JPH043547A - System interconnecting computers - Google Patents

Abstract

PURPOSE:To dynamically search a computer being a connection opposite party at the connection by designating a node name of a computer of a connection destination to send a connection request to a network, receiving a reply from the computer to make the connection with the computer being the connection destination complete. CONSTITUTION:A computer 2a designates a node name of a computer being connection destination from a communication program 8a and gives a connection request to a control program 5a. Then the control program 5a gives the connection request to a connection processing program 9a, which takes over the control to check the connection of input output control sections 3a1, 3a2 and broadcasts the connection request to all computers connecting to LANs 1a,1b while designating the destination node name to both the input output control sections 3a1, 3a2. When the opposite computer is connected to only a LAN of one system, the reply is returned to the computer 2a to connect the opposite computer and the computer 2a to attain communication for application programs. Thus, the computer being the connection destination is dynamically sought at the connection.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a calculation line connection system in a data communication system having a plurality of computers connected to each other by, for example, a dual local area network.

[Conventional technology]

FIG. 2 is a block diagram showing the configuration of a data communication system that employs a conventional calculation line connection method. In Figure 2, l
a and 1b are redundant local area networks (
(hereinafter referred to as LAN), and 2a to 2d are computers connected to LAN1a and 1b (however, computer 2b is connected only to LAN1a, and computer 112c is connected only to LAN1b). The calculation 1fi2a includes an input/output control unit 3a1 that performs data input/output control with the LAN1a, and a LAN
An input/output control unit 3a that controls input/output of data with 1b
z, a connection control program 4a for controlling connections with the LANs 1a and 1b, a control program 5a for overall control, a node name 6a which is a unique symbolic name given to one computer, and a duplicated LA.
Connection information of other computers to N1a and 1b, i.e. LAN'l
It is provided with system generation information 7a indicating whether the computer is connected to LAN 1a or lb, and a communication program 8a for performing inter-application communication with other computers using LAN 1a or 1b. The computer 2b includes an input/output control unit 3b that performs data input/output control with the LAN 1a, a connection control program 4b, a control program 5b, and a node name 6b.
, system generation information 7b, and communication program 8b. A total of 1i[2c includes an input/output control unit 3C1 for controlling input/output of data with the LAN 1b, a connection control program 4C1, a control program 5G, a node name 6C, system generation information 7C1, and a communication program 8C.

The computer 2d includes an input/output control unit 3d1 that controls input and output of data to and from the LAN 1a, an input and output control unit 3d2 that controls the input and output of data to and from the LAN 1b, a connection control program 4d, a control program 5d, a node name 6d, It includes system generation information 7d and communication program 8d.

By the way, in a dual-system LAN, each computer may have nodes for two LANs, or only some computers may have nodes for two LANs, and other computers may only be connected to one LAN. In many cases, it is not.

Computers 2a and 2d shown in Figure 2 are connected to LANs 1a and 1b (
7) This is a case where both systems are connected to the LAN, but computers 2b and 2C are connected to only one system of LAN.

Next, the operation of this conventional example will be explained. Dual LA
Communication between applications in N is performed as follows. For example, in the computer 2a, the communication program 8a
A connection request is issued to the control program 5a by specifying the node name of the destination computer. Control program 5a
passes the connection request to the connection control program 4a, and the connection control program 4a issues a connection request by referring to the system generation information 7a, which is a correspondence table between node names and LANs defined during system generation.
Determine AN1a or LAN1b, input/output control unit 3a1
Alternatively, the input/output control unit 3az broadcasts the connection request to all computers connected to the LAN of that system. On the broadcast computer side, if the connection request is for its own node name, by returning a response to the connection request, it is connected to the broadcast controller 112a, and communication between applications can be performed.

[Problem to be solved by the invention]

However, in the conventional inter-computer connection method as described above, before performing inter-application communication on a dual-system LAN, it is necessary to check which computer is connected to which system's LAN for each computer, or whether both computers are connected to which system's LAN. It is necessary to create information indicating which system is connected to the system's LAN and which system should be prioritized through system generation. Furthermore, even when dynamically searching for a connection partner in a system that is not a duplex system, information on which system to search from when the system becomes a duplex system is required. Therefore, the conventional method has the problem that every time a new computer is added to the LAN, system generation information for all the computers must be added, and it is not possible to flexibly respond to the addition of computers.

This invention was made to solve the above-mentioned problems, and allows communication between applications in multiple networks without the need for system creation (it enables the computer to dynamically search for a connection partner at the time of connection, The purpose of this research is to provide a connection method between computing lines that can flexibly accommodate expansion of the number of computers.

[Means to solve the problem]

In the calculation line connection method according to this invention, each
Node name 6 symbolically named a2a to 2d
Connection processing programs 9a to 9d are provided to perform connection processing with other computers based on steps a to 6d, and a computer issuing a connection request uses the connection processing program to specify the node name of the computer to be connected to. Connection request to network 1
A, '1b, and by receiving a response from the computer corresponding to the corresponding node name, the connection with the destination computer is completed.

[Effect]

For example, the computer 2a starts the connection processing program 9a, specifies the node name 6b, and sends a connection request to the network 1.
a, 1b, the computation e12b connected to the network 1a responds. This response is received by computer 112a, and computer 2a completes the connection with computer 2b.

〔Example〕

FIG. 1 is a block diagram showing the configuration of a data communication system employing a calculation line connection method according to an embodiment of the present invention.

In FIG. 1, components corresponding to those shown in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted. In FIG. 1, 9a-9d are connection processing programs for performing connection processing with other computers based on the node names 6a-6d symbolically named for each calculation 112a-2d.

Next, the operation of this embodiment will be explained. Connection processing for inter-application communication in a dual local area network is performed as follows.

When a computer connected to the local area network of both systems issues a connection request, it unconditionally broadcasts the connection request to both systems (specifies the node name of the connection partner to all computers and issues a connection request). For example, calculation fi
2a, the communication program 8a issues a connection request to the control program 5a by specifying the node name of the destination computer.

Next, the control program 5a transfers control of the connection request to the connection processing program 9a, and this connection processing program 9a checks the connection of the input/output control units 3a1#3a2, and checks the connection of the input/output control units 381e3a2. Specify the destination node name and send a connection request to both LANs 1a and 1.
Broadcast to all computers connected to b. As a result, the target computer is connected to a one-sided LAN.
If the computer connected only to LA″N on one side makes a connection request for its own node name, a response to this is returned to computer 2a, and the other computer and computer 2a are connected. communication between applications.

On the other hand, the other party's computer is LAN1a on both systems.

1b, responses are returned from the LANs 18.1b of both systems, but the response returned first is given priority and the other computer is connected to the computer 2a to perform inter-application communication.

In this way, according to the above embodiment, in inter-application communication in a dual-system LAN, a connection request is issued to both LANs at the same time using a symbolic node name uniquely set in the system for each computer. By doing so, you can dynamically search for a connection partner at the time of connection and connect between computers, and there is no need to be aware of duplex systems.
This eliminates the need to create a system for the dual system even if a computer is additionally connected to the dual system LAN.

Therefore, by using the connection procedure described above, when adding computers, you only need to set your own node name to the added computer, and the existing computers can be operated without changing the system generation.

In the above embodiment, the LAN was duplicated to create two systems, but even if the LAN was made into one system and only the input/output control unit was duplicated,
A similar effect can be obtained.

Further, similar effects can be obtained not only in inter-application communication in a local area network but also in wide area network connections.

The computer in the above embodiment conceptually includes a terminal device and other input/output devices.

〔Effect of the invention〕

As described above, according to the present invention, by specifying the node name of the connection destination computer, sending a connection request to the network, and receiving a response from the computer corresponding to the corresponding node name, the connection destination Since the connection with the computer is completed, it is possible to dynamically search for the computer to connect to at the time of connection, and the connection process can be performed without being aware of the number of systems such as duplex systems. You can flexibly respond by simply setting your own node name only to the computers added at the time of expansion, and you can operate existing computers without changing the system generation.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the configuration of a data communication system that employs a connection method between calculation lines according to an embodiment of the present invention, and FIG. be. 1a, 1b...Local area network,
2a-2d... Calculator, 6a-6d...
- Node name, 9a to 9d...Connection processing program.

Claims (1)

[Claims] In a data communication system that has multiple computers connected to each other via a network, each computer is provided with a connection processing program to perform connection processing with other computers based on a symbolically named node name, and a computer that issues a connection request. uses the above connection processing program,
The feature is that the connection with the destination computer is completed by specifying the node name of the destination computer, sending a connection request to the network, and receiving a response from the computer corresponding to the node name. A computer-to-computer connection method.