WO2020240833A1 - Dispositif de réseau redondant, procédé de réseau redondant, programme de réseau redondant et système de redondance de trajet de transmission - Google Patents

Dispositif de réseau redondant, procédé de réseau redondant, programme de réseau redondant et système de redondance de trajet de transmission Download PDF

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Publication number
WO2020240833A1
WO2020240833A1 PCT/JP2019/021768 JP2019021768W WO2020240833A1 WO 2020240833 A1 WO2020240833 A1 WO 2020240833A1 JP 2019021768 W JP2019021768 W JP 2019021768W WO 2020240833 A1 WO2020240833 A1 WO 2020240833A1
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Prior art keywords
hops
network device
request
redundant network
clockwise
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PCT/JP2019/021768
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English (en)
Japanese (ja)
Inventor
洋平 安友
敏典 堀
正基 田中
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三菱電機株式会社
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Priority to PCT/JP2019/021768 priority Critical patent/WO2020240833A1/fr
Publication of WO2020240833A1 publication Critical patent/WO2020240833A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks

Definitions

  • the present invention relates to a redundant network device, a redundant network method, a redundant network program, and a transmission path redundant system.
  • a network with a ring-type network topology called a ring network is used for industrial networks such as factories.
  • the ring network has excellent fault tolerance, and many methods for improving the fault tolerance of the ring network have been proposed.
  • Patent Document 1 when a failure occurs in a link between devices constituting the ring network in the ring network, the device adjacent to the failure occurrence position takes a clockwise and counterclockwise path.
  • a method is disclosed in which a device that transmits a message indicating a failure position according to a predetermined protocol and receives the message updates the routing table so as to avoid the failure position indicated in the message.
  • the data transferred by the network devices that make up the ring network is roughly divided into those that are sent by other network devices that make up the ring network and those that are sent by PCs, sensors, networks, etc. that are connected to the network devices. Ru.
  • the network device that receives the latter data and transfers it to the ring network becomes a single point of failure.
  • the plurality of network devices that transfer the data received from the outside of the ring network to the ring network transmit in both clockwise and counterclockwise directions. Therefore, there is a problem that the same data flows multiple times in one path and the bandwidth is tight. As a specific example, when there are two network devices, the transfer of data received from the outside of the ring network requires twice as much bandwidth as in the case of no redundancy.
  • the redundant network device of the present invention A ring network whose network topology is a ring type, which is a redundant network device constituting a ring network including a plurality of redundant network devices.
  • a hop number table that stores the number of counterclockwise hops and the number of counterclockwise hops corresponding to each of the plurality of redundant network devices.
  • the transmission data is transmitted in the clockwise direction.
  • the transmission data is transmitted in the counterclockwise direction. It is provided with a transmission direction determination unit that determines transmission.
  • the transfer data received from the outside of the ring network to the destination device in the ring network When the number of clockwise hops to the destination device is the smallest among the number of clockwise hops to the destination device of the redundant network device constituting the ring network, the transfer data is transferred in the clockwise direction. When the number of counterclockwise hops to the destination device is the smallest among the number of counterclockwise hops to the destination device of the redundant network device constituting the ring network, the transfer data is transferred in the counterclockwise direction. Therefore, according to the redundant network device of the present invention, redundancy can be achieved without increasing the required bandwidth, and a single point of failure can be eliminated.
  • the flowchart which shows the operation of the procedure D which concerns on Embodiment 2.
  • Example of transmission direction table 126. An example of the hop count table 125.
  • FIG. 1 is a configuration example of a transmission path redundancy system including a ring network including the redundant network device 31 and the redundant network device 32 according to the present embodiment.
  • the network targeted by the present embodiment is a ring network whose network topology is a ring type.
  • the ring network is composed of a redundant network device 31, a redundant network device 32, and network devices 41 to 44.
  • the redundant network device 31 and the redundant network device 32 are redundant network devices that form a ring network including a plurality of redundant network devices.
  • the configuration of the redundant network device 31 is It may be the same as the configuration of the redundant network device 32. It may be the same as any configuration of the network devices 300 to 600.
  • a network device in general rather than a specific network device, it is referred to as a network device without a code. The same applies to the redundant network device, the information transmission source, and the components constituting the redundant network device.
  • the term network device is Unless otherwise specified, redundant network equipment shall be included. Unless otherwise specified, it refers to the network devices that make up the ring network.
  • the term redundant network device refers to a network device that makes the transmitted data transmitted to the destination network device transmitted by the information source redundant. Unless otherwise specified, it refers to redundant network devices that make up a ring network.
  • the transmitted data refers to the data transmitted by the information source to the network devices constituting the ring network.
  • the destination network device refers to a network device that is a destination of transmission data when an information source transmits transmission data to the network device.
  • the number of network devices may be arbitrary, and any number of network devices constituting the ring network may be redundant network devices.
  • the network devices may be connected by any method. The network devices do not have to be all the same. Hereinafter, the same applies when the connection is described.
  • the source of information is It is connected to a redundant network device and It may be any one such as a PC, a sensor, or a network.
  • the information source 51 is In this example, the redundant network device 31 and the redundant network device 32 are connected, It may be connected to any number of redundant network devices.
  • the information transmission source 51 transmits transmission data to the destination network device
  • the information transmission source 51 transmits the same transmission data to the redundant network device 31 and the redundant network device 32.
  • the redundant network device 31 and the redundant network device 32 transfer transmission data to the ring network.
  • FIG. 2 is another configuration example of a transmission path redundancy system including a ring network including the redundant network device 31 and the redundant network device 32 according to the present embodiment.
  • the information transmission source 51 and the information transmission source 52 synchronize with each other to transmit the same transmission data to the redundant network device 31 and the redundant network device 32, respectively.
  • any number of information transmission sources may exist.
  • at least one of the information transmission sources may be connected to a plurality of redundant network devices. When there are a plurality of information sources, the information sources do not have to be the same.
  • FIG. 3 is an example of a configuration diagram of the redundant network device 31. Since the configuration of the redundant network device 32 is the same as the configuration of the redundant network device 31, the redundant network device 31 will be described. As shown in this figure, the redundant network device 31 includes a communication path redundancy unit 120 in addition to the data transmission / reception unit 111 and the data transfer unit 112.
  • the data transmission / reception unit 111 transmits / receives data.
  • the data transfer unit 112 transfers the data that needs to be transferred to the outside among the data received by the data transmission / reception unit 111.
  • the communication path redundancy unit 120 includes a hop number investigation unit 121, a hop number transmission / reception unit 122, a hop number table creation unit 123, a transmission direction determination unit 124, a hop number table 125, and a transmission direction table 126. Will be done.
  • the hop number investigation unit 121 investigates the number of bidirectional hops from the redundant network device 31 to each network device.
  • the number of bidirectional hops is a general term for the number of clockwise hops and the number of counterclockwise hops.
  • the number of clockwise hops is the number of network devices that pass through the ring network in the clockwise direction, from the redundant network device to the network device.
  • the number of counterclockwise hops is similar to the number of clockwise hops, except that the ring network is traced counterclockwise. Either direction of the ring network may be regarded as the clockwise direction, and the direction opposite to the direction regarded as the clockwise direction is regarded as the counterclockwise direction.
  • the hop number investigation unit 121 may investigate the number of hops in both directions to each network device by an arbitrary method.
  • the hop number investigation unit 121 investigates the number of clockwise hops corresponding to the request for transmitting transmission data to the destination network device and the number of counterclockwise hops corresponding to the request.
  • the hop number investigation unit 121 investigates the number of hops in both directions assuming that the request exists even if the request for transmitting the transmission data does not actually exist. In the following, the request to transmit the transmission data does not have to actually exist.
  • the number of clockwise hops corresponding to the request for transmitting transmission data to the destination network device is the clockwise hop from the redundant network device 31 to the destination network device when any network device is regarded as the destination network device. It's a number.
  • the hop number transmission / reception unit 122 Information on the number of hops in both directions investigated by the hop number investigation unit 121 is transmitted to the hop number table creation unit 123 and other redundant network devices.
  • Number of hops in other redundant network devices Receives information on the number of hops in both directions transmitted by the transmitter / receiver. That is, the hop number transmission / reception unit 122 Data including the number of clockwise hops corresponding to the request for transmitting transmission data to the destination network device and the number of counterclockwise hops corresponding to the request is transmitted to another redundant network device provided in the ring network. Data including the number of clockwise hops corresponding to the request and the number of counterclockwise hops corresponding to the request is received from another redundant network device included in the ring network.
  • the other redundant network device is another redundant network device that constitutes the ring network.
  • the hop number table creation unit 123 determines the number of bidirectional hops for each network device other than the redundant network device based on the number of bidirectional hops investigated by the hop number survey unit 121 and the number of bidirectional hops received by the hop number transmission / reception unit 122.
  • the hop number table 125 shown is created.
  • the hop number table creation unit 123 may create a separate hop number table 125 for each network device.
  • the hop number table creation unit 123 includes the number of clockwise hops corresponding to the request for transmitting transmission data to the destination network device investigated by the hop number investigation unit 121, and the number of counterclockwise hops corresponding to the request.
  • the hop number table 125 is created based on the number of clockwise hops corresponding to the request and the number of counterclockwise hops corresponding to the request received by the hop number transmission / reception unit 122.
  • the hop number table 125 is a clockwise hop number corresponding to a request for transmitting transmission data to a destination network device constituting a ring network, and includes a clockwise hop number corresponding to each of a plurality of redundant network devices and the above-mentioned.
  • the number of counterclockwise hops corresponding to the request, and the number of counterclockwise hops corresponding to each of the plurality of redundant network devices is stored.
  • the hop number table 125 stores the number of clockwise hops corresponding to the request received by the hop number transmission / reception unit 122 and the number of counterclockwise hops corresponding to the request.
  • FIG. 12 is an example of the hop number table 125 destined for the network device 42 in the system configuration example shown in FIG.
  • the hop number table 125 can hold information on the number of hops to a network device that can be a destination for each redundant network device.
  • the network device that can be the destination typically refers to a network device other than the redundant network device that constitutes the ring network.
  • Network devices that can be destinations may include redundant network devices.
  • the transmission direction determination unit 124 Based on the hop number table 125, the transmission direction, which is the direction in which transmission data is transmitted, is determined for each network device that can be a destination.
  • the transmission direction table 126 is created based on the determined transmission direction.
  • the transmission direction determination unit 124 may create a separate transmission direction table 126 for each network device.
  • the transmission direction determination unit 124 has the smallest number of clockwise hops corresponding to itself among the number of clockwise hops corresponding to the request for transmitting transmission data to the destination network device stored in the hop number table 125. If you decide to send the send data in the clockwise direction, When the number of counterclockwise hops corresponding to itself is the smallest among the number of counterclockwise hops corresponding to the request stored in the hop number table 125, the transmission data is transmitted in the counterclockwise direction. To determine.
  • FIG. 13 is an example of the transmission direction table 126 of the redundant network device 31 in the system configuration example shown in FIG.
  • the transmission direction table 126 can hold the direction in which transmission data is transmitted for each network device that can be a destination.
  • the transmission direction table can hold that the transmission data is not transmitted to the network device.
  • the format for not transmitting may be arbitrary.
  • the transmission direction from the redundant network device 31 to the destination network device follows the transmission direction table 126.
  • FIG. 4 is an example of a hardware configuration diagram of the redundant network device 31.
  • the redundant network device 31 includes a processor 11 that performs operations such as sending and receiving data and operating a table, and a memory 12 that stores data and temporary storage required for operations by the processor 11.
  • the storage device 13 includes a port 15 connected to an information transmission source, a port 16 for transmitting in the clockwise direction, and a port 17 for transmitting in the counterclockwise direction.
  • the hop number investigation unit 121, the hop number table creation unit 123, and the transmission direction determination unit 124 are composed of a processor 11 and a memory 12.
  • the hop number table 125 and the transmission direction table 126 are composed of the memory 12.
  • the hop number table 125 and the transmission direction table 126 may be configured by the storage device 13.
  • the data transmission / reception unit 111 includes a processor 11, a memory 12, a port 15, a port 16, and a port 17.
  • the data transfer unit 112 and the hop number transmission / reception unit 122 are composed of a processor 11, a memory 12, a port 16, and a port 17.
  • the redundant network device 31 is composed of a general computer 10.
  • the processor 11 is connected to other hardware via the data bus 14 (signal line) and controls these other hardware.
  • the storage device 13 stores the redundant network program.
  • the processor 11 is a processing device that executes a program, an OS (Operating System), and the like.
  • the processing device is sometimes called an IC (Integrated Circuit), and the processor 11 is, for example, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a GPU (Graphics Processing Unit).
  • the processor 11 reads and executes the program stored in the memory 12.
  • the computer 10 in this figure includes only one processor 11, but the computer 10 may include a plurality of processors that replace the processor 11. These plurality of processors share the execution of programs and the like.
  • the memory 12 is a storage device that temporarily stores data, and functions as a main memory used as a work area of the processor 11.
  • the memory 12 is a RAM (Random Access Memory) such as a SRAM (Static Random Access Memory) or a DRAM (Dynamic Random Access Memory).
  • the memory 12 holds the calculation result of the processor 11.
  • the storage device 13 is a storage device that stores data non-volatilely, and stores the OS, each program executed by the processor 11, data used when executing each program, and the like. Specific examples of the storage device 13 are an HDD (Hard Disk Drive) and an SSD (Solid State Drive).
  • the storage device 13 includes a memory card, an SD (Secure Digital, registered trademark) memory card, a CF (Compact Flash), a NAND flash, a flexible disk, an optical disk, a compact disk, a Blu-ray (registered trademark) disk, and a DVD (Digital Whatever Disk). ) Etc. may be a portable recording medium.
  • Ports 15 to 17 are interfaces for communicating with an external device. Specific examples of the ports 15 to 17 are Ethernet (registered trademark), USB (Universal Serial Bus), or HDMI (registered trademark, High-Definition Multimedia Interface) ports.
  • the port 15 is a port that receives transmission data from an information source.
  • the port 16 is a port for transmitting and receiving data in the clockwise direction of the ring network.
  • the port 17 is a port for transmitting and receiving data in the counterclockwise direction of the ring network. It should be noted that each of the ports 15 to 17 may exist in plurality, and the ports 15 to 17 do not have to be separate ports.
  • the OS is loaded from the storage device 13 by the processor 11, expanded into the memory 12, and executed on the processor 11.
  • the OS may be any one compatible with the processor 11, such as Linux (registered trademark) or Windows (registered trademark).
  • the redundant network program and the OS may be stored in the memory 12.
  • the redundant network device executes the procedure A and the procedure B.
  • Procedure A includes a process in which the redundant network device transmits information on the number of hops from itself to each network device to other redundant network devices.
  • Procedure B includes a process of determining the transmission direction for each network device that can be a destination.
  • the operation procedure of the redundant network device corresponds to the redundant network method. Further, the program that realizes the operation of the redundant network device corresponds to the redundant network program.
  • FIG. 5 is an example of a flowchart showing the operation of procedure A. The order of processing shown in this flowchart may be changed as appropriate.
  • the procedure A executed by the redundant network device 31 in the system configuration of FIG. 1 will be described with reference to the flowchart shown in FIG.
  • Step S1 Hop number investigation process
  • the hop number investigation unit 121 investigates the number of bidirectional hops from the redundant network device 31 to each network device that can be a destination based on the data transmitted / received by the data transmission / reception unit 111.
  • Step S2 Hop number transmission process
  • the hop number transmission / reception unit 122 transmits the obtained bidirectional hop number information to the hop number table creation unit 123 and the redundant network device 32.
  • FIG. 6 is an example of a flowchart showing the operation of procedure B. The order of processing shown in this flowchart may be changed as appropriate.
  • the procedure B executed by the redundant network device 31 in the system configuration of FIG. 1 will be described along with the operation flow of FIG.
  • Step S3 Hop number reception process
  • the hop number transmission / reception unit 122 receives the information on the number of bidirectional hops transmitted in the procedure A.
  • Step S4 Hop number table creation process
  • the hop number table creation unit 123 creates a hop number table 125 for each possible destination network device based on the information received in step S3.
  • Step S15 Destination determination process
  • the transmission direction determination unit 124 selects one network device whose transmission direction has not yet been determined by the redundant network device 31 among the network devices that can be destinations.
  • the network device selected in this step is expressed as a destination.
  • the transmission direction determination unit 124 has selected the network device 42. That is, the hop number table 125 is shown in FIG.
  • Step S5 Minimum number of hops confirmation process
  • the transmission direction determination unit 124 confirms whether or not the hop number table 125 has a plurality of minimum hops, which is the minimum number of all clockwise hops and all counterclockwise hops.
  • the transmission direction determination unit 124 If there are a plurality of minimum hops in the hop number table 125, the process proceeds to step S6. Otherwise, the process proceeds to step S9. In FIG. 12, since the minimum number of hops is 2 and the minimum number of hops is 1, the transmission direction determination unit 124 proceeds to step S9.
  • Step S9 Minimum number of hops device confirmation process
  • the transmission direction determination unit 124 Make sure the minimum number of hops corresponds to you, That is, it is confirmed whether either the number of clockwise hops corresponding to the self or the number of counterclockwise hops is the minimum number of hops.
  • the transmission direction determination unit 124 If the minimum number of hops corresponds to itself, the process proceeds to step S11. In other cases, the process proceeds to step S10. In FIG. 12, since the minimum number of hops corresponds to the redundant network device 32, the transmission direction determination unit 124 proceeds to step S10.
  • Step S10 Reverse direction confirmation process
  • the transmission direction determination unit 124 Refer to the number of hops in the opposite direction corresponding to the minimum number of hops, Make sure that the smallest number of hops out of all hops in the opposite direction corresponds to itself.
  • the direction opposite to the direction corresponding to the minimum number of hops is the counterclockwise direction, and the minimum number of hops among all the counterclockwise hops is 3.
  • the redundant network device 31 proceeds to step S12 in order to correspond to the minimum number of hops.
  • Step S12 Transmission direction recording process
  • the transmission direction determination unit 124 records the reverse direction in the transmission direction table 126 as the transmission direction to the destination.
  • the transmission direction determination unit 124 records the counterclockwise direction in the transmission direction table 126 as the transmission direction to the destination.
  • Step S14 Transmission direction table confirmation process
  • the transmission direction determination unit 124 confirms whether or not the transmission directions of all the network devices that can be destinations have been determined.
  • the transmission direction determination unit 124 When the transmission direction of all network devices that can be destinations is determined, procedure B is completed and procedure B is completed. In other cases, the process proceeds to step S15.
  • Step S9 Minimum number of hops device confirmation process
  • the minimum hop corresponds to the redundant network device 32. Therefore, the transmission direction determination unit 124 proceeds to step S11.
  • Step S11 Transmission direction recording process
  • the transmission direction determination unit 124 records the direction corresponding to the minimum number of hops in the transmission direction table 126 as the transmission direction to the destination. Since the direction corresponding to the minimum number of hops is the clockwise direction, the transmission direction determination unit 124 records the clockwise direction in the transmission direction table 126 as the transmission direction to the network device 42.
  • FIG. 7 is a configuration example of a transmission path redundancy system including a ring network including the redundant network device 31 and the redundant network device 32 according to the present embodiment.
  • FIG. 14 is an example of the hop number table 125 destined for the network device 43 in the system configuration shown in FIG. 7.
  • step S15 the transmission direction determination unit 124 selects the network device 43 in step S15. That is, the hop number table 125 is shown in FIG.
  • the processing before step S5 is the same as the processing of the redundant network device 31, and is therefore omitted.
  • Step S5 Minimum number of hops confirmation process
  • the minimum number of hops is 3, and there are a plurality of minimum hops. Therefore, the transmission direction determination unit 124 proceeds to step S6.
  • Step S6 Minimum number of hops device confirmation process
  • the transmission direction determination unit 124 make sure the minimum number of hops corresponds to you, That is, it is confirmed whether either the number of clockwise hops corresponding to the self or the number of counterclockwise hops is the minimum number of hops.
  • the transmission direction determination unit 124 If the minimum number of hops corresponds to itself, the process proceeds to step S7. In other cases, the process proceeds to step S8. In FIG. 14, since the minimum number of hops is 3 and the number of counterclockwise hops of the redundant network device 31 is the minimum number of hops, the transmission direction determination unit 124 proceeds to step S7.
  • Step S7 Transmission direction recording process
  • the transmission direction determination unit 124 records the direction corresponding to the minimum number of hops in the transmission direction table 126 as the transmission direction to the destination.
  • the transmission direction determination unit 124 records the counterclockwise direction, which is the direction corresponding to the minimum number of hops, in the transmission direction table 126 as the transmission direction to the destination.
  • step S14 is the same as the processing already described, so it is omitted.
  • procedure B *** Explanation of other operations of procedure B *** Hereinafter, among the processes of procedure B, the processes not described above will be described as being performed by the redundant network device 31.
  • Step S8 Non-transmission recording process
  • the transmission direction determination unit 124 records in the transmission direction table 126 that the redundant network device 31 does not transmit transmission data.
  • Step S13 Non-transmission recording process
  • the processing of this step is the same as the processing of step S8.
  • the transmission direction determination unit 124 Does the hop number table 125 store a plurality of the minimum number of hops among the number of clockwise hops corresponding to the request for transmitting transmission data to the destination network device and the number of counterclockwise hops corresponding to the request? Confirmed, When the hop count table 125 stores a plurality of minimum hop counts, If the minimum number of hops corresponds to the number of clockwise hops corresponding to the request, the transmission data is determined to be transmitted in the clockwise direction. When the minimum number of hops corresponds to the number of counterclockwise hops corresponding to the request, it is determined to transmit the transmission data in the counterclockwise direction.
  • the transmission direction determination unit 124 When the hop count table 125 stores the minimum number of hops of 1, When the number of hops corresponding to the request is the minimum number of hops, the transmission data is determined to be transmitted in the direction corresponding to the minimum number of hops. When the number of hops corresponding to the request is not the minimum number of hops, the number of hops corresponding to the direction opposite to the direction corresponding to the minimum number of hops corresponds to the request stored in the hop number table 125. When the number of hops corresponding to the reverse direction is the smallest, it is determined to transmit the transmission data in the reverse direction. Otherwise, decide not to send the transmitted data.
  • Embodiment 1 *** Explanation of the effect of Embodiment 1 *** As described above, according to the present embodiment, by executing the procedure A and the procedure B, when there are a plurality of redundant network devices in the ring network, the transmission data is made redundant and the same route is used. It is possible to prevent the same data from flowing multiple times. Therefore, according to the present embodiment, in the ring network, it is possible to make the network device that performs data transfer redundant without increasing the bandwidth.
  • the redundant network device may receive a hop count table created by another redundant network device and use the received hop count table.
  • at least one redundant network device constituting the ring network creates a hop number table and transmits the created hop number table to another redundant network device.
  • the redundant network device includes procedure A and procedure B when a new redundant network device or network device joins the ring network, or when the redundant network device or network device constituting the ring network leaves the ring network. May be executed. According to this modification, when the configuration of the ring network is changed, the redundant network device holds a hop number table and a transmission direction table corresponding to the changed ring network.
  • each function of the redundant network device is realized by software has been described.
  • each of the above functions may be realized by hardware.
  • the redundant network device includes an electronic circuit (processing circuit) instead of the processor 11.
  • the redundant network device includes an electronic circuit instead of the processor 11 and the memory 12.
  • the electronic circuit is a dedicated electronic circuit that realizes each of the above functions (and the memory 12).
  • the electronic circuit is assumed to be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, a logic IC, a GA (Gate Array), an ASIC (Application Specific Integrated Circuit), or an FPGA (Field-Programmable Gate Array). To.
  • Each of the above functions may be realized by one electronic circuit, or each of the above functions may be distributed and realized in a plurality of electronic circuits.
  • processing circuit Lee The above-mentioned processor 11, memory 12, and electronic circuit are collectively referred to as "processing circuit Lee". That is, each of the above functions is realized by the processing circuit.
  • the redundant network device corresponds to a case where the information transmission source cannot transmit transmission data to the redundant network device due to some kind of communication failure between the information transmission source and the redundant network device. To do.
  • FIG. 8 is a configuration example of a transmission path redundancy system including the redundant network devices 31 to 33 according to the present embodiment.
  • the ring network in this figure is composed of redundant network devices 31 to 33 and network devices 41 to 44.
  • the redundant network devices 31 to 33 are connected to the information source 51.
  • This figure shows a situation in which the information transmission source 51 cannot transmit transmission data to the redundant network device 31 due to some kind of communication failure between the information transmission source 51 and the redundant network device 31.
  • FIG. 9 is an example of a configuration diagram of the redundant network device 31 according to the present embodiment.
  • the redundant network device 31 includes a failure detection unit 113.
  • the failure detection unit 113 detects that the communication between the redundant network device 31 and the information transmission source 51 is unexpectedly interrupted.
  • the fault detection unit 113 detects a fault in which an information source outside the ring network that can send a request to send transmission data to the destination network device cannot send the transmission data to the redundant network device. ..
  • the communication path redundancy unit 120 includes a failure detection transmission / reception unit 127 and a hop number table update unit 128.
  • the fault detection transmission / reception unit 127 When the failure detection unit 113 detects a failure, the information source 51 transmits a message including the fact that the transmission data cannot be transmitted to the redundant network device 31 to the hop number table update unit 128 and the other redundant network device. , It is a message transmitted by the failure detection transmission / reception unit 127 of another redundant network device, and receives a message similar to the above message. A message including the fact that the information transmission source cannot transmit the transmission data to the redundant network device is called a failure detection message.
  • the failure detection message includes information on a pair of an information source and a redundant network device corresponding to a communication failure.
  • the fault detection transmission / reception unit 127 When the failure detection unit 113 detects a failure, a failure detection message including information on the redundant network device corresponding to the failure is transmitted. Receive a failure detection message from another redundant network device.
  • the hop number table update unit 128 updates the hop number table 125 based on the information transmitted by the failure detection transmission / reception unit 127.
  • the hop number table update unit 128 determines the number of clockwise hops corresponding to the redundant network device corresponding to the failure detection message and the counterclockwise rotation from the hop number table 125. Delete the number of hops.
  • the hardware configuration of the redundant network device 31 in the present embodiment is the same as that shown in the first embodiment.
  • the redundant network device of the embodiment according to the present embodiment executes the procedure C and the procedure D.
  • procedure C when some kind of communication failure occurs between the redundant network device and the information source and the transmission data cannot be transmitted from the information source to the redundant network device, the failure detection message is sent to another redundant network device. Includes processing to send to.
  • Procedure D includes a process of updating the hop number table 125 when a failure detection message is received from another redundant network device, and updating the transmission direction table 126 based on the updated hop number table 125.
  • FIG. 10 is an example of a flowchart showing the operation of procedure C. The order of processing shown in this flowchart may be changed as appropriate.
  • the procedure C executed by the redundant network device 31 when some kind of communication failure occurs between the redundant network device 31 and the information transmission source 51 will be described with reference to the flowchart of FIG. To do.
  • Step S21 Failure notification processing
  • the failure detection transmission / reception unit 127 causes the communication failure between the hop count table update unit and the other redundant network device. Send a fault detection message corresponding to.
  • the failure detection transmission / reception unit 127 has the redundant network device 32 and the redundant network. A failure detection message is transmitted to the device 33 informing that a failure has occurred.
  • FIG. 11 is an example of a flowchart showing the operation of procedure D.
  • the order of processing shown in this flowchart may be changed as appropriate.
  • the procedure D executed by the redundant network device 32 when a failure occurs between the redundant network device 31 and the information transmission source 51 will be described with reference to the flowchart of FIG. Further, in the present description, as the code of each part constituting the redundant network device 32, the code of each part constituting the redundant network device 31 is used.
  • Step S22 Failure detection message reception process
  • the failure detection transmission / reception unit 127 receives the failure detection message transmitted by the procedure C.
  • the failure detection transmission / reception unit 127 receives the failure detection message transmitted by the redundant network device 31.
  • Step S23 Hop number table update process
  • the hop number table update unit 128 deletes the information existing in the hop number table 125 and corresponding to the redundant network device that is the source of the failure detection message.
  • the hop number table update unit 128 of the redundant network device 32 deletes the hop number information of the redundant network device 31 in the hop number table 125.
  • FIG. 15 is an example of the hop number table 125 before the update
  • FIG. 16 is an example of the hop number table 125 after the update.
  • the transmission direction determination unit 124 recreates the transmission direction table 126 by the processing of steps S5 to S15 based on the updated hop number table 125.
  • Embodiment 2 *** Explanation of the effect of Embodiment 2 *** As described above, according to the present embodiment, even if the redundant network device executes the procedure C and the procedure D, the communication between the redundant network device and the information transmission source is interrupted. It is possible to maintain the redundancy of the transmitted data while preventing the same data from flowing in one path.
  • the failure detection transmission / reception unit 127 does not have to transmit the failure detection message to the hop number table update unit 128.
  • the hop number table update unit 128 of the redundant network device corresponding to the failure detection unit 113 does not update the hop number table 125.
  • the hop number table update unit 128 may update the hop number table 125 when the communication failure is resolved.
  • the failure detection unit 113 detects that the communication failure has been resolved, and determines that the communication failure has been resolved.
  • the failure detection transmission / reception unit 127 transmits a failure resolution message including the fact that the communication failure has been resolved to the hop count table update unit 128 and the other redundant network device.
  • the hop number survey unit 121 investigates the number of bidirectional hops to each network device,
  • the hop number transmission / reception unit 122 transmits information on the number of bidirectional hops investigated by the hop number investigation unit 121 to the hop number table creation unit 123 and other redundant network devices.
  • the hop count table update unit 128 of the other redundant network device is information on the bidirectional hop number of the redundant network device corresponding to the failure resolution message, and is the hop count of the other redundant network device.
  • the bidirectional hop number received by the transmission / reception unit 122.
  • the transmission direction determination unit 124 of the other redundant network device recreates the transmission direction table 126 by the processing of steps S5 to S15 based on the updated hop number table 125.
  • the embodiment is not limited to the one shown in the first and second embodiments, and various changes can be made as needed.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

La présente invention concerne un dispositif de réseau redondant (31), qui constitue un réseau en anneau comprenant une pluralité de dispositifs de réseau redondants (31), comprenant : une table de nombre de sauts (125) qui stocke les nombres de sauts dans le sens des aiguilles d'une montre dont chacun correspond à une demande de transmission de données de transmission à un dispositif de réseau de destination de transmission constituant le réseau en anneau, et qui correspondent respectivement à la pluralité de dispositifs de réseau redondants; et une unité de détermination de direction de transmission (124) qui, lorsque le nombre de sauts dans le sens des aiguilles d'une montre correspondant au dispositif lui-même est minimal parmi les nombres de sauts dans le sens des aiguilles d'une montre stockés dans le tableau de nombres de sauts (125) et correspondant chacun à la demande, détermine de transmettre des données de transmission dans le sens des aiguilles d'une montre.
PCT/JP2019/021768 2019-05-31 2019-05-31 Dispositif de réseau redondant, procédé de réseau redondant, programme de réseau redondant et système de redondance de trajet de transmission WO2020240833A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009016905A (ja) * 2007-06-29 2009-01-22 Fujitsu Ltd パケットネットワークシステム
JP2009017230A (ja) * 2007-07-04 2009-01-22 Nec Corp 通信システム、冗長化ノードおよび冗長化ノード用プログラム
JP2009118472A (ja) * 2007-10-17 2009-05-28 Yokogawa Electric Corp Ｉｐネットワークシステム
JP2012161026A (ja) * 2011-02-02 2012-08-23 Hitachi Cable Ltd フレーム中継装置、フレーム中継方法、リング型ネットワークシステム、及び、スーパーリング型ネットワークシステム
US20180145850A1 (en) * 2016-11-23 2018-05-24 DeGirum Corporation Permutated Ring Network

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009016905A (ja) * 2007-06-29 2009-01-22 Fujitsu Ltd パケットネットワークシステム
JP2009017230A (ja) * 2007-07-04 2009-01-22 Nec Corp 通信システム、冗長化ノードおよび冗長化ノード用プログラム
JP2009118472A (ja) * 2007-10-17 2009-05-28 Yokogawa Electric Corp Ｉｐネットワークシステム
JP2012161026A (ja) * 2011-02-02 2012-08-23 Hitachi Cable Ltd フレーム中継装置、フレーム中継方法、リング型ネットワークシステム、及び、スーパーリング型ネットワークシステム
US20180145850A1 (en) * 2016-11-23 2018-05-24 DeGirum Corporation Permutated Ring Network

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