JP2012209871A - Network visualization method and network visualization apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To represent resource shares among VNTs on a physical network, resource allocations to each VNT and network behavior of each VNT.SOLUTION: A network visualization apparatus receives L1 path information and link traffic information from a VN agent server, and receives physical network topology information and resource attribute change information from a PN management server. According to the information, the network virtualization apparatus display a VNT display screen indicating logical links and traffic of each VNT, an allocated resource display screen indicating a physical topology, allocated resources and L1 paths of each VNT, and a physical network display screen indicating a physical topology of an entire physical network and shared resources and competitive resources of each VNT. Physical links corresponding to the shared resources are highlighted on the allocated resource display screen.

Description

  The present invention relates to a visualization technique for a virtual network of a network.

  Conventionally, network virtualization has been proposed as a technique for realizing effective use of network resources. Virtualization refers to accommodating a plurality of logical virtual networks (VNT, Virtual Network Topology) on a physical infrastructure network (physical network). This VNT is assigned for each service such as a voice service, a video service, and the like. In this virtualization, while performing optimal control autonomously for individual VNTs using VNT control technology (see Non-Patent Document 1), resource utilization of the entire physical network is achieved using distributed resource (resource) control technology for each VNT. To improve efficiency. Here, the distribution resource control refers to control of the bandwidth allocated to the physical links constituting each VNT.

Y.Koizumi, T.Miyamura, S.Arakawa, E.Oki, K.Shiomoto, and M.Murata, "Robust Virtual Network Topology Control based on Attractor Selection", ONDM 2009

  Here, each VNT is controlled with a temporal variation by a plurality of algorithms such as dynamic allocation resource control and VNT optimization control. For this reason, it is difficult to grasp the behavior of each VNT network. Specifically, in the physical network, the shared state of resources (resources) among a plurality of VNTs, the resource allocation status to each VNT, the behavior of each VNT network (what L1 (layer 1) path is set) It is difficult to understand. In particular, it is assumed that the maximum number of VNTs is about 1000. However, management of such a large number of VNTs has not been studied so far. Therefore, the present invention aims to solve the above-described problems and provide a means for grasping the resource sharing state between VNTs in a physical network, the resource allocation status to each VNT, and the behavior of each VNT network. And

  In order to solve the above-described problems, the present invention provides a network visualization device that displays VNT (Virtual Network Topology) information accommodated in a physical network on a screen, and performs VNT control using a predetermined VNT algorithm. From the Virtual Network agent server, L1 path information indicating the L1 (layer 1) path of the VNT and link traffic information indicating the amount of link traffic flowing through the logical link for each logical link of the VNT are received. In addition, this network visualization device includes a connection state between an IP router and a transmission device, which are nodes in the physical network, a physical link that connects the nodes, from a PN (Photonic Network) management device that acquires and controls physical network information, The physical network topology information indicating the allocated bandwidth of each physical link, the physical topology of each VNT, and the allocated bandwidth of the VNT to the physical link is received. Then, the network visualization device stores the received L1 path information, link traffic information, and physical network topology information in the storage unit. Thereafter, the network visualization device refers to the physical network topology information and displays a physical network display screen that displays the physical topology of the physical network and the identification information of the VNT that uses the physical link for each physical link in the physical topology. indicate. Further, referring to the resource topology information indicating the physical topology of each VNT in the physical network topology information and the bandwidth allocated to the physical link of the VNT, the L1 path information, and the link traffic information, the VNT is determined for each VNT. A VNT display screen that displays the logical link to be configured, the IP router through which the logical link passes, and the amount of link traffic flowing through the logical link is displayed. Further, with reference to the resource attribute information and the L1 path information, a distribution resource display screen showing the physical topology of the VNT, the L1 path of the VNT, and the bandwidth allocated to the physical link of the VNT is displayed for each VNT. To do. Then, the network visualization device actually refers to the L1 path information, the link traffic information, and the resource attribute information to actually allocate the allocated bandwidth (traffic amount) of the L1 path constituting the logical link among the logical links. When there is a logical link in which the ratio of the traffic volume that is flowing exceeds a predetermined threshold, an alarm is displayed for the logical link on the VNT display screen. In addition, when the network visualization device receives an input of selection of a logical link on the VNT display screen from the input unit, the network visualization device refers to the resource attribute information and the L1 path information, and selects the selected logical on the allocated resource display screen. The physical link used by the link is identified and displayed.

  By doing so, the network administrator can share the VNT resources (resources) in the physical network, the resource allocation status to each VNT, the network behavior of each VNT (what L1 (layer 1) You can see if the path is set. In addition, it is possible to grasp which physical link is used in the physical network by the logical link constituting the VNT.

  Further, the present invention provides a physical display screen when the network visualization device refers to the L1 path information and the physical network topology information and has a physical link in which the number of VNTs using the physical link exceeds a predetermined threshold. Above, the physical link is identified and displayed.

  By doing in this way, the network administrator can grasp the links used by the VNT exceeding a predetermined number among the links of the physical network, that is, the links in which the resources are in a competition state.

  Further, according to the present invention, when the network visualization device receives selection input of the VNT to be displayed via the input unit, the network visualization device is selected with reference to the resource attribute information, the L1 path information, and the link traffic information. A VNT display screen showing the logical link indicating the L1 path constituting the VNT, the IP router via the logical link, and the amount of link traffic flowing through the logical link is displayed. Further, the network visualization device refers to the resource attribute information and the L1 path information, and assigns the physical topology of the VNT, the L1 path of the VNT, and the physical link of the VNT to each selected VNT. An allocation resource display screen showing the bandwidth is displayed.

  By doing in this way, the network visualization apparatus can narrow down the information regarding VNT displayed on a screen. Therefore, it is possible to improve the visibility on each screen and reduce the load of display processing on each screen in the network visualization device.

  Further, in the present invention, the L1 path information is L1 path information of one or more patterns related to the same VNT output by the VNT algorithm, and the network visualization device further transmits the VNT to be displayed via the input unit. When the selection input of the L1 path information pattern is received, the following processing is performed. That is, the network visualization device refers to the resource attribute information, the L1 path information, and the link traffic information, and for the selected VNT, the logical link indicating the L1 path indicated in the L1 path information of the selected pattern The VNT display screen showing the IP router via the logical link and the amount of link traffic flowing through the logical link is displayed. The network visualization device refers to the resource attribute information, the L1 path information, and the link traffic information, and selects the physical topology of the selected VNT, the L1 path of the selected pattern of the VNT, and the VNT An allocation resource display screen showing the bandwidth allocated to each physical link is displayed.

  By doing so, the network visualization device can display information on the L1 path of the pattern on the screen even when a plurality of patterns of L1 paths are output by the VNT algorithm.

  In the present invention, each of the L1 path information, the link traffic information, and the physical network topology information further includes information creation date / time information, and the network visualization device refers to the information creation date / time information to obtain the VNT. The display screen and the allocated resource display screen are displayed in chronological order.

  By doing in this way, the network visualization device can display the VNT display screen and the allocated resource display screen in time series.

  In addition, according to the present invention, an abstract node in which a plurality of nodes are collected instead of a plurality of nodes on the screen of the physical network display screen, the VNT display screen, and the allocated resource display screen is displayed by the network visualization device. Display the screen shown. When the network visualization device accepts an abstract node selection input from any of the physical network display screen, the VNT display screen, and the allocated resource display screen via the input unit, the network visualization device refers to the physical network topology information. A screen showing a plurality of nodes corresponding to the abstract nodes is displayed.

  In this way, even when a large number of nodes are included in the physical network or VNT, the visibility on each screen can be improved. In addition, it is possible to reduce the load of display processing on each screen in the network visualization device.

  Further, according to the present invention, the network visualization device replaces a plurality of physical links or logical links connecting the abstract nodes on at least one of the physical network display screen, the VNT display screen, and the allocated resource display screen. A screen showing an abstract link in which the plurality of physical links or logical links are collected is displayed. When the network visualization device accepts an abstract link selection input from any of the physical network display screen, the VNT display screen, and the allocated resource display screen via the input unit, the network visualization device refers to the physical network topology information. A screen showing a plurality of physical links or logical links corresponding to the abstract links is displayed.

  By doing so, visibility on each screen can be improved even when a large number of links are included in the physical network or VNT. In addition, it is possible to reduce the load of display processing on each screen in the network visualization device.

  Further, according to the present invention, the network visualization device receives the difference information from the L1 path information previously received for the same VNT from the VN agent server. When the network visualization device displays the VNT display screen and the allocated resource display screen, the screen display is performed by reflecting the received difference information on the L1 path information stored in the storage unit.

  By doing so, it is possible to reduce the communication load with the VN agent server when the network visualization device receives the L1 path information.

  According to the present invention, it becomes easy for a network administrator to grasp a resource sharing state between VNTs in a physical network, a resource allocation state to each VNT, a network behavior of each VNT, and the like.

It is a figure which shows the structural example of the system of this Embodiment. It is a figure which shows the example of a display screen of the network visualization apparatus of FIG. It is a figure explaining the VNT display screen and allocation resource display screen of FIG. It is a figure which shows the variation of the display screen of this Embodiment. It is a figure which shows the example of a reception screen of filtering of the information displayed on the display screen of this Embodiment. It is a figure which shows the example of a reception screen of filtering of the information displayed on the display screen of this Embodiment. It is a figure which shows the example of a display by the abstraction of the node and link in the display screen of this Embodiment. It is a figure which illustrates notionally the process in case the network visualization apparatus of FIG. 1 receives the difference information of L1 path information from a VN agent server.

<Overview>
Hereinafter, embodiments of the present invention (hereinafter referred to as embodiments) will be described. As shown in FIG. 1, the system includes a physical (physical infrastructure) network, an NMS (Network Management System) 50, a VN (Virtual Network Topology) agent server 30 that performs VNT (Virtual Network Topology) control, and information acquisition and control of the physical network. A PN (Photonic Network) management server 40, a network visualization device 10, and a display device 20 are provided. In the following description, a resource indicates a link connecting between nodes of a physical network and an allocated bandwidth (usable bandwidth) to the link.

  A physical network is composed of a plurality of nodes (for example, transmission devices such as optical cross-connects, IP (Internet Protocol) routers) and links (for example, optical fibers) that connect the nodes. Of VNTs are accommodated. Here, the network visualization device 10 receives the L1 (layer 1) path information 132 and the link traffic information 131 (details will be described later) of each L1 path set in each VNT via the VN agent server 30. Also, via the PN management server 40, the connection status of the nodes in the physical network, the links connecting the nodes, the allocated bandwidth of each link, and the resource attributes (the physical topology of each VNT and the allocated bandwidth to each VNT link) are received. To do. When the resource attribute of each VNT is changed, the resource attribute change information is received from the PN management server 40. Then, the network visualization device 10 displays a screen as illustrated in FIG. 2 on the display device 20 based on these pieces of information.

  As illustrated in FIG. 2, the screen includes a physical network display screen, an allocation resource display screen, a VNT display screen, and a VNT selection screen. The physical network display screen is a screen that displays a connection state of each node and a link (physical link) connecting each node in the physical network of FIG. On this physical network display screen, the shared information of the physical resources of each VNT is also displayed. The shared information is, for example, information indicating, for each physical link, a VNT that uses the physical link and an allocated bandwidth (usable bandwidth) to each VNT. With this shared information, it is possible to confirm how much bandwidth is allocated to which VNT for the physical link. In addition, on this physical network display screen, a conflicting resource (link in which the number of assigned VNTs exceeds the threshold) is displayed as an alarm. By doing so, the network administrator can check the links used by the number of VNTs exceeding the threshold among the links of the physical network.

  The allocation resource display screen is a screen that displays, for each VNT, the allocation resources of the VNT (the physical topology of the VNT and the bandwidth allocated to the link of the VNT) and the L1 path. According to such a screen, the network administrator can confirm the allocation resources and the L1 path of each VNT.

  The VNT display screen is a screen that displays, for each VNT, logical links and IP routers that constitute the VNT. The VNT display screen also displays the amount of traffic flowing through the logical link (details will be described later with reference to FIG. 3). Further, among the logical links displayed on the VNT display screen, the link usage rate (the ratio of the traffic amount actually flowing to the allocated bandwidth (traffic amount) of the L1 path constituting the logical link) is a predetermined threshold value. If there is a logical link exceeding the limit, an alarm is displayed on this VNT display screen. The logical link on this VNT display screen corresponds to the L1 path of the physical layer. That is, the L1 path displayed on the allocated resource display screen matches the logical link on the VNT display screen. Further, a fixed value such as 1 Gbps per L1 path is given to the allocated bandwidth of each L1 path, and the value of this allocated bandwidth is stored in the physical network topology information 133.

  The VNT selection screen is a screen that accepts a VNT selection input to be displayed on the VNT display screen or the allocation resource display screen. For example, when VNT1 and VNT2 are selected on this screen, the network visualization device 10 displays information on the selected VNT on the VNT display screen and the allocated resource display screen. As a result, the network visualization device can narrow down the VNT information desired by the administrator or the like from a large number of VNTs and display the information on the screen of the display device 20.

<Configuration>
Returning to FIG. 1, the configuration of the system will be described in detail. The system includes an NMS 50, a VN agent server 30, a PN management server 40, and a network visualization device 10.

  The NMS 50 acquires link traffic (amount of traffic flowing through each link) from the physical network.

  The VN agent server 30 uses a VNT control algorithm (for example, a fluctuation algorithm 31) based on the allocation resources to each VNT received from the network visualization device 10 and the link traffic information (link traffic information 131) read from the NMS 50. To perform VNT control (setting of L1 path, etc.) of each VNT. Then, the VN agent server 30 transmits the L1 path information 132 that is the VNT control result and the link traffic information 131 to the network visualization device 10. The network visualization device 10 stores the L1 path information 132 and the link traffic information 131 transmitted here in the storage unit 13.

  The PN management server 40 includes an information acquisition unit 42 and a dynamic resource control unit 41. When the resource attribute of each VNT is changed, the result is transmitted to the network visualization device 10 as resource attribute change information. The information acquisition unit 42 acquires the physical topology (node connection state in the physical network, link connecting the nodes), and transmits physical network topology information 133 including the physical network topology to the network visualization device 10. Further, the resource attribute information determined by the dynamic resource control unit 41 is also transmitted. Furthermore, when the dynamic resource control unit 41 receives the physical network topology information 133, the resource attribute information, the L1 path information 132, and the link traffic information 131 from the network visualization device 10, the dynamic resource control unit 41 determines the bandwidth to be allocated to each VNT based on these information. Take control. When the resource attribute of each VNT is changed as a result of the control, the information acquisition unit 42 transmits resource attribute change information indicating the change result to the network visualization device 10. The network visualization device 10 stores the physical network topology information 133 and the resource attribute change information transmitted here in the storage unit 13.

  Next, the network visualization device 10 will be described. The network visualization device 10 uses the L1 path information 132, the link traffic information 131, and the physical network topology information 133 to display on the display device 20 a physical network display screen, an allocation resource display screen, a VNT display screen, and a VNT selection screen (see FIG. 2). ) Is displayed. The physical network topology information 133 is information indicating the connection state of the nodes in the physical network, the physical links connecting the nodes, and the bandwidth allocated to each physical link, and includes resource attribute information of each VNT. The L1 path information 132 is information that exists for each service network (VNT configuring the service network) and indicates a node through the L1 path in the service network. The start / end point information of the L1 path information 132 corresponds to the VNT logical link information. The link traffic information 131 is information indicating the amount of traffic flowing on the logical link for each logical link.

  The network visualization device 10 is a computer that includes an input / output interface unit (input unit and output unit) 11, a processing unit 12, a storage unit 13, and a communication interface unit (interface unit) 14. The input / output interface unit 11 is an input / output interface with a display device 20 such as a liquid crystal monitor and an input device (not shown) such as a keyboard. The processing unit 12 refers to each piece of information in the storage unit 13 and displays a screen on the display device 20. The processing unit 12 is realized by a program execution process by a CPU (Central Processing Unit) included in the network visualization device 10, a dedicated circuit, or the like. The storage unit 13 stores information (link traffic information 131, L1 path information 132, and physical network topology information 133) that is referred to when the screen is displayed on the display device 20. The storage unit 13 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 visualization device 10 is realized by program execution processing, the storage unit 13 stores a program for realizing the functions of the network visualization device 10. The communication interface unit 14 is an interface for receiving L1 path information 132 and link traffic information 131 from the VN agent server 30 and receiving resource attribute change information from the PN management server 40. The communication interface unit 14 is realized by a communication interface capable of communicating with an external device via a network such as an IP network.

  The processing unit 12 includes a screen display processing unit 121 and an information update unit 122. The screen display processing unit 121 refers to the link traffic information 131, the L1 path information 132, and the physical network topology information 133 in the storage unit 13, and the physical network display screen, the allocated resource display screen, the VNT display screen, and the VNT selection described above. A screen (see FIG. 2) is displayed on the display device 20.

<Physical network display screen>
The physical network display screen is a screen showing a connection state of each node (IP router, transmission device) in the physical network and a physical link connecting each node. The screen display processing unit 121 refers to the physical network topology information 133 and displays this physical network display screen. Further, the screen display processing unit 121 refers to the resource attribute information in the physical network topology information 133 and displays physical resource sharing information between the VNTs on the physical network display screen. Here, it is assumed that the physical link that is the display target of the shared information is selected by an input device (not shown) connected to the network visualization device 10, for example. Further, as this shared information, the bandwidth allocated to each VNT for the physical link may also be displayed. For example, the link 201 on the physical network display screen of FIG. 2 is used by the “S1, S2” VNT, and the allocated bandwidth of each VNT is “1 G (bps)”. Further, on this physical network display screen, the physical link selected as the display target of the shared resource may be highlighted on the distributed resource display screen. By doing in this way, the network administrator etc. can confirm which physical link the shared resource is in the physical topology of each VNT.

  In addition, the screen display processing unit 121 displays an alarm on a competing resource (physical link whose VNT allocation number exceeds the threshold) on the physical network display screen. For example, the link 202 on the physical network display screen of FIG. 2 is a competing resource used by the “S1, S2, S3, S4” VNT, and the bandwidth allocated to each VNT is “1G, 1G, 1G, 8G ". By doing so, the network administrator can confirm the physical links used by the number of VNTs exceeding the threshold and the allocated bandwidth (usable bandwidth) of the physical links.

<Allocated resource display screen>
The allocation resource display screen (see FIG. 3) displays, for each VNT, the physical topology of the VNT, the allocation resource (allocated bandwidth to each link), and the L1 path. For example, on the distribution resource display screen shown in FIG. 3, the IP routers 1, 2, 3, 4 and the transmission apparatus, which are nodes constituting the VNT, and a link (physical link) connecting these nodes, The bandwidth allocated to each link and the L1 path are displayed. The screen display processing unit 121 in FIG. 1 displays the allocated resource display screen with reference to the resource attribute information and the L1 path information 132 of the physical network topology information 133.

<VNT display screen>
The VNT display screen (see FIG. 3) is a screen that shows the logical link that constitutes the VNT and the amount of link traffic that flows through the IP router and the logical link for each VNT. The screen display processing unit 121 in FIG. 1 displays the VNT display screen with reference to the resource attribute information, the L1 path information 132, and the link traffic information 131 of the physical network topology information 133. On the VNT display screen shown in FIG. 3, the IP routers 1 to 4, the logical link of the IP router 2 -IP router 1 and the traffic amount “0.8 G” of the logical link, and the IP router 1 -IP router 3 The logical link and the traffic amount “0.5 G” of the logical link, and the logical link of the IP router 3 -IP router 4 and the traffic amount “1 G” of the logical link are displayed. As shown in FIG. 3, on the VNT display screen, the L1 path set in the physical layer is displayed as a logical link connecting the IP routers. That is, since the VNT display screen is an IP layer topology, the display of the transmission apparatus passing between the IP routers and the route information of the L1 path are omitted. Further, when a logical link on the VNT display screen is selected, the screen display processing unit 121 highlights the L1 path corresponding to this logical link on the allocated resource display screen. By doing in this way, the network administrator can confirm which link (and node) the logical link displayed on the VNT display screen uses in the physical network.

<VNT selection screen>
The VNT selection screen (see FIG. 2) is a screen showing a list of VNTs to be displayed on the VNT display screen and the allocated resource display screen. The screen display processing unit 121 in FIG. 1 refers to the resource attribute information of the physical network topology information 133 and displays this VNT selection screen. Then, the screen display processing unit 121 displays information on the VNT selected from the VNT selection screen on the VNT display screen and the allocated resource display screen.

  Further, the information update unit 122 updates the link traffic information 131, the L1 path information 132, and the physical network topology information 133 in the storage unit 13 based on information received from the VN agent server 30 and the PN management server 40. For example, when the information updating unit 122 receives the L1 path information 132 and the link traffic information 131 from the VN agent server 30 via the communication interface unit 14, based on these information, the L1 path in the storage unit 13 of the network visualization device 10. Information 132 and link traffic information 131 are updated. Further, when receiving the resource attribute change information from the PN management server 40, the information updating unit 122 updates the resource attribute information of the physical network topology information 133 based on this information.

  The storage unit 13 stores the link traffic information 131, the L1 path information 132, and the physical network topology information 133 described above. Since these pieces of information are as described above, description thereof is omitted.

  The communication interface unit 14 transmits the allocation resources (physical topology and allocated bandwidth) to each VNT to the VN agent server 30 and receives the L1 path information 132 and the link traffic information 131 from the VN agent server 30 as a response. To do. Further, the communication interface unit 14 transmits physical network topology information 133, resource attribute information, L1 path information 132, and link traffic information 131, and the communication interface unit 14 receives resource attribute change information from the PN management server 40. .

  According to the network visualization device 10 described above, the sharing status of each VNT in the physical network, the resource allocation status to each VNT, the network behavior of each VNT (what L1 (layer 1) path is set) Is displayed on the screen of the display device 20, the network administrator can easily grasp the status of each VNT.

<Filtering>
In the above-described embodiment, the screen display processing unit 121 displays information on a plurality of VNTs as shown in FIG. 4A on the VNT display screen and the allocated resource display screen. However, the present invention is not limited to this. . For example, as shown in FIG. 4B, for a single VNT, the VNT display screen and the allocated resource display screen are arranged in time series, and the physical topology of the VNT, the allocated bandwidth, the L1 path, and the traffic volume of the L1 path are You may make it display how it was changed in the series. In this case, in the network visualization device 10, the L1 path information 132, the link traffic information 131, and the resource attribute change information are accumulated in the storage unit 13 together with date / time information (information creation date / time or reception date / time). Then, the screen display processing unit 121 creates a VNT display screen and an allocation resource display screen for each date and time based on the date and time information of these information, and displays them in time series. In this case, information on one VNT or information on a plurality of VNTs may be displayed on the screen.

  Furthermore, the network visualization device 10 may receive a plurality of patterns of L1 path information 132 and link traffic information 131 for the same VNT from the VN agent server 30. In such a case, the screen display processing unit 121 of the network visualization apparatus 10 may display the received multiple patterns of L1 path information 132 and link traffic information 131 on the VNT display screen and the allocated resource display screen (FIG. 4). (See “Display of multiple behaviors of a single VNT” shown in (c)).

  Such an instruction regarding filtering processing may be input from a VNT selection screen as shown in FIG. 5, for example. FIG. 5A shows an initial state of the VNT selection screen. In the initial state, this VNT selection screen has a check box for accepting selection input of identification information of a VNT to be displayed, and selection input of which pattern L1 path information 132 and link traffic information 131 are to be displayed for that VNT. And a check box that accepts. In addition, this VNT selection screen may also accept a switching input as to which selection input relating to information of the VNT group is accepted at which point. For example, as shown in FIG. 5A, time-series information switching may be received by a tab indicating a date and time such as “T = 0, 1,..., N”.

  Further, as illustrated in FIG. 5B, the screen display processing unit 121, when the check is made on the top item among the check boxes of each VNT as illustrated in FIG. 5B, displays that VNT ID = 0. It is also possible to automatically check the check box of ID = 0 on the screen.

  Furthermore, the screen display processing unit 121 sets the check boxes of the pattern IDs of the L1 path information 132 and link traffic information 131 of each VNT as information of a lower hierarchy than the identification information of the VNT, and exemplarily illustrated in FIG. As described above, the information of the check box hierarchy of this ID may not be displayed on the screen (closed).

  Further, the screen display processing unit 121 registers some patterns as templates for the input contents of the VNT selection screen. Then, when a template is selected and input on the VNT selection screen, the screen display processing unit 121 may perform automatic input according to the registered content in the selected template. For example, when the template button A is selected as shown in FIG. 6A, the screen display processing unit 121 calls a plurality of VNT templates. Then, the screen display processing unit 121 automatically selects check boxes for displaying the L1 path information 132 and the link traffic information 131 with ID = 0 of a plurality of VNTs (for example, VNT1 to VNT3).

  Further, as shown in FIG. 6B, when the template button B is selected, the screen display processing unit 121 calls a time-series template and automatically selects a tab with a date and time in a predetermined range for a certain VNT (for example, VNT1). Select with. Further, as shown in FIG. 6C, when the template button C is selected, the screen display processing unit 121 calls a plurality of behavior templates of a single VNT and sets a predetermined number of patterns for a certain VNT (for example, VNT1). The L1 path information 132 and the link traffic information 131 are automatically selected.

  Information registration in each template may be manually input by a network administrator or the like via an input device, or may be performed with a preset default value. When inputting manually, for example, in the case of registration in a plurality of VNT templates shown in FIG. 6A, a VNT display range (for example, VNT1 to VNT3) is designated and a button is clicked. Further, in the case of registration in a plurality of VNT templates shown in FIG. 6B, the VNT identification information and the time-series display range are designated and the button is clicked. Further, if the registration is made to the multiple behavior templates of a single VNT shown in FIG. 6C, the VNT identification information and the display range of the candidate VNT (that is, the maximum number of patterns of the L1 path information 132 and the link for the VNT). Specify whether to display traffic information 131) and click the button. The screen display processing unit 121 accepts an input of information registration to the template through such an operation.

  As described above, the filtering of contents displayed on the screen by the screen display processing unit 121 is registered in advance as a template, so that the network administrator or the like can perform screen display of desired contents with a simple operation. .

<Node and link abstraction>
Furthermore, as illustrated in FIG. 7A, the screen display processing unit 121 of the network visualization device 10 clusters a plurality of node groups in a predetermined unit, and displays the one cluster as one abstract node. You may make it like (refer the cluster 1-cluster 3 of Fig.7 (a)). The unit of clustering here may be, for example, a node group of the same domain, or may be a node group of the same level if the nodes of the physical network have a hierarchical configuration. By doing in this way, even when the number of nodes constituting the physical network is enormous, the visibility when displayed on the display device 20 on the screen can be improved. Note that the size of the abstract node displayed on the screen may be increased according to the number of nodes grouped in the abstract node. By doing so, it becomes easy for a network administrator or the like to intuitively grasp how many nodes are abstracted for each abstract node. In addition, the processing load when the screen display processing unit 121 performs display processing on each screen can be reduced. When a selection input is received from the screen for the abstract node (for example, cluster 2) via the input / output interface unit 11, the screen display processing unit 121 refers to the physical network topology information 133 and extracts the abstract node. A plurality of node groups corresponding to the nodes may be displayed on the screen. By doing in this way, the network administrator can confirm the node group which comprises an abstract node.

  Such abstraction may also be executed for a physical link (or a logical link (L1 path) on a VNT display screen) that connects abstract nodes. At this time, for each abstract link, the thickness of the abstract link displayed on the screen may be changed (see FIG. 7B) or the color may be changed in accordance with the number of links collected. By doing so, it becomes easy for a network administrator or the like to intuitively understand how many links are abstracted for each abstract link.

<Screen display using difference information>
Further, the network visualization device 10 may receive difference information from the VN agent server 30 with respect to the L1 path information 132 stored in the storage unit 13. In this case, the L1 path information 132 stored in the storage unit 13 and the L1 path information 132 as the L1 path information 132 to be referred to when the screen display processing unit 121 displays the VNT display screen and the allocated resource display screen. Difference information is used. For example, as illustrated in FIG. 8, the network visualization device 10 receives all the information of the L1 path information 132 at the time T = 0 for the VNT1, and then receives the T1 information about the L1 path 132 at the time T = 1. Difference information from the L1 path information 132 at the time of = 0 is received. When the screen display processing unit 121 draws the L1 path on the VNT display screen and the allocation resource display screen, the T = 1 difference information is reflected in the T = 0 information (L1 path information 132). Draw a VNT. That is, when displaying the L1 path at the time T = i + 1 on the VNT display screen and the allocated resource display screen, the screen display processing unit 121 displays the difference information from T = i in the L1 path information 132 at the time T = i. Reflect. In this way, the communication load when the network visualization device 10 receives the L1 path information 132 from the VN agent server 30 can be reduced. Such a method is particularly effective when the L1 path of each VNT does not change much.

  Note that not only the L1 path information 132 but also the physical network topology information 133 is received from the PN management server 40, and the physical network display screen and the allocated resource display screen are displayed using this difference information. Also good. At this time, the storage unit 13 does not hold the memory objects of the nodes and links of the physical network at T = i and T = i + 1 independently. = Reference (address) information of the object of i is used. By doing in this way, the memory information amount of the memory | storage part 13 of the network visualization apparatus 10 can be reduced. Such a method is particularly effective when displaying a time-series screen on a large-scale physical network.

DESCRIPTION OF SYMBOLS 10 Network visualization apparatus 11 Input / output interface part 12 Processing part 13 Storage part 14 Communication interface part 20 Display apparatus 30 VN agent server 31 Fluctuation algorithm 40 PN management server 41 Dynamic resource control part 42 Information acquisition part 50 NMS
121 Screen display processing unit 122 Information update unit 131 Link traffic information 132 L1 path information 133 Physical network topology information

Claims (9)

A network visualization device that displays VNT (Virtual Network Topology) information contained in the physical network on the screen,
From the VN (Virtual Network) agent server that controls the VNT by a predetermined VNT algorithm, L1 path information indicating the L1 (layer 1) path of the VNT and a link that flows through the logical link for each logical link of the VNT Receiving link traffic information indicating traffic volume;
From a PN (Photonic Network) management apparatus that performs information acquisition and control of the physical network, a connection state of the IP router and a transmission apparatus that are nodes in the physical network, a physical link that connects the nodes, and a physical link, respectively Receiving physical network topology information indicating the allocated bandwidth of the VNT, the physical topology of each VNT, and the allocated bandwidth of the VNT to the physical link;
Storing the received L1 path information, link traffic information and physical network topology information in a storage unit;
Referring to the physical network topology information, displaying a physical network display screen for displaying the physical topology of the physical network and the identification information of the VNT using the physical link for each physical link in the physical topology; ,
For each VNT, referring to resource attribute information indicating the physical topology of each VNT in the physical network topology information and the bandwidth allocated to the physical link of the VNT, the L1 path information, and the link traffic information, Displaying a VNT display screen for displaying a logical link constituting the VNT, an IP router via the logical link, and a link traffic amount flowing through the logical link;
With reference to the resource attribute information and the L1 path information, for each VNT, an allocation resource display screen showing the physical topology of the VNT, the L1 path of the VNT, and the bandwidth allocated to the physical link of the VNT A step of displaying
Referring to the L1 path information, the link traffic information, and the resource attribute information, the ratio of the traffic volume actually flowing to the allocated bandwidth of the L1 path that constitutes the logical link of the logical links. Displaying a logical link alarm on the VNT display screen when there is a logical link exceeding a predetermined threshold;
When the input unit accepts the selection input of the logical link of the VNT display screen, the resource attribute information and the L1 path information are referred to, and the selected logical link of the selected logical link is displayed on the allocation resource display screen. And a step of identifying and displaying a physical link to be used. The network visualization device comprises:
Referring to the L1 path information and the physical network topology information, when there is a physical link in which the number of VNTs using the physical link exceeds a predetermined threshold, the physical link is identified on the physical display screen The network visualization method according to claim 1, wherein the network visualization method is displayed. The network visualization device comprises:
Via the input unit,
When the selection input of the VNT to be displayed is accepted,
Referring to the resource attribute information, the L1 path information, and the link traffic information, a logical link that constitutes the selected VNT, an IP router that passes through the logical link, and a link that flows through the logical link Display the VNT display screen displaying the traffic volume,
Referring to the resource attribute information and the L1 path information, for each selected VNT, the physical topology of the VNT, the L1 path of the VNT, and the bandwidth allocated to the physical link of the VNT are indicated. The network visualization method according to claim 1, wherein the distribution resource display screen is displayed. The L1 path information is
L1 path information of one or more patterns related to the same VNT output by the VNT algorithm,
The network visualization device comprises:
When a selection input of the pattern of the L1 path information of the VNT to be displayed is further received via the input unit,
With reference to the resource attribute information, the L1 path information, and the link traffic information, for the selected VNT, a logical link indicating an L1 path indicated in the L1 path information of the selected pattern, and Displaying the VNT display screen showing the IP router via the logical link and the amount of link traffic flowing through the logical link;
With reference to the resource attribute information, the L1 path information, and the link traffic information, the physical topology of the selected VNT, the L1 path of the selected pattern of the VNT, and the physical link of the VNT The network visualization method according to claim 3, wherein the allocated resource display screen showing each allocated bandwidth is displayed. Each of the L1 path information, the link traffic information, and the physical network topology information further includes information creation date information,
The network visualization device comprises:
The network visualization method according to claim 3, wherein the VNT display screen and the allocated resource display screen are displayed in time series with reference to the information creation date and time information. The network visualization device comprises:
On at least one of the physical network display screen, the VNT display screen, and the allocated resource display screen, instead of the plurality of nodes, a screen showing an abstract node that combines the plurality of nodes is displayed.
When the selection input of the abstract node is received from any one of the physical network display screen, the VNT display screen, and the allocated resource display screen via the input unit,
6. The network visualization method according to claim 1, wherein a screen showing a plurality of the nodes corresponding to the abstract nodes is displayed with reference to the physical network topology information. The network visualization device comprises:
Instead of a plurality of physical links or logical links connecting the abstract nodes on at least one of the physical network display screen, the VNT display screen, and the allocated resource display screen, the plurality of physical links or logical links Display a screen showing abstract links that summarize the links,
When receiving the selection input of the abstract link from any one of the physical network display screen, the VNT display screen, and the allocated resource display screen via the input unit,
The network visualization method according to claim 6, wherein a screen showing a plurality of physical links or logical links corresponding to the abstract link is displayed with reference to the physical network topology information. The network visualization device comprises:
From the VN agent server, the difference information with the L1 path information received last time for the same VNT is received,
The screen display is performed by reflecting the received difference information in the L1 path information stored in the storage unit when displaying the VNT display screen and the allocated resource display screen. Item 8. The network visualization method according to any one of items 7 to 9. A network visualization device that displays VNT (Virtual Network Topology) information contained in a physical network on a screen,
From the VN (Virtual Network) agent server that controls the VNT by a predetermined VNT algorithm, L1 path information indicating the L1 (layer 1) path of the VNT and a link that flows through the logical link for each logical link of the VNT Link traffic information indicating traffic volume, and from a PN (Photonic Network) management device that acquires and controls information on the physical network, a connection state of the IP router and transmission device, which are nodes in the physical network, An interface unit that receives physical network topology information indicating physical links connecting nodes, allocated bandwidths of the physical links, physical topologies of the VNTs, and allocated bandwidths of the VNTs to physical links;
A storage unit for storing the received L1 path information, link traffic information, and physical network topology information;
With reference to the physical network topology information, a physical network display screen for displaying the physical topology of the physical network and the identification information of the VNT using the physical link for each physical link in the physical topology is displayed.
For each VNT, referring to resource attribute information indicating the physical topology of each VNT in the physical network topology information and the bandwidth allocated to the physical link of the VNT, the L1 path information, and the link traffic information, A VNT display screen that displays the logical link that constitutes the VNT, the IP router that passes through the logical link, and the amount of link traffic that flows through the logical link;
With reference to the resource attribute information and the L1 path information, for each VNT, an allocation resource display screen showing the physical topology of the VNT, the L1 path of the VNT, and the bandwidth allocated to the physical link of the VNT And a screen display processing unit for displaying
The screen display processing unit
Referring to the L1 path information, the link traffic information, and the resource attribute information, the ratio of the traffic volume actually flowing to the allocated bandwidth of the L1 path that constitutes the logical link of the logical links. When there is a logical link exceeding a predetermined threshold, an alarm display of the logical link is performed on the VNT display screen,
When the input unit accepts the selection input of the logical link of the VNT display screen, the resource attribute information and the L1 path information are referred to, and the selected logical link of the selected logical link is displayed on the allocation resource display screen. A network visualization device for identifying and displaying a physical link to be used.

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