JPH03218140A - Data transfer control system - Google Patents

Abstract

PURPOSE:To prevent the quantity of connection path information stored in a communication server from being increased even when a network system is made complicated by allowing a terminal controller to transfer data based on the connection path information stored in the communication server. CONSTITUTION:Terminal controllers 41-1 to 44 to M4 are provided for adding connection path information for a transmission destination local area network acquired from communication servers 21-1 to 24-1 interfacing another local area networks 11-14 to a data inputted from a terminal equipment and sending the resultant data. Moreover, communication servers 21-1-24-1 eliminating a part representing a path to an opposite party to which the data is sent from the connection path information added to the data received from the other network and sending the result to the opposite party together with the data are provided to the data transfer control system. Thus, the data transfer control system is realized, in which complicated network system or revision of the constitution is flexibly coped with.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a network system, and particularly to a data transfer control system that controls data transfer between i number of local area networks.

[Conventional technology]

A large number of computers, data terminals, and office automation equipment such as facsimile machines and word processors located in a relatively small area such as an office or factory are usually interconnected by a low-power network (hereinafter referred to as LAN). There are many. This LAN may be used by only a single system, but new LANs may be added from time to time due to expansion of offices or factories, etc., and as a result, multiple independent LANs may be interconnected. There will also be a need to use it.

Conventionally, when data is transferred between multiple LAN systems, the terminal control device that controls the connection between the transmission path and the terminals has to memorize the transmission and reception routes to other LAN systems. was.

Then, these terminal control devices select a communication server that performs communication between each LAN system according to the transmission/reception routes stored in their own memory, and perform transmission/reception control with other LAN systems via the selected communication server. It had become.

[Problem that the invention seeks to solve]

Conventionally, data transfer control between multiple LAN systems has been performed based on the transmission and reception paths stored for each terminal control device.As network systems become more complex, terminal control devices The disadvantage is that the number of transmission and reception routes becomes extremely large. Furthermore, when a new terminal control device is added, transmission/reception routes must be added and changed for all the terminal control devices each time, resulting in a lack of flexibility for system changes.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a data transfer control system that can flexibly respond to increasing complexity of a network system and changes in configuration.

[Means to solve the problem]

In the invention as claimed in claim 1, (i) connection route information to a destination local area network obtained from a communication server that performs ink face with other local area networks is added to data input from a terminal and transmitted. (l1) From the connection route information added to the data received from another network, delete the part indicating the route to the next destination to send the data, and The data transfer control system is equipped with a communication server that sends data to the data transfer control system.

In the invention described in claim 1, the terminal control device transfers data via the communication server based on the connection route information provided by the communication server in its own local area network, and the communication server transfers data to other communication servers. The part indicating the route to the next destination to which the data should be sent is deleted from the connection route information added to the data from the local area network, and then this is sent together with the data.

In the invention as claimed in claim 2, (a) (1) when the data transmission request from the terminal is for a terminal in another local area network, the data transmission request from the terminal exists in the own local area network and has no connection with the other network; connection point information requesting means for requesting all communication servers provided for connection to provide connection point information indicating the number of connection points on a connection route that is a route for transmitting and receiving data with a destination local area network; (11) Connection route information indicating the connection route to the destination local area network for the communication server that provided the least number of connection points among the connection point information returned from all the communication servers in the own network. a connection route information requesting means for requesting the provision of (1■
) The communication server that provided the smallest number of connection points, along with the transmission data, receives the connection route information obtained from the communication server that provided the smallest number of connection points and the destination terminal identification code attached to the destination terminal. (i) a storage means for storing connection routes to other local area networks; and (ii) connection point information and connection route information from the terminal control device. sending means for sending the information stored in the storage means to the terminal control device making the request when there is a request;
iii) a decoding means for decoding the connection route information and destination terminal identification code received together with the transmission data from the terminal control device; and (iv) as a result of the decoding by this decoding means, it is determined that the destination terminal belongs to its own local area network. (v) decryption by the decryption means; (v) decryption by the decryption means; As a result, when it is determined that the destination terminal belongs to another local area network, the part related to the connection route within the own local area network is deleted from the connection route information, and this information is transferred to the destination terminal. The data transfer control system is provided with a communication server having a second transmission means for transmitting the identification code and the transmission data together with the deleted portion to the communication server.

In the invention as claimed in claim 2, when the communication server that stores the connection point information and the connection route information sends this information to the terminal control device that has requested the connection point information, the terminal control device selects the connection point information with the least number of connection points. The connection route information and destination terminal identification code obtained from the communication server that provided the information are added to the transmission data and sent to the communication server.

On the other hand, a communication server that receives data from another local area network decodes the connection route information and destination terminal identification information added to the data, and uses these information to determine which data should be forwarded to the next destination within its own local area network. After deleting the part leading to the communication server or terminal control device, the data is sent together with the transmission data to the corresponding communication server or terminal control device.

In the invention according to claim 3, when the number of connection points indicated by the connection point information returned from all the communication servers in the local area network is the same, the connection point returned first among them is The terminal control device of the data transfer control system according to claim 2 is provided with second connection route information requesting means for requesting provision of connection route information from a communication server having the information.

According to the third aspect of the present invention, when the number of connection points is the same through any communication server in the own local area network, data is transferred via the communication server that first provided the connection point information. We will do so.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to examples.

FIG. 1 shows a data transfer control system in one embodiment of the present invention.

Here, a case will be described in which data is transferred between four LANIs 1 to 14.

The first LAN II is provided with two communication servers 21-1 and 21-2 that communicate with other LANs, and are connected to each other by a transmission path 16. , 13. This transmission path 16 includes M terminals 31-1 to 31-'M.
are connected via terminal control devices 41-1 to 41-M, respectively.

The second LAN 12 includes three communication servers 22-1 to 22-2.
2 to 3 are provided and connected to the transmission line 17. Among these, the first communication server 22-1 is connected to the first LAN II communication server 21-1, and the second and third communication servers 22-2 and 223 are connected to the fourth and third LAN 1, respectively.
4, connected to l3. Furthermore, M2 terminals 32-1 to 32M2 are connected to the transmission path 17 via terminal control devices 42-1 to 42M2, respectively.

The third LAN 43 includes two communication servers 23-1 and 2.
3-2 is provided and connected to the transmission line 18. Among these, the first communication server 23-1 is connected to the first LAN II communication server 21-2, and the second communication server 23-1 is connected to the first LAN II communication server 21-2.
-2 is connected to the communication server 22-3 of the second LAN 12.

The transmission line 18 also includes M terminals 33-1 to 33.
-M3 are terminal control devices 43-1 to 43-M, respectively;
connected via.

The fourth LAN 14 is provided with a communication server 24-1, which is connected to the transmission path 19 and also connected to the communication server 22-2 of the second LAN 12. The transmission path 19 also includes M4 terminals 34-1 to 34-M. are the terminal control devices 44-1 to 44-M. connected via.

FIG. 2 shows a communication table held by each communication server in FIG. 1.

In this figure, the network ID column contains the first to fourth L.
Numerals 11 to 14 of AN are shown.

As shown in this figure, communication server 21-L21-2
1! - They each have communication tables 51-1 and 51-2, in which connection point information indicating the number of connection points of connection routes to other local area networks is registered. In addition, other communication servers 22-1 to 24-1
Also, connection point information is stored in similar communication tables.

Next, the operation of the data transfer control system configured as above will be explained.

First, with reference to FIG. 3, the operations performed between the terminal control device and the communication server when communicating from the terminal to another local area network will be explained. Here, as an example, from the terminal 31-1 of the first LAN 11 to the fourth
The operation when data is transferred to the terminal 34-2 of the LAN 14 will be explained.

The first LAN II terminal control device 41-1 is the terminal 31
-1 to the terminal 342 of the fourth LAN 14 (step ■ in Figure 3), the data transmission request is sent to the other L
It is determined that it is a data transfer request to the AN (step ■; Y),
A communication request is made to the communication servers 21-1 and 2l-2 within the own LAN (step (2)). Furthermore, if the data transmission request is for a terminal within its own LAN, skip step (2); N), and transfer the data to the terminal control device corresponding to that terminal (step (2)).

The communication server 21-1 uses its own communication table 51-1.
(Fig. 2) Since the connection route information 55 (same figure) to LAN14 exists (step ■; Y), the connection point information "2" indicating the number of connection points of that connection route is sent to the terminal control device 4.
1-1 (step ■). On the other hand, communication server 2
1-2, since there is no connection route information to the LAN 14 on its own communication table 51-2 (same figure) (step ■; N), that fact is returned to the terminal control device if41-1 (step ■). As a result, the communication server 211 is selected (step ■), and connection route information is sent back from this communication server to the terminal connection device 41-1 (step @). Note that the communication table 5l of the communication server 21-2
If the connection route information to the LAN 14 also exists in the communication server 21-2, the connection point information is also returned from the communication server 21-2.

In this case, the terminal control device 41-1 selects the communication server having the least amount of connection point information among the received connection point information (step (2)). In addition, if the number of connection points indicated by these connection point information is the same, step 2; Y) selects the communication server that returned the connection point information first (step 0).
.

The terminal control devices 41-1 add the connection route information obtained from the communication server 211 to the data to be transmitted together with the identification code of the destination terminal 34-2 (hereinafter referred to as destination terminal ID), and send the connection path information to the communication server 211. Send to 21-1 (Step @)
. Then, the communication server 211 transfers this to the second LANI.
2 to the communication server 22-1.

Next, the operations in the second LAN 12 and the fourth LAN 14 will be explained with reference to FIG.

The communication server 22-1 of the second LAN 12 is connected to the first LA
Data, connection route information, and destination terminal I from NII
When D is received, these are decoded (Step ■ in Figure 4)
). In this case, the communication server 22-1 determines that this data is not for its own LAN 1 2 (step ■; N), and the next communication server to send data to is its own LAN.
It is determined that the communication server 22-2 in I2 is the communication server 22-2 (step ■). Then, the communication server 22-1 deletes the route information from the connection route information to the communication server 22-2 (step ■), and then deletes the data and the destination terminal I.
Send to the communication server 22-2 together with D (step ■)
. The communication server 22-2 then transfers the received data and information to the communication server 24- of the fourth LAN 14.
1 (step ■).

The fourth L. The communication server 24-1 of the AN 14 decodes the received data (step 2) and determines whether the data is for its own LAN (step 2). In this case, the received data is sent to the terminal 3 within its own LAN 14.
4-2 (Step ■; Y), the destination terminal ID is deleted (Step ■), and the data is transmitted to the terminal control device 44-1 (Step ■). This data is then transmitted to terminal 34-1.

In this way, data is transferred from the first LAN II terminal 31-1 to the fourth LAN 14 terminal 34-2.

〔Effect of the invention〕

As explained above, according to the invention set forth in claim 1, the terminal control device transfers data based on the connection path information stored in the communication server, so even if the network system becomes complicated, This has the advantage that the amount of connection route information to be stored in each communication server does not need to become very large. Additionally, when making changes to the system, such as adding a new terminal control device, there is no need to change the connection route information for all terminal control devices each time, as was the case in the past, and the storage contents of the corresponding communication server can be changed. Just do it. Therefore, there is an effect that it is possible to respond flexibly to changes in the system.

Further, according to the invention as claimed in claim 2, when a plurality of communication servers have connection routes to the local area network of the communication destination, the communication server having the connection route with the least number of connection points is selected. Therefore, data can be transferred using the shortest route. Therefore, there is an effect that communication speed can be increased.

Further, according to the invention set forth in claim 3, when a plurality of communication servers have connection routes to the local area network of the communication destination and the number of connection points is the same, the connection point information is transmitted first. Since the communication server that sent the message back is selected, it is possible to avoid conflicts between the communication servers.

[Brief explanation of drawings]

The drawings are for explaining one embodiment of the present invention. Among them, Fig. 1 is a block diagram showing a data transfer control system, and Fig. 2 is an explanation showing a communication table held by each communication server in Fig. 1. Figure 3 is a flowchart for explaining the operation between the terminal control device and the communication server, and Figure 4 is a flowchart for explaining the operation between the terminal control device and the communication server.
FIG. 3 is a flowchart for explaining the operation of the communication server when receiving data from N. FIG. ■1 to 14...Local area network,
21-1 to 24-1... Communication server, 31-1
~34-M4...Terminal, 41-1~44-M
．． ...Terminal control device.

Claims (1)

[Claims] 1. Terminal control that adds connection route information to a destination local area network obtained from a communication server that interfaces with other local area networks to data input from the terminal and sends the data. From the connection route information added to the data received from the device and another network, a part indicating the route to the next destination to which the data should be sent is deleted, and the data is then sent to the destination to be sent together with the data. A data transfer control system comprising: a communication server. 2. When a data transmission request from a terminal is to a terminal in another local area network, all communication servers that exist within the own local area network and are used for connection with other networks are requested to send the data to the destination. connection point information requesting means for requesting provision of connection point information indicating the number of connection points on a connection path that is a route for sending and receiving data with the local area network; and connections returned from all communication servers in the own network. connection route information requesting means for requesting a communication server that has provided the least number of connection points among the point information to provide connection route information indicating a connection route to a destination local area network; A transmission in which connection route information obtained from the communication server that provided the smallest number of connection points and a destination terminal identification code attached to the destination terminal are sent together with the transmission data to the communication server that provided the smallest number of connection points. a terminal control device having means; and a storage means for storing a connection route to another local area network; when the terminal control device requests connection point information and connection route information, the information is stored in the storage means a sending means for sending these pieces of information to the terminal control device that made the request; a decoding means for decoding the connection route information and destination terminal identification code received together with the transmission data from the terminal control device; When it is determined that the destination terminal belongs to the own local area network as a result of decoding by means, the destination terminal identification code is removed and the transmission data and connection route information are sent to the corresponding terminal control device. a first transmitting means for transmitting data to a local area network; and when it is determined that the destination terminal belongs to another local area network as a result of the decoding by the decoding means, it is determined that the destination terminal belongs to another local area network based on the connection route information; A second method that deletes the part related to the connection route and sends this together with the destination terminal identification code and the transmission data to the communication server corresponding to the deleted part.
1. A data transfer control system comprising: a communication server having a transmission means; 3. When the number of connection points indicated by the connection point information returned from all the communication servers in the own local area network is the same, the communication server having the connection point information returned first among them; 3. The data transfer control system according to claim 2, further comprising a terminal control device having second connection route information requesting means for requesting provision of connection route information.