JPH11154950A - Network management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a network management system to surely manage detailed state information of a device to be managed between the network management system and the device to be managed in a network. SOLUTION: A Trap command issue section 202 sends MIB information that is simplified revision details of a device state to the network management device 100 when state of a device 200 to be managed is changed. When a Trap command analysis section 103 discriminates the necessity of issue of a Get command, a Get command issue section 104 sends the Get command to the device 200 to be managed. When a Get-response command sent from a Get- response processing section 204 of the device 200 to be managed is not received by a Get-response processing section 105 of the management system within a prescribed period, a Get-response reception processing management section 106 allows the Get command issue section 104 to issue the Get command again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network management apparatus which manages a state change of a network managed apparatus by using an SNMP (Simple Network Monitoring Protocol) protocol, and more particularly, to a network management apparatus and a network managed apparatus using an SNMP protocol. When a status change of the network managed device occurs between the network managed device and the network managed device after issuing a Trap command from the network managed device and issuing a Get command to the network managed device within a predetermined time, To
The present invention relates to a network management apparatus in which a Get command is issued from a network management apparatus to a network managed apparatus again when a Get-response is not received, so that detailed device state information of the network managed apparatus can be managed.

[0002]

2. Description of the Related Art Conventionally, in a network device that is connected through an information line between a network management device and a network managed device using an SNMP protocol and manages a change in the state of the network managed device, the status of the network managed device has been changed. When a change occurs, the network managed device transmits the status change information to the network management device in a Trap packet, and the network management device analyzes the Trap packet and detects the status change of the network managed device. I try to judge. However, since the lower protocol of the Trap packet is UDP / IP (User Datagram Protocol / Internet Protocol), communication confirmation between the network management device and the network managed device is not performed. When the Trap packet is not received, there is a problem that the network management device cannot manage the state change of the network managed device.

On the other hand, as a conventional similar technique relating to such a network management apparatus, for example, Japanese Patent Laid-Open Publication No. 06-350602 (hereinafter referred to as the first publication) discloses that the state management of network components is controlled by the network management apparatus. A monitoring information collection method is disclosed. In the case of the first publication, when a state change occurs in a component device in the network, summary information and detailed information of the occurrence of the status change are created in the component device in the network, and the summary information is notified to the network management device. Then, the detailed information is stored in the constituent devices in the network. The network management device displays a change in state on the display device based on the notified summary information, and when the network management device wants to obtain detailed information, the network management device requests detailed information from a component device in the network. Thus, the detailed information stored in the network management device is read, and the network management device notifies the network management device of the detailed information.

[0004] Thus, the network management device displays the details of the status change of the components in the network on the display device based on the notified detailed information. However, even in the case of the first publication, when the network management device wants to obtain the detailed information, even if the network management device requests the detailed information from the components in the network, the detailed information is not received by the network management device. No measures are disclosed for the case.

[0005] Japanese Patent Application Laid-Open No. 09-64 discloses a network device which is connected through an information line between a network management device and a network managed device using an SNMP protocol to manage a change in the state of the network managed device.
No. 871 (hereinafter, referred to as a second publication). In the case of the second publication, the manager sets the content and destination of the Trap packet in the Trap setting request unit,
When the set-request transmitting unit transmits the set-request packet to the agent, the agent sets the set-request received by the set-request receiving unit in the Trap setting unit.
The content and destination of the Trap packet included in the packet are detected, and the detected content is managed by the Trap management unit. In the agent, when the Trap packet is further acquired by the Trap acquisition unit, the Trap packet is transmitted from the Trap transmission unit to the manager based on the content managed by the Trap management unit.

[0006] By doing so, no data is transmitted from the agent to the manager not specified as the destination, so that the manager does not need the trap.
It is disclosed that the processing load on the manager is reduced without receiving a packet. In the case of the second publication, although the processing load on the manager can be reduced,
As in the first publication, there is no mention of measures taken when a Trap packet is not transmitted to the manager.

[0007] Further, Japanese Patent Application Laid-Open No. 09-101929 (hereinafter referred to as "third publication") discloses, as a network management device using SNMP, a Tr for notifying a management station of an event occurring in a managed node to a management station as a trap.
An ap transmission device is disclosed. In the case of the third publication, an MIB (management information base) for Trap reception confirmation is defined, and when the Trap is received, the management station indicates that the Trap reception confirmation MIB value for the received Trap has been received. Sends a set request request to set the value to the Trap transmission source, and after the Trap is transmitted by the managed node, monitors the MIB value for confirming the Trap reception for the transmission Trap. Tr when not set to a value
It is disclosed that retransmission processing of ap is performed.

[0008]

In each of the first and second publications, when the network management device does not receive a Trap packet, the network management device manages the state change of the network managed device. There is a problem that cannot be done. Further, in the case of the third publication, it is described that the Trap retransmission process is performed when the value is not set to the value indicating the reception after a predetermined time has elapsed. Does not disclose the technical idea of managing a change in the state of a network managed device on the network management device side when a Trap packet is not received from the network management device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. Even if there is a communication trouble between a network managed device and a network management device by the SNMP protocol, the network managed device can be used. An object of the present invention is to provide a network entry device that can more reliably manage state change information.

[0010]

In order to achieve the above object, a network management device according to the present invention is provided in a network managed device having an agent function of an SNMP protocol, and when a state change of the network managed device occurs. A network management device having an SNMP server function for performing network management is output, and a device status change occurrence notification determined is output, and at the same time, device status detailed information at the time of the device status change occurrence is stored in a device status storage provided in the network managed device. A device state monitoring unit to be stored in the memory, provided in the network managed device,
MIB in which the device status change notification output from the device status monitoring unit is input to simplify detailed device status information
A Trap command issuing unit that outputs information as a Trap command to the network management device; and a Trap command issuing unit that is provided in the network management device.
When a command is received, a Trap command analysis unit that analyzes MIB information of the Trap command and determines whether or not a request for device status detailed information is required from the network managed device is provided in the network management device. Said
When the Trap command analysis unit determines that a request for the device state detailed information is required, a Get command that receives an issuance request from the Trap command analysis unit and outputs a Get command to the corresponding network managed device based on the MIB information An issuing unit, provided in the network managed device,
The network managed device side Get-response which reads out the device status detailed information of the corresponding network managed device from the MIB information of the command from the device status storage memory and outputs a Get-response command to the network management device.
provided in the se command processing unit and the network management device, Get request information is notified from the Get command issuing unit, and Get-
Get-response for notifying the Get command issuing unit of a Get command re-request when there is no response command received
And a command reception management unit.

According to the network management device of the present invention, when a state change occurs in the network managed device,
Simplified MI indicating that a state change has occurred between the network management device and the network managed device
B is defined, the device status monitoring unit notifies the Trap command issuing unit, and at the same time, stores the device status detailed information at the time of the status change in the device status storage memory. Upon receiving the notification, the Trap command issuing unit transmits the Trap command to the network management device, and the Trap command is received by the network management device.
The Trap command is the Trap command analysis unit.
If the IB information is analyzed and it is determined that it is necessary to obtain detailed information on a change in the state of the network managed device, T
The rap command analyzing unit notifies the Get command issuing unit of a Get command issuing request as MIB information. The Get command issuing unit transmits a Get command to the network managed device having a status change based on the MIB information to the network managed device side Get-response command processing unit, and processes the network managed device Get-response command. Department Get
The device status detailed information is read from the device status storage memory from the MIB information of the command, and transmitted to the network management device as a Get-response command. Also, the Get-response command reception management unit receives the Get request information from the Get command issuing unit at the same time that the Get command issuance unit issues the Get command, and the network management device receives the Get-response within a predetermined time.
When the se command is not received, the Get-response command reception management unit outputs a Get command re-request to the Get command issuing unit.

[0012]

Next, an embodiment of a network management apparatus according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention. In FIG. 1, an SNM that performs network management
A network management device 100 having a P server function and a network managed device 200 having no managed device other than its own having an agent function of an SNMP protocol which is a management protocol of the network device have an information line A.
Connected by In the first embodiment, the network managed device that causes a change in the device state is the illustrated network managed device 200 for simplification of the description.

The network management device 100 includes a communication protocol processing unit 101. The network managed device 200 is also provided with a communication protocol processing unit 205. These two communication protocol processing units 101 and 2
Numeral 05 exchanges data with each other via the information line A. These two communication protocol processing units 101 and 2
05 is an SNMP packet transmission / reception process and TCP / I
It is a P packet processing unit.

In the network managed device 200,
The status change of the network managed device 200 is monitored by the device status monitoring unit 201. If any device status change of the network managed device 200 occurs, the device status monitoring unit 201 changes the status. That the status of the device negotiated with the network management device 100 has changed according to the content of the network management device 100.
The Trap command issuing unit 2 provided in the network managed device 200 so that the MIB information simplified to notify the network managed device 200 can be transmitted from the network managed device 200 to the network management device 100.
02 is notified. At the same time, the device status monitoring unit 201
The device status information at the time of occurrence of the device status change is stored in the device status storage memory 20 provided in the network managed device 200.
3 is kept.

The Trap command issuing unit 202 outputs a Trap command to the communication protocol processing unit 205 upon receiving the notification from the device status monitoring unit 201. The network managed device 200 is also provided with a network managed device side Get-response command processing unit 204. Get-respon on this network managed device side
The se command processing unit 204 transmits and receives data to and from the communication protocol processing unit 205. The se command processing unit 204 needs detailed information of a change in the device state of the network managed device 200 from the network management device 100, and receives a Get command. Is received by the network-managed device-side Get-response command processing unit 204 through the information line A and the communication protocol processing unit 205, and if the device state detailed information is stored in the device information storage memory 203, This detailed device state information is read and output to the communication protocol processing unit 205 as a Get-response command.

Next, the configuration of the network management device 100 will be described. Tr of the network managed device 200
The Trap command transmitted from the ap command issuing unit 202 is transmitted to the communication protocol processing unit 101 via the communication protocol processing unit 205 and the information line A. The fact that the Trap command has been received from the communication protocol processing unit 101 is notified to the Trap command receiving unit 102. Trap command receiving unit 102
Receives this notification and outputs a Trap command to the Trap command analysis unit 103.

The Trap command analysis unit 103 analyzes the MIB information of the Trap command, and
00 device status detailed information of the network managed device 20.
While determining whether it is necessary to order from 0,
If it is determined that it is not necessary to obtain the detailed device state information, the Trap command analysis unit 103 notifies the management application processing unit 107 of the Trap command, and the management application processing unit 107 performs processing for the conventional Trap command. It has become. If the Trap command analysis unit 103 determines that it is necessary to obtain the detailed device status information of the network managed device 200 from the network managed device 200, the Trap command analysis unit 10
3 notifies the Get command issuance request to the Get command issuance unit 104 as MIB information.

When the Get command issuing unit 104 receives a Get command issuing request, it issues a Get command and outputs it to the communication protocol processing unit 101. The communication protocol processing unit 101 is connected to the communication protocol processing unit 20 of the network managed device 200 through the information line A.
5, a Get command is transmitted to the network managed device side Get-response command processing unit 204.

From the network managed device side Get-response command processing unit 204 to the network managed device 200
The device status detailed information of the network management device side Get-resp through the communication protocol processing unit 205, the information line A and the communication protocol processing unit 101 of the network management device 100.
The information is input to the onse command processing unit 105. The network management device side Get-response command processing unit 105 notifies the management application processing unit 107 of the device status detailed information of the corresponding network managed device 200 by inputting the device status detailed information. . The management application processing unit 107 performs an SNMP agent, that is, a process related to overall monitoring and control of the network managed device 200.
Is based on the prior art, and a detailed description thereof will be omitted.

Further, the network management device 100 is provided with a Get-response command reception management unit 106, and the Get-response command reception management unit 106
Data is exchanged with the Get command issuing unit 104, and the Get command issuing unit 10 issues the Get command at the same time as the Get command issuing unit 104 issues the Get command.
4, the Get request information is notified to the Get-response command reception management unit 106. Simultaneously with the notification of the Get request information, the Get-response command reception management unit 106 serves as a timer, for example, a timer (not shown, but may be built in the Get-response command reception management unit 106 or may be a separate unit). Is started, and within the specified time set by the timer, Get-re
If the sponse command processing unit 105 does not receive a Get-response command, the network management device side Get-reponse
The Get-response command reception management unit 106 is notified from the sponse command processing unit 105 that the Get-response command is not received. This notification is Ge
When sent to the t-response command reception management unit 106,
The Get-response command reception management unit 106 requests the Get command issuing unit 104 to issue a Get command again.

Next, the operation of this embodiment configured as described above will be described. An MIB indicating that a state change has occurred between the network managed device 200 and the network management device 100 is defined. The device status monitoring unit 201 monitors the device status of the network managed device 200, and the network managed device 20
When a device status change occurs in device status 0, the device status monitoring unit 201 detects the device status change and notifies the Trap command issuing unit 202 of the change in the device status negotiated with the network management device 100 based on the change. .

Upon receiving the notification, the Trap command issuing unit 202 receives the simplified MIB without the detailed device state information.
Communication protocol processing unit 205 using information as a Trap command
Issue to By simplifying this Trap command,
Data volume can be reduced. At the same time, the device status monitoring unit 201 causes the device status storage memory 203 to store the detailed device status information at the time when the network managed device 200 changes the device status.

The communication protocol processing unit 205 converts the Trap command input from the Trap command
To the communication protocol processing unit 101 of the network management device 100, the communication protocol processing unit 101 transmits the received Trap command to the Trap command receiving unit 102, and the Trap command receiving unit 102
Transmit to the Trap command analysis unit 103. The Trap command analysis unit 103 analyzes the MIB information of the Trap command by inputting the Trap command, and as a result of the analysis, is a Trap command of a state change from the SNMP agent, that is, from the network managed device 200. It is determined whether it is necessary to get detailed information.

As a result of this determination, the Trap command analyzer 10
3 determines that there is no need to obtain detailed information, the Trap command analysis unit 103 sends the Trap command to the management application processing unit 107 in order to perform processing for a conventional, in other words, a normal Trap command. Notify. Thereby, the management application processing unit 107
Executes a predetermined process according to the Trap command, and executes management of the network managed device 200.

The Trap command analysis unit 103 obtains detailed device state information of the network managed device 200.
If it is determined that it is necessary to execute the command, the Trap command analyzing unit 103 notifies the Get command issuing unit 104 of a Get command issue request as MIB information. The Get command issuance unit 104 receives the corresponding network managed device (in this embodiment, the network managed device 2 based on the MIB information received from the Trap command analysis unit 103).
(Which corresponds to 00) is issued, and a Get command is issued to the communication protocol processing unit 101 and transmitted. This Get command is sent from the communication protocol processing unit 101 to the network managed device side Get-re through the information line A and the communication protocol processing unit 205 of the network managed device 200.
This is transmitted to the sponse command processing unit 204.

Upon receiving the Get command, the network-managed device-side Get-response command processing unit 204 accesses the device state storage memory 203 and
The device status detailed information of the network managed device 200 is stored in the device status storage memory 203 based on the MIB information of the t command.
It is determined whether or not it is stored. As a result of this determination, if the detailed device status information is stored in the device status storage memory 203, the network managed device side Get-
The response command processing unit 204 reads the device status detailed information from the device status storage memory 203, and
Issued as a se command and sent to the communication protocol processing unit 205
Send to

This communication protocol processing unit 205
A response command is transmitted to the communication protocol processing unit 101 of the network management device 100 via the information line A.
The communication protocol processing unit 101 receives this Get-response command and transmits it to the network management device-side Get-response command processing unit 105. Network management device side
When the Get-response command processing unit 105 receives the Get-response command, which is the detailed device status information, it notifies the management application processing unit 107 of the detailed information on the change in the device status of the corresponding network managed device 200.
Accordingly, the management application processing unit 107 executes a predetermined process based on the detailed information on the change in the device state.

The above description of the operation is for the case where the communication status between the network managed device 200 and the network management device 100 is in a normal state. When the issuing unit 104 issues a Get command, the Get command issuing unit 104 issues a Get-r
A Get request notification is sent to the esponse command reception management unit 106. The Get-response command reception management unit 106
When the request notification is received, the timer is started, and the Get-response command reception management unit 106 is started within the set period of the timer.
The network management device side Get-response command processing unit 105 sends the network managed device 200 Get-response command processing unit 204
It monitors whether a Get-response command has been received or not.

During the monitoring (that is, within the set period of the timer), the communication between the network management device 100 and the network managed device 200 fails, and the Get-response
The se command reception management unit 106 obtains a Get-response from the network managed device side Get-response command processing unit 204.
If no se command has been received, the Get-response command reception management unit 106
Notifies the re-request to issue the et command. In response to the re-request, the Get command issuing unit 104 issues a Get command to acquire the device state detailed information of the corresponding network managed device 200 again, and sends the Get command issuing unit 104 via the communication protocol processing unit 101 and the information line A. Management device side Ge
Transmit to the t-response command processing unit 204.

As a result, the network management device side Get-response command processing unit 105 switches from the network managed device side Get-response command processing unit 204 to the communication protocol processing unit 205, Get-resp through the communication protocol processing unit 101
By receiving the onse command, it is possible to acquire the detailed device state information of the corresponding network managed device 200. Therefore, even if there is a communication trouble between the network managed device 200 and the network management device 100, the detailed device state information of the network managed device 200 can be managed more reliably.

In the above embodiment, the network managed device 200 as the SNMP agent has been described as an SNMP agent having no managed device other than itself, but the present invention is not limited to this. Instead, the present invention can also be applied to a sub-network managed device that manages itself and managed devices under its control.

[0032]

As described above, according to the network management apparatus of the present invention, when a state change occurs in the network managed apparatus, the MIB that simplifies the Trap command is provided.
The information is transmitted from the network managed device to the network management device as a Trap command, and when the network management device determines that detailed information on a change in the device state of the network managed device is necessary, the network management device issues a Get command from the network management device. Send to the management device,
Get-response from the network managed device within a predetermined period
When the command is not received, the Get command is transmitted again from the network device to the corresponding network managed device. Therefore, the status conversion information of the network managed device is transmitted between the network management device and the network managed device. Can be managed more reliably.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a network management device of the present invention.

[Explanation of symbols]

A: Information line, 100: Network management device, 10
1,205: Communication protocol processing unit, 102: Trap
Command receiving unit, 103 ... Trap command analyzing unit, 10
4 Get command issuing unit, 105 Get-response processing unit on network management device side, 106 Get-response
Command reception management unit, 200 Network managed device, 201 Device status monitoring unit, 202 Trap command issuing unit, 203 Device status storage memory, 204
Get-response command processing unit on the network managed device side.

Claims (8)

[Claims] 1. A device status change provided in a network managed device having an SNMP protocol agent function and arranged as a network management device having an SNMP server function for performing network management when a status change of the network managed device occurs. A device status monitoring unit that outputs an occurrence notification and stores the device status detailed information at the time of occurrence of the device status change in a device status storage memory provided in the network managed device; and Trap for inputting the device status change occurrence notification output from the device status monitoring unit and outputting MIB information obtained by simplifying the detailed device status information to the network management device as a Trap command
A command issuing unit, provided in the network management device, wherein when the network management device receives the Trap command,
A Trap command analysis unit that analyzes MIB information of a command to determine whether or not a request for detailed device state information is required from the network managed device; and a Trap command analysis unit provided in the network management device. When it is determined that a request for detailed device state information is required, a Get command issuing unit that receives an issuance request from the Trap command analysis unit and outputs a Get command to a corresponding network managed device based on the MIB information; A network managed device that is provided in the managed device and reads device status detailed information of the corresponding network managed device from the device status storage memory from the MIB information of the Get command and outputs a Get-response command to the network management device A Get-response command processing unit, provided in the network management device, Get request information is notified from the Get command issuing unit, and a Get-response command for notifying the Get command issuing unit of a re-request for a Get command when no Get-response command is received from the network managed device within a predetermined time. A network management device, comprising: a reception management unit. 2. When the Trap command analysis unit determines that there is no need for a request for detailed device state information from the network managed device, the Trap command analysis unit sends the request to a management application processing unit provided in the network management device. 2. The network management device according to claim 1, wherein the network management device notifies a Trap command. 3. The Get-response command reception management unit notifies the Get command issuing unit of a re-request for the Get command when the Get-response command is not received within a period set by a timer. The network management device according to claim 1, wherein: 4. The Get-response command reception management unit is configured to execute Get-resp due to communication failure between the network management device and the network managed device within a predetermined time.
2. The network management device according to claim 1, wherein, when an onse command is not received, a re-request for the Get command is notified to the Get command issuing unit. 5. The network management device receives the Get-response command output from the network-managed device-side Get-response command processing unit, and sends a corresponding network-managed device to a management application processing unit of the network management device. The network management device according to claim 1, further comprising a network management device side Get-response command processing unit that notifies the device status detailed information of the device. 6. The network management device side Get-respon.
The se command processing unit notifies the Get command issuing unit of a re-request for the Get command from the Get-response command reception management unit, thereby returning the Get command issuance from the Get command issuing unit. 6. The network management device according to claim 5, wherein the detailed device status information of the network managed device is acquired. 7. The network management device according to claim 1, wherein the network management device is an SNMP agent having no managed device other than itself. 8. The network management apparatus according to claim 1, wherein the network management apparatus is a sub-network management apparatus that manages itself and managed apparatuses under its control. .