Switch test set

110, 200, 400. . . switch

120. . . Switch test equipment

210. . . Test circuit

310. . . Control circuit

320. . . Packet generator

330. . . Virtual area network setting circuit

340. . . Packet counter

350. . . Normal packet detector

411~413. . . Transmit port group

341. . . Correct data packet counter

342. . . Error data packet counter

S511~S530, S611~S657. . . Switch test procedure

P1~PN. . . port

CTRL. . . control signal

FIG. 1 is a schematic diagram of a conventional switch test apparatus 100.

FIG. 2 is a schematic diagram of a switch 200 with a test circuit built therein.

FIG. 3 illustrates an embodiment of a switch test apparatus 300 of the present invention.

FIG. 4 is a schematic diagram of a switch 400 according to an embodiment of the present invention.

5A and 5B are flow diagrams showing an embodiment of a test method of a switch of the present invention.

6A-6E are flow diagrams showing another embodiment of a test method of the switch 400 of the present invention.

S511~S515, S530. . . Switch test procedure

Claims (16)

A test method for a switch, the switch is divided into N transfer port groups, and the transfer port groups have a plurality of ports, wherein N is a positive integer, and the steps include: when the transfer port groups are When any one of the ports becomes a connected state, determining a connection state of each of the ports of the one of the transmission port groups in a first preset connection time, and thereby setting a standby flag; a flag, sending an error data packet to one of the ports of the one of the transmission port groups; determining whether the one of the ports other than the error data packet sent by the transmission port group is received The error data packet; and respectively determining that the unconnected each of the transmission port groups should complete the connection state one by one, and all the ports of the same port group should be changed by only a single connection state in a first preset connection time All of them are connected, and each of the switches does not receive a normal packet, and thereby initiates a test mode. The test method of the switch according to claim 1, wherein “determining the connection state of all the ports of the transmission port group within the first preset connection time, and thereby setting the standby flag” The step includes: when determining that one of the 埠 of the i-th transmission port group is connected, starting counting a time count value, where i is a positive integer less than or equal to N; and when the time count value is equal to the When the first preset connection time is determined, it is determined that all the ports of the i-th transmission port group are connected and none of them are received normally. When the packet is wrapped, the standby flag is set. The test method of the switch according to claim 1, wherein “determining the unconnected each port group should complete the connection state one by one, and all the ports of the same port group should be at the first preset connection time. The step of converting only the single state to the connection state to all, is the connection state, and thereby starting the test mode includes: when it is judged that one of the nodes of the jth transmission port group is connected, Zero and restart counting the time count value, where j is a positive integer less than or equal to N, and j is not equal to i; when the time count value is equal to the first preset connection time, determining the jth pass Whether all of the ports of the port group are connected and the connected ports have not received a connection check action of the normal packet; and when the connection check action determines all of the collection port groups The test mode is initiated when the connections are completed. The test method of the switch according to claim 1, wherein any one of the ports in each of the collection port groups is connected in pairs. The test method of the switch according to claim 4, the method further comprising: configuring the switch when the test mode is started, so that the ports in the switch are connected in series. The method for testing a switch according to item 5 of the patent application, the method further comprising: transmitting, by the first one of the series, the correct data packets, M is a positive integer; and after a third preset test time, counts the number of correct data packets received by the last one of the arrays in series; and compares the number of correct data packets sent And the number of the correct data packets received to determine the test result of the switch. A test method for a switch, the switch is divided into N transfer port groups, the transfer port groups have a plurality of ports, and any two of the ports of the transfer port group are connected in pairs. Where N is a positive integer, and the steps include: setting a configuration of the switch such that the ports in the plurality of transmission port groups in the switch are connected in series; and transmitting the M by the first one of the ports in series a correct data packet, wherein M is a positive integer; after a third predetermined test time, counting the number of correct data packets received by the last one of the arrays in series; and comparing the correct data The number of packets sent and the number of correct data packets received to determine the test result of the switch. A test device for a switch is built in the switch, and the ports of the switch are divided into N transmission port groups, and the transmission port groups have a plurality of ports, and N is a positive integer, including: a control circuit And connecting the 埠 of the plurality of transmission port groups for packet transmission by the ;; a packet generator coupled to the control circuit and the 埠, the packet generator is controlled by the control circuit Transmitting it to the sputum by generating a data packet One of the virtual area network setting circuits coupled to the control circuit for setting the configuration of the switch; a packet counter coupled to the control circuit for counting the number of data packets received by the control circuit; And a normal packet detector coupled to the control circuit for detecting whether the normal packet is received, wherein the packet generator sends an error data packet to the transmission port group according to a standby flag One of them is one of those 埠. The test device of the switch of claim 8, wherein the control circuit determines a connection state of all the ones of the one of the plurality of transmission port groups within a first preset connection time, and thereby Set the standby flag. The test device of the switch according to claim 9, wherein the control circuit determines that each of the unconnected transceiver port groups is connected in a second preset connection time after the last transmission port group is connected. Start the link, and start all the clicks after the link. When the first preset connection time is changed from a single connection state to a full connection state, all the connections that have completed the connection are not received normally. When the packet is encapsulated, a test mode is started. The test device of the switch of claim 8, wherein the control circuit determines whether one of the ports other than the port of the transmission port group that sent the error data packet receives the error data packet. . The test device of the switch according to claim 8 , further comprising: N external connectors, which are respectively connected to the N transmission port groups of the switch, and each of the transmission port groups respectively The external connector connects any two of the turns in pairs over a plurality of different time periods. The test apparatus of the switch of claim 12, wherein when the test mode is started, the virtual local area network setting circuit configures the switch, and the external connectors are used to enable the transmission in the switch. The ports in the receiving port group are connected in series. The test apparatus of the switch according to claim 13 , wherein the packet generator transmits M correct data packets by the first one of the plurality of switches in series, wherein M is a positive integer. The test device of the switch according to claim 14, wherein the packet counter counts the number of the correct data packets transmitted by the control circuit. The test device of the switch of claim 14, wherein the packet counter comprises: a correct data packet counter coupled to the control circuit for counting the last 埠 received by the tandem The number of the correct data packets; and an error data packet counter coupled to the control circuit for counting the number of error data packets received by the plurality of transmission port groups that complete the connection.