JP4224385B2 - Network monitoring system - Google Patents

Description

  The present invention relates to a network monitoring system including a plurality of monitoring devices in a redundant configuration for monitoring a plurality of monitoring target devices (monitored devices) existing in a monitoring target network from a plurality of monitoring terminals, and more particularly to a plurality of monitoring devices. The present invention relates to a network monitoring system having a function of changing the connection of a plurality of monitoring terminals under a monitoring device of an inoperable system to a subordinate of the monitoring device of an operable system when any of the above becomes inoperable due to a failure or the like.

  In a network monitoring system having a redundant configuration of a plurality of monitoring devices that monitor a plurality of monitoring target devices (monitored devices) on a network from a plurality of monitoring terminals, one monitoring device can be connected under the control. The maximum number of monitoring terminals is defined from the viewpoint of system resources and performance protection of the monitoring device.

  In a conventional network monitoring system, when a monitoring terminal tries to connect exceeding the number of connectable monitoring devices, the monitoring device rejects the connection request and notifies the monitoring terminal to that effect.

  Monitoring terminals include important terminals (critical terminals) such as central terminals that always require network monitoring and terminals that execute important batch processing, and non-critical terminals (such as terminals that perform preliminary monitoring) Important terminal).

  When trying to connect this important terminal to the monitoring device, if the number of connected terminals including the non-important terminal is connected to the connectable number, it is necessary to disconnect the non-important terminal from the monitoring device by telephone contact etc. As a result, problems such as business delays occur.

  Furthermore, if the monitoring station becomes unattended with the non-critical terminal connected to the monitoring device, there is an unavoidable problem of business suspension.

In addition, if a failure occurs in the monitoring device while the important terminal is connected to the monitoring device, the number of connectable terminals including the non-important terminal can be connected even if the connection to the monitoring device of another system is transferred. In the same way, the problem that the connection is not possible occurs.
JP 2003-51822 A

  An object of the present invention is to enable a plurality of monitoring terminals subordinate to an inoperable system monitoring device to be in an operable system monitoring device when any of the redundant monitoring systems in a redundant configuration becomes inoperable due to a failure or the like. The object is to provide a method for enabling subordinate connection change.

In order to solve the above-described problems, a network monitoring system according to the present invention is a network monitoring system including a redundant configuration of a plurality of systems of monitoring devices that respectively monitor a plurality of monitored devices existing in a monitored network from a plurality of monitoring terminals. There;
When any of the plurality of monitoring devices becomes inoperable, the plurality of monitoring terminals under the inoperable system monitoring device are subordinate to the operable system monitoring device according to a preset priority. Each of the monitoring systems of the plurality of systems includes a control means for changing connection.

In this configuration, when the control unit changes the connection of the plurality of monitoring terminals under the monitoring device of the inoperable system to the subordinate of the monitoring device of the operable system in an order of the high priority of the priority, Disconnect the monitoring terminal with a lower priority than the monitoring terminal connected to the monitoring device of the inoperable system compared to the priority of each of the monitoring terminals connected to the monitoring device of the operable system To do.

  In the network monitoring system of the present invention, for each identification information of each monitoring terminal, priority order information indicating the priority, connection status information with the monitoring apparatus, connection monitoring apparatus information, and exchange connection candidate monitoring terminal The monitoring devices of the plurality of systems further include storage means having an information storage area.

  In this configuration, the control unit monitors the operable system in the order of high priority of the priorities of the plurality of monitoring terminals under the monitoring apparatus of the inoperable system based on the storage information of the storage unit. When changing the connection under the control of the device, the priority of each of the plurality of monitoring terminals connected to the monitoring device of the operable system is compared with the priority of the monitoring terminal connected to the monitoring device of the inoperable system In order to disconnect the monitoring terminal under the monitoring device of the operable system having a low priority and to accept a connection change request from the monitoring terminal having a high priority connected to the monitoring device of the inoperable system In addition, the connection status information, the connection monitoring device information, and the monitoring terminal information of the exchange connection candidate in the storage unit are rewritten.

  In addition, when the monitoring device of the inoperable system is restored to an operable state, the control means of the recovery monitoring device includes identification information of the monitoring terminal in the storage means, priority information indicating the priority, and the connection With reference to the status information, the monitoring terminal in the disconnected state is permitted to connect up to the specified number of connections according to the high priority order of the priorities.

  According to the present invention, when any one of a plurality of monitoring devices in a redundant configuration becomes inoperable due to a failure or the like, a plurality of monitoring terminals under the inoperable system monitoring device are set in advance. Each of the multiple monitoring devices is equipped with a control means to change the connection under the operable monitoring device, and the connection of the monitoring terminal according to the situation is ensured. It is possible to prevent work delays or stoppages due to the inability to connect priority monitoring terminals (important terminals).

  Other objects, features and advantages of the present invention will become apparent upon reading the specification set forth below when taken in conjunction with the drawings and the appended claims.

  Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. The drawings show preferred embodiments of the invention. However, the invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.

[System configuration]
Referring to FIG. 1 showing a system configuration in an embodiment of the present invention, a network monitoring system 1 includes a plurality of monitoring target devices (monitored devices) 3 existing in a monitoring target network 2 from a plurality of monitoring terminals 4, respectively. A plurality of monitoring devices 5 of a redundant configuration to be monitored are provided.

Each monitored device 3 is a network device (network element) such as a router. Each monitoring terminal 4 is a client device that allows a user (network monitor) to visually display the status of the monitored device 3 and to instruct (control) the operation of the monitored device 3.

  Here, four monitoring terminals 4 are illustrated as an example. These four monitoring terminals 4 are arranged in different monitoring stations and are classified into a main (central) monitoring terminal and a sub (sub) monitoring terminal.

  The main monitoring terminal 4 is an important terminal (important terminal) such as a central terminal that always requires network monitoring or a terminal that executes important batch processing. The sub-monitoring terminal 4 is an insignificant terminal (non-critical terminal) that performs preliminary monitoring (for example, monitoring only a log).

These monitoring terminals 4 are accommodated in a network (monitoring terminal connection network) 6 such as a LAN (Local Area Network) and / or a WAN (Wide Area Network) and the network 6 is connected to any one of a plurality of monitoring devices 5. Connected selectively.

  The monitoring devices 5 of a plurality of systems are connected to a monitoring terminal connection network 6 that accommodates the monitoring terminals 4 and a network (monitored device connection network) 8 that is connected to the monitoring target network 2 and the monitored device 3. Server device. Here, the monitoring devices 5 illustrated as a redundant redundant configuration are connected to each other through a network (monitoring device interconnection network) 7 and can periodically transmit and receive various types of information about the status of each monitoring device as a health check. .

[Configuration and function of monitoring device and monitoring terminal]
Referring to FIG. 2 showing the configuration of the monitoring device 5 and the monitoring terminal 4 in the network monitoring system 1 adopting the above-described system configuration together with FIG. 1, in each of the monitoring devices 5 of a plurality of systems, the communication unit 51 includes the monitoring terminal 4, Connection and communication processing with the monitoring device 3 and another system monitoring device (other monitoring device) 5 are performed. The communication unit 51 may be provided for each connection target device.

  The failure detection function unit 52 is an operation state of the other monitoring device 5 (here, a failure occurrence state) and information on the monitoring terminal 4 connected to the other monitoring device 5 (strictly, logically connected). Are periodically collected via the monitoring device interconnection network 7 and the communication unit 51.

  The priority table 53 holds (stores) a predetermined priority of each monitoring terminal 4. Details of the priority table 53 are shown in FIGS. The terminal connection management unit 54 performs processing up to the connection with the monitoring terminal 4 under the control of the own system monitoring device (self monitoring device) 5 based on the stored information in the priority table 53.

  The other system ID table 55 holds the ID (identification information) of the other monitoring device 5 used in the failure detection function unit 52. Details of this other system ID table 55 are shown in FIG. The protection time table 56 is a table for setting the protection time.

  In each monitoring terminal 4, the communication unit 41 performs connection and communication processing with the monitoring device 5. The reconnection processing unit 42 performs reconnection processing when the connection with the monitoring device 5 is disconnected.

  In this network monitoring system 1, when any of the monitoring devices 5 of a plurality of systems becomes inoperable due to a failure or the like, a plurality of monitoring terminals 4 under the monitoring device 5 of the inoperable systems are set in advance. Since the function of changing the connection under the operable system monitoring device 5 according to the priority level is a basic feature, illustration and description of the functional configuration relating to the monitoring control itself of the network 2 and the monitored device 3 are omitted.

More specifically, in each monitoring device 5, the failure detection function unit 52 passes through the network 7 and the communication unit 51, the failure occurrence state of the other monitoring device 5 corresponding to the contents of the other system ID table 55, and the other monitoring device 5. Information on the connection monitoring terminal 4 is periodically acquired from the other monitoring devices 5 connected to each other. At this time, the connection monitoring terminal identification information of the other monitoring device 5 is stored in the priority table 53.

  In the failure monitoring device 5 in which a failure has occurred, if the failure is not recovered even after a certain protection time has passed since the response cannot be returned to the periodic communication from the other monitoring device 5, the failure detection function unit 52 of the other monitoring device 5 Detects the occurrence of a failure in the failure monitoring device 5. When the failure detection function unit 52 detects the occurrence of a failure in the other monitoring device 5, the failure detection function unit 52 notifies the terminal connection management unit 54 to that effect.

  Upon receiving this notification, the terminal connection management unit 54 confirms the priority of the monitoring terminal 4 subordinate to the monitoring apparatus 5 in which the failure has occurred in the priority table 53, and the low priority monitoring terminal 4 subordinate to the own monitoring apparatus 5 It is determined whether or not another monitoring terminal 4 needs to be connected. As a result of the determination, the terminal connection management unit 54 sets a setting in a place (an item of the exchange monitoring terminal in FIGS. 5 to 8 described in detail later) in the priority table 53 when disconnection is necessary. To make the connection acceptable.

  However, if there is no connection request (connection change request) from the predicted monitoring terminal 4 even after a certain period of time has elapsed, the terminal connection management unit 54 selects the predicted monitoring terminal 4 from the reception location of the priority table 53. Delete the specified condition. As a result, even if the accepting location is not the predicted monitoring terminal 4 but is the monitoring terminal 4 having the next highest priority, the connection is accepted.

  When a connection request is received from a monitoring terminal 4 other than the monitoring terminal 4 connected to the self-monitoring device 5 after the failure is detected, the terminal connection management unit 54 refers to the priority table 53 and sends the request to the self-monitoring device 5. When there is a monitoring terminal 4 having a lower priority than the monitoring terminal 4 that issued the request among the connected monitoring terminals 4, the monitoring that has transmitted the connection request after disconnecting from the low priority monitoring terminal 4 Connection with the terminal 4 is performed.

  When the fault monitoring device 5 is restored, if the corresponding monitoring device is operating normally even after a certain protection time has elapsed from the state in which a response is sent back to the regular communication from the other monitoring device 5, etc. The failure detection function unit 52 of the monitoring device 5 detects the recovery of the recovery monitoring device 5. Further, the recovery monitoring device 5 acquires the current connection status of the monitoring terminal 4 from the other monitoring device 5 during this protection time.

  The failure detection function unit 52 of the other monitoring device 5 notifies all the monitoring terminals 4 described in the priority table 53 of the recovery. In addition, the recovery monitoring device 5 predicts the monitoring terminal 4 that transmits a connection request from the priority table 53, and implements a description that is accepted by the own monitoring device on the priority table 53. Thereby, priority connection control of the monitoring terminal 4 having a high priority (a higher priority) can be performed.

[Specific operation example]
Next, a specific operation example in the network monitoring system 1 according to the embodiment of the present invention will be described with reference to FIGS.
A network monitoring system 1 which is a premise for explaining this operation example is a three-system (triple configuration) monitoring device (# 1) that monitors a plurality of monitored devices 3 on a network 2 from three monitoring terminals 4 respectively. To # 3) 5 (see FIG. 3). In this network monitoring system 1, when one of the three monitoring devices 5 becomes inoperable (failure), the three monitoring terminals 4 subordinate to the inoperable monitoring device (# 3) 5 are connected. The process of allocating (changing the connection) under the operable system monitoring devices (# 1, # 2) 5 according to the preset priority will be described.

  FIG. 3 shows a state transition of connection allocation of the monitoring terminal 4 when a failure occurs in the monitoring device (# 3) 5 and when the failure is recovered.

  FIG. 4 shows an example of another system ID table 55 in the monitoring device 5. This other system ID table 55 has an item that matches the item of the connection monitoring device in the priority table 53, and holds the IP addresses (monitoring device IP) of all the monitoring devices of the other system and the own system.

  5, 6, 7, and 8 show an example of the priority table 53 in the monitoring device 5. The priority table 53 includes information items of a monitoring terminal ID, a monitoring terminal IP, a monitoring terminal priority, a state (connection status), a connection monitoring device, and an exchange monitoring terminal (an exchange connection candidate monitoring terminal). In this example, the monitoring terminal ID and the monitoring terminal IP are used individually, but IP (IP address) may be used instead of ID (identification information).

  In this operation example, the maximum number of monitoring terminals connected to each monitoring device 5 is three, and the priority of the monitoring terminal 4 has four priority levels from the first to the fourth. The higher the numerical value, the higher the priority. The degree is high. Further, the “state” in the priority table 53 has three stages, representing 0: connection, 1: disconnection, 2: waiting for connection.

  When a failure occurs in the monitoring device # 3 from the normal state shown in FIG. 3A, the monitoring terminals with IDs 7, 8, and 9 connected to the monitoring device # 3 through the monitoring terminal connection network 6 are other monitoring devices. It is necessary to connect to # 1 and # 2 through the monitoring terminal connection network 6 (FIG. 3B). The detailed contents of the connection result of each monitoring terminal at this time are as follows.

  If a failure occurs in the monitoring device # 3 and the monitoring device cannot be monitored, the monitoring device # 1, if the failure is not recovered even after a certain protection time set in advance in the protection time table 56 has elapsed. The failure detection function unit 52 of # 2 detects the failure occurrence state of the monitoring device # 3 and determines that the monitoring terminals with IDs: 7, 8, and 9 send reconnection requests from their own priority tables 53, respectively. (Predict) (FIG. 5A).

  The terminal connection management unit 54 notified of the failure occurrence state from the failure detection function unit 52 of the monitoring device # 1 indicates the status of these monitoring terminals connected to the monitoring device # 3 in the priority table 53 as 1 Rewrite (disconnect) to clear the connection monitoring device number # 3 (FIG. 5B). Then, the terminal connection management unit 54 determines, based on the priority table 53, to which monitoring device each disconnected monitoring terminal should be connected. At this time, the connection order is determined from the monitoring terminal with the highest priority. In other words, the terminal connection management unit 54 determines that this connection is made because the monitoring terminal with ID: 9 has the highest priority “3” among the monitoring terminals with IDs: 7, 8, and 9 that send connection requests. Think first.

  In the priority table 53, the connection monitoring terminals of the monitoring devices in which no failure has occurred are IDs: 1, 2, 3, 4, 5, 6. A monitoring terminal having a lower priority than a monitoring terminal with ID: 9 is a monitoring terminal with a priority of “2” or lower, that is, a monitoring terminal with IDs: 2, 5, and 6. Among them, the monitoring terminal with the lowest priority is the monitoring terminal with ID: 2, 5 having the priority “1”. The terminal connection management unit 54 determines that the monitoring terminal with the younger ID: 2 in the arrangement order is disconnected instead of the connection with the monitoring terminal with the ID: 9 because there is no further narrowing by superiority or inferiority. The status item corresponding to the monitoring terminal is changed from 0 (connected) to 1 (disconnected), and the item of the exchange monitoring terminal is changed to 9 (ID: 9) (FIG. 5C). Furthermore, the terminal connection management unit 54 changes the status item of the monitoring terminal ID: 9 for performing connection from 1 (disconnected) to 2 (waiting for connection), and sets the item of the connection monitoring device to # 1 (FIG. 6). (A)).

  In this example, the arrangement order is applied to final narrowing down, but other methods such as making the priority unique may be used.

  The monitoring device # 2 makes the same determination as above, determines that there is no monitoring terminal to be disconnected in its own device, and changes the monitoring terminal ID: 2 status item from 0 (connected) to 1 (disconnected). The terminal item is changed to 9 (ID: 9) (FIGS. 5A to 5C), and the status item of the monitoring terminal ID: 9 to be connected is changed from 1 (disconnected) to 2 (waiting for connection) And the connection monitoring device item is set to # 1 (FIG. 6A).

  Subsequently, in the monitoring device 2, the terminal connection management unit 54 needs to find a monitoring terminal to be disconnected instead of the monitoring terminal ID 7 having the second highest priority “2”. Therefore, as in the case of searching for a substitute for the monitoring terminal ID: 9, when a monitoring terminal having no failure and having a third priority “1” or lower is searched, the monitoring terminals with IDs: 2, 5 Is applicable. However, for the monitoring terminal with ID: 2, since the flag “1” being disconnected is set in the status item according to the previous determination, it is excluded from this candidate, and the monitoring terminal with ID: 5 remains.

  Therefore, the terminal connection management unit 54 determines to disconnect the monitoring terminal with ID: 5 instead of the monitoring terminal with ID: 7, and changes the status item of monitoring terminal ID: 5 from 0 (connection) to 1 (disconnection). ), The item of the exchange monitoring terminal is changed to 7 (ID: 7) (FIG. 6B), and the state of the monitoring terminal ID: 7 to be connected is changed from 1 (disconnected) to 2 ( The connection monitoring device item is set to # 2 (FIG. 6C)).

  Monitoring device # 1 makes the same determination as above, determines that there is no monitoring terminal to be disconnected in its own device, changes the status item of monitoring terminal ID: 5 from 0 (connected) to 1 (disconnected) The item of the exchange monitoring terminal is changed to 7 (ID: 7) (FIG. 6B), and the status of the monitoring terminal ID: 7 to be connected is changed from 1 (disconnected) to 2 (waiting for connection) Then, the item of the connection monitoring device is set to # 2 (FIG. 6C).

  The monitoring terminals with IDs 7 and 9 that have been disconnected due to the failure of the monitoring device # 3 transmit reconnection requests from the reconnection processing unit 42 via the communication unit 41 and the monitoring terminal connection network 6, respectively. At this time, each monitoring terminal transmits a connection request to the monitoring device # 1 with the youngest ID among the monitoring devices # 1 and # 2 except the monitoring device # 3 that has become unable to connect. Both the monitoring terminals with IDs: 7 and 9 make this determination and transmit. However, in the monitoring apparatus # 1 on the receiving side, the terminal connection management unit 54 has priority when receiving a request from the monitoring terminal with ID: 7. Referring to the degree table 53, the monitoring terminal connection state of the own apparatus is determined.

  By referring to the priority table 53 (FIG. 6C), the terminal connection management unit 54 recognizes that only the monitoring terminal ID: 2 is disconnected in the connection monitoring device # 1. To do. When the terminal connection management unit 54 searches the priority table 53 and searches for the monitoring terminal from the item contents of the exchange monitoring terminal corresponding to the monitoring terminal ID: 2, ID: 9 is found as a search result. Based on the received connection request, since the monitoring terminal ID of the transmission source is 7, the terminal connection management unit 54 of the monitoring apparatus # 1 returns a message indicating that the monitoring terminal ID does not match to the monitoring terminal of ID: 7. Upon receiving this reply content, the reconnection processing unit 42 of the monitoring terminal with ID: 7 transmits a connection request to the monitoring device # 2, which is the next monitoring device.

On the other hand, when the reconnection processing unit 42 of the monitoring terminal with ID: 9 transmits a reconnection request to the monitoring device # 1, in the monitoring device # 1, the terminal connection management unit 54 requests from the monitoring terminal with ID: 7. In the same manner as when the message is received, the priority search table 53 is searched for in order of the monitoring terminal disconnected and the replacement monitoring terminal of the monitoring terminal. As a result, since the ID: 9 is found from the item of the exchange monitoring terminal and matches the monitoring terminal ID of the connection request transmission source, the terminal connection management unit 54 disconnects the connection (logical connection) of the monitoring terminal ID: 2. Then, the connection request with the monitoring terminal ID: 9 is accepted. The terminal connection management unit 54 changes the contents of the priority table 53 according to the contents of the connection request, changes the status item of the monitoring terminal ID: 9 to 0 (connection), and connects and monitors the connection monitoring device of the monitoring terminal ID: 2. Rewriting is performed so that each item of the terminal is cleared (FIGS. 3C and 7A).

  Further, the reconnection processing unit 42 of the monitoring terminal with ID: 7 retransmits the reconnection request to the monitoring device # 2, but the terminal connection management unit 54 of the monitoring device # 2 monitors the priority table 53. It is 7 (ID: 7) that the status item of terminal ID: 5 is 1 (disconnected), and the monitoring terminal ID: 5 holds the item of the exchange monitoring terminal. That is, since it matches the monitoring terminal in the waiting state, the connection (logical connection) with the monitoring terminal ID: 5 is disconnected and the connection request from the monitoring terminal with ID: 7 is accepted. The terminal connection management unit 54 changes the status item of the monitoring terminal ID: 7 to 0 (connection) according to the content of the connection request in accordance with the content of the priority table 53, and the connection monitoring device and the exchange monitoring terminal with the monitoring terminal ID: 5 Are rewritten so as to clear each item (FIG. 3C, FIG. 7B).

  If no connection request is received from the corresponding monitoring terminal for a certain period of time in the state of the priority table 53 shown in FIG. 6C (waiting for a request from the monitoring terminal), the terminal connection management unit 54 The status item of the corresponding monitoring terminal in the priority table 53 is set to 1 (disconnected), and the items of the connection monitoring device and the exchange monitoring terminal are cleared. When a request from the monitoring terminal is received in this state, when receiving the request, the monitoring apparatus # 1 on the receiving side refers to the priority table 53 and determines the monitoring terminal connection state of the own apparatus. That is, based on the priority table 53 shown in FIG. 7C, only the monitoring terminal ID: 2 is disconnected in the connection monitoring device # 1. The terminal connection management unit 54 searches the priority table 53 and searches for a monitoring terminal having the monitoring terminal ID: 2 in the contents of the replacement monitoring terminal. However, since it has been cleared, the replacement monitoring terminal is not found. In such a case, the priority is extracted from the request information of the request source monitoring terminal, and the priority level of the priority of the monitoring terminal with ID: 2 whose status item is 1 (disconnected) is determined, and the ID : When the priority of the monitoring terminal of 2 is higher than the priority “1” (2 or more), the connection with the monitoring terminal of ID: 2 is disconnected and the requesting monitoring terminal is connected. If the priority is low or the same (1 or less), the request is rejected and the monitoring terminal with ID: 2 is kept connected.

  Next, a terminal connection determination process when the monitoring apparatus # 3 in the failure occurrence state is restored will be described. When the monitoring device # 3 is restored and a response is returned to the other monitoring device monitoring request of the failure detection function unit 52 of the monitoring devices # 1 and # 2, the other monitoring device # 1, # 2 is detected as the recovery of the monitoring device # 3. When the recovery of the monitoring device # 3 is detected, the terminal connection management unit 54 of the monitoring devices # 1 and # 2 notifies the recovery of the monitoring device # 3 to all the monitoring terminals described in the priority table 53. To do. On the priority table 53 shown in FIG. 7B, the monitoring terminals with IDs 2, 5, and 8 in the disconnected state each receive the notification, and the reconnection processing unit 42 sends the monitoring device # 3 to the monitoring device # 3. Send a connection request.

  In the monitoring device # 3, the connection status of each monitoring terminal is acquired from the monitoring device # 1 and the monitoring device # 2 during the protection time until recovery, and the priority table 53 is updated (from FIG. 5A). (To FIG. 7 (B)) The terminal connection management unit 54 determines a monitoring terminal that transmits a connection request based on the updated priority table 53. At this time, the monitoring terminal having a high priority In order, # 3 is described in the connection monitoring device item (FIG. 8 (A)) In this example, even if all the monitoring terminals in the disconnected state are accommodated, the maximum number of connections is not exceeded. 3 is described.

When the connection request from the monitoring terminal is received, the terminal connection management unit 54 of the monitoring device # 3 refers to the priority table 53 and selects the monitoring terminal in the state: 1 (disconnected) and the connection monitoring terminal: # 3. Search for. As a result, the terminal connection management unit 54 receives the connection when the monitoring terminals with IDs: 2, 5, and 8 are targeted and receives a connection request from each monitoring terminal ID. The status item of the target monitoring terminal ID is changed from 1 (disconnected) to 0 (connected) (
FIG. 3 (D) and FIG. 8 (B)).

[effect]
According to the embodiment of the present invention described above, when any one of the redundant monitoring systems 5 becomes inoperable due to a failure or the like, the plurality of monitoring terminals under the inoperable monitoring apparatus. 4 is important since each of the multiple monitoring devices has a control means for changing the connection under the monitoring device of the operable system according to a preset priority, and the connection of the monitoring terminal corresponding to the situation is ensured. It is possible to prevent delays or suspension of work due to the inability to connect a high priority monitoring terminal (important terminal) when performing various operations.

  In addition, by providing a detection protection time when the monitoring device is inoperable, it is possible to prevent erroneous detection of other monitoring devices down due to congestion of the monitored network 2 (down detection and recovery detection frequently occur). Therefore, stable connection with the monitoring terminal can be guaranteed.

  Furthermore, even when the high priority monitoring terminal that cannot change the connection, such as when there is a failure in the high priority monitoring terminal that changes the connection when the monitoring device fails, the low priority monitoring terminal after the protection time has passed. Therefore, it is possible to guarantee the maximum number of connected monitoring terminals as the entire monitoring system.

[Modification]
The processing in the above-described embodiment is provided as a computer-executable program, and can be provided via a recording medium such as a CD-ROM or a flexible disk, and further via a communication line.

  In addition, each of the processes in the above-described embodiment can be performed by selecting and combining any or all of the processes.

[Others]
(Appendix 1) A network monitoring system including a plurality of redundant monitoring devices that monitor a plurality of monitored devices existing in a monitoring target network from a plurality of monitoring terminals;
When any of the plurality of monitoring devices becomes inoperable, the plurality of monitoring terminals under the inoperable system monitoring device are subordinate to the operable system monitoring device according to a preset priority. A network monitoring system provided in each of the plurality of monitoring devices with a control means for changing connection. (1)
(Supplementary note 2) The control unit changes the connection of the plurality of monitoring terminals under the monitoring device of the inoperable system to the subordinates of the monitoring device of the operable system in order of high priority of the priority. Network monitoring system.

(Supplementary note 3) When the control means changes the connection of the plurality of monitoring terminals under the monitoring device of the inoperable system to the subordinate of the monitoring device of the operable system in the order of the high priority of the priority, Disconnect the monitoring terminal with a lower priority than the monitoring terminal connected to the monitoring device of the inoperable system compared to the priority of each of the monitoring terminals connected to the monitoring device of the operable system The network monitoring system according to appendix 1. (2)
(Supplementary note 4) The network monitoring system according to supplementary note 1, wherein the plurality of monitoring terminals include a main monitoring terminal that performs central monitoring and a secondary monitoring terminal that performs preliminary monitoring.

(Supplementary note 5) The network monitoring system according to supplementary note 1, wherein the plurality of monitoring devices further include storage means having a storage area for priority information indicating the priority for each identification information of each monitoring terminal.

(Supplementary Note 6) A storage having storage areas for priority information indicating the priority, connection status information with a monitoring device, connection monitoring device information, and monitoring terminal information of exchange connection candidates for each identification information of each monitoring terminal The network monitoring system according to claim 1, wherein the plurality of monitoring devices further include means. (3)
(Supplementary note 7) Based on the storage information of the storage unit, the control unit monitors the plurality of monitoring terminals under the monitoring device of the inoperable system in the order of high priority of the priority. When changing the connection under the control of the device, the priority of each of the plurality of monitoring terminals connected to the monitoring device of the operable system is compared with the priority of the monitoring terminal connected to the monitoring device of the inoperable system In order to disconnect the monitoring terminal under the monitoring device of the operable system having a low priority and to accept a connection change request from the monitoring terminal having a high priority connected to the monitoring device of the inoperable system The network monitoring system according to claim 6, wherein the connection status information, the connection monitoring device information, and the monitoring terminal information of the exchange connection candidate in the storage unit are rewritten. (4)
(Supplementary note 8) When the monitoring device of the inoperable system is restored to an operable state, the control means of the recovery monitoring device includes identification information of the monitoring terminal in the storage means, priority information indicating the priority, and The network monitoring system according to appendix 7, wherein the network monitoring system is configured to refer to the connection status information and allow a monitoring terminal in a disconnected state to connect up to a specified number of connections in accordance with an order of high priority of the priority. (5)
(Supplementary note 9) When any one of the monitoring systems of the plurality of systems becomes inoperable, the control means controls the connection change after a preset protection time has elapsed. system.

(Supplementary note 10) When the connection change request from the monitoring terminal to be changed in connection does not arrive within a preset time, the control means changes the connection stored in the storage area of the monitoring terminal information of the exchange connection candidate. The network monitoring system according to claim 5, wherein the monitoring terminal information corresponding to the power monitoring terminal is discarded, and the connection of the monitoring terminal whose connection is to be changed is allowed in the next priority order.

  The present invention relates to a redundant configuration of a plurality of monitoring devices that allow a plurality of monitored devices on a monitored network to be monitored from a plurality of monitoring terminals, respectively, in order to perform important operations without delaying or stopping operations. It is applicable to a network monitoring system provided with

1 is a block diagram showing a configuration of a system according to an embodiment of the present invention. The block diagram which shows the structure of the monitoring apparatus and monitoring terminal in FIG. When a failure occurs in the monitoring device (# 3) and when the failure is recovered, the state transition of the connection allocation of the monitoring terminal is shown. An example of the other system ID table in a monitoring apparatus is shown. An example of the priority table in a monitoring apparatus is shown. An example of the priority table in a monitoring apparatus is shown. An example of the priority table in a monitoring apparatus is shown. An example of the priority table in a monitoring apparatus is shown.

Explanation of symbols

1 Network Monitoring System 2 Monitored Network 3 Monitored Device (Monitored Device)
4 monitoring terminal 5 monitoring device 6 monitoring terminal connection network 7 monitoring device interconnection network 8 monitored device connection network 41 communication unit 42 reconnection processing unit 51 communication unit 52 failure detection function unit 53 priority table 54 terminal connection management unit 55, etc. System ID table 56 Protection time table

Claims (5)

A network monitoring system comprising a plurality of systems of monitoring devices in a redundant configuration that respectively monitor a plurality of monitored devices existing in a monitored network from a plurality of monitoring terminals;
When any of the plurality of monitoring devices becomes inoperable, the plurality of monitoring terminals under the inoperable system monitoring device are subordinate to the operable system monitoring device according to a preset priority. A network monitoring system provided in each of the plurality of monitoring devices with a control means for changing connection. The control means, when changing the connection of the plurality of monitoring terminals under the monitoring device of the inoperable system to the subordinate of the monitoring device of the operable system in the order of high priority of the priority, 2. The connection of the monitoring terminal having a lower priority than the monitoring terminal connected to the monitoring device of the inoperable system is disconnected by comparing with the priority of each of the plurality of monitoring terminals connected to the monitoring device. The network monitoring system described. For each identification information of each monitoring terminal, the plurality of storage means having storage areas for priority information indicating the priority, connection status information with the monitoring device, connection monitoring device information, and monitoring terminal information of exchange connection candidates The network monitoring system according to claim 1, further comprising a system monitoring device. The control means places the plurality of monitoring terminals subordinate to the inoperable system monitoring device under the priority of the priority high priority order based on the storage information of the storage means. When changing the connection, the priority is lower than the priority of each of the plurality of monitoring terminals connected to the monitoring device of the operable system, and the priority is lower than the monitoring terminal connected to the monitoring device of the inoperable system In order to enter a state in which a connection change request is received from a high-priority monitoring terminal connected to the inoperable system monitoring device while disconnecting the monitoring terminal under the operable system monitoring device The network monitoring system according to claim 3, wherein the connection status information, the connection monitoring device information, and the monitoring terminal information of the exchange connection candidate in the means are rewritten. When the monitoring device of the inoperable system is restored to an operable state, the control means of the recovery monitoring device includes identification information of the monitoring terminal in the storage means, priority information indicating the priority, and connection status information The network monitoring system according to claim 4, wherein, according to the high priority order of the priorities, the monitoring terminal in a disconnected state is permitted to connect up to a prescribed number of connections.

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