JPH02272841A - Address information storage system - Google Patents

Abstract

PURPOSE:To make storage areas to necessary minimum sizes by limiting only to address information of a terminal which communication with a data communication processor among address information of the terminals so as to store it. CONSTITUTION:Respective data communication processors 210-230 have terminal address tables stored in own processors 201 and terminal tables stored in other processors 202, and they control the destinations of the frames of the terminals. At the time of receiving the frames from a local area network, respective data processors 210-230 store originating source addresses(SA) as terminal addresses stored in own processors as they are. When the frames are received from an internal system bus, SA in stored as terminal addresses stored in other processors only limited to a case when the received address is stored as the terminal address stored in own processor. Thus, the storage areas of respective processors come to a necessary minimum.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to large-scale local area networks (LAN).
This invention relates to a destination information storage method in a bridge system.

[Conventional technology]

Conventionally, in the destination information storage method of a LAN bridge system, the source address (SA) is stored even when a frame is received from the LAN or from the internal system bus.
was stored as is as the address of the terminal accommodated in the own device or the address of the terminal accommodated in the other device.

[Problem to be solved by the invention]

In the conventional destination information storage method described above, the address information of all terminals connected to the system is stored in all data communication processing devices, so it is difficult to use a large-scale LAN.
When it comes to a bridge system, its storage area becomes enormous in size. However, since actual communication is performed only in a certain pattern, there is a problem in that most of the storage area is idle without being used.

[Means to solve the problem]

The destination information storage method of the present invention is used in a large-scale bridge system of a multiprocessor type local area network configured by connecting a plurality of data communication processing devices to a system bus. If a method is adopted in which data is stored from the source address of the frame that actually flows through the system, when a data communication processing device receives a frame from the local area network, the source address is stored as is as the address of the terminal accommodated within the device itself. When a frame is received from the internal system bus, it is not stored as it is as the address of the terminal accommodated in the other device, but it is checked whether the destination address is stored as the address of the terminal accommodated in the own device, and only when it is stored, the source address is stored. is stored as the other device accommodation terminal address.

〔Example〕

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

FIG. 1 is a system configuration diagram, FIG. 2 is a configuration diagram of destination information within a data communication processing device, and FIG. 3 is a sequence diagram of limited storage. Referring to each figure, 200, 210, 2
20.230 is a data communication processing device, 10,20.30
is a terminal accommodated in the LAN, 201 is an address table of terminals accommodated in the own device (destination information table 1), and 202 is a table of terminals accommodated in other devices (destination information table 2).

The destination information tables 1 of 210.2'20 and 230 are called 211, 221.231, respectively, and the destination information tables 2 of 210.2'20 and 230 are called 221, 222, and 232, respectively. As shown in FIG. 1, a mask device (not shown) and data communication processing devices 210, 220, 230 are connected to a loop type system bus, and each data communication processing device is connected to a LAN. Terminals 10, 20, and 30 are connected to each LAN. Each data communication processing device has an internal terminal address table (destination information table 1) 201 and another device terminal table (destination information tape 2) 202 shown in FIG. 2, and controls the destination of frames of the terminal. There is.

FIG. 3 shows a sequence in which the system goes from an unlearned state (no memory) to learning the relationship through communication between the terminals 10 and 20. First, terminal 10 sends a frame to terminal 20. The data communication processing device 210 obtains the address of the terminal accommodated within its own device from the SA in the frame,
Since it is not registered in the table 211, this SA is stored in the table 211, and the destination analysis is performed by searching the table 212 using the DA in the frame. Since the system has not learned yet, the analysis will be abnormal (NG), so the data communication processing device 210 transfers the frame to all other data communication processing devices by broadcasting.

The data communication processing device 230 that has received this circular frame does not unconditionally store the SA in the frame, but first searches the table 231 for the DA. In this case, since there is no match, the SA transfers the frame to the LAN without storing it. Of course,
LANG under the data communication processing device 230:DA=
Since there are no 20 terminals, the frame disappears within the LAN.

Also, the data communication processing device 2 that received the same broadcast frame
Similarly to the processing device 230, the processing device 20 also transfers the frame to the LAN without adding storage information. However, since there is a terminal with DA=20 in the LAN under the processing device 220, the frame arrives at the terminal 0th order, and then the terminal 20
sends the frame back to terminal 10. The processing device 220 obtains the address of the terminal accommodated within its own device from the SA in the frame,
Since it is not registered in the table 221, this SA is stored in the table 221, and the table 222 is searched using the DA in the frame, and the analysis is NG.The processing device 220 broadcasts the frame to all other data communication processing devices. Forward.

The processing device 230 that received this broadcast frame transfers the frame to the LAN without adding any stored information, and disappears within the LAN, as before. On the other hand, when the processing device 210 receiving the same broadcast frame searches the table 211 using DA, it finds a match, and since the SA is not stored in the table 212, it stores the SA (=20) and the device number (220) in the table 212. , transfer the frame to the LAN. Since there is a terminal with DA=10 in the LAN under the terminal 1o, the frame arrives at the terminal. Again, terminal 1
0 returns the frame to the terminal 20, the processing device 210
Since the SA in the frame is already registered in the table 211, the DA searches the table 212 and analyzes it.
The frame is transferred to the processing device 220 according to the analysis result. When the processing device 220 that received this frame searches the table 221 using DA, since the address (=20) has already been stored, the processing device 220 searches the table 221 from the information in the frame.
2, 5A (=10) and device number <210) are stored, the frame is transferred to the LAN, and the frame arrives at the terminal.

Through the above sequence, the communicating processing devices 210,
The destination information is stored only in the processing device 220, and the processing device 230 that is not communicating remains unlearned, and the storage area of each device becomes the minimum necessary.

〔Effect of the invention〕

As explained above, according to the present invention, when a frame is received from the LAN, the SA is stored as it is as the address of the terminal accommodated in the own device, and when a frame is received from the internal system bus, it is stored as it is as the address of the terminal accommodated in the other device. By adopting a method of checking whether the DA is stored as the address of the terminal accommodated in the own device without storing it, and storing the SA as the address of the terminal accommodated in the other device only if it is stored, the SA is connected to the system. Among the address information of the terminals that communicate with the data communication processing device, only the address information of the terminals that communicate with the data communication processing device are stored. It can be done.

[Brief explanation of drawings]

FIG. 1, FIG. 2, and FIG. 3 are diagrams showing one embodiment of the present invention. 200.210, 220.230: Data communication processing device, 10, 20, 30: LAN-accommodated terminal, 201: Address table of terminals accommodated in own device (destination information table 1)
, 202: Other device accommodation terminal table (destination information table 2).

Claims (1)

[Claims] In a large-scale multiprocessor type local area network bridge system configured by connecting multiple data communication processing devices to a system bus, the destination information necessary for frame switching in the local area network is transmitted to the frames that actually flow through the system. When a method of storing from the source address is adopted, when the data communication processing device receives a frame from the local area network, the data communication processing device stores the source address as it is as the address of the terminal accommodated within the device, and receives the frame from the internal system bus. When this happens, the source address is not stored as it is as the address of the terminal accommodating the other device, but it is checked whether the destination address is stored as the address of the terminal accommodating the own device, and only when it is stored, the source address is stored as the address of the terminal accommodating the other device. A destination information storage method characterized by: