JP2008305159A - Redundant configuration server system, network management system, method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a redundant configuration server system capable of preventing the notification omission of a status report transmitted from the redundant configuration server system. <P>SOLUTION: An alarm management function part 40 collects fault information when an event is detected. An alarm management function part 41 collects fault information when the event is detected and sends the collected fault information to the alarm management function part 40 through inter-server communication function parts 60, 61. The alarm management function part 40 transmits a trap message from an SNMP processing function part 30 to an EMS 100 on the basis of the collected fault information or the fault information received from the alarm management function part 41. If a response can not be received from the EMS 100 until timer expiration in a timer management function part 50, the alarm management function part 40 reads out the information of a trap message creation source from a trap management table 70 and resends the trap message from the SNMP processing function part 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a redundant configuration server system, and more particularly to a redundant configuration server system having an active server and a standby server. The present invention also relates to a network management system, method, and program, and more particularly, to a network management system, method, and program for performing status management of a redundantly configured server system.

  SNMP (Simple Network Management Protocol) is known as a network management protocol. In SNMP, an SNMP message is transmitted and received between a management target NE (Network Element) as an agent and an EMS (Element Management System) as an SNMP manager, thereby realizing network management. As an SNMP message, there is a trap message used when a notification such as a state change is voluntarily sent from the agent side. For example, when an event such as the occurrence of a failure is detected at the NE, the NE sends a trap message to the EMS and notifies the manager of the occurrence of the failure.

  Here, in the network management system, there is a possibility that the trap transmitted from the NE does not reach the EMS side. This is because NE normally does not have a trap retransmission function, and SNMP is a protocol on UDP (User Data Protocol), so that a message transmitted from the message transmission side is reliably transmitted to the communication partner. This is because there is no guarantee that it will arrive.

  When the trap omission occurs, it becomes impossible to accurately grasp the NE state on the EMS side. Therefore, the network management system needs a function for preventing trap loss. Regarding the prevention of trap omission, technologies for detecting an omission of traps on the EMS side are described in Patent Literature 1 and Patent Literature 2. In the techniques described in these documents, a state confirmation command for notifying the current device state (failure information) to the EMS is used. When the EMS detects a missing trap, the EMS issues a status confirmation command to the redundant configuration server system that is the NE, and performs state matching with the redundant configuration server system.

As a technique for detecting trap omission on the NE side and retransmitting the trap from the NE side, there is a technique described in Patent Document 3. In Patent Document 3, the NE starts a trap monitoring timer, and determines whether or not a response to the trap has been received from the EMS side after transmission of the trap. If a trap response cannot be received from the EMS side before the predetermined time elapses, the target trap is searched and the trap is retransmitted to the EMS.
JP 2003-244142 A JP 2001-160013 A Japanese Patent Laid-Open No. 10-51476

  By the way, in general, a server system that is required to continue a service provided by a system even when a failure occurs in the server employs a redundant configuration including an active system and a standby system. In a redundantly configured server system, if a failure occurs in the active server, the service can be continued by immediately switching to the standby server. At this time, it is necessary to promptly notify the maintenance person that a failure has occurred. An SNMP trap message can be used for notification of failure occurrence.

  When the techniques described in Patent Document 1 and Patent Document 2 are to be applied to management of a redundant server system, there are the following problems. In other words, if a failure occurs and is restored in the redundant configuration server system while a trap from the redundant configuration server system cannot be received for a certain period of time due to a network failure or the like, the redundant configuration server on the EMS side Unable to detect that the system has failed. This is because failure information cannot be acquired from the server switched to the active system even if the status confirmation command is used. In addition, since these techniques are configured to detect missing traps with EMS, there is also a problem in the redundant server system that management information necessary for trap retransmission must be kept.

  In Patent Document 3, a trap omission is detected on the NE side, that is, on the SNMP agent side. In Patent Document 3, when a failure occurs in the active server, the operational server transmits a trap and then receives a trap response from the EMS. However, in a redundantly configured server system, after a failure occurs, the server used for operation is switched from the active server to the standby server, and the active server is disconnected from the system, so that it becomes impossible to receive a trap response from the EMS. Thus, Patent Document 3 does not assume a redundant server system in which system switching occurs in the agent, and the technique described in Patent Document 3 cannot be applied to the redundant server system as it is.

  It is an object of the present invention to provide a redundant configuration server system, a network management system, a method, and a program that can prevent an omission of a status notification transmitted from the redundant configuration server system.

  In order to achieve the above object, a redundantly configured server system of the present invention according to the present invention is a redundantly configured server system having an active server and a standby server, wherein each of the active server and the standby server is an event. Upon receiving a detection notification, an alarm management function unit that collects information on the event, a communication processing function unit that communicates with a manager device that receives a status notification from the redundant server system, and a timer expires after a predetermined time has elapsed. A timer management function unit having a timer to be generated, and an inter-server communication function unit that performs communication between the active server and the standby server, and the alarm management function unit of the standby server is configured to receive an event detection notification. The collected information is transmitted to the alarm management function unit of the active server via the inter-server communication function unit. The alarm management function unit of the active server generates information of a status notification message creation source based on the collected information or information received from the alarm management function unit of the standby server, and the generated state The notification message creation source information is transferred to the communication processing function unit, and the communication processing function causes the status notification message to be transmitted to the manager device, and the status notification message creation source information is stored in the status notification management table. The timer of the timer management function unit is operated, and it is determined whether or not a response to the status notification message has been received from the manager device before the timer expires. Information of the notification message creation source is extracted, and the extracted information is used as the communication processing function unit. Passing, characterized in that to transmit the status notification message from the communication processing function unit to the manager device.

  The network management system of the present invention is a network management system including a redundant configuration server system having an active server and a standby server, and a manager device that receives a status notification from the redundant configuration server system, wherein the active server, When each of the standby servers receives an event detection notification, an alarm management function unit that collects information related to the event, a communication processing function unit that communicates with the manager device, and a timer that expires after a predetermined time elapses A timer management function unit having a timer to be generated, and an inter-server communication function unit that performs communication between the active server and the standby server, and the alarm management function unit of the standby server is configured to receive an event detection notification. The collected information is sent to the active server via the inter-server communication function unit. The alarm management function unit of the active server transmits the information of the status notification message creation source based on the collected information or the information received from the alarm management function unit of the standby server. Generating, passing the generated information to the communication processing function unit, causing the communication processing function unit to transmit a status notification message to the manager device, and storing the status notification message creation source information in the status notification management table The timer of the timer management function unit is operated, and it is determined whether or not a response to the status notification message has been received from the manager device before the timer expires. Information of the status notification message creation source is extracted from the communication processing function To pass, and wherein the status notification message from the communication processing function unit be sent to the manager device.

  The network management method of the present invention is a network management method for managing a redundantly configured server system having an active server and a standby server by a manager device connected to the redundantly configured server system via a network. Receiving the event detection notification, collecting information related to the event, the standby server passing the collected information to the active server, and the active server from the standby server Creating a status notification message based on the passed information, transmitting the created status notification message to the manager device, and a retransmission timer for causing the timer to expire when the active server has passed a predetermined time. The information of the status notification message creation source is stored in the status notification management table. Storing the information in a message, determining whether or not the active server has received a response to the transmitted status notification message before the retransmission timer expires, and the active server includes the retransmission timer. If it is determined that the response cannot be received before the time expires, information on the generation source of the status notification message is extracted from the status notification management table, a status notification message is created based on the extracted information, and transmitted to the manager device And a step of performing.

  The program of the present invention is a program for causing a redundant configuration server system having an active server and a standby server to execute a process of transmitting a status notification to a manager device connected to a network. When the standby server receives an event detection notification, the standby server collects information on the event, the standby server passes the collected information to the active server, and the active server Creates a status notification message based on the information delivered from the standby server, sends the created status notification message to the manager device, and the active server generates a timer expiration when a predetermined time elapses The retransmission timer is activated, and the status notification message creation source information is stored in the status notification management table. Processing to determine, whether the active server has received a response to the transmitted status notification message before the retransmission timer expires, and the active server has expired the retransmission timer. If it is determined that the response cannot be received by the time, information on the status notification message creation source is extracted from the status notification management table, a status notification message is generated based on the extracted information, and transmitted to the manager device; Is executed.

  In the redundant configuration server system, the network management system, the method, and the program of the present invention, it is possible to prevent omission of notification of the status notification transmitted from the redundant configuration server system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an overview of a network management system according to an embodiment of the present invention. The network management system includes a redundant configuration server system 10 that is an NE (Network Element) that performs communication, and an EMS (Element Management System) 100 that manages a plurality of NEs. The redundant configuration server system 10 and the EMS 100 are connected via the IP network 200. The protocol used when the EMS 100 manages the NE is SNMP (Simple Network Management Protocol).

  The redundant configuration server system 10 includes an active server 20 and a standby server 21. When the active server 20 is stopped due to a server failure or the like, the redundant configuration server system 10 performs system switching and continues the service using the standby server 21 as a new active system. When an event such as the occurrence of a failure is detected, the redundant configuration server system 10 sends a status notification to the EMS 100 that is a manager. By notifying the EMS 100 of the failure occurrence status or the like by the status notification, the failure in the redundant configuration server system 10 can be grasped on the EMS 100 side.

  The active server 20 includes an SNMP processing function unit (communication processing function unit) 30, an alarm management function unit 40, a timer management function unit 50, an inter-server communication function unit 60, and a trap management table 70. The SNMP processing function unit 30 transmits / receives an SNMP message to / from the EMS 100. In the SNMP message exchanged between the redundant server system 10 and the EMS 100 by the SNMP processing function unit 30, the agent (redundant server system 10) voluntarily notifies the manager (EMS 100) of the state change "Trap. Is included. In addition, “Get Request” and “Get Next Request” for requesting object information acquisition from the manager to the agent, “Set Request” for requesting information change, “Get Response” as a response from the agent to these, etc. There is.

  The alarm management function unit 40 manages event information such as the occurrence of a failure. When an event such as a failure occurs in the active server 20, the alarm management function unit 40 collects information related to the event that has occurred and generates information necessary to create a status notification message (trap message). Thereafter, the information on the source of the trap message is delivered to the SNMP processing function unit 30, and the trap message is transmitted from the SNMP processing function unit 30 to the EMS 100. The timer management function unit 50 manages the trap retransmission timer. The inter-server communication function unit 60 performs communication between the active server 20 and the standby server 21. The trap management table 70 stores information necessary for retransmission of the trap message, that is, information of the trap message creation source.

  The standby server 21 includes an SNMP processing function unit 31, an alarm management function unit 41, a timer management function unit 51, an inter-server communication function unit 61, and a trap management table 71. The function of each unit in the standby server 21 is the same as the function of each unit in the active server 20. However, when an event such as a failure occurs in the standby server 21, the alarm management function unit 41 collects information regarding the generated event, and the collected failure information is transmitted via the inter-server communication function units 60 and 61. Then, the alarm management function unit 40 of the active server 20 is notified. The alarm management function unit 40 of the active server 20 generates trap message creation source information based on the information received from the alarm management function unit 41 of the standby server 21 and transmits the trap message to the SNMP processing function unit 30. Let In this way, all information such as the occurrence of a failure occurring in each device in the redundant server system 10 is transferred to the active server 20 and is centrally managed by the alarm management function unit 40 of the active server 20.

  When the service of the active server 20 is stopped and system switching occurs, the standby server 21 continues the service as a new active system. During system switching, memory replication (memory synchronization) is performed between the active system and the standby system. Specifically, failure information managed by the alarm management function unit 40, trap message creation source information stored in the trap management table 70, and trap retransmission timer information set by the timer management function unit 50 Are replicated in the alarm management function unit 41, the trap management table 71, and the timer management function unit 51 of the standby server 21, respectively. After the system switchover, the alarm management function unit 41 of the standby server 21 that has become the new operation system operates by taking over the processing of the alarm management function unit 40 of the operation server 20 that is the old operation system.

  Here, in SNMP, information is exchanged between a manager and an agent using a management information base called MIB (Management Information Base). In this embodiment, the MIB object used by the redundant configuration server system 10 includes a sequence number “SN (Sequence Number)” that is a continuous number, a “reception SN” that represents a sequence number that the EMS 100 has confirmed reception, Information of the detected event (occurrence time, detection device, message importance, message content), and the like.

  FIG. 2 shows an operation procedure at the time of trap transmission in the redundantly configured server system. When an event such as the occurrence of a failure is detected in the active server 20 by a process or the like operating on the active server 20, an event detection is notified to the alarm management function unit 40 (step S1). Upon receiving the event detection notification, the alarm management function unit 40 collects failure information regarding the event that has occurred. Further, a sequence number SN that is a consecutive number to be assigned to the trap is generated. The alarm management function unit 40 generates trap message generation source information based on the collected failure information and the sequence number SN. This trap message creation source information includes a sequence number SN, an event occurrence time, a detection device, a message importance, a message content, and the like.

  When the standby server 21 detects an event, the alarm management function unit 41 in the standby server 21 receives the event detection notification and collects failure information regarding the event that has occurred. The alarm management function unit 41 passes the collected failure information to the alarm management function unit 40 in the active server 20 via the inter-server communication function units 60 and 61. The alarm management function unit 40 generates a sequence number SN common to the event detection in the active server 20 even for the event detected in the standby server 21. The alarm management function unit 40 generates trap message creation source information based on the generated sequence number SN and the failure information received from the standby server 21 side.

  When the alarm management function unit 40 generates trap message creation source information, the alarm management function unit 40 stores the generated trap message creation source information in the trap management table 70 (step S2). Further, a trap retransmission timer is set in the timer management function unit 50 (step S3), and the trap retransmission timer is operated. For identification of the trap in the trap management table 70, the sequence number SN assigned by the alarm management function unit 40 can be used. In setting the trap retransmission timer in the timer management function unit 50, the sequence number SN assigned to the trap message can be used as an ID for identifying the trap.

  The alarm management function unit 40 passes the trap message creation source information to the SNMP processing function unit 30. The SNMP processing function unit 30 creates a trap message based on the trap message creation source information received from the alarm management function unit 40, and transmits the trap message to the EMS 100 (step S4). When receiving the trap message, the EMS 100 transmits a Set Request message to the redundant configuration server system 10 as a trap reception response. At that time, the EMS 100 includes the sequence number SN extracted from the received trap message in the Set Request message as the received SN.

  The redundant configuration server system 10 waits for reception of a Set Request from the EMS 100. The alarm management function unit 40 determines whether or not the trap retransmission timer has expired before receiving the Set Request (step S5). When the trap retransmission timer expires before receiving the Set Request, it is determined that a trap has been lost, and information on the trap message creation source related to the trap is acquired from the trap management table 70 (step S6). Thereafter, the timer management function unit 50 resets the trap retransmission timer (step S7), and the SNMP processing function unit 30 retransmits the trap message (step S8).

  If a Set Request is received from the EMS 100 before the trap retransmission timer expires (step S9), since the trap reception at the EMS 100 has been confirmed, the alarm management function unit 40 uses the trap message creation source information as a trap. Information is deleted from the management table 70 (step S10). In the deletion of the trap message creation source information, the received SN included in the Set Request message is used as an ID, and the trap message creation source information stored in the trap management table 70 includes a sequence number SN that matches the received SN. The trap message creation source information is deleted from the trap management table 70. The amount of information stored in the trap management table 70 can be reduced by deleting the information about the trap message for which the trap reception has been confirmed by the EMS 100 from the trap management table.

  In addition, the alarm management function unit 40 cancels the trap retransmission timer in the timer management function unit 50 (step S11). In releasing the trap retransmission timer, the received SN is used as an ID to identify the corresponding trap. Thereafter, the alarm management function unit 40 transmits a Get Response message in which the reception SN is set as a response to the received Set Request by the SNMP processing function unit 30 (step S12). The processing ends when the EMS 100 receives the Get Response message as a response to the transmitted Set Request message. Note that the Get Response message from the redundant server system 10 side can be omitted. In that case, the network load can be reduced.

  The redundant configuration server system 10 synchronizes the data held by the active server 20 and the data held by the standby server 21 periodically in preparation for system switching in parallel with the processing shown in FIG. Process. The synchronization processing includes an alarm management function unit 40, a timer management function 50, and a trap management table 70 in the active server 20, an alarm management function unit 41, a timer management function unit 51 in the standby server 21, And the process which each synchronizes with the trap management table 71 is included. In the synchronization of the alarm management function units 40 and 41, the timer management functions 50 and 51, and the trap management tables 70 and 71, all data may be matched before system switching, and only a part of the data is stored. May be synchronized, and the remaining data may be synchronized upon system switching. Alternatively, the configuration may be such that synchronization is performed at the time of system switching without performing synchronization processing in advance.

  When a failure occurs in the active server 20, the redundant server system 10 performs system switching, and the standby server 21 becomes the new active server. After system switching, the alarm management function unit 41 of the standby server 21 that is a new active system, when the timer management function unit 51 has an active trap retransmission timer, waits until the trap retransmission timer expires until the timer expires. To determine whether or not the Set Request message has been received. When it is received, the information of the trap message creation source of the corresponding trap is deleted from the trap management table 71, and a Get Response message is transmitted to the EMS 100. As described above, the alarm management function unit 41 of the standby server 21 operates by taking over the processing of the alarm management function unit 40 of the active server 20, and thus the trap transmitted before the system switchover after the system switchover has occurred. It is possible to determine whether the message has reached the EMS 100.

  Note that the redundant configuration server system 10 confirms communication with the EMS when transmitting an SNMP message to the EMS 100. FIG. 3 shows an operation procedure when confirming communication with the EMS. When there is an SNMP message transmission request to the EMS 100 (step S100), the SNMP processing function unit 30 determines whether communication with the EMS 100 is possible (step S101). Specifically, the SNMP processing function unit 30 sends the trap message to the EMS 100 when transmitting the trap message in step S4, when retransmitting the trap message in step S8, and when transmitting the Get Response message in step S12. To determine whether or not communication is possible. Whether or not communication is possible is determined based on whether or not there is a response from the EMS 100 using, for example, a ping command.

  If the SNMP processing function unit 30 determines that communication with the EMS 100 is possible, the SNMP processing function unit 30 transmits an SNMP message to the EMS 100 (step S102). That is, the trap message transmitted in steps S4 and S8 or the Get Response message transmitted in step S12 is transmitted. When the SNMP processing function unit 30 cannot communicate with the EMS 100, the SNMP processing function unit 30 performs communication confirmation (step S103), returns to step S101, and does not perform an SNMP message until communication with the EMS 100 is possible. By doing in this way, it is possible to prevent the SNMP message from being transmitted to the EMS 100 when communication with the EMS 100 is not possible, and the network load can be reduced.

  FIG. 4 shows a sequence of SNMP messages transmitted / received between the redundant configuration server system 10 and the EMS 100. When an event such as the occurrence of a failure is detected, the redundant server system 10 collects failure information, and the trap in which the sequence number “SN = 1” is set in the EMS 100 by the alarm management function unit 40 of the active server 20 A message is transmitted (step S200). At this time, the trap message creation source information of the sequence number “SN = 1” is stored in the trap management table 70. Further, a trap retransmission timer is set for the sequence number “SN = 1” in the timer management function unit 50.

  When receiving the trap message, the EMS 100 generates an SNMP Set Request message in which the reception confirmation sequence number “Reception SN = 1” is set as a trap reception response, and transmits the SNMP Set Request message to the redundant configuration server system 10 (Step S201). The redundant configuration server system 10 recognizes that the trap of “SN = 1” has correctly reached the EMS 100 by receiving the Set Request message. Thereafter, the information on the corresponding trap “SN = 1” is deleted from the trap management table 70. The timer management function unit 50 cancels the trap retransmission timer. The alarm management function unit 40 transmits a Get Response in which the reception confirmation sequence number “Reception SN = 1” is set as a response to the Set Request received from the EMS 100 (Step S202).

  Subsequently, when another event is detected in the redundant configuration server system 10, the alarm management function unit 40 transmits a trap message in which the sequence number “SN = 2” is set to the EMS 100 (step S203). The trap message creation source information of the sequence number “SN = 2” is stored in the trap management table 70, and the timer management function unit 50 sets the trap retransmission timer for “SN = 2”. = 1 ”trap. When the trap message “SN = 2” cannot be received by the EMS 100 for some reason such as a network failure, the redundant server system 10 does not receive a Set Request message from the EMS 100. In this case, in the timer management function unit 50, the trap retransmission timer set to the sequence number “SN = 2” expires (step S204).

  When the trap retransmission timer expires for the trap of “SN = 2”, the alarm management function unit 40 reads information necessary for trap retransmission from the trap management table 70, and stores the corresponding trap “SN = 2” in the EMS 100. Transmit (step S205). In addition, the timer management function unit 50 resets the trap retransmission timer of “SN = 2”. When receiving the trap message “SN = 2”, the EMS 100 transmits, as a response, the SNMP Set Request message in which the reception confirmation sequence number “Reception SN = 2” is set to the redundant configuration server system 10. (Step S206).

  The redundant server system 10 receives the Set Request message with the reception confirmation sequence number “Reception SN = 2” to confirm that the retransmitted trap message with the sequence number “SN = 2” has been correctly received by the EMS 100. recognize. Thereafter, the information of the corresponding trap “SN = 2” is deleted from the trap management table 70, and the timer management function unit 50 releases the trap retransmission timer. Further, as a response to the Set Request received from the EMS 100, a Get Response in which the reception confirmation sequence number “Reception SN = 2” is set is transmitted (Step S207).

  Consider a case where system switching occurs after the transmission of the trap message “SN = 2” in step S203. The trap management table 71 of the standby server 21 stores the same information as the trap management table 70 of the active server 20 by the synchronization process during system switching or the synchronization process during system switching. That is, the trap management table 71 stores trap message creation source information for the sequence number “SN = 2”. Further, the timer management function unit 51 of the standby server 21 receives the “SN” set in the timer management function unit 51 of the active server 20 by the synchronization process during system switching or the synchronization process during system switching. = 2 "is set as the trap retransmission timer.

  After the system switchover, the alarm management function unit 41 takes over the processing of the alarm management function unit 40 of the active server 20 which is the old active system, and retransmits the trap for “SN = 2” set in the timer management function unit 51. Determine if the timer has expired. When the trap retransmission timer expires, the alarm management function unit 41 reads the trap message creation source information for the sequence number “SN = 2” from the trap management table 71 and retransmits the trap. In addition, the trap management timer 51 resets the trap retransmission timer for “SN = 2”. As described above, the information about the trap transmitted from the active server 20 is taken over to the standby server 21 that has newly become the active system, so that even when system switching occurs after the trap transmission, the EMS 100 Traps can be retransmitted for traps that cannot receive the Set Request message, which is a reception response to the.

  In the present embodiment, the redundant configuration server system 10 itself, which is an NE, is provided with a function of detecting missing traps. Thereby, the reliability of trap transmission can be ensured and the reliability of trap reception in the EMS 100 can be improved. Further, by transmitting information related to the detected event from the standby server 21 to the active server 20 using the inter-server communication function, the alarm management function unit 40 of the active server 20 can provide information such as the occurrence of a failure. Centralized management. In this embodiment, when system switching occurs, the information managed by the active server 20 is taken over by the standby server 21, and the alarm management function unit 41 of the standby server 21 receives the alarm of the active server 20. The operation of the management function unit 40 is taken over. In this way, the trap message transmitted before the system switchover can also be managed by the standby server 21 that has become the active system by the system switchover.

  In the present embodiment, unlike the trap missing detection method led by the manager in the related art, the EMS 100 can reliably detect the occurrence of a failure in the redundant configuration server system 10 by the trap. For this reason, it is not necessary to perform state alignment by the state confirmation command from the EMS 100 side. Therefore, the trap omission can be detected only by the SNMP protocol between the EMS 100 and the redundant configuration server system 10. In addition, when the SNMP message is transmitted, communication between the redundant configuration server system 10 and the EMS 100 is confirmed, and the SNMP message is transmitted when communication is possible, so that useless message transmission can be avoided. The load can be reduced.

  In the above embodiment, one trap transmission destination EMS is used, but a trap message may be transmitted to a plurality of EMSs. In this case, in step S3 (FIG. 2), a trap retransmission timer may be set for each EMS that is a trap message transmission destination. In step S5, it is determined whether or not the trap retransmission timer corresponding to each EMS has expired. When reception responses (Set Request messages) have been received from all the EMSs before the trap retransmission timer expires, In S10, the trap message creation source information may be deleted from the trap management table 70. If there is an EMS that cannot receive a reception response before the trap retransmission timer expires, the trap retransmission timer corresponding to the EMS is reset in step S7, and a trap message is sent to the EMS in step S8. Just re-send.

  Although the present invention has been described based on the preferred embodiment, the redundant configuration server system, network management system, method, and program of the present invention are not limited to the above embodiment, and Various modifications and changes from the configuration of the examples are also included in the scope of the present invention.

The block diagram which shows the structure of the network management system of one Example of this invention. The flowchart which shows the operation | movement procedure at the time of the trap transmission in a redundantly configured server system. The flowchart which shows the operation | movement procedure at the time of performing communication confirmation with EMS. The figure which shows the sequence of an SNMP message.

Explanation of symbols

10: Redundant configuration server system 20: Active server 21: Standby server 30, 31: SNMP processing function unit 40, 41: Alarm management function unit 50, 51: Timer management function unit 60, 61: Inter-server communication function unit 70 71: Trap management table 100: EMS
200: IP network

Claims (18)

A redundantly configured server system having an active server and a standby server,
Communication in which each of the active server and the standby server performs communication between an alarm management function unit that collects information related to the event upon receiving an event detection notification and a manager device that receives a status notification from the redundantly configured server system A processing function unit, a timer management function unit having a timer for generating a timer expiration after a lapse of a predetermined time, and an inter-server communication function unit that performs communication between the active server and the standby server,
When the alarm management function unit of the standby server receives the event detection notification, the collected information is transmitted to the alarm management function unit of the active server via the inter-server communication function unit,
The alarm management function unit of the active server generates information of a status notification message creation source based on the collected information or information received from the alarm management function unit of the standby server, and the generated status notification Passing information of the message creation source to the communication processing function unit, causing the communication processing function to send a status notification message to the manager device, storing the status notification message creation source information in a status notification management table, and The timer of the management function unit is operated, and it is determined whether or not a response to the status notification message has been received from the manager device before the timer expires. If the response cannot be received, the status notification is sent from the status notification management table. The information of the message creation source is extracted, and the extracted information is received by the communication processing function unit. Pass, redundant server system, characterized in that to transmit the status notification message from the communication processing function unit to the manager device.   Information on the alarm management function unit, timer management function unit, and status notification management table of the active server, and information on the alarm management function unit, timer management function unit, and status notification management table of the standby server The redundantly configured server system according to claim 1, which performs synchronization processing.   The alarm management function unit of the standby server operates by taking over the processing of the alarm management function unit of the active server before system switching after the standby server becomes an active server by system switching. 2. The redundantly configured server system according to 2.   When the alarm management function unit of the active server receives a response to the status notification message before the timer of the timer management function unit expires, the alarm management function unit deletes information related to the status notification message from the status notification management table. The redundantly configured server system according to any one of claims 1 to 3, wherein the timer management function unit cancels the setting of the timer.   The redundant configuration according to any one of claims 1 to 4, wherein the alarm management function unit of the active server generates a sequence number and assigns the sequence number to the information of the status notification message creation source. Server system.   The communication processing function unit of the active server determines whether communication with the manager device is possible when transmitting the status notification message, and determines that communication is possible, the status notification The redundantly configured server system according to any one of claims 1 to 5, which transmits a message.   When the alarm management function unit of the active server receives a response to the status notification message before the timer of the timer management function unit expires, a message indicating confirmation of reception of the response is received via the communication processing function unit. The redundant configuration server system according to any one of claims 1 to 6, wherein the server device is transmitted to the manager device. A network management system having a redundant configuration server system having an active server and a standby server, and a manager device that receives a status notification from the redundant configuration server system,
When each of the active server and the standby server receives an event detection notification, an alarm management function unit that collects information about the event, a communication processing function unit that communicates with the manager device, and a predetermined time A timer management function unit having a timer for generating a timer expiration after elapses, and an inter-server communication function unit for performing communication between the active server and the standby server,
When the alarm management function unit of the standby server receives the event detection notification, the collected information is transmitted to the alarm management function unit of the active server via the inter-server communication function unit,
The alarm management function unit of the active server generates information of a status notification message creation source based on the collected information or the information received from the alarm management function unit of the standby server, and the generated information is Passing to the communication processing function unit, causing the communication processing function unit to transmit a status notification message to the manager device, storing information of the status notification message creation source in a status notification management table, and a timer of the timer management function unit To determine whether or not a response to the status notification message has been received from the manager device before the timer expires, and when the response cannot be received, information on the status notification message creation source from the status notification management table. And passes the extracted information to the communication processing function unit. Network management system characterized in that to further transmit the status notification message to the manager device. A network management method for managing a redundant server system having an active server and a standby server by a manager device connected to the redundant server system via a network,
When the standby server receives an event detection notification, collecting information related to the event;
The standby server delivers the collected information to the active server;
The active server creates a status notification message based on the information passed from the standby server, and sends the created status notification message to the manager device;
The active server operates a retransmission timer that generates a timer expiration when a predetermined time elapses, and stores information on the status notification message creation source in a status notification management table;
Determining whether the active server has received a response to the transmitted status notification message before the retransmission timer expires;
If the active server determines that the response cannot be received before the retransmission timer expires, the status notification message generation source information is extracted from the status notification management table, and the status notification message is based on the extracted information. And a step of transmitting to the manager device. When the operational server receives an event detection notification, collects information about the event, creates a status notification message based on the collected information, and transmits the created status notification message to the manager device;
The network management method according to claim 9, further comprising a step in which the active server operates the retransmission timer and stores information of the status notification message creation source in a status notification management table.   The step of synchronizing the information on the retransmission timer and status notification management table in the active server and the information on the retransmission timer and status notification management table in the standby server is included. Or the network management method according to 10.   12. The standby server operates by taking over the operation of the retransmission timer and the process of creating the status notification message in the active server before system switching after becoming the active server by system switching. The network management method described in 1.   The operational server, when receiving a response to the status notification message before the retransmission timer expires, deletes information related to the status notification message from the status notification management table and cancels the retransmission timer setting. The network management method as described in any one of -12.   The network management method according to claim 9, wherein the active server generates a sequence number of a serial number and assigns the sequence number to the status notification message.   The operational server determines whether or not communication with the manager device is possible when transmitting the status notification message, and when determining that communication is possible, transmits the status notification message. The network management method as described in any one of Claims 9-14.   The operational server, when receiving a response to the status notification message before the retransmission timer expires, transmits a response indicating reception confirmation of the response to the manager device. The network management method described. A program that causes a redundant configuration server system having an active server and a standby server to execute a process of transmitting a status notification to a manager device connected to a network, the redundant configuration server system including:
When the standby server receives an event detection notification, it collects information about the event;
A process in which the standby server delivers the collected information to the active server;
The operational server creates a status notification message based on information passed from the standby server, and transmits the created status notification message to the manager device;
The operational server operates a retransmission timer that generates a timer expiration when a predetermined time elapses, and stores the status notification message creation source information in the status notification management table;
A process of determining whether the active server has received a response to the transmitted status notification message before the retransmission timer expires;
If the active server determines that the response cannot be received before the retransmission timer expires, it extracts information on the status notification message creation source from the status notification management table, and generates a status notification message based on the extracted information. A program that causes a process to be created and transmitted to the manager device. In addition to the redundant configuration server system,
When the operational server receives an event detection notification, collects information about the event, creates a status notification message based on the collected information, and transmits the created status notification message to the manager device;
18. The program according to claim 17, wherein the active server causes the retransmission timer to operate and to store the status notification message creation source information in a status notification management table.

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