JP5444174B2 - Network visualization device - Google Patents

Description

  The present invention relates to a network state visualization technique.

  Conventionally, there is a technique for visualizing a connection configuration (hereinafter referred to as topology) of a network such as an IP (Internet Protocol) network, route information, traffic information, and the like using a GUI (Graphical User Interface) (Non-Patent Document 1). reference). In addition, by analyzing the traffic generated between devices (nodes) on the ground (hereinafter referred to as “flow”), the route of the flow, and the amount of traffic in time series, analysis of the bottleneck and equipment There is also a technology that enables a network administrator to intuitively determine the location of an extension or analyze the impact at the time of failure on the screen (see Non-Patent Document 2). For example, the traffic volume of each flow in the network, the route of the flow, and the change in the traffic volume of the time series are displayed by using a traffic information list screen, a topology screen, a ground traffic screen, etc. 1).

Mitsuaki, Kamamura, Shiraishi, Oki, Shiomoto, Takenaka, "Development of Multi-layer TE Visualization System", IEICE PN Study Group, May 2007 Kojima et al., “Proposal of Network Design and Operation Method Using Exchange Traffic”, 2009 National Congress of Science, B-6-9, March 2009

  However, since the flows in the network exist in proportion to the square of the number of nodes, even if the analysis target for each flow is limited, displaying the analysis results for the entire network on the screen results in an enormous amount of information. It becomes difficult for the administrator to perform network state analysis. For example, when there are many flows via the device A in FIG. 1, the number of flows displayed on the topology screen and the ground-to-ground traffic screen becomes enormous, which makes it difficult for the administrator to visually grasp. Accordingly, an object of the present invention is to provide a network visualization means that solves the above-described problems and makes it easy for a network administrator to visually grasp network flow information.

In order to solve the above-described problem, the network visualization device according to the present invention includes topology information indicating a connection state of each node constituting the network and a link connecting each node, and a flow start point for each flow flowing through the network. The route information indicating the identification information of the link between the node and the end point node and the start point node and the end point node and the traffic information indicating the traffic amount of each flow are received and stored in the storage unit. The network visualization device includes a screen display processing unit. The screen display processing unit refers to the topology information and the route information, and displays a topology screen showing a flow flowing between the nodes on the network topology. To display. In addition, referring to the traffic information, a ground-to-ground traffic screen showing the transition of the traffic amount of each flow every predetermined time is displayed. Further, a traffic information list screen showing a list of traffic amounts of each flow at a predetermined time is displayed on the display device. The network visualization device includes a flow display control unit, and when the flow display control unit receives a selection input of a node or a link and a maximum value of the number of flows to be displayed on the screen via the input unit, Referring to the route information, select the number of flows up to the maximum value via the input node or link from the flows flowing through the network, and display the selected flow on the topology screen in the screen display processing section The selected flow is displayed on the ground-to-ground traffic screen, and the selected flow is displayed on the traffic information list screen.
In addition, the flow display control unit of the network visualization device of the present invention receives the change input of the maximum value of the number of flows to be displayed on the screen via the input unit, and selects the number of flows to be selected from the flows flowing through the network. The maximum value is the maximum value indicated in the change input.

In this way, the network visualization device displays a flow that meets the conditions specified by the administrator on the topology screen, the ground-to-ground traffic screen, and the traffic information list screen. This makes it easier for an administrator to visually grasp network flow information on the screen.
In this way, the network visualization device changes the maximum value of the number of flows when receiving an input for changing the maximum value of the number of flows to be displayed on the screen. Thus, the administrator can change the number of flows to be displayed on the screen to the number of flows desired by the administrator.

  The flow display control unit of the network device of the present invention accepts a change input of the maximum value of the number of flows to be displayed on the screen by clicking the flow number increase button and the flow number decrease button on the flow display control screen. The input of the setting information of the number of flows to be increased or decreased each time the flow number increase button and the flow number decrease button are clicked once is accepted via the input unit. Each time the flow number increase button on the flow display control screen is clicked once according to the input setting information, the maximum value of the number of flows to be displayed on the screen is increased and the flow number decrease button is clicked once. Each time, the maximum number of flows to be displayed on the screen is decreased.

  By doing in this way, the network visualization apparatus can set the change width of the maximum value of the number of flows to be displayed on the screen to a number desired by the administrator.

  The flow display control unit of the network device of the present invention refers to the traffic amount of the flow indicated in the traffic information and the hop count of the flow indicated in the route information when selecting the flow up to the maximum value. Thus, the number of flows up to the maximum value is selected in descending order of traffic volume or hop count of each flow.

  By doing in this way, the network visualization device can display a predetermined number of flows on the screen in order of increasing or decreasing traffic volume or hop count of each flow.

  In addition, the flow display control unit of the network device of the present invention accepts a selection input of a flow to be highlighted from among the flows displayed on any one of the topology screen, the ground-to-ground traffic screen, and the traffic information list screen. When this happens, the screen display processing unit highlights the flow on the topology screen, the ground-to-ground traffic screen, and the traffic information list screen.

  By doing in this way, the network visualization apparatus can highlight the flow selected from the flows displayed on each screen.

  When the flow display control unit of the network visualization device of the present invention receives an instruction input for rotating the viewpoint of the topology screen by 90 degrees, the flow display control unit sets a link through which the flow being displayed on the topology screen passes to the screen display processing unit. As a horizontal axis, a screen showing the traffic amount of each of the other flows flowing through the link on the vertical axis is displayed.

  In this way, the administrator can easily see what flow is flowing on the link through which the selected flow passes and how much traffic of each flow is.

  According to the present invention, it is possible to provide a network visualization means that is easy for a network administrator to visually grasp.

It is the figure which showed the screen which the network visualization apparatus used as a comparative example displays. It is the figure which showed the screen which the network visualization apparatus (visualization apparatus) of this Embodiment displays. It is the figure which showed notionally the process outline | summary of the visualization apparatus. It is the figure which showed the structure of the network management apparatus at the time of implement | achieving a visualization apparatus as a user I / F part of a network management apparatus. It is the figure which showed the data processing example by the flow display control part of a visualization apparatus. It is the figure which showed the other example of a display screen of a visualization apparatus. It is the figure which showed the other example of a display screen of a visualization apparatus.

  First, an outline of a screen displayed by the network visualization device (visualization device) according to the embodiment (the present embodiment) for carrying out the present invention will be described.

  As illustrated in FIG. 2, the screen displayed by the visualization apparatus includes a topology screen, a ground-to-ground traffic screen, and a traffic information list screen. The topology screen is a screen showing a flow that flows between the nodes on the topology of the communication network (information indicating which links are connected between the nodes). The ground-to-ground traffic screen is a screen showing the transition of the traffic amount of each flow in time series. The traffic information list screen is a screen showing a list of traffic amounts of each flow at a predetermined time. When the visualization device displays such a screen, the network administrator can determine which nodes (links) each flow flows, how much traffic each flow flows, and It is easy to visually recognize the state of the traffic volume.

  This screen also includes a flow display control panel. This flow display control panel is an area for receiving a flow condition to be displayed on each screen and an instruction input for the maximum number of flows to be displayed. The visualization apparatus selects a flow to be displayed on the screen based on an instruction input from the flow display control panel. As a result, the visualization apparatus can display a flow desired by the network administrator on the screen.

  An outline of the processing of such a visualization apparatus will be described with reference to FIG. Here, the visualization apparatus already has information for creating the screen shown in FIG. 2 (topology information 1431 of the communication network, route information 1432 of each flow, and traffic information 1433 indicating the traffic amount of each flow shown in FIG. 4). It shall be remembered.

  Whether the visualization device (1) extracts a flow that passes through all locations (nodes and links) selected on the screen, or (2) extracts a flow that passes through any location selected on the screen Is received from the flow display control panel. In addition, the visualization device accepts an input of the order in which flows are displayed on the screen (in order of traffic amount, in order of the number of hops, or in order of priority set for each flow).

  Here, when a link between the router R1 and the router R3 is selected on the screen and an input for displaying a maximum of two flows via the selected link in descending order of traffic from the flow display control panel is received. think of. In this case, for example, as shown in a screen 301, the visualization apparatus displays flows A and B that pass through the link between the router R1 and the router R3 on the topology screen.

  Here, the screen 301 is a button (display flow number increase / decrease button) that receives input of the number of flows currently displayed (for example, “2”), the total number of flows accommodated in the selection target, and the increase / decrease in the number of display flows. including. For example, when the button [-] (display flow number reduction button) is clicked, the visualization apparatus decreases the number of display flows by one and passes through the link between the router R1 and the router R3 as shown in the screen 302. Only one flow with the most traffic among the flows is displayed. On the other hand, when the button [+] (display flow number increase button) is clicked, the number of display flows is increased by one, and as shown in the screen 303, among the flows that pass through the link between the router R1 and the router R3, Three flows (flows A, B, and C) are displayed in descending order of traffic volume.

  Next, an apparatus for realizing such a visualization apparatus will be exemplified. The above-described visualization device is realized by, for example, the user interface (I / F) unit 120 of the network management device 100 of the communication network shown in FIG.

  The communication network is a network in which a plurality of nodes (IP (Internet Protocol) routers, etc.) are linked. The network management apparatus 100 performs network management processing such as collection of network information of a communication network and various setting instructions to nodes. The network management device 100 includes a function providing unit 110, a user I / F unit 120, a storage unit 140, and an input / output unit 130, and an input device for inputting instructions to the network management device 100. 200 (keyboard, mouse, etc.) and a display device 300 (liquid crystal monitor, etc.) for displaying the processing result of the network management device 100 are connected. Note that the input device 200 and the display device 300 may be realized by a touch panel.

  The user I / F unit 120 of the network management apparatus 100 stores the processing result by the function providing unit 110 in the storage unit 140. Then, based on an instruction input from the input device 200, the user I / F unit 120 displays a predetermined flow on the screen of the display device 300, or controls the number of flows to be displayed on the screen (see FIG. 3 screens 301 to 303).

  The input / output unit 130 includes an input / output interface and a communication interface. The function providing unit 110 and the user I / F unit 120 have an interface 121 with the function providing unit and a GUI unit 122, which are a program execution process by a CPU (Central Processing Unit) provided in the network management apparatus 100, a dedicated circuit, and the like. It is realized by. Furthermore, the storage unit 140 includes a storage medium such as a random access memory (RAM), a read only memory (ROM), a hard disk drive (HDD), and a flash memory. When the network management apparatus 100 is realized by program execution processing, the storage unit 140 stores a program for realizing the functions of the network management apparatus 100. In the present embodiment, the function providing unit 110 and the user I / F unit 120 will be described as the same configuration in the network management apparatus 100, but the function providing unit 110 and the user I / F unit 120 are separated from each other. It may be realized as.

  The storage unit 140 stores communication network topology information 1431, route information 1432 indicating the via link of each flow, traffic information 1433 indicating the traffic volume of each flow, and the like.

  As described above, the topology information 1431 is information indicating a connection state of each node constituting the communication network and a link connecting each node. The topology information 1431 may include the type, model, OS (Operating System), possessed I / F, operating status, configuration information (setting information), and the like of each node.

  The path information 1432 is information indicating, for each flow that flows through the network, the start and end nodes of the flow, identification information of the link through which the flow passes, and the like (see Table 1). The route information 1432 is referred to when the topology screen display processing unit 124 creates a topology screen or when the graph view processing unit 126 creates a ground-to-ground traffic screen.

  The traffic information 1433 is information indicating the traffic volume of each flow at each date and time (see Table 2). The traffic amount of each flow is calculated by the network management unit 112 based on the traffic amount of each node in I / F units, for example. This traffic information 1433 may include identification information of the start node and the end node of each flow as exemplified in Table 2. The traffic information 1433 is referred to when the list view processing unit 125 creates a traffic information list screen or when the graph view processing unit 126 creates a ground-to-ground traffic screen.

  The input / output unit 130 passes an instruction (for example, an instruction on the number of flows to be displayed) input from the input device 200 to the user I / F unit 120, or processing results of the user I / F unit 120 (illustrated in FIG. 2) A topology screen, a ground-to-ground traffic screen, etc.) are displayed on the display device 300.

  For example, the function providing unit 110 collects network information of a communication network, creates topology information 1431, route information 1432, traffic information 1433, and the like, and outputs them to the user I / F unit 120. Further, the function providing unit 110 performs network management processing such as various setting instructions to the nodes.

  The function providing unit 110 includes an interface 111 with a communication network, a network management unit 112, and an interface 113 with a user I / F unit. The network management unit 112 acquires various pieces of information from the communication network via the interface 111 with the communication network, the topology information 1431 of the communication network, the route information 1432 indicating the link through each flow, and the traffic amount of each flow Is generated and output to the user I / F unit 120 via the interface 113 with the user I / F unit.

  The user I / F unit 120 includes an interface 121 with a function providing unit and a graphical user interface (GUI) unit 122. The GUI unit 122 includes a screen display processing unit 123, a flow display control unit 127, and an input processing unit 128.

  The screen display processing unit 123 refers to the topology information 1431, the route information 1432, the traffic information 1433, and the like stored in the storage unit 140, creates a screen showing the route, traffic amount, and the like of each flow. 300 is displayed. The screen display processing unit 123 includes a topology screen display processing unit 124, a list view processing unit 125, and a graph view processing unit 126.

  The topology screen display processing unit 124 refers to the topology information 1431 and the path information 1432, and includes a topology screen (nodes constituting the communication network, links connecting the nodes, and flows flowing between the nodes). 2) is created and displayed. Further, the topology screen display processing unit 124 displays the flow instructed from the flow display control unit 127 on the topology screen. With such a topology screen, the administrator can visually recognize which node and link each flow flows through.

  The list view processing unit 125 refers to the route information 1432 and the traffic information 1433, and creates and displays a traffic information list screen (see FIG. 2) showing the traffic amount of each flow. This traffic volume may be the latest traffic volume or the traffic volume of a predetermined date and time in the past.

  The graph view processing unit 126 refers to the traffic information 1433 and creates and displays a ground-to-ground traffic screen (see FIG. 2) showing the transition of the traffic amount of each flow in time series.

  The flow display control unit 127 performs filtering (data filtering) and rearrangement (sorting) of information on each flow indicated in the traffic information 1433 according to the flow condition indicated by the instruction input via the input processing unit 128. Thereby, the flow information displayed on the screen by the screen display processing unit 123 is controlled. For example, when a selection input of a node or link and a maximum value N of the number of flows to be displayed on the screen are received, the input node or link is selected from the flows flowing through the network with reference to the route information 1432. Select a maximum of N flows through. Then, the screen display processing unit 124 displays the selected flow on the topology screen, displays the selected flow on the ground traffic screen, and displays the selected flow on the traffic information list screen.

  The input processing unit 128 outputs an instruction input via the input / output unit 130 (for example, an instruction on the maximum value of the number of flows to be displayed or information indicating the flow to be displayed) to the flow display control unit 127.

  An example of narrowing down (data filtering) and rearranging (sorting) information of each flow in the traffic information 1433 will be described with reference to FIG.

  For example, when the flow display control unit 127 accepts an A operation (operation for instructing flow filtering) via the input processing unit 128 as shown in FIG. 5, the flow display control unit 127 performs the A operation on the original data of the traffic information 1433. Filters flows that meet the input conditions.

  After that, when the flow display control unit 127 receives the B operation (operation for instructing flow rearrangement) via the input processing unit 128, the flow display control unit 127 sorts the filtered records in order of increasing or decreasing traffic volume of the flow. . The range of the subfilter after the change amount designation shown in FIG. 5 will be described later. In this way, the flow display control unit 127 performs filtering and sorting of the data of the traffic information 1433, and the screen display processing unit 123 performs screen display based on the filtered and sorted data.

  Here, the contents of the instruction input from the flow display control panel 127 by the flow display control unit 127 and an example of processing contents based on the instruction will be described.

  For example, if the condition instructed from the flow display control panel is (A1) a condition that the flow passes through all of the selected locations (nodes, links), the flow display control unit 127 determines from the route information 1432 and the traffic information 1433. , Narrow down the information of the flow that goes through all the selected locations. Also, if the instructed condition is a flow that passes through any of the selected locations (nodes, links) (A2), the flow display control unit 127 selects the selected location from the route information 1432 and the traffic information 1433. Narrow down the flow information that goes through one of them. In either case, the maximum value of the flow displayed on the screen is N. The value of N can be increased or decreased based on an instruction from the input device 200. By controlling the maximum value of the flow displayed on the screen in this way, for example, the visibility of each flow on the topology screen or the ground-to-ground traffic screen is improved.

  Furthermore, if the condition instructed from the flow display control panel is (A3) the traffic amount is the higher flow, the flow display control unit 127 uses the route information 1432 and the traffic information 1433 to determine the upper M flows of the traffic amount. The information is narrowed down and sorted in descending order of traffic volume. The value of M can be increased or decreased based on an instruction from the input device 200.

  Further, in the conditions (A1) and (A2), the sort order of the flow display control unit 127 when the number of flow displays is limited to a maximum of N is, for example, the order shown in the following (B1) to (B3). is there. Also in this order, the flow display control unit 127 is input via the input processing unit 128.

(B1) Order in which the traffic volume of the flow is large or small (B2) Order in which the number of flow hops is large or small (B3) Order in which the flow priority is high or low

  For example, if the instructed condition is (A1) the condition that (B1) N flows are displayed in descending order of the traffic volume of the flow that passes through all the selected locations (nodes, links), the flow display The control unit 127 extracts information on a flow that passes through all the selected locations (nodes and links) from the route information 1432 and the traffic information 1433. Then, with reference to the traffic amount indicated in the traffic information 1433, N flows are narrowed down in descending order of the traffic amount. In addition, the priority of this flow shall be set to the traffic information 1433, for example.

  According to such a network management apparatus 100, a flow desired by the administrator can be displayed on the screen. Therefore, it is possible to improve the visibility when the administrator confirms the flow information on the screen.

  The flow display control unit 127 has been described as an example in which the amount of change (change width) when the display flow increase / decrease button (see FIG. 3) on the flow display control panel is pressed is one. However, the present invention is not limited to this, and an arbitrary value can be set. This set value is reflected in the sub-filter range of the traffic information 1433 in FIG. For example, when the number of flows that increase or decrease when the increase / decrease button is pressed once is 2, the range of the sub-filter of the traffic information 1433 is two flows. That is, the flow display control unit 127 receives a change input of the maximum number of flows to be displayed on the screen by clicking the flow number increase button and the flow number decrease button on the flow display control screen. Then, the flow display control unit 127 receives input of setting information for the number of flows to be increased or decreased each time the flow number increase button and the flow number decrease button is clicked once, and the flow display control is performed according to the input setting information. Each time the flow number increase button on the screen is clicked once, the maximum number of flows to be displayed on the screen is increased. Each time the flow number reduction button is clicked once, the maximum value of the number of flows displayed on the screen is decreased.

  In addition, the amount of change (change width) when one increase / decrease button is pressed may be defined by the flow traffic amount or the number of hops. For example, when the flow that increases or decreases when the increase / decrease button is pressed once is 100 Mbps, the flow display control unit 127 also sets the range of the sub-filter of the traffic information 1433 to 100 Mbps. In such a setting, for example, when the increase button of the display flow is pressed once, the flow display control unit 127 displays a flow to be displayed on the topology screen among the information of each flow indicated in the traffic information 1433. Is expanded by 100 Mbps. As a specific example, when a flow up to 500 Mbps has been displayed in order from the largest traffic volume on the topology screen until now, if the increase button of the number of displayed flows is pressed once, the flow display control unit In 127, information of a flow up to 400 Mbps is displayed among the information of the flow indicated in the traffic information 1433.

  The network management apparatus 100 may highlight the flow selected by the administrator on each of the topology screen, the ground-to-ground traffic screen, and the traffic information list screen. A screen display example in this case will be described with reference to FIG.

  For example, consider a case where the flow display control unit 127 displays information on the flows A, B, and C on the topology screen and the ground-to-ground traffic screen on the screen display processing unit 123 (see FIG. 6). In this case, the list view processing unit 125 displays the flows A, B, and C on the traffic information list screen in a selected state in order to indicate that the flows A, B, and C are selected, for example. When a flow is selected on the topology screen, the ground-to-ground traffic screen, or the traffic information list screen by double-clicking the mouse of the input device 200, the selected information is flow-display controlled via the input processing unit 128. To the unit 127. Based on this selection information, the flow display control unit 127 causes the screen display processing unit 123 to highlight the selected flow on each of the topology screen, the ground-to-ground traffic screen, and the traffic information list screen. For example, when the flow A display area is selected on the topology screen, the flow A on the ground-to-ground traffic screen and the traffic information list screen is highlighted. After that, when the highlighted flow is selected again, the highlighted display may be canceled. In this way, the flows displayed on each screen are not selected, selected, and further selected from the selected state (highlighted state). The two states are easy to see on the screen.

  In this manner, the flow display control unit 127 highlights the information of the flow selected on any of the topology screen, the ground-to-ground traffic screen, and the traffic information list screen in cooperation with each other on each screen. . As a result, the flow information selected by the administrator can be easily viewed on the topology screen, the ground-to-ground traffic screen, and the traffic information list screen.

  Note that the flow display control unit 127 may display the flow in the selected state or the highlighted flow on the traffic information list screen. By doing so, it becomes easy to give subsequent instructions to the selected flow or the highlighted flow.

  Note that the sub-filtered unit illustrated in FIG. 5 is regarded as one group, and for each group, the screen display processing unit 123 displays the topological screen, the ground-to-ground traffic screen, and the traffic information list screen by distinguishing them by color coding or the like. You may make it do.

  In the above-described embodiment, the topology screen display processing unit 124 of the screen display processing unit 123 has been described as an example in which the flow flowing between the nodes on the topology screen is drawn in two dimensions. However, the present invention is not limited to this. . For example, the flow may be drawn in three dimensions on the topology screen. For example, the topology screen display processing unit 124 plots each flow on the topology screen, refers to the route information 1432 and the traffic information 1433, and flows through each link on the topology screen, as in the above-described embodiment. Information on each traffic amount and time-series fluctuation of the traffic amount is included. Then, the screen display processing unit 123 first displays a topology screen 701 as illustrated in FIG. After that, when the flow display control unit 127 receives an instruction to change the viewpoint (angle) of the topology screen 701 from the on-screen flow display control panel, the flow display control unit 127 displays a screen with the viewpoint changed according to the instruction input. When the viewpoint (angle) is 90 degrees, the flow display control unit 127 causes the screen display processing unit 123 to rotate the two-dimensional plane by 90 degrees and display a screen as shown in the screen 702. That is, with the horizontal axis representing the link through which the flow passes, the traffic amount of the target flow F1 flowing through the node R1-node R3-node R4-node R5 and the link through which the target flow passes (node R1-node R3-node R4- A screen showing the traffic amount of other flows (F2, F3, F4) via the node R5) is displayed. The traffic amount at this time is shown in the vertical axis direction on the screen. This allows the administrator to see on the screen what kind of flow is flowing on the link through which the selected flow passes, how much traffic of each flow is, and what is the link usage rate. It becomes easy to do. At this time, the flow display control unit 127 receives an input of the maximum value N of the number of flows to be displayed on the screen from the flow display control panel, and determines the number of flows to be displayed on the topology screen 701 and the screen 702 based on this. You may do it.

DESCRIPTION OF SYMBOLS 100 Network management apparatus 110 Function provision part 111 Interface with communication network 112 Network management part 113 Interface with user I / F part 120 User I / F part 121 Interface with function provision part 122 GUI part 123 Screen display processing part 124 Topology Screen display processing unit 125 List view processing unit 126 Graph view processing unit 127 Flow display control unit 128 Input processing unit 130 Input / output unit 140 Storage unit 200 Input device 300 Display device 1431 Topology information 1432 Route information 1433 Traffic information

Claims (5)

Topology information indicating the connection status of each node constituting the network and the link connecting each node, and for each flow that flows through the network, the flow passes between the start point node and the end point node of the flow and between the start point node and the end point node. Receiving an input of route information indicating identification information of a link to be performed and traffic information indicating the traffic amount of each flow, and storing the input in a storage unit;
On the display device, referring to the topology information and route information, a topology screen showing a flow flowing between the nodes on the topology of the network is displayed, and referring to the traffic information, the topology for each predetermined time is displayed. A screen display processing unit for displaying a traffic screen between the grounds indicating a transition of the traffic amount of each flow, and displaying a traffic information list screen indicating a list of the traffic amount of each flow at a predetermined time;
When receiving the selection input of the node or link and the maximum value of the number of flows to be displayed on the screen via the input unit, referring to the route information, the input from the flows flowing through the network Select the number of flows up to the maximum value via the specified node or link,
A flow for causing the screen display processing unit to display the selected flow on the topology screen, to display the selected flow on the ground-to-ground traffic screen, and to display the selected flow on the traffic information list screen. A display control unit ,
The flow display control unit
When the change input of the maximum value of the number of flows to be displayed on the screen is received via the input unit, the maximum value of the number of flows selected from the flows flowing through the network is the maximum value indicated in the change input. network visualization device characterized that you and. The flow display control unit
In the case of accepting a change input of the maximum value of the number of flows to be displayed on the screen by clicking the flow number increase button and the flow number decrease button on the flow display control screen, the flow number increase button and Accepting input of setting information for the number of flows to be increased or decreased each time the flow number decrease button is clicked once,
Each time the flow number increase button on the flow display control screen is clicked once according to the input setting information, the maximum number of flows to be displayed on the screen is increased, and the flow number decrease button is 1 time it is clicked times, network visualization apparatus according to claim 1, characterized in that reducing the maximum number of flows to be displayed on the screen. The flow display control unit
When selecting a flow up to the maximum number,
Referring to the traffic amount of the flow indicated in the traffic information and the hop count of the flow indicated in the route information, the number of traffic amounts or the number of hops of each flow up to the maximum value in order of increasing or decreasing number. network visualization device according to claim 1 or claim 2, characterized in that selecting the flow. The flow display control unit
When a selection input of a flow to be highlighted is accepted from among the flows displayed on any of the topology screen, the ground-to-ground traffic screen, and the traffic information list screen, the screen display processing unit topology screen, network visualization device according to any one of claims 1 to 3, characterized in that to highlight the flow of the ground between the traffic screen and the traffic information list on the screen. When the flow display control unit receives an instruction input to rotate the viewpoint of the topology screen by 90 degrees,
The screen display processing unit displays a screen in which a horizontal axis represents a link through which a flow being displayed on the topology screen passes, and a vertical axis represents the traffic amount of each of the other flows flowing through the link. The network visualization device according to any one of claims 1 to 4 .

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