JP5962375B2 - Network management system and impact determination method - Google Patents

Description

  The present invention relates to a network management system and an influence determination method.

  In monitoring various devices forming an IT (Information Technology) system, for example, a network management that monitors L2 (Layer 2) switches such as routers in an IP (Internet Protocol) network and L3 (Layer 3) switches as monitoring target devices The system is in place.

  The network management system manages a network configuration such as a connection relationship between the monitoring target devices and monitors a failure of each monitoring target device. Furthermore, the network management system generally has a function of managing work plans such as inspections and construction of network devices to be implemented in the future. This work management function has a function of extracting in advance communication equipment to be constructed and a communication service that is suspended due to the construction implementation date, that is, end-to-end communication between terminals.

  By the way, it has a network switch that handles the traffic of the low-level network and the network switch that accommodates the traffic of the high-level network. The network management means that collects each switch link information and the traffic status of the virtual high-order path A technique for monitoring has been proposed (see, for example, Patent Document 1).

  Also, when the failure fact is recognized, the line failure control and the line connection control according to the line failure are appropriately performed in the upper layer while grasping all the line failures in the lower layer of the failure history with the recognized failure event phenomenon and date / time as an unprocessed failure. A technique to be performed is proposed (see, for example, Patent Document 2).

JP 2003-234773 A JP 2005-31463 A

  When the IP network is targeted, the communication path of the IP device is dynamically changed by various redundancy technologies. For this reason, in a highly redundant network, it is very difficult to grasp the influence on the communication service. For this reason, in the conventional network management system, all communication paths through which communication packets can be communicated are stored in a database, and the work management function provides communication services that cannot be communicated due to the influence of L2 switches and L3 switches that are stopped by construction. Extracting. As described above, there is a problem that a database for holding all communication paths requires a huge capacity.

  Conventionally, the influence on the communication service is determined based on the presence or absence of a communication path through which communication is possible. That is, if there is a communication path that can be communicated, the communication service is normal, and if there is no communication path, the communication service is only determined to be stopped.

  An object of the disclosed network management system is to reduce the capacity for holding route information.

A network management system according to an embodiment of the disclosure is a network management system that manages devices that constitute a network.
Path information holding means for holding, as path information, a working path in each layer and one representative detour path with a few sections overlapping with the working path for each path between the start-end device and the end-device in the network;
By instructing a stop device to stop in the network, it is determined whether there is a stop section including the stop device in the working route and the representative detour route of each route information stored in the route information holding means. have a, a determination unit configured to determine influence of the stopping device, said determination means, the said path when the stop section does not exist, it is determined that the normal to the current path of the path information, the working path of the path information When the stop section exists and the stop section does not exist in the representative bypass route of the route information, it is determined that there is an instantaneous interruption in the route information, and the stop section exists in the working route of the route information and the representative bypass of the route information When the stop section exists in the route, the route is determined to be stopped, the stop section exists in the working route of the route information, and the stop section exists in the representative bypass route of the route information. Come, it is determined that there is an instantaneous interruption in the path if there is communication possible route only a path that bypasses the stop section of the working path or the representative detour path.

  According to the present embodiment, it is possible to reduce the capacity for holding route information.

1 is a configuration diagram of an embodiment of a network system. It is a hardware block diagram of one Embodiment of a network management system. It is a functional block diagram of one Embodiment of a network management system. It is a figure which shows one Embodiment of the management method of network configuration information. It is a figure which shows the format of network configuration information, route information, and construction schedule information. It is a figure which shows the layer structure and network structure information of a L2 ring layer. It is a flowchart of one Embodiment of the logical path generation process of L2 ring. It is a figure which shows one Embodiment of a route information database. It is a figure which shows the layer structure and network structure information of a L3 network layer. It is a flowchart of one Embodiment of a logical path generation process between L3 switches. It is a figure which shows one Embodiment of the structure information of the added L3 link path. It is a figure which shows one Embodiment of a route information database. It is a figure for demonstrating the logical path between L3 switches. It is a figure for demonstrating the influence on the communication service accompanying construction implementation. It is a flowchart of one Embodiment of an influence determination process. It is a figure which shows the example of a display of a network management terminal.

  Embodiments will be described below with reference to the drawings.

<Network system>
FIG. 1 shows a configuration diagram of an embodiment of a network system. In FIG. 1, the monitoring target network 10 includes L2 switches 11 to 17 and L3 switches 21 to 25 as monitoring target devices. The L2 switches 11 to 14 have a ring configuration. The L2 switch 15 is connected to the L3 switch 22, and the L2 switches 16 and 17 are connected to the L3 switch 25.

  The L2 switch 11 is connected to the L3 switch 21 in the station A, and a terminal device 26 is connected to the L3 switch 21. The L2 switch 12 is connected to the L3 switch 22 in the B station, and the terminal device 27 and the L2 switch 15 are connected to the L3 switch 22. The L2 switch 13 is connected to the L3 switch 23 in the C station, and the terminal device 28 is connected to the L3 switch 23.

  The L2 switch 14 is connected to the L3 switch 24 in the D station, and the L2 switch 14 is connected to the L2 switch 17 in the E station. The L2 switch 17 is connected to the L3 switch 25 in the E station, and the terminal device 29 is connected to the L3 switch 25. The L3 switch 25 is connected to the L2 switch 16, and the L2 switch 16 is connected to the L2 switch 15 in the B station.

  A network management terminal 30 a is connected to the network management system 30, and the network management system 30 holds network configuration information including connection relationships of the L2 switches 11 to 17 and L3 switches 21 to 25 constituting the monitored network 10. And manage. Further, the network management system 30 monitors the failure of each of the L2 switches 11 to 17 and the L3 switches 21 to 25 constituting the monitoring target network 10. Furthermore, the network management system 30 manages work plans such as inspections and construction work on network devices such as the L2 switches 11 to 17 and the L3 switches 21 to 25.

<Network management system>
FIG. 2 shows a hardware configuration diagram of an embodiment of the network management system. 2, the network management system 30 includes a CPU 31, a memory 32, a hard disk device 34, a display / keyboard 35, a network configuration information database 36, a route information database 37, a construction schedule database 38, and a communication interface 39. Are connected by an internal bus 40.

  The CPU 32 executes various kinds of processing such as network configuration registration processing, route information generation processing, and construction schedule registration processing by executing software stored in the memory 32 or the hard disk device 34. Then, the network configuration information obtained by the network configuration registration process is held in the network configuration information database 36, the route information generated by the route information generation process is held in the route information database 37, and the construction schedule obtained by the construction schedule registration process is stored. Information is stored in the construction schedule database 38. The memory 32 is used as a work area when executing various processes. The communication interface 36 is connected to the network management terminal 30a and part or all of the L2 switches 11 to 17 and L3 switches 21 to 25, and between the network management terminal 30a, the L2 switches 11 to 17, and the L3 switches 21 to 25. Communicate.

<Network management system>
FIG. 3 shows a functional configuration diagram of an embodiment of the network management system. In FIG. 3, the network management system 30 includes a network configuration registration processing unit 41, a route information generation processing unit 42, and a construction schedule registration processing unit 43.

  The network configuration registration processing unit 41 has a network configuration registration processing 41a. When network configuration information including connection relationships between the L2 switches 11 to 17 and the L3 switches 21 to 25 is input from the network management terminal 30a, the network configuration registration process 41a stores the input network configuration information in the network configuration information database 36. sign up.

  The path information generation processing unit 42 includes a monitoring target device information collection process 42a and a path information generation process 42b. The monitoring target device information collection processing 42a accesses the monitoring target devices such as the L2 switches 11 to 17 and the L3 switches 21 to 25 through the communication interface 39 according to the instruction from the network configuration registration processing 41a, and obtains the routing information of each monitoring target device. collect. The collected routing information of each monitoring target device is stored in the route information database 37 from the route information generation process 42b.

  The route information generation process 42 b generates route information in each monitored device from the collected routing information of each monitored device and registers it in the route information database 37.

  The construction schedule registration processing unit 43 includes a construction schedule registration process 43a and an influence determination process 43b. When a construction schedule is input from the network management terminal 30a, the construction schedule registration process 43a registers the input construction schedule in the construction schedule database 38. The influence determination process 43b accesses the network configuration information database 36 and the route information database 37 according to the construction schedule registered from the construction schedule registration process 43a, and the registered construction schedule affects each monitoring target device. And the determination result is held in the construction schedule database 38.

<Network configuration information management method>
FIG. 4 shows an embodiment of a method for managing network configuration information. This network configuration information is held in the network configuration information database 36. The network configuration information shown in FIG. 4 is managed in five layers of service layer, L3 network layer, L2 ring layer, L2 layer, and physical layer according to the protocol, and between the layers indicated by broken arrows in the figure. Manage the correspondence of. It is assumed that the network configuration information is registered in the network configuration information database 36 by using the network configuration registration process 41a by the administrator of the network management system.

  In the lowermost “physical layer” in FIG. 4, connection information by physical cables and optical fibers is managed. The “L2 layer” manages connection information in the data link layer based on Ethernet (registered trademark) or the like. The “L2 ring layer” manages a redundant configuration based on the ring protocol. The “L3 network layer” manages the configuration of the dynamic routing network based on L3. The “service line layer” manages end-to-end connections between terminals. The correspondence between each layer is indicated by an arrow from the upper layer to the lower layer.

  FIG. 5A shows a format of one embodiment of network configuration information held in the network configuration information database 36. Each network configuration information includes a network name, a starting device, a terminating device, a network type, a lower layer path 1, a lower layer path 2, a lower layer path 3, a lower layer path 4,. The network name is filled with a name that identifies the network. A device name that is the start of the network is entered in the start device, and a device name that is the end of the network is entered in the end device. As the network type, any one of a normal network, a ring configuration network, and a network configuration network is entered. In the lower layer paths 1 to n, lower layer paths constituting the network are sequentially entered.

  FIG. 5B shows a format of one embodiment of route information held in the route information database 37. Each route information includes a network name, a starting device, a terminating device, a route type, a lower layer path 1, a lower layer path 2, a lower layer path 3, a lower layer path 4,. The network name is filled with a name that identifies the network. A device name that is the start of the network is entered in the start device, and a device name that is the end of the network is entered in the end device. As the route type, either a normal route or a detour route (that is, a representative detour route) is entered. In the lower layer paths 1 to n, lower layer paths constituting the network are sequentially entered.

  FIG. 5C shows a format of an embodiment of construction schedule information held in the construction schedule database 38. Each piece of construction schedule information includes a construction start date and time, a construction end date and time, a construction target 1, a construction target 2, a construction target 3, a construction target 4,. The date and time of starting construction is entered in the construction start date and time. The date and time when construction is completed is entered in the construction completion date and time. In the construction objects 1 to n, names of communication devices such as L2 switches, L3 switches, or terminal devices to be constructed in the network are entered. In other words, the communication devices designated by the construction objects 1 to n are stopped between the construction start date and time and the construction end date and time.

<L2 ring layer>
The L2 ring layer and the L3 network layer are layers in which the communication path is dynamically changed by the redundancy function of the communication device. When the paths of the L2 ring layer and the L3 network layer are registered, a “logical path” is automatically generated as a logical communication path for managing the communication path.

  FIG. 6 shows the layer configuration and network configuration information of an embodiment of the L2 ring layer. FIG. 6A shows the L2 ring path (9) of the L2 ring layer, the L2 links (5) to (8) of the L2 layer, and the physical links (1) to (4) of the physical layer. FIG. 6B shows network configuration information of the physical links (1) to (4), the L2 links (5) to (8), and the L2 ring path (9). This network configuration information is held in the network configuration information database 36. Here, the numbers in parentheses are numbers for identifying the L2 ring path, the L2 link, and the physical link.

<Logical path generation>
FIG. 7 shows a flowchart of an embodiment of an L2 ring logical path generation process executed by the path information generation process 42b. In FIG. 7, in step S <b> 1, the route information generation process 42 b acquires L2 links (5) to (8), which are lower layer paths constituting the L2 ring path (9), from the network configuration information database 36.

  In step S <b> 2, the path information generation process 42 b acquires the physical links (1) to (4) that are the lower layer paths of the L2 links (5) to (8) from the network configuration information database 36. In step S <b> 3, the path information generation process 42 b acquires the start and end devices of the physical links (1) to (4) from the network configuration information database 36. Here, the L2 switches 11 and 12 are acquired as the start and end devices for the physical link (1), and the L2 switches 12 and 14 are acquired as the start and end devices for the physical link (2). Further, the L2 switches 14 and 13 are acquired as the start and end devices for the physical link (3), and the L2 switches 13 and 11 are acquired as the start and end devices for the physical link (4).

  In step S4, the route information generation process 42b generates a logical path by performing a brute force combination of the acquired start and end devices. Here, a logical path between the L2 switch 11 and the L2 switch 12, a logical path between the L2 switch 11 and the L2 switch 13, a logical path between the L2 switch 11 and the L2 switch 14, and a logical path between the L2 switch 12 and the L2 switch 13 , A logical path between the L2 switch 12 and the L2 switch 14 and a logical path between the L2 switch 13 and the L2 switch 14 are generated.

  The L2 inter-switch logical path holds “normal route” and “representative detour route” as route information together with the relationship with the lower layer path. The normal route is a working route that is used during normal operation of the network. The representative detour route is a route that has the least number of sections that overlap with the normal route, that is, physical links, among communication routes that can be communicated.

  Here, in the L2 ring, there are two clockwise and counterclockwise paths between arbitrary L2 switches. Further, in the ring network, a block point is provided in one part of the ring network to prevent the communication packet from passing at a normal time so that the communication packet does not cause an infinite loop. That is, the communication packet flowing in the L2 ring is transferred so as not to pass through the block point in normal times. When a failure occurs, the block point passes a communication packet. Therefore, in the L2 ring, a route that does not pass through the block point is a normal route, and a route that passes through the block point is a bypass route.

  For this reason, in order to determine a normal route, block point information is acquired from an actual L2 communication device. Based on the acquired block point information, a route not passing through the block point is set as a normal route, and a route passing through the other block point is stored in the route information database 37 as a representative bypass route.

  FIG. 8 shows an embodiment of the route information database 37 that stores logical paths between L2 switches. For example, when the block point is in the physical link (3) in the L2 ring path (9), the L2 link (5) is connected to the lower layer path 1 of the logical path of the normal path between the L2 switch 11 and the L2 switch 12 in the path information database 37 And L2 links (8), (7), and (6) are stored in the lower-layer paths 1, 2, and 3 of the logical path of the representative detour path between the L2 switch 11 and the L2 switch 12.

<L3 network layer>
FIG. 9 shows the layer configuration and network configuration information of an embodiment of the L3 network layer. 9A shows an L3 network layer (31), an L2 ring path (9) of the L2 ring layer, L2 links (21) to (29) of the L2 layer, and physical links (11) to (11) of the physical layer. (19) is shown. FIG. 9B shows network configuration information of the L2 ring path (9), physical links (11) to (19), L2 links (21) to (29), and L3 network (31). This network configuration information is held in the network configuration information database 36. Here, the numbers in parentheses are numbers for identifying L3 network layers, L2 ring paths, L2 links, and physical links.

<Logical path generation>
FIG. 10 shows a flowchart of an embodiment of a logical path generation process between L3 switches executed by the path information generation process 42b. In FIG. 10, in step S11, the route information generation process 42b acquires the L2 ring path (9) and the L2 links (21) to (29), which are lower layer paths constituting the L3 network (31), from the network configuration information database 36. .

  In step S <b> 12, the route information generation process 42 b acquires the physical links (11) to (19) that are the lower layer paths of the L2 links (21) to (29) from the network configuration information database 36. In step S <b> 13, the path information generation process 42 b acquires the start and end devices of the physical links (11) to (19) from the network configuration information database 36. Here, the L3 switch 21 and the L2 switch 11 are acquired as the start and end devices for the physical link (11), and the L3 switch 22 and the L2 switch 12 are acquired as the start and end devices for the physical link (12). Further, the L3 switch 23 and the L2 switch 13 are acquired as the start end device and the end device for the physical link (13), and the L3 switch 24 and the L2 switch 14 are acquired as the start end device and the end device for the physical link (14).

  Further, the L3 switch 22 and the L2 switch 15 are acquired as the start end device and the end device for the physical link (15), and the L2 switch 15 and the L2 switch 16 are acquired as the start end device and the end device for the physical link (16). In addition, the L3 switch 25 and the L2 switch 16 are acquired as the start end device and the end device for the physical link (17), and the L3 switch 25 and the L2 switch 17 are acquired as the start end device and the end device for the physical link (18). The L2 switch 14 and the L2 switch 17 are acquired as the start and end devices for (19).

  In step S14, in the same manner as steps S1 to S3, the route information generation process 42b performs physical link (1) that is a lower layer path of each of the L2 links (5) to (8) that are lower layer paths constituting the L2 ring path (9). ) To (4) are acquired, and the start and end devices of the physical links (1) to (4) are acquired from the network configuration information database 36. Here, the L2 switches 11 and 12 are acquired as the start and end devices for the physical link (1), and the L2 switches 12 and 14 are acquired as the start and end devices for the physical link (2). Further, the L2 switches 14 and 13 are acquired as the start and end devices for the physical link (3), and the L2 switches 13 and 11 are acquired as the start and end devices for the physical link (4).

  In step S15, the path information generation process 42b obtains brute force combinations between the L3 switches for the acquired L3 switches 21 to 25. In step S16, the route information generation process 42b extracts a route that passes only through the L2 switch without passing through another L3 switch for each combination of L3 switches, and adds it to the network configuration information database 36 as L3 link path configuration information. . At this time, if the target L3 switch cannot be reached without passing through another L3 switch, it is not added to the network configuration information database 36 as an L3 link path. Further, a logical path between L3 switches corresponding to the L3 link path added to the network configuration information database 36 is generated and stored in the path information database 37.

  FIG. 11 shows an embodiment of L3 link path configuration information added to the network configuration information database 36. The first line in FIG. 11 shows the L3 link path (41) between the L3 switches 21 and 22, the network type is a normal route, and the L2 link (21), the L2 ring network (9), and the L2 link (22) It is composed of

  FIG. 12 shows an embodiment of a route information database 37 that stores logical paths between L3 switches. This L3 inter-switch logical path corresponds to the L3 link path configuration information shown in FIG. In the logical path between L3 switches, “normal route” and “representative detour route” as route information are held together with the relationship with the lower layer path. In FIG. 12, the L3 link path (41) is stored in the lower layer path 1 of the logical path of the normal path between the L3 switch 21 and the L3 switch 22, and the lower layer of the logical path of the representative bypass path between the L3 switch 21 and the L3 switch 22 L3 link paths (44) and (48) are stored in paths 1, 2 and 3, respectively.

  By the way, the L3 switch generates the routing information by calculating the cost value and the bandwidth and holds it by itself. For this reason, the normal route, which is the working route used during normal operation, can be known from the routing information collected from the actual L3 switch. The representative bypass route extracts all routes that can communicate between the L3 switches, assigns a physical section, that is, a physical link, to each route, and adopts a route that has the least number of sections that overlap with the normal route, that is, the physical link.

  Here, as the logical path between the L3 switches 21 and 22, route 1 to route 7 are conceivable as shown in FIG. Of these, the route 1 directly connecting the L3 switches 21 and 22 is the normal route. The remaining routes 2 to 7 are detour route candidates. Each detour route candidate is assigned to a physical link, and a route 7 having the least number of shared sections with the normal route is set as a representative detour route.

<Influence on communication services>
The influence on the communication service associated with the construction work will be described with reference to FIG. First, in the physical layer, the L2 switch 12 indicated by “b” in FIG. When the L2 switch 12 is stopped, the physical link connected to the L2 switch 12 is also stopped at the same time. Thereafter, the state of the lower layer is assumed to be taken over by the related higher layer path, and the influence of the physical layer is expanded to the upper layer L2 layer.

  In the L2 layer, the L2 link path affected by the physical layer is stopped.

  In the L2 ring layer, it is determined whether each logical path is affected by the physical layer, and it is determined whether there is normal or instantaneous interruption due to switching or stoppage. In the figure, a cross indicates a stop, a triangle indicates that there is a momentary interruption due to switching, and a circle indicates a normal state.

  In the L3 network layer, it is determined whether each logical path is affected by the L2 ring layer or the L2 layer, and it is determined whether the logical path is normal or has an instantaneous interruption due to switching or is stopped.

  In the service layer, it is determined whether each logical path is affected by the L3 network layer. Whether the logical path is normal, or there is an instantaneous interruption due to switching from a normal route to a representative detour route, etc., or there is no detour route and it is a stop Determine.

  As described above, in the L2 ring layer and the L3 network layer having a plurality of routes due to redundancy, “no effect” or “instantaneous stop due to route switching” depending on the presence / absence of a route that can communicate or cannot communicate with a normal route. , “Cannot communicate” can be determined.

<Effect determination processing>
FIG. 15 shows a flowchart of an embodiment of the influence determination process executed by the influence determination process 43b. When the communication devices indicated by the construction targets 1 to n of the construction schedule information read from the construction schedule database 38 are in a stopped state, the influence determination process 43b is performed by the logical path between the L2 switches stored in the path information database 37. For the logical path between the L3 switches, the influence determination process of FIG. 15 is executed in order from the lower layer layer and for each logical path to determine the influence of the communication device whose use is stopped.

  In FIG. 15, in step S21, the influence determination process 43b selects logical paths in order from the path information database 37, reads information on the normal path and representative detour path of the selected logical path, and uses it for the lower layer path of the normal path of the logical path. It is determined whether there is no stop section including a stopped communication device and the normal route of the logical path is normal. If the normal route is normal, “normal” is displayed in step S22.

  On the other hand, if there is a stop section in the lower layer path of the normal path of the logical path, the influence determination process 43b does not include a stop section including the communication device that is suspended in the lower layer path of the representative bypass path of the logical path in step S23. First, it is determined whether the representative detour route of the logical path is normal. If the representative detour route is normal, “instantaneous interruption due to switching” is displayed in step S24.

  On the other hand, if there is a stop section in the lower layer path of the representative bypass path of the logical path, in step S25, the influence determination process 43b has several stop sections in the normal path of the logical path and the lower path of the representative bypass path. To determine whether the number of stop sections of the normal route or the representative bypass route is equal to or less than a predetermined value N. If the number of stop sections of the normal route or the representative bypass route is equal to or less than the predetermined value N, the process proceeds to step S26. Here, the predetermined value N is 1, for example, but may be an integer of 2 or more.

  In step S <b> 26, the influence determination process 43 b searches the network configuration information database 36 for a route (another route) that bypasses only a stop route of the normal route or the representative bypass route, and a communicable route that does not include the stop segment in the searched another route. Determine if there is any. If there is a communicable route in the other route, “There is a momentary interruption due to switching” is displayed in step S24. Note that searching for another route that bypasses only the stop section in the network configuration information database 36 is easier and shorter than searching for another route of the entire logical path.

  If there is no communicable route in the other route, the process proceeds to step S27. Further, when the number of stop sections of the normal route and the representative detour route exceeds the predetermined value N, the process proceeds to step S27. In step S27, the influence determination process 43b searches the network configuration information database 36 for another route of the entire logical path excluding the normal route and the representative bypass route of the logical path, and does not include the stop section in the different route of the entire logical path. Determine whether there is a communicable route. If there is a communicable route in another route of the entire logical path, “instantaneous interruption due to switching” is displayed in step S24. If there is no communicable route in another route of the entire logical path, “stop” is displayed in step S28.

<Display example>
FIG. 16 shows an example in which the result of performing the influence determination process is displayed on the network management terminal 30a. In FIG. 16, the display unit 50 of the network management terminal 30a has a first display unit 51 that displays the influence of the inter-terminal service and a second display unit 52 that displays the network configuration. In the first display unit 51, the service between terminals A and B and the service between terminals C and D when the L2 switch 12 indicated by “b” in FIG. It is said that there is an instantaneous stop by switching the track. In the second display section 52, the L2 switch 12 that stops at the construction object indicated by “b” in the figure is shown in a satin area, and the normal path between the terminal device of the A station and the terminal device of the B station is indicated by a thick solid line. Yes.

  According to this embodiment, the network is hierarchized to manage the correspondence between the hierarchies. Also, in a hierarchy where there are multiple communication paths due to network redundancy, it is possible to avoid an increase in the capacity of the path information of the communication path by storing in the database only two paths, the “normal path” and the “representative bypass path”. Can do.

In addition, by setting a route having the least number of sections overlapping with the normal route among the communication routes that can be communicated as the representative bypass route, it is possible to reduce the possibility that the normal route and the bypass route cannot be communicated simultaneously. In addition, when there is a stop section on the normal route and there is no stop section on the representative bypass route, it is possible to determine whether the communication route is temporarily disconnected, that is, an instantaneous disconnection, in order to switch from the normal route to the representative bypass route. .
(Appendix 1)
In a network management system for managing devices constituting a network,
Path information generating means for generating, as path information, an active path in each layer and one representative detour path with a small number of sections overlapping with the active path for each path between the start and end apparatuses in the network;
Route information holding means for holding the route information generated by the route information generating means;
By instructing a stop device to stop in the network, it is determined whether there is a stop section including the stop device in the working route and the representative detour route of each route information stored in the route information holding means. Determining means for determining the influence of the stopping device;
A network management system comprising:
(Appendix 2)
In the network management system described in Appendix 1,
The determination unit determines that the route is normal when the stop section does not exist in the working route of the route information, and the stop section exists in the working route of the route information, and the stop is in the representative detour route of the route information. When there is no section, it is determined that there is an instantaneous interruption in the route, and when the stop section exists in the current route of the route information and the stop section exists in the representative detour route of the route information, the route is determined to be stopped. ,
A network management system characterized by that.
(Appendix 3)
In the network management system described in Appendix 2,
The determination unit detours only the stop section of the working path or the representative bypass path when the stop section exists in the working path of the path information and the stop section exists in the representative bypass path of the path information. If there is a communicable route in the route, it is determined that there is an instantaneous interruption in the route.
A network management system characterized by that.
(Appendix 4)
In the network management system described in Appendix 3,
The determination means, when the stop section exists in the working path of the path information and the stop section exists in the representative detour path of the path information, in the path between the starting device and the terminating device, the working route and the If there is a communicable route that does not include the stop section in another route excluding the representative bypass route, it is determined that there is a momentary interruption in the another route.
A network management system characterized by that.
(Appendix 5)
In the network management system described in Appendix 4,
The route information generating means obtains the working route from the routing information of the device obtained by accessing the device constituting the network.
A network management system characterized by that.
(Appendix 6)
An influence determination method for determining an influence of a device to be stopped in a network management system that manages devices constituting a network,
For each route between the start device and the end device in the network, the current route in each layer and one representative detour route with few sections overlapping with the current route are generated as route information,
Hold the generated route information in the route information holding means,
By instructing a stop device to stop in the network, it is determined whether there is a stop section including the stop device in the working route and the representative detour route of each route information stored in the route information holding means. An influence determination method, wherein the influence by the stop device is determined.
(Appendix 7)
In the impact determination method described in Appendix 6,
In the determination of the influence, when the stop section does not exist in the working route of the route information, the route is determined to be normal, the stop section exists in the working route of the route information, and the representative detour route of the route information When there is no stop section, it is determined that there is an instantaneous interruption in the route, and when the stop section exists in the current route of the route information and the stop section exists in the representative bypass route of the route information, the route is determined to be stopped. To
An effect determination method characterized by the above.
(Appendix 8)
In the impact determination method described in Appendix 7,
The determination of the influence is made by detouring only the stop section of the working path or the representative bypass path when the stop section exists in the working path of the path information and the stop section exists in the representative bypass path of the path information. If there is a communicable route in the route to be determined, it is determined that there is an instantaneous interruption in the route.
An effect determination method characterized by the above.
(Appendix 9)
In the impact determination method described in Appendix 8,
In the determination of the influence, when the stop section exists in the working path of the path information and the stop section exists in the representative detour path of the path information, the path between the starting device and the terminating device is If there is a communicable route that does not include the stop section in another route excluding the representative detour route, it is determined that there is an instantaneous interruption in the route.
An effect determination method characterized by the above.
(Appendix 10)
In the impact determination method described in Appendix 9,
The working path is obtained from the routing information of the device obtained by accessing the device constituting the network.
An effect determination method characterized by the above.

DESCRIPTION OF SYMBOLS 10 Monitored network 11-17 L2 switch 21-25 L3 switch 26-29 Terminal device 30 Network management system 30a Network management terminal 31 CPU
32 Memory 34 Hard Disk Device 35 Display / Keyboard 36 Network Configuration Information Database 37 Route Information Database 38 Construction Schedule Database 39 Communication Interface 40 Internal Bus 41 Network Configuration Registration Processing Unit 41a Network Configuration Registration Processing 42 Path Information Generation Processing Unit 42a Monitoring Target Device Information Collection processing 42b Route information generation processing 43 Construction schedule registration processing section 43a Construction schedule registration processing 43b Influence determination processing

Claims (4)

In a network management system for managing devices constituting a network,
Path information generating means for generating, as path information, an active path in each layer and one representative detour path with a small number of sections overlapping with the active path for each path between the start and end apparatuses in the network;
Route information holding means for holding the route information generated by the route information generating means;
By instructing a stop device to stop in the network, it is determined whether there is a stop section including the stop device in the working route and the representative detour route of each route information stored in the route information holding means. Determining means for determining the influence of the stopping device;
I have a,
The determination means includes
When the stop section does not exist in the working route of the route information, the route is determined to be normal, and when the stop section exists in the working route of the route information and the stop section does not exist in the representative bypass route of the route information It is determined that there is an instantaneous interruption in the route, and when the stop section exists in the working route of the route information and the stop section exists in the representative detour route of the route information, the route is determined to be stopped,
A path that can communicate with the working path or a path that bypasses only the stop section of the representative bypass path when the stop section exists in the working path of the path information and the stop section exists in the representative bypass path of the path information If there is, it is determined that there is a momentary interruption on the route.
A network management system characterized by that. The network management system according to claim 1 ,
The determination means, when the stop section exists in the working path of the path information and the stop section exists in the representative detour path of the path information, in the path between the starting device and the terminating device, the working route and the If there is a communicable route that does not include the stop section in another route excluding the representative bypass route, it is determined that there is a momentary interruption in the another route.
A network management system characterized by that. An influence determination method for determining an influence of a device to be stopped in a network management system that manages devices constituting a network,
For each route between the start device and the end device in the network, the current route in each layer and one representative detour route with few sections overlapping with the current route are generated as route information,
Hold the generated route information in the route information holding means,
By instructing a stop device to stop in the network, it is determined whether there is a stop section including the stop device in the working route and the representative detour route of each route information stored in the route information holding means. Determine the impact of the stopping device ;
The determination of the influence is
When the stop section does not exist in the working route of the route information, the route is determined to be normal, and when the stop section exists in the working route of the route information and the stop section does not exist in the representative bypass route of the route information It is determined that there is an instantaneous interruption in the route, and when the stop section exists in the working route of the route information and the stop section exists in the representative detour route of the route information, the route is determined to be stopped,
A path that can communicate with the working path or a path that bypasses only the stop section of the representative bypass path when the stop section exists in the working path of the path information and the stop section exists in the representative bypass path of the path information If there is, it is determined that there is a momentary interruption on the route.
An effect determination method characterized by the above. In the impact determination method according to claim 3 ,
In the determination of the influence, when the stop section exists in the working path of the path information and the stop section exists in the representative detour path of the path information, the path between the starting device and the terminating device is If there is a communicable route that does not include the stop section in another route excluding the representative bypass route, it is determined that there is a momentary interruption in the other route.
An effect determination method characterized by the above.

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