JPS63311830A - Bridge device for local area network - Google Patents

Abstract

PURPOSE:To attain the small size by sending a reply when a destination address sent from an opposite bridge is in an SA memory in a reception destination bridge so as to eliminate the need for the storage of the information managing the data transmission between bridges. CONSTITUTION:An SA memory 4 storing the sender address of a data received from a local area network LAN 1 to be connected, a reception control section 3 fetching the data when the destination address of the data received from the LAN 1 to be connected is addressed to the SA memory 4, a transmission control section 5 sending the data received from the opposite bridge to the LAN 1 to be connected, an interbridge communication control section 6 controlling the inter-bridge data transmission and a communication control section 7 transmitting/receiving the address destination data and the broadcast data specified between the bridges are provided. Then the destination address sent from the opposite bridge is received from its own communication section 7, and when the address is in the SA memory 4, the reply is given to the communication control section 7 as the opposite bridge destination data. Thus, the storage area of the bridge is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bridge device for a local area network (hereinafter abbreviated as LAN).

[Conventional technology]

Conventionally, this type of Blitzno equipment is connected to an interconnected LAN.
to transfer data between bridges.

In addition to the terminal address information of the LAN connected to the source bridge or the destination bridge, the bridge had information for managing data transfer between bridges.

[Problem that the invention seeks to solve]

In the conventional Brisono device described above, the source bridge or the destination bridge has information for managing data transfer between bridges, so the storage area of the bridge becomes large. In addition, if the source bridge has management information, it is necessary to update the information by passing the management information between the bridges every time the overall network configuration changes. If the destination bridge has it, there is a problem that data is always broadcast to the bridge connection transmission path.

The present invention provides a Brisono device for a local area network that solves these problems of the conventional device.

[Means for solving problems]

The present invention provides an SA memory for storing a source address of data received from an interconnected local area network, and a memory for storing the data if the destination address of the data received from the interconnected local area network is not in said SA memory. A reception control unit that imports the data, a transmission control unit that transmits the data imported from the other bridge to the interconnected local area network, and a data destination address that transmits the data imported to the reception control unit to the other bridge. is passed as broadcast data to the communication control unit of the other bridge.

If there is a response thereto, the data is passed to the communication control unit as data addressed to the bridge that received the response.

If there is no response, the data is passed to the communication control unit as broadcast data, and the destination address sent from the other party is received from the own communication control unit, and if the address is in the SA memory, the response is transmitted as data addressed to the other bridge. The communication control unit is configured to include an inter-bridge communication control unit that has a function of passing data to a communication control unit as a bridge, a function of receiving data from the other bridge from the communication control unit, and a communication control unit that transmits and receives data addressed to a specific address and broadcast data. Ru.

〔Example〕

Next, one embodiment of the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of the Brissonneau apparatus of the present invention.

In the figure, reference numeral 4 denotes an SA memory (SAM) that stores the source address of data received from connected LAN 1.

3 is a reception control unit (RC) that takes in the data if the destination address of the data received from connected LAN 1 is not in SAM 4, and 5 is a transmission control unit (RC) that sends the data received from the other party to connected LAN i) C6 is an inter-bridge communication control unit (
BCC), 7 is a communication control unit (CC) that transmits and receives data addressed to a specific address and broadcast data between the terminals.

FIG. 2 shows the operations when data is transferred from the terminal at address a on LANI to the terminal at address b on LAN 2 in the order of numbers marked with circles. ■Include the bridge. ■,
RC13 has imported the data.

Issue a transmission request to BCC16. ■, BCCl 6 CCs the destination address as broadcast data.
Give it to 17. ■, CCl 7 transmits data.

(2) In the bridge (B2) 20, the CC 27 receives the broadcast data and passes it to the BCC 26.

■, BCC26 received destination address b is SAM2
4, the response is passed to the CC 27 as data addressed to the bridge 1 (Bl) 10. (2) CC27 transmits data. ■, CC in bridge l (Bl)I O, k
7 receives the data and passes it to the BCC 16.

(2) Since the BCC 16 received the response, it passes the data to the CC 17 as data addressed to the bridge 2 (82) 20. [Phase], CCl 7 transmits data. ■, Bridge 2 (
B2) 20 smell CC27 receives f-evening 1) BC
Pass it to C26. ■, BCC26 sends the received data to 5
Pass it to C25. (2) The SC25 transmits data.

Figure 3 shows the terminal from address a on LAN 1 to address d.
This shows the operation when transferring data to a terminal. (2) Since the destination address d of the data is not in the SAM 14 at 10 (Britsuno 1 (81)), the data is taken into the RC 13. ■, RC13 has imported the data, so BC
Issue a transmission request to Cl 6. ■.

The BCC 16 passes the data destination address to the CC 17 as broadcast data. (2) CC17 transmits data. ■, Bridge 2 (B2) 20° Bridge 3 (
B3) At 30, the CC 27° 37 receives the broadcast data and passes it to the fi BCC 26, 36. ■；
Bcc 26, 36 is the received destination address d is S
Since there is no response in AM 24, 34, no response is returned. BC'C16 does not receive a response in bridge 1 (Bl) 10, so it passes the data to CC17 as broadcast data. ■.

CC17 transmits data. ■, Brisso l (B2
) 20.2 Ritz 3: (B 3 ) CC at 30
27°37 receives broadcast data 58CC
Pass it to 26, 36. ■, BCC26, 36 passes the received data to esc25.35. [Phase], SC25
s35 transmits data.

[Effects of the Invention] As is clear from the above description, the present invention has the following effects:
In order to transfer data that requires inter-bridge transfer to the other bridge, the source bridge first broadcasts the data for the destination address, and then, if there is a response, it sends the data to the bridge that received the response. If there is no response, the data is sent as a broadcast. Furthermore, if the destination address transmitted from the opposite bridge is stored in the SA memory at the receiving destination bridge, a response can be sent, thereby eliminating the need to store information for managing data transfer between bridges.

It is compact and can handle changes in network configuration without being aware of changes in network configuration. Furthermore, if a communication control unit (Kirishiro) that can send and receive data addressed to a specific address and broadcast data is present in the network, it is possible to interconnect local area networks relatively easily, and other benefits can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of a bridge device according to the present invention, and FIG. 2 shows a case in which the bridge device of FIG. 1 is used to transfer data addressed to an address existing in the SA memory in the network. Figure 3 shows an example of the operation of
FIG. 2 is a diagram illustrating an example of an operation when data addressed to an address that does not exist in the network (in SA memory) is transferred using the bridge device in FIG. 1; In the figure, l is a connected LAN, 2 is an inter-bridge connection LAN, 3 is a reception control unit (RC), 4 is an SA memory (SAM), 5 is a transmission control unit (SC), 6 is an inter-bridge communication control unit, 7 is a communication control unit (CC).

Claims (1)

[Claims] 1. An SA memory that stores the source address of data received from an interconnected local area network and a destination address of data received from an interconnected local area network that stores the data if it is not in the SA memory. The reception control unit that imports data and the local area that interconnects the data imported from the other bridge.
A transmission control unit that sends data to the network, and in order to transfer data captured by the reception control unit to the other bridge,
The destination address of the data is passed as broadcast data to the communication control unit of the other bridge, and if there is a response, the data is passed to the communication control unit as data addressed to the bridge that received the response, and if there is no response, the data is passed as broadcast data. a function to pass to the communication control unit;
A function that receives the destination address sent from the other bridge from its own communication control unit, and if the address is in the SA memory, passes the response to the communication control unit as data addressed to the other bridge, and a function that transmits the data from the other bridge to the communication control unit. 1. A bridge device for a local area network, comprising: an inter-bridge communication control unit having a function of receiving data from a specific address, and a communication control unit that transmits and receives data addressed to a specific address and broadcast data.