JP3362003B2 - Delay / throughput evaluation method and network management device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a delay / throughput evaluation method used for evaluation of delay / throughput in a communication system for message transfer, and a network management apparatus for implementing this method.

[0002]

2. Description of the Related Art How long it takes to deliver a certain amount of data to a certain place is one of the main quality evaluation items in a communication system. To estimate this time, the following two methods can be considered depending on the communication mode.

(1) In a communication mode in which one communication occupies network resources such as circuit switching, for example, 64
It is known what the transfer rate of communication is, such as kbps (kilobits per second). Therefore, it can be estimated from this transfer rate value that it takes about 1 second to send, for example, 64 kilobits of data.

(2) In a network represented by the Internet that shares network resources and does not guarantee quality such as transfer rate, a tool called ping is used, for example. These tools measure short times by sending and receiving short messages to and from a particular destination.

[0005]

SUMMARY OF THE INVENTION As described above, (1)
However, this method has a restriction that it cannot be applied to a mode in which network resources are shared. Although such a constraint can be solved by using the method (2), p used in this method
Tools such as ing have a disadvantage that the relationship between the amount of transmitted data and the delay cannot be obtained.

The present invention has been made in view of the above points, and it is an object of the present invention to evaluate delay / throughput in a network sharing network resources without using tools such as ping. Moreover, it is an object of the present invention to provide a delay / throughput evaluation method that can clarify the relationship between the amount of transmission data and the delay that cannot be evaluated by ping or the like, and a network management device for implementing this method.

[0007]

In order to solve the above problems, the invention according to claim 1 provides a delay / throughput evaluation method in a network provided with a network device having management information for network management. Therefore, every time the network management device that manages the network acquires the management information from the network device, the network management device measures the time required to acquire the management information and obtains the acquired data amount of the management information. The fixed delay and the throughput of the network are calculated by analyzing the relationship between the required time and the acquired data amount that are stored together with the required time. The invention according to claim 2 is the invention according to claim 1, wherein the fixed delay and the throughput are obtained from a regression line obtained by a regression analysis using the acquired data amount as an explanatory variable and the required time as an explained variable. The feature is that it is calculated.

According to a third aspect of the invention, in the network management device for managing the network by acquiring the management information from a network provided with a network device having management information for network management, A storage unit that stores a time required to acquire the management information and an amount of data acquired from the management information, and a time required to calculate the time required to acquire the management information from the network device. When obtaining the management information from the calculating means and the network device,
A data amount calculation means for calculating the acquired data amount, a storage means for storing the calculated required time and the acquired data amount in the storage means, and a required time stored in the storage means, It is characterized by comprising an analysis means for analyzing a relationship between the acquired data amounts and calculating a fixed delay and throughput of the network. Further, in the invention according to claim 4, in the invention according to claim 3, the analysis means fixes the fixed value from a regression line obtained by a regression analysis using the acquired data amount as an explanatory variable and the required time as an explained variable. It is characterized in that the delay and the throughput are calculated.

[0009]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a network to which the delay / throughput evaluation method according to the present embodiment is applied. Network devices 101 to 103 having data and files for network management are provided in the network shown in FIG. Here, the network device 101 and the network device 102, and the network device 101 and the network device 103 are connected by lines 105 and 106, respectively.

On the other hand, the network management device 104 is a network device 101 to 10 constituting a network.
A device for managing the third and the like, which are lines 107 to 10
The management information is acquired from the network devices 101 to 103 via the server 9. The network management device 104 is adapted to acquire management information periodically or when an event occurs. Note that the management information referred to here is configuration information, failure information, performance information, etc., and SNMP (Simple Network Monitori) is used to acquire these information.
ng Protocol), ftp (file transfer protocol),
A communication protocol such as telnet (telecommunication network) is used.

The network management device 104 includes a CPU
It has a (central processing unit) 110 and a clock 111. Inside the CPU 110, a table 112 shown in FIG. 2 is stored, and a work register 113 is provided. As shown in the figure, in the table 112, each row (table entry) is composed of items of data number, target device address, execution time, acquisition means, required time, and acquired data amount, and each time these pieces of information are acquired. A line with a new data number is created at. Table 11
The contents of each item constituting item 2 will be clarified in the following operation description.

Next, the procedure of delay / throughput evaluation in the above-mentioned network configuration will be described with reference to the flow charts of FIGS. First, the network management device 104 reads the current time from the clock 111 inside the device at the time when it becomes necessary to acquire the management information described above, and stores it in the register 113 (step S1). Next, the network management device 104 uses the SNM.
After obtaining necessary information such as configuration information from the network devices 101 to 103 by the method such as P (step S2), the time is read again from the clock 111 (step S).
3). Next, the network management device 104 calculates the time required to acquire the management information from the difference between the time stored in the register 113 in step S1 and the time just acquired (step S3) (step S4).

Next, the network management device 104 creates a row with a new data number in the table 112, and the address (address of the target device shown in FIG. 2) assigned to the network device that has acquired the management information. ), Time of information acquisition stored in register 113 in step S1 (execution time shown in FIG. 2), communication protocol used for information acquisition (acquisition means shown in FIG. 2), required time calculated in step S4, and management The amount of information acquisition data is added to the row of the table 112 just created.

According to the example shown in FIG. 2, a row of data number "1" is first created, and the address of the network device 101 is set as the target device address and "1" as the execution time.
0:59:02 ”, SNMP as acquisition means, required time“ 3.00 ”seconds, acquired data amount“ 251 ”
The bytes are stored in the same row. Further, at the time of information acquisition that follows, a line with data number "2" is created, the address of the network device 102 as the target device address, "11:27:11" as the execution time, and F as the acquisition means.
TP (ftp), required time "7.00" seconds, and acquired data amount "2433" bytes are stored in the same row (above, step S5).

After this, the network management device 104
By repeating the processing of steps S1 to S5,
Delay when the amount of data is accumulated in the table 112
Perform throughput evaluation. First, the network management device
Reference numeral 104 denotes the target network device that has acquired the management information.
Delay / throughput characteristics based on location, acquisition method, etc.
Are considered to be similar. That is,
For this classification, do the line for each destination (network device)
It is possible to say something like this (the above is step S6). here
And the number of classified data rows is N (N is a natural number)
And obtained for data number 1 to data number N
Data volume and required time are data volume x _i， Time required
y_iPut (i = 1, 2, ..., N).

Next, the network management device 104 obtains a regression curve existing between the data amount x _i and the required time y _i by using the well-known least squares method (see FIG. 5). that time,
The network management device 104 performs linear regression with the acquired data amount x as an explanatory variable and the required time y as an explained variable. Note that in FIG. 5, only four data are shown for convenience of explanation (above, step S7). Since the regression line y = ax + b is obtained by this regression analysis, the network management device 104 fixes the value “a” of the slope of the straight line and the value “b” of the required time y corresponding to the data amount x of “0”. Decide on a delay. And
The network management device 104 displays the obtained throughput and fixed delay value on the management screen provided in the device (above, step S8).

As described above, in this embodiment, when data or files are acquired from the network device using SNMP or ftp to acquire the management information, the time required for this communication is measured and acquired. It is stored together with the amount of data and the destination (address of the target device). Then, when a predetermined amount of data is accumulated, a regression line is applied to the acquired data amount and required time for the same destination etc. to obtain the delay (transmission required time) characteristic, and the fixed delay and throughput are obtained from it. There is.

[0018]

As described above, according to the present invention, each time the network management device acquires management information from the network device, the time required for information acquisition is measured and the amount of acquired data is calculated to obtain the required time. The fixed delay and the throughput of the network are calculated by analyzing the relationship between the required time and the amount of acquired data that are stored. Accordingly, it is possible to estimate the fixed delay and the throughput by acquiring the data regarding the delay / throughput in accordance with the acquisition of the management information necessary for network management. Therefore, it is possible to evaluate the delay / throughput even in a network mode in which network resources are shared, and it is possible to achieve the purpose of obtaining the relationship between the amount of transmission data and the delay that cannot be evaluated by a tool such as ping.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a network to which a delay / throughput evaluation method according to an embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram showing a configuration of a table 112 provided in a CPU 110 in the network management device 104 that constitutes the network shown in FIG.

FIG. 3 is a table 1 shown in FIG. 2 in the same embodiment.
12 is a flowchart showing a procedure for creating each table entry in 12.

FIG. 4 is a flowchart showing a procedure of a delay / throughput evaluation method according to the same embodiment.

FIG. 5 shows the throughput a and fixed delay b in the same method using regression analysis for the amount of acquired data and required time.
7 is a graph showing how to calculate.

[Explanation of symbols]

101-103 network device 104 network management device 105-109 lines 110 CPU 111 clock 112 tables 113 registers

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 29/14 G06F 13/00 351 H04L 12/24 H04L 12/26 H04L 12/28

Claims (4)

(57) [Claims] 1. A delay / throughput evaluation method in a network provided with a network device having management information for network management, wherein the network management device managing the network comprises: Each time it acquires, while measuring the time required to acquire the management information,
Obtaining the amount of acquired data of the management information and storing it together with the required time, and calculating a fixed delay and throughput of the network by analyzing a relationship between the stored required time and the stored amount of acquired data. Characteristic delay / throughput evaluation method. 2. The delay according to claim 1, wherein the fixed delay and the throughput are calculated from a regression line obtained by a regression analysis using the acquired data amount as an explanatory variable and the required time as an explained variable. -Throughput evaluation method. 3. A network management device that manages the network by acquiring the management information from a network provided with a network device having management information for network management. Storage means for storing the required time and the amount of acquired data of the management information, required time calculating means for calculating the required time when acquiring the management information from the network device, and the network device A data amount calculating means for calculating the acquired data amount when acquiring the management information; a storage means for storing the calculated required time and the acquired data amount in the storage means as a set; The relationship between the required time and the amount of acquired data stored in the means is analyzed to analyze the fixed delay and the delay of the network. Network management apparatus characterized by comprising an analyzing means for calculating a put. 4. The analysis means calculates the fixed delay and the throughput from a regression line obtained by a regression analysis using the acquired data amount as an explanatory variable and the required time as an explained variable. Item 3. The network management device according to item 3.