JP2014165577A - Network system, terminal device, management device, and network monitoring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network system capable of mitigating a processing load of a communication device and performing failure detection, without implementing a specific protocol.SOLUTION: A network system comprises: a management server; a plurality of communication devices whose communication path is set by the management server; and a user terminal connected to the communication device. A user terminal 1-1 connected to one communication device of the communication devices comprises: a communication interface unit 11 for performing communication with an opposing user terminal connected to another communication device; a failure detection unit 121 for detecting a failure in a communication path with the opposing user terminal on the basis of the presence/absence of an answer from the opposite user terminal; and a failure occurrence notification unit 122 for transmitting failure occurrence notification including failure information for identifying a communication path in which a failure is detected in the case where the failure is detected, to the management server.

Description

  The present invention relates to a network system, a terminal device, a management device, and a network monitoring method.

  The centralized control network has a feature that the communication path can be controlled by centrally managing the network by the management server, and the management of the communication path and the failure detection are easy.

  Therefore, various efforts have been made to detect failures, and OpenFlow, which is a network control technology for a centralized control network, manages the number of packets and the number of data bytes as statistical information, thereby reducing communication failures and communication quality. Is used (see, for example, Non-Patent Document 1).

  In addition, when a point multipoint connection is established, the maintenance device that manages the transmission side node instructs the transmission side node to transmit the test cell, and the reception side node instructs the maintenance device of the reception side node. It is disclosed to perform a connection justification test by receiving a test cell, verifying the cell, and notifying the verification result to the maintenance device of the receiving node (for example, Patent Document 1). reference).

  Further, for example, Patent Literature 2 discloses a technique in which a communication device independently changes a route instead of a centralized control network. In the technique described in Patent Document 2, the packet transfer device includes a transmission device that transmits data, a router unit for packet transfer, and a monitoring unit that monitors whether a transmission path failure has occurred in the transmission device, By immediately reflecting the failure occurrence information from the monitoring unit in the routing table in the router unit, the route setting is changed at high speed.

  In the technique described in Patent Document 3 below, when duplexing a communication line, communication line switching devices are arranged at both ends of a section to be duplexed, and the communication line switching device is operated based on a master-slave system. Then, the communication state of the constant communication system is monitored on the master side, the switching of the communication line is controlled in response to the detection of the occurrence of the failure, and the switching instruction to the communication line switching device on the slave side is given, so that the backup communication system Switch to.

Japanese Patent Laid-Open No. 9-326795 JP 2002-9881 A Japanese Patent Laid-Open No. 2002-247017

Open Network Foundation, OpenFlow Switch Specification Version 1.0.0, 2009/12/31

  However, in the technique of Non-Patent Document 1, the management server collects statistical information such as the number of packets and the number of data bytes stored in the communication device, thereby comparing the statistical information between adjacent communication devices. As a result, it is possible to detect communication failures and communication quality degradation, but as the number of communication devices increases, the workload of statistical information collection by the management server and statistical information comparison of each section, and until detection There is a problem that time increases.

  In the technique described in Patent Document 1, the maintenance device that manages the transmission side node instructs the transmission side node to transmit a test cell, and the reception side node receives the test cell according to the instruction from the maintenance device of the reception side node. Then, the cell is verified and the result is notified to the maintenance device of the receiving node. For this reason, it is possible to perform a connection justification test on an ATM (Asynchronous Transfer Mode) connection for one-way communication. However, since the communication device needs to verify the connection, the communication device is verified when the load is high. If this is done, data transfer may be affected. In addition, when a failure occurs in a node on the way to the receiving side node, the test cell is interrupted, so that there is a problem that verification at the receiving side node cannot be performed and the location of the failure cannot be specified. Furthermore, since it is necessary to transmit a test cell for the validity test of the communication path, there is a problem that the test cell increases with the increase of the test path, which may affect the network in operation.

  In the technique of Patent Document 2, the failure setting information from the monitoring unit can be quickly reflected by rewriting the routing table in the router unit and reflecting it immediately. However, since it is necessary to implement the same function in all of the transmission apparatuses, there is a problem that a network cannot be constructed unless the communication apparatuses have the same function.

  In the technique of Patent Document 3, the communication line switching devices arranged at both ends of the section to be duplexed operate in the master-slave system, monitor the communication state of the continuous communication system on the master side, and detect the occurrence of a failure. The communication line switching control is performed, and the switching instruction to the communication line switching device on the slave side is also performed. Therefore, it can be realized without the need for complicated wiring and expensive communication devices, but it is necessary to construct a network by always duplicating during operation, and a backup communication system cannot be used in normal times. For this reason, there exists a subject that the use efficiency of a network is low. Moreover, there is a problem that switching control cannot be performed when communication between the master and the slave is interrupted.

  The present invention has been made in view of the above, and can implement a network system, a terminal device, a management device, and a management device capable of reducing a processing load of a communication device and implementing failure detection without implementing a special protocol. The purpose is to obtain a network monitoring method.

  In order to solve the above-described problems and achieve the object, the present invention provides a network system including a management device, a plurality of communication devices whose communication paths are set by the management device, and a terminal device connected to the communication device. The first terminal device connected to the first communication device that is one of the communication devices is connected to the second communication device that is the communication device other than the first communication device. Of a communication path between the second terminal device and a communication processing unit that performs communication with the second terminal device and the presence / absence of a response from the second terminal device in the communication The failure detection unit that detects a failure, and the failure occurrence notification that stores failure information that is information for identifying a communication path in which a communication failure is detected when a communication failure is detected by the failure detection unit. Failure to send to the device Characterized in that it comprises a live notifying unit.

  According to the present invention, it is possible to reduce the processing load on the communication device and implement fault detection without implementing a special protocol.

FIG. 1 is a diagram illustrating a functional configuration example of a user terminal according to the first embodiment. FIG. 2 is a diagram illustrating a configuration example of the network system according to the first embodiment. FIG. 3 is a sequence diagram illustrating an example of an operation when a failure is detected according to the first embodiment. FIG. 4 is a diagram illustrating an example of a notification format such as a communication failure occurrence notification. FIG. 5 is a diagram illustrating a functional configuration example of the management server according to the second embodiment. FIG. 6 is a diagram illustrating an example of a transfer information entry of the communication device according to the second embodiment. FIG. 7 is a sequence diagram illustrating an example of a path setting operation after the occurrence of a failure according to the second embodiment. FIG. 8 is a diagram illustrating a functional configuration example of the communication apparatus according to the third embodiment. FIG. 9 is a sequence diagram illustrating an example of the failure location detection operation according to the third embodiment.

  Hereinafter, embodiments of a network system, a terminal device, a management device, and a network monitoring method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating a functional configuration example of a first embodiment of a user terminal (terminal device) according to the present invention. As illustrated in FIG. 1, the user terminal 1-1 according to the present embodiment includes a communication interface unit (communication processing unit) 11 that performs predetermined communication processing for performing communication with other communication devices and user terminals, and communication. And a communication state monitoring unit 12 that monitors the communication state with the opposite user terminal. The communication state monitoring unit 12 includes a failure detection unit 121 that detects a communication failure, a failure occurrence notification unit 122 that notifies the management server of the occurrence of a failure, and a base information collection unit 123. In the example of FIG. 1, the user terminal 1-1 is connected to the adjacent communication device 3-1, and is connected to the adjacent user terminal 1-2 in the base. In the present embodiment, the user terminal 1-1 may not include the base information collection unit 123.

  FIG. 2 is a diagram illustrating a configuration example of the network system according to the present embodiment. The network system of the present embodiment includes a management server (management device) 2, communication devices 3-1 to 3-8, and user terminals 1-1 and 5-1. The user terminal 1-1 exists in the base 4 and the user terminal 5-1 exists in the base 6.

  FIG. 3 is a sequence diagram illustrating an example of an operation when a failure is detected according to the present embodiment. The operation at the time of failure detection according to this embodiment will be described with reference to FIGS. Here, an example in which a failure occurs in the communication path between the user terminal 1-1 and the user terminal 5-1 when the user terminal 1-1 is communicating with the user terminal 5-1.

  The network system of the present embodiment is a centralized control network system such as SDN (Software Defined Networking), for example, a data transfer network (data plane), and connection type communication such as TCP (Transmission Control Protocol). It is assumed that it will be operated by. That is, when data communication is performed between user terminals, it is assumed that there is a response from the opposite user terminal for communication when packet reception is completed normally. In the present embodiment, any system that assumes that there is a response in communication between user terminals may be used, and the communication protocol of the network system is not limited to the above example.

  In the network system of the present embodiment, the communication path in the communication devices 3-1 to 3-8 is managed by the management server 2. When a failure occurs between the communication devices 3-1 to 3-8, a new communication path is set by the management server 2.

  As shown in FIG. 3, in the user terminal 1-1, the communication interface unit 11 transfers a packet addressed to the user terminal 5-1 (step S1). Here, it is assumed that a failure occurs on the communication path between the user terminal 1-1 and the user terminal 5-1, and there is no response from the user terminal 5-1.

  The failure detection unit 121 of the user terminal 1-1 monitors a response from the user terminal 1-2 via the communication interface unit 11, and determines that a communication failure has occurred (failure detection) when no response is received. (Step S2). Note that the failure detection unit 121 receives a response when, for example, a confirmation response message such as TCP is not received within a certain time from the opposite user terminal in communication or when a file acquisition from the opposite user terminal fails. Judge that there is no.

  The failure detection unit 121 of the user terminal 1-1 notifies the occurrence of a communication failure to the failure occurrence notification unit 122 (step S3). The failure notification unit 122 collects packet information of communication in which a failure has occurred (step S4), and notifies the management server 2 of the occurrence of a communication failure together with the collected packet information (step S5). As this packet information, the communication flow used in SDN / OpenFlow required for packet transmission, such as the destination and transmission source address, protocol, input / output port number, etc., used for determining the communication path in the management server 2 Definition information (transfer rules) that defines The packet information and the notification of the occurrence of the communication failure can be transmitted, for example, as a communication failure occurrence notification in the format shown at the bottom of FIG. FIG. 4 is a diagram illustrating an example of a notification format such as a communication failure occurrence notification. In FIG. 4, the control information is control information such as an address necessary for communication between the user terminal 1-1 and the management server 2 (header information of a communication protocol used between the user terminal 1-1 and the management server 2). Indicates. It is assumed that the control information includes identification information indicating the type of notification. For example, in the case of the communication failure occurrence notification at the bottom of FIG. 4, identification information indicating that the communication failure occurrence notification is included in the control information. The failure occurrence information in FIG. 4 is information including route identification information for identifying a route in which a communication failure has occurred, such as an address of a transmission source and an opposite user terminal that communicate with information indicating that a communication failure has occurred. . For example, by transmitting the control information and the failure occurrence information from the user terminal to the management server 2 in the format shown in the lowermost part of FIG. Can be acquired.

  The management server 2 identifies and grasps the location of the failure based on the failure occurrence information included in the communication failure occurrence notification from the user terminal 1-1. Note that the format of the notification is illustrated in FIG. 4 (the bottom row in FIG. 4), but is not limited to the example in FIG. 4 as long as the information necessary for the failure analysis can be notified. In addition, the communication failure occurrence notification may use either a format (data format or the like) or a protocol supported by the management server 2. Note that the address of the management server 2 is registered in the user terminal 1-1 in advance.

  As described above, in the present embodiment, in a centralized control network, communication is performed in a format in which a response can be confirmed for data transfer, and the presence / absence of a response from the user terminal 5-1 facing the user terminal 1-1. A failure is detected based on the information, and when the failure is detected, the management server 2 is notified of the occurrence of the failure together with information for identifying the communication path where the failure has occurred. Therefore, failure detection can be realized even if the user terminal 1-1 does not support a special monitoring protocol such as a test cell or a monitoring packet. Further, in the present embodiment, 3-1 to 3-8 only need to transfer the received packet in accordance with the instruction from the management server 2, and does not need a function of generating a specific packet for monitoring other than transferring the packet. It is. For this reason, for example, any communication device of any vendor can be used as long as it is a communication device that supports a protocol capable of transfer control such as OpenFlow, and can correspond to multi-vendor equipment.

Embodiment 2. FIG.
FIG. 5 is a diagram showing an example of a functional configuration of the management server 2 according to the second embodiment of the present invention. The configuration of the network system of the present embodiment is the same as that of the first embodiment. As shown in FIG. 5, the management server 2 of the present embodiment includes a control information processing unit 21, a transfer information control unit 22, a transfer information analysis unit 23, a communication path management unit 24, a failure information processing unit 25, and a communication path calculation. The unit 26 is provided. Further, a communication path management table 27 for storing communication paths and a configuration information management table 28 for storing network configuration information are held in the communication path management section 24 or in a storage section (not shown) of the management server 2. In the communication path management table 27, the currently set communication path is stored in a format in which, for example, a communication device to be routed is stored for each transmission source and transmission destination. The configuration information management table 28 is an example of network configuration information between communication devices for each communication device (devices constituting a network system such as terminals 1-1 and 5-1, communication devices 3-1 to 3-8). It is assumed that connection relations (input / output ports) etc. are registered. The configuration information management table 28 may be in any format as long as information capable of calculating a settable communication path is held.

  In the first embodiment, during communication with the opposite user terminal 5-1 with which the user terminal 1-1 is communicating, it is determined that there is no response from the user terminal 5-1, and a failure occurs in the management server 2. The operation of the management server 2 identifying and grasping the occurrence of the failure by notifying the above has been described. The operation of fault detection in the present embodiment is the same as that in the first embodiment. In the present embodiment, an operation after the management server 2 receives a communication failure occurrence notification will be described.

  For example, the format shown in FIG. 4 is used as the format of data (notification) transmitted from the user terminal 1-1 of the present embodiment to the management server 2. 4 shows the communication failure occurrence notification described in the first embodiment, the top row shows the transfer information notification, and the middle row shows the packet reception notification. The transfer information notification is used when notifying the communication path from the management server 2 to the communication devices 3-1 to 3-8, the user terminal 1-1, and the like, and includes control information and transfer information. The control information is the same as in the first embodiment. The packet reception notification is used when the communication devices 3-1 to 3-8 notify the management server 2 that a packet has been received. The packet reception notification is used in the operation of the third embodiment to be described later, but may not be used in the operation of the present embodiment.

  The control information processing unit 21 analyzes the control information stored in the data (notification) received from the user terminal 1-1, the communication device 3-1, etc., and also the user terminal 1-1, the communication device 3-1, etc. The control information is added to the information to be transmitted to and the notification after the addition of the control information is transmitted to the user terminal 1-1 or the like. If the received notification is a route creation request for requesting the creation of transfer information, the control information processing unit 21 uses the packet information (information for identifying the flow) stored in the route creation request as the transfer information analysis unit 23. To the transfer information analysis unit 23 to create transfer information (transfer rule when transferring as a communication flow and action (packet transfer method) that is transfer content when matching the rule) Request. In addition, if the received notification is a communication failure occurrence notification, the control information processing unit 21 outputs the failure occurrence information stored in the notification to the failure information processing unit 25. A route creation request for requesting creation of transfer information is transmitted to the management server 2 when the communication devices 3-1 to 3-8 transfer a packet of a flow that does not hold a communication route.

  Based on the request from the control information processing unit 21, the transfer information analysis unit 23 creates transfer information based on the requested packet information and the route information collected from the communication route management unit 26. Further, the transfer information analysis unit 23 creates transfer information corresponding to a detour route described later based on a request from the communication route calculation unit 26. The communication path management unit 24 manages communication paths and network configuration information, and updates the communication path management table 27 and the configuration information management table 28. The failure information processing unit 25 is based on the failure occurrence information output from the control information processing unit 21 (failure occurrence information stored in the failure detection notification transmitted from the user terminal 1-1 or the like). Requests the calculation of a communication route that avoids the failure route. When there is a request from the failure information processing unit 25, the communication route calculation unit 26 calculates a bypass route that is a communication route that avoids the failure route based on the communication routes collected from the communication route management unit 24, and calculates the calculated bypass route. Is requested to the transfer information analysis unit 23.

  Next, the operation of the present embodiment will be described. FIG. 6 is a diagram illustrating an example of a transfer information entry between the communication devices 3-1 according to the present embodiment. In the present embodiment, an example will be described in which the user terminal 1-1 detects a communication path failure with the user terminal 5-1, as in the first embodiment. The data transmitted from the user terminal 1-1 is transmitted to the management server 2 via the adjacent communication device 3-1.

  FIG. 7 is a sequence diagram illustrating an example of a path setting operation after the occurrence of a failure according to the present embodiment. As shown in FIG. 7, first, the control information processing unit 21 of the management server 2 receives a communication failure occurrence notification from the user terminal 1-1 via the communication device 3-1 (step S11). The control information processing unit 21 analyzes the control information of the received notification and extracts identification information for identifying the type of notification, and determines whether the notification is a packet reception notification or a communication failure occurrence notification (step S12). In this case, since it is a communication failure occurrence notification, the received failure occurrence information is transferred to the failure information processing unit 25 (step S13).

  Here, the control information is assumed to be protocol information (message used for control) in the SDN / OpenFlow control network (control plane). Any format and protocol may be used.

  Next, the failure information processing unit 25 identifies a communication path in which a failure has occurred based on the failure occurrence information (step S14), and requests the communication path calculation unit 26 to calculate a bypass route for the communication path (step S14). S15). The communication path calculation unit 26 requests the communication path management unit 24 to acquire a corresponding communication path based on the transmission source and transmission destination information stored as the failure occurrence information (step S16).

  Next, the communication path management unit 24 searches the communication path management table 270 for a corresponding communication path (currently set communication path) based on the transmission source and transmission destination information stored as the failure occurrence information. Obtaining (step S17), the communication device on the path of failure occurrence is extracted (step S18). Further, based on the transmission source and transmission destination information stored as the failure occurrence information, the communication path management unit 24 acquires a communication path that can connect the transmission source and the transmission destination from the configuration information management table 28 (step S19). ). The communication path management unit 24 then replies to the communication path calculation unit 26 with the extracted communication device information of the communication path in which the failure has occurred and the communication path that can connect the transmission source and the transmission destination (step S20).

  Next, the communication route calculation unit 26 determines (selects) a bypass route based on the response from the communication route management unit 24 (step S21), and sets transfer information for setting the selected bypass route in the communication device. The creation is requested to the transfer information analysis unit 23 (step S22).

  Next, based on the request from the communication path calculation unit 26, the transfer information analysis unit 23 uses the transfer information on the detour path (the transfer rule at the time of transfer when defining as a communication flow, the transfer contents when the rule is met) A certain action or the like) is created (step S23), and the transfer information control unit 22 is requested to set the transfer information for the communication device 3-1 corresponding to the detour path setting target (step S24). That is, the transfer information analysis unit 23 creates a packet transfer rule and a packet transfer method as shown in FIG. 6 based on the connection information of the communication device 3-1. This transfer information is used to transfer communication flows using both the active route in which a failure has occurred and the newly set detour route. Set to copy on the communication device. For example, as shown in the second line of FIG. 6, the packet transfer rule and action are set so that the packet to be transferred is copied and transferred from two ports.

  Next, the transfer information control unit 22 collects transfer information for each of a plurality of communication devices from the transfer information analysis unit 23 and generates transfer information notification information for each communication device to be set (set device analysis). Then, the control information processing unit 21 is requested to create control information for transmitting the transfer information to the communication device 3-1 to be set (step S26). The control information processing unit 21 creates control information for transmitting the transfer information to the communication device 3-1 (step S27), adds the control information to the transfer information received from the transfer information control unit 22, and transfers the transfer information. The transfer information is set by transmitting to the communication device 3-1 as a notification (step S28). At this time, not only the copying to the communication device 3-1 at the transmission end is set, but also transfer information corresponding to the detour route is transmitted as a transfer information notification to the communication device on the detour route. In addition, after copying to the communication apparatus 3-1, when the user terminal 1-1 does not receive a response from the opposing user terminal 5-1, even after copying, it can be determined that the failure of the opposing user terminal 5-1.

  In this embodiment, the user terminal 1-1 detects a failure and notifies the management server 2 of the occurrence of a communication failure. However, when the communication device 3-1 constantly monitors communication, the user terminal 1-1 Instead of 1-1, the communication device 3-1 at the transmission end may detect a failure and notify the management server 2 of the occurrence of the communication failure.

  As described above, in the present embodiment, after the user terminal 1-1 notifies the management server 2 of the occurrence of a communication failure, the management server 2 calculates a corresponding detour route based on the notified failure information, A setting is made to copy the transfer packet and transfer it to both paths for the communication device 3-1 at the transmitting end on both the working path and the detour path where the failure has occurred. For this reason, data in operation can be transferred through a detour route, and failure analysis work for identifying the location of the failure can be performed on the working route where the failure occurred, affecting communications that involve network outages, etc. Work can be done in parallel with failure handling work without giving

  In addition, since the failure location can be specified using communication data during normal operation, it is possible to detect the location of the failure without using a special protocol, which reduces the processing load on the communication device. At the same time, it can handle multi-vendor equipment.

  In this embodiment, it is assumed that there is a detour route. However, if there is no detour route, a corresponding failure has occurred from the management server 2 without performing a copy process in the communication device at the transmission end. A failure location can be detected by requesting the communication device on the communication path to receive a packet. After identifying the fault location by this method, detouring is performed between the communication devices at both ends where the fault location has occurred (for example, when the communication device 3-3 and the communication device 3-8 are connected, the communication device 3 -3 can be detoured (copied). In this way, it is possible to reverse the fault location identification and detour processing.

Embodiment 3 FIG.
FIG. 8 is a diagram illustrating a functional configuration example of the third embodiment of the communication device 3-1 according to the present invention. The configuration of the network system of the present embodiment is the same as that of the first embodiment. The communication devices 3-2 to 3-8 have the same configuration as that of the communication device 3-1. In the second embodiment, after receiving the communication failure occurrence notification, the management server 2 calculates a detour route based on the notified failure information and copies the transfer packet to the communication device 3-1 at the transmission end. It was set to both the working route and the detour route. In the present embodiment, an operation of detecting a fault occurrence location after the operation of the second embodiment will be described.

  As illustrated in FIG. 8, the communication device 3-1 according to the present embodiment includes a control information processing unit 31, a transfer information control unit 32, a communication data transfer processing unit 34, and a transfer information notification unit 35. In addition, the communication device 3-1 holds the transfer information entry table 33 in a storage unit (not shown) or the like.

  The control information processing unit 31 analyzes the control information stored in the data (notification) received from the management server 2 and outputs the transfer information included in the transfer information notification addressed to itself to the transfer information control unit 32. Then, control information is added to the information to be transmitted to the management server 2, and a notification after the addition of the control information is transmitted to the management server 2. The transfer information control unit 32 updates the transfer information entry table 33 based on the transfer information received from the control information processing unit 31 and confirms that the transfer information entry table 33 has been updated in the communication data transfer processing unit 34. Notification is made (the communication data transfer processing unit 34 is set to refer to the transfer information entry table 33). The communication data transfer processing unit 34 refers to the transfer information entry table 33 based on the notification from the transfer information control unit 32 and performs the transfer operation based on the transfer information entry table 33. If the packet is a flow packet not stored in the transfer information entry table 33, the communication data transfer processing unit 34 notifies the transfer information notification unit 35 to that effect. The transfer information entry table 33 has a format shown in FIG. 6, for example. When receiving the notification that the packet is a flow packet not stored in the transfer information entry table 33, the transfer information notification unit 35 requests the management server 2 to acquire transfer information about the flow.

  Next, the operation of the present embodiment will be described. In the present embodiment, when receiving the packet, the communication devices 3-1 to 3-8 notify the management server 2 of the reception of the packet. Thereby, if there is a communication device that does not receive the packet reception notification among the communication devices on the communication path, the management server 2 determines that there is a failure between the communication device and the adjacent communication device, Detect the fault location.

  FIG. 9 is a sequence diagram illustrating an example of the failure location detection operation according to the present embodiment. Here, as in the second embodiment, the user terminal 1-1 (or the communication device 3-1) detects a failure in the communication path with the user terminal 5-1, and first, in the second embodiment, With the operation described above, the management server 2 sets transfer information by transmitting a transfer information notification to the communication device 3-1 (step S31). At this time, in addition to setting to copy to the communication device 3-1 at the transmission end, the packet that the packet (flow) has been received as an action for the communication device on the working path where the failure is detected It is transmitted as a transfer information notification that is set to notify the management server 2 as a reception notification.

  When receiving the transfer information notification, the control information processing unit 31 of the communication devices 3-1 to 3-8 extracts the transfer information by analyzing the control information and determining that it is the transfer information notification (step S32). The transfer information is notified to the transfer information control unit 32 (step S33). The transfer information control unit 32 sets the transfer information in the transfer information entry table 33 (step S35), and instructs the communication data transfer processing unit 34 to transfer a packet based on the transfer information (step S36).

  Next, in the communication device 3-1, when the communication data transfer processing unit 34 receives a packet from the user terminal 1-1 or the adjacent communication device 3-1 (step S37), the communication data transfer processing unit 34 The corresponding transfer information is searched from the transfer information entry table 33, and the transfer information including the transfer destination and action of the received packet is acquired (step S38). Here, for example, it is assumed that the transfer information shown in the fourth line in FIG. 6 is acquired. In the transfer information on the fourth line in FIG. 6, the action is set to transfer the received packet from the physical port # 1 and notify the management server 2 that the packet (flow) has been received as a packet reception notification. ing.

  Based on the acquired transfer information, the communication data transfer processing unit 34 determines to perform a transfer process including transfer of a packet to the adjacent communication device 3-1 and notification to the management server 2 (packet reception notification) ( Step S39). Then, the communication data transfer processing unit 34 transfers the packet to the adjacent communication device 3-1 based on the determined transfer process (step S 40), and receives a packet for notifying the management server 2 of the reception of the packet. The transfer information notification unit 35 is requested to transmit a notification (step S41).

  The transfer information notification unit 35 collects packet information (packet information) necessary for packet reception notification, and requests the control information processing unit 31 to generate control information necessary for communication with the management server 2 (step S42). The control information processing unit 31 generates control information to be transmitted to the management server 2 (step S43), adds the control information to the packet information, and transmits the packet information to the management server 2 as a packet reception notification (step S44). This packet reception notification has, for example, the format shown in the middle part of FIG.

  These processes are respectively performed by the communication devices 3-1 to 3-8 on the working path where the failure has occurred. As shown in FIG. 2, (1) a failure occurrence notification is transmitted from the user terminal 1-1 to the management server 2, and (2) a copy instruction to the detour path from the management server 2 to the communication device 3-1 by the transfer information notification. (3) It is set to transmit a packet reception notification from the management server 2 to the communication devices 3-2 to 3-4 by a transfer information notification. Then, when receiving the packet, the communication devices 3-2 to 3-4 transmit (4) a packet reception notification to the management server. FIG. 2 shows an example in which a failure occurs between the communication device 3-3 and the communication device 3-4. In this case, the communication devices 3-2 and 3 are connected from the user terminal 1-1 to the user terminal 5- Although the packet reception notification is transmitted to the management server 2 in order to receive the packet addressed to 1, the communication device 3-4 does not receive the packet and therefore does not transmit the packet reception notification. Therefore, the management server 2 can detect the location of the failure based on whether or not a packet reception notification is received from each communication device on the working path.

  In preparation for packet reception notification at the time of failure, the transfer information analysis unit 23 acquires a working path from the communication path management unit 24 in advance, and confirms the presence or absence of reception for the corresponding communication device.

  As described above, in the present embodiment, as a process at the time of packet reception, a packet is transferred and a packet reception notification is transmitted to the management server 2 as a process at the time of packet reception to the communication device on the communication path (on the working path) where the failure has occurred. Information was set. For this reason, the management server 2 can detect the location of the failure based on the presence / absence of a packet reception notification from the communication device on the communication path. According to the present embodiment, since the location of the failure can be specified by the communication data in operation, this can be realized without supporting a special protocol for monitoring such as a test cell or a monitoring packet. For this reason, the processing load of the communication devices 3-1 to 3-8 is reduced, and it is possible to cope with multi-vendor equipment.

  In addition, by performing a failure analysis work for identifying the location of the failure on the working path of the failure occurrence, the work can be performed in parallel without affecting the communication that involves a network stop or the like.

  In the embodiments described so far, the occurrence of a failure is detected by confirming the presence or absence of a response from the other party by the user terminal 1-1. However, by applying this embodiment, UDP (USER) Even when there is no response from the other party such as Datagram Protocol), UDP is set in the protocol of the communication flow definition (for example, the packet transfer method in the fifth line in FIG. 6), and the UDP packet is received. By setting so as to notify the management server 2 at the time, the communication device 3-1 that cannot receive the reception notification of the UDP packet on the communication path can be detected, and the failure location can be specified. When there are many UDP communication flows, the number of notifications can be reduced by performing a process of notifying only the representative communication flow.

Embodiment 4 FIG.
In the third embodiment, the management server 2 is configured to transmit a packet reception notification to the management server 2 as a process at the time of packet reception to the communication devices 3-1 to 3-8 on the communication path in which the failure occurs. Although the fault location is detected, in this embodiment, the operation when the fault recovery is detected after the fault location is detected according to the third embodiment will be described.

  The configuration of the network system of the present embodiment is the same as that of the first embodiment. The configuration of each device constituting the network system is the same as that of the third embodiment.

  2 and FIG. 9, the communication apparatus 3 that has detected a failure location and has recovered from the failure and the management server 2 has not been able to receive a packet reception notification so far by the operation described in the third embodiment. It is assumed that a packet reception notification can be received from -4. When the packet reception notification can be received also from the communication devices 3-2 and 3-3 on the working path, the management server 2 can grasp that the communication path where the failure has occurred has been recovered.

  At this time, the management server 2 generates transfer information for canceling the copy setting of the transfer packet, and sets the transfer information in the communication device 3-1. At the same time, the instruction of the packet reception notification to the management server 2 is canceled for the communication devices 3-2 to 3-4 on the working path. As a result, the communication apparatuses 3-1 to 3-4 change the settings based on the newly received transfer information, and perform packet transfer on the working path before the failure occurs.

  As described above, in the present embodiment, even after detection of a failure occurrence location, the management server can detect failure recovery by detecting the presence / absence of a packet reception notification. In the present embodiment, these series of failure analysis processes can be performed by the communication data in operation, and therefore can be realized without supporting a special protocol for monitoring such as a test cell or a monitoring packet. For this reason, the processing load of the communication devices 3-1 to 3-8 is reduced, and it is possible to cope with multi-vendor equipment.

  Further, since the recovery processing work after the failure recovery can be performed only by canceling the copy transfer, the work can be performed without affecting the communication involving the stop of the network.

Embodiment 5. FIG.
Next, a communication failure occurrence notification method according to the fifth embodiment of the present invention will be described. In the present embodiment, in the base 4 to which the user terminal 1-1 belongs, when the number of user terminals in the base 4 is large, etc., the operation of collecting notifications to the management server 2 by the representative user terminal for each base explain.

  The configuration of the network system of the present embodiment is the same as that of the first embodiment. The configuration of each device constituting the network system is the same as that of the first embodiment. Here, it is assumed that the user terminal 1-1 is a representative user terminal. The configuration of the user terminal 1-1 is the configuration shown in FIG.

  The base information collection unit 12 illustrated in FIG. 1 collects failure occurrence notifications transmitted from user terminals in the base 4. For example, if the user terminal 1-2 does not receive a response from the communicating user terminal as in the first embodiment, it is determined that a communication failure has occurred, and the occurrence of the communication failure is represented by a representative user in the base. The user terminal 1-1 which is a terminal is notified. The configuration of the user terminal in the base 4 other than the user terminal 1-1 is a configuration in which the base information collection unit 123 is deleted from the configuration of FIG. However, as described above, the communication interface unit 11 of the user terminal in the base 4 other than the user terminal 1-1 transmits the failure occurrence notification not to the management server 2 but to the representative user terminal.

  Next, the base information collection unit 123 of the user terminal 1-1 collects information notified from the user terminals in the base 4, collects fault information corresponding to each user terminal, and sets the fault information as the entire fault information. The failure information is notified to the unit 122. The operations of the present embodiment other than those described above are the same as those of the first embodiment. Further, the operations of Embodiments 2 to 4 can be performed based on the communication failure notification of the present embodiment.

  As described above, in this embodiment, when the number of user terminals in the base is large, the representative user terminal collects the failure occurrence notifications in the base and notifies the management server 2 together. Thereby, the notification information (number of notifications) to the management server 2 can be reduced. Also, the network load can be reduced by reducing the notification information to the management server 2. In addition, even when the load on the management server 2 becomes a problem, the processing load on the management server 2 can be reduced by the user terminal representing the notification for each base collecting and collecting (collecting) the notification information. Is possible.

  As described above, the network system, terminal device, management device, and network monitoring method according to the present invention are useful for a centralized control type network.

  1-1, 1-2, 5-1 User terminal, 2 Management server, 3-1 to 3-8 Communication device, 4, 6 bases, 11 Communication interface unit, 12 Communication state monitoring unit, 121 Fault detection unit, 122 Failure occurrence notification unit, 123 Site information collection unit, 21, 31 Control information processing unit, 22 Transfer information control unit, 23 Transfer information analysis unit, 24 Communication path management unit, 25 Fault information processing unit, 26 Communication path calculation unit, 27 Communication path management table, 28 Configuration information management table, 31 Control information processing unit, 32 Transfer information control unit, 33 Transfer information entry table, 34 Communication data transfer processing unit, 35 Transfer information notification unit

Claims (8)

A network system comprising a management device, a plurality of communication devices whose communication paths are set by the management device, and a terminal device connected to the communication device,
The first terminal device connected to the first communication device which is one of the communication devices,
A communication processing unit that communicates with a second terminal device connected to a second communication device that is the communication device other than the first communication device;
A failure detection unit that detects a communication failure of a communication path with the second terminal device based on presence or absence of a response from the second terminal device in the communication;
A failure occurrence notification unit that transmits a failure occurrence notification storing failure information, which is information for identifying a communication path in which a communication failure is detected, to the management device when a communication failure is detected by the failure detection unit; ,
A network system comprising: The management device
A failure information control unit that identifies a communication path in which a communication failure has occurred based on the failure information stored in the received failure occurrence notification;
A communication path management unit that obtains a communication path other than the communication path that is the same as the communication path identified by the failure information control unit and has a transmission source and a transmission destination as candidates for a detour path;
A communication path calculation unit that selects a detour path from the candidates obtained by the communication path management unit;
The transmission end device as transfer information set in the transmission end device that is the communication device that is located on both the route of the selected detour route and the failure route that is a communication route in which a communication failure has occurred and is the transmission end The first transfer information storing the transfer rule for copying the transfer data and transferring the transfer data to both the failure path and the detour path is set in the communication apparatus on the detour path other than the transmission end apparatus. A transfer information analysis unit for generating second transfer information storing transfer rules for performing transfer on the detour path as transfer information to be transmitted;
With
The first transfer information is transmitted to the transmitting end device, and the second transfer information is transmitted to the communication device on the detour path other than the transmitting end device. Network worm system. The transfer information analysis unit instructs to transmit a packet reception notification to the management apparatus when a packet corresponding to the failure path is received as transfer information of the communication apparatus on the failure path. Generate information,
The communication device that has received the third transfer information transmits a packet reception notification to the management device,
The network system according to claim 2, wherein the management device identifies a failure occurrence location on the failure path based on whether or not the packet reception notification is received.   When the management device receives a packet reception notification from all the communication devices on the failure path after identifying the failure occurrence location, the management device releases the copy of the packet to the transmission end device, The network system according to claim 3, wherein an instruction is given to transfer a packet to be transferred to the failure path. When there are a plurality of the terminal devices in the same base, one terminal device in the base is set as a representative terminal device, and the terminal devices other than the representative terminal device send the failure occurrence notification to the representative terminal device. The network system according to claim 1, wherein the representative terminal device aggregates and transmits the failure notifications of the terminal devices in a base. The terminal device in a network system comprising a management device, a plurality of communication devices whose communication paths are set by the management device, and a terminal device connected to the communication device,
A communication processing unit that communicates with the opposite terminal device that is the terminal device connected to the communication device other than the communication device to which the device is connected;
A failure detection unit that detects a communication failure of a communication path with the opposite terminal device based on the presence or absence of a response from the opposite terminal device in the communication;
A failure occurrence notification unit that transmits a failure occurrence notification storing failure information, which is information for identifying a communication path in which a communication failure is detected, to the management device when a communication failure is detected by the failure detection unit; ,
A terminal device comprising: The management device in a network system comprising a management device, a plurality of communication devices whose communication paths are set by the management device, and a terminal device connected to the communication device,
The management device
A failure detection notification for notifying that a failure in communication with the opposite terminal device in communication with the terminal device is detected is received from the terminal device, and a communication path in which the failure in communication is detected is stored in the failure occurrence notification. A failure information control unit that identifies a communication path in which a communication failure has occurred based on failure information that is information for identifying;
A communication path management unit that obtains a communication path other than the communication path that is the same as the communication path identified by the failure information control unit and has a transmission source and a transmission destination as candidates for a detour path;
A communication path calculation unit that selects a detour path from the candidates obtained by the communication path management unit;
The transmission end device as transfer information set in the transmission end device that is the communication device that is located on both the route of the selected detour route and the failure route that is a communication route in which a communication failure has occurred and is the transmission end The first transfer information storing the transfer rule for copying the transfer data and transferring the transfer data to both the failure path and the detour path is set in the communication apparatus on the detour path other than the transmission end apparatus. A transfer information analysis unit for generating second transfer information storing transfer rules for performing transfer on the detour path as transfer information to be transmitted;
With
The management apparatus, wherein the first transfer information is transmitted to the transmission end apparatus, and the second transfer information is transmitted to the communication apparatus on the bypass path other than the transmission end apparatus. A network monitoring method in a network system comprising a management device, a plurality of communication devices whose communication paths are set by the management device, and a terminal device connected to the communication device,
A first terminal device connected to a first communication device that is one of the communication devices,
A communication step of performing communication with a second terminal device connected to a second communication device which is the communication device other than the first communication device;
A failure detection step of detecting a communication failure in a communication path with the second terminal device based on presence or absence of a response from the second terminal device in the communication;
A failure occurrence notification step of transmitting a failure occurrence notification storing failure information, which is information for identifying a communication path in which a communication failure is detected, to the management device when a communication failure is detected in the failure detection step; ,
A network monitoring method comprising:

Images