JPH0846636A - Inter-lan connector - Google Patents

Abstract

PURPOSE:To relieve the transmission load of a trunk LAN and a branch LAN by preventing it that an undesired data frame is received by the branch LAN or sent to the trunk LAN in the interLAN connector. CONSTITUTION:The connector is provided with a receiver side information registration table 102 to register information for the selective reception based on a specific part of a data frame when the data frame is received from a trunk LAN 100 to a branch LAN 108, a means conducting the selective reception by the specific part of the data frame based on the receiver side information registration table 102, a sender side information registration table 105 registering the information for the selective transmission based on the specific part when the data frame is sent from the branch LAN 108 to the trunk LAN 100, and a means conducting the selective transmission by the specific part of the data frame based on the sender side information registration table 105.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-LAN connecting device which accommodates a branch LAN and constitutes a backbone LAN.

[0002]

2. Description of the Related Art Conventionally, in a LAN-to-LAN connecting device which accommodates a plurality of branch LANs in a backbone LAN, when a destination address of a data frame is a broadcast, all of them are often passed. This is because it is necessary to transfer the data frame to all branch line LANs accommodated in the backbone LAN because the receiver of the data frame cannot be specified. Therefore, when a computer connected to the branch line LAN uses a specific part of the data frame to perform selective reception, even a data frame that does not require a computer connected to the branch line LAN passes through the LAN-to-LAN connection device and is connected to the branch line LAN. Be received. Further, even a data frame required only in the branch LAN passes through the inter-LAN connecting device and is transmitted to the backbone LAN.

[0003]

In the conventional inter-LAN connecting device, when the destination address of the data frame is broadcast, even a data frame which does not require a computer connected to the branch LAN passes through the inter-LAN connecting device and the branch line L.
Since the data is received by the AN, there is a drawback that unnecessary data frames flow to the branch line LAN, resulting in useless traffic. Further, even a data frame required only in the branch LAN passes through the inter-LAN connecting device and is transmitted to the backbone LAN, so that there is a disadvantage that unnecessary data frames flow to the backbone LAN, resulting in useless traffic.

It is an object of the present invention to prevent an unnecessary data frame from being received by a branch LAN or transmitted to a backbone LAN, and to reduce the transmission load between the backbone LAN and the branch LAN, which is a LAN connecting device. To provide.

[0005]

In order to achieve the above object, the present invention provides a registration table for a computer to selectively receive a data frame by using a specific portion of the data frame having a broadcast address, and the registration. A means for the computer to selectively receive the data frame using a table, and a branch LAN that supports the communication method of each computer, and a backbone LAN
In the LAN-to-LAN connecting device constituting the above, when a data frame is received from a backbone LAN to a branch LAN, a receiving side information registration table for registering information for selective reception by the specific portion, and specification of the data frame Means for performing selective reception by part based on the reception side information registration table; and a transmitting side for registering information for selective transmission by the specific part when the data frame is transmitted from the branch LAN to the backbone LAN. An information registration table, a means for performing selective transmission by a specific portion of the data frame based on the transmission side information registration table, and the reception side information registration table is connected to a branch line LAN accommodated in an inter-LAN connecting device. Read the registration table of each computer and configure it by the union of the registration tables And a registration table of each computer connected to a branch LAN that is housed in another LAN inter-connector that constitutes the backbone LAN, and the transmission side information registration table is read by the union of the registration tables. And a means for constituting the same.
Here, the reception side information registration table may be written and set from a specific computer connected to the branch LAN accommodated in the backbone LAN. In this case, the contents of the receiving side information registration table are preset in the computer by the system administrator.

The sender information registration table is a backbone LAN.
It may be set by writing from a specific computer connected to the branch line LAN accommodated in. In this case, the contents of the transmission side information registration table are set in the computer in advance by the system administrator. The reception side information registration table may be individually written and set from a computer connected to a branch line LAN accommodated in the inter-LAN connecting device. In this case, the reception side information registration table is reset so as to be a union of the written registration tables. The transmission side information registration table may be individually written and set by each computer connected to the branch line LAN accommodated in the other inter-LAN connecting device that constitutes the backbone LAN. In this case, the sender information registration table is reset so that it is a union of the written registration tables.

[0007]

When the data frame is received from the backbone LAN to the branch LAN, a reception side information registration table for registering information for selective reception by the specific portion of the data frame, and selection by the specific portion of the data frame Means for performing reception based on the reception side information registration table, and a transmission side information registration table for registering information for selective transmission by the specific part when the data frame is transmitted from the branch LAN to the backbone LAN And means for performing selective transmission of the specific portion of the data frame based on the transmission side information registration table, so as to connect to the branch LAN when the data frame is received from the backbone LAN to the branch LAN. Computer can selectively receive unnecessary data frames and discard them, so branch line LAN It is possible to prevent the flow of unnecessary data frame. Further, since it is possible to selectively transmit and discard the necessary data frames only within the branch LAN, it is possible to prevent unnecessary data frames from flowing to the backbone LAN.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a system including an inter-LAN connecting device of this embodiment. In Figure 1, the backbone LAN100
Between LAN connection device 1: 101, LAN connection device 2: 1
14, LAN-to-LAN connecting device n: 119 is configured by a plurality of LAN-to-LAN connecting devices. The branch LAN 1: 108 is the LAN connection device 1: 101, the branch LAN 2: 115 is the LAN connection device 2: 114, and the branch LAN n: 120 is the LAN connection device n: 119, respectively, the backbone LAN 100.
It is housed in.

The branch line LAN1: 108 is a computer 1-1: 1.
09, computers 1-2: 112, and computers 1-n: 113 are interconnected. Branch line LAN 2:11
Reference numeral 5 interconnects a plurality of computers such as computer 2-1: 116, computer 2-2: 117, and computer 2-n: 118. The branch line LANn: 120 interconnects a plurality of computers such as computer n-1: 121, computer n-2: 122, and computer n-n: 123.

The inter-LAN connecting device 1: 101 refers to the reception side information registration table 102 by the selective reception processing means 104 and selectively receives the data frame received from the backbone LAN 100. The receiving side information registration table 102 is set by the receiving side information registration table setting means 103.

The setting means includes (1) a case in which the LAN-to-LAN connecting device reads out a computer registration table necessary for setting the reception side information registration table, and (2) each computer stores the registration table. There is a case where it is performed by transmitting it to the LAN-to-LAN connecting device and a case where (3) it is performed by writing from a specific computer.

The LAN-to-LAN connecting device 1: 101 refers to the transmission side information registration table 105 by the selective transmission processing means 107 and selectively transmits the data frame received from the branch line LAN 108. The sender information registration table 105 is set by the sender information registration table setting means 106.

The setting means includes (1) a case where the inter-LAN connecting device reads out the computer registration table necessary for setting the transmission side information registration table, and (2) each computer stores the registration table. There is a case where it is performed by transmitting it to the LAN-to-LAN connecting device and a case where (3) it is performed by writing from a specific computer.

The computers 1-1: 109 refer to the registration table 110 by means of the selective reception processing means 111 to selectively receive the data frame received from the branch line LAN 108. Computers existing in other systems operate similarly.

FIG. 2 shows the structure of a data frame transmitted and received in this embodiment.

In FIG. 2, the data frame 200 is composed of a destination address 201, a source address 202, a selection code 203, and transmission information 204. The destination address 201 of the data frame is broadcast. The source address 202 indicates the computer that transmitted the data frame. The selection code 203 is expressed by an arbitrary numerical value within a predetermined range. The transmission information 204 indicates arbitrary information transmitted and received.

FIG. 3 shows the structures of the receiving side information registration table 102, the transmitting side information registration table 105, and the registration table 110 in this embodiment.

In FIG. 3, the table 300 is represented as a set of processes corresponding to the selection code. Here, when the process is 1, it indicates that the data frame having the corresponding selection code is received or transmitted. When the processing is 0, it indicates that the data frame having the corresponding selection code is discarded. For example, since the processing is 1 in the table 301, the data frame having the selection code 1 is set to the branch line LA.
LAN-to-LAN connection device received from N or backbone LAN
Receive on the branch LAN or send to the backbone LAN. Also,
Since the processing is 0 in the table 302, the selection code 2
The data frame with is discarded.

FIG. 4 shows a computer 1 connected to a branch LAN.
It is a figure explaining operation | movement of the selective reception processing means 111 of 09.

In FIG. 4, the selective reception processing means 111 of the computer 109 performs selective reception with a selective code when a data frame arrives from the branch line LAN 108 (401, 4).
02). The registration table 110 is referred to (403), and if the process corresponding to the selection code is 1, the data frame is received (404). If the process corresponding to the selection code is 0, the data frame is discarded (405).

FIG. 5 is a diagram for explaining the operation of the selective reception processing means 104 of the LAN-to-LAN connecting device 101.

In FIG. 5, the selective reception processing means 104 of the LAN-to-LAN connecting device 101 performs selective reception by a selective code when a data frame is received from the backbone LAN 100 (501, 502). The receiving side information registration table 102 is referred to (503). If the process corresponding to the selection code is 1, the data frame is received and sent to the branch line LAN (504). If the process corresponding to the selection code is 0,
The data frame is discarded (505).

FIG. 6 is a diagram for explaining the operation of the selective transmission processing means 107 of the LAN-to-LAN connecting device 101.

In FIG. 6, the selective transmission processing means 107 of the LAN-to-LAN connecting device 101 performs selective transmission by a selection code when a data frame is received from the branch LAN 108 (601, 602). With reference to the transmission side information registration table 105 (603), if the process corresponding to the selection code is 1, the data frame is transmitted and sent to the backbone LAN (604). If the process corresponding to the selection code is 0,
The data frame is discarded (605).

7, 8 and 9 show the receiving side information registration table setting means 103 of the LAN connecting device 1: 101.
FIG. 7 is a diagram illustrating the operation of FIG. There are three setting means. Hereinafter, they will be described in order.

First, referring to FIGS. 7 and 9, a case will be described in which the registration table of each computer connected to the branch line LAN 108 accommodated by the inter-LAN connecting device 1: 101 is read and the reception side information registration table 102 is set. .

In FIGS. 7 and 9, the LAN-to-LAN connection device 1: 101 is a computer 109 connected to the branch line LAN102.
From 112 and 113, registration tables 110, 901 and 90
2 is read (701). Next, a union of the read registration tables is created (702) and the receiving side registration table 102 is created.
(703).

Here, the receiving side information registration table setting means 103 operates in response to an instruction from any computer connected to the branch LAN accommodated in the backbone LAN 100,
It may operate when the power of the LAN-to-LAN connecting device 101 is turned on.

Next, referring to FIGS. 8 and 9, each computer connected to the branch line LAN1: 108 housed in the inter-LAN connecting device 1: 101 transmits the registration table to the inter-LAN connecting device 1: 101. The case of setting the reception side registration table 102 will be described.

8 and 9, the branch line LAN 1: 1
Each computer 109, 112, 1 connected to 08
13 sends the registration table 110, 901, 902 as the transmission information of the data frame. The data frame used as the transmission information has a special selection code, for example, 0, and is distinguished. L receiving the registration table
The inter-AN connection device 1: 101 (801) creates a union of the receiving side information registration table 102 and the incoming registration table (802), and resets the receiving side information registration table 102 (803).

When writing to the receiving side information registration table 102 from a specific computer, the receiving side information registration table setting means 103 directly sets the incoming registration table to the receiving side information registration table.

10, 11, and 12 show the transmitting side information registration table setting means 10 of the LAN connecting device 1: 101.
It is a figure explaining operation | movement of 6. There are three setting means. Hereinafter, they will be described in order.

First, referring to FIGS. 10 and 12, the LAN
Inter-connection device 1: 101 is another LA that constitutes the backbone LAN 100
A case where the registration table of each computer connected to the branch LAN accommodated in the N-to-N connection device is read and the transmission side information registration table 105 is set will be described.

In FIGS. 10 and 12, the LAN connecting device 1: 101 is a branch line LAN2: 115, a branch line accommodated in another LAN connecting device 2: 114 and a LAN connecting device n: 119 constituting the backbone LAN 100. Computers 116, 117, 118, 121, connected to the LANn: 120
122, 123 to registration tables C01, C02, C0
3, C04, C05 and C06 are read (A01). Next, a union of the read registration tables is created (A0
2) Set in the transmission side registration table 105 (A03).

Here, the transmitting side information registration table setting means 106 operates in response to an instruction from any computer connected to the branch line LAN accommodated in the backbone LAN 100,
It may operate when the power of the LAN-to-LAN connecting device 101 is turned on.

Next, referring to FIG. 11 and FIG. 12, another LAN in which the LAN-to-LAN connecting device 1: 101 constitutes the backbone LAN 100
Inter-connector 2: 114, LAN inter-connector n: 119, branch line LAN2: 115, branch line LANn: 12
Each computer connected to
A case of setting the transmission side information registration table by transmitting to the N-to-N connection device 1: 101 will be described.

11 and 12, each computer 11 connected to the branch line LAN accommodated by the inter-LAN connecting device 2: 114 and the inter-LAN connecting device n: 119.
6, 117, 118, 121, 122, 123 are registration tables C01, C02, C03, C04, C05, C06.
Is sent. L that received the registration table from the backbone LAN
The inter-AN connection device 1: 101 (B01) creates a union of the sender information registration table 105 and the incoming registration table (B02), and resets the sender information registration table 105 (B03).

When writing to the transmission side information registration table 105 from a specific computer, the reception side information registration table setting means 103 directly sets the incoming registration table to the reception side information registration table.

FIG. 13 is a diagram for explaining the flow of the registration table 110 sent from the computers 1-1: 109 when each computer transmits the registration table to each LAN-to-LAN connecting device.

In FIG. 13, the registration table 110 sent from the computer 1-1: 109 as the transmission information of the data frame arrives at the LAN-to-LAN connecting device 1: 101 via the branch line LAN1: 108. Branch line LAN1: 108
The incoming registration table 110 forms a union with the receiving side information registration table 102 and is reset. The data frame that has the registration table 110 as transmission information is the backbone
It is sent to LAN100. LA that received a data frame having the registration table 110 as transmission information from the backbone LAN
N-to-N connecting device 2: 114 and LAN-to-LAN connecting device n: 1
Reference numeral 19 is a transmission side information registration table E02, E04, respectively.
It forms a union with and is reset. According to the present embodiment, in the LAN-to-LAN connecting device, it is possible to prevent unnecessary data frames from being received by the branch line LAN or transmitted to the backbone LAN, and it is possible to reduce the load on the backbone LAN and the branch LAN.

Further, (1) the LAN-to-LAN connecting device reads out the registration table of each computer necessary for the receiving side information registration table or the transmitting side information registration table to read out the transmitting side information registration table and the receiving side information registration table. When setting the information registration table, and (2) when each computer sets the transmission side information registration table and the reception side information registration table by transmitting the registration table to each LAN connection device. According to this, it is possible to minimize the load on the branch LAN and the backbone LAN. This is because only the selection code required by the computer connected to the branch LAN is set in the reception side information registration table, and the selection code stored in the inter-LAN connection device via the backbone LAN in the transmission side registration table. This is because only the selection code required by the computer connected to the branch LAN is set.

[0043]

According to the present invention, in the inter-LAN connecting device, it is possible to prevent unnecessary data frames from being received by the branch line LAN or transmitted to the backbone LAN, and the backbone L
It is possible to reduce the transmission load of the AN and the branch line LAN.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a LAN connecting device and a system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a structure of a data frame according to the embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a registration table, a reception side information registration table, or a transmission side information registration table according to the embodiment of the present invention.

FIG. 4 is a diagram showing an operation of selective reception processing means of the computer according to the embodiment of the present invention.

FIG. 5 is a diagram showing an operation of selective reception processing means of the inter-LAN connecting device of the embodiment of the present invention.

FIG. 6 is a diagram showing an operation of a selective transmission processing means of the inter-LAN connecting device of the embodiment of the present invention.

FIG. 7 is a diagram showing an operation when reading a registration table from each computer connected to a branch line LAN of the receiving side information registration table forming means of the inter-LAN connecting device of the embodiment of the present invention.

FIG. 8 is a diagram showing an operation when a registration table is received from a branch line LAN of a receiving side information registration table forming means of the inter-LAN connection device according to the embodiment of the present invention.

FIG. 9 is a diagram for explaining the operation when reading the registration table from each computer connected to the branch line LAN of the receiving side information registration table forming means of the LAN-to-LAN connecting device according to the embodiment of the present invention.

FIG. 10 is registered by each computer connected to a branch line LAN accommodated in another LAN inter-connection device via the backbone LAN of the transmission side information registration table forming means of the inter-LAN connection device of the embodiment of the present invention. It is a figure which shows operation | movement at the time of reading a table.

FIG. 11 is a diagram showing an operation when the registration table is received from the backbone LAN of the transmission side information registration table forming means of the inter-LAN connection device according to the embodiment of the present invention.

FIG. 12 is registered from each computer connected to a branch line LAN accommodated in another LAN inter-connection device via the backbone LAN of the transmission side information registration table forming means of the LAN inter-connection device of the embodiment of the present invention. It is a figure for demonstrating operation | movement at the time of reading a table.

FIG. 13 is a diagram for explaining the flow of the registration table 110 sent from the computers 1-1: 109 when each computer according to the embodiment of the present invention performs the registration table by transmitting the registration table to each LAN connection device. FIG.

[Explanation of symbols]

100 ... Basic LAN, 101 ... LAN connecting device, 10
2 ... Receiving side information registration table, 103 ... Receiving side information registration table setting means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakazu Okada 5-2-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Omika factory (72) Inventor Hiroshi Tomizawa 5-chome, Omika-cho, Hitachi-shi, Ibaraki No. 1 Incorporated company Hitachi Ltd. Omika factory (72) Inventor Hideo Otani 5-2-1, Omika-cho, Hitachi-shi, Ibaraki Hitachi Process Computer Engineering Co., Ltd. (72) Kunihito Kataoka Omika, Hitachi-shi, Ibaraki 5-2-1, Machi Hiritsu Process Computer Engineering Co., Ltd.

Claims (7)

[Claims] 1. A registration table for a computer to selectively receive the data frame by using a specific portion of the data frame having a broadcast address, and a means for the computer to selectively receive the data frame by using the registration table. In a LAN-to-LAN connecting device that accommodates a branch LAN that supports the communication method of each computer and forms a backbone LAN, when the data frame is received from the backbone LAN to the branch LAN, selective reception by the specific portion is performed. A LAN-to-LAN connecting device, comprising: a receiving side information registration table for registering information for performing the above; and means for selectively receiving a specific portion of the data frame based on the receiving side information registration table. 2. The transmission side information registration table for registering information for performing selective transmission by the specific part when transmitting the data frame from a branch LAN to a backbone LAN according to claim 1, Means for performing selective transmission by a specific portion based on the transmission side information registration table. 3. The reception information registration table according to claim 1, wherein a registration table of each computer connected to a branch line LAN accommodated in the inter-LAN connecting device is read, and a union of the registration tables is performed. An inter-LAN connecting device, comprising: means for configuring. 4. The registration table of each computer connected to a branch line LAN accommodated in another LAN-to-LAN connecting device which constitutes a backbone LAN according to claim 1, wherein the transmission side information registration table is read, Means for constructing a union of the registration tables. 5. The inter-LAN connection device according to claim 1, further comprising means for writing and setting the reception side information registration table from a computer connected to a branch LAN accommodated in a backbone LAN. 6. The inter-LAN connection device according to claim 1, further comprising means for writing and setting the transmission side information registration table from a computer connected to a branch LAN accommodated in a backbone LAN. 7. The means according to claim 1, wherein the computer sends the information about the registration table to the branch line LAN, and the inter-LAN connecting device receives the information about the registration table from the branch line LAN, A means for forming a union of the reception side information registration table and the registration table and resetting the reception side registration table; and, when the LAN-to-LAN connecting device receives information regarding the registration table from the backbone LAN, the transmission side An inter-LAN connection device comprising: an information registration table and means for forming a union of the registration tables and resetting the registration table on the transmission side.