JPH05344120A - Bridge device between local area networks - Google Patents

Abstract

PURPOSE:To stop the infinite loop of data in a local area network without affecting other operations. CONSTITUTION:A reception circuit A (REA11) compares the destination address of received data from a LANA 10 with information stored in an address information storage circuit A (ADA) 15, in the case of data to be transmitted to a LANB 20, data are dispatched to a clear judge circuit A (CLA) 12 and in the case of abnormal data information detected by the other bridge device, the erasing instruction of data concerning abnormality is outputted to the ADA 15. Next, the CLA 12 dispatches data to a time circuit judge circuit A (TOA) 13 and when data are passed through a bridge device BRG 1 more than specified times, the transmission of abnormal address clear information is demanded to an abnormal address information clear transmission circuit (ACR) 40. The ACR 40 instructs transmission circuits A (SEA) 24 and SEB 14 so as to transmit the abnormal information to the LANA 10 and LANB 20. When the data are not passed through the bridge device 1 more than the specified times, the data are transmitted from the SEB 14 to the LANB 20. Concerning data received from the LANB 20 through the REB 21, the similar operation is performed as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge device between local area networks.

[0002]

2. Description of the Related Art In a conventional bridge device between local area networks, when the address of the data transmission destination is incorrect, the data passes through a plurality of bridge devices many times.

[0003]

In this conventional bridge device between local area networks, if the address information of the data is incorrect, an infinite loop phenomenon of the data by the plurality of bridge devices occurs, so the address information is updated. Until then, there was a problem that the data did not reach the other party correctly.

[0004]

A bridge device between local area networks according to the present invention provides necessary received data based on address information stored in an address information storage circuit owned by itself between two local area networks. A time-out determination circuit that determines whether the received data has passed through the self-bridge device more than a predetermined number of times specified in advance, and to which terminal the received data has timed out when the received data times out. Abnormal address information clear transmission circuit for notifying other bridge device of time-out data indicating whether or not, and clears its own address information based on the abnormal address information transmitted or receives address clear information transmitted from another bridge device Then, it is determined whether the address information is abnormal and the own address information is clicked. And a want to restore clear decision circuit.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, an inter-local network bridge device (hereinafter, BRG) 1 of this embodiment is connected between a local network A (hereinafter, LANA) 10 and a local network B (hereinafter, LANB) 20, and LA
The receiving circuit A (hereinafter RE
A) 11, an address information storage circuit A (hereinafter referred to as ADA) 15 that stores address information of data, and a clear determination circuit that determines whether the received data is data to be transmitted to the LANB 20 or clear data. A (hereinafter CL
A) 12, a time-out determination circuit A (TOA) 13 for determining whether the received data has passed the BRG 1 more than a preset number of times, and a transmission circuit B (hereinafter SEB) 14 for transmitting data to the LANB. And an abnormal address information clear transmission circuit (hereinafter referred to as ACR) 40 that creates data to be cleared to the abnormal address because the address of the received data is abnormal because the received data has passed through the BRG 1 a specified number of times or more. , Again, LANB20
Similarly to the case of the LANA 10 described above, the receiving circuit B (hereinafter REB) 21, the clear determination circuit B (CLB) 22 and the address information storage circuit B (ADB) 2
5, a timeout determination circuit B (TOB) 23, and a transmission circuit A (hereinafter SEA) 24.

Next, the operation of this embodiment will be described.

First, the flow of data from the LANA 10 to the LANB 20 will be described.

The REA 11 receives the data from the LANA 10, receives the destination address of the received data and the ADA 15
Is compared with the address information stored in the memory, and it is determined whether the data is data to be transmitted to the LANB 20. In the case of the data to be transmitted, the data is passed to the CLA 12. CLA
In 12, when the received data is abnormal data information detected by another bridge device, the ADA 15 is instructed to erase the data related to the abnormality.

Next, the CLA 12 transfers the data to the TOA 13. Based on the numerical value in the data, the TOAB determines whether or not the BRG1 has passed the prescribed number of times established in advance, and if it exceeds the prescribed number of times, requests the ACR 40 to send the abnormal address clear information.

The ACR 40 instructs the SEA 24 and SEB 14 to send the information address clear information to the LANA 10 and LANB 20, respectively. If the BRG1 has not been passed the specified number of times or more, the SEB 14 directly connects to the LAN.
Send data to B20.

Next, the flow of data from the LANB 20 to the LANA 10 will be described.

The REB 21 receives the data from the LANB 20, and receives the destination address of the received data and the ADB 25.
The address information of 1 is compared to determine whether the data is data to be transmitted to the LAND 10. For data to be sent,
Pass data to CLB22. In the CLB 22, when the received data is the abnormal data information detected by the other bridge device, the CLB 22 issues an instruction to erase the data related to the abnormality to the ADB 25.

Next, the CLB 22 transfers the data to the TOB 23. The TOB 23 determines whether or not the BRG1 has passed the preset number of times set in advance by the numerical value in the data, and when the preset number of times is exceeded, the ACR
Request 40 to send the abnormal address clear information. AC
R40 instructs SEB14 and SEA24 to send abnormal address clear information to LANB20 and LANA10, respectively. If the BRG1 has not been passed the specified number of times or more, the data is transmitted from the SEA 24 to the LANA 10 as it is.

[0016]

As described above, according to the present invention, an abnormal address information clear judging circuit is provided to manage the own bridge device when data that has passed through the own bridge device is generated a predetermined number of times or more. By sending clear data that clears the address data of the address information storage circuit to the local area network, when the address information of its own bridge device is incorrect, an infinite loop of data occurs between multiple bridge devices, This has the effect of automatically solving the problem that the data does not reach the other party correctly, and can also erase only the abnormal address without affecting the operation of the bridge device.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

[Explanation of symbols]

1 Local area network bridge device (B
RG) 10 local area network A (LANA) 11 reception circuit A (REA) 12 clear determination circuit A (CLA) 13 timeout determination circuit A (TOA) 14 transmission circuit B (SEB) 15 address information storage circuit A (ADA) 20 Local area network B (LANB) 21 Reception circuit B (REB) 22 Clear determination circuit B (CLB) 23 Timeout determination circuit B (TOB) 24 Transmission circuit (SEA) 25 Address information storage circuit B (ADB) 40 Abnormal address information clear Sending circuit (ACR)

Claims (1)

[Claims] 1. The necessary received data is made to pass through based on the address information stored in the address information storage circuit that the local area network has between the two local area networks, and the received data is equal to or more than a predetermined specified number of times. A time-out determination circuit for determining whether the data has passed through its own bridge device, and an abnormal address for notifying other bridge device of time-out data indicating which terminal has received time-out data when the received data times out. An information clear sending circuit, which clears the address information of its own on the basis of the sent abnormal address information or receives address clear information sent from another bridge device to determine whether it is abnormal address information and obtain its own address information. A local erunnette characterized by having a clear judgment circuit for clearing Work bridge device.