JP3289651B2 - Network management method and system, management device used in the system, and program recording medium - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to network management of a communication network, and more particularly to a network management system using SNMP (Simple Network Management Protocol).

[0002]

2. Description of the Related Art An SNMP-compliant network management system includes a network device having an SNMP agent function (hereinafter, referred to as a sub-network management device) and a network device having an SNMP server function (this specification). In this document, this is referred to as a network management device).

A sub-network management device manages and controls various devices under its own device and various devices in its own device. A network management device collects information from each sub-network management device and manages each sub-network management device. The entire system is managed by giving an operation instruction or the like to the target.

[0004] In SNMP, a protocol of a message exchanged between a sub-network management device and a network management device is defined, and notification of state change information of a management target from the sub-network management device to the network management device, network management, and the like. All operation requests from the device to the sub-network management device are issued according to this protocol.

A conventional network management system based on SNMP is disclosed in, for example, Japanese Patent Laid-Open No. 7-18393.
As described in Japanese Patent Application Laid-Open Publication No. 2002-214, when a state change occurs in a device under the sub-network management device and a device in its own device, detailed state change information (which state change occurs in which device) is included in Trap-PDU. Information that describes in detail whether the error has occurred) is described and transmitted from the subnetwork management apparatus to the network management apparatus.

[0006]

By the way, the sub-network management device and the network management device are often connected by a LAN such as Ethernet. Such LA
It is empirically known that when a Trap-PDU or the like is transmitted and received as a packet via N, the longer the packet length is, the lower the probability of receiving correctly is. For this reason, in the method of transmitting a trap packet including detailed state change information, the trap packet length becomes longer,
The network management device may not be able to receive Trap packets. For the Trap packet, the lower protocol is U
Since it is DP / IP, communication confirmation is not performed between the network management device and the sub-network management device. For this reason,
Even when the network management device does not receive the Trap packet, the Trap packet is not retransmitted.
Therefore, there is a problem that the network management device cannot reliably manage the status change of the sub-network management device.

[0007] The present invention has been proposed in view of such circumstances, and an object of the present invention is to enable a network management device to reliably manage a change in state of a subnetwork management device.

[0008]

In order to achieve the above object, a network management method according to the present invention provides a network management device which is used when a status change occurs in a subnetwork management device.
Predefined between the device and the subnetwork management device.
An object indicating the status change notification MIB information
More state change information includes a name and flag simplified reporting only that a state change has occurred in that does not contain a single <br/> T
A wrap packet is transmitted from the sub-network management device to the network management device, and acquisition of detailed information on the state change is performed by issuing a Get command from the network management device to the sub-network management device. The reception of the Get-response command for the command is monitored, and when the Get-response command is not received within a predetermined time, the Get command is reissued.

[0009] For the network management system of the present invention to achieve the above object, the sub-network management apparatus, when a state change occurs in the managed network pipe
Predefined between the management device and the subnetwork management device.
Object indicating the status change notification MIB information
Detailed information of state change and a-object name and the flag including Mana
A simplified Trap packet reporting only simply state change had occurred comprises means for transmitting from the sub-network management unit to the network management device, the network management device, when receiving the Trap packet,
G for acquiring detailed information on the state change to the sub-network management apparatus that is the source of the Trap packet.
means for issuing a Get command, monitoring reception of a Get-response command for the Get command,
Means for re-issuing the Get command when the command is not received within a predetermined time.

As described above, in the present invention, since the detailed information of the state change is not included, the packet length of the Trap packet is shortened, and the probability that the Trap packet does not arrive at the network management device can be reduced accordingly. And a Get-response to the Get command
By monitoring the reception of the command and re-issuing the Get command if the command is not received within a predetermined time, the network management device can reliably acquire detailed information on the state change.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, a network management system according to an embodiment of the present invention includes a network management apparatus 100 having an SNMP server function and a subnetwork management apparatus 200 having an SNMP agent function. , Both are communication paths (for example, Ethernet) 3
00 are communicably connected to each other. In this example, only one sub-network management device 200 is provided, but generally there may be a plurality of sub-network management devices. Also, the sub-network management device 200
May have one or more SNMP agents under its control, and S has no managed device other than itself.
It may be an NMP agent.

The recording medium 400 is a machine-readable recording medium such as a CD-ROM, a magnetic disk, and a semiconductor memory. The program for the network management device recorded here is read by a computer constituting the network management device 100. , Controls the operation of the computer, and illustrates the communication protocol processing unit 101, the Trap command receiving unit 102, the Trap command analyzing unit 103, the Get command issuing unit 104, the Ge
t-response command processing unit 105, Get-
It functions as the response command reception management unit 106 and the management application processing unit 107.

Here, the communication protocol processing unit 101
This part is responsible for SNMP packet transmission / reception processing and TCP / IP packet processing. Trap command receiving unit 10
Reference numeral 2 denotes a portion that receives a Trap command from the sub-network management device 200 via the communication protocol processing unit 101, and a Trap command analysis unit 103 analyzes the received Trap command. The Get command issuance unit 104 obtains the G related to the acquisition of the detailed information of the state change in accordance with the instruction from the Trap command analysis unit 103.
a part for sending an “et” command to the sub-network management apparatus 200 via the communication protocol processing unit 101;
The -response command processing unit 105 is a unit that receives, via the communication protocol processing unit 101, a Get-response command, which is a response from the sub-network management device 200 to the sent Get command, and performs processing. The Get-response command reception management unit 106 monitors the reception of the Get-response command corresponding to the transmitted Get command, and within a predetermined time from the transmission of the Get command, the Get-response command.
This part instructs the Get command issuing unit 104 to reissue the Get command when the response command is not received. The management application processing unit 107 is a unit that performs processing related to the overall monitoring control of the SNMP agent.

The recording medium 500 is a machine-readable recording medium such as a CD-ROM, a magnetic disk, and a semiconductor memory. The program for the sub-network management device recorded here is stored in a computer constituting the sub-network management device 200. It is read and controls the operation of the computer, and the communication protocol processing unit 201, Trap command issuing unit 202, Get
-Function as the response command processing unit 204 and the device state monitoring unit 205. Reference numeral 203 denotes a device state storage memory.

Here, the communication protocol processing unit 201
This part is responsible for SNMP packet transmission / reception processing and TCP / IP packet processing. Device status storage memory 203
Is a memory that holds the latest information on the device status for each management target. The device status monitoring unit 205 is a unit that monitors a change in the status of the device to be managed under the own sub-network management device 200 and a device of the own sub-network management device 200 itself. Update the relevant device status. When a status change is detected by the device status monitoring unit 205, the Trap command issuing unit 202 notifies the simplified T that only notifies that a status change has occurred without including detailed information of the status change.
The rap command is converted to a trap packet as a Trap packet via the communication protocol processing unit 201.
This is the part to be sent to 0. When a Get-response command processing unit 204 receives a Get command for acquiring state change detailed information from the network management device 100 via the communication protocol processing unit 201, the Get-response command processing unit 204 reads the detailed information from the device state storage memory 203,
This is a part that creates a t-response and sends it to the network management device 100 via the communication protocol processing unit 201.

FIG. 2 shows an example of the configuration of state change notification MIB information defined between the network management apparatus 100 and the subnetwork management apparatus 200 in advance. It is composed of an object name indicating the status change notification MIB information and a flag, and setting the value of the flag to, for example, 1 indicates that some state change has occurred. Note that an arbitrary name (ID) can be used as the object name within a range that does not overlap with the object name that specifies the management target.

FIGS. 3 and 4 are flowcharts showing an example of the processing of the subnetwork management apparatus 200, and FIGS. 5 and 6 are flowcharts showing an example of the processing of the network management apparatus 100. Hereinafter, the operation of this embodiment will be described with reference to the drawings.

When a status change occurs in a device under the control of the sub-network management device 200 or a device of the device 200 itself (S1 in FIG. 3), the device status monitoring unit 205 describes the status change notification MIB information shown in FIG. Trap to send the trap command to the network management device 100.
It notifies the p-command issuing unit 202 and, at the same time, stores the device status information at that time in the device status storage memory 203 (S2). The Trap command issuing unit 202 issues a Trap command to the communication protocol processing unit 201 in accordance with the notification from the device state monitoring unit 205 (S3). The communication protocol processing unit 201 packetizes the Trap command and sends the packet via the communication path 300. Network management device 10
0 (S4). As a result, even when a state change occurs in one or a plurality of devices, the device state detailed information indicating how the state of each device has changed is not notified, and the state change is simply performed to any device. Is notified from the subnetwork management apparatus 200 to the network management apparatus 100 only.

The transmitted Trap packet is received by the communication protocol processing unit 101 of the network management device 100 (S21 in FIG. 5). Communication protocol processing unit 10
1 indicates that a Trap command related to a received packet is Tr
A notification is sent to the ap command receiving unit 102 (S22). Tr
The ap command reception unit 102 notifies the Trap command to the Trap command analysis unit 103 (S23).
The Trap command analysis unit 103 analyzes the Trap command (S24), and if the MIB information in the Trap command is the status change notification MIB information (YES in S25), it is necessary to get the detailed information. It notifies the Get command issuing unit 104 of MIB information such as the names of all managed objects managed by the original subnetwork management apparatus 200, and instructs the Get command issuing unit 104 to issue a Get command (S26). On the other hand, if the MIB information is
If it is not the B information, the Trap command analysis unit 103 notifies the management application processing unit 107 of the Trap command as in the conventional case (S27).

The Get command issuing unit 104
Based on the MIB information received from the command analysis unit 103, a Get command for acquiring status information of all management targets of the corresponding subnetwork management apparatus 200 is issued (S28). The communication protocol processing unit 101 transmits it to the corresponding sub-network management device 200 via the communication path 300 (S29).

At the same time, the Get command issuing unit 104
Get-respons issuance of the et command.
e-command reception management unit 106 is notified and Get-res
The response command reception management unit 106 activates an internal timer, and within a predetermined time until the timer times out, the Get-response command processing unit 105
Get-res related to the above sent Get command
The monitoring of whether to receive the pose command is started (S30). Then, within a predetermined time, Get-respo
When the nse command is received, the operation is terminated, but the Ge failure occurs within a predetermined time due to communication failure between the network management apparatus 100 and the sub-network management apparatus 200.
If the t-response command has not been received (NO in S31), the Get-response command reception management unit 106 notifies the Get command issuing unit 104 to issue the previously issued Get command again. (S32). Then, the internal timer is started again, and the Get-response associated with the sent Get command by the Get-response command processing unit 105 within a predetermined time until the timer expires.
The monitoring of whether to receive the once command is started (S30).

On the other hand, in the subnetwork management device 200, the Get command transmitted from the network management device 100 is received by the communication protocol processing unit 201 (S11 in FIG. 4). Communication protocol processing unit 201
Converts the received Get command to Get-respons
The e-command processing unit 204 is notified (S12). Get
The -response command processing unit 204 reads the device status information of all management targets from the device status storage memory 203, and issues a Get-response command including this information to the communication protocol processing unit 201 (S1).
3). The communication protocol processing unit 201 uses the Get-r
The response command is transmitted to the network management device 100 via the communication path 300 (S14).

The transmitted Get-response
The command is received by the communication protocol processing unit 101 of the network management device 100 (S41 in FIG. 6). The communication protocol processing unit 101 receives the Get-resp
An onse command is notified to the Get-response command processing unit 105 (S42). Get-resp
once command processing unit 105 is a Get-respo
The device status information of all the management targets of the subnetwork management device 200 notified by the nse command is notified to the management application processing unit 107 (S43). At the same time, Ge
G that the t-response command has been received
Notify the et-response command reception management unit 106 (S44).

[0025]

As described above, according to the present invention,
When a status change occurs in the subnetwork management device, a simplified Trap packet notifying the fact that the status change has occurred without including detailed information of the status change is transmitted from the subnetwork management device to the network management device. Therefore, the Trap packet length is shortened, and the probability that the Trap packet does not arrive at the network management device can be reduced. The detailed information on the state change is obtained by issuing a Get command from the network management device to the sub-network management device, and the network management device monitors reception of a Get-response command for the Get command, and Since the Get command is reissued when it is not received within the time, the network management device can reliably manage the state change of the subnetwork management device.

[Brief description of the drawings]

FIG. 1 is a block diagram of a network management system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration example of state change notification MIB information predefined between a network management device and a sub-network management device.

FIG. 3 is a flowchart illustrating a processing example when a state change occurs in a subnetwork management apparatus.

FIG. 4 is a flowchart illustrating a processing example when a Get command is received by the subnetwork management device.

FIG. 5 is a flowchart illustrating an example of a process when the network management device receives a Trap packet.

FIG. 6 is a diagram illustrating a Get-response of the network management apparatus.
It is a flowchart which shows the example of a process at the time of se command reception.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 100 ... Network management apparatus 101 ... Communication protocol processing part 102 ... Trap command receiving part 103 ... Trap command analysis part 104 ... Get command issuing part 105 ... Get-response command processing part 106 ... Get-response command reception management part 107 ... Management application Processing unit 200 ... Subnetwork management device 201 ... Communication protocol processing unit 202 ... Trap command issuing unit 203 ... Device status storage memory 204 ... Get-response command processing unit 205 ... Device status monitoring unit 300 ... Communication path 400, 500 ... Recording medium

Continuation of the front page (56) References JP-A-8-331206 (JP, A) JP-A-9-101929 (JP, A) JP-A-8-328970 (JP, A) JP-A-8-263407 (JP) , A) Hisao Ohgane, ~ SNMP and CMIP ~ TCP / IP and OSI Network Management, Japan, Soft Research Center, Inc., April 15, 1993, Section 4.4, p. 173-193 (58) Field surveyed (Int. Cl. ⁷ , DB name) G06F 13/00 H04L 12/00

Claims (5)

(57) [Claims] In a network management system including a sub-network management apparatus having an agent function of SNMP which is a management protocol of network equipment, and a network management apparatus having a server function of SNMP, an object to be managed by the sub-network management apparatus is provided. When the status changes, the network management device and the subnetwork
MIB information for status change notification predefined between the
From subnetwork management apparatus Trap packet details include shaped <br/> status change the object name and flag simplified reporting only simply state change that does not contain occurs indicating that the broadcast The information is transmitted to the network management device, and the detailed information on the state change is obtained by issuing a Get command from the network management device to the sub-network management device, and the network management device obtains a Get-respo for the Get command.
A network management method characterized by monitoring reception of an nse command and re-issuing a Get command if the command is not received within a predetermined time. 2. A network management system, comprising: a sub-network management device having an SNMP agent function as a management protocol of network equipment; and a network management device having an SNMP server function. When the status of the target changes, the network management device
The predefined state between the
Object indicating that this is MIB information for status change notification
Tr details state change includes a name and flag of a simplified reporting only simply state change that does not contain occurs
means for transmitting an ap packet from the sub-network management device to the network management device, wherein the network management device, upon receiving the Trap packet,
Means for issuing a Get command for acquiring detailed information on the state change; monitoring reception of a Get-response command for the Get command;
means for reissuing an et command. 3. A network management device having an SNMP server function, wherein the network management device and the subnetwork management device are provided when a status of a management target is changed by the subnetwork management device.
The status change notification MIB information defined in advance between the
The Trap packet more state change information includes an object name and a flag with a simplified reporting only simply state change that does not contain occurred indicating that when received from the sub-network management system, the For the sub-network management device that is the source of the Trap packet,
Means for issuing a Get command for acquiring detailed information on the state change; monitoring reception of a Get-response command for the Get command;
means for reissuing an et command. 4. A sub-network management apparatus having an agent function of SNMP which is a management protocol of network equipment, wherein when a state of a management target changes, the equipment state information at that time is stored in an equipment state storage memory. And network
Between the network management device and the subnetwork management device.
O indicating that the status change notification MIB information is defined.
More information state change includes a object names and flags including
Means for transmitting a Trap packet simply state change Manai is simplified reporting only that occurring in the network management device, when receiving the Get command to retrieve detailed information state change from the network management device The device status information stored in the device status storage memory is acquired by Get-r
means for notifying the network management device by an response command. 5. A computer constituting a sub-network management apparatus having an agent function of SNMP which is a management protocol of network equipment, is configured to be connected to a network management apparatus and a subnet network when a state change occurs in a management target.
M for status change notification predefined with the network management device
And an object name and a flag indicating that the IB information
More about state changes include the to function as a means for transmitting a Trap packet simplified reporting only simply state change that does not contain occurs in the network management device,
When the computer constituting the network management apparatus having the SNMP server function receives the Trap packet, the computer sends the computer to the sub-network management apparatus that is the source of the Trap packet to acquire detailed information on the state change. A program recording medium which records a program for issuing a Get command, monitoring reception of a Get-response command corresponding to the Get command, and functioning as a means for reissuing the Get command when the Get command is not received within a predetermined period.