CN106209552B - Plug and play networking method, device and system - Google Patents

Abstract

The embodiment of the present invention provides a kind of plug and play network-building method, apparatus and system, and using in looped network one meshed network transmission device sends test packet as test packet promoter to looped network；After present node web-transporting device listens to the test packet that previous node web-transporting device is sent, extract sender's bridge MAC Address in test packet, it is compared with the bridge MAC Address of present node web-transporting device, sender's bridge MAC Address in the test packet that the big person of bridge MAC Address is sent as present node web-transporting device to latter meshed network transmission device；The maximum meshed network transmission device of looped network jackshaft MAC Address is found out based on the test packet after one circle of circulation forwarding；The message that the secondary port of the obstruction maximum meshed network transmission device of bridge MAC Address makes it be only capable of receiving target MAC (Media Access Control) address test packet multicast address.The present invention can effectively avoid broadcast storm, improve the reliability and stability of looped network.

Description

Plug and play networking method, device and system

technical field

The invention relates to the technical field of digital information transmission, in particular to a plug-and-play networking method, device and system.

Background technique

Ethernet ring network, referred to as ring network, is a ring network system composed of a group of node network devices. Since each node network device is only physically connected to two adjacent node network devices, the network wiring investment of the ring network is less; because the two node network devices in the ring network can communicate directly or indirectly, and The maximum time of text transmission in the ring network is fixed, so the ring network has good real-time performance and high reliability.

Ring network supports point-to-point, point-to-multipoint, multipoint-to-multipoint and other network communication services; ring network supports unicast, multicast, broadcast and other network data communication modes, which can effectively prevent data disorder and duplication. However, in the broadcast network data communication mode, a broadcast message sent by the sender node network device to the ring network broadcast address will be copied and transmitted to all node network devices by the ring network. The broadcast message floods the ring network and occupies a large amount of ring network bandwidth. , resulting in performance degradation of the ring network, or even paralysis, that is, a broadcast storm occurs.

Therefore, eliminating the broadcast storm in the ring network is a technical problem expected to be solved in the field of network communication technology.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a plug-and-play networking method, device and system that can effectively avoid broadcast storms, so as to improve the reliability and stability of the ring network.

In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present invention are as follows:

In the first aspect, an embodiment of the present invention provides a plug-and-play networking method, which is applied to a node network transmission device used to construct a ring network. When the node network transmission device is used as the current node network transmission device through which a message passes, The secondary port is used to monitor and receive the message sent by the network transmission device of the previous node in the ring network, and the primary port is used to send the message to the network transmission device of the next node in the ring network; the method includes:

A node network transmission device in the ring network is used as the initiator of the test message to send a test message to the ring network; wherein, the destination MAC address in the test message is the multicast address of the test message, and the sender bridge MAC address in the test message The address is the bridge MAC address of the originator of the test packet;

After the network transmission device of the current node monitors the test message sent by the network transmission device of the previous node, it extracts the sender's bridge MAC address in the test message, compares it with the bridge MAC address of the network transmission device of the current node, and compares the The larger MAC address is used as the sender bridge MAC address in the test packet sent by the network transmission device of the current node to the network transmission device of the next node;

Find out the node network transmission device with the largest bridge MAC address in the ring network based on the test message after cyclic forwarding one circle;

Block the secondary port of the network transmission device of the node with the largest bridge MAC address so that it can only receive packets whose destination MAC address is the multicast address of the test packet.

In the second aspect, an embodiment of the present invention also provides a plug-and-play networking device, which is applied to a node network transmission device used to construct a ring network. When the node network transmission device is used as the current node network transmission device through which the message passes , its secondary port is used to monitor and receive messages sent by the network transmission equipment of the previous node in the ring network, and its primary port is used to send messages to the network transmission equipment of the next node in the ring network; the device includes:

The test message initiating unit is used to send a test message to the ring network with a network transmission device of a node in the ring network as the test message initiator; wherein, the destination MAC address in the test message is the multicast address of the test message, and the test message The sender bridge MAC address in the message is the bridge MAC address of the originator of the test message;

The sender bridge MAC address comparison and adjustment unit, the sender bridge MAC address comparison adjustment unit includes a sender bridge MAC address extraction unit, a bridge MAC address comparison unit, and a sender bridge MAC address modification unit;

The sender bridge MAC address extraction unit is used to extract the sender bridge MAC address in the test message after the current node network transmission device monitors the test message sent by the previous node network transmission device;

a bridge MAC address comparison unit, configured to compare the sender bridge MAC address in the test message with the bridge MAC address of the current node network transmission device;

The sender bridge MAC address adjustment unit is used to use the bridge MAC address with the larger bridge MAC address as the sender bridge MAC address in the test message sent by the current node network transmission device to the next node network transmission device;

Select the unit of the node network transmission device with the largest bridge MAC address, and find out the node network transmission device with the largest bridge MAC address in the ring network based on the test message after cyclic forwarding for one circle;

The node network transmission device setting unit with the largest bridge MAC address is used to block the secondary port of the node network transmission device with the largest bridge MAC address so that it can only receive packets whose destination MAC address is the multicast address of the test packet.

In a third aspect, an embodiment of the present invention also provides a plug-and-play networking system, including a node network transmission device, where the node network transmission device includes a microprocessor and a memory, and the microprocessor bus connects the memory; multiple node network transmission devices The devices are connected to the ring network in sequence according to the ring topology. When the node network transmission device is used as the current node network transmission device through which the message passes, its secondary port is used to monitor and receive the messages sent by the previous node network transmission device in the ring network. message, whose main port is used to send the message to the network transmission equipment of the next node in the ring network;

The system also includes a plug-and-play networking device, the plug-and-play networking device is installed in the memory and includes one or more software function modules executed by the microprocessor;

Plug and Play networking devices include:

The test message initiating unit is used to send a test message to the ring network with a network transmission device of a node in the ring network as the test message initiator; wherein, the destination MAC address in the test message is the multicast address of the test message, and the test message The sender bridge MAC address in the message is the bridge MAC address of the originator of the test message;

The sender bridge MAC address comparison and adjustment unit, the sender bridge MAC address comparison adjustment unit includes a sender bridge MAC address extraction unit, a bridge MAC address comparison unit, and a sender bridge MAC address modification unit;

The sender bridge MAC address extraction unit is used to extract the sender bridge MAC address in the test message after the current node network transmission device monitors the test message sent by the previous node network transmission device;

a bridge MAC address comparison unit, configured to compare the sender bridge MAC address in the test message with the bridge MAC address of the current node network transmission device;

The sender bridge MAC address adjustment unit is used to use the bridge MAC address with the larger bridge MAC address as the sender bridge MAC address in the test message sent by the current node network transmission device to the next node network transmission device;

Select the unit of the node network transmission device with the largest bridge MAC address, and find out the node network transmission device with the largest bridge MAC address in the ring network based on the test message after cyclic forwarding for one circle;

The node network transmission device setting unit with the largest bridge MAC address is used to block the secondary port of the node network transmission device with the largest bridge MAC address so that it can only receive packets whose destination MAC address is the multicast address of the test packet.

In the plug-and-play networking method, device and system provided by the embodiments of the present invention, in the cyclic forwarding process of the test message, each time the test message passes through a current node network transmission device, based on the sender in the monitored test message The bridge MAC address is compared with the bridge MAC address of the current node's network transmission device, and the sender's bridge MAC address in the test packet forwarded by the current node's network transmission device is modified to the one with the larger bridge MAC address, so that the cyclically forwarded The sender's bridge MAC address in the test packet is the bridge MAC address of the node network transmission device with the largest bridge MAC address on the ring network. Use this bridge MAC address to find the node network transmission device with the largest bridge MAC address on the upper ring network. The secondary port of the largest node network transmission device is blocked so that it can only receive the packets whose destination MAC address is the multicast address of the test packet, and the packets with other destination MAC addresses are all discarded and not forwarded. The change eliminates the possibility of broadcast storms in the ring network.

In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 shows a schematic structural diagram of an application environment of an embodiment of the present invention.

FIG. 2 shows a flowchart of a plug-and-play networking method provided by an embodiment of the present invention for eliminating broadcast storms in a video surveillance system ring network.

Figure 3 shows a schematic diagram of the network structure of the video surveillance system ring network.

FIG. 4 shows a schematic diagram of the network structure of a video surveillance system ring network with a link failure.

FIG. 5 is a schematic diagram showing the trend of service data traffic in the ring network after the fault of the ring network link of the video surveillance system is self-healing and repaired.

FIG. 6 shows a schematic diagram of the network structure in which the node network transmission device with the largest bridge MAC address in the video surveillance system ring network fails.

FIG. 7 shows a flowchart of a plug-and-play networking method provided by an embodiment of the present invention for eliminating the failure of the node network transmission device with the largest bridge MAC address in the video surveillance system ring network.

FIG. 8 shows a schematic structural diagram of a plug-and-play networking device provided by an embodiment of the present invention.

FIG. 9 shows a schematic structural diagram of the sender bridge MAC address comparison and adjustment unit.

FIG. 10 shows a schematic structural diagram of the sender bridge MAC address adjustment unit.

FIG. 11 shows a schematic structural diagram of a plug-and-play networking system provided by an embodiment of the present invention.

Among them, the corresponding relationship between reference signs and component names is as follows:

Node network transmission device 100, microprocessor 1001, memory 1002, main port 1003, secondary port 1004, first node network transmission device 110, second node network transmission device 120, third node network transmission device 130, fourth node network Transmission equipment 140, fifth node network transmission equipment 150, terminal equipment 200, network camera 210, monitoring client 220, video wall 230, plug and play networking device 300, all secondary port blocking unit 310, test message initiation unit 320, sender bridge MAC address comparison adjustment unit 330, sender bridge MAC address extraction unit 331, bridge MAC address comparison unit 332, sender bridge MAC address adjustment unit 333, sender bridge MAC address retention unit 3331, sender bridge The MAC address modification unit 3332, the node network transmission device selection unit 340 with the largest bridge MAC address, the node network transmission device setting unit 350 with the largest bridge MAC address, the first fault repair unit 360, and the second fault repair unit 370.

Detailed ways

At present, in the field of ring network technology, private protocols developed based on Ethernet fault detection and switching protection protocols are mainly used to eliminate broadcast storms in the ring network. Switchover protection means that when the working link fails, the network transmission device on the previous node switches the data flow to the protection link, or when the active device fails, the working device is switched from the active device to the standby device.

At present, the private protocols used to eliminate broadcast storms in the ring network mainly include Ericsson's ERP, ERP is the English abbreviation of EthernetRingProtectionSwitching, Huawei and H3C's RRPP, RRPP is the English abbreviation of RapidRingProtechionProtocol, ZTE Technology's ZESR, and ZESR is the English abbreviation of ZTEEthernetSmartRing Abbreviation. Among them, RRPP is a link layer protocol specially applied to the Ethernet ring. When a broadcast storm occurs on the Ethernet ring, the working link is disconnected and the data flow is switched to the protection link to restore each node on the Ethernet ring. A communication link between network transmission devices, thereby eliminating broadcast storms.

In the process of realizing the present invention, the inventor found that adopting RRPP to eliminate broadcast storms in the ring network for ring network networking has high technical implementation difficulty, complex network configuration, heavy network maintenance workload, and high ring network networking costs. It can be suitable for the backbone ring network with higher budget. For ring network networking with low networking budget and cost-sensitive, such as security system ring network network, industrial monitoring and control system ring network network, water and electricity supply communication system ring network network, Internet bar system ring network network, based on The ring network network of the cable TV system of the set-top box is not implemented by using RRPP to eliminate the broadcast storm in the ring network.

In the process of implementing the present invention, the inventor finds that it is not necessary to adopt a private protocol developed based on the switching protection protocol to effectively eliminate the broadcast storm. Theoretically speaking, if the logical topology of the ring network is changed when the ring network is formed, the broadcast storm in the ring network can also be eliminated.

Based on the above knowledge, the inventor provides a plug-and-play networking method, device and system. In the method, device and system, a node network transmission device is elected in the ring network as the message forwarding node network transmission device, which only receives the broadcast message sent by the sender node network transmission device, and forwards the message according to the message broadcast address .

The method can be applied in the application environment shown in FIG. 1 . As shown in FIG. 1 , the application environment is a ring network composed of multiple node network transmission devices 100 connected sequentially according to a ring topology, and the ring network also includes terminal devices 200 networked with the node network transmission devices 100 .

In the embodiment of the present invention, the ring network may be a wireless ring network formed by wireless connections, a wired ring network formed by at least one wired connection among coaxial cables, twisted pairs, and optical fibers, or a wireless ring network. Connections and wired connections work together to form a ring network.

In this embodiment of the present invention, the node network transmission device 100 may be at least one of a router and a network switch, and the node network transmission device 100 has a primary port and a secondary port.

In this embodiment of the present invention, the terminal device 200 is a device having a network communication function. The terminal device 200 may be at least one of a server, an industrial computer, a workstation, a client, a network input device, and a network output device. in,

The server can be one of a file server, a management server, a database server, an application server, and a WEB server.

Industrial computer is a computer used for industrial process control.

A workstation is a computer with stronger information, graphics, image, and video processing capabilities than a personal computer.

The client can be a disk client or a diskless client;

The network input device can be a data acquisition device with network functions, such as a network camera, a network sensor, a network recording device, a network scanner, and a network telephone; it can also be a data acquisition system including a host computer and a data acquisition device.

The network output device may be a network display device, a network hard disk video recorder, or a network print output device, such as a network printer.

In the following, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. .

first embodiment

In the first embodiment, the plug-and-play networking method of the present invention is described by taking the mechanism to eliminate the possibility of broadcast storms generated by the ring network during the ring network networking of the security monitoring system as an example.

Security surveillance system network includes video surveillance system network and access control system network. The node network transmission equipment of the security monitoring system network includes the node network transmission equipment set in the management center and the node network transmission equipment set in the security section. The node network transmission equipment set in the management center is connected to a monitoring client and a video display device. , The node network transmission equipment set in the security section is connected with network input equipment, such as network cameras and access control equipment. For the security monitoring system, the management center is also provided with video data processing devices, such as network hard disk recorders and video servers. Correspondingly, the node network transmission equipment set in the management center is connected to the video data processing device network, and the video data processing device is connected to the monitoring device. The client and the video display device are respectively connected to the network. The above-mentioned network camera, the English full name IPCamera, the English abbreviation I PC, is a camera with network communication function used for video surveillance.

Compared with the access control system network, the business data flow of the security monitoring system network is larger, and the stability and reliability of the network are required to be higher. Therefore, in the first embodiment of the present invention, the video monitoring system ring network network is used. The plug-and-play networking method is described, but it should be noted that the plug-and-play networking method provided by the first embodiment of the present invention is also applicable to the ring network networking of the access control system.

FIG. 2 shows a flowchart of a plug-and-play networking method provided by an embodiment of the present invention for eliminating broadcast storms in a video surveillance system ring network. Please refer to Fig. 2. This method is applied to a node network transmission device for constructing a ring network. When the node network transmission device is used as the current node network transmission device through which the message passes, its secondary port is used to monitor and receive the ring network. The main port of the message sent by the network transmission device of the previous node in the ring network is used to send the message to the network transmission device of the next node in the ring network; the method includes:

S110, use a node network transmission device in the ring network as the initiator of the test packet to send a test packet to the ring network; wherein, the destination MAC address in the test packet is the multicast address of the test packet, and the sender in the test packet Bridge MAC address is the bridge MAC address of the originator of the test packet;

In the first embodiment of the present invention, any node network transmission device in the ring network can be used as the test message initiator, and the embodiment of the present invention does not limit which node network transmission device is selected as the test message initiator. The node network transmission device, as the initiator of the test message, sends a test message to the ring network, which can be done automatically at a preset time point, for example, when the node network transmission device is powered on, or it can be done during the maintenance period of the ring network. . This embodiment of the present invention does not limit the time point at which the test message initiator sends the test message to the ring network.

In the first embodiment of the present invention, the test message is a protocol message, and the message type may be a general type or a self-defined type. The source MAC address in the test packet is the bridge MAC address of the initiator of the test packet, and the destination MAC address in the test packet is the multicast address of the test packet, such as 0180-C200-1234, the sender bridge in the test packet The MAC address is the bridge MAC address of the initiator of the test message; in the security field, after the security section and the monitoring service of the security section are determined, the topology structure of the security monitoring system ring network, service flow data transmission path and transmission method are also determined. , the corresponding packet multicast address is also determined. Therefore, the test packet multicast address usually adopts the packet multicast address in practical applications. Of course, the test packet multicast address may not use the packet multicast address in practical applications. address.

In the first embodiment of the present invention, the initiator of the test packet sends the test packet to the ring network through its main port, which means that the initiator of the test packet sends the test packet through its main port to the next device located behind it in the physical topology of the ring network. The node network transmission equipment sends the test message. The secondary port of the test packet initiator is used to monitor and receive test packets forwarded cyclically.

S120, after the current node network transmission device monitors the test packet sent by the previous node network transmission device, extracts the sender bridge MAC address in the test packet, and compares it with the bridge MAC address of the current node network transmission device, Use the bridge MAC address with the larger one as the sender bridge MAC address in the test packet sent by the network transmission device of the current node to the network transmission device of the next node;

In the first embodiment of the present invention, the test packet sent by the test packet initiator to the ring network is forwarded by the node network transmission equipment in the order of the node network transmission equipment in the physical topology structure on the ring network. The passing current node network transmission device, after monitoring the test message sent by the previous node network transmission device, extracts the sender bridge MAC address in the test message, and compares it with the bridge MAC address of the current node network transmission device , the bridge MAC address with the larger bridge MAC address is used as the sender bridge MAC address in the test packet sent by the network transmission device of the current node to the network transmission device of the next node.

Wherein, the step of using the larger bridge MAC address as the sender bridge MAC address in the test message sent by the current node network transmission device to the next node network transmission device includes:

When the sender's bridge MAC address in the test packet sent by the network transmission device of the previous node is greater than the bridge MAC address of the network transmission device of the current node, the test packet sent by the network transmission device of the current node to the network transmission device of the next node is included in the test packet. The sender bridge MAC address remains unchanged;

When the sender's bridge MAC address in the test packet sent by the network transmission device of the previous node is smaller than the bridge MAC address of the network transmission device of the current node, the test packet sent by the network transmission device of the current node to the network transmission device of the next node is included in the test packet. The sender bridge MAC address is modified to the bridge MAC address of the network transmission device of the current node.

After the test packet is cyclically forwarded on the ring network, the test packet can be monitored and received by the test packet initiator or the secondary port of the network switching device of the node behind the test packet initiator.

In the first embodiment of the present invention, each time the test packet passes through a node network transmission device, the sender bridge MAC address in the test packet is monitored, and the bridge MAC address of the node network transmission device is compared, and the test packet is compared with the bridge MAC address of the node network transmission device. The sender's bridge MAC address in the text is replaced with the one with the larger bridge MAC address. Therefore, the process of cyclically forwarding test packets on the ring network is also the process of finding the test bridge with the largest MAC address.

S130: Find out the node network transmission device with the largest bridge MAC address in the ring network based on the test message after cyclic forwarding for one circle;

In the first embodiment of the present invention, the test packet after cyclic forwarding can be obtained from the initiator of the test packet, or from the node network switching device behind the initiator of the test packet. This embodiment of the present invention There is no restriction on which node network switching device obtains the test packet after cyclic forwarding for one circle.

In the first embodiment of the present invention, the sender bridge MAC address in the test packet after cyclic forwarding is the one with the largest bridge MAC address on the ring network, and the node network transmission device corresponding to the bridge with the largest MAC address is the ring network bridge The node network transmission device with the largest MAC address.

In the first embodiment of the present invention, the determination from the test message initiator sending the test message to the ring network to the node network transmission device with the largest bridge MAC address is completed within 1 millisecond to 20 milliseconds, which is much faster than the 50 milliseconds of the switching protection. millisecond.

S140, block the secondary port of the node network transmission device with the largest bridge MAC address so that it can only receive the message whose destination MAC address is the multicast address of the test message.

In the first embodiment of the present invention, the secondary port of the node network transmission device with the largest bridge MAC address is blocked so that it can only receive the packets whose destination MAC address is the multicast address of the test packet, and the packets with other destination MAC addresses are all blocked. Discard and do not forward, that is, eliminate the possibility of broadcast storms in the ring network by changing the logical topology of the ring network.

In the first embodiment of the present invention, usually the multicast address of the test packet is the multicast address of the packet in the actual application. If the multicast address of the test packet is not the multicast address of the packet in the actual application, then in step S140 The multicast address of the test packet is changed to the multicast address of the actual application.

In the first embodiment of the present invention, the node network transmission device with the largest MAC address can be used as a node network transmission device for forwarding broadcast messages, or it can be used as a node network transmission device for multicast message forwarding. Eliminate the possibility of broadcast storms in the ring network.

In order to improve the test packet forwarding efficiency and obtain the network topology of the ring network in a shorter time, a further solution is:

Before step S110, block the secondary ports of the network transmission devices of multiple nodes in the ring network so that they can only receive the messages whose destination MAC address is the multicast address of the test message; accordingly,

The steps to block the secondary port of the network transmission device of the node with the largest bridge MAC address so that it can only receive the packets whose destination MAC address is the multicast address of the test packet are as follows:

Maintain and block the secondary port of the node network transmission device with the maximum bridge MAC address so that it can only receive the message whose destination MAC address is the multicast address of the test message, and set the maximum bridge MAC address in the ring network. The secondary port of the node network transmission device outside the node network transmission device is released.

Since the secondary ports of the network transmission devices of multiple nodes in the ring network are blocked, the blocked secondary ports can only receive packets whose destination MAC address is the multicast address of the test packet. Therefore, the number of packets forwarded in the ring network is greatly increased. The network transmission equipment of each current node only monitors and processes test packets, which greatly shortens the time for obtaining the ring network topology and improves the networking efficiency of the ring network.

In the plug-and-play networking method provided by the first embodiment of the present invention, in the cyclic forwarding process of the test message, each time the test message passes through a current node network transmission device, based on the sender bridge MAC in the monitored test message The address is compared with the bridge MAC address of the network transmission device of the current node, and the bridge MAC address of the sender in the test packet forwarded by the network transmission device of the current node is changed to the one with the larger bridge MAC address, so that the test packet after a circle is forwarded cyclically. The sender's bridge MAC address in the text is the bridge MAC address of the node network transmission device with the largest bridge MAC address on the ring network, and the bridge MAC address is used to find the node network transmission device with the largest bridge MAC address on the upper ring network. The secondary port of the node network transmission device is blocked so that it can only receive the packets whose destination MAC address is the multicast address of the test packet, and the packets with other destination MAC addresses are all discarded and not forwarded. Eliminate the possibility of broadcast storms in the ring network.

Based on the same or similar network structure and business data, the plug-and-play networking method provided by the first embodiment of the present invention is not limited to the ring network networking of security systems, but is also applicable to industrial monitoring and control systems, water and electricity supply communication systems , Internet bar system ring network network, but also suitable for set-top box-based cable TV system ring network network, such as video-on-demand system ring network network.

Second Embodiment

In the second embodiment, the plug-and-play networking method of the present invention is described by taking a link failure during the operation of the security monitoring system ring network as an example.

Like the first embodiment of the present invention, the ring network of the security monitoring system according to the second embodiment of the present invention is a ring network composed of multiple node network transmission devices connected in sequence, and the main ports of the multiple node network transmission devices are used for The ring network sends packets, and the secondary port is used to monitor and receive packets in the ring network. It should be noted that, in the ring network of the security monitoring system according to the second embodiment of the present invention, when the ring network is formed, the secondary port of the node network transmission device with the largest bridge MAC address is blocked so that it can only receive the destination MAC address as the test report. The message of the multicast address is eliminated from the mechanism of the possibility of broadcast storms in the ring network of the security monitoring system.

A link failure occurs during the operation of the security monitoring system ring network, which means that when the security monitoring system ring network is put into use, the communication link between the network transmission devices of the two nodes in the ring network is interrupted.

In order to facilitate a clear understanding of the technical problem of link failure during ring network operation, and to clearly describe the technical solution of the second embodiment of the present invention, as in the first embodiment of the present invention, in the second embodiment of the present invention, the same The plug-and-play networking method of the present invention is described by taking the ring network of the video surveillance system as an example.

Meanwhile, in order to reduce the difficulty of understanding the technical solution of the second embodiment of the present invention, in the second embodiment of the present invention, it is assumed that the number of management centers is one and the number of monitoring sections is four. However, it should be noted that the second embodiment of the present invention is not limited to the case where the number of management centers is one and the number of monitoring sections is four, and the second embodiment of the present invention does not limit the number of management centers and monitoring sections .

Figure 3 shows a schematic diagram of the network structure of the video surveillance system ring network. Referring to FIG. 3, a node network transmission device is set in the management center, which is defined as the first node network transmission device 110, and a node network transmission device is set in each of the four monitoring sections, which are respectively defined as the second node network. The transmission device 120 , the third node network transmission device 130 , the fourth node network transmission device 140 , and the fifth node network transmission device 150 . The first node network transmission device 110 , the second node network transmission device 120 , the third node network transmission device 130 , the fourth node network transmission device 140 , and the fifth node network transmission device 150 are connected to a physical ring in sequence according to a ring topology. network.

The network transmission device 120 of the second node, the network transmission device 130 of the third node, the network transmission device 140 of the fourth node, and the network transmission device 150 of the fifth node are respectively connected with a network camera 210, and the network camera 210 is used to collect the network camera 210 in real time. The live video image of the monitoring section, the live video image data stream recorded by the network camera 210 is transmitted to the corresponding node network transmission device, and the corresponding node network transmission device is transmitted to the first node network transmission device 110 through the logistics ring network.

A monitoring client 220 and a video wall 230 are connected to the network transmission device 110 of the first node, and the live video images recorded by the multi-channel network cameras are displayed in real time through the monitoring client 220 or the video wall 230 .

FIG. 4 shows a schematic diagram of the network structure of a video surveillance system ring network with a link failure. Please refer to FIG. 4 , when the video surveillance system ring network is networked, the logical topology of the video surveillance system ring network has been changed according to the second node network transmission device 120 being the node network transmission device with the largest MAC address, That is, the secondary port of the network transmission device 120 of the second node of the bridge is blocked so that it can only receive the message whose destination MAC address is the multicast address of the test message. When the video surveillance system ring network is put into use, the test message multicast address is also the message multicast address.

After the ring network of the video surveillance system is put into operation for a period of time, the network communication link between the network transmission device 140 of the fourth node and the network transmission device 150 of the fifth node is interrupted. The message whose destination MAC address is the message multicast address cannot reach the secondary port of the second node network transmission device 120, that is, the integrity of the video surveillance system ring network has problems.

Aiming at the situation that a link failure occurs in the ring network of the video surveillance system, the second embodiment of the present invention provides a plug-and-play networking method on the basis of the first embodiment of the present invention. When a link failure occurs in the ring network, the method further includes the steps on the basis of the first embodiment of the present invention:

Release the secondary port of the network transmission device of the node with the largest bridge MAC address that is blocked so that it can receive packets with destination MAC addresses other than the test packet multicast address in the ring network.

FIG. 5 is a schematic diagram showing the trend of service data traffic in the ring network after the fault of the ring network link of the video surveillance system is self-healing and repaired. Referring to FIG. 5 , after the blocked secondary port of the network transmission device 120 of the second node is released, the video stream service data packet sent by the network transmission device 140 of the fourth node at the end of the link failure passes through the network of the third node in sequence. The transmission device 130 and the second node network transmission device 120 forward to the first node network transmission device 110, and the first node network transmission device 110 then forwards the video stream service data packet to the monitoring client 220 and the TV display wall, and the monitoring client 220 and the TV display wall display surveillance video images in real time.

The video stream service data packet sent by the fifth node network transmission device 150 at the other end of the link failure is forwarded to the first node network transmission device 110, and the first node network transmission device 110 then forwards the video stream service data packet to the monitoring client The terminal 220 and the TV display wall, the monitoring client 220 and the TV display wall display the monitoring video images in real time.

Similarly, the video stream service data of the network camera 210 received by the network transmission device 130 of the third node and the network transmission device 120 of the second node can also be forwarded to the network transmission device 110 of the first node in the form of packets, and the monitoring client 220 The monitoring video images recorded by the network cameras 210 corresponding to the network transmission device 130 of the third node and the network transmission device 120 of the second node are displayed in real time on the TV display wall.

In the plug-and-play networking method provided by the second embodiment of the present invention, when a link failure occurs in the video surveillance system ring network, the secondary port of the node network transmission device with the largest bridge MAC address that is blocked is released so that it can receive The destination MAC address in the ring network is other than the multicast address of the test packet, so that without physically repairing the link, by modifying the logical topology of the ring network, the link failure of the video surveillance system ring network can be realized. Self-healing repair.

Based on the same or similar network structure and business data, the plug-and-play networking method provided by the second embodiment of the present invention is not limited to the ring network networking of security systems, but is also applicable to industrial monitoring and control systems, water and electricity supply communication systems , Internet bar system ring network network, but also suitable for set-top box-based cable TV system ring network network, such as video-on-demand system ring network network.

Third Embodiment

In the third embodiment, the plug-and-play networking method of the present invention is described by taking the failure of the node network transmission equipment during the operation of the security monitoring system ring network as an example.

Like the first embodiment of the present invention and the second embodiment of the present invention, the ring network of the security monitoring system according to the third embodiment of the present invention is a ring network composed of multiple node network transmission devices connected in sequence, and the multiple node network transmission The primary port of the device is used to send packets to the ring network, and the secondary port is used to monitor and receive packets in the ring network. It should be noted that, in the ring network of the security monitoring system according to the third embodiment of the present invention, when the ring network is formed, the secondary port of the node network transmission device with the largest bridge MAC address is blocked so that it can only receive the destination MAC address as the test report. The message of the multicast address is eliminated from the mechanism of the possibility of broadcast storms in the ring network of the security monitoring system.

The failure of the node network transmission equipment during the operation of the security monitoring system ring network means that when the security monitoring system ring network is put into use, the node network transmission equipment in the ring network fails, and the message monitoring reception and/or message forwarding cannot be realized. The failure of the node network transmission equipment includes the failure of the node network transmission device with the largest bridge MAC address in the ring network and the failure of the node network transmission device with the non-maximum bridge MAC address.

In order to facilitate a clear understanding of the technical problem of the failure of the node network transmission equipment during the operation of the ring network, and to clearly describe the technical solution of the third embodiment of the present invention, the same as the first embodiment of the present invention and the second embodiment of the present invention, in the present invention In the third embodiment of the present invention, the plug-and-play networking method of the present invention is also described by taking a video surveillance system ring network as an example.

At the same time, in order to reduce the difficulty of understanding the technical solution of the third embodiment of the present invention, the video surveillance system ring network of the third embodiment of the present invention has the same network structure as the video surveillance system ring network of the second embodiment of the present invention.

If the failure of the node network transmission equipment is the failure of the node network transmission equipment whose bridge MAC address is not the largest, the effect brought about by the failure of the node network transmission equipment is a link with the ring network video monitoring system in the second embodiment of the present invention. The effect of the failure is the same. Correspondingly, for the failure of the network transmission device of the node whose MAC address is not the largest, the ready-to-use self-healing networking method provided by the third embodiment of the present invention is the same as the ready-to-use self-healing group provided by the second embodiment of the present invention. The networking methods are the same. For the convenience and simplicity of description, the specific implementation process may refer to the specific description of the ready-to-use self-healing networking method provided by the second embodiment of the present invention, which will not be repeated here.

FIG. 6 shows a schematic diagram of the network structure in which the node network transmission device with the largest bridge MAC address in the video surveillance system ring network fails. Referring to Figure 6, when the network transmission device of the node with the largest bridge MAC address in the ring network fails, that is, the network transmission device of the second node fails, then the secondary port of the network transmission device of the first node can neither monitor nor The packet whose destination MAC is the packet multicast address sent by the primary port of the network transmission device of the second node cannot be received.

FIG. 7 shows a flowchart of a plug-and-play networking method provided by an embodiment of the present invention for eliminating the failure of the node network transmission device with the largest bridge MAC address in the video surveillance system ring network. Referring to FIG. 7 , the method further includes the following steps on the basis of the first embodiment of the present invention:

S310, use the node network transmission device whose secondary port in the ring network is connected to the node network transmission device with the largest MAC address of the bridge as the test message initiator to send a test message to the ring network; wherein, the destination MAC address in the test message Indicates the multicast address of the test packet, and the sender bridge MAC address in the test packet is the bridge MAC address of the initiator of the test packet;

For a specific implementation process, please refer to step S110 in the first embodiment of the present invention. Different from step S110 in the first embodiment of the present invention, in step S310, the initiator of the test packet is a node network transmission device in the ring network whose secondary port is connected to the node network transmission device with the largest bridge MAC address.

S320, after the current node network transmission device monitors the test packet sent by the previous node network transmission device, extracts the sender's bridge MAC address in the test packet, compares it with its own bridge MAC address, and compares the bridge MAC address with the bridge MAC address. The larger one is the sender bridge MAC address in the test packet sent by the network transmission device of the current node to the network transmission device of the next node;

For a specific implementation process, please refer to step S120 in the first embodiment of the present invention.

S330: Find the node network transmission device with the second largest bridge MAC address in the ring network based on the node network transmission device whose main port is connected to the node network transmission device with the largest bridge MAC address network listening or receiving the test message.

For a specific implementation process, please refer to step S130 in the first embodiment of the present invention. In step S330, although it is the node network transmission device with the second largest bridge MAC address in the ring network, it is also the node network transmission device with the largest bridge MAC address in the ring network that can operate normally. Different from step S110 in the first embodiment of the present invention, in step S330, the test message used to find the node network transmission device with the second largest bridge MAC address in the ring network is, based on the main port and the bridge MAC address having the largest The node network transmission device connected to the node network transmission device of the node network transmission device monitors or receives the test message.

The plug-and-play networking method provided by the third embodiment of the present invention adopts the same method as the second embodiment of the present invention when the node network transmission device whose bridge MAC address is not the largest fails, and does not physically repair the link In this case, through the modification of the logical topology of the ring network, the self-healing repair of the network transmission equipment of the node with the non-maximum MAC address of the ring network bridge of the video surveillance system is realized; when the network transmission equipment of the node with the maximum bridge MAC address fails, the The node network transmission device in the normal operation of the ring network finds the node network transmission device with the largest bridge MAC address, that is, the node network transmission device with the second largest bridge MAC address in the ring network. In the case of physical repair, through the change of the logical topology of the ring network, the self-healing repair of the network transmission equipment failure of the node with the largest bridge MAC address in the video surveillance system ring network is realized.

Based on the same or similar network structure and business data, the plug-and-play networking method provided by the third embodiment of the present invention is not limited to the ring network networking of security systems, but is also applicable to industrial monitoring and control systems, water and electricity supply communication systems , Internet bar system ring network network, but also suitable for set-top box-based cable TV system ring network network, such as video-on-demand system ring network network.

It should be noted that, whether in the second embodiment of the present invention or the third embodiment of the present invention, whether it is a link failure or a node network transmission equipment failure, the plug-and-play networking method provided by the embodiment of the present invention In the repaired ring network, the secondary port of the network transmission device of the node with the largest bridge MAC address in normal operation cannot receive the message whose destination MAC address is the multicast address of the message sent by its primary port, so its secondary port is not blocked. Nor will it cause broadcast storms.

It should also be noted that the convergence time of service data traffic after the link failure in the second embodiment of the present invention and the failure of the node network transmission device in the third embodiment of the present invention depends on whether the destination MAC sent by the node network transmission device is the message The packet interval of the multicast address. The packet interval can be set according to the performance of the actual node network transmission equipment. For example, set the packet interval to 10 milliseconds, 50 milliseconds, or 1 second.

Fourth Embodiment

The fourth embodiment provides a plug-and-play networking device. The device can be applied to the application environments of the first embodiment, the second embodiment, and the third embodiment of the present invention.

FIG. 8 shows a schematic structural diagram of a plug-and-play networking device 300 provided by an embodiment of the present invention. Please refer to FIG. 8 , the plug-and-play networking device 300 is applied to a node network transmission device for constructing a ring network. When the node network transmission device is used as the current node network transmission device through which a message passes, its secondary port It is used to monitor and receive the message sent by the network transmission device of the previous node in the ring network, and its main port is used to send the message to the network transmission device of the next node in the ring network;

The plug-and-play networking device 300 is installed in the memory 1002 and includes one or more software function modules executed by the microprocessor 1001; the plug-and-play networking device 300 includes a test message initiating unit 320, a sender bridge The MAC address comparison and adjustment unit 330 , the node network transmission device selection unit 340 with the largest bridge MAC address, and the node network transmission device setting unit 350 with the largest bridge MAC address. in,

The test message initiating unit 320 is configured to use a node network transmission device in the ring network as a test message initiator to send a test message to the ring network; wherein, the destination MAC address in the test message is the test message multicast address, The sender bridge MAC address in the test packet is the bridge MAC address of the initiator of the test packet;

The sender bridge MAC address comparison and adjustment unit 330, as shown in FIG. 9, the sender bridge MAC address comparison and adjustment unit 330 includes a sender bridge MAC address extraction unit 331, a bridge MAC address comparison unit 332, and a sender bridge MAC address modification unit 330 unit3332;

The sender bridge MAC address extraction unit 331 is used to extract the sender bridge MAC address in the test message after the current node network transmission device monitors the test message sent by the previous node network transmission device;

The bridge MAC address comparison unit 332 is configured to compare the sender bridge MAC address in the test message with the bridge MAC address of the current node network transmission device;

The sender bridge MAC address adjustment unit 333 is used to use the bridge MAC address with the larger bridge MAC address as the sender bridge MAC address in the test message sent by the current node network transmission device to the next node network transmission device;

Wherein, as shown in FIG. 10 , the sender bridge MAC address adjustment unit 333 includes:

The sender bridge MAC address retention unit 3331 is used to store the current node network transmission device backward when the sender bridge MAC address in the test packet sent by the network transmission device of the current node is greater than the bridge MAC address of the network transmission device of the current node. The MAC address of the sender bridge in the test packet sent by the network transmission device of a node remains unchanged;

The sender bridge MAC address modification unit 3332, when the sender bridge MAC address in the test packet sent by the network transmission device of the previous node is smaller than the bridge MAC address of the network transmission device of the current node, is used to reverse the network transmission device of the current node. The sender's bridge MAC address in the test packet sent by the network transmission device of a node is modified to the bridge MAC address of the network transmission device of the current node.

The node network transmission device selection unit 340 with the largest bridge MAC address finds out the node network transmission device with the largest bridge MAC address in the ring network based on the test message after cyclic forwarding one circle;

The node network transmission device setting unit 350 with the largest bridge MAC address is configured to block the secondary port of the node network transmission device with the largest bridge MAC address so that it can only receive packets whose destination MAC address is the test packet multicast address.

In order to improve the efficiency of cyclic forwarding of test packets and obtain the network topology of the ring network in a shorter time, a further solution is that the plug-and-play networking device 300 further includes all secondary port blocking units 310;

The all secondary port blocking unit 310 is used to block the secondary ports of the network transmission devices of multiple nodes in the ring network to make it before sending a test packet to the ring network with a network transmission device of a node in the ring network as the initiator of the test packet. Only the packets whose destination MAC address is the multicast address of the test packet can be received;

The node network transmission device setting unit 350 with the largest bridge MAC address, after finding the node network transmission device with the largest bridge MAC address in the ring network based on the test message after cyclically forwarding one circle, is used to maintain the blockage of the bridge with the largest MAC address. The secondary port of the node network transmission device enables it to only receive the message whose destination MAC address is the test packet multicast address, and transmits the node with the largest bridge MAC address in the ring network to the node outside the network transmission device. The secondary port of the network transmission device is released.

In order to self-heal and repair a link failure or a node network transmission device with a non-maximum bridge MAC address in the ring network, a further solution is that the plug-and-play networking device 300 further includes a first failure repair unit 360. When there is a link failure or the network transmission device of the node with the bridge MAC address that is not the largest in the ring network fails, it is used to release the secondary port of the network transmission device of the node with the largest bridge MAC address that is blocked so that it can receive the network transmission device in the ring network. Test packets with destination MAC addresses other than the multicast address.

In order to self-heal and repair the failure of the node network transmission equipment with the largest bridge MAC address, a further solution is that the plug-and-play networking device 300 further includes:

The second fault repair unit 370, the second fault repair unit 370 includes a test packet initiating unit 320, a sender bridge MAC address adjustment unit 333, and a node network transmission device selection unit with the second largest bridge MAC address; wherein,

The test message initiating unit 320, when the node network transmission device with the largest bridge MAC address in the ring network fails, is also used for the node network transmission network connected with the secondary port in the ring network and the node network transmission device network with the largest bridge MAC address. As the initiator of the test packet, the device sends a test packet to the ring network; the destination MAC address in the test packet is the multicast address of the test packet, and the MAC address of the sender bridge in the test packet is the address of the initiator of the test packet. bridge MAC address;

The sender bridge MAC address adjustment unit 333 includes a sender bridge MAC address extraction unit 331, a bridge MAC address comparison unit 332, and a sender bridge MAC address modification unit 3332;

The sender bridge MAC address extraction unit 331 is used to extract the sender bridge MAC address in the test message after the current node network transmission device monitors the test message sent by the previous node network transmission device;

The bridge MAC address comparison unit 332 is configured to compare the sender bridge MAC address in the test message with the bridge MAC address of the current node network transmission device;

The sender bridge MAC address adjustment unit 333 is used to use the bridge MAC address with the larger bridge MAC address as the sender bridge MAC address in the test message sent by the current node network transmission device to the next node network transmission device;

The selection unit of the node network transmission device with the second largest bridge MAC address. When the node network transmission device with the largest bridge MAC address in the ring network fails, it is used for network connection with the node network transmission device with the largest bridge MAC address based on the main port. The node network transmission device that monitors or receives the test message finds out the node network transmission device with the second largest bridge MAC address in the ring network.

For the implementation process and effects obtained in the fourth embodiment of the present invention, reference may be made to the first embodiment of the present invention, the second embodiment of the present invention, and the third embodiment of the present invention.

The unit modules in the fourth embodiment of the present invention may be implemented by software codes. In this case, the above-mentioned modules are installed in the memory 1002 . The above units can also be implemented by hardware such as integrated circuit chips. Those skilled in the art can clearly understand that, for the convenience and brevity of description, for the specific description of the functional modules described above, reference may be made to the specific description of the corresponding method steps, which will not be repeated here.

Fifth Embodiment

The fifth embodiment provides a plug-and-play networking system. This system is applicable to the application environment of the first embodiment.

FIG. 11 shows a schematic structural diagram of a plug-and-play networking system provided by an embodiment of the present invention. Referring to FIG. 11, the system includes a node network transmission device 100, the node network transmission device 100 includes a microprocessor 1001, a memory 1002, and the microprocessor 1001 is connected to the memory 1002 by bus; a plurality of node network transmission devices 100 are arranged in a ring topology In a ring network formed by sequential network connections, when the node network transmission device 100 is used as the current node network transmission device 100 through which the message passes, its secondary port 1004 is used to monitor and receive messages sent by the previous node network transmission device 100 in the ring network. message, whose main port 1003 is used to send the message to the network transmission device 100 of the next node in the ring network;

The system also includes a plug-and-play networking device 300, which is installed in the memory 1002 and includes one or more software function modules executed by the microprocessor 1001;

The plug-and-play networking device 300 includes:

The test message initiating unit 320 is configured to use a node network transmission device 100 in the ring network as a test message initiator to send a test message to the ring network; wherein, the destination MAC address in the test message is the test message multicast address , the sender bridge MAC address in the test packet is the bridge MAC address of the initiator of the test packet;

The sender bridge MAC address comparison and adjustment unit 330, the sender bridge MAC address comparison adjustment unit 330 includes a sender bridge MAC address extraction unit, a bridge MAC address comparison unit, and a sender bridge MAC address modification unit;

The sender bridge MAC address extraction unit is used to extract the sender bridge MAC address in the test message after the current node network transmission device 100 monitors the test message sent by the previous node network transmission device 100;

a bridge MAC address comparison unit, configured to compare the sender bridge MAC address in the test message with the bridge MAC address of the current node network transmission device 100;

a sender bridge MAC address adjustment unit, configured to use the larger bridge MAC address as the sender bridge MAC address in the test packet sent by the network transmission device 100 of the current node to the network transmission device 100 of the next node;

The node network transmission device selection unit 340 with the largest bridge MAC address finds out the node network transmission device 100 with the largest bridge MAC address in the ring network based on the test message after cyclic forwarding for one circle;

The node network transmission device setting unit 350 with the largest bridge MAC address is configured to block the secondary port 1004 of the node network transmission device 100 with the largest bridge MAC address so that it can only receive packets whose destination MAC address is the test packet multicast address.

Referring to the fourth embodiment of the present invention, the fifth embodiment of the present invention adds all secondary port blocking units 310, and adjusts the network transmission device setting unit 350 of the node with the largest bridge MAC address to the test packet after forwarding one circle based on the cycle After finding the node network transmission device 100 with the largest bridge MAC address in the ring network, in the case of releasing the secondary port 1004 of the node network transmission device 100 outside the node network transmission device 100 with the largest bridge MAC address in the ring network, The acquisition time of the ring network topology can be greatly shortened, and the networking efficiency of the ring network can be improved.

Referring to the fourth embodiment of the present invention, the fifth embodiment of the present invention can be applied to the application environment of the second embodiment and the application environment of the third embodiment when the first fault repair unit 360 is added.

Referring to the fourth embodiment of the present invention, the fifth embodiment of the present invention can be applied to the application environment of the third embodiment when the second fault repair unit 370 is added.

For the working process of the plug-and-play networking system according to the fifth embodiment of the present invention, please refer to the corresponding implementation process of the plug-and-play networking device 300 according to the fourth embodiment of the present invention.

To sum up, the plug-and-play networking method, device and system provided by the embodiments of the present invention are the transmission equipment with the largest bridge MAC address found in the ring network, and its secondary port is blocked so that it can only receive the destination MAC address. In order to test packets with multicast addresses, packets with other destination MAC addresses are discarded and not forwarded, thus eliminating the possibility of broadcast storms in the ring network by changing the logical topology of the ring network. By releasing the blocked secondary port, it can realize self-healing repair of link failure and node network transmission equipment failure with non-maximum bridge MAC address by changing the logical topology without physical repair. Find the node network transmission device with the largest bridge MAC address through the node network transmission device in the normal operation of the ring network, that is, the node network transmission device with the second largest bridge MAC address in the ring network. When the equipment is physically repaired, the self-healing repair of the network transmission equipment failure of the node with the largest bridge MAC address in the video surveillance system ring network is realized.

Claims (11)

1. The plug-and-play networking method is applied to node network transmission equipment for constructing a ring network, when the node network transmission equipment is used as current node network transmission equipment through which a message passes, a secondary port of the node network transmission equipment is used for monitoring and receiving the message sent by previous node network transmission equipment in the ring network, and a primary port of the node network transmission equipment is used for sending the message to next node network transmission equipment in the ring network; characterized in that the method comprises:

a node network transmission device in the ring network is used as a test message initiator to send a test message to the ring network; the target MAC address in the test message is a test message multicast address, and the sender bridge MAC address in the test message is a bridge MAC address of the test message initiator;

after monitoring the test message sent by the previous node network transmission equipment, the current node network transmission equipment extracts a sender bridge MAC address in the test message, compares the sender bridge MAC address with the bridge MAC address of the current node network transmission equipment, and takes a bridge MAC address larger than the sender bridge MAC address as the sender bridge MAC address in the test message sent to the next node network transmission equipment by the current node network transmission equipment;

finding out the node network transmission equipment with the maximum bridge MAC address in the ring network based on the test message after circularly forwarding one circle;

and blocking the secondary port of the node network transmission equipment with the maximum bridge MAC address so that the secondary port can only receive the message with the target MAC address as the test message multicast address.

2. The plug-and-play networking method of claim 1, wherein said step of using a bridge MAC address owner as a sender bridge MAC address in a test message sent by said current node network transmission device to said next node network transmission device comprises:

when the sender bridge MAC address in the test message sent by the previous node network transmission equipment is larger than the bridge MAC address of the current node network transmission equipment, keeping the sender bridge MAC address in the test message sent by the current node network transmission equipment to the next node network transmission equipment unchanged;

and when the sender bridge MAC address in the test message sent by the previous node network transmission equipment is smaller than the bridge MAC address of the current node network transmission equipment, modifying the sender bridge MAC address in the test message sent by the current node network transmission equipment to the next node network transmission equipment into the bridge MAC address of the current node network transmission equipment.

3. The plug-and-play networking method according to claim 1 or 2, wherein before the step of sending the test packet to the ring network with a node network transmission device in the ring network as a test packet initiator, the method further comprises:

blocking the auxiliary ports of a plurality of node network transmission devices of the ring network to enable the auxiliary ports to only receive the message of which the destination MAC address is the test message multicast address;

the step of blocking the secondary port of the node network transmission equipment with the maximum bridge MAC address so that the secondary port can only receive the message with the target MAC address as the test message multicast address is as follows:

and maintaining the secondary port of the node network transmission equipment with the maximum bridge MAC address to be blocked so that the secondary port can only receive the message of which the destination MAC address is the test message multicast address, and releasing the secondary port of the node network transmission equipment outside the node network transmission equipment with the maximum bridge MAC address in the ring network.

4. The plug-and-play networking method of claim 1 or 2,

when the ring network has a link failure or the node network transmission equipment with the non-maximum bridge MAC address in the ring network has a failure, the method further comprises the following steps:

and releasing the secondary port of the blocked node network transmission equipment with the maximum bridge MAC address so as to enable the secondary port to receive messages of other destination MAC addresses except the test message multicast address in the ring network.

5. The plug-and-play networking method of claim 1 or 2,

when the node network transmission equipment with the maximum bridge MAC address in the ring network fails, the method further comprises the following steps:

taking the node network transmission equipment in the looped network, of which the secondary port is in network connection with the node network transmission equipment with the maximum bridge MAC address, as a test message initiator to send a test message to the looped network; the target MAC address in the test message is a test message multicast address, and the sender bridge MAC address in the test message is a bridge MAC address of the test message initiator;

after monitoring the test message sent by the previous node network transmission equipment, the current node network transmission equipment extracts a sender bridge MAC address in the test message, compares the sender bridge MAC address with the own bridge MAC address, and takes a bridge MAC address larger than the sender bridge MAC address as the sender bridge MAC address in the test message sent by the current node network transmission equipment to the next node network transmission equipment;

and based on the node network transmission equipment with the main port in network connection with the node network transmission equipment with the maximum bridge MAC address, monitoring or receiving a test message to find out the node network transmission equipment with the second maximum bridge MAC address in the ring network.

6. The network device comprises a plug-and-play networking device, a network management device and a network management system, wherein the plug-and-play networking device is applied to node network transmission equipment for constructing a ring network, when the node network transmission equipment is used as current node network transmission equipment through which a message passes, a secondary port of the network management device is used for monitoring and receiving the message sent by previous node network transmission equipment in the ring network, and a primary port of the network management device is used for sending the message to next node network transmission equipment in the ring network; characterized in that the device comprises:

a test message initiating unit, configured to send a test message to the ring network by using a node network transmission device in the ring network as a test message initiator; the target MAC address in the test message is a test message multicast address, and the sender bridge MAC address in the test message is a bridge MAC address of the test message initiator;

the sender bridge MAC address comparison and adjustment unit comprises a sender bridge MAC address extraction unit, a bridge MAC address comparison unit and a sender bridge MAC address modification unit;

a sender bridge MAC address extracting unit, configured to extract a sender bridge MAC address in the test message after the current node network transmission device monitors the test message sent by the previous node network transmission device;

a bridge MAC address comparison unit, configured to compare a sender bridge MAC address in the test message with a bridge MAC address of the current node network transmission device;

a sender bridge MAC address adjusting unit, configured to use a bridge MAC address larger than the sender bridge MAC address in the test message sent by the current node network transmission device to the next node network transmission device;

the node network transmission equipment with the maximum bridge MAC address is selected by the unit, and the node network transmission equipment with the maximum bridge MAC address in the ring network is found out based on the test message after the cyclic forwarding for one circle;

and the node network transmission equipment setting unit with the maximum bridge MAC address is used for blocking the auxiliary port of the node network transmission equipment with the maximum bridge MAC address so that the auxiliary port can only receive the message with the target MAC address as the test message multicast address.

7. The plug-and-play networking device of claim 6, wherein the sender bridge MAC address adjustment unit comprises:

a sender bridge MAC address holding unit, configured to hold a sender bridge MAC address in a test message sent by the previous node network transmission device to the next node network transmission device unchanged when the sender bridge MAC address in the test message is greater than the bridge MAC address of the current node network transmission device;

a sender bridge MAC address modification unit, configured to modify a sender bridge MAC address in a test message sent by the previous node network transmission device to the next node network transmission device to a bridge MAC address of the current node network transmission device when the sender bridge MAC address in the test message is smaller than the bridge MAC address of the current node network transmission device.

8. The plug-and-play networking device of claim 6 or 7, wherein the device further comprises an all secondary port blocking unit;

the all secondary port blocking unit is used for blocking the secondary ports of a plurality of node network transmission devices of the ring network to enable the secondary ports to only receive the message with the destination MAC address as the test message multicast address before the node network transmission device in the ring network is used as a test message initiator to send the test message to the ring network;

the node network transmission equipment setting unit with the maximum bridge MAC address is used for keeping the secondary port of the node network transmission equipment with the maximum bridge MAC address in a ring network blocked so that the secondary port can only receive the message with the target MAC address as the multicast address of the test message after finding out the node network transmission equipment with the maximum bridge MAC address in the ring network based on the test message circularly forwarded for one turn, and releasing the secondary port of the node network transmission equipment outside the node network transmission equipment with the maximum bridge MAC address in the ring network.

9. The plug-and-play networking device of claim 6 or 7, wherein the device further comprises:

and the first fault repairing unit is used for releasing the secondary port of the blocked node network transmission equipment with the maximum bridge MAC address when the ring network has a link fault or the node network transmission equipment with the non-maximum bridge MAC address in the ring network has a fault, so that the first fault repairing unit can receive messages of other destination MAC addresses except the test message multicast address in the ring network.

10. The plug-and-play networking device of claim 6 or 7, wherein the device further comprises:

the second fault repairing unit comprises a test message initiating unit, a sender bridge MAC address adjusting unit and a node network transmission equipment selecting unit with the second largest bridge MAC address;

the test message initiating unit is used for sending a test message to the ring network by taking the node network transmission equipment in the ring network, of which the secondary port is in network connection with the node network transmission equipment with the maximum bridge MAC address, as a test message initiator when the node network transmission equipment with the maximum bridge MAC address in the ring network fails; the target MAC address in the test message is a test message multicast address, and the sender bridge MAC address in the test message is a bridge MAC address of the test message initiator;

the sender bridge MAC address adjusting unit comprises a sender bridge MAC address extracting unit, a bridge MAC address comparing unit and a sender bridge MAC address modifying unit;

a sender bridge MAC address extracting unit, configured to extract a sender bridge MAC address in the test message after the current node network transmission device monitors the test message sent by the previous node network transmission device;

a bridge MAC address comparison unit, configured to compare a sender bridge MAC address in the test message with a bridge MAC address of the current node network transmission device;

a sender bridge MAC address adjusting unit, configured to use a bridge MAC address larger than the sender bridge MAC address in the test message sent by the current node network transmission device to the next node network transmission device;

and the node network transmission equipment selecting unit with the second largest bridge MAC address is used for monitoring or receiving a test message to find out the node network transmission equipment with the second largest bridge MAC address in the ring network based on the node network transmission equipment with the main port connected with the node network transmission equipment with the largest bridge MAC address when the node network transmission equipment with the largest bridge MAC address in the ring network has a fault.

11. The plug-and-play networking system comprises node network transmission equipment, wherein the node network transmission equipment comprises a microprocessor and a memory, and the microprocessor is connected with the memory through a bus; when the node network transmission equipment is used as the current node network transmission equipment through which the message passes, the secondary port of the node network transmission equipment is used for monitoring and receiving the message sent by the previous node network transmission equipment in the ring network, and the primary port of the node network transmission equipment is used for sending the message to the next node network transmission equipment in the ring network; it is characterized in that the preparation method is characterized in that,

the system further includes a plug-and-play networking device installed in the memory and including one or more software function modules executed by the microprocessor;

the plug-and-play networking device comprises:

a test message initiating unit, configured to send a test message to the ring network by using a node network transmission device in the ring network as a test message initiator; the target MAC address in the test message is a test message multicast address, and the sender bridge MAC address in the test message is a bridge MAC address of the test message initiator;

the sender bridge MAC address comparison and adjustment unit comprises a sender bridge MAC address extraction unit, a bridge MAC address comparison unit and a sender bridge MAC address modification unit;

a sender bridge MAC address extracting unit, configured to extract a sender bridge MAC address in the test message after the current node network transmission device monitors the test message sent by the previous node network transmission device;

a bridge MAC address comparison unit, configured to compare a sender bridge MAC address in the test message with a bridge MAC address of the current node network transmission device;

a sender bridge MAC address adjusting unit, configured to use a bridge MAC address larger than the sender bridge MAC address in the test message sent by the current node network transmission device to the next node network transmission device;

the node network transmission equipment with the maximum bridge MAC address is selected by the unit, and the node network transmission equipment with the maximum bridge MAC address in the ring network is found out based on the test message after the cyclic forwarding for one circle;

and the node network transmission equipment setting unit with the maximum bridge MAC address is used for blocking the auxiliary port of the node network transmission equipment with the maximum bridge MAC address so that the auxiliary port can only receive the message with the target MAC address as the test message multicast address.