JPS61123232A - Addressing system of local area network system - Google Patents

Abstract

PURPOSE:To attain the ease of the correction of an address list by providing an address server storing the address data of all terminal stations to each local area network sub system so as to retrieve the address server. CONSTITUTION:Plural local area network sub systems LAN1-LANn are connected via node stations N1, N2-. The sub systems LAN1-LANn are provided respectively with plural terminal stations S11-S1m,-,Sn1-Snm and address servers S1A-SnA, and each address server stores a list for sub system names belonging to all terminal stations are addresses specific to each terminal station. When the address of an opposite terminal station desired for transmission is not clear to a terminal station, the address server is retrieved and the data is transmitted after the opposite address is obtained. Thus, the memory area of each terminal station is saved and the correction jib of the address table at increase/decrease in the terminal station attended with the system change is simplified.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a local area network system, and in particular to a destination addressing method in a local area network system in which a plurality of local area network systems are interconnected. be.

[Conventional technology]

Conventionally, in the destination addressing control method in this type of local area network system, each terminal station connected to the local area network subsystem had to hold the destination addresses of all terminal stations.

[Problem that the invention seeks to solve]

Therefore, each time a local area network subsystem is added or a terminal station within the local area network subsystem is added, all terminal stations of the local area network system will be given the name of the newly added local area network subsystem. and terminal station name must be memorized again. in this way.

With conventional destination addressing methods, system expansion,
Every time there is a deletion, etc., the contents of the destination address table of all terminal stations must be updated.

The disadvantage was that it lacked flexibility in system operation.

[Failure to solve the problem]

The purpose of the present invention is to provide one terminal station of each local area network subsystem with an address server function, and only the address server updates the destination address table of the address server in response to an increase or decrease in the number of local area network subsystems or an increase or decrease in the number of terminal stations. In this way, each terminal station queries the address server for the local area network subsystem name of the destination address only when the destination address is unknown, thereby eliminating the above drawback and increasing or decreasing the number of local area network subsystems.

Another object of the present invention is to provide an addressing system in a local area network that enables flexible destination addressing in response to an increase or decrease in the number of terminal stations.

According to the invention, a plurality of terminal stations are connected to each local area network subsystem.

In a local area network system in which local area network subsystems are interconnected, each local area network subsystem is connected to which local area network subsystem all terminal stations connected to the local area network are connected. each of the end stations connected to the local area network subsystem has address server means for storing whether the local area network subsystem is connected to the local area network subsystem;

means for storing a destination local area network subsystem name and an address of a terminal station connected to the destination local area network subsystem, and each of said terminal stations, when the destination local area network subsystem is unknown, to said address server means of said local area network to which said terminal station is connected;

An addressing method for a local area network system is obtained, which is characterized by inquiring which local area network subsystem a terminal station to which transmission is connected is connected.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, in one embodiment of the present invention.

Multiple local area network subsystems LAN
1 (i=1.-, n) is a node station,
Ni (+=1.2...., n-1) are connected to each other via each of the addresses in FIG. LAN name (I, ANi) and terminal name (stj)
and a unique address name (Si).

Figure 3 shows the contents of the terminal station address table stored in the memory (not shown) in each terminal station, Figure 3 (a) shows the initial state, and Figure 3 (b) queries the address server. Shows the state after

Figure 4 shows the LAN from terminal station S21 of LAN2 shown in Figure 1.
, shows a mechanism for transmitting a message to the terminal station S32 of .

FIG. 5 shows the message 7-man output in the case of FIG. 4, and the terminal station S2. , from address server SEA et al. terminal station S32
The format of the message sent to is indicated by ■.

The operation when transmitting a message from the terminal station S21 to the terminal station S32 in FIG. 4 will be explained with reference to FIGS. 2, 5, and 5. Since the initial state of the terminal address table of the terminal station S21 is the state shown in FIG. 3 (,), the terminal station S3t
Since it is unknown to which local area network subsystem the terminal station SSt is connected, the terminal station S21 inquires of the address server S2A about the unique address of the terminal station SSt in the message format shown in (■) in FIG. Here, S2A of ■ in Fig. 5 is the destination address name of the message of ■, S21 is the address salt of the message sender, JULL
indicates the contents of Don't Care, and s and 2 indicate the final destination address of the data in ■. When the address server SEA receives the message (■), it selects the LAN number (LAN number) corresponding to the terminal station S32 from the destination station table shown in FIG.
3) and the unique address Si+1,
The address server S2A sends the terminal station St+
Send it back in message format. Terminal station SZt is terminal station SZ
The contents of the terminal station address table in + for terminal station S32 are updated as shown in Figure 3 (b), and terminal station SZ+ sends the message data to LAN, in the message format of ■ in Figure 5.
and sends it to the terminal station 53jl on the LAN. Terminal S
After the 4-station station table of 21 is updated as shown in FIG. 3(b), when the terminal station S2+ wants to send the second message to the terminal station S32, the terminal station S21 sends the second message to the terminal station S32.

Examine the terminal station table in terminal 4Szt. The terminal station Stacy Mino is already on the table.

Since the LAN of the terminal station SSt and 81+1 are registered.

For the second and subsequent messages, the terminal station St+ omits the above procedure of inquiring the address server SEA, and sends the message data in the message format shown in Figure 5 (■).
Send within LAN2, LAN.

Send it to the terminal station S engineer.

A flow chart of the operation of the terminal station 821 explained above is shown in FIG.

The above method applies even when a message is transmitted from the terminal station of LAN in FIG. 4 to the terminal station of LAN4.

The same can be adopted. That is, the terminal station So+ of LAN
When you want to send a message from LAN4 to terminal station S43, LAN terminal station S21 sends the message ■, in Figure 5 using the same method as above.
■, ■, and send the LAN, node station (
The node processor N3 receives the message (■), and the node processor N (node processor) sends the message (■) to the terminal station 843 of the LAN4.

Further, although the above LAN is a loop-type local area network subsystem in FIGS. 1 and 4, even if the LAN is a branch network-type local area network subsystem, the addressing of the present invention method can be adopted.

〔Effect of the invention〕

As described above, according to the present invention, the address names of all terminal stations are held in the address server of each local area network subsystem (LAN).

Since each terminal station inquires of the address server only when the final destination address is unknown, it is possible to operate the system flexibly with respect to increases and decreases in local area network subsystems and in addition and decreases in the number of terminal stations.

p1 bottom margin

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a system configuration of an embodiment of the present invention. LANn indicates a local area network subsystem, and SiA is an address server for the local area network subsystem LAN1. Sij is Local Area Network Subsystem LA
It shows a terminal station connected to N1, and Ni shows a node station that connects LAN1 and LAN1+1. FIG. 2 is a diagram showing the contents of the destination station table stored in the memory within the address server SiA. FIG. 3 is a diagram showing the contents of the terminal address table stored in the memory in the terminal station Sij, where (a) shows its initial state and (b) shows its updated state. FIG. 4 is a diagram showing the flow of a message when a message is transmitted from the terminal station S21 to the terminal station S32 in FIG. FIG. 5 is a diagram showing a message format corresponding to the message flow of FIG. 4. FIG. 6 is a flowchart showing the operation of the terminal station S21 in FIG. Figure 2 (Q'J (b> Figure 3 Oe.

Claims (1)

[Claims] 1. In a local area network system in which a plurality of terminal stations are connected to each local area network subsystem and the local area network subsystems are interconnected, each of the local area network subsystems is connected to the local area network subsystem. comprising address server means for storing which local area network subsystem all terminal stations connected to the network are connected to, and each terminal station connected to the local area network subsystem: means for storing information indicating a destination local area network subsystem and information indicating a terminal station connected to the destination local area network subsystem; If the terminal station is connected to a local area network, the address server means of the local area network to which the terminal station is connected is asked which local area network subsystem the terminal station to which the desired transmission is connected is connected. System addressing scheme.