JP4808595B2 - Network information collection system and network information collection method - Google Patents

Description

  The present invention relates to a network information collection system and a network information collection method.

2. Description of the Related Art Conventionally, a technique for deriving a configuration of a communication network, that is, a physical connection relationship of devices in the communication network is known. The derived connection relationship is expressed by a network diagram or the like and used for network maintenance or the like. For example, Patent Document 1 below discloses a network system capable of grasping the physical connection relationship of nodes (devices) even when the networks are multiplexed. This network system first checks the network system to which the relay device belongs based on connection information received from the relay device connected to the node. Then, the network system determines the physical connection relationship between the nodes based on the entry data in which the information specifying the port and the information (entry) specifying one or more nodes connected to the port are associated with each other. Ask.
JP 2004-193966 A

  However, the connection relationship deriving method employed in the network system described in Patent Document 1 investigates the number of nodes corresponding to a port for each entry data, and extracts a part of information in an entry that satisfies a predetermined condition. The process of deleting and repeating entry data that satisfies another condition is repeated, and the process is complicated. As a result, the processing time tends to be longer depending on the scale of the network.

  The present invention has been made to solve the above problems, and provides a network information collection system and a network information collection method capable of more easily deriving the physical connection relationship between devices constituting a network. The purpose is to do.

  The network information collection system of the present invention is a network information collection system that collects connection destination information of communication ports of a plurality of devices existing on a network, and identifies information communication ports based on the collected connection destination information And a first generation unit that generates a plurality of first records associated with connection destination device information for specifying one or more other devices having a connection relationship with the communication port, and the first generation unit A second generation unit for generating a plurality of second records by adding own device information for identifying a device having a communication port corresponding to the first record to the connection destination device information in the first record; The connection destination device included in the first record by comparing the plurality of generated first records with the plurality of second records generated by the second generation means When the information matches the connection destination device information included in the second record, the device having the communication port corresponding to the first record and the device having the communication port corresponding to the second record are adjacent in the network. And determining means for determining that they are connected.

  The network information collection method of the present invention is a network information collection method for collecting connection destination information of communication ports of a plurality of devices existing on a network, and specifies a communication port based on the collected connection destination information. A first generation step for generating a plurality of first records in which information to be connected is associated with connection destination device information for specifying one or more other devices having a connection relationship with the communication port, and generated in the first generation step A second generation step of generating a plurality of second records by adding own device information for identifying a device having a communication port corresponding to the first record to the connection destination device information in the first record, and a first generation The plurality of first records generated in the step and the plurality of second records generated in the second generation step are compared, and the first record When the connection destination device information included in the node matches the connection destination device information included in the second record, a device having a communication port corresponding to the first record and a communication port corresponding to the second record are displayed. And a determination step of determining that the device is adjacently connected in the network.

  According to these network information collection system and network information collection method, a plurality of first records and second records are generated based on the collected connection destination information. Here, the difference between the first record and the second record is whether the device information identifying the device having the communication port is included in the connection destination device information associated with the information identifying the communication port. It is a point of no. Then, when a plurality of first records and a plurality of second records are compared and the connection destination device information of a certain first record matches the connection destination device information of a certain second record, it corresponds to the first record It is determined that the device having the communication port to be connected and the device having the communication port corresponding to the second record are adjacently connected. Thus, when deriving the physical connection relationship between devices, it is sufficient to compare the first record and the second record to determine whether or not they match. That is, the physical connection relationship between devices constituting the network can be derived more easily.

In the network information collection system of the present invention, the storage means for storing the assumed information indicating the number of each device assumed in the network and the connection relationship between the devices in advance, and the network information derived based on the collected connection destination information When the connection type information indicating the number of each device existing in the server is compared with a plurality of pieces of assumed information stored in the storage means, and the assumption information whose number of each device matches the connection type information is extracted. Based on the network configuration model created from the assumed information, the communication port for generating the first record is derived by excluding the connection destination information of the device existing at the branch connection destination from the collected connection destination information. Derivation means, and the first generation means generates a plurality of first records based on the connection port connection information derived by the derivation means. Door is preferable.

Further, in the network information collection method of the present invention, the storage step of storing in advance presumed information indicating the number of each device assumed in the network and the connection relationship between the devices , and derived based on the collected connection destination information, The connection form information indicating the number of each device existing on the network is compared with a plurality of pieces of assumed information stored in the storing step, and the assumed information in which the number of each device matches the connection form information is extracted. In this case, based on the network configuration model created from the assumed information, the communication port for which the first record is generated by excluding the connection destination information of the device existing at the branch connection destination from the collected connection destination information. A derivation step for deriving, wherein the first generation step is based on connection destination information of the communication port derived in the derivation step. To generate a plurality of first record Te is preferred.

  In this case, the assumption information that matches the connection form information is extracted by comparing the connection form information of the devices on the network derived based on the assumed information held in advance and the collected connection destination information. Then, the connection destination information of the branch connection destination device is excluded from the connection destination information collected based on the extracted assumed information, and the communication port that is the target for generating the first record is derived. Thereby, it is possible to narrow down the communication ports that are the targets for generating the first record, and it is possible to more easily derive the physical connection relationship between the devices constituting the network. Note that a device existing at a branch connection destination excludes one communication path from a plurality of communication paths when one communication path is branched into a plurality of communication paths in a certain device on the communication path. A device that exists at the end of another communication path.

  According to such a network information collection system and network information collection method, it is possible to more easily derive a physical connection relationship between devices constituting the network.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

  First, the functional configuration of the network information collection server (network information collection system) 10 according to the embodiment will be described with reference to FIG. FIG. 1 is a diagram illustrating a functional configuration of the network information collection server 10. The network information collection server 10 is connected to the communication network 20.

  The communication network 20 includes layer 3 switches 21a and 21b, load balancers 22a and 22b, layer 2 switches 23a and 23b, and a plurality of servers 24. Load balancers 22a and 22b are connected to the lower layer of the layer 3 switches 21a and 21b, and layer 2 switches 23a and 23b are connected to the lower layer of the load balancers 22a and 22b. A plurality of servers 24 are connected in parallel below the layer 2 switches 23a and 23b.

  Among these, the layer 3 switch 21a, the load balancer 22a, and the layer 2 switch 23a are active systems that operate during normal times. On the other hand, the layer 3 switch 21b, the load balancer 22b, and the layer 2 switch 23b are standby systems that operate when a failure occurs in the active system. Since the layer 3 switch 21a and the layer 3 switch 21b have the same virtual IP address and exchange network connection information with each other, even if a failure occurs in the layer 3 switch 21a, the layer 3 switch 21b smoothly Can be switched. The relationship between the load balancer 22a and the load balancer 22b and the relationship between the layer 2 switch 23a and the layer 2 switch 23b are the same as the relationship between the layer 3 switch 21a and the layer 3 switch 21b.

  The network information collection server 10 collects network setting information (connection destination information) of a plurality of devices constituting the communication network 20, and uses the network setting information to physically connect the devices constituting the communication network 20. Derive relationships. For this purpose, the network information collection server 10 includes, as functional components, a setting information collection unit 11, a storage unit (storage unit) 12, a determination target port derivation unit (derivation unit) 13, and a first connection table generation unit (first 1 generation unit) 14, a second connection table generation unit (second generation unit) 15, a connection relationship determination unit (determination unit) 16, and a network diagram creation unit 17.

  The setting information collection unit 11 collects network setting information of a plurality of devices constituting the communication network 20 and outputs the collected network setting information to the storage unit 12. Specifically, the setting information collection unit 11 uses the device maintenance IP address (hereinafter, referred to as “maintenance IP”), the device basic information indicating the device attributes, and the virtual LAN (hereinafter referred to as “VLAN”). And L2 search VLAN information indicating whether it belongs to. The maintenance IP is stored in a maintenance IP management table (not shown) in the storage unit 12, and the setting information collection unit 11 can acquire the maintenance IP from this table. In addition, the setting information collection unit 11 collects network setting information of communication ports included in the device using a maintenance IP based on an instruction from the determination target port deriving unit 13 described later.

  The device basic information includes at least a generation number for managing a collection history for each device, a maintenance IP, a host name for identifying the device, and a model ID for identifying the model. It is. For example, device basic information including a generation number “1”, a maintenance IP “10.20.0.165”, a host name “L3SW01”, and a model ID “L3SW” is collected.

  The L2 search VLAN information includes at least a network ID for identifying a network, a segment ID for identifying a segment for dividing and managing one network, a VLAN-ID for identifying a VLAN, an IP address of a device, The network address of the device, the subnet mask of the device, and the maintenance IP are associated with each other. For example, network ID “N01”, segment ID “S01”, VLAN-ID “300”, IP address “192.168.0.10”, network address “192.168.0.0”, subnet mask “255. L2 search VLAN information consisting of “255.255.0” and maintenance IP “10.20.0.165” is collected. This L2 search VLAN information can be said to be information obtained by organizing network device information using VLAN-IDs and IP addresses.

  The storage unit 12 includes a device basic information table 12a for storing device basic information and an L2 search VLAN table 12b for storing L2 search VLAN information, and the device basic information input from the setting information collection unit 11 And L2 search VLAN information is stored in these tables. For example, device basic information of a plurality of devices constituting the communication network 20 is stored as shown in FIG. 2, and L2 search VLAN information of these devices is stored as shown in FIG. In FIG. 2, model IDs “L3SW”, “LB”, “L2SW”, and “SV” represent a layer 3 switch, a load balancer, a layer 2 switch, and a server, respectively.

In addition, the storage unit 12 stores in advance the assumed information indicating the network configuration model ( assumed connection form between a plurality of devices ) in the assumed information table 12c. This assumption information is obtained by associating a plurality of pieces of data in which at least a model ID and the number of devices having the model ID are associated with a connection form ID for identifying an assumed connection form. For example, as illustrated in FIG. 4, assumption information in which data on model IDs “L3SW”, “LB”, and “L2SW” is associated with connection type ID “connection type 1” is stored.

  5 is a network configuration model based on the assumption information shown in FIG. 4. FIG. 5A corresponds to the assumption information whose connection ID is “connection form 1”, and FIG. This corresponds to the assumed information of “form 2”. In the network configuration model shown in FIG. 5A, a load balancer is connected to the lower layer of the layer 3 switch, a layer 2 switch is connected to the lower layer of the load balancer, and a plurality of servers are installed in parallel to the lower layer of the layer 2 switch. The connected connection form is shown. In this network configuration model, the layer 3 switch, the load balancer, and the layer 2 switch are duplicated. On the other hand, the network configuration model shown in FIG. 5B has a connection configuration in which a duplicated layer 2 switch is provided below each of the two routers, and a plurality of servers are installed in parallel below the layer 2 switch. Show.

  When creating a network configuration model based on the assumption information, information such as the connection relationship between models is also used, but this information may be included in the assumption information or other information not shown in the storage unit 12. May be stored in the table. Further, information such as the connection relationship between models may be embedded in a program for deriving a network configuration model.

  Furthermore, the storage unit 12 stores connection data indicating a physical connection relationship between devices in the connection relationship table 12d. This connection data is input from the connection relationship determination unit 16.

  The determination target port deriving unit 13 uses the device basic information table 12a and the assumed information table 12c stored in the storage unit 12 to derive a communication port from which a physical connection relationship is derived in the communication network 20. Then, the result is output to the first connection table generation unit 14. For this purpose, the determination target port deriving unit 13 first calculates the number of devices in the communication network 20 by counting the device basic information stored in the device basic information table 12a for each model ID. (Derive connection type information). Then, the determination target port deriving unit 13 extracts the assumed information in which the number of devices for each device matches from the assumed information table 12c. In this extraction, since the number of servers is not taken into consideration, there is no problem even if the information on the server is not stored in the assumed information table 12c.

  For example, when the contents of the device basic information table 12a are as shown in FIG. 2, the determination target port deriving unit 13 calculates that there are two layer 3 switches, two load balancers, and two layer 2 switches. Then, the determination target port deriving unit 13 extracts the assumption information that matches the calculation result from the assumption information table 12c illustrated in FIG. Here, assumption information whose connection form ID is “connection form 1” is extracted. In other words, the network configuration of the communication network 20 (connection mode between devices existing on the communication network 20) is that each of the layer 3 switch, the load balancer, and the layer 2 switch is duplicated, and a plurality of servers are arranged in parallel under the layer 2 switch. It is judged that it is installed.

  Since it is transparent to the layer 2 switch in terms of network, the determination target port deriving unit 13 is a device directly connected to the layer 2 switch in order to obtain a physical connection relationship between the layer 2 switch and another device. Use the information. For example, when the extracted network configuration model is as shown in FIG. 5A, the determination target port deriving unit 13 uses the MAC addresses of the server and the load balancer registered in the layer 2 switch. Thus, a physical connection relationship between this layer 2 switch and another device is obtained.

  Then, the determination target port deriving unit 13 excludes the network setting information of the device existing at the branch connection destination from the collected network setting information. For example, when the assumption information having the connection type ID “connection type 1” is extracted, the determination target port deriving unit 13 first determines whether the standby layer 3 switch 21b, load balancer 22b, and layer 2 switch 23b are Excluded. As a method of excluding these standby devices, for example, an item called a standby flag (not shown) is provided in the device basic information table 12a, and the value of the standby flag is set for each device (for example, the active system). It is conceivable to search and exclude a standby device (for example, a device whose standby system flag is “1”).

  Further, the determination target port deriving unit 13 excludes the plurality of servers 24 connected to the lower layer of the layer 2 switch 23a and the layer 2 switch 23b. As a method of removing the plurality of servers 24, for example, it is conceivable to search for and exclude a device whose model ID is “SV” from the device basic information table 12a. As a result, the layer 3 switch 21a, the load balancer 22a, and the layer 2 switch 23a are extracted. In the following description, the portion of the communication network 20 that includes the extracted layer 3 switch 21a, load balancer 22a, and layer 2 switch 23a is referred to as a determination target portion 30.

  Thereafter, the determination target port deriving unit 13 outputs an instruction to collect the network setting information of each communication port included in the extracted layer 3 switch 21a, load balancer 22a, and layer 2 switch 23a to the setting information collecting unit 11, The network setting information for each communication port collected by the setting information collection unit 11 is acquired according to the instruction. Then, the determination target port deriving unit 13 outputs the acquired network setting information for each communication port to the first connection table generating unit 14.

  The first connection table generation unit 14 generates a first connection table indicating information on devices connected to the communication port for each communication port, based on the network setting information input from the determination target port deriving unit 13. Thereafter, the first connection table generation unit 14 outputs the generated first connection table to the second connection table generation unit 15 and the connection relationship determination unit 16.

  The first connection table includes a host name, a port number for identifying a communication port in the device (information specifying the communication port), an IP address of the communication port, a VLAN-ID of the communication port, and a communication port. This is a set of data (first record) associated with connection destination device information (hereinafter referred to as “first connection list”) including one or more IP addresses of devices to be connected. Note that the IP addresses included in the first connection list are only IP addresses included in the devices (devices existing in the determination target portion 30) included in the network setting information input from the determination target port deriving unit 13.

  As an example, a case will be described in which network setting information of each communication port included in the layer 3 switch 21a, the load balancer 22a, and the layer 2 switch 23a is input from the determination target port deriving unit 13. In this case, as shown in FIG. 6, the first connection list corresponding to the layer 3 switch 21 a (host name “L3SW01”) includes the IP for the load balancer 22 a and the layer 2 switch 23 a existing in the determination target portion 30. Only the address is included, and the IP address of the device (for example, the layer 3 switch 21b) existing outside the determination target portion 30 is not included. A first connection list corresponding to the load balancer 22a (host name “LB01”) and a first connection list corresponding to the layer 2 switch 23a (host name “L2SW01”) are generated in the same manner. For the load balancer 22a, a first record related to the communication port P1 connected to the layer 3 switch 21a and a first record related to the communication port P2 connected to the layer 2 switch 23a are generated.

  The second connection table generation unit 15 generates a second connection table based on the first connection table input from the first connection table generation unit 14 and outputs the second connection table to the connection relationship determination unit 16. Specifically, the connection relationship determination unit 16 adds the IP address (own device information) of the device including the communication port itself to the first connection list for each first record in the first connection table. A 2-connection table is generated. That is, the second connection table is a set of second records. In the following description, the IP address of the communication port added to the first connection list is referred to as a “second connection list”.

  As an example, a case where the first connection table shown in FIG. 6 is input will be described. In this case, as shown in FIG. 7, the second connection list corresponding to the layer 3 switch 21a (host name “L3SW01”) is added to the first connection list corresponding to the layer 3 switch 21a. "192.168.0.10" is added. Similarly, the second connection list corresponding to the load balancer 22a (host name “LB01”) and the second connection list corresponding to the layer 2 switch 23a (host name “L2SW01”) are also generated.

  Based on the first connection table input from the first connection table generation unit 14 and the second connection table input from the second connection table generation unit 15, the connection relationship determination unit 16 Deriving the physical connection between devices. Specifically, first, the connection relationship determination unit 16 compares a plurality of first connection lists in the first connection table with a plurality of second connection lists in the second connection table, and a connection list that matches each other is obtained. Check for the presence. When a certain first connection list matches a certain second connection list, the connection relationship determination unit 16 identifies the device identified by the host name corresponding to the first connection list and the host name corresponding to the second connection list. It is determined that the device identified by is connected adjacently. The connection relationship determination unit 16 performs the above-described process until no matching connection list is found from the first connection table and the second connection table.

  The above processing will be described by taking as an example the case where the first connection table shown in FIG. 6 and the second connection table shown in FIG. 7 are input. In this case, as shown in FIG. 8, the first connection list corresponding to the communication port P1 of the layer 3 switch 21a matches the second connection list corresponding to the communication port P2 of the load balancer 22a. Therefore, the connection relationship determination unit 16 determines that the layer 3 switch 21a and the load balancer 22a are adjacently connected. Also, the second connection list corresponding to the communication port P1 of the load balancer 22a and the first connection list corresponding to the communication port P1 of the layer 2 switch 23a are identical. Therefore, the connection relationship determination unit 16 determines that the load balancer 22a and the layer 2 switch 23a are adjacently connected.

  Then, the connection relationship determination unit 16 creates connection data indicating the derived physical connection relationship and outputs the connection data to the storage unit 12. The connection data is created so that devices having the relationship are associated with each other. For example, when the above determination is made according to FIG. 8, the connection data in which the layer 3 switch 21a and the load balancer 22a are associated, and the connection in which the load balancer 22a and the layer 2 switch 23a are associated. Data is created and output to the storage unit 12.

  The network diagram creation unit 17 creates a network configuration diagram by reading the connection relationship data stored in the connection relationship table 12d by the connection relationship determination unit 16, and displays the network configuration diagram as information output means such as a display (not shown). Output to.

  Next, the operation of the network information collection server 10 shown in FIG. 1 will be described with reference to FIG. 9, and the network information collection method according to the present embodiment will be described. FIG. 9 is a flowchart showing the operation of the network information collection server 10.

  First, the setting information collection unit 11 collects network setting information of devices in the communication network 20 (step S01). Next, the determination target port deriving unit 13 derives a device whose connection relationship is to be determined based on the network information and the assumed information (storage step) stored in the storage unit 12 (step S02). , Derivation step). Then, the determination target port deriving unit 13 collects network setting information about the communication port of each communication port included in the derived device (step S03, derivation step). And based on this network setting information, the 1st connection table is produced | generated in the 1st connection table production | generation part 14 (step S04, 1st production | generation step). Further, the second connection table generation unit 15 generates a second connection table based on the first connection table (step S05, second generation step).

  Thereafter, the connection relation determination unit 16 compares the first connection list of the first connection table with the second connection list of the second connection table, and derives the physical connection relation between the devices in the determination target portion 30 ( Is determined) (step S06, determination step). The derived connection relationship is stored in the storage unit 12 by the connection relationship determination unit 16 as connection relationship data. Finally, a network configuration diagram is created by the network diagram creation unit 17 based on the connection relation data (step S07).

  According to this embodiment, the determination target port deriving unit 13 generates the first connection table in the first connection table generating unit 14 based on the network setting information of the communication port collected by the setting information collecting unit 11. The second connection table generation unit 15 generates a second connection table. Then, the connection relation determination unit 16 compares the plurality of first records with the plurality of second records, and when the first connection list of a certain first record matches the second connection list of a certain second record. It is determined that the device having the communication port corresponding to the first record and the device having the communication port corresponding to the second record are connected adjacently. Thus, when deriving the physical connection relationship between devices, it is sufficient to compare the first record and the second record to determine whether or not they match. That is, the physical connection relationship between the devices constituting the communication network 20 can be derived more easily.

  Further, according to the present embodiment, the determination target port deriving unit 13 calculates the number of units for each model from the network setting information collected by the setting information collecting unit 11, and this information and assumed information stored in the storage unit 12 in advance. Are compared, and assumption information in which the number of units for each model matches is extracted. Then, based on the extracted assumption information, the network setting information of the branch connection destination device is excluded from the collected network setting information, and the target communication port for generating the first record is derived. Thereby, the communication port of the object which produces | generates a 1st record can be narrowed down, and it becomes possible to derive | lead-out the physical connection relationship of the apparatuses which comprise the communication network 20 more easily.

  The present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above embodiment. The present invention can be modified in various ways as described below without departing from the scope of the invention.

  In the above embodiment, the devices existing in the communication network 20 are the layer 3 switch, the load balancer, and the layer 2 switch, but the device to be determined is not limited to this. For example, the communication network 20 may include a router, a power supply device, and a server. In the above embodiment, the IP address is collected as a part of the network setting information. However, the MAC address may be collected instead of the IP address.

  In the above embodiment, the network information collection system is configured by one network information collection server 10, but the configuration of the network information collection system is not limited to this, and the system is configured by a plurality of servers and devices. May be. For example, a network information collection system may be constructed by a data communication device that collects network setting information, a database server that stores data, a server that performs operations such as determination of connection relations, and creation of a network diagram.

It is a figure which shows the function structure of the network information collection server which concerns on embodiment. It is a figure which shows the example of the apparatus basic information table shown in FIG. It is a figure which shows the example of the L2 search VLAN table shown in FIG. It is a figure which shows the example of the assumption information table shown in FIG. FIG. 5 is a diagram illustrating a network configuration model based on the assumption information illustrated in FIG. 4, where (a) is based on assumption information of “connection form 1” illustrated in FIG. 4, and (b) is “connection form 2” illustrated in FIG. 4. This is based on the assumed information. It is a figure which shows the example of a 1st connection table. It is a figure which shows the example of a 2nd connection table. It is a figure which shows the example of a comparison with a 1st connection table and a 2nd connection table. It is a flowchart which shows operation | movement of a network information collection server.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Network information collection server (network information collection system), 12 ... Storage part (storage means), 13 ... Determination target port deriving part (derivation means), 14 ... First connection table generation part (first generation means), 15 ... 2nd connection table production | generation part (2nd production | generation means), 16 ... Connection relation determination part (determination means), 20 ... Communication network, 30 ... Determination object part.

Claims (4)

A network information collection system for collecting connection destination information of communication ports of a plurality of devices existing on a network,
Based on the collected connection destination information, a first record in which information specifying the communication port is associated with connection destination device information specifying one or more other devices having a connection relationship with the communication port First generation means for generating a plurality of;
A plurality of second records are generated by adding own device information specifying a device having a communication port corresponding to the first record to the connection destination device information in the first record generated by the first generation unit. Two generation means;
The plurality of first records generated by the first generation means and the plurality of second records generated by the second generation means are compared, and the connection destination device information included in the first record and the second record When the connection destination device information included in the network matches, the device having the communication port corresponding to the first record and the device having the communication port corresponding to the second record are connected adjacently in the network. A network information collection system comprising: a determination unit that determines that the network information is present. Storage means for preliminarily storing assumption information indicating the number of devices assumed in the network and a connection relationship between the devices ;
The connection form information indicating the number of each device existing on the network, derived based on the collected connection destination information, is compared with a plurality of assumption information stored in the storage means, and the number of each device Is extracted from the connection destination information collected from the connection destination information based on the network configuration model created from the assumption information when the assumption information matching the connection form information is extracted. Deriving means for deriving a communication port that is a target for generating the first record by excluding
The network information collection system according to claim 1, wherein the first generation unit generates a plurality of the first records based on communication port connection destination information derived by the deriving unit. A network information collection method for collecting connection destination information of communication ports of a plurality of devices existing on a network,
Based on the collected connection destination information, a first record in which information specifying the communication port is associated with connection destination device information specifying one or more other devices having a connection relationship with the communication port A first generation step of generating a plurality of;
A plurality of second records are generated by adding own device information identifying a device having a communication port corresponding to the first record to the connection destination device information in the first record generated in the first generation step. Two generation steps;
The plurality of first records generated in the first generation step and the plurality of second records generated in the second generation step are compared, and the connection destination device information included in the first record and the second record When the connection destination device information included in the network matches, the device having the communication port corresponding to the first record and the device having the communication port corresponding to the second record are connected adjacently in the network. A network information collection method comprising: a determination step of determining that the network information is present. A storage step for storing in advance assumption information indicating the number of devices assumed in the network and a connection relationship between the devices ;
The connection form information indicating the number of each device existing on the network derived based on the collected connection destination information is compared with a plurality of assumption information stored in the storing step, and the number of each device is compared. Is extracted from the connection destination information collected from the connection destination information based on the network configuration model created from the assumption information when the assumption information matching the connection form information is extracted. A derivation step of deriving a communication port for generating the first record by excluding
The network information collecting method according to claim 3, wherein the first generation step generates a plurality of the first records based on connection destination information of the communication port derived in the derivation step.

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