JPH0779221A - Automatic network management system - Google Patents

Abstract

PURPOSE:To automatically update a network constitution diagram when the constitution of a network having network equipment is changed. CONSTITUTION:This system is composed of the network equipment 3a and 3b provided with the correspondence chart of the addresses and physical ports of the network equipment present in the network and a network management device 2 connected to a display device 1 for displaying the network constitution diagram of the network equipment. The correspondence chart is obtained by a correspondence chart obtaining means 205 from the network equipment 3a by triggers generated from a correspondence chart obtaining timer 206 at every constant interval of time, analyzed in a position analysis means 207 and written in a storage part as position data by a storage part write means 208, the position data are read from the storage part by the triggers from a display processing timer 203 generated at every constant interval of time and the network constitution diagram is automatically updated and displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network including a network device having a correspondence table of addresses of network devices existing on the network and their physical input / output ports (hereinafter referred to as address vs. physical port). The present invention relates to a network automatic management system having a network management device that centrally manages the above network equipment.

[0002]

2. Description of the Related Art In recent years, a plurality of communication devices such as a plurality of bridges, routers, relay devices such as routers, hubs (HUs)
By connecting using a concentrator such as B), the development is being promoted in the direction of increasing the scale and complexity of the network. For example, for such networks, 1992
The Information Processing Society of Japan, 45th National Convention Proposal 2V-1 was developed to develop a network management device that centrally manages all network devices existing on the network. ing.

A conventional network management device will be described below with reference to FIG. FIG. 5 is a block diagram showing the configuration of a conventional network management device. In FIG. 5, reference numeral 200 denotes a network management device, for example,
An input device 5 such as a keyboard and the display device 1 such as a CRT are connected.

The network management device 200 is connected to the input device 5 and a storage device 202 for storing position data indicating the arrangement on the network configuration diagram showing the configuration of network devices existing on the network, and the network devices input from the storage device 202. From the position data conversion unit 212, the input processing unit 211 for inputting the position information of the position information, the position data conversion unit 212 for analyzing the position information input by the input processing unit 211, and converting the position information into the position data on the network configuration diagram. The output position data is stored in the storage unit 202.
The storage unit writing unit 208 for writing to the storage unit, the display processing unit 201 for reading the position data stored in the storage unit 202 again to the display device 1 and displaying the read position data, and the display processing unit 2.
01, and a display processing timer 203 for triggering the position data to be read out and output to the display device 1 by triggering at every predetermined time.

Next, the operation of the conventional network management apparatus 200 configured as described above will be described with reference to FIG. The network management device 200 reads the position data from the storage unit 202 and displays it on the display device 1 in a normal state in which there is no change in the configuration of the network to be managed (addition / removal of network device, position change, etc.). The state is maintained, and the displayed contents are unchanged.

Next, the operation when the network device is changed will be described. For example, when a network device is newly added to the network managed by the network management device 200, the operator checks the position of the added network device and inputs the position information of the added network device using the input device 5. In the network management device 200, the position information input from the input device 5 is received and processed by the input processing means 211. The input processing unit 211 converts the received position information into position data conversion unit 21.
Output to 2. The position data conversion unit 212 converts the position information input from the input processing unit 211 into position data on the network configuration diagram, and the result is the storage unit writing unit 20.
8 is used to write to the storage unit 202.

The display processing timer 203 issues a trigger to the display processing means 201 at predetermined fixed time intervals. Upon receiving a trigger from the display processing timer 203, the display processing unit 201 reads out the position data stored in the storage unit 202 and sends it to the display device 1, and the network including the display of the network device added by the addition of the position data. The block diagram is displayed on the display device 1.

[0008]

However, in the network management device having the conventional structure as described above, the position information of the network device changed by the operator must be manually input every time the network structure is changed. I had to do it. Therefore, the operator has to rely on the operator to change the position information of the network device in the network management device due to the change of the network configuration, which not only imposes a heavy burden on the operator but also takes a long time to change the position information.

The present invention has been made in view of the above-mentioned problems, and is automatically obtained from a network device having a correspondence table of addresses of network devices existing on a plurality of networks and physical ports without human intervention. An object of the present invention is to provide an automatic network management system that automatically updates and displays a network configuration diagram by automatically acquiring the position information of network devices based on a correspondence table.

Further, according to the present invention, when the network configuration is changed, the position information of the network device is obtained from the address-to-physical port correspondence table that is automatically obtained from the network device without human intervention. It is an object to provide a network management device that automatically updates and displays a figure.

Further, according to the present invention, the positional information of the network device is acquired from the address-to-physical port correspondence table that is automatically acquired from the network device without any manual operation, and only when the network configuration is changed. , The network configuration diagram is automatically updated to improve the efficiency of display by the network management device.

[0012]

In order to solve the above-mentioned problems, an automatic network management system according to the present invention has a correspondence table of addresses to physical ports of network devices connected to a network having at least one network device. And a network management device connected to the network device having the correspondence table, automatically acquiring the correspondence table, and extracting and displaying the position information of the network device from the network management device. It is characterized in that the network configuration diagram automatically updated based on the position information is displayed on the display device.

In order to solve the above problems, a network management device according to the present invention is a network management device connected to a network device having an address-to-physical port correspondence table of the network device connected to the network, A communication processing unit that receives a correspondence table from a network device that has a correspondence table, a correspondence table acquisition unit that acquires the correspondence table from the communication processing unit, and a trigger is generated for the correspondence table acquisition unit at an arbitrary fixed time interval. Correspondence table acquisition timer for acquiring the table, position analysis means for analyzing and outputting the position data of the network device from the correspondence table acquired by the correspondence table acquisition means, and network configuration diagram for displaying the position data of the network configuration And a storage unit writing unit that writes the position data from the position analysis unit to the storage unit. Display processing means for reading the position data stored in the storage unit and displaying a network configuration diagram based on the position data on a display device, and display processing for causing the display processing means to generate a trigger at an arbitrary fixed time and update the display. A network configuration diagram including a timer and automatically updated based on position data automatically obtained from the network device is displayed.

In order to solve the above-mentioned problems, the network management device according to the present invention compares the position data from the position analysis means with the position data from the storage part in place of the storage part writing means, and only when they differ. The position data from the position analysis unit is written in the storage unit, and a storage unit comparison writing unit that outputs a display signal that activates the display is used. Instead of the display processing timer, the display processing unit is activated in response to the display signal. The display processing starting unit for displaying the network configuration diagram updated based on the position data is characterized in that the display of the network configuration diagram is updated only when the network configuration is changed.

[0015]

The present invention is configured as described above, and in particular, a network device having a correspondence table of addresses and physical ports of network devices existing on a plurality of networks is connected, and the correspondence table is automatically acquired. By calculating the location data of the network device and automatically updating and displaying the network configuration diagram, even if there is a complicated change in the network device that exists on many networks, it requires human labor. Instead, it is possible to automatically and easily and quickly update and display the network configuration diagram.

The present invention is configured as described above, and in particular, automatically obtains the correspondence table from a network device having a correspondence table of address-to-physical port, finds and stores the position data of the network device, and By automatically updating and displaying the network configuration diagram based on the position data, the network configuration diagram is automatically updated without relying on human labor, thus reducing the burden on the operator.
It is possible to flexibly deal with a network configuration change.

The present invention is configured as described above, and in particular, the correspondence table is automatically obtained from a network device having a correspondence table of address-to-physical port to obtain the position data of the network device, and the position data is stored in the position data. Only when there is a change, it is stored internally, and the network configuration diagram is automatically updated and displayed based on the location data, so the network configuration diagram is automatically updated without relying on human labor, so the operator It is possible to reduce the load on the network and efficiently process the network configuration change.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described in detail below with reference to the accompanying drawings FIGS. First, the concept of the present invention will be described with reference to FIG. 3 in accordance with a network using the network automatic management system according to the embodiment of the present invention. FIG. 3 is a network configuration diagram showing a state before a network device is added to the network by using the network automatic management system according to the exemplary embodiment of the present invention.

In FIG. 3, reference numeral 1 is a display device such as a CRT for displaying the configuration of network equipment existing on the network, and 2 is an embodiment of the present invention having position data constituting the network configuration diagram displayed on the display device. The network management device 3a has a correspondence table of addresses of network devices existing on the network and physical ports, and supplies the network management device 2 with the correspondence table 4, 6 and 7 are network devices having no correspondence table. Is. At present, the network devices 6 and 7 are on the network connected to the network management device 2 using the network device 3a, but the network device 4 is outside the network.

Each network device on the network shown in FIG. 3 is connected to the network automatic management system (display device 1, network management device 2, and network having the correspondence table) according to the embodiment of the present invention through the network device 3a having the correspondence table. Although it is connected to the device 3a), in a normal operation state, operations such as information exchange (including the network device 3a having the correspondence table) are performed between the network devices.

Next, the operation when adding a new network device to such a network will be described. In FIG. 3, the network device 4 exists outside the network, but considers a case where it is automatically or manually connected to the network. now,
When the network device 4 is added to the network automatically or manually, the position information of the network device 4 is manually or automatically written in the address-to-physical port correspondence table of the network device 3a. This correspondence table will be used later by the network management device 2, which will be described later with reference to FIGS. 1 and 2. Also, when a network device is removed from the network or its location is changed, the correspondence table is updated in the same manner.

A network automatic management system and a network management apparatus according to the first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a block diagram showing the configuration of a network automatic management system having a network management device according to a first embodiment of the present invention.

In FIG. 1, 1 is a display device for displaying a network configuration diagram showing the position of each network device existing on the network, and 2 is the position of each network device existing on the network according to the first embodiment of the present invention. Network management device for centrally managing traffic, 3a and 3b
Is a network device that has an address-to-physical port correspondence table of each network device and supplies it to the network management device 2, 201 is a display processing means for displaying a network configuration diagram on the display device 1, and 203 is an arbitrary fixed value. A display processing timer that issues a trigger to the display processing unit 201 every time, and 204 is a network device 3 having a correspondence table.
a) a communication processing unit that performs a communication process for acquiring the correspondence table from a and 3b; 205, a correspondence table acquisition unit that acquires the correspondence table from the network devices 3a and 3b having the correspondence table via the communication processing unit 204; Correspondence table acquisition timer 207 that triggers the correspondence table acquisition means 205 every time
Is a position analysis means for analyzing and outputting the position data from the correspondence table, 202 is a storage unit for storing the position data of each network device with respect to the network configuration diagram, and 208 is a memory for writing the analyzed and output position data in the storage unit 202. This is a partial writing means.

Next, based on FIGS. 1 and 3, the first of the network automatic management systems configured as described above will be described.
An example of the operation will be described. As described above, FIGS. 1 and 3 show the network management device according to the first embodiment of the present invention (in FIG. 3, the network management device 2 of the first embodiment is shown. FIG. 2 is a diagram showing the configuration of a network automatic management system having the same or other embodiment). In this operation example, FIG.
The operation when the network device 4 is newly connected to the network connected using the network device 3a as shown in FIG. Of course, according to the present embodiment, even if there is no change in the configuration of the network device, the system operates in the same manner (only the display does not change as a result of the operation), and the description thereof will be omitted.

Before adding the network device 4, the network configuration diagram shows the network devices 6 and 7 on the network to which the network management apparatus is connected via the network device 3a. When this network device 4 is connected to the network, the network device 3
In addition to the information of the network devices 6 and 7, the position information of the network device 4 is manually or automatically registered in the address-to-physical port correspondence table included in a.

The correspondence table acquisition timer 206 of the network management device 2 issues a trigger to the correspondence table acquisition means 205 at an arbitrary fixed time interval. When the correspondence table acquisition unit 205 receives a trigger from the correspondence table acquisition timer 206, the correspondence table acquisition unit 205 acquires the address-to-physical port correspondence table of the network device 3a via the communication processing unit 204, and acquires the acquired network devices 4, 6 ,. The correspondence table having the position information of No. 7 is passed to the position analysis unit 207. The position analysis means 207 obtains the position information of the network devices 4, 6, 7 existing on the network connected to the network device 3a from the passed correspondence table, and the obtained position information of the network devices 4, 6, 7 To analyze and acquire the position data in the network configuration diagram and send it to the storage unit writing means 208. The storage unit writing unit 208 stores the received position data of the network devices 4, 6, and 7 in the storage unit 202.

Further, the display processing timer 203 issues a trigger to the display processing means 201 at every predetermined fixed time. The display processing means 201 is a display processing timer 2
Upon receiving a trigger from 03, the position data stored in the storage unit 202 is read out and sent to the display device 1 to display the network configuration diagram based on the position data.
Since the position data currently stored in the storage unit 202 indicates that the network devices 4, 6 and 7 are present on the network connected via the network device 3a, they are displayed on the display device 1. In the network configuration diagram, the network devices 4, 6 and 7 are displayed on the network connected via the network device 3a.

As described above, according to the first embodiment of the present invention, the address-to-physical port correspondence table is automatically acquired, and the position information of the network device existing on the network is calculated and calculated. A new network device is added to the network by obtaining and storing the position data on the network configuration diagram from the location information of the network device, reading the stored position data, and displaying the network configuration diagram updated based on the position data. When connected, the network configuration diagram can be automatically updated with the information of the newly connected network device and displayed.

Next, a second operation example of the network automatic management system according to the first embodiment of the present invention connected to the network shown in FIG. 4 will be described with reference to FIGS. 1 and 4. FIG. 4 shows network devices 3a and 3b in which the network automatic management system according to the first embodiment of the present invention is connected to two networks respectively.
It is a figure which shows the structure connected to each network apparatus via. First, the configuration will be described with reference to FIG.

In FIG. 4, reference numeral 1 is a display device such as a CRT for displaying the configuration of network devices existing on two networks, and 2 is the first embodiment of the present invention having position data constituting the network configuration diagram displayed on the display device. The network management device 3a according to the first embodiment has a correspondence table of addresses to physical ports of network devices existing on one network (circular in this example) and supplies the network management device 2 with the correspondence table, The network devices 4, 6 and 7 which have a correspondence table of the addresses of the network devices existing on the other network (radial in this example) and the physical ports and which supply the same to the network management device 2 are connected via the network device 3a. Network equipment existing on the connected ring network,
Reference numerals 8 and 9 denote network devices existing on the radial network connected via the network device 3b.

The network management device 2 is connected to the display device 1 and the network device 3a (similar to FIG. 1) in the same manner as the network configuration shown in FIG. In FIG. 4, in addition to the components shown in FIG.
Similarly to the network device 3a, the network device 3b radially connected to is connected to the network management device 2 as shown in FIG.

In the second operation example in which the network automatic management system according to the first embodiment of the present invention is connected, a ring network connecting a network device 4 existing on the network shown in FIG. 4 via a network device 3a to a network The processing operation when moving to the radial network connected via the device 3b will be described.

First, the network device 4, on the ring network connected through the network device 3a,
When there are 6 and 7, the network configuration diagram is constructed and displayed according to the same procedure as the first operation example described above. Next, in the case where the network devices 8 and 9 are present on the radial network connected via the network device 3b, the position information obtained from the address-to-physical port correspondence table is obtained by following the same procedure as above. Included in the network configuration diagram. That is, in the network configuration diagram thus displayed, the network devices 4, 6, 7 are present on the ring network connected via the network device 3a, and are connected via the network device 3b. The network devices 8 and 9 are present on the radial network.

A case will be described below in which the network device 4 is moved from a ring network connected via the network device 3a to a radial network connected via the network device 3b in the above configuration. When the network device 4 is moved in this way, the information on the network device 4 registered in the address-to-physical port correspondence table of the network device 3a is deleted from the correspondence table, and the network device 3 is deleted.
It is registered in the address-to-physical port correspondence table of b.

The deletion and the joining of the position information with respect to such a correspondence table may be performed simultaneously with or separately from the network device deleting and joining process, or automatically or manually. When the address-to-physical port correspondence table is registered in this way, the description will proceed to FIG.

In FIG. 1, thereafter, the correspondence table acquisition timer 206 issues a trigger to the correspondence table acquisition means 205 when an arbitrary fixed time elapses. Correspondence table acquisition means 205
Receives a trigger from the correspondence table acquisition timer 206, the network devices 3a and 3b are transmitted via the communication processing unit 204.
The address-to-physical port correspondence table owned by is acquired, and the acquired correspondence table is sent to the position analysis means 207. The position analysis means 207 determines from the received correspondence table the network devices 3a and 3
The presence of the network device connected to b is obtained, the position data on the network configuration diagram for the obtained network device is analyzed, and passed to the storage unit writing means 208. The storage unit writing means 208 stores the passed position data in the storage unit 2.
Stored in 02.

In this case, the correspondence table of the network device 3a has the information of the network devices 6, 7 registered therein, and the correspondence table of the network device 3b has the information of the network devices 4, 8, 9 registered therein. , The position data of the network devices 6 and 7 are present on the ring network connected via the network device 3a, and the position data of the network devices 4, 8 and 9 are connected via the network device 3b to the radial network. It is stored in the storage unit 202 as being present above.

Further, the display processing timer 203 issues a trigger to the display processing means 201 when an arbitrary fixed time is reached. The display processing means 201 includes a display processing timer 20.
3 receives the trigger, the position data stored in the storage unit 202 is read and the network configuration diagram is displayed on the display device 1. That is, in this example, the position data of the network devices 6 and 7 exists on the ring network connected to the network device 3a, and the position data of the network devices 4, 8 and 9 is the network device 3.
Since it is stored in the storage unit 202 as existing on the radial network connected to b, the network devices 6 and 7 are connected to the network device 3a on the ring network connected to the network device 3a. It can be seen that the network devices 4, 8 and 9 exist on the radial network connected to the network device 3b.

As described above, according to the second operation example, when a network device is moved between networks connected to the same network management device, the address-to-physical port correspondence table of the moved network device. Using the correspondence table that is automatically acquired from the network device that has a fixed time interval, the position data of the network device existing on the network is obtained and stored internally, and the stored data is saved at the fixed time interval. Since the updated network configuration diagram is displayed by being read out, the position of the moved network device in the network configuration diagram can be automatically updated and displayed.

Next, an automatic network management system having a network management device according to the second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a configuration diagram thereof. In this embodiment, the network management device 2'implemented there is configured as follows. That is, FIG.
In place of the display processing timer 203 used in the first embodiment shown in FIG. 2, a display processing starting unit 210 that starts the display processing unit 201 is used, and instead of the storage unit writing unit 208, the position analysis unit 207 analyzes. Only when the resulting position data is different from the position data read from the storage unit 202, the position data resulting from the analysis by the position analysis unit 207 is written in the storage unit 202, and the display processing is started by the display processing starting unit 210. The storage section comparison writing means 209 for sending is used. Since the other elements are the same as those in the first embodiment shown in FIG. 1, the description thereof will be omitted.

The operation of the network automatic management system having the network management device according to the second embodiment of the present invention will be described below with reference to FIG. However, since the parts other than the above-mentioned different parts have been sufficiently described in the first embodiment, only the parts relating to the operation peculiar to the second embodiment will be described.

The correspondence table acquisition timer 206 issues a trigger to the correspondence table acquisition means 205 at an arbitrary fixed time interval. Upon receiving a trigger from the correspondence table acquisition timer 206, the correspondence table acquisition unit 205 acquires the address-to-physical port correspondence table from the network devices 3a and 3b, and sends the acquired correspondence table to the position analysis unit 207. The position analysis unit 207 obtains a network device existing on the network to which the network devices 3a and 3b are connected from the received correspondence table, analyzes the position data in the network configuration diagram of the obtained network device, and stores the result in the storage unit comparison document. Included means 209
Pass to.

The storage comparing / writing means 209 reads the position data relating to the network device currently being processed from the storage 202, and the position data and the position analyzing means 2 are read.
Compared with the position data received from 07, only when they do not match, the position data received from the position analysis means 207 is written in the storage unit 202, and a display signal is sent to the display processing starting unit 210.

If the position data regarding the network device currently being processed exists in the memory 202, the memory comparing / writing means 209 stores the position data in the memory 20.
2 and sends it to the display processing means 201, and the display device 1
To display. When the position data passed from the position analysis unit 207 and the position data read out from the storage unit 202 are different, the position data passed from the position analysis unit 207 is written in the storage unit 202, and the display processing start unit 210 displays the display signal. To send. When the display processing starting unit 210 receives the display signal from the storage comparing and writing unit 209, the display processing unit 2
Start 01. The display processing unit 201 includes a storage unit 202.
The position data stored in is read, and the display device 1 is caused to display the network configuration diagram based on the read position data.

As described above, when the position data stored in the network management device is changed due to the change of the network configuration, the stored position data is read and the network configuration diagram is updated and displayed. Therefore, the configuration of the network is changed. Then, it can be immediately reflected in the network configuration diagram. In addition, if there is no change in the location data stored inside the network management device, the network configuration diagram is not updated. Therefore, avoid unnecessary network configuration diagram update and redisplay processing because the network configuration has not changed. You can

[0046]

The present invention is configured as described above, and automatically obtains from a network device having an address-to-physical port correspondence table of the network device existing on each of a plurality of networks without human intervention. Based on the correspondence table, the location information of network devices is automatically acquired, and the network configuration diagram is automatically updated and displayed. This makes complicated changes to network devices existing on many networks. Even if there is, it is possible to flexibly deal with the configuration change of the network device by automatically and easily and quickly updating and displaying the network configuration diagram without requiring any manpower.

Further, the present invention is configured as described above, and acquires the position information of the network device from the address-to-physical port correspondence table that is automatically acquired from the network device without manual operation, and the network configuration is obtained. When the network configuration diagram is automatically updated only when there is a change in the network configuration, it is possible to reflect the changes in the network configuration to the network configuration diagram quickly and at the same time when there is no change in the network configuration diagram. The unnecessary redisplay processing of the network configuration diagram can be avoided, and the display processing of the network configuration diagram can be efficiently performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a network automatic management system having a network management device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a network automatic management system having a network management device according to a second embodiment of the present invention.

FIG. 3 is a network configuration diagram showing a state before a network device is added to the network by using the network automatic management system according to the exemplary embodiment of the present invention.

FIG. 4 is a network configuration diagram showing a state in which a network device is moved between networks using the network automatic management system according to the embodiment of the present invention.

FIG. 5 is a configuration diagram of a network management system having a conventional network management device.

[Explanation of symbols]

 1 Display Device 2 Network Management Device 2'Network Management Device 3a Network Device 3b Network Device 4 Network Device 5 Input Device 6 Network Device 7 Network Device 8 Network Device 9 Network Device 200 Network Management Device 201 Display Processing Means 202 Storage Unit 203 Display Processing Timer 204 Communication processing unit 205 Correspondence table acquisition unit 206 Correspondence table acquisition timer 207 Position analysis unit 208 Storage unit writing unit 209 Storage unit comparison writing unit 210 Display processing starting unit 211 Input processing unit 212 Position data conversion unit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location H04L 29/14 (72) Inventor Yoshihiro Kawagoe 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Takafumi Tsujizawa 1006 Kadoma, Kadoma-shi, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A network device having an address-to-physical port correspondence table of the network device connected to a network having at least one network device, and a network device connected to the network device having the correspondence table. And a network management device that automatically acquires and displays the positional information of the network device from the acquired correspondence table, and displays a network configuration diagram automatically updated based on the position information from the correspondence table. An automatic network management system characterized by displaying on. 2. A network management device connected to a network device having an address-to-physical port correspondence table of the network device connected to the network,
A communication processing unit that receives a correspondence table from a network device that has the correspondence table, a correspondence table acquisition unit that acquires the correspondence table from the communication processing unit, and a trigger for the correspondence table acquisition unit at an arbitrary fixed time interval. A correspondence table acquisition timer that is generated and acquires the correspondence table, a position analysis unit that analyzes and outputs position data of the network device from the correspondence table acquired by the correspondence table acquisition unit, and the position data in the network configuration. And a storage unit for storing the position data from the position analysis unit in the storage unit, and the position data stored in the storage unit for reading the position data. Display processing means for displaying a network configuration diagram based on the position data on a display device, and a display is generated by triggering the display processing means at an arbitrary fixed time interval. And a display processing timer to new is,
A network management device for displaying a network configuration diagram that is automatically updated based on position data automatically obtained from a network device. 3. The storage unit writing unit compares the position data from the position analyzing unit with the position data from the storing unit, and stores the position data from the position analyzing unit in the storing unit only when they are different from each other. A network configuration diagram in which a storage section comparing and writing means for writing and outputting a display signal for activating the display is used, and the display processing timer activates the display processing means in response to the display signal and updates based on the position data. 3. The network management device according to claim 2, wherein the display processing starting unit for displaying is configured to update the display of the network configuration diagram only when the network configuration is changed.