JP2022087693A - Network configuration identification device and method - Google Patents

Abstract

To identify a network configuration even in a case where a network apparatus which is unadaptable to acquisition of MAC address table information.SOLUTION: On the basis of port-address correspondence information included in MAC address table information 14B and MAC address information 14A, a trunk configuration identification unit 15C identifies a trunk configuration indicating a connection form relating to a trunk apparatus which could acquire the MAC address table information 14B, among network apparatuses. On the basis of the port-address correspondence information included in the MAC address table information 14B, the MAC address information 14A and the trunk configuration, a terminal apparatus identification unit 15D identifies a terminal apparatus which is directly connected to the trunk apparatus, and a terminal apparatus which is indirectly connected to the trunk apparatus via a non-trunk apparatus other than the trunk apparatus, among the network apparatuses.SELECTED DRAWING: Figure 1

Description

The present invention relates to a network configuration specifying technique for specifying a connection form of various connected devices such as communication control devices and terminal devices connected to an IP network as a network configuration.

With the spread of IoT (Internet of Things) in recent years, conventional L2 (layer 2) switches (switching hubs), hubs, routers, gateways, and other network devices (communication control devices) that control packet transfer, and information such as PCs. In addition to processing terminals, various terminal devices such as sensors, field devices, and controllers used in IoT are now connected to IP networks such as LANs. If the network configuration of the IP network becomes complicated due to the increase in the number of connected devices, the entire network configuration cannot be easily grasped, and it becomes difficult to quickly identify the cause when a trouble occurs.

Specifically, if the worker does not understand the entire network configuration, identify which network device and which port the terminal device to be checked for trouble occurrence status and maintenance is connected to. Is difficult. Therefore, in such a case, the worker goes to the site to visually check the connection form (connection status) of each connected device, and the target connected device is connected to which network device and which port. It is necessary to specify whether or not. Therefore, there is a problem that the work load required for troubleshooting and maintenance becomes large.

Conventionally, as a technique for visualizing such a network configuration, Patent Document 1 describes a MAC address table from a network device having a MAC address table such as an L2 switch by using, for example, ARP (Address Resolution Protocol) among network devices. A technique has been proposed in which information is acquired and the physical connection form, that is, the network configuration, for each connected terminal is specified from the obtained MAC address table information. As a result, the network configuration can be remotely specified from any information processing terminal connected to the IP network, and the cause can be quickly identified when a trouble occurs.

Japanese Unexamined Patent Publication No. 2016-032226

In the prior art of Patent Document 1 described above, it is a prerequisite that a MAC address table can be obtained. However, network devices connected to IP networks include not only L2 switches and L3 (layer 3) switches that have MAC address table information, but also hubs that do not originally interpret MAC addresses, that is, do not have MAC address table information. .. In addition, some network devices have MAC address table information but do not support acquisition of MAC address table information. Therefore, there is a problem that the network configuration cannot be specified when a network device that does not support the acquisition of MAC address table information is included.

The present invention is for solving such a problem, and provides a network configuration specifying technique capable of specifying a network configuration even when a network device that does not support acquisition of MAC address table information is included. It is an object.

In order to achieve such an object, the network configuration specifying device according to the present invention includes MAC address information indicating all MAC addresses of connected devices consisting of network devices and terminal devices connected to an IP network, and network devices. The storage circuit configured to store the MAC address table information acquired from, and the MAC address of the port of the network device and the connected device connected to the port included in the MAC address table information of the network device. The control circuit includes a port-address correspondence information indicating the correspondence relationship of the above and a control circuit configured to specify a network configuration indicating a connection form related to the connected device based on the MAC address information, and the control circuit is a port-address. Port-address correspondence with the trunk line configuration specifying unit configured to specify the trunk line configuration indicating the connection mode of the trunk line device for which the MAC address table information could be acquired among the network devices based on the correspondence information and the MAC address information. Based on the information, MAC address information, and trunk line configuration, the terminal device directly connected to the trunk line device and the network device are indirectly connected to the trunk line device via the non-trunk line device other than the trunk line device. It is equipped with a terminal device identification unit configured to identify the terminal device.

Further, in one configuration example of the network configuration specifying device according to the present invention, the presence or absence of a port in which the trunk line configuration specifying unit is associated with all the MAC addresses of trunk line devices other than the trunk line device for each trunk line device. If there is a port, identify that the trunk line device is a terminal trunk line device, and for each trunk line device other than the terminal trunk line device, there is a port to which only one terminal trunk line device is associated. If there is a port, identify the trunk line device as an intermediate trunk line device connected to the terminal trunk line device via a trunk line route, and specify the trunk line configuration based on these identification results. It is configured in.

Further, in one configuration example of the network configuration specifying device according to the present invention, the trunk line configuration specifying unit has a port to which a plurality of terminal trunk line devices are associated with each trunk line device other than the terminal trunk line device. Check and if there is the port, select the port to which the terminal trunk line device is associated among the trunk line devices other than the terminal trunk line device, and among the selected ports, the trunk line associated with the port. The trunk line device having the port with the smallest number of devices is configured to identify the intermediate trunk line device connected to the terminal trunk line device via the trunk line path.

Further, in one configuration example of the network configuration specifying device according to the present invention, the terminal device specifying unit has one terminal device in the port provided in the trunk line device to which no other trunk line device is connected. When it is connected, it is configured to specify that the terminal device is directly connected to the trunk line device.

Further, in one configuration example of the network configuration specifying device according to the present invention, the terminal device specifying unit has a plurality of terminal devices in the ports provided in the trunk line device to which other trunk line devices are not connected. When connected, these terminal devices are configured to identify that they are indirectly connected to the trunk line device via a non-trunk line device.

Further, in one configuration example of the network configuration specifying device according to the present invention, the terminal device specifying unit has two trunk line devices connected to each port facing each other in the trunk line configuration, and is the same as these ports. When the terminal devices of the above are commonly connected, it is configured to specify that the terminal devices are indirectly connected between the trunk line devices via the non-trunk line devices.

Further, in one configuration example of the network configuration specifying device according to the present invention, the terminal device specifying unit is connected to two trunk line devices facing each port in the trunk line configuration, and these ports are connected. When one terminal device is connected to only one of the ports, it is configured to specify that the terminal device is indirectly connected to the trunk line device having the one port via the non-main line device. It was done.

Further, in one configuration example of the network configuration specifying device according to the present invention, the terminal device specifying unit is connected to two trunk line devices facing each port in the trunk line configuration, and these ports are connected. When a plurality of terminal devices are connected to only one of the ports, the trunk line device having the port with the smallest number of trunk line devices associated with the port among the ports associated with the terminal device is selected. It is configured to identify that the terminal device is indirectly connected via a non-main line device.

Further, one configuration example of the network configuration specifying device according to the present invention further includes a visualization processing unit that generates visualization data that visualizes the network configuration based on the network configuration information generated by the terminal device specifying unit. The visualization data includes a notation including an icon indicating the connected device, an address information of the connected device, and a port number of the network device to which the connected device is connected, which are generated for each connected device, and these notations. Is composed of a connection line that connects in a tree format hierarchically according to the connection form of the connection device.

Further, the network configuration specifying method according to the present invention includes MAC address information indicating all MAC addresses of connected devices consisting of network devices and terminal devices connected to the IP network, and MAC address table information acquired from the network devices. Port-address indicating the correspondence between the port of the network device and the MAC address of the connected device connected to the port, which is included in the MAC address table information of the network device and the storage circuit configured to store A network configuration specifying method used in a network configuration specifying device including a control circuit configured to specify a network configuration indicating a connection form related to a connected device based on correspondence information and MAC address information. The control circuit is configured to specify the trunk line configuration indicating the connection form of the trunk line device for which the MAC address table information can be acquired among the network devices based on the port-address correspondence information and the MAC address information. Based on the step and control circuit of port-address correspondence information, MAC address information, and trunk line configuration, terminal devices that are directly connected to trunk line devices and non-trunk line devices other than trunk line devices among network devices are selected. It includes a terminal device identification step configured to identify a terminal device indirectly connected to the trunk line device via the network.

According to the present invention, it is possible to specify the network configuration even when a network device that does not support the acquisition of MAC address table information is included.

FIG. 1 is a block diagram showing a configuration of a network configuration specifying device. FIG. 2 is an explanatory diagram showing an example of an IP network configuration. FIG. 3 is an explanatory diagram showing an address assigned to each connected device of FIG. 2. FIG. 4 is a flowchart showing a network configuration specifying process. FIG. 5 is an explanatory diagram showing an address search operation. FIG. 6 is an explanatory diagram showing a MAC address table update operation. FIG. 7 is an explanatory diagram showing a MAC address table acquisition operation. FIG. 8 is an explanatory diagram showing a configuration example of MAC address table information (SW # A). FIG. 9 is an explanatory diagram showing a configuration example of MAC address table information (SW # B). FIG. 10 is an explanatory diagram showing a configuration example of MAC address table information (SW # C). FIG. 11 is a flowchart showing a trunk line configuration specifying process. FIG. 12 is an explanatory diagram showing an example of trunk line configuration specifying processing. FIG. 13 is an explanatory diagram showing an example of trunk line configuration specifying processing (when there are a plurality of terminal trunk line devices). FIG. 14 is a flowchart showing a terminal device identification process. FIG. 15 is a flowchart (continued) showing a terminal device identification process. FIG. 16 is an explanatory diagram showing a specific example of a terminal device (direct connection). FIG. 17 is an explanatory diagram showing a specific example of a terminal device (indirect connection). FIG. 18 is an explanatory diagram showing a specific example of a terminal device (connection between trunk line devices). FIG. 19 is an explanatory diagram showing an example of visualization of network configuration information.

Next, an embodiment of the present invention will be described with reference to the drawings.
[Network configuration identification device]
First, with reference to FIG. 1, the network configuration specifying device 10 according to the first embodiment of the present invention will be described. FIG. 1 is a block diagram showing a configuration of a network configuration specifying device.
The network configuration specifying device 10 is composed of an information processing device such as a PC or a server device as a whole, and is connected to an IP network NW such as a LAN to be specified, and is a network device or a terminal device connected to the IP network NW. It is a device that identifies and visualizes the network configuration showing the connection form related to these connected devices by performing data communication with the connected devices such as.

Hereinafter, devices that control packet transfer, such as L2 (layer 2) switches, L3 (layer 3) switches, hubs, routers, and gateways, are referred to as network devices (communication control devices). In addition to information processing terminals such as PCs, various devices such as sensors, field devices, and controllers used in IoT (Internet of Things) are called terminal devices.
Among network devices, devices that can acquire MAC address table information used for packet transfer control are called trunk devices, and devices that cannot acquire them are called non-trunk devices.

Further, in the following, it is assumed that the IP network NW has the network configuration shown in FIG. 2 and the address as shown in FIG. 3 is assigned to each connected device. As shown in FIG. 2, the IP network NW is composed of five network devices and five terminal devices. FIG. 2 is an explanatory diagram showing an example of an IP network configuration. FIG. 3 is an explanatory diagram showing an address assigned to each connected device of FIG. 2.

As shown in FIG. 2, the network device is composed of three L2 switches SW # A, # B, # C and two hubs HUB # X, # Y. Of these, SW # A, # B, and #C are trunk line devices that can acquire MAC address table information, and HUB # X and # Y are non-trunk line devices that cannot acquire MAC address table information. Further, the terminal device is composed of five personal computers PCs # 0, # 1, # 2, # 3, # 4. Of these, PC # 0 corresponds to the network configuration specifying device 10.

As shown in FIG. 2, SW # A, # B, and #C each include five ports (connection ports) P1, P2, P3, P4, and P5. P5 of SW # A is connected to HUB # X, P1 of SW # A is connected to P4 of SW # C, and P4 of SW # A is connected to PC0. It is assumed that HUB # X and #Y each have five ports (connection ports). HUB # X is connected to P1 of PC # 2 and SW # B. P2 of SW # B is connected to PC # 1. P2 of SW # C is connected to HUB # Y. HUB # Y is connected to PCs # 3 and # 4.

As shown in FIG. 3, IP addresses and MAC addresses are assigned to these connected devices. For SW # A, # B, and #C, the IP addresses "192.168.1.10", "192.168.1.11", "192.168.1.12" and the MAC addresses "XX: XX: XX: XX: XX: 10", " "XX: XX: XX: XX: XX: 11" and "XX: XX: XX: XX: XX: 12" are assigned. Most general HUBs do not have an IP address or MAC address. Therefore, in the following description, it is assumed that HUB # X and #Y do not have an IP address and a MAC address. Further, in FIG. 2, the port numbers are described in HUB # X and # Y, but since HUB # X and # Y do not have MAC address table information, the port to which the connected device is connected should be specified. Can't. Therefore, the specific port numbers of HUB # X and #Y will be omitted.

For PC # 0, # 1, # 2, # 3, # 4, the IP addresses "192.168.1.100", "192.168.1.101", "192.168.1.102", "192.168.1.103", "192.168.1.104" , MAC address "ZZ: ZZ: ZZ: ZZ: ZZ: 100", "ZZ: ZZ: ZZ: ZZ: ZZ: 101", "ZZ: ZZ: ZZ: ZZ: ZZ: 102", "ZZ: ZZ: "ZZ: ZZ: ZZ: 103" and "ZZ: ZZ: ZZ: ZZ: ZZ: 104" are given.
It should be noted that these network configurations are examples for facilitating explanation, and are not limited thereto. The present invention can be similarly applied to other network configurations, and the same effects can be obtained.

[Configuration of network configuration specific device]
Next, with reference to FIG. 1, the configuration of the network configuration specifying device 10 according to the present embodiment will be described in detail.
As shown in FIG. 1, the network configuration specifying device 10 includes a communication I / F 11, an operation input circuit 12, a display circuit 13, a storage circuit 14, and a control circuit 15 as main circuit units.

[Communication I / F]
The communication I / F 11 is connected to the IP network NW via the communication line L, and obtains the address information of each connected device and the MAC address table information of the trunk line device by performing data communication with each connected device. It is configured to do.
[Operation input circuit]
The operation input circuit 12 includes an operation input device such as a keyboard, a mouse, and a touch panel, and is configured to detect an operator's operation and output it to the control circuit 15.
[Display circuit]
The display circuit 13 is composed of a screen display device such as an LCD, and is configured to display various screen information such as a menu screen, a setting screen, and a network configuration specific result screen output from the control circuit 15.

[Memory circuit]
The storage circuit 14 is composed of a storage device such as a hard disk or a semiconductor memory, and is configured to store various processing data and a program 14P used for network configuration specifying processing in the control circuit 15.
[program]
The program 14P is a program for realizing various processing units used for network configuration specifying processing in the control circuit 15 by cooperating with the CPU of the control circuit 15. This program 14P is stored in advance in the storage circuit 14 from an external device or a recording medium (both not shown) connected to the network configuration specifying device 10 via a communication line.

The main processing data stored in the storage circuit 14 includes MAC address information 14A, MAC address table information 14B, trunk line configuration information 14C, and network configuration information 14D.
[MAC address information]
The MAC address information 14A is information indicating the MAC address of each connected device, and is generally stored as a set with an IP address as shown in FIG. Since HUB # X and #Y do not have an IP address or a MAC address, they are indicated by "-".
[MAC address table information]
The MAC address table information 14B is the MAC address table information possessed by a general L2 switch, and as shown in FIGS. 8 to 10 described later, the MAC address of the port of the network device and the connected device connected to the port. Contains port-address correspondence information indicating the correspondence with. Since HUB # X and #Y do not have a MAC address, HUB # X and #Y are not included in the MAC address table information 14B.

[Main line configuration information]
The trunk line configuration information 14C is information indicating a connection form of the trunk line device that can acquire the MAC address table among the network devices. As shown in FIG. 12, which will be described later, the trunk line configuration information 14C includes an ID (for example, a MAC address) indicating the trunk line devices connected to both ends of the trunk line route and a connection port thereof for each trunk line route connecting the trunk line devices. That is, it is composed of a pair with a trunk line port.

[Network configuration information]
The network configuration information 14D is information indicating a connection form of each connected device, and indicates which network device and which terminal device is connected to which network device and further to which port. The network configuration information 14D can be visually displayed in a tree format as shown in FIG. 19 described later.

[Control circuit]
The control circuit 15 has a CPU and its peripheral circuits, and by reading the program 14P from the storage circuit 14 and cooperating with the CPU, various processing units used for the network configuration specifying process in the control circuit 15 are realized. It is configured in.
The control circuit 15 includes an address search unit 15A, a table acquisition unit 15B, a trunk line configuration specifying unit 15C, a terminal device specifying unit 15D, and a visualization processing unit 15E as main processing units.

[Address Search Unit]
The address search unit 15A searches for the address of each connected device connected to the IP network NW via the communication I / F11, acquires the MAC address from each connected device, and converts it into the MAC address information 14A of the storage circuit 14. It is configured to save. As a MAC address acquisition method, a specified IP address is obtained using a general known address resolution technology such as ARP (Address Resolution Protocol), NS (Neighbor Solicitation / IPv6), and MLD (Multicast Listener Discovery / IPv6). There is a way to get the MAC address from the device. As the IP address of each connected device, a preset IP address may be used, or IP addresses may be sequentially generated and searched within a specified range.

[Table acquisition section]
The table acquisition unit 15B acquires the MAC address table information 14B from the trunk line device capable of acquiring the MAC address table information among the network devices connected to the IP network NW via the communication I / F11, and stores the storage circuit. It is configured to be stored in 14. As a method of acquiring MAC address table information 14B, a method of acquiring MAC address table information 14B from a specified trunk line device using a general known network management protocol such as general SNMP (Simple Network Management Protocol) is used. be.

[Main line configuration specific part]
The trunk line configuration specifying unit 15C has a trunk line configuration showing a connection mode related to the trunk line device based on the MAC address information 14A of the storage circuit 14 and the port-address correspondence information included in the MAC address table information 14B of the storage circuit 14. Is specified, and the specific result is stored in the trunk line configuration information 14C of the storage circuit 14.

Specifically, the trunk line configuration specifying unit 15C confirms whether or not there is a port associated with all the MAC addresses of the trunk line devices other than the trunk line device for each trunk line device, and if there is the port, the trunk line device. Is identified as a terminal trunk line device, and for each trunk line device other than the terminal trunk line device, check whether there is a port associated with only one terminal trunk line device, and if there is a port, the trunk line device is It is identified as an intermediate trunk line device connected to the terminal trunk line device via the trunk line route, and the trunk line configuration is specified based on these identification results.

Further, the trunk line configuration specifying unit 15C confirms whether or not there is a port to which a plurality of terminal trunk line devices are associated with each trunk line device other than the terminal trunk line device, and if there is such a port, the trunk line device other than the terminal trunk line device. Among them, the port to which the terminal trunk line device is associated is selected, and among the selected ports, the trunk line device having the port with the smallest number of trunk line devices associated with the port is the terminal trunk line device and the trunk line route. It is identified as an intermediate trunk line device connected via.

[Terminal device identification part]
The terminal device identification unit 15D is based on the MAC address information 14A of the storage circuit 14, the port-address correspondence information included in the MAC address table information 14B of the storage circuit 14, and the trunk line configuration information 14C of the storage circuit 14. , The identification obtained by identifying the terminal device directly connected to the trunk line device and the terminal device indirectly connected to the trunk line device via the non-trunk line device other than the trunk line device among the network devices. Based on the result and the trunk line configuration information 14C, the network configuration information 14D indicating the connection mode of each connected device is generated and stored in the storage circuit 14.

Specifically, when one terminal device is connected to a port to which another trunk line device is not connected among the ports provided in the trunk line device, the terminal device specifying unit 15D corresponds to the terminal device. Identify that it is directly connected to the trunk line equipment. Further, in the terminal device identification unit 15D, when a plurality of terminal devices are connected to a port to which other trunk line devices are not connected among the ports provided in the trunk line device, these terminal devices are the trunk line devices. In the terminal device identification unit 15D, two trunk line devices are connected to each port facing each other in the trunk line configuration, and these are specified to be indirectly connected to each other via a non-trunk line device. When the same terminal device is commonly connected to the port of, it is specified that the terminal device is indirectly connected between the trunk line devices via the non-main line device, and the non-main line device is connected to the network configuration. To complement.

Further, in the terminal device identification unit 15D, two trunk line devices are connected to each port in the trunk line configuration, and only one terminal device is connected to only one of these ports. If so, it is specified that the terminal device is indirectly connected to the trunk line device having one of the ports via the non-main line device, and the non-main line device is complemented in the network configuration. Further, in the terminal device identification unit 15D, when two trunk line devices are connected to each port in the trunk line configuration and a plurality of terminal devices are connected to only one of these ports. , Identify that the terminal device is indirectly connected to the trunk line device that has the port with the smallest number of trunk line devices associated with the port among the ports associated with the terminal device. Complement the non-main line equipment to the network configuration.

[Visualization processing unit]
The visualization processing unit 15E is configured to generate visualization data that visualizes the network configuration of the IP network NW based on the network configuration information 14D of the storage circuit 14 obtained by the terminal device identification unit 15D. At this time, the visualization data includes a notation including an icon indicating the connected device, address information of the connected device, and a port number of the network device to which the connected device is connected, and these notations generated for each connected device. It is composed of connection lines that connect in a tree format hierarchically according to the connection form of the connected device.
As a result, by displaying the obtained visualization data on the screen on the display circuit 13, the network configuration display screen as shown in FIG. 19 to be described later is visually displayed. When the visualization processing unit 15E is used for screen display or the like on another PC instead of the display circuit 13, the communication I / F 11 may be transferred and output to the other PC via the IP network NW.

[Operation of this embodiment]
Next, with reference to FIG. 4, the operation of the network configuration specifying method of the network configuration specifying device 10 according to the present embodiment will be described. FIG. 4 is a flowchart showing a network configuration specifying process.
The control circuit 15 of the network configuration specifying device 10 executes the network configuration specifying process of FIG. 4 in response to an operator instruction from the operation input circuit 12. In the following, it is assumed that each connected device is connected by the network configuration of FIG. 2 described above.

First, the control circuit 15 uses the address search unit 15A to search the address range of each connected device connected to the IP network NW via the communication I / F11 in a round-robin manner, and obtains MAC addresses from all the connected devices. Acquired and stored in the MAC address information 14A of the storage circuit 14 (step S100).
FIG. 5 is an explanatory diagram showing an address search operation. When searching for the address of SW # B, as shown in FIG. 5, first, when the network configuration specifying device 10 (PC # 0) sends an ARP request specifying the IP address of SW # B (step S200), An APR response including the MAC address is returned from SW # B (step S201). The MAC address is extracted from this ARP response and stored in the MAC address information 14A as the MAC address of SW # B.

Next, the control circuit 15 requests the IP network NW via the communication I / F11 by the table acquisition unit 15B to specify a fictitious IP address that does not exist as a connection device as a transmission source for communication confirmation of the communication path. Is performed to update the MAC address table of each trunk line device (step S101).
FIG. 6 is an explanatory diagram showing a MAC address table update operation. As shown in FIG. 6, first, the network configuration specifying device 10 (PC # 0) transmits a ping command in which a fictitious IP address is specified as a source (step S210). The trunk line device that has received the ping command, for example, SW # B, broadcasts an ARP request to each connected device (step S211). As a result, the ARP request reaches the network devices SW # A and SW # C, so that the MAC address tables of the trunk line devices SW # A, # B and # C are updated.

Generally, in a network device such as an L2 switch that interprets a MAC address, when a MAC frame for another terminal device is received from one terminal device, the source MAC address included in the MAC frame and the receiving port of the MAC frame are received. By learning the pair with and registering it in its own MAC address table (FDB: Forwarding Data Base), the destination port of the MAC frame is efficiently determined. The registered contents are automatically deleted after the aging time has elapsed. The aging time can be set variably, but is generally about 300 seconds. Therefore, by updating the MAC address table of each trunk line device by confirming the communication of the communication path prior to the acquisition of the MAC address table information 14B, the latest MAC address table information 14B can be acquired.

Subsequently, the control circuit 15 acquires the MAC address table information 14B from each trunk line device via the communication I / F 11 by the table acquisition unit 15B, and stores the MAC address table information 14B in the storage circuit 14 (step S102).
FIG. 7 is an explanatory diagram showing a MAC address table acquisition operation. As shown in FIG. 7, first, when a network configuration specifying device 10 (PC # 0) transmits a MAC address table reference request to SW # B using, for example, SNMP (step S220), the MAC address is sent from SW # B. The table information 14B is returned (step S221). As a result, the returned MAC address table information 14B is stored in the storage circuit 14.

FIG. 8 is an explanatory diagram showing a configuration example of MAC address table information (SW # A). FIG. 9 is an explanatory diagram showing a configuration example of MAC address table information (SW # B). FIG. 10 is an explanatory diagram showing a configuration example of MAC address table information (SW # C). As shown in FIGS. 8 to 10, the MAC address table information 14B includes port-address correspondence information indicating the correspondence between the port of the network device and the MAC address of the connected device connected to the port. There is. For example, as shown in FIG. 8, SW # C, PC # 3, and PC # 4 are associated with P1 and PC # 0 is associated with P4 in the MAC address table information 14B of SW # A. SW # B, PC # 1 and PC # 2 are associated with P5.

Next, the control circuit 15 executes the trunk line configuration specifying process shown in FIG. 11 to be described later by the trunk line configuration specifying unit 15C, whereby the MAC address information 14A of the storage circuit 14 and the MAC address table information 14B of the storage circuit 14 are executed. Based on the port-address correspondence information included in, the trunk line configuration indicating the connection form related to the trunk line device is specified, and the specific result is saved in the trunk line configuration information 14C of the storage circuit 14 (step S103: trunk line configuration specifying step). ).

Subsequently, the control circuit 15 executes the terminal device identification process shown in FIG. 14, which will be described later, by the terminal device identification unit 15D, so that the port-address correspondence information included in the MAC address table information 14B of the storage circuit 14 And, based on the trunk line configuration information 14C of the storage circuit 14, the terminal device directly connected to the trunk line device and the network device are indirectly connected to the trunk line device via the non-trunk line device other than the trunk line device. The network configuration information 14D is generated based on the obtained specific result and the trunk line configuration information 14C, and stored in the storage circuit 14 (step S104: terminal device identification step).

After that, the control circuit 15 generates visualization data from the network configuration information 14D of the storage circuit 14 generated by the terminal device identification unit 15D by the visualization processing unit 15E, and displays the visualization data on the screen on the display circuit 13 (step S105). , Ends a series of network configuration identification processes.
As a result, the network configuration display screen as shown in FIG. 19, which will be described later, is visually displayed on the display circuit 13.

[Main line configuration identification process]
Next, with reference to FIG. 11, the trunk line configuration specifying process in step S103 of FIG. 4 will be described in detail. FIG. 11 is a flowchart showing a trunk line configuration specifying process.
First, the trunk line configuration specifying unit 15C identifies the terminal trunk line device located at the end of the trunk line route by steps S120 to S124 of FIG.
That is, the trunk line configuration specifying unit 15C selects one unselected trunk line device from all the trunk line devices SW # A, SW # B, and SW # C (step S120).
Subsequently, the trunk line configuration specifying unit 15C refers to the MAC address table information 14B of the selected trunk line device (step S121), and all the other trunk line devices among the ports provided in the trunk line device are associated with each other. It is confirmed whether or not there is a port (step S122).

Here, when there is a port to which all other trunk line devices are associated (step S122: YES), the trunk line configuration specifying unit 15C identifies the trunk line device as a terminal trunk line device (step S123), which will be described later. The process proceeds to step S124. On the other hand, when there is no port to which all the other trunk line devices are associated (step S122: NO), the process proceeds to step S124 described later.
After that, in step S124, the trunk line configuration specifying unit 15C confirms the presence or absence of the unselected trunk line device (step S124), and if there is an unselected trunk line device (step S124: YES), returns to step S120. On the other hand, when there is no unselected trunk line device (step S124: NO), the process proceeds to step S125 described later.

Next, the trunk line configuration specifying unit 15C identifies an intermediate trunk line device connected to the terminal trunk line device by steps S125 to S130 of FIG.
First, in step S125, the trunk line configuration specifying unit 15C selects one unselected trunk line device from the unspecified trunk line devices other than the terminal trunk line device (step S125).
Subsequently, the trunk line configuration specifying unit 15C refers to the MAC address table information 14B of the selected trunk line device (step S126), and among the ports provided in the trunk line device, the associated terminal trunk line device is used. Check for the presence or absence of only one port (step S127). At this time, a connected device other than the terminal trunk line device may be associated with the port.

Here, when there is a port to which only one terminal trunk line device is associated (step S127: YES), the trunk line configuration specifying unit 15C identifies the trunk line device as an intermediate trunk line device (step S128). The process proceeds to step S129, which will be described later. On the other hand, when there is no port to which only one terminal trunk line device is associated (step S127: NO), the process proceeds to step S129 described later.
After that, in step S129, the trunk line configuration specifying unit 15C confirms the presence or absence of an unselected trunk line device among the unspecified trunk line devices (step S129), and if there is an unselected trunk line device (step S129: YES). ), Return to step S125. On the other hand, when there is no unselected trunk line device (step S129: NO), the process proceeds to step S130 described later.

Next, the trunk line configuration specifying unit 15C identifies the trunk line configuration indicating the connection form of the trunk line device based on the specific result of the terminal trunk line device and the intermediate trunk line device identified in this way, and identifies the trunk line configuration indicating the connection form of the trunk line device, and is intermediate between the terminal trunk line device and the intermediate trunk line device. For each trunk line route connecting to the trunk line equipment, an ID (for example, MAC address) indicating the trunk line equipment connected to both ends of the trunk line device and a trunk line configuration information 14C composed of a set of the connection port, that is, the trunk line port are generated. And store it in the storage circuit 14 (step S130).

FIG. 12 is an explanatory diagram showing an example of trunk line configuration specifying processing. First, referring to the MAC address table information 14B of SW # B, all of SW # A and #C are associated with P1, and SW # B is associated with all other trunk line devices. Port P1 is present. As a result, the trunk line device is not connected before SW # B, and SW # B is identified as the terminal trunk line device (step S230).

Similarly, referring to the MAC address table information 14B of SW # C, all of SW # A and #B are associated with P4, and SW # C is associated with all other trunk line devices. The existing port P4 exists. As a result, the trunk line device is not connected before SW # C, and SW # C is identified as the terminal trunk line device (step S231).

Next, referring to the MAC address table information 14B of SW # A other than SW # B and #C specified as the terminal trunk line device, SW # A has 1 associated terminal trunk line device SW # B. There is only one P5 and P1 having only one associated terminal trunk line device SW # C. Thereby, SW # A is identified as an intermediate trunk line device connected to the terminal trunk line devices SW # B and #C (step S232).

From these identification results, the trunk line configuration in which the terminal trunk line devices SW # B and #C are connected to the intermediate trunk line devices SW # A, respectively, is specified. As a result, P5 of SW # A and P1 of SW # B are connected to both ends of the trunk path L1 connecting SW # A and SW # B, and the trunk path L2 connecting SW # A and SW # C is connected. Trunk line configuration information 14C indicating that P1 of SW # A and P4 of SW # C are connected is generated at both ends.
By the above processing, as shown in FIG. 12, the network configuration in which SW # B and #C are connected to SW # A via the trunk routes L1 and L2 has been specified.

Although the case where the intermediate trunk line device is only SW # A has been described as an example in FIGS. 11 and 12, a trunk line configuration in which the intermediate trunk line devices are hierarchically connected is also conceivable. In this case, the intermediate trunk line device identification process shown in steps S125 to S129 of FIG. 11 may be repeatedly executed. At this time, in step S127, it may be confirmed whether or not there is a port having only one identified intermediate trunk line device associated with the terminal trunk line device instead of the terminal trunk line device. This makes it possible to specify the trunk line route between the intermediate trunk line devices.

Further, in the intermediate trunk line device, when a plurality of terminal trunk line devices are connected to one port, the connection form cannot be specified by the terminal trunk line device identification processes shown in steps S120 to S124 of FIG. For example, in the trunk line configuration example of FIG. 13, two terminal trunk line devices SW # B and SW # D are associated with P5 of SW # A via HUB # X. FIG. 13 is an explanatory diagram showing an example of trunk line configuration specifying processing (when there are a plurality of terminal trunk line devices).

In such a case, check the port of the other MAC address table information 14B to which these terminal trunk line devices are associated. For example, in the case of FIG. 13, P5 of SW # A and P4 of SW # C are targeted. Next, among these ports, the trunk line device having the port with the least number of associated trunk line devices may be selected as the intermediate trunk line device to be connected. In the case of FIG. 13, two trunk lines of SW # B and #D are associated with P5 of SW # A, and three trunk lines of SW # A, # B and #D are associated with P4 of SW # C. Devices are associated. Therefore, SW # B and #D can be identified as being connected to the intermediate trunk line device SW # A via an arbitrary HUB. At this time, in the example of FIG. 13, any HUB corresponds to HUB # X, but since it does not have an IP address and a MAC address, it cannot be specified that any HUB is HUB # X.

[Terminal device identification processing]
Next, with reference to FIGS. 14 and 15, the terminal device identification process in step S104 of FIG. 4 will be described in detail. FIG. 14 is a flowchart showing a terminal device identification process. FIG. 15 is a flowchart showing a terminal device identification process (continued).
First, as shown in FIG. 14, the terminal device identification unit 15D selects one unselected terminal device from all the terminal device PCs # 0, # 1, # 2, # 3, # 4 ( Step S140).
Subsequently, the terminal device specifying unit 15D confirms the port of the trunk line device to which the selected terminal device is connected from each MAC address table information 14B (step S141), and the terminal device is other than the trunk line port. Check if it is associated with the port (step S142). The trunk line port is a port to which the trunk line route is connected among the ports provided in the trunk line equipment.

When the terminal device is associated with a port other than the trunk line port (step S142: YES), the terminal device identification unit 15D confirms whether only one terminal device is associated with the port (step S142: YES). Step S143). At this time, a connected device other than the terminal device may be associated with the port.
When there is only one terminal device associated with the port (step S143: YES), the terminal device identification unit 15D specifies the port as the connection destination of the terminal device, that is, the terminal device is the terminal device. It is specified that the port is directly connected to the port of the trunk line device (step S144), and the process proceeds to step S160 described later.

FIG. 16 is an explanatory diagram showing a specific example of a terminal device (direct connection). In the network configuration example of FIG. 16, it can be seen that among the trunk line devices SW # B, P1 to which the trunk line path L1 is connected is the trunk line port based on the trunk line configuration information 14C. In SW # B, among P2, P3, P4, and P5 other than P1, the terminal device associated with P2 is only one of PC # 1. Therefore, PC # 1 is specified to be directly connected to P2 of SW # B.
By the above processing, as shown in FIG. 16, in addition to FIG. 12, the network configuration in which the PC # 1 is connected to the SW # B has been specified.

On the other hand, in step S143, when there is not only one terminal device associated with the port, that is, when a plurality of terminal devices are associated with the port (step S143: NO), the terminal device identification unit. 15D complementarily connects the non-trunk device to the port (step S145), identifies the non-trunk device as the connection destination of these terminal devices, that is, the terminal device is the trunk line device via the non-trunk device. It is specified that it is indirectly connected to the port (step S146), and the process proceeds to step S160 described later.

FIG. 17 is an explanatory diagram showing a specific example of a terminal device (indirect connection). In the network configuration example of FIG. 17, it can be seen that among the trunk line devices SW # C, P4 to which the trunk line path L2 is connected is the trunk line port based on the trunk line configuration information 14C. In SW # C, among P1, P2, P3, and P5 other than P4, the terminal devices associated with P2 are PC # 3 and # 4. Thereby, PCs # 3 and # 4 are identified to be indirectly connected to P2 of SW # C via an arbitrary HUB. At this time, in the example of FIG. 17, any HUB corresponds to HUB # Y, but since it does not have an IP address and a MAC address, it cannot be specified that any HUB is HUB # Y.
By the above processing, as shown in FIG. 17, in addition to FIG. 16, the network configuration in which PCs # 3 and # 4 are connected to SW # C via an arbitrary HUB has been specified.

Further, in step S142, when the terminal device is not associated with a port other than the trunk line port, that is, when the terminal device is associated with the trunk line port (step S142: NO), as shown in FIG. In the terminal device identification unit 15D, the same terminal device is associated with the opposite trunk line port on the opposite trunk line device side which is connected to the trunk line port via the trunk line path, that is, both of the opposite trunk line devices. It is confirmed whether the terminal device is associated with (step S150).

Here, when the terminal device is associated with both of the opposite trunk line devices (step S150: YES), the terminal device specifying unit 15D complementarily connects the non-trunk line device to the trunk line port (step S151), and the non-trunk line device is connected. The trunk line device is specified as the connection destination between the terminal device and the opposite trunk line device, that is, the terminal device and the opposite trunk line device are indirectly connected to the trunk line port of the trunk line device via the non-trunk line device. (Step S152), the process proceeds to step S160 described later. If the non-main line equipment has already been supplemented, no further supplementation will be made.

On the other hand, when the same terminal device is not associated with the opposite trunk line port, that is, the terminal device is associated with only one of the corresponding trunk line devices (step S150: NO), the terminal device identification unit 15D , Check if only one terminal device is associated with the trunk port (step S153).
Here, when only one terminal device is associated with the trunk line port (step S153: YES), the terminal device identification unit 15D complementarily connects the non-trunk line device to the trunk line port (step S154), and the terminal device identification unit 15D is connected to the trunk line port. When the non-trunk device is specified as the connection destination between the terminal device and the opposite trunk line device, that is, the terminal device and the opposite trunk line device are indirectly connected to the trunk line port of the trunk line device via the non-trunk line device. It is specified (step S155), and the process proceeds to step S160 described later. If the non-main line equipment has already been supplemented, no further supplementation will be made.

On the other hand, when a plurality of the terminal devices are associated with the trunk line port (step S153: NO), the terminal device identification unit 15D is associated with the port for each port to which these terminal devices are associated. The number of trunk line devices is confirmed (step S156), the non-trunk line device is complementarily connected to the port with the smallest number of trunk line devices (step S157), and the non-trunk line device is specified as the connection destination between the terminal device and the opposite trunk line device. That is, it is specified that the terminal device and the opposite trunk line device are indirectly connected to the trunk line port of the trunk line device via the non-trunk line device (step S158), and the process proceeds to step S160 described later. If the non-main line equipment has already been supplemented, no further supplementation will be made.

In step S160, the terminal device specifying unit 15D confirms the presence / absence of an unselected terminal device (step S160), and if there is an unselected terminal device (step S160: YES), returns to step S140.
On the other hand, when there is no unselected terminal device (step S160: NO), the terminal device specifying unit 15D is a network of the entire IP network NW based on the trunk line configuration information 14C of the storage circuit 14 and the specific result of each terminal device. The network configuration information 14D indicating the configuration is generated and stored in the storage circuit 14 (step S161), and a series of terminal device identification processes are completed.

FIG. 18 is an explanatory diagram showing a specific example of a terminal device (connection between trunk line devices). In the network configuration example of FIG. 18, the trunk line device SW # A and the trunk line device SW # B face each other to P5 of SW # A and P1 of SW # B via the trunk line path L1 based on the trunk line configuration information 14C. It can be seen that these are trunk ports. Further, the same terminal device PC # 2 is associated with both P5 of SW # A and P1 of SW # B. Thereby, the PC # 2 is specified to be indirectly connected to the P2 of the SW # C via an arbitrary HUB. In the example of FIG. 18, any HUB corresponds to HUB # X, but since it does not have an IP address and a MAC address, it cannot be specified that any HUB is HUB # X. If non-main line equipment has already been supplemented, no further supplementation will be made.

In FIG. 18, the case where the same terminal device PC # 2 is associated with both P5 of SW # A and P1 of SW # B has been described as an example, but in some cases, one of the SWs is used. PC # 2 may be associated only with P5 of # A, and PC # 2 may not be associated with P1 of the other SW # B. In such a case, if there is only one associated terminal device, PC # 2, any non-trunk device (specifically, directly under SW # A to which PC # 2 is associated). Is a switch that cannot acquire MAC address table information), and it may be specified that PC # 2 is indirectly connected via this arbitrary non-trunk device. At this time, since the non-main line device does not have an IP address and a MAC address, it is not possible to specify any non-main line device. If non-main line equipment has already been supplemented, no further supplementation will be made.

Further, a plurality of terminal devices may be associated only with P5 of SW # A. In such a case, among all the MAC address table information 14B, for each port to which these plurality of terminal devices are associated, the number of trunk line devices associated with the port is confirmed, and the number of trunk line devices is checked. Any HUB may be complementarily connected directly under the trunk line device having the fewest ports, and it may be specified that a plurality of terminal devices are indirectly connected via this arbitrary HUB. For example, in FIG. 18, when a plurality of terminal devices including PC # 2 are connected to HUB # X, the trunk line between P5 of SW # A and P4 of SW # C to which these terminal devices are associated. The number of devices is confirmed. In this case, since the number of trunk line devices of P5 of SW # A is 1 and the number of P4 trunk line devices of SW # C is 2, these terminal devices are arbitrary for P5 of SW # A, which has the smallest number of trunk line devices. It may be specified that the connection is indirectly made via the HUB. At this time, since the HUB does not have an IP address and a MAC address, any HUB cannot be specified. If non-main line equipment has already been supplemented, no further supplementation will be made.

By the above processing, all the connected devices have been identified, and as shown in FIG. 18, in addition to FIG. 17, PC # 2 and SW # B indirectly connect to SW # A via an arbitrary HUB. The network configuration connected to, that is, the network configuration of the entire IP network NW has been specified.

FIG. 19 is an explanatory diagram showing an example of screen display of network configuration information. In FIG. 19, each connected device included in the network configuration of FIG. 5 described above is visually displayed in a tree format hierarchically line by line. Each line contains icons (symbols) 31, 32, 33 indicating the connected device, port number 34 of the network device to which the connected device is connected, and address information 35 of the connected device such as an IP address or MAC address. Has been done.

Of these, icons 31, 32, and 33 use symbols and colors according to the type of connected device. For example, icon 31 indicates a trunk line device such as an L2 switch or L3 switch, and icon 32 indicates a non-hub or the like. The trunk line switch is shown, and the icon 33 indicates a terminal device such as a PC. As a result, the type of connected device can be easily identified just by looking at the icon, and for example, it is possible to check the trouble occurrence status and immediately identify the connected device to be maintained.

Further, the icons 31, 32, and 33 are hierarchically connected by the connection line 36, so that the connection form of each connected device can be easily grasped. Further, a folding symbol 37 is arranged at a connection point of the connection line 36 to which a network device is connected. By operating the folding symbol 37, it is possible to switch the display / non-display of the device connected under the network device. As a result, extra connected devices can be hidden, and even if the network configuration is complicated, the target connected devices can be displayed in an easy-to-see manner.

Further, the port number 34 of each line makes it possible to easily and concretely grasp which port of the network device to which the connected device is connected. As a result, based on the port number 34 and the address information 35, it is possible to easily start work and preparation such as confirmation and maintenance of the trouble occurrence status for the connected device.
In FIG. 19, the notation including the icons 31, 32, 33, the port number 34, and the address information 35 for each connected device has been described as an example of the case where the notation including the address information 35 is displayed along the line, but the present invention is limited to this. It's not a thing. For example, the notation for each connected device is displayed for each connected device in a free position instead of a line-dependent position, and these are displayed hierarchically in a tree format according to the connection form of each connected device by the connection line 36. It may be displayed to connect.

[Effect of this embodiment]
As described above, in the present embodiment, in the control circuit 15, the trunk line configuration specifying unit 15C is among the network devices based on the port-address correspondence information and the MAC address information 14A included in the MAC address table information 14B. The trunk line configuration indicating the connection form of the trunk line device for which the MAC address table information 14B can be acquired is specified, and the terminal device identification unit 15D performs the port-address correspondence information, the MAC address information 14A, and the trunk line included in the MAC address table information 14B. Based on the configuration, identify the terminal device that is directly connected to the trunk line device and the terminal device that is indirectly connected to the trunk line device via the non-trunk line device other than the trunk line device among the network devices. It is configured as follows.

As a result, after the connection form related to the trunk line device for which the MAC address table information 14B can be acquired, that is, the trunk line configuration is specified, the connected device directly or indirectly connected to these trunk line devices is specified. Therefore, even when a network device that does not support the acquisition of the MAC address table information 14B, that is, a non-main line device is included, it is possible to specify the network configuration.

Further, in the present embodiment, the trunk line configuration specifying unit 15C confirms whether or not there is a port to which all the MAC addresses of the trunk line devices other than the trunk line device are associated with each trunk line device, and if there is the port, the port is present. Identify the trunk line device as the terminal trunk line device, check whether there is a port associated with only one terminal trunk line device for each trunk line device other than the terminal trunk line device, and if there is the port, the trunk line. The device may be identified as an intermediate trunk line device connected to the terminal trunk line device via a trunk line route, and the trunk line configuration may be specified based on these identification results. This makes it possible to accurately identify the trunk line configuration.

Further, in the present embodiment, the trunk line configuration specifying unit 15C confirms whether or not there is a port to which a plurality of terminal trunk line devices are associated with each trunk line device other than the terminal trunk line device, and if there is such a port, the terminal trunk line. Among the trunk line devices other than the device, the port to which the terminal trunk line device is associated is selected, and among the selected ports, the trunk line device having the port with the smallest number of trunk line devices associated with the port is It may be specified as an intermediate trunk line device connected to the terminal trunk line device via the trunk line route. This makes it possible to more accurately identify the trunk line configuration.

Further, in the present embodiment, when one terminal device is connected to the port to which the other trunk line device is not connected among the ports provided in the trunk line device, the terminal device specifying unit 15D is the terminal. The device may be configured to identify that it is directly connected to the trunk line device. This makes it possible to accurately identify the terminal device that is directly connected to the trunk line device.

Further, in the present embodiment, when a plurality of terminal devices are connected to the port to which the other trunk line device is not connected among the ports provided in the trunk line device, the terminal device specifying unit 15D is used. The terminal device may be configured to identify that it is indirectly connected to the trunk line device via the non-trunk line device. This makes it possible to accurately identify the terminal device indirectly connected to the trunk line device.

Further, in the present embodiment, the terminal device specifying unit 15D has two trunk line devices connected to each port facing each other in the trunk line configuration, and the same terminal device is commonly connected to these ports. If so, it may be configured to specify that the terminal device is indirectly connected between the trunk line devices via the non-main line device. This makes it possible to accurately identify terminal devices indirectly connected between trunk line devices via non-main line devices.

[Extension of embodiment]
Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the structure and details of the present invention within the scope of the present invention. In addition, each embodiment can be implemented in any combination within a consistent range.

10 ... Network configuration specifying device, 11 ... Communication I / F, 12 ... Operation input circuit, 13 ... Display circuit, 14 ... Storage circuit, 14A ... MAC address information, 14B ... MAC address table information, 14C ... Trunk line configuration information, 14D ... network configuration information, 14P ... program, 15 ... control circuit, 15A ... address search unit, 15B ... table acquisition unit, 15C ... trunk line configuration specification unit, 15D ... terminal device identification unit, 15E ... visualization processing unit, NW ... IP network , L1, L2 ... Trunk route, 31, 32, 33 ... Icon, 34 ... Port number, 35 ... Address information, 36 ... Connection line, 37 ... Folding symbol.

Claims (10)

A storage circuit configured to store MAC address information indicating all MAC addresses of connected devices consisting of network devices and terminal devices connected to an IP network, and MAC address table information acquired from the network devices. ,
Based on the port-address correspondence information including the MAC address table information of the network device, which indicates the correspondence relationship between the port of the network device and the MAC address of the connected device connected to the port, and the MAC address information. A control circuit configured to specify a network configuration indicating a connection form related to the connected device is provided.
The control circuit is configured to specify a trunk line configuration indicating a connection mode of the trunk line device for which the MAC address table information can be acquired among the network devices based on the port-address correspondence information and the MAC address information. With the trunk line configuration specific part
Based on the port-address correspondence information, the MAC address information, and the trunk line configuration, a terminal device directly connected to the trunk line device and a non-trunk line device other than the trunk line device among the network devices are used. A terminal configured to identify a terminal device indirectly connected to the trunk line device and generate network configuration information indicating the network configuration based on the obtained specific result and the trunk line configuration. A network configuration identification device characterized by having a device identification unit. In the network configuration specifying device according to claim 1,
The trunk line configuration specifying unit confirms whether or not there is a port associated with all the MAC addresses of trunk line devices other than the trunk line device for each trunk line device, and if there is a port, the trunk line device is the terminal trunk line device. For each trunk line device other than the terminal trunk line device, it is confirmed whether or not there is a port associated with only one terminal trunk line device, and if there is a port, the trunk line device is the terminal. A network configuration specifying device characterized in that it is identified as an intermediate trunk line device connected to a trunk line device via a trunk line route, and the trunk line configuration is specified based on these identification results. In the network configuration specifying device according to claim 2,
The trunk line configuration specifying unit confirms whether or not there is a port to which a plurality of the terminal trunk line devices are associated with each trunk line device other than the terminal trunk line device, and if there is a port, the trunk line device other than the terminal trunk line device. Among the ports, the port to which the terminal trunk line device is associated is selected, and among the selected ports, the trunk line device having the port with the smallest number of trunk line devices associated with the port is the terminal trunk line device. A network configuration specifying device characterized in that it is identified as an intermediate trunk line device connected via a trunk line route. In the network configuration specifying device according to any one of claims 1 to 3.
When one terminal device is connected to a port to which another trunk line device is not connected among the ports provided in the trunk line device, the terminal device specifying unit directly connects the terminal device to the trunk line device. A network configuration specifying device characterized in that it is identified as being connected. In the network configuration specifying device according to any one of claims 1 to 4.
When a plurality of terminal devices are connected to a port to which other trunk line devices are not connected among the ports provided in the trunk line device, the terminal device specifying unit attaches these terminal devices to the trunk line device. A network configuration specifying device characterized in that it is identified as being indirectly connected via a non-main line device. In the network configuration specifying device according to any one of claims 1 to 5.
In the terminal device identification unit, when two trunk line devices are connected to each port facing each other in the trunk line configuration and the same terminal device is commonly connected to these ports, the terminal is said to be the terminal. A network configuration specifying device characterized in that a device is specified to be indirectly connected between the trunk line devices via a non-main line device. In the network configuration specifying device according to any one of claims 1 to 6.
In the terminal device identification unit, when two trunk line devices are connected to each port in the trunk line configuration and one terminal device is connected to only one of these ports. , A network configuration specifying device, characterized in that the terminal device is indirectly connected to a trunk line device having one of the ports via a non-main line device. In the network configuration specifying device according to any one of claims 1 to 7.
In the terminal device identification unit, when two trunk line devices are connected to each port in the trunk line configuration and a plurality of terminal devices are connected to only one of these ports. Among the ports associated with the terminal device, the terminal device is indirectly connected to the trunk line device having the port with the smallest number of trunk line devices associated with the port via the non-trunk line device. A network configuration specifying device characterized by being identified as being present. In the network configuration specifying device according to any one of claims 1 to 8.
Further provided with a visualization processing unit that generates visualization data that visualizes the network configuration based on the network configuration information generated by the terminal device identification unit.
The visualization data includes a notation including an icon indicating the connected device, address information of the connected device, and a port number of the network device to which the connected device is connected, which is generated for each connected device, and these notations are described above. A network configuration specifying device characterized by being composed of connection lines that are hierarchically connected in a tree format according to the connection form of the connected device. A storage circuit configured to store MAC address information indicating all MAC addresses of connected devices consisting of network devices and terminal devices connected to the IP network, and MAC address table information acquired from the network devices. , The port-address correspondence information including the MAC address table information of the network device, which indicates the correspondence relationship between the port of the network device and the MAC address of the connected device connected to the port, and the MAC address information. Based on this, it is a network configuration specifying method used in a network configuration specifying device including a control circuit configured to specify a network configuration indicating a connection form relating to the connected device.
The control circuit is configured to specify a trunk line configuration indicating a connection mode of the trunk line device for which the MAC address table information can be acquired among the network devices based on the port-address correspondence information and the MAC address information. The main line configuration identification step and
A terminal device in which the control circuit is directly connected to the trunk line device based on the port-address correspondence information, the MAC address information, and the trunk line configuration, and the network device other than the trunk line device. To identify a terminal device indirectly connected to the trunk line device via a non-trunk line device, and to generate network configuration information indicating the network configuration based on the obtained specific result and the trunk line configuration. A network configuration identification method characterized by comprising a terminal device identification step configured in.

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