JPH10200546A - LAN load control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a LAN load controller in which loads of all LAN lines are uniformized in a multi-line LAN having more than or equal to two lines and wrong data transmission error is eliminated. SOLUTION: Presence of an abnormal occurrence in a LAN line 2 is diagnosed by a LAN line state diagnostic processing means 9, a load value of the LAN line 2 is measured by a LAN load measurement processing means 10, and the diagnostic result of the LAN line 2 and the load value of the LAN line 2 are stored in a line state file 11. Then a transmission processing means 8 selects a normal LAN line 2 with the smallest load value based on the load value of the LAM line 2 and based on the diagnosed result of the LAM line 2 stored in the line state file 11 the data is transmitted to the selected line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a LAN in a data transmission / reception system in which a plurality of computers are connected in a network environment composed of a multi-line LAN of two or more lines, and data are mutually transmitted and received between these computers. The present invention relates to a load control device.

[0002]

2. Description of the Related Art In general, a data transmission / reception system in which a plurality of computers are connected in a network environment constituted by a multi-line LAN of two or more lines and data is transmitted / received between these computers as shown in FIG. Is configured.

That is, the multi-line LAN 1 is connected to the first LA
The multi-line LAN 1 is connected to a plurality of first computers 3a to n-th computers 3n. Then, data is transmitted and received between the first computer 3a to the n-th computer 3n. That is, data transmitted from any one of the first computer 3a to the n-th computer 3n is transmitted to the first LAN
Data is transferred to another computer through one of the line 2a to the m-th LAN line 2m, and the load of the LAN is controlled in each of the computers 3a to 3n.

FIG. 17 is a block diagram of the LAN load control device 4 formed inside each of the computers 3a to 3n. In FIG. 17, the LAN line is the first LAN line 2a.
2 and a second LAN line 2B. The LAN load control device 4 includes a transmission request application group 5, and the transmission request application group 5 includes a first application 6a to a k-th application 6k. The transmission data from the transmission request application group 5 is input to the transmission processing means 8 via the transmission request queue 7, and the transmission processing means 8 is connected to the pre-selected first LAN line 31 or second LAN line 31. The data is transmitted to any one of T.32.

That is, in the conventional LAN load control device 4 shown in FIG. 17, the first LAN line 2a or the second L
Data transmission is fixedly performed to one of the LAN lines 2 selected from the AN lines 2b. Then, when the LAN line 2 to which the transmission processing means 8 performs data transmission fails, the failure is recovered by switching the LAN line 2 from a system console or the like.

As described above, the conventional LAN load control device 4
Is a method in which data transmission is fixedly performed to a LAN line 2 designated in advance, and when the LAN line 2 fails, an operator switches to another LAN line 2 from a system console or the like to perform data transmission.

[0007]

However, in such a conventional LAN load control device 4, a fixedly used L is used.
Since the AN line 2 is defined, one LAN line 2
The load may be concentrated on the network, which may cause a delay in data transmission. In addition, when the LAN line 2 fails, a problem such as data loss occurs, and the reliability is low. That is, the load on the specific LAN line 2 tends to increase, and the reliability of data transmission must be reduced.

As described above, in the related art, since one of the LAN lines 2 is used in a fixed manner, when the amount of transmission data is enormous or when transmission requests occur frequently, the LAN line 2 and the computer 2 ( Data transmission in the LAN load control device 4) is congested, which not only reduces the efficiency of data transmission, but also causes the system to stop functioning. Further, a data transmission failure occurs when an abnormality occurs in the LAN line 2.

An object of the present invention is to provide a multi-line LA having two or more lines.
It is an object of the present invention to provide a LAN load control device capable of equalizing loads of all LAN lines in N and eliminating data transmission failure.

[0010]

According to a first aspect of the present invention, there is provided a LAN load control device for diagnosing the presence or absence of an abnormality in a LAN line, and a LAN load measuring device for measuring a load value of the LAN line. A measurement processing means, a line status file storing the load value of the LAN line and the diagnosis result of the LAN line, and a normal and load value based on the load value of the LAN line and the diagnosis result of the LAN line stored in the line status file Transmission processing means for selecting the LAN line with the smallest number and transmitting the data.

In the LAN load control device according to the first aspect of the present invention, the presence or absence of an abnormality in the LAN line is diagnosed by the LAN line state diagnosis processing means, and the load value of the LAN line is measured by the LAN load measurement processing means. Line diagnosis result and L
The load value of the AN line is stored in the line state file. Then, the transmission processing means stores the LA stored in the line status file.
Based on the load value of the N line and the diagnosis result of the LAN line, a normal LAN line having the smallest load value is selected and data is transmitted.

According to a second aspect of the present invention, there is provided a LAN load control device for measuring a load value of a LAN line, and a LAN load measuring device for measuring the load value of the LAN line.
A line status file for storing line load values, a LAN load upper limit file for pre-stored LAN line load upper limit values, and data transmission stop permission for specifying and storing low-priority data in advance based on the type of data An information file,
When the load value of the LAN line is equal to or more than the load upper limit value and the data to be transmitted matches the data stored in the data transmission suspension permission information file, the transmission processing means for suspending the transmission of the data is provided. is there.

In the LAN load control device according to the second aspect of the present invention, the load value of the LAN line is measured by the LAN load measurement processing means and stored in the line state file. When the transmission processing means determines that the load value of the LAN line stored in the line status file is equal to or greater than the load upper limit value stored in the LAN load upper limit file, the data to be transmitted is data transmission stop permission information. It is determined whether or not the data matches the data stored in the file. If the data matches, the transmission of the data is stopped. As a result, when the load on the LAN line is equal to or greater than the load upper limit value, transmission of low priority data is stopped.

According to a third aspect of the present invention, there is provided a LAN load control device, comprising: a LAN load measurement processing means for measuring a load value of a LAN line;
A line status file for storing the line load value, a light load transmission data file in which data to be transmitted when the LAN line is lightly loaded is specified and stored, and whether or not the LAN line is lightly loaded A LAN load lower limit file storing the LAN line load lower limit value for determining whether the data is to be transmitted, and if the data to be transmitted is data stored in the light load transmission data file, the data is stored in the LAN load lower limit file. Light load transmission processing means for selecting a LAN line having a load less than the lower load limit and transmitting the data, and light load transmission when the data to be transmitted is data stored in a light load transmission data file When the processing means is not likely to be activated, the LAN line having the smallest load value is selected based on the load value of the LAN line stored in the line state file, and the data is selected. It is obtained by a transmission processing unit for signal for.

In the LAN load control device according to the third aspect of the present invention, the load value of the LAN line measured by the LAN load measurement processing means is stored in a line state file. Then, the transmission processing means determines whether or not the data to be transmitted is the data stored in the light load transmission data file, and if so, activates the light load transmission processing means. The light load transmission processing means selects a LAN line less than the load lower limit value stored in the LAN load lower limit file and transmits the data. On the other hand, if the data to be transmitted is not the data stored in the light load transmission data file, the LAN line with the smallest load value is selected based on the load value of the LAN line stored in the line status file, and the data is transmitted. Send

According to a fourth aspect of the present invention, there is provided a LAN load control device for measuring a load value of a LAN line, and a LAN load measuring device for measuring the load value of the LAN line.
A line status file for storing the load value of the line, and an L in which a load upper limit value and a predetermined load lower limit value for the LAN line are stored in advance.
An AN load upper / lower limit file and a load lower limit value stored in the LAN load upper / lower limit value file after a certain time delay when the load value of all LAN lines is equal to or greater than the load upper limit value stored in the LAN load upper / lower limit value file. A light load transmission processing means for selecting a LAN line less than and transmitting data, and a light load transmission process when the load value of all LAN lines is equal to or more than the load upper limit value stored in the LAN load upper / lower limit value file When the means is not likely to be activated, the L value having the smallest load value is determined based on the load value of the LAN line stored in the line state file.
Transmission processing means for selecting an AN line and transmitting data.

In the LAN load control device according to the fourth aspect of the present invention, the load value of the LAN line measured by the LAN load measurement processing means is stored in a line state file. Then, the transmission processing means determines whether or not the load values of all the LAN lines are equal to or greater than the load upper limit value stored in the LAN load upper / lower limit value file. to start. The light-load-time transmission processing means selects a LAN line having a load lower than the lower limit value stored in the LAN load upper / lower limit value file after a predetermined time delay and transmits data. On the other hand, when the load values of all the LAN lines are not equal to or greater than the load upper limit value stored in the LAN load upper / lower limit value file, the LAN line having the smallest load value is determined based on the load value of the LAN line stored in the line state file. Select to send the data.

According to a fifth aspect of the present invention, there is provided a LAN load control apparatus according to the fourth aspect, wherein
A LAN line state diagnosis processing means for diagnosing the occurrence of a line abnormality is additionally provided.
If data transmission is not possible from the line, the transmission processing means temporarily suspends data transmission and activates the light load transmission processing means. The light load transmission processing means determines that the LAN line is normal and the load value is the LAN load upper / lower limit value. The data transmission is restarted when the load becomes lower than the load lower limit value stored in the file.

According to a fifth aspect of the present invention, in addition to the operation of the fourth aspect of the present invention,
If an abnormality of the LAN line is detected by the LAN line state diagnosis processing means and data cannot be transmitted from the LAN line, the transmission processing means interrupts the temporary data transmission and activates the light load transmission processing means. The light load transmission processing means selects a LAN line whose LAN line is normal and whose load value is less than the load lower limit value stored in the LAN load upper / lower limit value file, and restarts data transmission.

According to a sixth aspect of the present invention, there is provided a LAN load control device, comprising: a LAN load measuring means for measuring a load value of a LAN line; and a LAN measured by the LAN load measuring means.
A line status file that stores the load value of the line, a LAN load upper limit file that stores the load upper limit value of the LAN line in advance, and a load that calculates a time moving average of the load value of the LAN line that is stored in the line status file Value time moving average processing means and LA calculated by the load value time moving average processing means.
A load value time moving average value file storing the load value time moving average value of the N lines and a LAN line having the smallest load value time moving average value of the LAN line stored in the load value time moving average value file are selected. Transmission processing means for transmitting data.

In the LAN load control device according to the invention, the load value of the LAN line measured by the LAN load measurement processing means is stored in the line state file. Further, the load value time moving average processing means calculates a time moving average value of the load value of the LAN line stored in the line state file and stores it in the load value time moving average value file. Then, the transmission processing means outputs the L value stored in the load value time moving average value file.
The LAN line with the smallest load value time moving average value of the AN line is selected and data is transmitted.

[0022]

Embodiments of the present invention will be described below. FIG. 1 shows a LAN according to a first embodiment of the present invention.
FIG. 2 is a configuration diagram of a load control device 4. The first embodiment is different from the conventional example shown in FIG. 17 in that a LAN line state diagnosis processing means 9 for diagnosing the occurrence of an abnormality in the LAN line 2 includes:
A LAN load measurement processing unit 10 for measuring the load value of the LAN line 2 and a line state file 11 for storing the load value of the LAN line 2 and the diagnosis result of the LAN line 2 are additionally provided. Based on the load value of the LAN line 2 and the diagnosis result of the LAN line 2 stored in the line state file 11, the LAN line 2 which is normal and has the smallest load value is selected and data is transmitted. .

In FIG. 1, a transmission processing means 8 receives transmission data from a transmission request application group 5 via a transmission request queue 7 and transmits the data to the LAN line 2.
To determine. In determining the LAN line 2, L
This is performed based on the line state data created by the AN line state diagnosis processing means 9 and the LAN load measurement processing means 10, and the line state data is input from the line state file 11.

First, the transmission processing means 8 comprises the first applications 6 a to 6
Data is received from any of the k-th applications 6k via the transmission request queue 7. Next, the data transmission processing means 8 fetches the load value and the LAN line state for each LAN line 2 from the line state file 11 in order to determine the LAN line 2 to perform data transmission. LAN line status is LA
The load value of the LAN line 2 is detected by the N line state diagnosis processing means 9, measured by the LAN load measurement processing means 10, and taken into the line state file 11.

The LAN load measurement processing means 10 measures the LAN load state by extracting the number of packet collisions of each LAN line using an OS command, and stores the information in the line state file 11. Further, the LAN line state diagnosis processing means 9 receives the hello call from each of the LAN load control devices 4 (each of the computers 3) through each of the LAN lines 2, and judges that the LAN line 2 which cannot receive the hello call is out of order. The information is stored in the line status file 11. Then, the transmission processing means 8 outputs the line status file 11
A normal and low-load LAN line 2 is selected based on the data stored in the LAN, and the data is transmitted.

FIG. 2 shows a LAN according to the first embodiment.
5 is a flowchart showing the contents of calculations performed by the load control device 4. First, in step a1, transmission data from the transmission request application group 5 is taken out from the transmission request queue 7. Next, in step a2, the load MAX is set as the initial value in the previous LAN line load information used when comparing the load values of the respective LAN lines 2. In the following step a3, a loop is looped by the number of the LAN lines 2, and in that loop (steps a4 to a9), the LAN line state diagnostic processing means 9 and the LAN load measurement processing means 10 generate the LAN line 2 from the line state file 11 created by the LAN load measurement processing means 10. Each piece of information is extracted, and the LAN line 2 for which a transmission request is made is selected.

At step a4, the line status file 11
The state of the LAN line 2 is extracted from the next step a5.
To determine whether the LAN line 2 is normal or abnormal. If it is determined that the LAN line 2 is normal, the load value of the LAN line 2 is extracted from the line state file 11 in the subsequent step a6, and is compared with the previous LAN load information in the next step a7. If the load value of the LAN line 2 taken in this time is smaller than the previous value, the corresponding LAN line is selected as the transmission LAN line 2 in step a8 and step a
In 9 the LAN that was loaded this time into the LAN load information last time
The load value of the line 2 is held. In step a5, LA
If it is determined that the N line 2 is abnormal, the process returns to step a3 to perform the next LAN line 2 determination process.

Further, the previous LAN load information in step a7 is compared with the load value of the LAN line 2 taken in this time,
If the load value of the LAN line 2 fetched this time is equal to or greater than the previous value, the process immediately returns to step a3, fetches the information of the next LAN line 2 again, and continues the processing from step a4 to step a9. Thus, the loads of all normal LAN lines 2 are compared, and the normal LAN line 2 with the lightest load is selected as the transmission LAN line 2. In the following step al0, the data received via the transmission request queue 7 is transmitted from the LAN line 2 selected in step a8, and the process is terminated.

As described above, in the first embodiment, the LAN line 2 to be transmitted is assigned based on the measured load value of the LAN line 2 and the presence / absence of abnormality of the LAN line 2, and the load of the LAN line 2 is equalized. And eliminate data transmission failures. In other words, the failure of each LAN line 2 and the load on each LAN line 2 are monitored as needed, and the transmission LAN line 2 is automatically selected so that the load is evenly distributed to the normal LAN line 2. Delays and leaks can be prevented.

Next, a second embodiment of the present invention will be described. FIG. 3 is a configuration diagram of a LAN load control device according to the second embodiment of the present invention. In this second embodiment,
As compared with the conventional example shown in FIG. 17, a LAN load measurement processing means 10 for measuring the load value of the LAN line 2 and a line status file 11 for storing the load value of the LAN line 2 measured by the LAN load measurement processing means 10 A LAN load upper limit file 12 in which a load upper limit of the LAN line 2 is stored in advance,
A data transmission stop permission information file 13 in which low priority data is designated and stored in advance based on the type of data is additionally provided, and the transmission processing means 8 determines that the load value of the LAN line 2 is equal to or greater than the load upper limit value. When the data to be transmitted matches the data stored in the data transmission suspension permission information file 13, the transmission of the data is suspended. The setting of the upper limit value of the LAN line 2 in the LAN load upper limit file 12 and the designation of low priority data in the data transmission suspension permission information file 13 are set in advance by the input device 14.

In FIG. 3, the transmission processing means 8 receives transmission data from the transmission request application group 5 via the transmission request queue 7, and transmits information of the line status file 11 created by the LAN load measurement processing means 10 to the input device 14. That stores the upper limit of the load on the LAN line 2 input from the
Based on the N load upper limit file 12 and the data transmission suspension permission information file 13, the data to be transmitted and the LAN to be transmitted
Determine the line 2 and transmit the data.

First, the transmission processing means 8 includes the first applications 6 a to 6
Data is received from any of the k-th applications 6n via the transmission request queue 7. Next, the data transmission processing means 8 fetches a load measurement value for each LAN line 2 from the line state file 11 in order to determine a LAN line 2 to perform data transmission. The load measurement values in the line status file 11 are data created by the LAN load measurement processing means 10. The LAN load measurement processing means 10 measures the LAN load state by extracting the number of packet collisions of each LAN line 2 using an OS command, and stores the information in the line state file 11. Then, the transmission processing means 8 selects the LAN line 2 for data transmission based on the data in the line status file 11 and transmits the data.

In this case, when the load value of the selected LAN line 2 exceeds the load upper limit value of the LAN load upper limit file 12 set by the input device 14, it is determined whether or not transmission of the transmission data is to be stopped. Input device 1 to determine
Data transmission stop permission information file 13 set from 4
Of the data transmission stop permission information. As the data transmission stop permission information, information having a low data transmission priority is specified in advance.

If the type of data to be transmitted matches the data type defined in the data transmission stop permission information, it is determined that the transmission data can be discarded, the transmission data is discarded, and the process is terminated. . If the data types do not match, it is determined that the transmission data cannot be discarded and data transmission is performed.

FIG. 4 shows a LAN according to the second embodiment.
5 is a flowchart illustrating the content of a calculation performed by the load control device.
First, in step b1, the transmission data from the transmission request application group 5 is taken out from the transmission request queue 7.
Next, in step b2, the load MAX is set as the initial value in the previous LAN line load information used when comparing the loads of the respective LAN lines 2. In step b3, LA
Loop by the number of N lines 2 and the loop (step b)
From the line status file 11 created by the LAN load measurement processing means 10 in steps 4 to b7), the LAN line 2
Each piece of information is extracted, and the LAN line 2 for which a transmission request is made is selected.

In step b4, the load value of the LAN line 2 is extracted from the line status file 11, and the next step b5
In the above, the load value of the LAN line taken in this time is compared with the previous LAN line load value, and if the load value of the LAN line 2 taken in this time is less than the previous value, the LAN line 2 is selected as the transmission line in step b6. . And
In step b7, the load value of the LAN line 2 which has been taken in this time is held as the previous LAN line load value, and the process returns to step b3. The load value of LAN line 2 taken in this time is
If it is equal to or more than the AN line load value, the process returns to step b3.

In step b8, the currently selected L
It is determined whether or not the load on the AN line 2 exceeds the load upper limit value of the LAN load upper limit file 12, and the currently selected L
If the load on the AN line 2 exceeds the upper limit, the process of step b9 is performed. If the load on the LAN line 2 selected this time does not exceed the load upper limit value, the process of step bl0 is performed.

In step b9, the data type of the transmission data is compared with the data type defined in the data transmission stop permission information file 13, and if they match, it is determined that the data transmission can be stopped, and the data is discarded and transmission is performed. Abort. On the other hand, if the data types do not match and it is determined that the data transmission cannot be stopped, the process of step bl0 is performed. Step b
At l0, the data is transmitted, and the process ends.

As described above, according to the second embodiment, even when the LAN line 2 with a low load does not exist, the data transmission stop permission file 13 is referred to and the low-priority data is read. Since transmission is stopped, LAN line 2
Can adjust the load.

Next, a third embodiment of the present invention will be described. FIG. 5 is a configuration diagram of the LAN load control device 4 according to the third embodiment of the present invention. This third embodiment is different from the conventional example shown in FIG. 17 in that a LAN load measurement processing means 10 for measuring the load value of the LAN line 2 and a LAN load measurement processing means 10 A line status file 11 for storing a load value, a light load transmission data file 15 in which data to be transmitted when the LAN line 2 is in a light load is stored in advance, and whether the LAN line is in a light load A LAN load lower limit file 16 storing LAN line load lower limit values for determining whether or not
When the data to be transmitted is the data stored in the transmission data file 15 at the time of light load, a light load for selecting the LAN line 2 which is less than the load lower limit stored in the LAN load lower limit file 16 and transmitting the data. Time transmission processing means 1
7 is additionally provided, and the transmission processing means 8 activates the light-load transmission processing means 17 when the data to be transmitted is the data stored in the light-load transmission data file 15; Is such that the LAN line 2 having the smallest load value is selected based on the load value of the LAN line 2 stored in the line state file 11 and data is transmitted. The setting of the data to be transmitted when the LAN line 2 is in the light load state to the transmission data file 15 at the time of light load and the setting of the lower limit of the load to the LAN load lower limit file 16 are preset from the input device 14. You.

In FIG. 5, the transmission processing means 8 receives transmission data from the transmission request application group 5 via the transmission request queue 7 and transmits the data based on the information in the line status file 11 created by the LAN load measurement processing means 10. Is determined. At this time, the data to be transmitted is the transmission data file 1 at the time of light load.
If the data is the data stored in No. 5, the light load transmission processing means 17 is activated. The light load transmission processing means 17 is LA
The LAN line 2 having a load lower than the load lower limit value stored in the N load lower limit value file 16 is selected and data is transmitted.

First, the transmission processing means 8 makes the first applications 6 a to 6 a constituting the transmission request application group 5.
When data is received from any of the k-th applications 6k via the transmission request queue 7, the data transmission processing means 8 determines the LAN line 2 to perform data transmission,
The load measurement value for each LAN line 2 is fetched from the line state file 11. The load measurement values in the line status file 11 are data created by the LAN load measurement processing means 10.

The LAN load measurement processing means 10 measures the load state of the LAN line 2 by extracting the number of packet collisions of each LAN line using an OS command, and stores the information in the line state file 11. Then, the transmission processing means 8 selects the LAN line 2 having a low load value based on the line state file 11 and transmits the data.

At this time, if the data of the transmission request is set in the transmission data file 15 at the time of light load, the transmission processing means 8 does not perform the data transmission and takes over the transmission data to the transmission processing means 17 at the time of light load. . Light load transmission processing means 1
7 transmits data after a delay until the load value of any LAN line 2 becomes less than the load lower limit value of the LAN load lower limit file 16.

FIG. 6 shows a LAN according to the third embodiment.
5 is a flowchart illustrating the content of a calculation performed by the load control device.
In step c1, a transmission request queue 7 from the transmission request application group 5 is received. In step c2,
It is confirmed that the data requested to be transmitted is set in the transmission data file 15 at the time of light load set by the input device 14, and if it is set in the transmission data file 15 at the time of light load, the process of step c3 is performed. . If it is not set in the transmission data file 15 at the time of light load, the process of step c4 is performed.

In step c3, the load MAX is set as an initial value in the previous LAN line load information used when comparing the load values of the respective LAN lines 2. In step c5,
A loop is looped by the number of LAN lines 2, and the LAN line 2 having the smallest load value of the LAN line 2 is selected in the loop (step c6 to step c9).

That is, in step c6, line load information is fetched from the line state file 11. Step c7
, The load value of the LAN line 2 taken in this time is compared with the previous LAN line load value,
If the N line load value is less than the previous value, the LAN line 2 is selected as the transmission line in step c8. Then, at step c9, the load value of the LAN line which was taken in this time is held as the LAN line load value at the previous time, and step c5
Return to If the load value of the LAN line 2 taken in this time is equal to or more than the previous LAN line load value, the process returns to step c5. In step cl0, the transmission processing means 8 transmits data to the LAN line 2 having the smallest load value, and ends the processing. In step c4, the light load transmission processing means 17 is activated and the processing is terminated.

In step c11 of FIG. 7, the light load transmission processing means 17 activated in step c4 executes
The load MAX is set as the initial value in the previous LAN line load information used when comparing the load of the N line 2. In step c12, a loop is performed by the number of LAN lines 2, and the LAN line 2 with the smallest load value of the LAN line 2 is selected in the loop (step c13 to step c17).

That is, in step c13, the load value of the LAN line 2 is extracted, and in the next step c14, the load value of the LAN line 2 is compared with the load lower limit value of the LAN line 2 set in the LAN load lower limit value file 16. If it is less than the lower limit, the process of step c16 is performed. If the load value of the LAN line 2 is equal to or more than the lower limit of the load, step c12
Return to In step c17, the L
The load value of the AN line 2 is compared with the previous LAN line load value. If the LAN line load value acquired this time is less than the previous value, the LAN line 2 is selected as a transmission line in step c16.

Then, in step c17, the previous LA
The load value of the LAN line 2 fetched this time is held as the N line load value, and the process returns to step c12. LAN taken this time
If the load value of the line 2 is equal to or greater than the previous LAN line load value, the process returns to step c12. In step c18, it is determined whether or not the transmission line is selected. If the transmission line is not selected, step c20 is performed after a predetermined time delay in step c20.
Return to 11. On the other hand, if the transmission line has been selected, the process of step c19 is performed. In step c19, the data inherited from the transmission processing means 8 is transmitted from the LAN line 2 selected in step c16, and the process is terminated.

In the third embodiment, the data designated as the transmission data at the time of light load is LA so that the transmission of the low priority data does not increase the load on the LAN line.
Since transmission is performed only when the N-line load falls below a prescribed lower limit, it is possible to prevent delay in data transmission with high priority.

Next, a fourth embodiment of the present invention will be described. FIG. 8 is a configuration diagram of the LAN load control device 4 according to the fourth embodiment of the present invention. This fourth embodiment is different from the conventional example shown in FIG. 17 in that the LAN load measurement processing means 10 for measuring the load value of the LAN line 2 and the LAN line 2 measured by the LAN load measurement processing means 10 are used. A line status file 11 for storing a load value and a LAN load upper / lower limit value file 18 in which a load upper limit value and a predetermined load lower limit value of the LAN line 2 are stored in advance are additionally provided. , The load value of all LAN lines 2 is LA
If the load is equal to or greater than the load upper limit value stored in the N load upper / lower limit value file 18, the LAN line 2 having a load lower than the load lower limit value stored in the LAN load upper / lower limit value file 18 is selected after a predetermined time delay and data is transmitted. . Further, the transmission processing means 8
When the load values of all the LAN lines 2 are equal to or greater than the load upper limit values stored in the LAN load upper / lower limit value file 18, the light load transmission processing means 17 is activated. In this configuration, the LAN line 2 having the smallest load value is selected based on the load value of the LAN line 2 and data is transmitted. The setting of the load upper and lower limit values in the LAN load upper and lower limit value file 18 is set in advance from the input device 14.

In FIG. 8, the transmission processing means 8 receives transmission data from the transmission request application group 5 via the transmission request queue 7, and based on the information in the line status file 11 created by the LAN load measurement processing means 10. The LAN line 2 for transmitting data is determined. At this time, when the load value of all LAN lines 2 is equal to or more than the load upper limit value stored in the LAN load upper / lower limit value file 18, the light load transmission processing means 17 transmits the LAN load upper / lower limit value after a certain time delay. The LAN line 2 having a load lower than the load lower limit value stored in the file 18 is selected and data is transmitted.

First, the transmission processing means 8 sets the first applications 6 a to 6
When data is received from any of the k-th applications 6k via the transmission request queue 7, the data transmission processing means 8 determines the LAN line 2 to perform data transmission,
The load measurement value for each LAN line 2 is fetched from the line state file 11. The load measurement value in the line status file 11 is data created by the LAN load measurement processing means 10.

The LAN load measurement processing means 10 measures the load state of the LAN line 2 by extracting the number of packet collisions of each LAN line 2 using an OS command, and stores the information in the line state file 11. Then, the transmission processing means 8 selects the LAN line 2 having a low load value based on the line state file 11 and transmits the data.

At this time, if the load values of all the LAN lines 2 are equal to or greater than the LAN load upper limit value of the LAN load upper / lower limit value file 18 set by the input device 14, the transmission processing means 8 transmits data. The transmission data is transferred to the light load transmission processing means 17 without being performed. Light load transmission processing means 1
In step 7, the transmission data is transmitted after a delay until the load value of any one of the LAN lines 2 becomes less than the load lower limit value set in the LAN load upper / lower limit value file 18.

FIG. 9 shows a LAN according to the fourth embodiment.
5 is a flowchart illustrating the content of a calculation performed by the load control device.
At step d1, when the transmission request queue 7 from the transmission request application group 5 is received, first, at step d
In 2, the load MAX is set as an initial value in the previous LAN line load information used when comparing the loads of the LAN lines 2. In the following step d3, a loop is performed by the number of LAN lines 2, and the loop (step d4 to step d4) is performed.
In step 8), the information for each LAN line is extracted from the line state file 11 created by the LAN load measurement processing means 10, and the LAN line 2 having the smallest load value is selected.

That is, in step d4, the load value of the LAN line 2 is extracted from the line state file 11, and is compared with the LAN line load upper limit value set in the LAN load upper / lower limit value file 18 in the next step d5. If the load value of No. 2 is less than the load upper limit value, the process of step d6 is performed. If the load value of the LAN line 2 is equal to or larger than the load upper limit value, the process returns to step d3. In step d6, the load value of the LAN line 2 taken in this time is compared with the previous LAN line load value. If the load value of the LAN line 2 taken in this time is less than the previous value, in step d7 the L
The AN line 2 is selected as the transmission line. Then, in step d8, the load value of the LAN line 2 which was taken in this time is held as the LAN line load value last time, and the process returns to step d3.
On the other hand, if the load value of the LAN line 2 taken in this time is equal to or more than the previous LAN line load value in step d6, the process returns to step d3.

In step d9, all LAN lines 2
Judge whether the load value exceeds the load upper limit value,
When the load value of the line 2 exceeds the load upper limit value, the light load transmission processing means 17 is started in step d10. On the other hand, if there is a LAN line 2 whose load value does not exceed the load upper limit value, the process of step d11 is performed. In step d11, the data received via the transmission request queue 7 is transmitted from the LAN line 2 selected in step d8, and the process is terminated. That is, the transmission processing means 8 selects a LAN line with a low load based on the line state file 11 and transmits the data.

The light load transmission processing means 17 started in step dl0 executes the previous LAN used for comparing the load of each LAN line 2 in step d12 of FIG.
The load MAX is set as the initial value in the line load information.
In step d13, a loop is performed by the number of LAN lines 2, and the loop (step d13 to step d1) is performed.
In step 8), the LAN line 2 whose load value is smaller than the load lower limit value set in the LAN load upper / lower limit value file 18 is selected.

That is, in step d14, the load value of the LAN line 2 is extracted, and in the next step d15, the load value of the LAN line 2 is compared with the load lower limit value of the LAN line 2 set in the LAN load upper / lower limit value file 18. Is smaller than the load lower limit value, the process of step d16 is performed. If the load value of the LAN line 2 is equal to or more than the lower load limit, the process returns to step d13. In step d16, the LA
The load value of the N line 2 is compared with the previous LAN line load value. If the LAN line load value acquired this time is smaller than the previous value, the LAN line 2 is selected as a transmission line in step d17. Then, in step d18, the load value of the LAN line 2 which has been taken in this time is held as the previous LAN line load value, and the process returns to step d13. Step d1
If the load value of the LAN line 2 taken in this time is equal to or larger than the previous LAN line load value, the process returns to step d16.

In step d19, all LAN lines 2
It is determined whether or not the load value exceeds the lower limit value. If the load value of all LAN lines 2 exceeds the lower limit value, the process returns to step d12 after a predetermined time delay in step d20. On the other hand, if there is a LAN line 2 whose load value does not exceed the load lower limit value, the process of step d21 is performed. That is, the data inherited from the transmission processing means 8 in step d21 is transmitted from the LAN line 2 selected in step d17, and the process is terminated.

In the fourth embodiment, the LAN line 2
If the load value is equal to or greater than the predetermined load upper limit and the load of the other LAN line is also equal to or greater than the load upper limit and data cannot be transmitted from the other LAN line, The data transmission is interrupted, and the data transmission is resumed when the load value becomes equal to or less than the predetermined load lower limit value. As a result, the load value of the LAN line 2 can be adjusted, so that data transmission can be performed properly.

Next, a fifth embodiment of the present invention will be described. FIG. 11 shows an LA according to the fifth embodiment of the present invention.
FIG. 2 is a block diagram of an N load control device 4. This fifth embodiment is different from the fourth embodiment shown in FIG.
A LAN line state diagnosis processing means 9 for additionally diagnosing the occurrence of an abnormality in the LAN line 2 is additionally provided. If the LAN line 2 is abnormal and data cannot be transmitted from another LAN line 2,
The transmission processing means 8 interrupts the temporary data transmission and activates the light-load transmission processing means 17. The activated light-load transmission processing means 17 has a normal LAN line 2 and a load value of the LAN load upper / lower limit value file 18. The data transmission is restarted when the load falls below the load lower limit value stored in. The setting of the load upper limit value and the load lower limit value in the LAN load upper / lower limit value file 18 is set in advance by the input device 14.

In FIG. 11, the transmission processing means 8 receives transmission data from the transmission request application group 5 via the transmission request queue 7 and creates a line status file created by the LAN load measurement processing means 10 and the LAN line status diagnosis processing means 9. Based on the information of No. 11, the LAN line 2 for transmitting data is determined.

First, the transmission processing means 8 transmits the first applications 6 a to 6
When data is received from any one of the k-th applications 6k via the transmission request queue 7, the transmission processing means 8 determines the LAN line 2 for data transmission from the line status file 11 to determine the load for each LAN line 2. The value and the LAN line status are fetched. The load value and the LAN line state of the line state file 11 are data created by the LAN load measurement processing unit 10 and the LAN line state diagnosis processing unit 9, respectively.

The LAN load measurement processing means 10 measures the load state of the LAN line 2 by extracting the number of packet collisions of each LAN line 2 using an OS command, and stores the information in the line state file 11. Also, LAN
The line state diagnosis processing means 9 receives a hello call from each computer (LAN load control device 4) through each LAN line 2, determines that the LAN line 2 that cannot receive the hello call is abnormal, and stores the information in the line state file 11. Store.
Then, the transmission processing means 8 selects the LAN line 2 having a low load value based on the line state file 11 and transmits the data.

At this time, if the load values of all the LAN lines 2 are equal to or larger than the LAN load upper limit value of the LAN load upper / lower limit value file 18 set by the input device 14, the transmission processing means 8 transmits the data. The transmission data is transferred to the light load transmission processing means 17 without being performed. Then, in the light load transmission processing means 17, the load value of one of the LAN
The transmission data is transmitted after being delayed until the load becomes lower than the load lower limit value of the load upper / lower limit value file 18.

FIG. 12 shows an LA according to the fifth embodiment.
It is a flowchart which shows the calculation content of an N load control apparatus. In step e1, the transmission request application group 5
Is received from the transmission request queue 7. In step e2, the last L used to compare the load of each LAN line 2
The load MAX is set as the initial value in the AN line load information. In the following step e3, a loop is performed by the number of LAN lines 2, and the loop (step e4 to step e1) is performed.
0), the LAN load measurement processing means 10 and LA
The information for each LAN line 2 is extracted from the line state file 11 created by the N line state diagnosis processing means 9 and the normal LAN line 2 having the smallest load value is selected.

That is, in step e4, the state of the LAN line 2 is extracted from the line state file 11, and in the next step e5, it is determined whether the LAN line 2 is normal.
If the AN line 2 is normal, the process of step e6 is performed.
On the other hand, if the LAN line 2 is abnormal, the process returns to step e3. At step e6, LA is read from the line status file 11.
The load value of the N line 2 is extracted, and LA is obtained in the next step e7.
LAN line 2 specified in N load upper / lower limit value file 18
If the load value of the LAN line 2 is smaller than the upper limit value, the process of step e8 is performed. On the other hand, LAN
If the load value of the line 2 is equal to or greater than the load upper limit value, step e3
Return to

In step e8, the load value of the LAN line 2 taken in this time is compared with the previous LAN line load value. If the load value of the LAN line 2 taken in this time is smaller than the previous value, the flow goes to step e9. Select line 2 as the transmission line. Then, at step el0, the LAN line 2 which was previously taken into the LAN line load value this time.
And the process returns to step e3. If the load value of the LAN line 2 taken in this time is equal to or more than the previous LAN line load value in step e8, the process returns to step e3.

In step e11, all LAN lines 2
It is determined whether or not the load value exceeds the load upper limit, and if the load value of all LAN lines 2 exceeds the load upper limit, the process of step e12 is performed. If there is a LAN line 2 whose load value does not exceed the upper limit value, the process of step e13 is performed. In step e12, the light load transmission processing means 17 is activated and the processing is terminated. Step e1
In step 3, the data received via the transmission request queue 7 is transmitted from the LAN line 2 selected in step e9, and the process ends.

The light load transmission processing means 17 started in step e12 performs the previous LA used when comparing the load value of each LAN line 2 in step e14 of FIG.
The load MAX is set as the initial value in the N-line load information.
In step e15, a loop is looped by the number of LAN lines, and in that loop (step e17 to step e22), the LAN line 2 is normal and its load value is lower than the load lower limit value set in the LAN load upper / lower limit value file 18. Select the small LAN line 2.

That is, in step e16, the state of the LAN line 2 is extracted from the line state file 11, and it is determined in step e17 whether or not the LAN line 2 is normal. Is performed. If the LAN line 2 is abnormal, the process returns to step e15. In step e18, the load value of the LAN line 2 is taken out. In the next step e19, the load value of the LAN line 2 is compared with the load lower limit value of the LAN line 2 specified in the LAN load upper / lower limit value file 18, and if the load value of the LAN line 2 is less than the lower limit value. If there is, the process of step e20 is performed. If the load value of the LAN line 2 is equal to or more than the lower load limit, the process returns to step e15.

In step e20, the load value of the LAN line 2 taken in this time is compared with the previous LAN line load value. If the load value of the LAN line 2 taken in this time is smaller than the previous value, the flow goes to step e21. Line 2
Is selected as the transmission line. Then, in step e22, the load value of the LAN line 2 taken in this time is held as the previous LAN line load value, and the process returns to step e15. If the load value of the LAN line 2 taken in this time is equal to or greater than the previous LAN line load value in step e20, step e15
Return to

In step e23, all LAN lines 2
Judge whether the load value exceeds the load lower limit value,
When the load value of the line 2 exceeds the lower limit value of the load, the process returns to step e14 after a certain time delay in step e24.
On the other hand, the LAN line 2 whose load value does not exceed the load lower limit value
If there is, the process of step e25 is performed. Step e
In step 25, the data inherited from the transmission processing means 8 is transmitted from the LAN line 2 selected in step e21, and the process ends.

In the fifth embodiment, the LAN line 2
If the load value of the second LAN line 2 is equal to or more than the predetermined load upper limit value, the load value of the other LAN line 2 is also equal to or greater than the load upper limit value, or is in an abnormal state, and data cannot be transmitted from the other LAN line 2, The transmission of the data is temporarily interrupted, and the transmission of the data is resumed when the load value becomes equal to or less than the predetermined lower limit of the load or when the line recovers from the abnormality. This allows LA
Since the load value of the N lines can be adjusted, data transmission can be performed properly.

Next, a sixth embodiment of the present invention will be described. FIG. 14 shows a LAN according to the sixth embodiment of the present invention.
FIG. 2 is a configuration diagram of a load control device 4. The sixth embodiment is different from the conventional example shown in FIG. 17 in that a LAN load measurement processing means 10 for measuring the load value of the LAN line 2 and a load of the LAN line 2 measured by the LAN load measurement processing means 10 are provided. A line status file 11 for storing values, and a LAN load upper limit file 12 for storing a load upper limit of the LAN line 2 in advance.
A load value time moving average processing means 19 for calculating a time moving average value of the load value of the LAN line 2 stored in the line state file 11; A load value time moving average value file 20 for storing the load value time moving average value is additionally provided, and the transmission processing means 8 performs the load value time movement of the LAN line 2 stored in the load value time moving average value file 20. The LAN line 2 having the smallest average value is selected and data is transmitted. The setting of the load upper limit value in the LAN load upper limit value file 12 is set in advance by the input device 14.

In FIG. 14, the transmission processing means 8 receives transmission data from the transmission request application group 5 via the transmission request queue 7, and executes the load value time moving average processing means 1.
9 and the load value time moving average file 20
Is determined on the basis of this information.

First, the transmission processing means 8 makes the first applications 6 a to 6
When data is received from any of the k-th applications 6k via the transmission request queue 7, the transmission processing means 8 uses the load value time moving average value file 20 to determine the LAN line 2 for data transmission. The load value of every 2 is taken. This load value time moving average value file 20
The load value is data created by taking a time moving average of the load values stored in the line state file 11 by the load value time moving average processing means 19. The load value of the line status file 11 is stored in the LAN load measurement processing unit 10.
Is the data created by.

The LAN load measurement processing means 10 measures the load state of the LAN line 2 by extracting the number of packet collisions of each LAN line 2 using an OS command, and stores the information in the line state file 11. Then, the load value time moving average processing means 19 calculates a load value time moving average value by taking a time moving average of the load values stored in the line status file 11 and generates a load value time moving average value file 20.
To memorize. The transmission processing means 8 selects the LAN line 2 with a low load based on the load value time moving average value of the load value time moving average value file 20, and transmits the data.

FIG. 15 shows an LA according to the sixth embodiment.
It is a flowchart which shows the calculation content of an N load control apparatus. First, in step f1, transmission data is extracted from the transmission request queue 7 from the transmission request application group 5. The previous LA used when comparing the load value (load value time moving average value) of each LAN line 2 in step f2
The load MAX is set as the initial value in the N-line load information.
In step f3, looping is performed for the number of LAN lines. In the loop (step f4 to step f8), LA in which the load value time moving average value is smaller than the LAN load upper limit set in the LAN load upper limit file 12 is used.
Select N line 2.

That is, in step f 4, the load time moving average value is taken from the load value time moving average value file 20. In the next step f5, the process is compared with the LAN load upper limit value set in the LAN load upper limit file 12, and if the load time moving average value of the LAN line 2 is less than the load upper limit value, the process of step f6 is performed. When the load time moving average value of the LAN line 2 is equal to or more than the upper limit value, the process returns to step f3. In step f6, the load time moving average value of the LAN line taken in this time is compared with the previous LAN line load value, and if the load time moving average value of the LAN line 2 taken in this time is less than the previous value, the flow proceeds to step f7. LAN line 2
Is selected as the transmission line. Then, in step f8, the load time moving average value of the LAN line 2 which has been taken in this time is held as the previous LAN line load value, and the process returns to step f3. In step f6, the LAN line 2 taken in this time
If the load time moving average value is equal to or greater than the previous LAN line load value, the process returns to step f3.

In step f9, it is determined whether or not the load value of all the LAN lines 2 exceeds the upper limit of the load.
If the load value of the N line 2 exceeds the upper limit value of the load, the process ends. If the load value of all LAN lines 2 does not exceed the load upper limit value, the processing of step fl0 is performed. In step fl0, the data is transmitted by the transmission processing means 8, and the process is terminated.

In the sixth embodiment, the LAN line 2
Of the load value of the LAN line 2 and compares the load value obtained by temporally smoothing the load value of the LAN line 2 with a predetermined load upper limit value. It is possible to evaluate a LAN load value which is not affected by fluctuations in the LAN load. This makes it possible to equalize the LAN line load.

[0086]

As described above, according to the present invention, even when the amount of transmission data is enormous or when transmission requests frequently occur, the LA for measuring the load on the LAN line and transmitting the data.
Since N lines are allocated, the load on the LAN line can be distributed and data congestion can be prevented. Further, since the state of the LAN line is diagnosed, even when an abnormality occurs in the LAN line, a normal LAN line can be automatically allocated and transmitted, and data transmission failure and omission can be eliminated. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a LAN load control device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the LAN load control device according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a LAN load control device according to a second embodiment of the present invention.

FIG. 4 is a flowchart showing the operation of the LAN load control device according to the second embodiment of the present invention.

FIG. 5 is a configuration diagram of a LAN load control device according to a third embodiment of the present invention.

FIG. 6 is a flowchart showing the computation contents of a LAN load control device according to a third embodiment of the present invention.

FIG. 7 is a flowchart showing details of step c4 shown in FIG. 6;

FIG. 8 is a configuration diagram of a LAN load control device according to a fourth embodiment of the present invention.

FIG. 9 is a flowchart showing the computation contents of a LAN load control device according to a fourth embodiment of the present invention.

FIG. 10 is a flowchart showing details of step d10 shown in FIG. 9;

FIG. 11 is a configuration diagram of a LAN load control device according to a fifth embodiment of the present invention.

FIG. 12 is a flowchart showing the computation contents of the LAN load control device according to the fifth embodiment of the present invention.

FIG. 13 is a flowchart showing details of step e12 shown in FIG. 12;

FIG. 14 is a configuration diagram of a LAN load control device according to a sixth embodiment of the present invention.

FIG. 15 is a flowchart showing the computation contents of the LAN load control device according to the sixth embodiment of the present invention.

FIG. 16 is a configuration diagram of a data transmission / reception system in which a plurality of computers are connected to a multi-line LAN.

FIG. 17 is a configuration diagram of a conventional LAN load control device.

[Explanation of symbols]

 Reference Signs List 1 multi-line LAN 2 LAN line 3 computer 4 LAN load control device 5 transmission request application group 6 application 7 transmission request queue 8 transmission processing means 9 LAN line state diagnosis processing means 10 LAN load measurement processing means 11 line state file 12 LAN load upper limit Value file 13 Data transmission stop permission information file 14 Input device 15 Light load transmission data file 16 LAN load lower limit value file 17 Light load transmission processing means 18 LAN load upper / lower limit value file 19 Load value time moving average processing means 20 Load value Time moving average file

Claims (6)

[Claims] 1. A LAN load control device for controlling a load on a LAN line of a data transmission / reception system in which a plurality of computers are connected in a network environment constituted by a plurality of LAN lines and mutually transmit and receive data between the computers. Diagnosing the occurrence of abnormality in the LAN line
AN line state diagnosis processing means, LAN load measurement processing means for measuring the load value of the LAN line, a line state file for storing the load value of the LAN line and the diagnosis result of the LAN line, Transmission processing means for selecting a normal LAN line having the smallest load value and transmitting data based on the stored load value of the LAN line and a diagnosis result of the LAN line. Load control device. 2. A LAN load control device for controlling a load on the LAN line of a data transmission / reception system in which a plurality of computers are connected in a network environment constituted by a plurality of LAN lines and mutually transmit and receive data between the computers. A LAN load measurement processing means for measuring a load value of the LAN line, a line status file storing the load value of the LAN line measured by the LAN load measurement processing means, and a load upper limit value of the LAN line. LA stored in advance
An N load upper limit file, a data transmission stop permission information file in which low priority data is designated and stored in advance based on the type of the data, and an attempt is made to transmit when the load value of the LAN line is equal to or more than the load upper limit value. A transmission processing unit for suspending the transmission of the data when the data to be transmitted matches the data stored in the data transmission suspension permission information file. 3. A LAN load control device for controlling a load on the LAN line of a data transmission / reception system in which a plurality of computers are connected in a network environment constituted by a plurality of LAN lines and mutually transmit and receive data between the computers. A LAN load measurement processing means for measuring the load value of the LAN line, a line state file storing the load value of the LAN line measured by the LAN load measurement processing means, A light load transmission data file in which data to be transmitted at a certain time is designated and stored in advance, and an LA in which a load lower limit value of the LAN line for determining whether the LAN line is under light load is stored.
If the N load lower limit file and the data to be transmitted are the data stored in the light load transmission data file, select a LAN line less than the load lower limit stored in the LAN load lower limit file. Light-load transmission processing means for transmitting data; and the line state if the light-load transmission data file is data stored in the light-load transmission data file and the light-load transmission processing means is not to be activated. And a transmission processing means for selecting a LAN line having the smallest load value based on the load value of the LAN line stored in a file and transmitting data. 4. A LAN load control device for controlling a load on the LAN line of a data transmission / reception system in which a plurality of computers are connected in a network environment constituted by a plurality of LAN lines and mutually transmit and receive data between the computers. A LAN load measurement processing means for measuring the load value of the LAN line, a line status file storing the load value of the LAN line measured by the LAN load measurement processing means, A LAN load upper / lower limit value file storing a predetermined load lower limit value in advance, and a LAN load upper limit value stored in the LAN load upper / lower limit value file when the load values of all the LAN lines are equal to or greater than the load upper limit value stored in the LAN load upper / lower limit value file. A light load transmission processing method for selecting a LAN line less than the lower load limit stored in the upper and lower load limit file and transmitting data. When the load values of all the LAN lines are equal to or greater than the load upper limit value stored in the LAN load upper / lower limit value file, the load processing unit is stored in the line state file when it is not likely to activate the light load transmission processing means. Transmission processing means for selecting a LAN line having the smallest load value based on the load value of the LAN line and transmitting data. 5. The LA load control device according to claim 4, wherein the LA for diagnosing the occurrence of an abnormality in the LAN line.
N-line state diagnosis processing means is additionally provided. If the LAN line is abnormal and data cannot be transmitted from another LAN line, the transmission processing means interrupts the temporary data transmission and sets the light load transmission processing means to Activated, the light load transmission processing means checks that the LAN line is normal and the load value is
A LAN load control device wherein data transmission is restarted when the load becomes lower than a load lower limit value stored in a load upper / lower limit value file. 6. A LAN load control device for controlling a load on the LAN line of a data transmission / reception system in which a plurality of computers are connected in a network environment constituted by a plurality of LAN lines and mutually transmit and receive data between the computers. A LAN load measurement processing means for measuring a load value of the LAN line, a line status file storing the load value of the LAN line measured by the LAN load measurement processing means, and a load upper limit value of the LAN line. LA stored in advance
N load upper limit value file, load value time moving average processing means for calculating a time moving average value of the load value of the LAN line stored in the line state file, and load value time moving average processing means. A load value time moving average value file storing the load value time moving average value of the LAN line, and an LA having the smallest load value time moving average value of the LAN line stored in the load value time moving average value file
A LAN load control device comprising transmission processing means for selecting N lines and transmitting data.