TWI813159B - System for detecting connection status of network devices and status transmission method thereof - Google Patents

Abstract

The invention is to provide a system for detecting connection status of network devices and status transmission method thereof, which is the status data corresponded to the connection status corresponded to a network conversion device or a network bridge module to be filled into a reserved block or an optional block of a network packet. Hereby, the invention is to provide a host to detect the connection status between network devices on transmission paths of a remote module according to corresponded status data.

Description

Network device connection status detection system and method thereof

The present invention relates to a detection system and a method thereof, in particular to a detection system and method for the connection status of a network device.

Generally speaking, network devices on each endpoint on the network are connected to each other through links, nodes or switches. As network devices are connected to each other, the distribution of large and small network paths is called network topology. Common network topologies include Mesh, Star, Ring, Tree and Bus. However, with the rapid development of the Internet, the application of various remote modules requires subordinate personnel to perform traditional network management, that is, network management personnel use network management systems or network management software to manage large-scale computer networks and telecommunications. Network maintenance and management, so network administrators need to monitor and manage a lot of status information from different network endpoints at the same time, such as the operating status of network devices and the actual status of network devices between endpoints. The connection status, and even the connection port number information corresponding to the network device on each endpoint, etc.

The Internet of Things (IoT) is a computer device that is connected in series with a mechanical device or digital device through a network transmission protocol. Among the mechanical devices or digital devices, each IoT device has a universal unique identifier (UID) and has With the ability to transmit data through the network, the IoT device can provide detection data to the control center in real time, and can also drive the corresponding remote module to perform corresponding actions based on the control signals or data provided by the control center, thus bringing reality All mechanical operation or observation data in the world have been converted into digital data, which has led to widespread applications today, such as logistics management and street light control. Therefore, the Internet of Things attaches great importance to network troubleshooting and maintenance.

Although, the existing remote module can pass the network fault status to the network bridge module with network management function by using the failover function (link fault pass through), and then the host can obtain the network through the network management system. Fault status to know that there is a network fault in the network section from the network bridge module to the remote module, such as connection failure or abnormal network speed.

However, when the remote module is connected to the network bridge module through at least one network module, the network bridge module cannot provide accurate network fault status through the failover function, that is, it cannot provide Which transmission path connection fails between the remote module and the network bridge module requires network management personnel to troubleshoot the cause of the failure one by one, thus making maintenance difficult for network management personnel.

Based on the above problems, the present invention provides a system and method for detecting the connection status of a network device, which writes corresponding status parameters through unused blocks in data packets, thereby detecting remote modules. The connection status between the remote module and the network bridge module can be used to determine which transmission path between the remote module and the network bridge module is disconnected, so that network administrators can easily manage and repair failed transmissions. path.

One object of the present invention is to provide a system and method for detecting the connection status of a network device, which fills in the corresponding status parameters in the data packet through the connection status between the remote module and the network bridge module. The unused block is used to detect the connection status of the transmission path of a remote module.

In order to achieve the above purpose, the present invention discloses a method for detecting the connection status of a network device, which first uses a network conversion module to detect a first connection port of the network conversion module through a first transmission The path connects the connection status of a remote module and generates a first status parameter correspondingly. The network conversion module then fills the first status parameter into an unused block of a first data packet, and then The first data packet is transmitted to a network bridge module through a second transmission port; then, the network bridge module accesses the first status parameter and detects a third transmission of the network bridge module The port is connected to the connection status of the network conversion module via a second transmission path, and a second status parameter is generated correspondingly, and the second status parameter is filled in an unused block of a second data packet; when When the first status parameter is No or unknown, the second data packet corresponds to the disconnection of the first transmission path; when the second status parameter is No or unknown, the second data packet corresponds to the disconnection of the first transmission path. The material packet corresponds to the disconnection of the first transmission path and the second transmission path. In this way, the present invention can automatically detect whether the transmission path between network modules is disconnected, and there is no need to set the network conversion module as a network management device to reduce costs.

The present invention provides an embodiment, wherein after the step of the network bridging module filling the second status parameter of the second transmission packet into the unused block of the data packet, the network bridging module further includes The group transmits the second data packet to a host through a fourth transmission port; the host reads the first status parameter and the second status parameter according to the second data packet, which is used to determine the first transmission path and the second status parameter. Whether the second transmission path is disconnected.

The present invention provides an embodiment, wherein the first data packet and the second data packet correspond to a link layer discovery protocol or a transmission control protocol, and the network bridging module and the network conversion module support an Ethernet Internet Protocol.

The present invention provides an embodiment, wherein in the step of a network conversion module detecting the connection status of a first connection port of the network conversion module connected to a remote module through a first transmission path, the The network conversion module receives a first transmission packet of the remote module through the first transmission path, or sends a first detection packet to the remote module, so that the remote module transmits the first transmission Packet to the network conversion module or detect a first connection signal status of the first transmission port of the network conversion module corresponding to the first transmission path, which is used to detect the first connection port A first transmission path connects the connection status of the remote module and generates the first status parameter accordingly.

The present invention provides an embodiment, wherein the network bridging module accesses the first status parameter and detects that a third transmission port of the network bridging module is connected to the network conversion module through a second transmission path. In the step of connecting state, the network bridging module receives a second transmission packet of the network conversion module through the second transmission path, or the network bridging module further sends a second detection packet to The network conversion module causes the network conversion module to transmit the second transmission packet to the network bridging module, or the network bridging module detects the third transmission port corresponding to the second transmission path. A second connection signal state is used to detect the connection state of the third transmission port to the network conversion module through the second transmission path and generate the second state parameter accordingly.

The present invention provides an embodiment, wherein the first status parameter of the remote module corresponds to a first device status of a link layer discovery protocol or a first transmission status of a transmission control protocol, and the second status parameter The network conversion module is a second device state corresponding to the link layer discovery protocol or a second transmission state corresponding to the transmission control protocol.

The present invention further discloses a method for detecting the connection status of a network device. The method first uses a first network conversion module to detect a first transmission port of the first network conversion module through a first transmission path. Connect the connection status of a remote module and generate a first status parameter correspondingly, and then the first network conversion module fills the first status parameter into an unused block of a first data packet, Then, the first data packet including the first status parameter is transmitted to a second network conversion module through a second transmission port; then, the second network conversion module accesses the first status parameter and Detect the connection status of a third transmission port of the second network conversion module connected to the first network conversion module through a second transmission path, generate a second status parameter correspondingly, and continue to connect the first network conversion module The status parameter and the second status parameter are filled in an unused block of a second data packet, and then the second data packet including the first status parameter and the second status parameter is sent to the network bridge module. ; Thereafter, the network bridging module accesses the first status parameter and the second status parameter and detects that a fifth transmission port of the network bridging module is connected to the second network through a third transmission path Convert the connection status of the module, correspondingly generate a third status parameter, and fill the first status parameter, the second status parameter and the third status parameter into the unused block of the third data packet; when When the first status parameter is No or unknown, the data packet corresponds to the disconnection of the first transmission path; when the second status parameter is No or unknown, the third data packet corresponds to the connection between the first transmission path and the The second transmission path is disconnected; when the third status parameter is No or unknown, the data packet corresponds to the first transmission path, the second transmission path and the third transmission path being disconnected. In this way, the present invention can automatically detect whether the transmission path between network modules is disconnected, and there is no need to set the first network conversion module and the second network conversion module as network management devices to reduce costs. .

The present invention provides another embodiment, wherein after the step of the network bridging module filling the third status data of the third transmission packet into the unused block of the data packet, the network bridging module further includes: The module transmits the third data packet to a host through a sixth transmission port; the host The data packet reads the first status parameter, the second status parameter and the third status data, which is used to determine whether the first transmission path, the second transmission path and the third transmission path are disconnected.

The present invention provides another embodiment, wherein the first data packet, the second data packet and the third data packet correspond to a link layer discovery protocol or a transmission control protocol, the first network conversion module, the The second network conversion module and the network bridge module support an Ethernet protocol.

The present invention provides another embodiment, in which a first network conversion module detects the connection status of a first transmission port of the first network conversion module connected to a remote module through a first transmission path. In the step, the first network conversion module receives a first transmission packet of the remote module through the first transmission path, or sends a first detection packet to the remote module. The end module causes the remote module to transmit the first transmission packet to the first network conversion module, or detect the first connection signal status of the first transmission port, which is used to detect the third A transmission port connects the connection status of the remote module through the first transmission path and generates the first status parameter accordingly.

The present invention provides another embodiment, wherein the second network conversion module accesses the first status parameter and detects that a third transmission port of the second network conversion module is connected to the second transmission path through a second transmission path. In the connection status step of the first network conversion module, the second network conversion module receives a second transmission packet of the first network conversion module through a second transmission path, or sends a first Two detection packets are sent to the first network conversion module, so that the first network conversion module sends the second transmission packet to the second network conversion module, or detects a first transmission packet of the third conversion transmission port. Two connection signal states, which are used to generate the second state signal.

The present invention provides another embodiment, in which a fifth transmission port of the network bridge module is connected to the second network through a third transmission path after accessing the first status parameter and the second status parameter and detecting the network bridge module. In the step of converting the connection status of the module, the network bridge module receives a third transmission packet of the second network conversion module through the third transmission path, or sends a third detection packet to the second network conversion module. Two network conversion modules, causing the second network conversion module to transmit the third transmission packet to the network bridge module, or detect the third connection signal status of the fifth transmission port, which is used to Detect the connection status of the fifth transmission port connected to the second network conversion module through the third transmission path and generate the third status signal accordingly.

The present invention further provides a detection system for the connection status of a network device, which is used to detect the connection status of a transmission path of a remote module; the detection system includes a remote module, a network switch The module and a network bridging module; the network conversion module is connected to the remote module through a first transmission path; the network bridging module is connected to the network conversion module through a second transmission path; wherein The network conversion module detects the connection status of a first transmission port of the network conversion module connected to the remote module through the first transmission path and generates a first status parameter accordingly. The network conversion module The group fills the first status parameter into a first data packet and forwards it to the network bridge module through a second transmission port. The network bridge module accesses the first status parameter and detects the network bridge connection. A third transmission port of the module is connected to the connection status of the network conversion module through the second transmission path to generate a second status parameter correspondingly. The network bridge module combines the first status parameter with the second status parameter. The status parameter is filled in a second data packet. When the first status parameter is No or unknown, the second data packet corresponds to the disconnection of the first transmission path. When the second status parameter is No or unknown, The second data packet corresponds to the disconnection of the second transmission path. In this way, the present invention can automatically detect whether the transmission path between network modules is disconnected, and there is no need to set the network conversion module as a network management device to reduce costs.

The present invention provides yet another embodiment, which further includes a host connected to the network bridging module, wherein the network bridging module processes the second data packet including the first status parameter and the second status parameter. A fourth transmission port is forwarded to the host. The host determines that the first transmission path is disconnected based on whether the first status parameter is negative or unknown. The host determines that the first transmission is disconnected based on whether the second status parameter is negative or unclear. The path is disconnected from the second transmission path.

The present invention provides yet another embodiment, in which the network conversion module receives a first transmission packet of the remote module through a first transmission path, or sends a first detection packet to the remote module, so that The remote module sends the first transmission packet to the network conversion module, or detects a first connection signal status of the first transmission port, which is used to detect the connection status of the first transmission path And correspondingly generate the first status parameter; the network bridging module receives a second transmission packet of the network conversion module through a second transmission path, or sends a second detection packet to the network conversion module , causing the network conversion module to send the second transmission packet to the network bridging module, or detect the second connection signal status of the third transmission port, which is used to detect the second transmission path The connection state and correspondingly generate the second state parameter.

The present invention provides yet another embodiment, wherein the transmission interface of the second transmission path is different from the transmission interface of the first transmission path, and the first data packet and the second data packet correspond to a link layer discovery protocol or a Transmission Control Protocol, the network bridge module and the network conversion module support an Ethernet protocol.

The present invention also provides a detection system for the connection status of a network device, which is applied to the first data packet and the second data packet; the detection system includes a first network conversion module, a second network A channel conversion module and a network bridge module; the first network conversion module is connected to the remote module through a first transmission path; the second network conversion module is connected to the third through a second transmission path A network conversion module; the network bridging module is connected to the second network conversion module through a third transmission path; wherein the first network conversion module detects one of the first network conversion modules The first transmission port connects the connection status of the remote module through the first transmission path and generates a first status parameter accordingly. The first network conversion module fills the first status parameter into a first data packet. And forwarded to the second network conversion module through a second transmission port, the second network conversion module accesses the first status parameter and detects a third transmission port of the second network conversion module The connection status of the first network conversion module via the second transmission path generates a second status parameter correspondingly, and the second network conversion module fills in the first status parameter and the second status parameter. A second data packet is forwarded to the network bridging module through a fourth transmission port. The network bridging module accesses the first status parameter and the second status parameter and detects the network bridging module. A fifth transmission port is connected to the connection status of the second network conversion module through the third transmission path, and a third status parameter is correspondingly generated. The network bridge module converts the first status parameter, the second The status parameter and the third status parameter are filled in a third data packet. When the first status parameter is No or unknown, the third data packet corresponds to the disconnection of the first transmission path. When the second status parameter is When no or unknown, the third data packet corresponds to the disconnection of the second transmission path. When the third status parameter is no or unknown, the third data packet corresponds to the disconnection of the third transmission path. In this way, the present invention can automatically detect whether the transmission path between network modules is disconnected, and there is no need to set the network conversion module as a network management device to reduce costs.

The present invention provides another embodiment, which further includes a host connected to the network bridging module, wherein the network bridging module will include the first status parameter, the second status parameter and the third status data. The third data packet is forwarded to the host via a sixth transmission port, and the host The parameter is no or unknown and the first transmission path is disconnected. The host determines that the second transmission path is disconnected based on the second status parameter being no or unknown. The host determines that the third status parameter is no or unknown. The third transmission path is disconnected.

The present invention provides yet another embodiment, wherein the transmission interface of the second transmission path is different from the transmission interfaces of the first transmission path and the third transmission path, and the first data packet, the second data packet and the third The data packet corresponds to a link layer discovery protocol or a transmission control protocol, and the first network conversion module, the second network conversion module and the network bridging module support an Ethernet protocol.

The present invention provides another embodiment, wherein the first network conversion module receives a first transmission packet of the remote module through the first transmission path, or sends a first detection packet to the remote module. , causing the remote module to send the first transmission packet to the first network conversion module, or detect the first connection signal status of the first transmission port, which is used to detect the first network A first transmission port of the conversion module is connected to the connection status of the remote module through the first transmission path; the second network conversion module receives the connection status of the first network conversion module through the second transmission path. A second transmission packet, or a second detection packet sent to the first network conversion module, so that the first network conversion module sends the second transmission packet to the second network conversion module, or Detecting a second connection signal state of the third transmission port is used to detect that a third transmission port of the second network conversion module is connected to the first network conversion module through the second transmission path connection status, and correspondingly generates the second status parameter; the network bridging module receives a third transmission packet of the second network conversion module through the third transmission path, or sends a third detection packet to the second network conversion module, causing the second network conversion module to send the third transmission packet to the network bridging module, or detect the third connection signal status of the fifth transmission port, and It is used to detect the connection status of the network bridge module connected to the second network conversion module through the third transmission path, and generate the third status parameter accordingly.

1:Detection system

2:Detection system

10:Host

12: Processing unit

14:Memory

16:Storage unit

102: Host transmission port

20:Remote module

202: Control processing unit

204:Remote transmission port

22:Network conversion module

222:Control processing unit

224: First transmission port

226: Second transmission port

24:Network bridging module

242:Control processing unit

244:Third transmission port

246: Fourth transmission port

30:Host

32: Processing unit

302: Host transmission port

40:Remote module

402: Control processing unit

404:Remote transmission port

42:The first network conversion module

422: Control processing unit

424: First transmission port

426: Second transmission port

44: Second network conversion module

442: Control processing unit

444: Third transmission port

446: Fourth transmission port

46:Network bridging module

462:Control processing unit

464: Fifth transmission port

466:Sixth transmission port

DPACK1: First data packet

DPACK2: Second data packet

DPACK11: First data packet

DPACK12: Second data packet

DPACK13: Third data packet

DU1: First transmission packet

DU2: Second transmission packet

DU11: First transmission packet

DU12: Second transmission packet

DU13: The third transmission packet

FIN1: First detection packet

FIN2: Second detection packet

FIN11: First detection packet

FIN12: Second detection packet

FIN13: The third detection packet

LINK: data link layer

P1: first transmission path

P2: Second transmission path

P3: Third transmission path

P11: First transmission path

P12: Second transmission path

P13: Third transmission path

P14: The fourth transmission path

PK1: Use blocks

PK2: Unused block

S1: first status parameter

S2: Second state parameter

S11: First status parameter

S12: Second status parameter

S13: The third status parameter

S10 to S18: Steps

S100 to S220: Steps

Figure 1: It is a flow chart of detecting connection status according to an embodiment of the present invention; Figures 2A to 2C: It is a schematic diagram of some steps of an embodiment of the present invention; Figure 3A to Figure 3C: This is a schematic diagram of some steps of another embodiment of the present invention; Figure 4: It is a flow chart of detecting the connection status of yet another embodiment of the present invention; Figure 5A Figures 1 to 5D are partial step schematic diagrams of yet another embodiment of the present invention; and Figures 6A to 6D are partial step schematic diagrams of yet another embodiment of the present invention.

In order to enable the review committee to have a further understanding and understanding of the characteristics and effects of the present invention, examples and accompanying descriptions are provided as follows: In view of the fact that in the conventional technology, the network management system controls the remote device Manual operations due to complex management operations cannot accurately determine the address or cannot easily identify the network segment where the connection failed, thus causing maintenance difficulties. Accordingly, the present invention proposes a detection system and method for the connection status of network devices. , to solve the maintenance difficulties caused by conventional network management technology.

In the following, the present invention will further describe the characteristics provided by a system and method for detecting the connection status of a network device and the matching system: First, please refer to the first figure, which is a detection system according to an embodiment of the present invention. Flow chart for testing connection status. As shown in the figure, the method for detecting the connection status of a network device of the present invention performs the following steps: Step S10: The network conversion module detects the first transmission path between itself and the remote module and generates a corresponding The first status parameter; Step S12: The network conversion module fills the first status parameter into the unused block of the first data packet, and sends the first data packet to the network bridging module; Step S14: The network bridging module The group detects the second transmission path between itself and the network conversion module and generates the second status parameter accordingly; step S16: the network bridge module fills the second status parameter into the unused block of the second data packet , and transmit the second data packet to the host; and step S18: the host reads the first status parameter and the second status parameter, which are used to determine whether the first transmission path and the second transmission path are disconnected.

Please refer to Figures 2A to 2C together, which illustrate the detection system 1 used in conjunction with the method for detecting the connection status of a network device of the present invention, which is used to detect a host 10 and a remote module. Whether the transmission path between the groups 20 is disconnected, the detection system 1 includes a network conversion module 22 and a network bridge module 24. The host 10 in this embodiment is a computer host with a processing unit 12 as an example. , but is not limited to this. It can also be a server, a notebook computer, a tablet computer, or an electronic device with basic data reading capabilities and logical computing capabilities, all of which are the host 10 referred to in the present invention. The remote module 20 is connected to the network conversion module 22, the network conversion module 22 is connected to the network bridging module 24, and the host 10 is connected to the network bridging module 24. In this embodiment, the remote The terminal module 20 and the network conversion module 22 are connected to each other through a first transmission path P1, and the network conversion module 22 and the network bridging module 24 are connected to each other through a second transmission path P2. , the network bridging module 24 and the host 10 are connected through a third transmission path P3 (for example: the network bridging module 24 and the host 10 are connected through a network cable).

Furthermore, in this embodiment, the network conversion module 22 transmits a data packet (Data Packet) DPACK to the host 10 through the network bridge module 24 according to a data link layer (Data link layer) LINK. The data link layer LINK is between the physical layer (Physical Layer) and the network layer (Network Layer) in the Open System Interconnection Model (OSI). The purpose of the data link layer LINK is for network For path addressing, error detection and error correction, general network devices will add the header (Header) and the end (END) in the data packet. The data packet in this embodiment corresponds to a link layer discovery Protocol (Link Layer Discovery Protocol, LLDP), which is one of the network protocols of the data link layer LINK. Generally, network devices use this LLDP to notify other network devices of their own status through the network they are connected to.

The remote module 20 of this embodiment is provided with a control processing unit 222 and a remote transmission port 204. The network conversion module 22 is provided with a control processing unit 222, a first transmission port 224 and a second transmission port 226. The network bridge module 24 is provided with a control processing unit 242, a third transmission port 244 and a fourth transmission port 246. The host 10 is further provided with a host transmission port 102. The first transmission path P1 is far away from the remote module 20 The end transmission port 204 is connected to the first transmission port 224 of the network conversion module 22, and the second transmission path P2 is the second transmission port 226 of the network conversion module 22 connected to the third transmission port 244 of the network bridge module 24. The third transmission path P3 is the fourth transmission port 246 of the network bridge module 24 connected to the host transmission port 102 of the host 10 .

Continuing from the above, the network conversion module 22 and the network bridging module 24 of this embodiment, and even the remote module 20 and the host 10 discover the protocol data unit (Link Layer) through the link layer corresponding to the LLDP. Discovery Protocol Data Unit (LLDPDU), which enables all devices on the network to advertise and discover each other. The first data packet DPACK1 and the second data packet DPACK2 corresponding to the data link layer LINK respectively contain a used block PK1 and an unused block PK2. For example: the LLDP LLDPDU contains required blocks and optional blocks. The selected block, that is, TLV, is the abbreviation of type, length, and value. TLV includes required blocks, optional blocks, and reserved blocks. The data format of TLV is as follows: Table 1:

Therefore, the data format definition based on TLV is as follows in Table 2:

Among them, the 1st to 3rd categories of TLV are required blocks, the 4th to 8th categories and 127th category of TLV are optional blocks, and the 9th to 126th categories of TLV are reserved blocks. In this embodiment, The 1st to 3rd types of TLV (TLV1-TLV3) are used blocks PK1 to fill in the first data packet DPACK1 and the second data packet DPACK2, while the 127th type of TLV (TLV127) is an optional block and is generally not used by the system. The unused block PK2 is used and is therefore set as the unused block PK2 of the first data packet DPACK1 and the second data packet DPACK2 in this embodiment. However, the present invention is not limited thereto, and the reserved block or other optional block of the TLV can be used to be set as the unused block PK2 of the first data packet DPACK1 and the second data packet DPACK2.

In step S10, as shown in Figure 2A, the network conversion module 22 detects the connection status between itself and the remote module 20. In this embodiment, the remote module 20 will The LLDP sends a first transmission packet DU1 to the network conversion module 22. The network conversion module 22 detects the network by whether it receives the first transmission packet DU1 of the remote module 20. channel conversion module 22 and the remote The connection status between the modules 20 is to detect whether the first transmission path P1 between the network conversion module 22 and the remote module 20 is disconnected.

Among them, based on LLDP, once the network connection status of the corresponding transmission port changes, a transmission packet will be sent to the adjacent network device via the corresponding transmission port. In this embodiment, the remote module 20 sends the first transmission packet. For example, when transmitting the packet DU1 to the network conversion module 22, a control processing unit 222 of the remote module 20 detects that a remote transmission port 204 is connected to the first transmission port 224 of the network conversion module 22. The remote transmission port 204 transmits the first transmission packet DU1 to the first transmission port 224 of the network conversion module 22, so that the network conversion module 22 receives the first transmission packet DU1 and generates a first status parameter accordingly. S1; Following step S12, the control processing unit 222 of the network conversion module 22 fills the first status parameter S1 into the unused block PK2 (for example: TLV TYPE127) of the first data packet DPACK1, And the network conversion module 22 sends the first data packet DPACK1 to the third transmission port 244 of the network bridging module 24 through the second transmission port 226.

In step S14, as shown in Figure B, the network bridging module 24 detects the connection status between itself and the network conversion module 22. In this embodiment, the network bridging module 24 receives the A second transmission packet DU2 is sent by the network conversion module 22. The network bridging module 24 detects the network by whether it receives the second transmission packet DU2 from the network conversion module 22. The connection status between the conversion module 22 and the network bridge module 24 is to detect whether the second transmission path P2 between the network conversion module 22 and the network bridge module 24 is disconnected.

Among them, based on LLDP, similarly, this embodiment uses the network conversion module 22 to send the second transmission packet DU2 to the network bridging module 24 as an example, and the control processing unit 222 of the network conversion module 22 detects The second transmission port 226 of the network conversion module 22 is connected to the third transmission port 244 of the network bridge module 24, so that the second transmission packet is transmitted through the first transmission port 224 of the network conversion module 22 DU2 is connected to the third transmission port 244 of the network bridge module 24, thereby allowing the network bridge module 24 to correspondingly generate a second status parameter S2.

Further, continuing in step S16, the network bridging module 24 fills the second status parameter S2 into the unused block PK2 of the second data packet DPACK2, and the network bridging module 24 The second data packet DPACK2 is sent to the host 10 via a fourth transmission port 246 and a third transmission path P3.

In step S18, as shown in Figure 2C, the host 10 in this embodiment is connected to the network bridge module 24 from the third transmission path P3, and is received by the host 10 through the third transmission path P3. The data packet DPACK is received, thereby receiving the data packet DPACK transmitted from the network bridge module 24, whereby the host 10 reads the first status parameter S1 and the second status parameter S2 in the data packet DPACK. , which is used to determine which of the first transmission path P1 and the second transmission path P2 is disconnected based on the first state parameter S1 and the second state parameter S2. When the first state parameter S1 is When none, the host 10 determines that the first transmission path P1 is disconnected. When the second status parameter S2 is none, the host 10 determines that the first transmission path P1 and the second transmission path P2 are disconnected.

In this embodiment, the host 10 is used to determine the second data packet DPACK2, but the invention is not limited thereto. When the first status parameter S1 is negative or unknown, the second data packet DPACK2 corresponds to the first transmission The path P1 is disconnected. When the second status parameter S2 is negative or unknown, the second data packet DPACK2 corresponds to the first transmission path P1 and the second transmission path P2 being disconnected. Therefore, when an electronic device can determine When the first status parameter S1 and the second status parameter S2 are negative or unknown, the host 10 can be replaced, or even the network bridge module 24 integrates this logical judgment function, and controls the processing unit 242 through its Use your own judgment. Among them, the unused block PK2 is a plurality of parameter values, which correspond to the connection status of the transmission paths, for example: parameter A to parameter F, and parameters A and B correspond to the first transmission port of the local device. and the system status of the second transmission port. Parameters C and D are the system status of the first transmission port and the second transmission port of the first neighboring device before the local device. Parameters D and F are the second neighboring device before the local device. The system status of the first transmission port and the second transmission port of the device (that is, the first adjacent device before the first adjacent device), and the parameter contents of parameter A to parameter F are X, Y, and N, which represent offline and online respectively. and unknown system status, thus allowing the network bridge module 24 to obtain the connection status of the adjacent network module. The connection statuses of the first transmission path P1 and the second transmission path P2 in this embodiment are respectively Corresponds to the parameter content of parameter D and parameter B.

In the above embodiment, when the host 10 supports LLDP, step S16 and step S18 are executed. In addition, the data packet can also be received for other network managed terminal devices that support LLDP. DPACK and determine the first status parameter S1 and the second status parameter S2, such as a network-managed switch or a network-managed router.

In the above embodiment, the network bridging module 24 functions as a switching hub (Switch HUB) or a hub (HUB), and the network conversion module 22 functions as a photoelectric converter, especially The network conversion module 22 and the network bridge module 24 support Ethernet. Therefore, the first transmission path P1 is an optical fiber network, and the second transmission path P2 is a cable network or In the twisted pair network, that is, the first transmission path P1 and the second transmission path P2 are different transmission interfaces.

As shown in the third Figure A to the third Figure C, the difference from the second Figure A to the second Figure C is that the network conversion module 22 in the third Figure A to the third Figure C sends a first detection packet. FIN1 to the remote module 20, and the network bridge module 24 sends a second detection packet FIN2 to the network conversion module 22. Therefore, this embodiment is based on the assumption that the transmission control protocol (TCP) is used between the remote module 20 and the network bridge module 24 . Referring back to the first figure, in step S10, the network conversion module 22 sends the first detection packet FIN1 to the remote module 20, so that the remote module 20 uses the first transmission packet DU1 as a confirmation packet. and sent to the network conversion module 22, which is used to detect the connection status of the first transmission path P1; in step S14, the network bridge module 24 sends the second detection packet FIN2 to the network The conversion module 22 causes the network conversion module 22 to use the second transmission packet DU2 as a confirmation packet and transmit it to the network bridge module 24, which is used to detect the connection status of the second transmission path P2; The remaining steps are the same as in the previous embodiment and will not be described again.

In addition to being connected to the remote module 20 through a single network conversion module 22, the network bridging module 24 of the present invention can further be connected between the network bridging module 24 and the remote module 20. Another network conversion module is further added, that is, a transmission path is added between the network bridge module 24 and the remote module 20 , and the transmission interface is converted again, as further described below.

Please refer to Figure 4, which is a flow chart of detecting connection status according to another embodiment of the present invention. As shown in the figure, the method for detecting the connection status of a network device of the present invention performs the following steps: Step S100: The first network conversion module detects the first transmission path between itself and the remote module and Correspondingly generate the first state parameter; Step S120: The first network conversion module fills the first status parameter into the unused block of the first data packet, and sends the data packet to the second network conversion module; Step S140: The second network conversion module Detect the second transmission path between itself and the first network conversion module and generate the second status parameter accordingly; Step S160: The second network conversion module fills the second status parameter into the unused part of the second data packet block, and transmits the second data packet to the network bridging module; Step S180: The network bridging module detects the third transmission path between itself and the second network conversion module and generates a third status parameter accordingly; Step S200: The network bridging module fills the third status parameter into the unused block of the third data packet, and sends the third data packet to the host; and Step S220: The host reads the first status parameter and the second status The parameter and the third status parameter are used to determine whether the first transmission path, the second transmission path and the third transmission path are disconnected.

Please refer to Figures 5A to 5D together, which are the detection system 2 used in conjunction with the method for detecting the connection status of a network device of the present invention, which is used to detect a host 30 and a remote end. Whether the transmission path between the modules 40 is disconnected, the detection system 2 includes a first network conversion module 42, a second network conversion module 44 and a network bridging module 46. In this embodiment The host 30 is a computer host with a processing unit 32 as an example, but it is not limited to this. It can also be a server, a notebook computer, a tablet computer, or a computer host with data reading capabilities and logical operations. The capability-based electronic devices are all the host 30 referred to in the present invention. In this embodiment, the remote module 40, the first network conversion module 42, the second network conversion module 44 and the network bridging module 46. In this embodiment, the remote module 40 The first network conversion module 42 is connected to each other through a first transmission path P11, and the first network conversion module 42 and the second network conversion module 44 are connected to each other through a second transmission path P12. The second network conversion module 44 and the network bridging module 46 are connected to each other through a third transmission path P13, and the network bridging module 46 and the host 30 are connected through a fourth transmission path P13. The path P14 is connected, and the first network conversion module 42 transmits a data packet (Data Packet) DPACK to the host 20 through the network bridge module 46 according to a data link layer LINK.

The remote module 40 of this embodiment is provided with a control processing unit 402 and a remote transmission port 404. The first network conversion module 42 is provided with a control processing unit 422, a first transmission port 424 and a second Transmission port 426. The second network conversion module 44 is provided with a control processing unit 442, a third transmission port 444 and a fourth transmission port 446. The network bridge module 46 is provided with a control processing unit 462, a third transmission port 446. There are five transmission ports 464 and a sixth transmission port 466. The host 30 is further provided with a host transmission port 302. The first transmission path P11 is the remote transmission port 404 of the remote module 40 connected to the first network conversion module. The first transmission port 424 of 42, the second transmission path P12 is the second transmission port 426 of the first network conversion module 42 connected to the third transmission port 444 of the second network conversion module 44, the third The transmission path P13 is the fourth transmission port 446 of the second network conversion module 44 connected to the fifth transmission port 464 of the network bridge module 46 , and the fourth transmission path P14 is the sixth transmission of the network bridge module 46 Port 466 is connected to the host transmission port 302 of the host 30 .

In step S100, as shown in Figure 5A, the first network conversion module 42 detects the connection status between itself and the remote module 40. In this embodiment, the first network conversion module 42 detects the connection status between itself and the remote module 40. The module 42 receives a first transmission packet DU11 sent by the remote module 40. The first network conversion module 42 determines whether the first transmission packet DU11 of the remote module 40 is received. Detecting the connection status between the first network conversion module 42 and the remote module 40 , that is, detecting the first connection status between the first network conversion module 42 and the remote module 40 Whether the transmission path P11 is disconnected. Based on LLDP, the remote module 40 sends the first transmission packet DU11 to the first network conversion module 42 as an example, which is detected by the control processing unit 402 of the remote module 40 The remote transmission port 404 of the remote module 40 is connected to the first transmission port 424 of the first network conversion module 42, so that the first transmission packet is transmitted through the remote transmission port 404 of the remote module 40 DU11 is connected to the first transmission port 424 of the first network conversion module 42, so that the first network conversion module 42 correspondingly generates a first status parameter S11.

Continuing in step S120, the first network conversion module 42 fills the first status parameter S11 corresponding to the connection status of the first transmission path P11 into the unused block PK2 in a first data packet DPACK11. , and the first network conversion module 42 sends the first data packet DPACK11 including the first status parameter S11 to the second network conversion module 44 through the second transmission port 426.

In step S140, as shown in Figure 5B, the second network conversion module 44 detects the connection status between itself and the first network conversion module 42. In this embodiment, the second network conversion module 44 detects the connection status between itself and the first network conversion module 42. Internet transfer The module switching module 44 receives a second transmission packet DU12 sent by the first network switching module 42. The second network switching module 44 determines whether it has received the second transmission packet DU12 from the first network switching module 42. The second transmission packet DU12 is used to detect the connection status between the first network conversion module 42 and the second network conversion module 44, that is, to detect the connection status between the first network conversion module 42 and the third network conversion module 42. Whether the second transmission path P12 between the two network conversion modules 44 is disconnected.

Continuing the above, based on LLDP, similarly, this embodiment takes the first network conversion module 42 to send the second transmission packet DU12 to the second network conversion module 44 as an example. The control processing unit 422 of the conversion module 42 detects that the second transmission port 426 of the first network conversion module 42 is connected to the third transmission port 444 of the second network conversion module 44, and therefore passes the first network The second transmission port 426 of the channel conversion module 42 transmits the second transmission packet DU12 to the third transmission port 444 of the second network conversion module 44, thereby allowing the second network conversion module 44 to generate a corresponding Two status parameters S12, and further read the first status parameter S11 of the first data packet DPACK11; continuing in step S160, the second network conversion module 44 converts the first status parameter S11 and the second transmission path The second status parameter S12 corresponding to whether P12 is disconnected is filled in the unused block PK2 in a second data packet DPACK12, and the second network conversion module 44 will include the first status parameter S11 The second data packet DPACK12 and the second status parameter S12 are sent to the network bridge module 46 through the fourth transmission port 446.

In step S180, as shown in Figure 5C, the network bridging module 46 detects the connection status between itself and the second network conversion module 44, that is, the network bridging module 46 receives the A third transmission packet DU13 is sent by the second network conversion module 44. The network bridging module 24 detects whether it receives the third transmission packet DU13 of the second network conversion module 44. Detect the connection status between the second network conversion module 44 and the network bridging module 46, that is, detect the third connection state between the second network conversion module 44 and the network bridging module 46. Whether the transmission path P13 is disconnected, which is based on LLDP. Similarly, in this embodiment, the second network conversion module 44 sends the third transmission packet DU13 to the network bridging module 46 as an example. The control processing unit 442 of the network conversion module 44 detects that the fourth transmission port 446 of the second network conversion module 44 is connected to the fifth transmission port 464 of the network bridge module 46, and therefore passes the second The fourth transmission port 446 of the network conversion module 44 transmits the third transmission packet DU13 to the network. The fifth transmission port 464 of the road bridge module 46 is configured to allow the network bridge module 46 to correspondingly generate a second status parameter S13.

Continuing in step S200, the network bridging module 46 fills the first status parameter S11, the second status parameter S12 and a third status parameter S13 corresponding to whether the third transmission path P13 is disconnected into a third The unused block PK2 in the data packet DPACK13, and the network bridging module 46 will include the first status parameter S11, the second status parameter S12 and the third status parameter S13 of the third data packet DPACK13 Sent to the host 30 via the sixth transmission port 466.

In step S220, as shown in Figure 5D, the host 30 in this embodiment is connected to the network bridge module 46 through the fourth transmission path P14, and thus receives the network bridge module 46 from the network bridge module 46. Data packet DPACK13, the host 30 thereby reads the first status parameter S11, the second status parameter S12 and the third status parameter S13 in the data packet DPACK13, which is used according to the first status parameter S11, The second state parameter S12 and the third state parameter S13 determine which one of the first transmission path P11, the second transmission path P12, and the third transmission path P13 is disconnected. When the first state parameter is When No or unknown, the host 30 determines that the first transmission path P11 is disconnected. When the second status parameter is No or unknown, the host 30 determines that the second transmission path P12 is disconnected. When the third status parameter is If no or unknown, the host 30 determines that the third transmission path P13 is disconnected.

Continuing from the above, the unused block PK2 is a plurality of parameter values, which correspond to the connection status of the transmission paths, for example: parameter A to parameter F, and parameters A and B are corresponding to the third parameter of the local device. The system status of a transmission port and a second transmission port. The parameters C and D are the system status of the first transmission port and the second transmission port of the first neighboring device before the local device. The parameters D and F are the system status of the first neighboring device before the local device. The system status of the first transmission port and the second transmission port of two adjacent devices (that is, the first adjacent device before the first adjacent device), and the parameter contents of parameter A to parameter F are X, Y, and N, respectively representing Offline, online and unknown system status, thus allowing the network bridge module 46 to obtain the connection status of the adjacent network module. In this embodiment, the first transmission path P11 and the second transmission path P12 are The connection status of the three transmission paths P13 corresponds to the parameter contents of parameter F, parameter D and parameter B respectively.

In the above embodiment, the network bridging module 46 functions as a switching hub (Switch HUB) or a hub (HUB). The first network conversion module 42 and the second network conversion module are connected to each other. The function of the group 44 is equivalent to a photoelectric converter. In particular, the first network conversion module 42, the second network conversion module 44 and the network bridge module 46 support Ethernet. Therefore, the second transmission path P12 is an optical fiber network, and the first transmission path P11 and the third transmission path P13 are a cable network or a twisted pair network, that is, the transmission protocol of the second transmission path P12 is different from The transmission protocol of the first transmission path P11 and the third transmission path P13 means that the transmission interface of the second transmission path P12 is different from the transmission interface of the first transmission path P11 and the third transmission path P13.

As shown in Figures 6A to 6D, the difference from Figures 5A to 5D is that the network conversion module 22 in Figures 6A to 6D sends a first detection packet. FIN11 to the remote module 20, and the network bridge module 24 sends a second detection packet FIN12 to the network conversion module 22. Therefore, this embodiment is based on the assumption that the transmission control protocol (TCP) is used between the remote module 20 and the network bridge module 24 . Referring back to the first figure, in step S100, the first network conversion module 42 sends the first detection packet FIN11 to the remote module 40, so that the remote module 40 uses the first transmission packet DU11 as The confirmation packet is sent to the first network conversion module 42, which is used to detect the connection status of the first transmission path P11; in step S140, the second network conversion module 44 sends the second detection The packet FIN12 is sent to the first network conversion module 42, so that the first network conversion module 42 uses the second transmission packet DU12 as a confirmation packet and sends it to the second network conversion module 44; in step S180 , the network bridging module 46 sends the third detection packet FIN13 to the second network conversion module 44, so that the second network conversion module 44 uses the third transmission packet DU13 as a confirmation packet and transmits it to the Network bridging module 46; the remaining steps are the same as in the previous embodiment, so they will not be described again.

The above-mentioned embodiment uses detection packets to detect whether there is a reply transmission packet as a detection method for detecting the connection status. Another embodiment is to directly detect the connection signal status of the corresponding transmission port, for example: The first network conversion module 42 detects a first connection signal state of its first transmission port 424 to detect the connection state of the corresponding first transmission path P11. Similarly, the second network conversion module The group 44 and the network bridge module 46 can detect the corresponding second transmission path P12 and the third transmission path by detecting the connection signal status of the corresponding third transmission port 444 and the fifth transmission port 464. The connection status of P13 therefore corresponds to the second status parameter S12 and the third status parameter S13.

The above-described embodiment uses a single TLV127 block to store the unused block PK2 of the data packet DPACK. However, the present invention is not limited to this. It can also use multiple TLV127 blocks to store the unused block PK2 of the data packet DPACK. Use block PK2.

In summary, the system and method for detecting the connection status of a network device of the present invention fills in the corresponding status parameters in the unused blocks set in the data packet, so as to provide the data packet with unused information. The block corresponds to the connection status of the transmission path, thus allowing the host to determine the disconnected transmission path, thereby providing a more accurate network fault status.

Therefore, this invention is indeed novel, progressive and can be used industrially. It should undoubtedly comply with the patent application requirements of my country’s Patent Law. I file an invention patent application in accordance with the law and pray that the Office will grant the patent as soon as possible. I am deeply grateful.

However, the above are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention. All changes and modifications can be made equally in accordance with the shape, structure, characteristics and spirit described in the patent scope of the present invention. , should be included in the patent scope of the present invention.

Steps S10 to S18

Claims (17)

A method for detecting the connection status of a network device. The steps include: a network conversion module detects a connection of a first connection port of the network conversion module to a remote module through a first transmission path. line status, and correspondingly generates a first status parameter; the network conversion module fills the first status parameter into an unused block of a first data packet, and transmits the first data through a second transmission port The packet is sent to a network bridge module; the network bridge module accesses the first status parameter and detects that a third transmission port of the network bridge module is connected to the network conversion module through a second transmission path connection status, and correspondingly generates a second status parameter; and the network bridging module fills the first status parameter and the second status parameter into an unused block of a second data packet; wherein, When the first status parameter is No or unknown, the first data packet corresponds to the disconnection of the first transmission path; when the second status parameter is No or unknown, the second data packet corresponds to the second transmission The path is disconnected; the first data packet and the second data packet correspond to a link layer discovery protocol. The method for detecting the connection status of a network device as described in claim 1, wherein the network bridge module fills a second status parameter of the second transmission packet into the unused block of the data packet After the steps, it further includes: the network bridge module transmits the second data packet to a host through a fourth transmission port; and the host reads the first status parameter and the second status according to the second data packet. Parameter used to determine whether the first transmission path and the second transmission path are disconnected. The method for detecting the connection status of a network device as described in claim 1, wherein a network conversion module detects that a first connection port of the network conversion module is connected through a first transmission path. In the step of receiving the connection status of a remote module, the network conversion module receives a first transmission packet of the remote module through the first transmission path, or sends a first detection packet to the remote module. The end module enables the remote module to transmit the first transmission packet to the network conversion module or detect a first connection of the first transmission port of the network conversion module corresponding to the first transmission path. The signal status is used to detect the connection status of the first connection port to the remote module via a first transmission path and generate the first status parameter accordingly. The method for detecting the connection status of a network device as described in claim 1, wherein the first status parameter is accessed in the network bridge module and a third transmission port of the network bridge module is detected via a In the step of connecting the second transmission path to the connection status of the network conversion module, the network bridging module receives a second transmission packet of the network conversion module through the second transmission path, or the network The bridge module further sends a second detection packet to the network conversion module, causing the network conversion module to send the second transmission packet to the network bridge module, or the network bridge module detects the third A second connection signal state of the third transmission port corresponding to the two transmission paths is used to detect the connection state of the third transmission port to the network conversion module through the second transmission path and generate the corresponding Second status parameter. A method for detecting the connection status of a network device, the steps include: a first network conversion module detects that a first transmission port of the first network conversion module is connected to a remote end through a first transmission path The connection status of the module, and correspondingly generates a first status parameter; the first network conversion module fills the first status parameter into an unused block of the first data packet, and transmits it through a second The port transmits the first data packet to a second network conversion module; the second network conversion module accesses the first status parameter and detects a third transmission port of the second network conversion module A second transmission path is connected to the connection status of the first network conversion module, correspondingly generating a second status parameter; The second network conversion module fills the first status parameter and the second status parameter into an unused block of a second data packet, and transmits the second data packet to a network through a fourth transmission port. A road bridge module; the network bridge module accesses the first status parameter and the second status parameter and detects that a fifth transmission port of the network bridge module is connected to the second network through a third transmission path The connection status of the channel conversion module correspondingly generates a third status parameter; and the network bridging module fills the first status parameter, the second status parameter and the third status parameter into a third data packet. An unused block; wherein, when the first status parameter is No or unknown, the third data packet corresponds to the disconnection of the first transmission path; when the second status parameter is No or unknown, the third data packet The third data packet corresponds to the disconnection of the second transmission path; when the third status parameter is No or unknown, the third data packet corresponds to the disconnection of the third transmission path; the first data packet, the second data The packet and the third data packet correspond to a link layer discovery protocol. The method for detecting the connection status of a network device as described in claim 5, wherein the first status parameter, the second status parameter and the third status parameter are filled in a third status parameter in the network bridge module. After the step of one unused block of the data packet, it further includes: the network bridge module transmits the third data packet to a host; and the host reads the first status parameter and the second status according to the data packet. The parameter and the third status parameter are used to determine whether at least one of the first transmission path to the third transmission path is disconnected. The method for detecting the connection status of a network device as described in claim 5, wherein a first network conversion module detects a first transmission port of the first network conversion module through a first transmission path In the step of connecting the connection status of a remote module, the first network conversion module receives a first transmission packet of the remote module through the first transmission path, or sends a first detection packet to The remote module causes the remote module to transmit the first transmission packet to the first network conversion module, or detect a first connection of the first transmission port The signal status is used to detect the connection status of the first transmission port to the remote module through the first transmission path and generate the first status parameter accordingly. The method for detecting the connection status of a network device as described in claim 5, wherein the second network conversion module accesses the first status parameter and detects a third of the second network conversion module In the step of connecting the transmission port to the connection status of the first network conversion module through a second transmission path, the second network conversion module receives one of the first network conversion modules through a second transmission path. the second transmission packet, or a second detection packet is sent to the first network conversion module, so that the first network conversion module transmits the second transmission packet to the second network conversion module, or detects A second connection signal status of the third conversion transmission port is detected, which is used to generate the second status signal. The method for detecting the connection status of a network device as described in claim 5, wherein the first status parameter and the second status parameter are accessed and the fifth transmission port of the network bridge module is detected via a In the step of connecting the third transmission path to the connection status of the second network conversion module, the network bridging module receives a third transmission packet of the second network conversion module through the third transmission path, or A third detection packet is further sent to the second network conversion module, so that the second network conversion module sends the third transmission packet to the network bridge module, or detects one of the fifth transmission ports. The third connection signal state is used to detect the connection state of the fifth transmission port to the second network conversion module through the third transmission path and generate the third state signal accordingly. A detection system for the connection status of a network device, which is used to detect the connection status of a transmission path of a remote module. The detection system includes: a network conversion module, through a first transmission path Connect the remote module; and a network bridge module connects to the network conversion module through a second transmission path; wherein the network conversion module detects a first transmission port of the network conversion module The connection status of the remote module is connected through the first transmission path and a first status parameter is generated correspondingly. The network conversion module fills the first status parameter into a first data packet and transmits it through a second port forwarded to the network bridge module, the network bridge module Access the first status parameter and detect the connection status of a third transmission port of the network bridge module connected to the network conversion module through the second transmission path and correspondingly generate a second status parameter. The road bridge module fills the first status parameter and the second status parameter into a second data packet. When the first status parameter is negative or unknown, the second data packet corresponds to the first transmission path interruption. line, when the second status parameter is negative or unknown, the second data packet corresponds to the disconnection of the second transmission path; the first data packet and the second data packet correspond to a link layer discovery protocol. The system for detecting the connection status of a network device as described in claim 10 further includes: a host connected to the network bridge module; wherein the network bridge module will include the first status parameter and the third The second data packet with two status parameters is forwarded to the host. The host determines that the first transmission path is disconnected based on whether the first status parameter is negative or unknown. The host determines based on whether the second status parameter is negative or unclear. The first transmission path and the second transmission path are disconnected. The system for detecting the connection status of a network device as described in claim 10, wherein the network conversion module receives a first transmission packet of the remote module through a first transmission path, or sends a first transmission packet to the remote module via a first transmission path. Detect the packet to the remote module, causing the remote module to send the first transmission packet to the network conversion module, or detect the first connection signal status of the first transmission port, which is used to detect Detect the connection status of the first transmission path and generate the first status parameter accordingly; the network bridging module receives a second transmission packet of the network conversion module through a second transmission path, or sends a first The second detection packet is sent to the network conversion module, so that the network conversion module sends the second transmission packet to the network bridging module, or detects the second connection signal status of the third transmission port, which is Used to detect the connection status of the second transmission path and generate the second status parameter accordingly. The system for detecting the connection status of a network device as described in claim 10, wherein the first transmission path and the second transmission path are different transmission interfaces, and the network bridging module and the network conversion module support a Ethernet. A detection system for the connection status of a network device, which is used to detect the connection status of a transmission path of a remote module. The detection system includes: a first network conversion module, through a first The transmission path is connected to the remote module; a second network conversion module is connected to the first network conversion module through a second transmission path; and a network bridge module is connected to the first network conversion module through a third transmission path. a second network conversion module; wherein the first network conversion module detects the connection status of a first transmission port of the first network conversion module connected to the remote module through the first transmission path and Correspondingly, a first status parameter is generated. The first network conversion module fills the first status parameter into a first data packet and forwards it to the second network conversion module through a second transmission port. The second network conversion module The network conversion module accesses the first status parameter and detects the connection status of a third transmission port of the second network conversion module connected to the first network conversion module through the second transmission path and responds accordingly Generating a second status parameter, the second network conversion module fills the first status parameter and the second status parameter into a second data packet and forwards it to the network bridging module through a fourth transmission port, The network bridge module accesses the first status parameter and the second status parameter and detects that a fifth transmission port of the network bridge module is connected to the second network conversion module through the third transmission path. connection state, and correspondingly generates a third state parameter. The network bridging module fills the first state parameter, the second state parameter and the third state parameter into a third data packet. When the first state When the parameter is No or unknown, the third data packet corresponds to the disconnection of the first transmission path. When the second status parameter is No or unknown, the third data packet corresponds to the disconnection of the second transmission path. When When the third status parameter is no or unknown, the third data packet corresponds to the third The transmission path is disconnected; the first data packet, the second data packet and the third data packet correspond to a link layer discovery protocol. The system for detecting the connection status of a network device as described in claim 14 further includes: a host connected to the network bridging module; wherein the network bridging module includes the third transmission port via a sixth transmission port The third data packet of a status parameter, the second status parameter and the third status parameter is forwarded to the host. The host determines that the first transmission path is disconnected based on whether the first status parameter is negative or unknown. The host The host determines that the second transmission path is disconnected based on whether the second status parameter is negative or unknown, and the host determines that the third transmission path is disconnected based on whether the third status parameter is negative or unknown. The system for detecting the connection status of a network device as described in claim 14, wherein the first network conversion module receives a first transmission packet from the remote module through the first transmission path, or sends a first transmission packet to the remote module via the first transmission path. The first detection packet is sent to the remote module, causing the remote module to send the first transmission packet to the first network conversion module, or to detect the first connection signal status of the first transmission port, which It is used to detect the connection status of a first transmission port of the first network conversion module connected to the remote module through the first transmission path; the second network conversion module passes through the second transmission path Receive a second transmission packet from the first network conversion module, or send a second detection packet to the first network conversion module, so that the first network conversion module sends the second transmission packet to The second network conversion module may detect the second connection signal status of the third transmission port, which is used to detect the third transmission port of the second network conversion module through the second transmission The path connects the connection status of the first network conversion module and generates the second status parameter correspondingly; the network bridge module receives a third transmission of the second network conversion module through the third transmission path packet, or send a third detection packet to the second network conversion module, so that the second network conversion module sends the third transmission packet to the network bridge module, or detects the fifth transmission The third connection signal status of the port is used to detect the network bridge module The connection status of the second network conversion module is connected through the third transmission path, and the third status parameter is generated accordingly. The system for detecting the connection status of a network device as described in claim 14, wherein the transmission interface of the second transmission path is different from the transmission interfaces of the first transmission path and the third transmission path, and the first network The conversion module, the second network conversion module and the network bridge module support an Ethernet network.