WO2016080065A1 - Dispositif de communication, procédé et programme de détermination de mauvaise connexion - Google Patents

Dispositif de communication, procédé et programme de détermination de mauvaise connexion Download PDF

Info

Publication number
WO2016080065A1
WO2016080065A1 PCT/JP2015/076449 JP2015076449W WO2016080065A1 WO 2016080065 A1 WO2016080065 A1 WO 2016080065A1 JP 2015076449 W JP2015076449 W JP 2015076449W WO 2016080065 A1 WO2016080065 A1 WO 2016080065A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
communication device
communication
light emitting
ports
Prior art date
Application number
PCT/JP2015/076449
Other languages
English (en)
Japanese (ja)
Inventor
廣明 片岡
Original Assignee
日本電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電気株式会社 filed Critical 日本電気株式会社
Publication of WO2016080065A1 publication Critical patent/WO2016080065A1/fr

Links

Images

Classifications

    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection

Definitions

  • the present invention relates to a communication device connected to another device via a network cable, an erroneous connection determination method, and a program for causing a computer to execute the method.
  • Non-Patent Documents 1 and 2). reference Non-Patent Documents 1 and 2.
  • Ethernet registered trademark
  • OAM Operations, Administration and Maintenance
  • ETH-CC Continuousity Check
  • CCM Continuousity Check
  • FIG. 1A and FIG. 1B are diagrams showing a frame configuration defined in Non-Patent Document 1.
  • FIG. 1A shows the format of CCM PDU (Protocol Data) Unit), and
  • FIG. 1B shows the format of Flags shown in FIG. 1A.
  • the CCM frame includes an MEG ID for identifying a MEG (Maintenance Entity Group), a MEP ID for identifying a MEP (Maintenance group End Point), It includes MEL (MEG Level) indicating the management level of the group targeted by the frame, and Flags information.
  • MEG ID for identifying a MEG (Maintenance Entity Group)
  • MEP ID for identifying a MEP (Maintenance group End Point)
  • MEL MEG Level
  • Flags includes Period, which is information indicating the transmission period of the own frame. Examples of techniques using CCM frames are disclosed in Patent Documents 1 and 2.
  • Non-Patent Document 2 defines LLDP (Link Layer Discovery Protocol) for the purpose of managing communication devices and terminals connected to a communication network.
  • LLDP is a layer 2 level protocol for notifying neighboring devices of information such as the type of device and setting values between devices.
  • the format of the LLDP frame transmitted / received between devices is shown in FIG.
  • Patent Document 3 discloses an example of a method for detecting an erroneous connection at a layer 2 level using a MAC (Media Access Control) address learning function. Further, in Patent Document 4, when an operator connects a cable to a router device, if the cable is connected to an incorrect port, the setting contents in the own device can be changed so that the router device becomes a normal connection. It is disclosed.
  • MAC Media Access Control
  • the operator When performing network construction such as cable replacement or new installation, the operator needs to check whether the communication device is normally connected via the communication network. In the situation where the configuration (setting) of each communication device is properly implemented, an operator may mistakenly connect a cable during network construction. In this case, an operator cannot check the cable connection state unless an information processing terminal for monitoring is connected to a host system such as an NMS (Network Management System) that manages communication devices of a communication network. There was a problem that it took a long time to check the connection. Even if the operator connects the information processing terminal to the host system and overlooks the wrong cable connection, the host system must be checked to make sure that the communication device settings are correct in order to make the cable connection normal. Needs to be reviewed. As a result, the progress of network construction is further delayed.
  • NMS Network Management System
  • One of the objects of the present invention is to provide a communication device, an erroneous connection determination method, and a program that make it easy to visually recognize whether there is an erroneous connection at the L2 level.
  • a communication device includes a plurality of ports to which a cable for communicating with an opposite device is connected, a light emitting unit for notifying an operator whether or not there is a misconnection of the cable, and a plurality of ports
  • a communication processing unit that transmits and receives a communication frame for determining whether or not the connection is good at the data link layer level with the opposite device via the cable at a certain period; Referring to the pre-registered setting value and the communication frame received from the opposite device, it is determined whether there is an erroneous connection with the opposite device at the data link layer level.
  • a connectivity verification unit to be lit.
  • An erroneous connection determination method includes a plurality of ports to which a cable for communicating with an opposite device is connected, and a light emitting unit for notifying an operator of whether there is an erroneous connection of the cable.
  • a program provides a computer having a plurality of ports to which a cable for communicating with an opposite device is connected, and a light emitting unit for notifying an operator of whether or not there is a misconnection of the cable.
  • FIG. 1A is a diagram illustrating a configuration of a frame defined in Non-Patent Document 1.
  • FIG. 1B is a diagram showing a configuration of a part of the frame shown in FIG. 1A.
  • FIG. 2 is a diagram illustrating a frame configuration defined in Non-Patent Document 2.
  • FIG. 3 is a block diagram showing a configuration example of the communication apparatus according to the present embodiment.
  • FIG. 4 is a flowchart showing an operation procedure by the communication apparatus of the present embodiment.
  • FIG. 5 is a diagram for explaining Example 1 of the erroneous connection determination method of the present embodiment.
  • FIG. 6 is a diagram for explaining Example 2 of the erroneous connection determination method of the present embodiment.
  • FIG. 7 is a block diagram showing another configuration example of the communication apparatus of this embodiment.
  • the communication device is a network communication device including a switching hub and a router, for example.
  • FIG. 3 is a block diagram illustrating a configuration example of the communication apparatus according to the present embodiment.
  • FIG. 3 shows a configuration in which the communication device 10a and the communication device 10b of this embodiment are connected by a cable.
  • the communication device 10a is connected to the host system 51, and the communication device 10b is connected to the host system 52.
  • the host systems 51 and 52 are, for example, NMS (Network Management System).
  • NMS Network Management System
  • network construction is performed between the communication device 10a and the communication device 10b, and it is determined whether or not the cable between these communication devices is correctly connected.
  • FIG. 3 shows a configuration in which the communication device 10a and the communication device 10b are connected by peer-to-peer, but a relay device may be connected between these communication devices.
  • a relay device may be connected between these communication devices.
  • FIG. 3 shows a case in which no relay device is connected between the communication device 10 a and the communication device 10 b.
  • ETH-CC defined in Non-Patent Document 1 is used for correct / incorrect determination of cable connection.
  • FIG. 3 shows a case where two pairs of twisted pair cables are connected between the communication device 10a and the communication device 10b.
  • the number of twisted pair cables is not limited to two. Since the communication device 10a and the communication device 10b have the same configuration, the configuration of the communication device 10a will be described in detail below, and the description of the communication device 10b will be omitted.
  • the communication device 10a includes an OAM processing unit 21-1a to 21-2a, a connectivity verification unit 22a, ports 24-1a to 24-2a, and an LED (Light Emitting Diode) 23-1a. 23-2a.
  • the OAM processing units 21-1a to 21-2a function as communication processing units that transmit and receive ETH-CC to the communication device 10b.
  • the OAM processing units 21-1a to 21-2a analyze the ETH-CC received from the communication device 10b, read line information including the MEG ID and MEP ID from the ETH-CC, and notify the connectivity verification unit 22a. Further, the OAM processing units 21-1a to 21-2a generate ETH-CC according to the setting value of the communication device 10a, and send the ETC-CC to the communication device 10b via the ports 24-1a to 24-2a and the cable. Send.
  • the line information includes MEL, MEG ID, MEP ID, and Period.
  • the connectivity verification unit 22a has a memory (not shown) in which the setting value of the communication device 10a is registered in advance.
  • the set value includes values of parameters such as MEL, MEG ID, and MEP ID in the format shown in FIG. 6 corresponding to each port.
  • the set value includes not only the own device but also the parameters of the opposite device. For example, corresponding to each port of the communication device 10a, the MEP ID of the port connected to the communication device 10b side is registered in the setting value on the communication device 10a side.
  • expected value the parameter on the opposite device side registered in the setting value of the own device.
  • the connectivity verification unit 22a determines whether or not an ETH-CC failure has occurred by referring to the line information notified from the OAM processing units 21-1a to 21-2a and the setting value registered in advance. To do. When the connectivity verification unit 22a detects an ETH-CC failure, the connectivity verification unit 22a identifies the correct connection destination from the setting value of the communication device 10a, and instructs the LED corresponding to the identified port to turn on. When the connectivity verification unit 22a recognizes that the ETH-CC failure has been resolved from the line information notified from the OAM processing units 21-1a to 21-2a, it instructs the LED that has been instructed to turn off. In addition, the connectivity verification unit 22a notifies the upper system 51 of the normality of the connection based on the notified line information.
  • the configuration of the connectivity verification unit 22a is preferably a dedicated circuit including an ASIC (Application Specific Specific Integrated Circuit). However, a CPU (Central Processing Unit) that executes processing according to a program is provided, and the CPU has the above functions. May be executed.
  • ASIC Application Specific Specific Integrated Circuit
  • CPU Central Processing Unit
  • the LEDs 23-1a to 23-2a are provided corresponding to the ports 24-1a to 24-2a of the communication device 10a.
  • FIG. 3 shows a case where the number of ports is two for ease of explanation, as described above, three or more ports may be provided.
  • the LEDs 23-1a to 23-2a are turned on or off according to an instruction from the connectivity verification unit 22a.
  • the LEDs 23-1a to 23-2a are provided separately from link LEDs (not shown) for displaying the correctness of physical connection.
  • the LEDs 23-1a to 23-2a be arranged at positions that are easy for the operator to see. For example, if the LEDs 23-1a to 23-2a are arranged on the front side of the communication device, the operator recognizes whether or not there is an incorrect connection of the cable and the position of the correct connection destination port when there is an incorrect connection. There is an advantage that it becomes easy to do.
  • this LED since the LED that is lit serves to guide the worker to the correct connection destination of the cable, this LED is hereinafter referred to as a guidance LED.
  • the communication device 10b corresponds to the opposite device of the communication device 10a.
  • the communication device 10a corresponds to the opposite device of the communication device 10b.
  • the OAM processing unit reads the line information from the communication frame and notifies the connectivity verification unit.
  • the OAM processing unit transfers the received communication frame to the connectivity verification unit, and the connectivity verification unit performs communication.
  • the line information may be read from the frame.
  • the line information referred to by the connectivity verification unit for determination of erroneous connection is MEL, MEG ID, MEP ID, and Period
  • a memory (not shown) may be provided in the OAM processing unit, and the setting value of the own device may be stored in the memory in advance, and instead of providing the memory in the OAM processing unit, the OAM processing unit is connected to the connectivity verification unit. The set value may be read out.
  • FIG. 4 is a flowchart showing an operation procedure by the communication apparatus of the present embodiment.
  • FIG. 5 is a diagram showing a specific example of the erroneous connection determination method of the present embodiment.
  • the communication device 10a transmits / receives the CCM shown in FIG. 6 to the communication device 10b at a constant cycle.
  • the communication device 10a determines whether the values of the four parameters MEL, MEG ID, MEP ID, and Period described in the CCM match the expected value of the own device. To check the normality of the connection.
  • the communication device 10a determines that an ETH-CC failure has occurred (step 1002), and the above 4 included in the received CCM. Ports with the same value of the two parameters are searched with the set value (step 1003). As a result of the search, if there is another port having the same value of the four parameters as a result of the search, the communication device 10a identifies the port to be connected. The communication device 10a turns on the LED corresponding to the identified port as the guidance LED (step 1004).
  • the communication device 10a determines that the ETH-CC failure has been canceled as a result of the determination in step 1002 (step 1005), and turns off the guidance LED (step 1006). ).
  • the first embodiment is a case where the communication device 10a and the communication device 10b are connected by peer-to-peer.
  • the second embodiment is a case where a relay device is connected between the communication device 10a and the communication device 10b.
  • FIG. 5 shows a case where the port 24-1a of the communication device 10a is to be connected to the port 24-2b of the communication device 10b via a cable, but the port 24-1a and the port 24-1b are erroneously connected. .
  • the communication device 10a sends a CCM including line information of “MEL: 5, MEG ID: GRP1, MEP ID: 210 and Period: 3.3ms” via the port 24-1a. Send to.
  • the communication device 10b When the communication device 10b receives the CCM from the communication device 10a via the port 24-1b, the communication device 10b reads the values of the parameters of MEL, MEG ⁇ ID, MEP ID, and Period from the received CCM. Then, the connectivity verification unit 22b of the communication device 10b detects an ETH-CC failure because the MEPCMID of the received CCM is different from the expected MEP ID set in the port 24-1b. Subsequently, the connectivity verification unit 22b estimates that the port to receive the CCM received via the port 24-1b from the set value of the port 24-2b is the port 24-2b, and corresponds to the port 24-2b. The LED 23-2b to be turned on is turned on as an induction LED.
  • FIG. 6 shows a configuration example when the relay device 30 is connected between the communication device 10a and the communication device 10b.
  • the communication device 10b shown in FIG. 6 has ports 24-1b to 24-3b, and LEDs 23-1b to 23-3b corresponding to these ports.
  • FIG. 6 a part of the configuration shown in FIG. 3 including the LEDs 23-1b to 23-2b is not shown in the drawing.
  • a thick solid line connecting the connectivity verification units 22a and 22b schematically represents whether or not the connection is normal.
  • FIG. 6 shows a case where the port 24-2a of the communication device 10a should be connected to the port 24-3b of the communication device 10b, but the port 24-2a is erroneously connected to the port 24-2b.
  • the communication devices 10a and 10b determine whether or not the connection is correct using the MEP ID.
  • the communication device 10a transmits a CCM including information of MEP ID: 200 to the communication device 10b via the port 24-1a, and transmits a CCM including information of MEPMID: 400 to the communication device 10b via the port 24-2a. Send.
  • the relay device 30 receives the CCM from the communication device 10a, the relay device 30 refers to the MEP ID of the CCM to identify the destination communication device 10b and transfers the CCM to the communication device 10b.
  • the communication device 10b When the communication device 10b receives the CCM from the communication device 10a via the port 24-1b, the communication device 10b reads the MEP ID from the received CCM. Then, the connectivity verification unit 22b of the communication device 10b determines that the connection is normal when the MEPCMID of the received CCM matches the expected MEP ID set in the port 24-1b.
  • the communication device 10b when the communication device 10b receives the CCM from the communication device 10a via the port 24-2b, the communication device 10b reads the MEP ID from the received CCM. Then, the connectivity verification unit 22b detects an ETH-CC failure because the MEPCMID of the received CCM is different from the expected MEP ID set in the port 24-2b. In this case, the connectivity verification unit 22b refers to the setting value of the port 24-3b to estimate that the port that should receive the CCM received via the port 24-2b is the port 24-3b.
  • the LED 23-3b corresponding to 24-3b is turned on as an induction LED.
  • an erroneous cable connection is detected at the time of network construction, and there is an erroneous cable connection at the L2 level.
  • the operator can be notified quickly by lighting. The operator does not need to check the network state by connecting the information processing terminal to the host system, and can quickly recognize erroneous connection of the cable at the L2 level.
  • the communication device can identify the port to be connected based on the ETH-CC line information received from the opposite device. Therefore, the communication device can indicate the correct port of the cable connection destination to the operator by turning on the guidance LED of the specified port.
  • the induction LED can reduce the time required to reconnect the cable from the wrong connection state to the correct port.
  • Non-Patent Document 2 LLDP defined in Non-Patent Document 2 is used instead of ETH-CC.
  • the configuration of the communication device in this modification will be described with reference to FIG. A detailed description of the same configuration as that described with reference to FIG. 3 is omitted.
  • the OAM processing unit illustrated in FIG. 3 is referred to as a communication processing unit.
  • Port ID TLV is an identifier for specifying a transmission source port of the LLDP frame. That is, the port identifier corresponding to the port of the communication device 10a is set as an expected value from which port of the communication device 10b the LLDP frame is transmitted.
  • the communication processing unit of the communication device 10a detects the communication device 10b as an adjacent node and transmits / receives an LLDP frame to / from the communication device 10b. Subsequently, the connectivity verification unit 22a compares the Port ID TLV of the LLDP frame received from the communication device 10b with a preset expected value, and determines whether the Port ⁇ ⁇ ⁇ ⁇ ID TLV of the frame matches the expected value. judge. If the connectivity verification unit 22a determines that the transmission source of the frame does not match the expected value, the connectivity verification unit 22a searches the expected value that matches the received PortPID TLV with the expected value set for each port, and guides the matching port. The LED is turned on as a port.
  • This modification is not limited to the case where the communication device 10a and the communication device 10b are connected by peer-to-peer, and a relay device may be connected between these communication devices.
  • the relay device may read the identifier of the destination device with reference to the LLDP frame and transfer the LLDP frame to the device specified by the identifier.
  • the line information is transmitted using the original frame format, the OAM extension, and the LLDP extension without using these frames. You may exchange between.
  • a common policy is determined in advance between the own device and the opposite device, such as selecting the port with the smallest MEP ID, and the communication device follows the common policy.
  • One representative port may be selected and the corresponding LED may be turned on as a guide LED.
  • ETH-CC failure it is possible to prevent the occurrence of ETH-CC failure in advance.
  • An example of the method will be described. Assume that an operator connects at least one cable between communication devices, and there are a plurality of ports that are port-enabled and not connected to a cable when no ETH-CC failure is detected. At this time, the connectivity verification unit of one communication device selects one port to which the next cable is connected from the plurality of ports, and transmits the line information of the selected port to the opposite device via the connected cable. In addition to transmitting, the LED of the selected port is turned on. The opposite device turns on the LED of the port corresponding to the received line information as a guide LED. In this way, it is possible to guide the correct cable connection to the operator by lighting the guidance LEDs of the own device and the opposite device in pairs.
  • FIG. 7 is a block diagram showing another configuration example of the communication apparatus of this embodiment.
  • the connectivity verification detects an erroneous connection at the data link layer level
  • the LED 25 shown in FIG. 7 is turned on. According to this configuration, the operator can not only quickly recognize the presence or absence of cable misconnection, but also can reduce the manufacturing cost of the communication device.
  • an existing link LED (not shown) may be operated as the induction LED.
  • the link LED blinks, but when the link LED blinks as an inductive LED, the connectivity verification unit of the communication device has a blinking cycle when there is a problem with the physical connection.
  • the emission color may be different between when there is a problem in physical connection and when there is an erroneous connection at the data link layer level. For example, when there is a problem with the physical connection, the connectivity verification unit of the communication apparatus blinks the link LED in green, and when there is an erroneous connection at the data link layer level, blinks the link LED in orange.
  • the device that executes the erroneous connection determination method of the present embodiment is not limited to a communication device, and may be a computer having a memory that stores a program and a CPU that executes processing according to the program.
  • the method of the present invention can be executed by the computer.
  • a program describing the procedure of the erroneous connection determination method described above may be stored in a computer-readable recording medium.
  • the other information processing apparatus it is possible to cause the other information processing apparatus to execute the above-described erroneous connection determination method by installing the program from the recording medium to the other information processing apparatus.
  • the communication devices when the communication devices are connected with a cable, if the cable is erroneously connected at the L2 level, the operator can immediately recognize that there is an erroneous connection.

Landscapes

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

Abstract

Le dispositif de communication (10a) d'après la présente invention comprend : une pluralité de ports (24-1a, 24-2a) auxquels sont connectés des câbles permettant de communiquer avec un dispositif partenaire (10b) ; une unité d'émission de lumière (23-1a) conçue pour notifier à un utilisateur s'il existe ou non une mauvaise connexion parmi les câbles ; une unité de traitement de communication (21-1a) qui, lorsqu'un câble est connecté à au moins un port parmi la pluralité de ports, transmet/reçoit une trame de communication de façon à déterminer à intervalles réguliers si une connexion au niveau d'une couche de liaison de données est satisfaisante à destination/en provenance du dispositif partenaire (10b) par l'intermédiaire du câble ; et une unité de vérification de connectivité (22a) qui, en référence à une valeur de consigne préenregistrée et à la trame de communication reçue du dispositif partenaire, détermine s'il y a une mauvaise connexion au dispositif partenaire (10b) au niveau de la couche de liaison de données et, si tel est le cas, active l'unité d'émission de lumière (23-1a).
PCT/JP2015/076449 2014-11-17 2015-09-17 Dispositif de communication, procédé et programme de détermination de mauvaise connexion WO2016080065A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-232362 2014-11-17
JP2014232362 2014-11-17

Publications (1)

Publication Number Publication Date
WO2016080065A1 true WO2016080065A1 (fr) 2016-05-26

Family

ID=56013625

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/076449 WO2016080065A1 (fr) 2014-11-17 2015-09-17 Dispositif de communication, procédé et programme de détermination de mauvaise connexion

Country Status (1)

Country Link
WO (1) WO2016080065A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020005206A (ja) * 2018-06-29 2020-01-09 富士通株式会社 ネットワーク装置、結線確認方法及び結線確認プログラム

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011244127A (ja) * 2010-05-17 2011-12-01 Fujitsu Frontech Ltd 通信装置、および通信プログラム
JP2012074879A (ja) * 2010-09-28 2012-04-12 Hitachi Ltd ケーブルの誤接続をチェックする計算機システム、装置及び方法
JP2013005123A (ja) * 2011-06-15 2013-01-07 Nec Corp 通信装置、ネットワーク及びそれらに用いる通信方法
JP2014064220A (ja) * 2012-09-24 2014-04-10 Alaxala Networks Corp ネットワーク装置及びネットワークシステム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011244127A (ja) * 2010-05-17 2011-12-01 Fujitsu Frontech Ltd 通信装置、および通信プログラム
JP2012074879A (ja) * 2010-09-28 2012-04-12 Hitachi Ltd ケーブルの誤接続をチェックする計算機システム、装置及び方法
JP2013005123A (ja) * 2011-06-15 2013-01-07 Nec Corp 通信装置、ネットワーク及びそれらに用いる通信方法
JP2014064220A (ja) * 2012-09-24 2014-04-10 Alaxala Networks Corp ネットワーク装置及びネットワークシステム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020005206A (ja) * 2018-06-29 2020-01-09 富士通株式会社 ネットワーク装置、結線確認方法及び結線確認プログラム
JP7210914B2 (ja) 2018-06-29 2023-01-24 富士通株式会社 ネットワーク装置、結線確認方法及び結線確認プログラム

Similar Documents

Publication Publication Date Title
JP5776618B2 (ja) ネットワークスイッチ
CN102783095B (zh) 通信系统、通信方法、服务器设备、通信设备
CN105340230A (zh) 虚拟机架拓扑管理
CN106452921B (zh) 一种堆叠系统分裂检测方法及装置
CN104601394A (zh) 一种业务链连通性检测的方法、装置及系统
CN104243239A (zh) 一种sdn集群中控制器的状态检测方法和装置
CN104079462A (zh) 环网配置检测方法及装置
US20150236920A1 (en) Method and apparatus for determining connection information of a link
CN103905274A (zh) 一种故障信息的传递方法和设备
CN103490951A (zh) 基于bfd的多跳链路中双向转发检测方法
US9473384B2 (en) Validating reachability of nodes of a network of an industrial automation and control system
US9692636B2 (en) Relay system and relay device
US9893979B2 (en) Network topology discovery by resolving loops
CN110620693A (zh) 一种基于物联网的铁路沿线车站路由远程重启控制系统及方法
CN107026780A (zh) 一种基于物联网的配电光纤环网故障点定位方法及系统
US20190132261A1 (en) Link locking in ethernet networks
WO2016080065A1 (fr) Dispositif de communication, procédé et programme de détermination de mauvaise connexion
WO2016015606A1 (fr) Procédé de localisation d'erreur de connexion de port et dispositif associé
EP2840738B1 (fr) Procédé de configuration mep et dispositif de réseau
US9225667B2 (en) Communication system and network relay apparatus
US10148515B2 (en) Determining connections of non-external network facing ports
CN115549775B (zh) 光信号传输异常的处理方法、光传输设备及系统
US9667439B2 (en) Determining connections between disconnected partial trees
JP7236750B2 (ja) 設備を監視するための方法
JP6359914B2 (ja) 中継システムおよび中継装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15861081

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15861081

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP