JPH03250936A - Repeater - Google Patents

Abstract

PURPOSE:To realize this repeater having a sufficiently high performance data transfer capability by executing the discriminating as to whether or not a reception frame is addressed to its own equipment by the retrieval processing of a route information base(RIB). CONSTITUTION:An equipment address 'X' of a repeater 20 itself and a dummy port number '0' corresponding to its own equipment address are registered in an RIB 23 in addition to an address and a port number corresponding to terminal equipments 11-16. Thus, the discrimination as to whether or not a reception frame is addressed to its own equipment is executed by the retrieval processing of the RIB 23 the same as the selection processing to select a transmission destination port to send the reception data. Thus, it is not required to execute the discrimination processing other than the retrieval processing of the RIB 23, the time required for the transfer processing of the reception frame is shortened and the repeater with high data transfer capability is realized.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a relay device that controls data transfer between networks.

(Prior art) Generally, a relay device is equipped with an RIB (Route Information Base) that is registered for each terminal device, such as the address of the terminal device and the port number to which the terminal device is connected, and uses the RIB. controls data transfer between networks. In data transfer control using this RIB, the following four different processes are performed on received data frames.

The first process is executed when the relay device receives a reception frame addressed to the relay device and transmitted from the terminal device. In this case, the relay device does not perform transfer processing for the received frame, but performs internal processing according to the contents of the received frame. This internal processing is executed to respond to various arrangements, such as notifying other relay devices of the traffic volume of the device itself.

The second process is executed when the destination address included in the received frame is not registered in the RIB and the destination port is unknown. In this case, the relay device transfers the received frame to each of all ports except the receiving port.

The third process is executed when the destination address included in the received frame is registered in the RIB. In this case, the relay device refers to the RIB, recognizes the port corresponding to the destination address, and transfers the received frame to the recognized port.

The fourth process is executed when the destination address included in the received frame is registered in the RIB and the port number corresponding to the destination address is the same as the port number of the received frame. In this case, the relay device discards the received frame because the data is transferred within one network rather than across networks.

Of these four processes, the second to fourth processes can be executed by searching the information registered in the RIB, but in order to execute the first process, the RI
In addition to the search process for B, special processing is required to determine whether the received frame is addressed to the device itself.

For this reason, in conventional relay devices, a process is first performed to determine whether or not a received frame is addressed to the device itself, and if the received frame is not addressed to the device itself, the above-mentioned RIB search process is performed. It was done. Normally, in a relay device, the probability that a received frame is addressed to the relay device itself is very low, and most of the received frames are addressed to other terminal devices. However, as mentioned above, in conventional relay devices, it is necessary to perform processing to determine whether or not a received frame addressed to another terminal device is addressed to the device itself. This has the disadvantage that the time required to transfer the received frame increases by the amount of time required. This is a major cause of reducing the data transfer ability of the relay device.

ψ? Problem 8) In conventional relay devices, in addition to RIB search processing, it is necessary to perform processing to determine whether or not a received frame is addressed to the device itself. Processing to determine whether or not a frame is addressed to the device itself must be performed, which has the drawback of increasing the time required to forward the received frame. .

The present invention has been made in view of these points, and it enables a relay with sufficiently high-performance data transfer ability to determine whether or not a received frame is addressed to the device itself through RIB search processing. The purpose is to provide equipment.

[Configuration of the Invention (Means for Solving the Problems) A relay device according to the present invention is for controlling data transfer between networks, and includes a terminal address corresponding to each terminal device of the network and its terminal address. table means in which are registered a boat number corresponding to the relay device, a self-device address corresponding to the relay device, and a dummy port number corresponding to the second self-device address; Recognizing the port number corresponding to the included destination address, and determining whether or not the received data should be processed within the relay device according to the recognized port number, and the destination to which the received data should be sent. and means for executing selection processing for selecting a port, and the received data is processed within the relay device when the recognized port number is the dummy port number.

(Operation) In this relay device, in addition to the address and port number corresponding to the terminal device, the own device address of the relay device itself and the dummy port number corresponding to the own device address are registered in the table means. Therefore, in the same way as the selection process of selecting the destination port to which the received data should be transmitted, it is possible to determine whether the received frame is addressed to the device itself by searching the table means. Therefore, processing other than search processing of the table means is unnecessary, so the time required for transfer processing of received frames can be shortened, and a relay device with high data transfer capability can be realized.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a relay device according to an embodiment of the present invention. This relay device 20 controls data transfer between the first to third local area networks L1 to L3, and controls the data transfer between the first to third local area networks L1 to L3.
1, a transmission and reception processing section P2 that exchanges data with the second local area network L2, and a transmission and reception processing section P3 that exchanges data with the third local area network L3. ing. These transmission/reception processing units P1 to P3 are connected to the relay device 20.
The ports function as the first to third ports of the respective ports.

The first local area network L1 is provided with a terminal device 11 to which an address "A" is assigned and a terminal device 12 to which an address "B" is assigned. In addition, a second local area network L2
is the terminal device 1 to which address “C” is assigned.
The third local area network L3 is provided with a terminal device 14 to which an address "E" is assigned and a terminal device 14 to which an address "F" is assigned. A terminal device 16 is provided.

The relay device 20 further includes a relay processing section 21, a learning processing section 22, and an RIB 23. Relay processing unit 21
is based on the At1nos information registered in the RIB23 and the port number information corresponding to the address information,
Executes various relay processes for received frames. As mentioned above, this relay processing includes internal processing of received frames, forwarding of received frames to a specific port, forwarding of received frames to all ports other than the receiving port, discarding of received frames, etc. included. The learning processing unit 22
The process of registering address information and port number information for the B23 and the process of updating these information are executed.

The RIB 23 has the terminal device 1
Terminal addresses corresponding to numbers 1 to 16 and port numbers corresponding to the terminal addresses are registered.

In the example of FIG. 1, the terminal device 11 with the address "A" and the terminal device 12 with the address "B" are connected to the relay device 2.
Since it is connected to the first port of 0, the address “A”
and “1” is registered as the port number corresponding to “B”. Furthermore, since the terminal device 13 with the address “C” and the terminal device 14 with the address “Do” are connected to the second port of the relay device 20, the port numbers corresponding to the addresses “C” and “D” are “2°”. is registered, and similarly, "3" is registered as the port number corresponding to addresses "E" and "F".

The RIB 23 further registers a self-device address “X” assigned to the relay device 20 and a dummy port number “0” corresponding to this self-device address “X”. This dummy port number "O" does not indicate the transfer destination port of the received frame, but indicates that the received frame is internally processed by the relay device 20 itself.

Next, referring to the flowchart in FIG. 2, the relay device 2
The processing procedure for received frames by 0 will be explained.

First, a frame is received by the relay device 20 (step A1), and the source address and reception port number of the received frame are registered in the RIB 23 by the learning processing unit 22 (step A2). For example, when the relay device 20 receives a frame transmitted from the terminal device 11 with address "A", "A" is registered as the source address and "1" is registered as the receiving port number. Such address and reception port number registration processing is not executed if the address is already registered in the RIB 23.

Next, through the RIB 23 search process performed by the relay processing unit 21, the destination address included in the received frame is found in the RIB 23.
28 is registered (step A3).
). If the destination address is not registered in the RIB 23, it is unknown which port the destination terminal device is connected to, so the received frame is forwarded to all ports other than the receiving port ( Step A4).

On the other hand, if the destination address is registered in the RIB 23, it is determined whether the port number corresponding to the destination address, that is, the destination port, is the same as the receiving port (step A5). If they are the same, the data transfer is within the same network, so the relay device 20
discards the received frame (step AS).

Furthermore, if the destination port is different from the reception port, it is determined whether the destination port matches the dummy port number "0" (step A7), and if they match, the reception frame is processed within the relay device 20 (step A8).

On the other hand, if the destination port is not the dummy port number "0°," the received frame is transferred to the destination port (step A9).

In this way, in this embodiment, the terminal devices 11 to 1
In addition to the address and port number corresponding to No. 6, a self-device address “X” of the relay device 20 itself and a dummy port number “0” corresponding to the self-device address are registered in the RIB 21. Therefore, similar to the selection process of selecting the destination port to which the received data should be transmitted, it is possible to determine whether the received frame is addressed to the device itself by the search process of the RIB 23. Therefore, since there is no need to perform any determination process other than the RIB 23 search process, the time required for the received frame transfer process can be shortened, and a relay device with high data transfer capability can be realized.

[Effects of the Invention] As described above, according to the present invention, it is possible to determine whether or not a received frame is addressed to the device itself by searching the RIB, thereby achieving sufficiently high-performance data transfer. A relay device with this capability can be realized.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a relay device according to an embodiment of the present invention, and FIG. 2 is a flowchart explaining the operation of the relay device shown in FIG. 1. 20... Relay device, 21... Relay processing unit, 22...
- Learning processing section, 23...RIBSPi~P3... Transmission/reception processing section.

Claims (1)

[Claims] In a relay device that controls data transfer between networks, a terminal address corresponding to each terminal device in the network, a port number corresponding to that terminal address, a self-device address corresponding to the relay device, and a correspondence to this self-device address A table means in which a dummy port number is registered, and a port number corresponding to a destination address included in the received data are recognized by referring to the table means, and the received data is processed according to the recognized port number. means for executing processing for determining whether processing is to be performed within the relay device and selection processing for selecting a destination port to which the received data should be transmitted, when the recognized port number is the dummy port number; A relay device characterized in that received data is processed within the relay device.