WO2018210311A1 - Ethernet bus switch, ethernet bus architecture, and data communication method - Google Patents

Abstract

The present application relates to an Ethernet bus switch. The switch comprises a switching logic unit and a transmission logic assembly. A data reorganization unit of the transmission logic assembly copies a data frame from a device port for a routing decision unit to route the data frame to the directions of a pair of network link ports. The data reorganization unit of the transmission logic assembly copies a data frame which is from one of the pair of network link ports, has a bus attribute, and has a destination MAC address being the MAC address of a bus device on a local device port, for the routing decision unit to route the data frame to the direction of the device port and the direction of the other of the pair of network link ports. Thus, point-to-multipoint communication is achieved by means of unicast. The present application also relates to an Ethernet bus architecture consisting of multiple Ethernet bus switches.

Description

 Ethernet bus switch, Ethernet bus architecture and data communication method

 [0001] The present disclosure relates to an Ethernet bus switch, an Ethernet bus architecture including an Ethernet bus switch, and a data communication method using the same, and in particular, a communication method capable of implementing cross communication and lossless monitoring data. Background technique

 [0002] The traditional bus physically implements half-duplex communication by broadcasting to the device downwards and branching upwards.

 The traditional bus communication mode is characterized by: data delay, small jitter, point-to-multipoint half-duplex communication mode. However, the traditional bus communication mode has almost no data redundancy protection mechanism, and the number of cables is large, the wiring is complicated, the fault tolerance is low, the cost is high, the bandwidth is small, only 9600~12 Mbps, and the rate is low. Moreover, the traditional bus system communication mode cannot achieve full-duplex communication, so the efficiency is relatively low.

 [0003] With the development of Ethernet technology, the traditional Ethernet switching system can adopt point-to-point unicast communication and point-to-multipoint broadcast/multicast one-way communication, and can realize full-duplex communication. Ethernet equipment costs, low cable cost, fast speed (100M, 1000M, 10 Gigabit), and full-duplex communication mechanism, sharing, splicing, high degree of uniformity, and good connectivity. However, due to the transmission characteristics of Ethernet, the determinism, realism, and stability of the network are not as good as bus communication.

 technical problem

 [0004] Therefore, if the advantages of the conventional bus can be combined with the Ethernet technology, it can make the point-to-multipoint determinism, realism, and stability advantages of the traditional bus for data communication in the data transmission process. Get the advantages of traditional Ethernet for high-speed, full-duplex communication.

 Problem solution

 Technical solution

[0005] In order to eliminate the above problems in the existing conventional bus and Ethernet, according to one aspect of the present disclosure, an Ethernet bus switch is proposed, comprising: one or more device ports; a pair of network link ports; a logic unit, transmitting or receiving a data frame, and learning a source device MAC address of the received data frame based on a source MAC address learning mechanism and storing the MAC address in the MAC address table; and transmitting logic components, including a routing decision unit and a data reassembly unit, The data reassembly unit will data from the device port Copying a frame so that the routing decision unit routes the data frame to the pair of network link port directions, and the data reassembly unit will have a bus attribute from one of the pair of network link ports and the destination MAC address is a local device Copying a data frame of the MAC address of the bus device on the port, so that the routing decision unit routes the data frame to the device port direction and the other port direction of the pair of network link ports, thereby implementing the point pair in a unicast manner More communication.

[0006] An Ethernet bus switch according to the present disclosure, wherein the data reassembly unit adds a data frame ID for a data frame transmitted from a device port via a switching logical unit and strips the data frame ID for a data frame received from the routing decision unit.

 [0007] An Ethernet bus switch according to the present disclosure, wherein the data frame ID includes a data frame sequence number generated based on a source switch ID.

 [0008] An Ethernet bus switch according to the present disclosure, wherein the data frame ID includes a active switch ID, a destination switch ID, and a data frame sequence number generated based on the source switch ID.

 [0009] The Ethernet bus switch according to the present disclosure, wherein the data reassembly unit is the same as the source MAC address in the data frame from one of the pair of network link ports and the MAC address of the local bus device The source information and the destination information in the routing protocol field in the frame are exchanged for reorganization.

 [0010] The Ethernet bus switch according to the present disclosure, wherein the routing decision unit routes only data frames from a MAC address of a device on a local device port that is not a destination MAC address from one of the pair of network link ports to The other port direction of the pair of network link ports.

 [0011] An Ethernet bus switch according to the present disclosure, wherein the routing decision unit pairs a MAC from one of the pair of network link ports that does not have a bus attribute and the destination MAC address is a non-bus device on the local device port The data frame of the address is only routed to the device port direction.

 [0012] According to another aspect of the present disclosure, there is also provided a bus architecture consisting of an Ethernet bus switch according to the present disclosure, wherein the transmission line connects a plurality of Ethernet bus switches via a network link port of the Ethernet bus switch, at least two At least one bus device is connected to one or more device ports of the Ethernet bus switch, so that multiple bus devices having the same MAC address can simultaneously receive the data frame destined for the MA C address, thereby implementing in a unicast manner. Point-to-multipoint and multipoint-to-multipoint communication.

[0013] According to still another aspect of the present disclosure, there is provided a data communication method on a bus architecture according to the present disclosure, comprising: one of a plurality of first bus devices from a user equipment port of a first Ethernet bus switch The first switching logic unit issues a first data frame having an Ethernet bus attribute; the first data reassembly unit of the first Ethernet bus switch copies the received first data frame and is first by the first Ethernet bus switch Routing the decision unit, the first data frame and its copy are respectively routed to a pair of network link port directions of the first Ethernet bus switch; at least one second Ethernet bus switch is received from the first via one of its paired network link ports a first data frame of the bus device, wherein the second routing decision unit of the second Ethernet bus switch determines that the destination MAC of the first data frame is the MAC of the second bus device connected to the user equipment port of the second Ethernet bus switch In case, the second data reassembly unit of the second Ethernet bus switch copies the first data frame, and the first data frame is routed to the second by the second routing decision unit of the second Ethernet bus switch. The direction of the second bus device on the user equipment port of the second switching logic unit of the Ethernet bus switch and Another copy of the route to the second direction port Ethernet switch pairs bus network link port data frame.

 [0014] According to the data communication method of the present disclosure, the method further includes: the second routing decision unit directly routing the first data frame to the case where it is determined that the destination MAC of the first data frame is not the MAC of the second bus device The other port direction of the paired network link port of the second Ethernet bus switch.

 [0015] According to the data communication method of the present disclosure, the method further includes: the first data reassembly unit adding a data frame ID to the first data frame before copying the first data frame and the second routing decision unit The data frame ID added before the first data frame is routed to the second bus device direction or the second data reassembly unit strips the first data frame. The data frame ID in the data frame may be a data frame sequence number based on a port that sends the data frame, and is also based on a data sequence number generated by a switch ID connected to the user equipment, or may include an active switch ID. , the destination switch ID, and the data frame sequence number generated based on the source switch ID.

 [0016] According to the data communication method of the present disclosure, the method further includes: when the second routing decision unit determines that the source MAC of the first data frame is the same as the MAC of the second bus device, the second data reassembly unit is first The source information and the destination information in the routing protocol field in the data frame are exchanged for reorganization; and the second routing decision unit routes the reassembled first data frame to the second bus device direction. The source information in the routing protocol field in the data frame contains information related to the routing, including, for example, a MAC address, an IP address (in the case of an IP layer), a port number, and the like.

[0017] According to the data communication method of the present disclosure, the method further includes: the second routing decision unit determining the first number According to the MAC address of the device on the user equipment port of the second switching logical unit, the destination MAC address of the frame is only routed to the other port direction of the pair of network link ports of the second Ethernet bus switch.

 [0018] According to the data communication method of the present disclosure, the method further includes: the second routing decision unit determining that the data frame from one of the pair of network link ports does not have a bus attribute and the destination MAC address is the second The MAC address of the non-bus device on the user equipment port of the switching logical unit is only routed to the user equipment port direction of the second switching logical unit.

 Advantageous effects of the invention

 Beneficial effect

 [0019] Therefore, according to the Ethernet bus switch of the present disclosure and the bus architecture formed by these switches, it is possible to implement point-to-multipoint communication between the bus devices in a unicast manner, and the unicast mode can also be obtained. Point-to-multipoint communication, thereby enabling multiparty calls on the bus. It not only achieves the certainty, stability and stability of communication, but also the advantages of high-speed, full-duplex communication of traditional Ethernet.

 Brief description of the drawing

 DRAWINGS

 [0020] The drawings herein are incorporated in and constitute a part of the specification, and are in accordance

1 is a schematic diagram showing the principle of an Ethernet switch according to a first embodiment of the present invention.

[0022] FIG. 2 is a flow chart showing the processing of data frames received by the Ethernet bus switch to the user access port according to the present disclosure.

 [0023] FIG. 3 is a flow chart showing the processing of data frames received from a network link channel in accordance with the present Ethernet bus switch.

[0024] FIG. 4 is a schematic diagram of an Ethernet bus according to the present disclosure.

 [0025] FIG. 5 is a schematic diagram showing a point-to-multipoint bidirectional communication process implemented in a unicast manner on an Ethernet bus according to the present disclosure.

6 is a schematic diagram of a non-destructive monitoring method according to the present disclosure. BEST MODE FOR CARRYING OUT THE INVENTION

 BEST MODE FOR CARRYING OUT THE INVENTION

[0027] The paragraphs describing the best mode of the invention are entered here.

Embodiments of the invention

 [0028] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. The description below refers to the accompanying drawings, and the same numerals in the different figures represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with aspects of the present disclosure as detailed in the appended claims.

 The terms used in the present disclosure are for the purpose of describing particular embodiments only, and are not intended to be limiting.

 The singular forms "a", "the" and "the" It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

 [0030] It should be understood that although the terms first, second, third, etc. may be used to describe various information in this disclosure, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, the first Ethernet bus switch may also be referred to as a second Ethernet bus switch without departing from the scope of the present disclosure. Similarly, the second Ethernet bus switch may also be referred to as a first Ethernet bus switch. Depending on the context, the word "if" as used herein may be interpreted as "in..." or

"When..." or "Responding to OK."

1 is a schematic diagram showing the principle of an Ethernet switch according to a first embodiment of the present invention. As shown in FIG. 1, the Ethernet bus switch 100 includes a switching logic unit 110 and a transmission logic component 120. The switching logic unit 110 and the transmission logic component 120 use a single channel or multiple channels for data interaction communication. Switching logic unit 110 has one or more ports 105 for accessing bus devices. Although the port here can be connected to a bus device, it can also be connected to a common networked device. The transport logic component 120 has a pair of network link ports VIII and ^ although shown here as a pair of network link ports A and B, but it can have two pairs of network link ports. Switching logic unit 110 forms a source MAC address table based on the source MAC address learning mechanism to receive and transmit data frames. The transport logic component 120 includes a data reassembly unit 121 and a routing decision unit 122. The data recombining unit 121 copies the data frame that needs to be bidirectionally transmitted, and the routing decision unit 12 2 routes the data frame and the copy thereof in two directions to implement bidirectional transmission.

 [0032] In addition, if a collision mechanism of the data frame needs to be implemented, a data frame ID generated based on the local switch ID may be added to the locally sent data frame. In the case where a specific routing protocol is required, such as routing based on the ID of the switch, the data reassembly unit 121 may add additional routing protocol data to the data frame, for example, the routing protocol may include the destination switch ID, the source switch ID. And a data frame sequence number (ie, a data frame ID) generated based on the source switch ID. In the present specification, routing decision unit 122 performs routing decisions based primarily on the bus device attributes of the data frame and the destination MAC.

 [0033] User equipment for the present Ether bus switch is typically a bus device. For the current network equipment, it usually has its own fixed MAC address, and the user can have its own requirements, and define the MAC with some characteristic data in some devices as the bus MAC, thereby making certain devices to be used have The bus attribute is such that the data frame it sends or the data frame destined for the MAC address with the bus characteristics has a bus attribute. Or, for some devices currently connected to the switch of the public office, register the device's own MAC address in the registration table in the switch, and indicate that it has a bus attribute in each registered MAC address entry. Thereby, a data frame having a MAC address is identified as a data frame having a bus attribute based on the registration table. Predictably, with the expansion of the application scope of the switch of the present disclosure, in order to adapt to the application of the switch of the present disclosure, all the network devices that need to be combined with the public switch can be given a fixed future. The "bus device attribute" is identified such that the switch will identify the bus attribute of the device and the bus attributes of the data frame associated with the device based on the bus attribute identification of the device.

 [0034] The data recombining unit 121 adds a data frame ID to the transmitted data frame and strips the data frame ID for the received data frame, and the routing decision unit 122 performs a data frame with the bus attribute from the data recombining unit 121. Send in both directions. Therefore, according to the Ethernet bus switch 100 of the present disclosure and the bus architecture formed by these switches, it is possible to realize point-to-multipoint communication between the bus devices by using unicast mode, and the unicast mode can also obtain multi-point pairs. Multi-point communication, thereby enabling multi-party calls on the bus. It not only achieves the certainty, stability and stability of communication, but also the advantages of high-speed, full-duplex communication of traditional Ethernet.

[0035] In addition, the data reorganization unit 121 can also activate another data reorganization function by configuration, that is, when According to the reorganization unit 121, it is known that the source MAC address in the data frame from one of the pair of network link ports is the same as the MAC address of the local bus device, and the source information in the routing protocol field in the data frame may be obtained (for example, The MAC address, IP address (in the case of an IP layer), port number), and destination information (for example, MAC address, IP address (in the case of an IP layer), port number) are exchanged for reorganization. Thus, in the case where two bus devices have the same MAC address, one of the bus devices can obtain communication information between the other bus device and other devices, thereby realizing real-time monitoring of data communication.

 [0036] In use, on the one hand, the Ethernet bus switch receives data frames from the user access port or device port 105, and on the other hand, the switch receives data frames from the network transmission channel.

 [0037] FIG. 2 is a flow chart showing the processing of data frames received by the Ethernet bus switch to the user access port according to the present disclosure. As shown in FIG. 2, at step S210, a data frame with a bus device attribute sent from user equipment A is received. Subsequently, at step S215, the data recombining unit 121 adds a data frame ID to the received bus attribute data frame. The data frame ID typically contains the switch ID to which the device is connected and the data sequence number generated based on the connected switch. Although the data frame ID is described here using the switch ID, there are other ways to set the data frame ID, such as the unique device serial number of each device. Of course, the data frame ID may also include other features for distinguishing the source of the data frame. By adding the data frame ID, the data frame can be adapted for transmission in an Ethernet network containing the present Ethernet bus switch. After the data frame is added with the data frame ID, the data frame with the bus attribute can be copied to obtain a copy of the original data frame.

 [0038] Then at step S220, the routing decision unit 122 determines that the data frame directly uses the two network connection ports of the switch as one port for routing decision, that is, the same route to the port corresponding to the two transmission channels, This enables bidirectional transmission of data frames sent by the local device port. Thus, when a bus set having the same MAC address on a user port of a different switch will receive the data frame at the same time, a point-to-multipoint communication based on unicast is realized.

[0039] FIG. 3 is a flow chart showing the processing of data frames received from a network link channel in accordance with the present Ethernet bus switch. As shown in FIG. 3, during use, when a source device, such as a bus device, sends a signal data frame to one or more user access devices 105 having a set MAC address connected to the user access port, The data frame usually contains the source MAC address of the source device and the destination device MAC address. Ben The public Ethernet bus switch can learn the MAC address of the source device and form a MAC address table, just like a normal switch. The MAC address table can contain device attribute information, such as whether it is a bus device. Whether the data frame has a bus device attribute, that is, whether the destination MAC address of the data frame has a bus MAC address attribute. Alternatively, it is also possible to determine whether the source MAC address and the destination MAC address have bus attributes. That is, by looking up the MAC address table of the switch, it is known whether the device corresponding to the destination MAC address is a bus device, thereby determining whether the data frame including the destination MAC address has a bus data frame attribute. The MAC address table learns the MAC address of each source device synchronously, and learns the device attributes corresponding to each MAC address, for example, whether it is a bus device. In addition, the paired network link ports are configured as a source MAC address learning port, that is, the MAC addresses learned from the network link ports A and B are all marked as the same port in the MAC address table. The routing decision unit 122 determines the routing direction of the data frame from the network link channel, such as transmission channel A. First, at step S305, the switch receives a data frame from its transmission channel A. Subsequently, at step S310, it is determined whether the data frame has received the data frame from the other side of the paired network link port, such as the network link channel B, based on the included data frame ID. This situation occurs when a switch is used in a ring network, so collision detection is required. If received, routing decision unit 122 discards the data. If not received, then at step S315 the routing decision unit 122 determines if the data frame has a bus device attribute, i.e., whether the destination MAC address of the data frame has a bus MAC address attribute. That is, by looking up the MAC address table of the switch, it is known whether the device corresponding to the MAC address is a bus device, thereby determining whether the data frame containing the destination MAC address has a bus data frame attribute. The MAC address table learns the MAC address of each source device synchronously, and learns the device attributes corresponding to each MAC address, for example, whether it is a bus device. Thus, when the routing decision unit 122 determines that the data frame has a bus attribute 吋, the data recombining unit 121 copies the data frame at step S320. Then, at step S325, the routing decision unit 122 directly routes a data frame to the port to which the transmission channel (for example, the transmission channel B) opposite to the transmission channel (for example, the transmission channel A) of the received data frame belongs; On the other hand, another data frame is routed to the direction of the user access port. Subsequently, at step S330, the routing decision unit determines whether the MAC address of the data frame is the MAC address of the device on the user access port owned by the local exchange. If it is determined that the MAC address is the MAC address of the device on the user access port owned by the local exchange, the routing decision unit 122 routes the data frame to use. The direction of the device on the access port of the user to download to the local device. Then at step S335, the data frame ID stripping is performed by the data recombining unit 121 to download the data frame stripped by the data frame ID to the local device by the switching logic component 110 at step S340. Thus, where the received data frame has a bus device attribute, routing decision unit 122 routes the data frame to the local user access port and to the transmission channel (eg, transmission channel A) of the received data frame. The port to which the channel (e.g., transmission channel A) belongs, thereby enabling bidirectional transmission if the data frame received from the transmission channel has a bus attribute and its destination MAC address is the MAC address of the local device.

 [0040] If it is determined in step S330 that the data frame MAC address is not the MAC address of the device on the user access port owned by the local exchange, the routing decision unit 122 does not perform data transmission to the port, but only in the step At S345, the port to which the data frame is routed to the transmission channel (e.g., transmission channel A) opposite to the transmission channel (e.g., transmission channel A) that receives the data frame is forwarded. This enables direct forwarding where the data frame received from the transmission channel has a bus attribute and its destination MAC address is not the MAC address of the local device. Although the description herein lists the order of judgment in the case where the data frame MAC address is not the MAC address of the device on the user access port owned by the local exchange, in practice, the processes of step S330 and step S320 may be performed simultaneously. Thus, in the case that the data frame MAC address is not the MAC address of the device on the user access port owned by the local switch, the routing decision result is obtained only to route the data frame to the countermeasure channel direction.

[0041] In addition, when the routing decision unit 122 determines in step S315 that the data frame does not have the bus attribute, it is directly determined in step S330 whether the MAC address is a device on the user access port owned by the local exchange. MAC address. On the one hand, if it is determined in step S330 that the MAC address is the MAC address of the device on the user access port owned by the local exchange, the routing decision unit 122 routes the data frame to the device on the user access port. Direction for download to local device. Then at step S335, the data frame ID stripping is performed by the data recombining unit 121 to download the data frame stripped by the data frame ID to the local device by the switching logic component 110 at step S340. This enables direct downloading in case the data frame received from the transmission channel does not have a bus attribute and its destination MAC address is the MA C address of the local device. On the other hand, if it is determined in step S330 that the MAC address is not the MAC address of the device on the user access port owned by the local exchange, the routing decision unit 22 routes the data frame to the transmission channel of the received data frame (eg Transmission channel A) relative transmission channel (for example, transmission channel A) The port to which it belongs is forwarded. This enables direct forwarding where the data frame received from the transmission channel does not have a bus attribute and its destination MAC address is not the MAC address of the local device.

 [0042] To this end, based on the above-described functions of the present Ethernet bus switch, the present invention proposes an Ethernet bus architecture 400 as described in FIG. Figure 4 is a schematic diagram of an Ethernet bus in accordance with the present disclosure. As shown in FIG. 4, there are a plurality of Ethernet bus switches 100-1, 100-2, ..., 100-N according to the present specification. It is connected in series via a transmission line via a network link port of an Ethernet bus switch. The active device 410 is connected under the Ethernet bus switch 100-1. Although referred to herein as the source device, it is also the destination device. The source device can be a normal bus device, a non-bus device, or a server or controller. Connect to the bus device on the user access port of each Ethernet bus switch 100-2, ... 100-N

1. Bus device 2. Line device -N+l. Although each Ethernet bus switch shown in Figure 4 is connected to only one bus device, each Ethernet bus switch can be connected to multiple devices. These devices can be bus devices, non-bus devices, or partial bus devices. And some non-bus devices.

 [0043] As with the data exchange process described above with reference to FIGS. 2 and 3, the data exchange process described in connection with FIGS. 2 and 3 can be performed between the various devices in the bus 400. For example, when, for example, source device 410 has a MAC1 address, it can be a bus device or a non-bus device. When the source device 410 transmits a data frame to one or more bus devices having the same MAC2 address (for example, transmitting a data frame to the bus device 1 and the bus device 2, both the bus device 1 and the bus device 2 receive the data frame. Therefore, although the data frame sent by the source device 41 0 is a unicast data frame, it implements a broadcast or multicast function, that is, a point-to-multipoint data transmission function. Subsequently, the bus device 1 and the bus device 2 both collide. The received data frame responds, each response containing the MAC1 address of the active device 410 as the destination address, and including the respective data frame ID. Thus, the source device 410 receives the bus device 1 and the bus device 2 The response, thereby achieving point-to-multipoint or even multipoint-to-multipoint bidirectional communication.

[0044] FIG. 5 is a schematic diagram of a point-to-multipoint bidirectional communication process implemented in a unicast manner on an Ethernet bus according to the present disclosure. As shown in Figure 5, the Ethernet bus switch treats the same type of device (the device with the same MAC address) as one device, that is, the same MAC address, so that when the same device responds to the source device, the MAC address will be learned. User access port and network link port, and according to this publication The Ethernet bus switch 100 sets the user access port and the network link port as separate learning mechanisms. For example, the access port learns the MAC address, and the network link port learns the ID of the source switch. Based on the Ethernet source MAC learning mechanism, the transport logic component 120 transmits the data sent from the source device to the two network link ports, so that all the bus devices receive the data from the source device. frame. At the same time, the source device can also receive response data frames from all bus devices. If only the traditional switch is used in this Ethernet bus architecture, when the two ports of the same switch learn the same MAC address, the target address conflict will occur due to the unicast peer-to-peer transmission mechanism, and the point-to-point collision cannot be achieved. Point data communication. Two-way forwarding and point-to-multipoint and multi-point to multi-point bidirectional communication are functions that are not possible with ordinary bus Ethernet.

 [0045] Based on the structure and unique performance of the present Ethernet bus switch 100, the present disclosure can provide a data communication method capable of implementing point-to-multipoint and multipoint-to-multipoint based on a unicast format. In conjunction with FIG. 4, one or more first bus devices (bus devices 1) are connected to the first Ethernet bus switch 100 (such as the Ethernet bus switch 1 in the figure), which are issued with the Ethernet bus via the first switching logic unit. The first data frame of the attribute. The first data reassembly unit 121 of the first Ether bus switch 100 copies the received first data frame and routes the first data frame and its replica by the first routing decision unit 122 of the first Ether bus switch. A pair of network link port directions to the first Ethernet bus switch 100.

[0046] The second Ethernet bus switch 100 (eg, the bus switch 0, the bus switch 2 in FIG. 4) receives the first data frame forwarded from the first Ethernet bus switch 100 via one of its respective network link ports. Or a copy thereof (hereinafter collectively referred to as the first data frame). After the second Ethernet bus switch 100 receives the first data frame from the first bus device via one of its paired network link ports, the second routing decision unit 122 of the second Ethernet bus switch determines the purpose of the first data frame. Whether the ground MAC is the MAC of the second bus device connected to the user equipment port of the second Ethernet bus switch. If so, the second data reassembly unit 121 of the second Ether bus switch 100 copies the first data frame and routes the first data frame by the second routing decision unit 122 of the second Ether bus switch 100. Orienting a second bus device (eg, bus device 2 or bus device 0) on a user equipment port of a second switching logical unit connected to the second Ethernet bus switch and routing a copy of the first data frame to the second Ethernet bus switch The other port direction of the paired network link port of 100. If the MAC address of the bus device N in the third Ethernet bus switch 100 (for example, the bus switch 3 or the bus switch N in FIG. 4) The bus device 2 has the same MAC address, which will also receive the first data frame. Thereby, communication of points (e.g., bus device 1) to multiple points (e.g., bus devices 2 and N) is achieved by unicast.

[0047] Similarly, when a bus device that receives the first data frame, such as bus device 2 and N, responds to the first data frame, its response data frame will also undergo the above data exchange process. Thereafter, the response data frame will be regarded as the "first data frame" in the above process, and the bus devices 2 and N will issue the response data frame as the "first bus device" of the above process, and The "bus device 1" of the destination bus device responding to the data frame will be regarded as the "second bus device" of the above process. Similarly, the Ethernet bus switch to which bus devices 2 and N are connected will be treated as the first Ethernet bus switch, and the Ethernet bus switch to which "bus device 1" is connected will be treated as the second Ethernet bus switch. Since the transmission process of the response data frame is the same as the transmission process of the first data frame, the detailed process will not be described in detail. Therefore, by the above manner, point-to-multipoint and multi-point peer-to-peer communication can be performed between bus devices under the Ethernet bus architecture.

 [0048] Due to the existence of the above-mentioned cross-communication based on the Ethernet bus architecture, the Ethernet bus architecture can be self-learned for device expansion, that is, only one Ethernet switch needs to be connected to the existing bus. If the bus device of the same MAC address is used, the link configuration is not required between the network devices, and the link can be established only by one communication, thereby eliminating the trouble of expanding the configuration on the existing Ethernet or the conventional bus.

[0049] Due to the existence of the above-mentioned cross-communication based on the Ethernet bus architecture, according to the technical solution of the present disclosure, there is a data lossless monitoring method based on the Ethernet bus switch. Generally, in the Ethernet bus and various networks, in order to perform communication and data monitoring, a certain degree of damage to the network is required. For example, in the path before the device that receives and transmits data, the intrusion damage method is used to monitor the data for implementation. Data diagnosis. Or store communication data on the local device by other means for later data diagnosis. What's more, you need to edit specific software to intercept the data. These methods of monitoring data have higher costs or damage to the network itself. On the bus network using the public Ethernet bus switch, the lossless real-time monitoring can be realized. Figure 6 is a schematic illustration of a non-destructive monitoring method in accordance with the present disclosure. As shown in FIG. 6, a third bus device (not shown) is coupled to the left transmission channel port of the Ethernet bus switch described by the first bus device (shown as device 1 in the figure) via a network link channel. The third device can communicate with the first bus device. The device 1 has a configured MAC address MAC1. In order to non-destructively monitor the communication between the third device and the first bus device, a bus device, such as a second bus device, can be connected to the user access port of any Ethernet bus switch on the bus according to the present disclosure. Configure its MAC address to be the same MAC1 as the MAC address of the first device. Simultaneously enabling or activating the address exchange reassembly function of the data reassembly unit 121 in the Ethernet bus switch to which the second bus device belongs, that is, when the destination MAC address of the data frame received from the transmission channel is the same as the MAC address of the local device吋, exchange source information of the routing protocol in the received data frame with destination information, such as destination MAC address in the routing protocol included in the data frame, destination IP (if any), and port and source MAC The data reassembly function of the new data frame is formed after the address, destination 1 (if any) and port are exchanged. After being processed in this way, the second bus device can actually monitor the complete communication process between the first bus device and the third bus device without affecting the communication between the first bus device and the third device. There is also no need to cause physical damage to the communication link between the first bus device and the third device.

 [0050] Specifically, when the Ethernet bus switch to which the first bus device belongs receives the bus data frame sent by the third device to the device 1 as the first bus device, the transmission logic component 120 of the Ethernet bus switch The routing decision unit 121 performs bidirectional transmission based on the MAC address determination MAC address in the switch MAC address table, and then the data reassembly unit 122 copies the data frame. Then one of them sends the relative transmission channel, and the other is stripped of the data frame ID by the data reassembly unit 122 and sent to the local switching logic component 110. The data frame after the data frame ID is stripped by the data recombining unit is downloaded to the first bus device. The peer is forwarded to the Ethernet bus switch to which the device 2 to which the second bus device or the listening device belongs. Similarly, the routing decision unit 121 and the data recombining unit 122 of the transport logic component 120 of the Ethernet bus switch to which the second bus device belongs perform the same processing on the data frame, and the data of the listening device routed to the local user access port. The frame is subjected to stripping data frame ID processing and then downloaded to the device 2 via the switching logic component 110, whereby the device 2 acts as a listening device, obtaining data sent by the third device to the device 2 as the second bus device.

[0051] Further, when the device 1 responds to the received data frame, it sends a response data frame to the third bus device, where the source address of the response data frame is MAC1 and the destination address is M of the third bus device. AC address. Since the third device described by the destination MAC address is a bus device, the response data frame has a bus attribute. Thus, the response data frame is routed by the routing decision unit 121 to the opposite transmission channel. The track is forwarded in both directions. The response data frame is then added by the data reassembly unit 122 to the data frame ID and copied. In one aspect, one of the response data frames is forwarded to the left to the Ethernet bus switch to which the third bus device belongs and is received by the third bus device, thereby obtaining a response data frame for the data frame to which the first bus device issues. On the other hand, another copy of the data frame is forwarded via the right transmission channel to the Ethernet bus switch to which the second bus device belongs. The routing decision unit 121 of the Ethernet bus switch to which the second bus device belongs is directly routed to the local user access port direction for the data frame whose source MAC address transmitted from the transmission channel is the same as the MAC address of the local device, and is reconstructed by the data reorganization unit. 122. After the source MAC address in the received response data frame copy is the same as the MAC address of the second bus device, the source MAC address and the destination MAC address in the data frame are exchanged for reorganization and data reorganization Unit 122 strips the data frame ID and downloads it to the second bus device. Thereby, a response data frame transmitted by the first bus device to the third bus device is obtained, thereby listening to the return data.

[0052] Through the above process, the second bus device as the listening device can thus reliably monitor the communication between the third bus device and the first bus device. The traditional data monitoring method is to add a special monitoring device at the node to capture and filter the data of the monitored object to the processing platform. This way of monitoring increases the cost of additional monitoring equipment and the data of the listening device. The secondary processing brings data security risks. The utility model uses the above features to monitor the original data in the current environment, and does not increase the additional cost, nor does it need to capture and filter the data to ensure data transmission security.

[0053] In summary, the Ethernet bus switch based on the present invention treats the same type of bus device as one device, that is, configures the same MAC address, so when the same type of bus device responds to the source device, the MAC address will be learned. On the application port and the transmission port, the Ethernet bus switch sets the application port and the transmission port as separate learning mechanisms. When the two ports learn the same MAC address, they are not regarded as MAC conflicts, but the port is also considered to have the device. Access. Based on the Ethernet source MAC learning mechanism, the transmission logic transmits the data sent from the source device to both ports, so that all devices receive the data from the source device. At the same time, the source device can also receive response data from all devices. Therefore, the Ethernet bus switch based on the present invention adopts a full-duplex communication mode, follows the learning mechanism of the Ethernet source mac address, and performs point-to-multipoint bidirectional data interaction by using unicast. When a device is added to the network, only the currently existing link can complete the data interaction with the newly added device. Instead, using a traditional switch, in the current shelf Under the circumstance, when the two ports learn the same mac address, the target address conflict occurs due to the unicast peer-to-peer transmission mechanism, and point-to-multipoint data communication cannot be achieved.

[0054] Referring back to FIG. 1, the switching logic unit 110 also performs a conventional data communication exchange process on the device data frame from the local device, and the data frame from the local device can be pre-processed with the MAC address table for the destination. The data frame whose MAC address is the address of the other local port device is directly sent to the other local port device.

 [0055] The basic principles of the present disclosure have been described above in connection with the specific embodiments, but it should be noted that those skilled in the art can understand all or any of the steps or components of the method and apparatus of the present disclosure. It can be implemented in hardware, firmware, software, or a combination thereof in any computing device (including a processor, storage medium, etc.) or a network of computing devices, as those of ordinary skill in the art have read the description of the present disclosure. The situation can be achieved with their basic programming skills.

 [0056] Accordingly, the purpose of the present disclosure can also be achieved by running a program or a set of programs on any computing device. The computing device can be a well-known general purpose device. Accordingly, the purpose of the present disclosure can also be achieved by merely providing a program product comprising program code for implementing the method or apparatus. That is to say, such a program product also constitutes the present disclosure, and a storage medium storing such a program product also constitutes the present disclosure. It will be apparent that the storage medium may be any well-known storage medium or any storage medium that will be elucidated in the future.

 It should also be noted that in the apparatus and method of the present disclosure, it is apparent that various components or steps may be decomposed and/or recombined. These decompositions and/or recombinations shall be considered equivalent to this publication. Further, the steps of performing the above-described series of processing can be naturally performed in the order of the description in the order, but need not necessarily be performed in the order of the day. Some steps can be performed in parallel or independently of each other. For example, routing decisions and data reorganization processes can be performed in parallel or sequentially, and the processes performed by the two are in no particular order. In the case where sequential processing is required, a technician can perform the setting. For example, in the case of monitoring, the transmission logic component 110 of the listening device may be configured to first perform MAC address resolution on the transmitted data, and first exchange and reassemble the data frame whose source MAC address is the same as the MAC of the local monitoring device, and then The routing decision unit makes a routing decision to route to the listening device to obtain a response data frame of the monitored device.

[0058] The above specific embodiments do not constitute a limitation on the scope of protection of the present disclosure. Those skilled in the art should It is understood that various modifications, combinations, sub-combinations and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this Convention shall be covered by this Convention.

 [0059].

 Industrial applicability

[0060] Enter the paragraph of industrial applicability description here.

[0061]

Claims

Claim An Ethernet bus switch, including: One or more device ports; a pair of network link ports; The switching logic unit transmits or receives a data frame and learns the source device MAC address of the received data frame based on the source MAC address learning mechanism and stores it in the MAC address table; and a transmission logic component, comprising: a routing decision unit and a data reassembly unit, wherein the data reassembly unit copies a data frame from the device port for routing decision units to route the data frame to the pair of network link port directions, and data Recombining unit copies a data frame from one of the pair of network link ports having a bus attribute and a destination MAC address as a MAC address of a bus device on the local device port, so that the routing decision unit routes the data frame to The device port direction and the other port direction of the pair of network link ports enable point-to-multipoint communication in a unicast manner. The Ethernet bus switch of claim 1 wherein said data reassembly unit adds a data frame ID for data frames transmitted from the device port via the switching logic unit and strips the data frame ID for data frames received from the routing decision unit. The Ethernet bus switch of claim 2 wherein said data frame ID comprises a data frame sequence number generated based on a source switch ID. The Ethernet bus switch of claim 2 wherein said data frame ID comprises an active switch ID, a destination switch ID, and a data frame sequence number generated based on the source switch ID. The Ethernet bus switch according to any one of claims 1 to 4, wherein said data recombining unit has the same source MAC address in the data frame from one of said pair of network link ports as the MAC address of the local bus device, The source information and the destination information in the routing protocol field in the data frame are exchanged for reorganization. The Ethernet bus switch according to any one of claims 1 to 4, wherein said routing decision unit does not locally set a destination MAC address from one of said pair of network link ports The data frame of the MAC address of the device on the standby port is only routed to the other port direction of the pair of network link ports.  [Embodiment 7] The Ethernet bus switch according to any one of claims 1 to 4, wherein said routing decision unit has no bus attribute from one of said pair of network link ports and destination M AC address is local The data frame of the MAC address of the non-bus device on the device port is only routed to the device port direction.  [Claim 8] A bus architecture comprising an Ethernet bus switch according to any one of claims 1-7, wherein the transmission line connects a plurality of Ethernet bus switches via a network link port of the Ethernet bus switch, at least two Ethernet bus switches At least one bus device is connected to one or more device ports, so that a plurality of bus devices having the same MAC address can simultaneously receive a data frame destined for the MAC address, thereby implementing point-to-multipoint in a unicast manner and Multi-point to multi-point communication.  [Claim 9] A data communication method comprising:  Transmitting, by one of the plurality of first bus devices, a first data frame having an Ethernet bus attribute from a user equipment port of the first Ethernet bus switch via the first switching logic unit; The first data reassembly unit of the first Ethernet bus switch copies the received first data frame, and the first data frame and the copy thereof are routed by the first routing decision unit of the first Ethernet bus switch to the first a pair of network link ports of an Ethernet bus switch, at least one second Ethernet bus switch receiving a first data frame from the first bus device via one of its paired network link ports, and a second Ethernet bus switch The second routing unit determines that the destination MAC of the first data frame is the MAC of the second bus device connected to the user equipment port of the second Ethernet bus switch, and the second data reassembly unit of the second Ethernet bus switch Copying the first data frame and routing the first data frame by the second routing decision unit of the second Ethernet bus switch to the second on the user equipment port of the second switching logical unit connected to the second Ethernet bus switch Bus device direction and a pair of network link ports that route a copy of the first data frame to the second Ethernet bus switch Another port direction. The data communication method according to claim 9, further comprising: The second routing decision unit directly routes the first data frame to another port direction of the paired network link port of the second Ethernet bus switch in a case where it is determined that the destination MAC of the first data frame is not the MAC of the second bus device . The data communication method according to claim 9 or 10, further comprising: said first data recombining unit adding a data frame ID to the first data frame before copying the first data frame and in the second routing decision unit The data frame ID added before the first data frame is routed to the second bus device direction or the second data reassembly unit strips the first data frame. The data communication method according to claim 11, further comprising: Determining, at the second routing decision unit, the source MAC of the first data frame and the MA of the second bus device In the case of the same C, the second data recombining unit exchanges the source information and the destination information in the routing protocol field in the first data frame to implement reorganization; The second routing decision unit routes the reassembled first data frame to the second bus device direction. The data communication method according to claim 9 or 10, further comprising: The second routing decision unit only routes the first data frame to the second Ethernet bus switch after determining that the destination MAC address of the first data frame is not the MAC address of the device on the user equipment port of the second switching logical unit The other port direction of a pair of network link ports. The data communication method according to claim 9, further comprising: The second routing decision unit determines that a data frame from one of the pair of network link ports does not have a bus attribute and the destination MAC address is a MAC address of a non-bus device on a user equipment port of the second switching logical unit. , only routing the data frame to the user equipment port direction of the second switching logical unit.