JP4567363B2 - Line bandwidth judgment system, line bandwidth judgment method and program - Google Patents

Description

  The present invention relates to a technique for identifying a line having insufficient bandwidth in a data communication network.

  In order to execute an application with sufficient performance in a business system having terminals and servers connected via a data communication network consisting of routers and lines, etc., it is sufficient to match the traffic generated by the application. It is required that there is a bandwidth of a simple line.

  Whether or not the bandwidth of the line is sufficient is generally determined by whether or not the bandwidth of the line is sufficiently larger than the traffic flowing through the line. Therefore, in order to determine whether or not the bandwidth of the line is sufficient, it is necessary to appropriately measure the traffic flowing through the line. For example, in a large-scale network, it is necessary to measure the traffic of many lines. Further, in a data communication network, since traffic fluctuation is generally large, it is necessary to constantly measure traffic.

In the prior art, traffic is measured by inserting a traffic measuring device into a line to be investigated and measuring packets flowing therethrough. As a conventional technique related to traffic measurement, for example, there is a technique described in Patent Document 1.
JP 2003-92625 A

  As described above, in the prior art, the traffic is measured by directly measuring the packets. Therefore, there is a problem that a great deal of cost and work are required when constantly measuring the traffic of many lines. Further, in the traffic measurement according to the conventional technology, there is a problem that a large amount of data is involved in the measurement, and the analysis consumes a large amount of network resources and computer resources.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a technique that makes it possible to easily determine whether or not a line has insufficient bandwidth without directly measuring traffic.

  The above-described problem is a line bandwidth determination system having a function of determining whether or not the bandwidth of a line between communication devices constituting a data communication network is insufficient, from a first communication device to a second communication device. A data loopback test result acquiring unit for acquiring a data loopback test result, a facility status information acquiring unit for acquiring facility status information related to a line connecting the first communication device and the second communication device, and the data A determination means for determining that the bandwidth of the line connecting the first communication device and the second communication device is insufficient when the return test result is not good and the equipment state is good; It can be solved by using a line bandwidth judgment system.

  According to the present invention, it is possible to easily determine whether or not the bandwidth of a line is insufficient without directly measuring the traffic flowing through the line.

  Further, when the data loopback test result acquisition unit acquires the data loopback test result from the communication device corresponding to one line, and the acquired data loopback test result is not good, the facility state information acquisition unit causes the facility status information acquisition unit to The process for acquiring the status information from the communication device is executed for a plurality of lines in the data communication network, and the data loopback test result and the equipment status information are associated with the data loopback test time for each line. By providing the means for storing in the storage device in the line bandwidth determination system, determination results for a plurality of lines can be accumulated. Further, according to the present invention, it is possible to easily and quickly determine whether or not the bandwidth of a line is insufficient. Therefore, even when the number of lines is large, a large amount of network resources and computer resources are not consumed.

  Further, the determination unit performs a bandwidth shortage determination for each line based on the information stored in the storage device, and calculates the number of occurrences of the bandwidth shortage in the line determined to be insufficient by the determination unit for each predetermined period. By providing a totaling means for totaling, it becomes possible to easily grasp the situation of the line bandwidth shortage.

  In addition, the line bandwidth determination system has a database that stores a line and a user name in association with each other, and the aggregation unit can perform aggregation for each user based on information in the database. It is possible to easily grasp the situation of insufficient line bandwidth in the network.

  An output means for outputting information indicating that the line is insufficient when the number of occurrences of insufficient band within a predetermined period for a specific line exceeds a predetermined threshold based on the result of the aggregation; By preparing for the line bandwidth determination system, it is possible to accurately determine that the line bandwidth is insufficient. Further, the output means obtains the mail address of the person in charge related to the line, and sends the information by e-mail to the mail address, so that the person in charge can promptly respond to a proposal for adding a line or the like. It becomes possible.

  As described above, according to the present invention, it is possible to easily determine whether or not the bandwidth of a line is insufficient without directly measuring the traffic flowing through the line. Further, when performing bandwidth determination for many lines, the conventional problem of consuming a large amount of network resources and computer resources is solved.

  Embodiments of the present invention will be described below with reference to the drawings.

(Principle of band shortage judgment)
First, the principle of the band shortage determination method used in this embodiment will be described. In the present embodiment, an IP packet such as a ping test from the router 2 to the router 1 in the configuration in which TCP / IP communication is performed between the router 1 and the router 2 as shown in FIG. (Hereinafter referred to as a packet loopback test. This is also referred to as a data loopback test). If the packet return test result is OK, it is determined that there is no bandwidth shortage on the line 3. If the packet return test result is NG, the equipment status corresponding to the line 3 in the router 2 is confirmed. If the confirmation result is OK, it is determined that the bandwidth is insufficient. It is determined that there is a failure.

  Here, ping (packet internet groper) in the ping test mentioned as an example of the data loopback test is one of applications using an ICMP (Internet Control Message Protocol) echo request message and an echo response message. This is a command for performing a loopback test (also referred to as layer 3, internet layer, etc.). When the IP address of the router 1 is specified and the ping command is executed in the router 2, the IP packet is transmitted to the router 1, and the router 1 returns the IP packet to the router 2. By the ping command, in addition to whether or not the destination router 1 has responded, the time until the response is received is known. In addition, when a timeout value can be set and no response is received within the time of the timeout value, it can be determined that the result of the ping test is NG. The router 2 can also determine the result of the ping test itself.

  Note that the ping test itself is a conventional technique and is generally used for confirming communication between routers. When the result of the ping test is NG because the execution of the ping command results in a packet loopback test in which the IP packet reaches the partner device and the partner device returns the IP packet via the same line. (1) The partner device is not operating normally due to a failure of the partner device, power off, etc. (2) The line between the devices is broken, (3) There is a lot of traffic for the line bandwidth, and between the devices It can be considered that any event of poor performance on the line (ie, insufficient bandwidth) has occurred. It should be noted that “the line is broken” includes a case where an interface device accommodating the line is broken in a communication device such as a router.

  The inspection of the equipment state includes the inspection of the state in the data link layer (also referred to as layer 2 or network interface layer) and the inspection of the state of the physical layer (hardware). In the above example, the data link layer state check is to check the state in the data link layer of the line through which the IP packet transmitted by the ping command passes. The state of the data link layer is performed by examining path monitoring data in a frame such as LAPD or LAPF which are protocols in the data link layer. This data may be held inside the router, and the router may determine the inspection result from the data, or an external monitoring device may acquire the data and the external device may determine it. If the data inspection result is NG, it indicates that, for example, hardware below the data link layer is not normal, and it can be considered that the event (1) or (2) has occurred. Further, the physical layer (hardware) state inspection is, for example, that the router checks hardware such as the interface unit of the line. If the router is NG, for example, the router indicates a hardware failure of the interface unit. Accumulate or output information indicating. That is, when the result of the equipment state inspection is NG, it can be considered that the event (1) or (2) has occurred. Moreover, if the result of an equipment state inspection is OK, it will be neither of said (1) and (2). The equipment state inspection itself is a conventional technique.

  As described above, if the packet loopback test result is NG on a certain line, one of the above events (1), (2), (3) has occurred, and the equipment on the line at almost the same time If the state inspection result is OK, neither of the above events (1) or (2) has occurred, so the packet return test result is NG and the equipment state inspection result is OK. If so, the above event (3), that is, a shortage of bandwidth has occurred.

(System configuration example)
Embodiments of the present invention will be described below. First, the system configuration in the present embodiment will be described with reference to FIG.

  As shown in FIG. 2, the system according to the present embodiment includes an equipment monitoring device 10 and an information analysis device 12. As shown in the figure, the equipment monitoring apparatus 10 is connected to a data communication network 14, and the information analysis apparatus 12 is connected to an analysis information distribution network 16.

  The data communication network 14 is a network that transmits and receives data generated by business applications, for example, and is a network used by a user. The data communication network 14 has a configuration in which a plurality of routers 18, 20, 22, 24, 26, 28 are connected by lines 30, 32, 34, 36, 33, 35.

  The analysis information distribution network 16 has a configuration in which the message transmission / reception server 38 and the message receiving terminals 40 and 42 are connected to a line in the example shown in FIG. The analysis information distribution network 16 is a network for distributing the analysis information output from the information analysis device 12 to the message receiving terminals 40 and 42.

  In the example shown in FIG. 2, for example, the routers 18, 20, and 22 are routers on the line operator side, and the routers 24, 26, and 28 are routers on the user side that receive services from the line operator. It is assumed that the equipment monitoring apparatus 10 can perform monitoring control of the routers 18, 20, and 22.

  The equipment monitoring apparatus 10 includes a loopback test management unit 101, a equipment state management unit 102, and an information management unit 103. The facility monitoring apparatus 10 is connected to the facility information database 104 and the user information database 105. Note that the equipment monitoring apparatus 10 may hold the equipment information database 104 and the user information database 105.

  The loopback test management unit 101 has a function of instructing the router to perform a packet loopback test and storing the result of the packet loopback test. The equipment state management unit 102 has a function of acquiring and storing equipment state inspection results from the router. The information management unit 103 is a user facility information to be described later on a line basis based on the information accumulated by the loopback test management unit 101 and the facility state management unit 102 and the information in the facility information database 104 and the user information database 105. It has a function of storing in the storage unit 121.

  An example of information stored in the facility information database 104 is shown in FIG. As shown in FIG. 3A, in the facility information database 104, the line number and the IP address of the router on the user side are stored in association with each other. It is assumed that the line number and the router on the line provider side are uniquely associated. Also, information stored in the user information database 105 is shown in FIG. As shown in FIG. 3B, the user information database 105 stores user names and line numbers in association with each other.

  The information analysis apparatus 12 includes a user facility information storage unit 121, an information determination unit 122, an information analysis unit 123, an analysis information storage unit 124, an information transmission unit 125, and a person-in-charge information storage unit 126.

  The user equipment information storage unit 121 has a function of storing packet return test results and equipment state inspection results in association with line numbers, user names, and the like. The information determination unit 122 has a function of performing a bandwidth shortage determination on a line based on the principle of the bandwidth shortage determination described first based on the information stored in the user facility information storage unit 121. Further, the information analysis unit 123 has a function of totaling information related to the line determined to be insufficient in bandwidth and storing the total result in the analysis information storage unit 124. The information transmission unit 125 has a function of transmitting the aggregation results accumulated in the analysis information accumulation unit 124 to the message transmission / reception server 38. The person-in-charge information storage unit 126 has a function of associating and holding a user name and information (email address or the like) of a person in charge in charge of the user. FIG. 3C shows an example of the information.

  Each of the facility monitoring apparatus 10 and the information analysis apparatus 12 can be realized by a program that executes processing described in this embodiment on a general computer having a CPU, a storage device, an input / output device, a communication device, and the like. . The facility monitoring apparatus 10 and the information analysis apparatus 12 are collectively referred to as a line bandwidth determination system. In addition, the equipment monitoring apparatus 10 and the information analysis apparatus 12 may be configured by one computer, but in that case, the computer can also be referred to as a line bandwidth determination system.

(System operation)
Next, the operation of the system shown in FIG. 2 will be described with reference to the flowchart of FIG. In the example described below, the line 30 between the router 20 and the router 24 is taken as an example. Note that the control of the processing shown in the flowchart of FIG.

  First, the loopback test management unit 101 of the equipment monitoring apparatus 10 designates the IP address of the router 24 acquired from the equipment information database 104 based on the line number of the target line 30 and performs a packet loopback test on the router 20. The router 20 performs a packet loopback test on the router 24 (step S1). Instead of executing the packet loopback test based on the instruction of the equipment monitoring device 10, the router 20 automatically uses the IP address of the router 24 held as routing information by the router 20 at regular time intervals, for example. Alternatively, a packet loopback test may be performed on the router 24.

  The result of the packet loopback test is transmitted from the router 20 to the equipment monitoring apparatus 10, and the loopback test management unit 101 of the equipment monitoring apparatus 10 displays the result of the packet loopback test as the IP address of the router 24, the test execution date, and the time. (Date and time are hereinafter referred to as “date and time”) and stored. An example of information held by the loopback test management unit 101 is shown in FIG.

  When the packet return test result is NG (NG in step S2), the equipment monitoring apparatus 10 checks the equipment state and holds the result (step S3). More specifically, for example, the equipment state management unit 102 specifies the line side interface unit for the router 24 in the router 20 from the line number of the target line, and is stored in the interface unit or stored in the router 20 To acquire the equipment state inspection result information of the interface unit. In addition, the data regarding an equipment state may be acquired, and the equipment monitoring apparatus 10 may be made to inspect the data. Then, the equipment state management unit 102 records the result of the equipment state inspection in association with the IP address of the router 24 and the date and time when the inspection was performed (the same as the packet return test in step S1). An example of information held by the equipment state management unit 102 is shown in FIG.

  Subsequently, the information management unit 103 acquires a line number from the facility information database 104 based on the common IP address of interest in the loopback test management unit 101 and the facility state management unit 102, and based on the line number, A user name is acquired from the information database 105 (step S4). The information management unit 103 associates the user name, the line number, and the date with the packet return test result information held by the return test management unit 101 and the equipment state inspection result information held by the equipment state management unit 102. Is stored in the user equipment information storage unit 121 in the information analysis device 12 (step S5). An example of information stored in the user facility information storage unit 121 is shown in FIG.

  In step S2, if the packet return test result is OK, the equipment state inspection result information is not acquired for the line, and the equipment state inspection result is not recorded in the user equipment information storage unit 121 (FIG. In (c), “-” is entered).

  The processing from step S1 to step S5 is performed at predetermined time intervals (for example, at intervals of 5 minutes) for each line for each user as necessary. By performing such repetitive processing, as shown in FIG. 5C, the user equipment information storage unit 121 sequentially stores records of test results in the order in which the packet return test is performed. Become.

  Subsequently, based on the information stored in the user equipment information storage unit 121, it is determined whether the bandwidth of the line is insufficient.

  The information determination unit 122 of the information analysis device 12 extracts the information of the user equipment information storage unit 121 on a line basis, and determines the lack of bandwidth based on the principle of bandwidth shortage determination described above for each line information. Do. That is, if the packet return test result is NG and the equipment state inspection result is OK, it is determined that the bandwidth of the target line is insufficient at the date and time corresponding to the information ((A) of step S6). If the packet return test result is OK, it is determined that there is no problem (step (b) in step S6). If both the packet loopback test result and the equipment condition inspection result are NG, it is determined that the router itself or the line is out of order (step S6 (c)), for example, the maintenance department sends the electronic information via the analysis information distribution network 16 Contact by email. If the purpose is only to determine the lack of bandwidth, the process does not have to be performed in cases other than (a) of step S6. Also, it is not possible that the packet return test result is OK and the equipment state inspection result is NG (the line is disconnected but there is a packet return response). The determination result here is stored in the storage device in the format shown in FIG. 5D, for example (step S7). Note that the determination by the information determination unit 122 may be performed immediately before data is stored in the user facility information storage unit 121 from the information management unit 103.

  Subsequently, the information analysis unit 123 in the information analysis device 12 aggregates the lines determined to be insufficient in bandwidth. There are various methods for counting, but an example will be described below.

  Based on the determination result stored in the storage device, the information analysis unit 123 counts the number of times of bandwidth shortage per line, by day, by month, and by time period, and stores it in the analysis information storage unit 124 (step S8). . Examples of results obtained by such a counting method are shown in FIGS. 6 (a) and 6 (b). FIGS. 6A and 6B show an example in which information of the user information database 105 is added.

  In addition, the information analysis unit 123 counts the number of times the user's line is unpredictable for each user by day, month, and time period, and accumulates the result in the analysis information accumulation unit 124 (step S9). . FIG. 7A and FIG. 7B show examples of information in that case. FIGS. 7A and 7B show results in units of network numbers of a network composed of a plurality of lines, and show an example in which the average number of times between lines is obtained and recorded.

  In addition to the above example, the time span from the occurrence of an insufficient bandwidth event until the packet return test result OK and the equipment state inspection result OK may be recorded in units of users. Further, the time width from the occurrence of the event of insufficient bandwidth to the recovery of the event and the occurrence of the event may be recorded.

  After step S9, the information transmission unit 125 of the information analysis apparatus 12 extracts the user name from the analysis information storage unit 124, searches the person-in-charge information storage unit 126 using the user name, and handles the user. The mail address of the person in charge is specified (step S10). Then, the information transmission unit 125 creates a message based on the mail address of the person in charge obtained in step S10 and the total information corresponding to the user name, and sends the message to the message transmission / reception server 38 of the analysis information distribution network 16. A message is transmitted (step S11). The person in charge corresponding to the mail address acquires a message addressed to the user from the message transmission / reception server 38 of the analysis information distribution network 16 from the message receiving terminal (step S12), and uses the information to increase the speed of the user line. Implement proposals and other activities. Note that the timing of notifying the person in charge by e-mail can be set as appropriate, for example, every 10 minutes, every day, every month.

(Other examples of aggregation methods)
In the above-described bandwidth shortage determination method of the present embodiment, a plurality of data indicating that the line is short of bandwidth at a certain time is totaled, and the totaled result is provided to the person in charge of the line. In this case, the person in charge of the line determines how to take action by looking at the total result. For example, if there is a shortage of bandwidth more than a certain number of times within a certain period, a line extension is proposed to the user.

  Such a determination may be made on the information analyzer 16 side. For example, based on the monthly totals, if there is a bandwidth shortage status for a line more than 100 times in the month, information indicating that the line should be expanded should be output to the person in charge. To be notified. Alternatively, the user may be notified directly by e-mail. Also, notification based on the fluctuation rate of the number of insufficient bandwidths can be performed, for example, when the number of insufficient bandwidths on a certain day is twice or more the number of insufficient bandwidths on the previous day, using the result of counting by day.

  For example, the threshold for determining when to add or remove the line is investigated, for example, the actual value of the total result and the user's feeling of use of the line in the period corresponding to the actual value Can be determined. In addition, depending on the application used by the user, it is necessary to avoid a minor shortage of bandwidth, and conversely, there may be no problem unless there is a particularly noticeable bandwidth shortage, so the threshold should be determined for each user. Is preferred.

(Example when the router has multiple stages)
In the configuration example shown in FIG. 2, the case where there is no other router between the routers at both ends, such as between the router 20 and the router 24, is shown. However, as in the configuration shown in FIG. Even when there is another router between the routers at both ends, that is, when the router has multiple stages, the bandwidth shortage determination method based on the principle described first can be applied. The method will be described with reference to the flowchart of FIG. 9 taking the case of FIG. 8A including one router between the routers at both ends as an example. In the following procedure, the line bandwidth determination system (system having functions of the equipment monitoring device 10 and the information analysis device 12) issues a packet return test command to each router, obtains a result, requests equipment status inspection to each router, It is executed by judgment and control by the line bandwidth judgment system while executing the result acquisition. In addition, the line bandwidth determination system holds facility information for each router and each line. The following procedure shows a procedure that focuses on the process of determining whether or not the target line has insufficient bandwidth.

  First, the router C performs a packet return test on the router A (step S21). If the test result is OK (OK in step S22), it can be determined that there is no problem such as insufficient bandwidth in the line L2 and the line L1. In the case of NG in step S22, there may be a case where one or both of the line L2 and the line L1 is insufficient in bandwidth, or the equipment related to any line is out of order. In order to narrow down one of these various causes, a packet loopback test is performed from router B to router A in step S23. If the result is OK (OK in step S24), it is considered that either the bandwidth of the line L2 is insufficient or the equipment is faulty. Therefore, the equipment state on the line L2 side of the router C is checked (step S25), and the result Is OK (OK in step S26), it is determined that the bandwidth of the line L2 is insufficient (step S27). Further, if the result is NG (NG in step S26), it can be determined that the line L2 is out of order.

  If the result is NG in step S24 (NG in step S24), a packet return test from router C to router B is performed (step S28). If the result is OK (OK in step S29), the router The equipment state on the line L1 side of B is checked (step S30), and if the result is OK (OK in step S31), it can be determined that the bandwidth of the line L1 is insufficient. If it is NG in step S31, it can be determined that the line L1 has failed or the like.

  If it is NG in step S29, the equipment status is confirmed on the line L2 side of router C and on the line L1 side of router B (step S33), and if both results are OK (both OK in step S34), line L2 And the line L1 are determined to have insufficient bandwidth (step S35). If one result is OK, it can be determined that the line corresponding to the OK side is insufficient in bandwidth (step S36). If both are NG, it is considered that there is equipment failure in the line L2 and the line L1. Instead of the above procedure, when the first packet loopback test is NG, a procedure for first confirming the equipment state of each router may be used.

  In the procedure example of FIG. 9, the packet return test is basically performed in the order shown in FIG. 8B to narrow down the sections. However, the sections may be narrowed down in the order shown in FIG. Also, the packet return test can be performed in the order as shown in FIG. In the case of FIG. 8D, when the first packet return test is NG, the determination for the line L2 and the line L1 may be performed by the method described in FIG.

  In the above example, the case where one other router is included between the routers at both ends has been described as an example. However, even when more routers are included, it is possible to narrow down the lines similarly. is there. Even when many routers are included, a packet loopback test is first performed from the end router to the end router, and a narrowing test is performed only when it is not OK.

  The present invention is not limited to the above-described embodiment, and various modifications and applications can be made within the scope of the claims.

  In the above-described embodiment, a network constituted by routers is taken as an example. However, the present invention is applicable to a network constituted by devices other than routers as long as it is a network that communicates IP packets. In the above embodiment, the case where the facility monitoring device 10 and the information analysis device 12 perform the bandwidth shortage determination has been described. However, a program for performing the bandwidth shortage determination based on the bandwidth shortage determination principle described first may be a router or the like. The communication device itself may determine whether the bandwidth is insufficient and notify the monitoring device or the like of the result.

It is a block diagram for demonstrating the principle of a band shortage determination. It is a system configuration figure in an embodiment of the invention. It is a figure which shows the information accumulate | stored in each database. It is a flowchart which shows operation | movement of the system in embodiment of this invention. It is a figure which shows the information which the loopback test management part 101 and the equipment state management part 102 hold | maintain. It is a figure which shows the total result of a line unit. It is a figure which shows the total result of a user unit. It is a block diagram for demonstrating the band determination process in case a router is multistage. It is a flowchart of the zone | band determination process in case a router is multistage.

Explanation of symbols

1, 2, 18, 20, 22, 24, 26, 28, A, B, C Router 3, 30, 32, 34, 36, 33, 35, L1, L2 Line 10 Facility monitoring device 12 Information analysis device 14 Data Communication network 16 Analysis information distribution network 38 Message transmission / reception server 40, 42 Message receiving terminal 101 Loopback test management unit 102 Equipment state management unit 103 Information management unit 104 Equipment information database 105 User information database 121 User equipment information storage unit 122 Information determination unit 123 Information analysis unit 124 Analysis information storage unit 125 Information transmission unit 126 Person in charge information storage unit

Claims (15)

A line bandwidth determination system having a function of determining whether or not the bandwidth of a line between communication devices constituting a data communication network is insufficient,
Data return test result acquisition means for acquiring a data return test result for the second communication device from the first communication device;
Facility state information acquisition means for acquiring facility state information related to a line connecting the first communication device and the second communication device;
Determining means for determining that the bandwidth of the line connecting the first communication device and the second communication device is insufficient when the data loopback test result is not good and the equipment state is good; ,
When the data loopback test result acquisition unit acquires the data loopback test result from the communication device corresponding to one line, and the acquired data loopback test result is not good, the facility status information acquisition unit causes the facility status information A process for acquiring information from the communication device is executed for a plurality of lines in the data communication network, and for each line, the data loopback test result and the equipment status information are stored in association with the data loopback test time. Means for storing in the device;
A system for determining line bandwidth.   The line bandwidth determination system according to claim 1, wherein the facility state information includes information indicating a state of a data link layer of communication in the line, which is collected in a first communication device.   2. The line bandwidth determination system according to claim 1, wherein the data loopback test is a test in which an IP packet is looped back using an ICMP (Internet Control Message Protocol) echo request and echo response. The determination means performs a bandwidth shortage determination for each line based on information stored in the storage device, and totals the number of occurrences of the bandwidth shortage in the line determined to be insufficient by the determination means for each predetermined period. 4. The line bandwidth determination system according to claim 1, further comprising a summing unit that performs counting. 5. The line bandwidth determination according to claim 4 , wherein the line bandwidth determination system includes a database that stores a line and a user name in association with each other, and the aggregation unit performs aggregation for each user based on information in the database. system. An output unit that outputs information indicating that the line is insufficient in bandwidth when the number of occurrences of insufficient bandwidth within a predetermined period for a specific line exceeds a predetermined threshold based on the result of the aggregation. Item 5. Band bandwidth determination system according to item 4 . The line bandwidth determination system according to claim 6 , wherein the output unit acquires a mail address of a person in charge related to the line and transmits the information to the mail address by electronic mail. A program for causing a computer to realize a function for determining whether or not a bandwidth of a line between communication devices constituting a data communication network is insufficient, the computer comprising:
Data return test result acquisition means for acquiring a data return test result for the second communication device from the first communication device;
Facility state information acquisition means for acquiring facility state information related to a line connecting the first communication device and the second communication device;
A determination unit that determines that a bandwidth of a line connecting the first communication device and the second communication device is insufficient when the data loopback test result is not good and the equipment state is good;
When the data loopback test result acquisition unit acquires the data loopback test result from the communication device corresponding to one line, and the acquired data loopback test result is not good, the facility status information acquisition unit causes the facility status information The process of acquiring information from the communication device is executed for a plurality of lines in the data communication network, and for each line, the data loopback test result and the equipment status information are associated with the data loopback test time, Means for storing in a storage device of the computer;
A program characterized by functioning as The determination means performs a bandwidth shortage determination for each line based on information stored in the storage device,
  9. The program according to claim 8, wherein the program causes the computer to function as an aggregation unit that aggregates the number of occurrences of insufficient bandwidth in a line determined to be insufficient by the determination unit for each predetermined period. Program. The program according to claim 9, wherein the computer has a database that stores a line and a user name in association with each other, and the aggregation unit performs aggregation for each user based on information in the database . The program, when the number of occurrences of insufficient bandwidth within a predetermined period for a specific line exceeds a predetermined threshold based on the result of the aggregation, the program indicates that the line is insufficient in bandwidth. The program according to claim 9, wherein the program is made to function as an output unit that outputs .   Line bandwidth determination system for determining whether or not the bandwidth of a line between communication devices constituting a data communication network is insufficientButExecutionDoA method for determining a line bandwidth,
  The line bandwidth determination system includes:
Data wrap test result acquisition for acquiring a data wrap test result for the second communication device from the first communication devicemeansWhen,
Facility status information acquisition for acquiring facility status information related to the line connecting the first communication device and the second communication devicemeansWhen,
Determining that the bandwidth of the line connecting the first communication device and the second communication device is insufficient when the data loopback test result is not good and the equipment state is goodmeansWhen,The line bandwidth determination method comprises:
  When the line bandwidth determination system causes the data loopback test result acquisition means to acquire a data loopback test result from a communication device corresponding to one line, and the acquired data loopback test result is not good, the equipment state information A process for causing the acquisition means to acquire the equipment state information from the communication device is executed for a plurality of lines in the data communication network, and the data return test result and the equipment state information are returned for each line. Storing in a storage device in association with the test time;
  The line bandwidth determination system performs a bandwidth shortage determination for each line based on information stored in the storage device by the determination unit;
  A circuit bandwidth determination method characterized by comprising: 13. The line bandwidth determination method according to claim 12, further comprising a counting step of counting the number of occurrences of insufficient bandwidth in the line determined to be insufficient by the determination means for each predetermined period. The line bandwidth determination system includes a database that stores a line and a user name in association with each other, and in the counting step, the line bandwidth determination system performs counting for each user based on information in the database. 14. The line bandwidth determination method according to 13. Based on the result of the aggregation, the line bandwidth determination system, when the number of occurrences of insufficient bandwidth within a predetermined period for a specific line exceeds a predetermined threshold, information indicating that the line is insufficient The line bandwidth determination method according to claim 13, further comprising an output step of outputting.

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