JPH06216903A - Inter-lan connecting device - Google Patents

Abstract

PURPOSE:To prevent the increase of traffic due to the abnormality of a station of a transmission destination by transmitting data to the station of the LAN of the transmssion destination at the time of discriminating that the pertinent station is present and normally operated. CONSTITUTION:Transmission is requested from the station ST1 of one LAN A to the station ST6 of the other LAN B. In an inter LAN connection device, data are received by a data reception processing part 2, and information of the station ST6 of the transmission destination in a LAN information management part 1 is confirmed by a data transfer control part 4. When it is judged based on address information and state information of the station ST6 that transmission to the station ST6 is permitted, the data transmission processing to the station ST6 of the transmission destination is performed through a data transmission processing part 3 by the control part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for connecting a plurality of local area networks (hereinafter referred to as LANs) to which a plurality of stations are connected, and in particular, between stations on other LANs. The present invention relates to a LAN-to-LAN connecting device that prevents an increase in traffic due to an abnormality in a transmission destination station and reduces an unnecessary load on a transmission source station when performing data transmission processing with the transmission destination station.

[0002]

2. Description of the Related Art Conventionally, in a system in which a plurality of LANs to which a plurality of stations are connected are connected by an LAN connecting device, an arbitrary station connected to an arbitrary LAN is connected to another LAN. When you want to send data to any station
Based on the address information held by the inter-AN connection device, it is determined whether or not the corresponding station exists, and if the corresponding station exists, the data transmission processing is performed to the corresponding station on another LAN. Are doing.

However, when a corresponding station is found and a data transmission process is performed on the station, if the corresponding station at the other end is in a state in which it cannot receive data for some reason, the source station is After performing retry processing,
Somehow try to realize data transmission. Therefore, the traffic on the network increases. At the same time, the destination station attempting to transmit must spend a considerable amount of time on retry processing due to an abnormality in the transmission destination station on another LAN, which is a waste of processing and a load. Becomes heavy.

[0004]

As described above, in the conventional art, when data transmission processing is performed between stations on another LAN, the traffic increases due to the abnormality of the transmission destination station, and at the same time the transmission is performed. There was a problem that unnecessary load on the former station became heavy.

It is an object of the present invention to prevent an increase in traffic due to an abnormality in a transmission destination station when performing data transmission processing between stations on another LAN and to prevent unnecessary load on a transmission source station. It is an object of the present invention to provide an extremely reliable inter-LAN connection device capable of reducing the above.

[0006]

In order to achieve the above object, according to the present invention, in an apparatus for connecting a plurality of LANs to which a plurality of stations are connected, address information of each station on each LAN and LAN information management means for managing status information in real time, data reception processing means for performing data reception processing, data transmission processing means for performing data transmission processing, and any station of any LAN to any other LAN. When a data transmission request is received from the station, the address information and the status information of the LAN station of the transmission destination managed by the LAN information management means are referred to, and the corresponding station exists and operates normally. If it is determined that the data is received, the data is received by the corresponding station on the transmission destination LAN. Constitute a data transmission and reception control means for transmitting and receiving control data to transmit the data transmission processing unit the received data by physical means.

Here, in particular, the LAN according to claim 1 above.
In the inter-connection device, as the data transmission / reception control means, when it is determined that the corresponding station does not exist or is not operating normally, the data is not transmitted to the corresponding station of the LAN of the transmission destination, The data transmission processing means notifies the source station of the fact.

[0008]

Therefore, in the inter-LAN connecting apparatus of the present invention, any station of any LAN can be connected to another LAN.
When transmitting data to any of the stations above, if it is determined that the corresponding station exists and is operating normally by referring to the address information and status information of the LAN of the transmission destination, Data is transmitted to the corresponding station on the previous LAN.

If it is determined that the corresponding station exists on the LAN of the transmission destination but is not operating normally, data transmission is not performed to the corresponding station of the LAN of the transmission destination, and the station of the transmission source To that effect, the data transmission processing means notifies that fact.

This makes it possible to manage the status of the stations on the LAN and perform optimum control of data transmission, so that unnecessary increase in traffic can be prevented and the transmission source The station can take appropriate measures promptly and reduce unnecessary load. Therefore, highly efficient LAN-to-LAN transmission can be performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram showing an example of the overall configuration of a system to which the LAN connecting device according to the present invention is applied. In FIG. 2, a plurality of (five in this example) stations ST-1, ST-2, ST-3, ST-4, ST-
5, ST-6, ST-7, ST-8, ST-9, ST-
Multiple LANs (two in this example) to which 10 are connected-
The LAN connection device 10 of this embodiment connects between A and B.

FIG. 1 is a block diagram showing an example of the internal configuration of the inter-LAN connecting device 10. That is, as shown in FIG. 1, the LAN-to-LAN connection device of the present embodiment has a LAN information management unit 1, a data reception processing unit 2, and a data transmission processing unit 3.
And a data transmission / reception control unit 4.

Here, the LAN information management unit 1 is configured to
-Stations ST-1 and ST-2 on A and B
ST-3 / ST-4 / ST-5 / ST-6 / ST-7 /
The address information and the status information of ST-8, ST-9, and ST-10 are managed in real time, for example, as a table as shown in FIG. In addition, the data reception processing unit 2 performs a data reception process. Furthermore, the data transmission processing unit 3 performs a data transmission process.

Furthermore, the data transmission / reception control unit 4 is provided with an arbitrary station ST-1 of an arbitrary LAN-A or B.
・ ST-2 ・ ST-3 ・ ST-4 ・ ST-5 or ST
-6, ST-7, ST-8, ST-9, ST-10 to any other station ST-6 of LAN-B or A
・ ST-7 ・ ST-8 ・ ST-9 ・ ST-10 or S
Upon receiving a data transmission request to T-1, ST-2, ST-3, ST-4, ST-5, the LAN-B or A of the transmission destination managed by the LAN information management unit 1 is received. Stations ST-6, ST-7, ST-8, ST
-9, ST-10 or ST-1, ST-2, ST-3
-When it is determined that the corresponding station exists and is operating normally by referring to the address information and the status information of ST-4 and ST-5, the corresponding station of LAN-B or A of the transmission destination is The data reception processing unit 2
A function of controlling transmission / reception of data so that the data received by the data transmission processing unit 3 is transmitted, and when it is determined that the corresponding station does not exist or is not operating normally, the transmission destination LAN-B Or A
Data is not transmitted to the corresponding station in
The data transmission processing unit 3 has a function of notifying the transmission source station of the fact.

Next, the operation of the present embodiment configured as described above will be described. Here, one LAN-
A case where data is transmitted from the station ST1 of A to the station ST6 of the other LAN-B will be described as an example. In FIG. 2, one station ST1 of LAN-A makes a transmission request to ST6 of LAN-B.

In the LAN-to-LAN connecting device 10, the data reception processing section 2 receives the data, and the data transmission / reception control section 4
Thereby, the information of the corresponding station ST6 of the transmission destination of the LAN information management unit 1 is confirmed. Then, when it is determined that the data may be transmitted to the corresponding station ST6 based on the address information and the status information of the station ST6, the data transmission / reception control unit 4 to the data transmission processing unit 3
Through, the data transmission process is performed to the corresponding station ST6 of the transmission destination.

When the data transmission / reception control unit 4 determines that the corresponding station ST6 exists on the LAN-B of the transmission destination but is not operating normally, the data transmission to the corresponding station ST6 is performed. Is not done,
The transmission source station ST1 is notified of that fact through the data transmission processing unit 3. When it is determined that the corresponding station is not operating normally, the fact is notified to the transmission source station.

The station status information in the LAN information management unit 1 shown in FIG. 3 is the station ST-1, ST-2, ST-3 connected to each LAN-A, B.
・ ST-4 ・ ST-5, ST-6 ・ ST-7 ・ ST-8
When ST-9 and ST-10 start up, the LAN inter-connector 10 is notified that it has started up normally, and the status information corresponding to its own station in the LAN information management unit 1 is registered as normal.

Further, any station ST-1, ST-2, ST-3, ST-4 on a certain LAN-A or B.
・ ST-5 or ST-6 ・ ST-7 ・ ST-8 ・ ST
-9. When data transmission processing is performed at ST-10, the LAN information management unit 1 in the LAN connection device 10 determines that the corresponding station is normal, and when data transmission processing is performed to the corresponding station, If the station is not operating normally for some reason, the LAN-to-LAN connecting device 10 determines that the data transmission process is not normally performed on the station, and the LAN information management unit 1 updates the status information to be abnormal. Then, the fact is notified to the transmitting station.

As a result, thereafter, until the station returns to the normal state, the LAN connection device 10 can determine the station abnormality and prevent unnecessary increase of traffic.

As described above, in this embodiment, the five stations ST-1, ST-2, ST-3, ST-4.
ST-5, ST-6, ST-7, ST-8, ST-9.
An inter-LAN connecting device for connecting between two LANs A and B to which ST-10 is connected is provided as stations ST-1, ST-2, ST-3, ST on each LAN-A, B.
-4 / ST-5, ST-6 / ST-7 / ST-8 / ST
LAN information management unit 1 that manages address information and status information of ST-9 and ST-10 in real time, data reception processing unit 2 that performs data reception processing, data transmission processing unit 3 that performs data transmission processing, Any LAN-A or B any station ST-1, ST-2, ST
-3 ・ ST-4 ・ ST-5 or ST-6 ・ ST-7 ・
From ST-8 / ST-9 / ST-10 to any station of LAN-B or A ST-6 / ST-7 / ST
-8 / ST-9 / ST-10 or ST-1 / ST-2
Upon receiving a data transmission request to ST-3, ST-4, and ST-5, the station ST-6, ST of LAN-B or A of the transmission destination managed by the LAN information management unit 1 -7 / ST-8 / ST-9 / ST-10
Or ST-1, ST-2, ST-3, ST-4, ST
If it is determined that the corresponding station exists and is operating normally by referring to the address information and the status information of -5, the data reception processing unit is transmitted to the corresponding station of the transmission destination LAN-B or A. A function of controlling transmission / reception of data so that the data received in 2 is transmitted by the data transmission processing unit 3, and if it is determined that the corresponding station does not exist or is not operating normally, the LAN- The data transmission / reception control unit 4 has a function of not transmitting data to the corresponding station B or A and notifying the transmission source station of the fact by the data transmission processing unit 3.

Therefore, the LAN connecting device 10 is connected to the LAN
-Stations ST-1, ST-2, S on A and B
T-3, ST-4, ST-5 or ST-6, ST-7
By having the status information as well as the address information of ST-8, ST-9, and ST-10, when performing the data transmission processing between stations on another LAN, the LAN-
Since the control of the transmission processing of the data passing between A and B can be performed more reliably and promptly, it is possible to prevent the unnecessary increase of traffic.

At the same time, since appropriate processing can be performed at the transmission source station, it becomes unnecessary to perform unnecessary processing at the transmission source station, and unnecessary load can be reduced. . As described above, extremely efficient transmission between LAN-A and B can be performed. The present invention is not limited to the above embodiment, but can be implemented in the same manner as described below.

(A) Each station monitors the stations before and after itself to collect the status information of the stations on each LAN-A and B managed in the inter-LAN connecting device 10, and the status information is collected between the LANs. By performing processing such as notifying the connection device 10, it becomes possible to perform more timely data transmission control.

(B) In the above embodiment, the case where the present invention is applied to an inter-LAN connecting device for connecting two LANs has been described. However, the present invention is not limited to this, and three or more LAs are connected.
The present invention can be similarly applied to the case of a LAN-to-LAN connecting device that simultaneously connects N terminals. Then, in this case, a more remarkable effect can be obtained as compared with the case described above.

(C) In the above embodiment, the case where data is transmitted from the station of LAN-A to the station of LAN-B has been described, but the present invention is not limited to this.
Conversely, from any station on LAN-B to LAN-A
The present invention can be similarly applied to the case of performing data transmission to any station.

(D) In the above embodiment, when the data transmission / reception control unit 4 determines that the corresponding station does not exist or is not operating normally, the data is sent to the corresponding station of the LAN of the transmission destination. Notifying the source station of the fact without transmission is not an essential function of the present invention.

[0029]

As described above, according to the present invention, in a device for connecting a plurality of LANs to which a plurality of stations are connected, the address information and the status information of each station on each LAN are real-time. Manage and from any station on any LAN to another LAN
When a data transmission request is received from any of the stations, the address information and status information of the transmission destination LAN station managed by the LAN information management means are referred to, and the corresponding station exists and is normal. If it is determined to be operating in the
Since the data is transmitted to the corresponding station of No. 2, when the data transmission processing is performed between the stations on the other LAN, the increase of the traffic due to the abnormality of the destination station is prevented and the transmission source is An extremely reliable inter-LAN connecting device capable of reducing unnecessary load on the station can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a LAN-to-LAN connecting device according to the present invention.

FIG. 2 is a block diagram showing an example of the overall configuration of a system to which an inter-LAN connecting device according to the present invention is applied.

FIG. 3 is a diagram showing an example of management information by a LAN information management unit in the LAN connection apparatus of the embodiment.

[Explanation of symbols]

1 ... LAN information management unit, 2 ... Data reception processing unit, 3 ... Data transmission processing unit, 4 ... Data transmission / reception control unit, 10 ... LA
N-to-N connecting device, ST-1, ST-2, ST-3, ST-
4, ST-5, ST-6, ST-7, ST-8, ST-
9, ST-10 ... Station, A, B ... LAN.

Claims (2)

[Claims] 1. An apparatus for connecting between a plurality of LANs to which a plurality of stations are connected, comprising: LAN information management means for managing address information and status information of each station on each LAN in real time; Data reception processing means for performing reception processing, data transmission processing means for performing data transmission processing, and from any station of the arbitrary LAN to another LAN
When receiving a data transmission request to any of the stations, the address information and the status information of the LAN station of the transmission destination managed by the LAN information management means are referred to, and the corresponding station exists and When it is determined that the data is normally operating, data for controlling data transmission / reception so that the data received by the data reception processing means is transmitted by the data transmission processing means to the corresponding station of the transmission destination LAN. An inter-LAN connection device comprising: a transmission / reception control means. 2. The inter-LAN connection device according to claim 1, wherein the data transmission / reception control means determines that the transmission destination of the transmission destination is the corresponding station if the station does not exist or is not operating normally. An inter-LAN connecting device characterized in that data is not transmitted to a corresponding station of a LAN, and the data transmission processing means notifies the station of the transmission source of the fact.