JPS5933958A - Data transmitting and receiving system of computer network - Google Patents

Abstract

PURPOSE:To decrease the memory resources needed for preservation of control data, etc., by carrying out the transmission and reception of data among computers of a computer network through a small number of logical communication lines. CONSTITUTION:Communication circuits connect computers A and B, B and C, C and D, B and E, and E and F respectively. Thus a logical communication line can be set to an optional computer of the remote side. The logical communication line for transmission and reception of data is not set for all computers. That is, the logical communication lines are set just between computers A and B, B and C, and C and D in case the data is transmitted or received between host computers A and D. The number of logical communication lines is set less than that of physical communication lines even in case an optional logical communication line is set among all host computers.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention is directed to a B1 computer network, that is, a system that enables a plurality of 81i machine systems to share resources such as software, software, and data with each other. ,
This relates to a system in which a plurality of #In machines are connected via a communication line.

(bl) Conventional technology and its problems Anatomy of multiple 1/F, machine systems, pumice formation by sharing resources, improvement of reliability by dispersion of resources, cost improvement by distributed processing (Improvement of performance ratio, improvement of cost by joint processing) An 81W machine network is known in which a plurality of computer systems are connected via communication lines to exchange information for the purpose of enhancing processing functions.

81 The format of computer networks includes star, net, loop, and tree shapes. For example, as shown in Figure 1, δ
(The conventional data exchange method will be explained for a computer network in which 8J computers B and C are interposed between W machines A and D, and computer E is interposed between computers B and F. ... F are physically connected by communication path P..., and calculation ID, F, etc. are connected to the computer via relay computers B and C1E. If there are δ1WX machines A-F, and data is exchanged between arbitrary partner computers, for example, when looking at computer A as the center, as shown by the dashed line, data is exchanged between computers A-B, A- Between C, between A and 0, between A and -F,
From computer A to all other δ1', such as between A and F.
It is necessary to set up a logical communication path between M and machines B...F. Also, when viewed from another computer B, the calculation tJ
Logical communication paths are set up between llB and all other computers A, C...F. In this way, each calculation tJIA
. . . It is necessary for F to set logical communication paths in pairs for all partner computers, and a different independent logical communication path is set for each partner computer.

Therefore, as the number of boss 1-computers in a computer network increases, the number of logical communication paths also increases. There is a risk that overflow 1 may occur due to setting and opening. In addition, with such a large number of logical communication paths set, information such as the attributes of each communication path and the 1ffJ communication rules must also be stored in memory (as this is necessary, memory resources will also increase. Must be.

(C1 Purpose of the Invention The present invention solves such problems in the conventional data transfer method in a computer network, reduces the number of logical communication paths, and as a result, makes it easier to set up and open logical communication paths. It is an object of the present invention to reduce operations and also to reduce memory resources for storing management data and the like.

(d) Structure of the Invention In order to achieve this object, the present invention provides a method of communicating via a plurality of logical communication channels when exchanging data between each autopsy W machine in a computer work, The communication entity in the computer network sets and transmits information that identifies the other party's computer along with the data to be sent, and the computer that relays the transmitted data establishes an appropriate logical communication channel based on the information that identifies the other party's d1 computer. At the same time, the information indicating the correspondence between the identifier given to the transmitted data on the received communication path, the identifier given to the transmitted data on communications 1 to 3 to be transmitted, and the communication path is selected and transmitted. On the other hand, the computer that relays the response to the transmitted data uses the stored information to know the logical communication path and identifier to which the response should be sent back, and sends the response back via the logical communication path. A method is adopted in which the above-mentioned stored information is released.

(e1 Embodiment of the Invention Next, an embodiment of the data transfer method in a computer network according to the present invention will be described. FIG. 2 is a diagram showing a computer network, and FIG. 3 is a diagram showing the operation of data transfer in this computer network. In the case of the present invention, the second
As shown in the diagram, between the computer and IB, between B and C, between C and 0, and between B and B.
-E and E-F are connected by communication lines, respectively, so that a logical communication path can be set up with any other computer.

When setting a logical communication path for receiving and receiving data 1, 1. If data is to be exchanged between 0 and 0 to the boss computer, instead of setting between all the host machines W as in the past, the logical communication paths are between A and 8, between B and C, and between C and B. and 0.

Therefore, there will be multiple logical communication paths, but even when setting arbitrary logical communication paths between two machines, the number of logical communication paths will exceed the number of physical communication paths. It never increases beyond the number.

Now, the case where data is exchanged between boss I, computer F, and the post computer will be explained based on FIG. 3.

It is assumed that Δ, B, C, D, E, and F in this figure correspond to the box 81'W, and the numbers A, B, C, and D in FIG. 2, respectively. First, when transmitting data from the communication entity in Boss I/R1 computer A to the communication entity in Boss total N: tJIt D, information d is set without indicating D, which is the other party's computer, and the total amount is $119. No. 1 on the route to D “J
1 degree computer B4: In order to select and specify the relay, the identifier 5Nab on the logical communication path Pab is set, and the data is added to the transmission data and sent to the first relay machine B. .

Relay computer B, which has received such information, selects the next logical communication path as appropriate based on the information (I) for identifying the destination computer, and also selects the next logical communication path on the selected logical communication path Pbc. The identifier 5Nbc is set and sent to the next relay computer C on the route to the target post computer.At this time, the identifier 5Nab, which was given to the transmission data on the previous communication path Pab, is communication path P to relay computer C of
The identifier 5Nbc included in the transmission data of bcl and information indicating the correspondence between the received logical communication path Pab and the transmitted logical communication path Pbc are stored in the memory by the relay computer B. In addition, it is attached to the transmitted data on the logical communication path! The identifiers 5Nab, 5Nbc, etc. to be searched can also include information indicating the logical communication path.

When the second relay computer C also receives the transmission data from the failed talW-machine B, it uses the information d for identifying the destination δ1 computer to identify the target host's old computer, as in the case above. The logical communication path Pcd to the machine is selected and transmitted together with the identifier 5Ncd on the logical communication path Pcd.

At this time as well, the identifier 5Nbc added to the transmission data on the previous communication path, the identifier 5Ncd added to the transmission data on the communication path to the target host W machine, and the logical communication path Pbc. Information indicating correspondence with PCD is relay anti-detection device C.
is stored in memory.

When the target host number 1 is received, response information corresponding to the received information is sent back to the sending host host, but in this case, the response information is , post 1-41 computer D-logical communication path Pcd-relay computer C-logical communication path Pbc-relay calculation RB-logical communication path Pab-return to the post computer.

In other words, the terminal post] - Calculation tJ, 11 In D, the response information is transmitted by selecting the same logical communication path Pad as at the time of reception,
Each computer that relays the response information knows the logical communication path and identifier to which the response should be sent based on the information saved at the time of the previous transmission, and sequentially selects and identifies the logical communication path for returning the response. By adding a word and sending it back, the message is sent back to the target host computer. As a result, by receiving a response with the same identifier as the identifier at the time of transmission, the sender's old postal computer receives a response indicating that the transmitted data has been received by the other party's postal computer. Ru.

Furthermore, each relay computer receives a response with the same identifier as the stored information at the time of transmission.

By repeating this operation for each communication entity,
Information is exchanged between the post computer and the target post computer. Also, when sending and receiving data between host computer tJ3t A and another host computer F, the following information is used: Boss computer A - Logical communication path Pab - Relay computer B - Logical communication path Pbe - Relay computer E - Logical communication路Pef
- A logical communication path is selected in the route of post computer F,
Sent. When the transmission data is received by the target boss calculation taF, it is sent to the originating/originating host 1 to
Response data is returned to δlWtMtΔ.

The same operation is used when data is exchanged between other boss computers, for example, D and F, using logical communication paths Pcd and P.
bc, Pbe, Pef are selected.

In this way, after data is sent to the next DL computer, the identifier and line correspondence information are memorized and saved, and the line is released after the data is sent, so when data is exchanged between any host computer. However, no more than five logical communication paths are always sufficient.

Note that it is more efficient to set the logical communication paths all at once when starting up the network and to release them all at once when the network is terminated, without necessarily setting up/opening the logical communication paths every time data is sent/received.

(f1 invention) As described above, according to the present invention, data is exchanged between computers in a computer network via a plurality of logical communication paths, and the transmitted data is relayed. The dividing machine selects and transmits a suitable logical communication path based on the information that identifies the other computer, and also uses the identifier given to the transmission data on the received communication path and the transmission data on the communication path to be transmitted. The given identifier and information indicating the correspondence relationship between the communication channels are stored in memory.On the other hand, in the computer that relays the response to the transmitted data, the computer that relays the response to the transmitted data uses the stored information G to determine the logic for returning the response. The logical communication path and identifier are known, a logical communication path is selected, and the return is performed.

In this way, after sending data to the next computer, the identifier and line correspondence information are memorized and saved, so no matter which post computer sends or receives data, the logical communication path is the same as the physical communication path. The number of logical communication channels does not increase more than the number of physical communication channels, and compared to the conventional method shown in Figure 1, which requires 15 logical communication channels, which is three times the number of physical communication channels. It turns out. Therefore, there is no overhead associated with setting up and opening a large number of logical communication paths as in the past, and as the number of logical communication paths decreases, communication path management becomes easier. The amount of memory required for this purpose is sufficient to correspond to the number of physical communication paths, and the memory resources required for setting and opening logical communication paths are also reduced, allowing effective use of memory resources for other purposes. be able to. Therefore, the present invention is more effective as the number of boss 1-dividers in the δ1 computer network increases. Furthermore, the effects of the present invention are most noticeable when the number of data streams to be transmitted is small. In other words, the amount of information stored in each relay device increases, and if it exceeds the reduction in memory resources due to the reduction in the number of logical communication paths, the reduction in memory resources will not result. Therefore, when the conventional method shown in Fig. 1 and the method of the present invention are mixed in one hj computer network and a large amount of data is exchanged between users, the logical communication path cannot be established using the conventional method. It is effective to use the method of the present invention when handling a small amount of data, such as when setting and sending and receiving management information on the system side.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the data transfer method in the conventional total W Mlt network, FIG. 2 is a diagram showing the data transfer method according to the present invention, and FIG.
The figure is a diagram showing the operation of data exchange according to the present invention. In the figure, Δ~F is post meter W, machine, P abs P
Pb! 11. , P cd, P be, and P ef indicate logical communication paths, respectively. Patent applicant Fujitsu Co., Ltd.
Between Nippon Telegraph and Telephone Public Corporations NEC Corporation Hitachi, Ltd. Representative Patent Attorney Minoru AoyagiContinued from page 1 Applicant Nippon Telegraph and Telephone Public CorporationApplicant NEC Corporation 5-33 Shiba, Minato-ku, Tokyo No. 1 @ Applicant Hitachi, Ltd. No. 1, Marunouchi-5-chome, Chiyoda-ku, Tokyo

Claims (1)

[Scope of Claims] When transmitting and receiving data between W machines in a computer network, the system communicates via a plurality of logical communication paths. A computer that transmits data by setting information that identifies the other party's computer selects an appropriate logical communication channel based on the information that identifies the other party's computer, and also transmits the data on the received communication path. The identifiers assigned to the transmitted data, the identifiers assigned to the transmitted data on the communication route to be transmitted, and information indicating the correspondence between the communication channels are stored in memory, while the response to the transmitted data is stored in memory. The W-machine that relays the response knows the logical communication path and identifier to which the response should be sent back from the stored information, sends the response back via the logical communication path, and releases the stored information. 1- Data transfer method in the work.