JPH03154540A - Address notice system - Google Patents

Abstract

PURPOSE:To attain normal data transmission and reception to the terminal in the same manner as before a terminal equipment is moved even when the terminal equipment is moved, by receiving a multiple address frame from the terminal equipment at application of power and updating and storing its sender's address to a bridge automatically. CONSTITUTION:Each terminal equipment 10 turns on a power switch 15 to apply power supply, then a multiple frame transmission means 14 is started, a multiple address frame is sent and the multiple address frame is received by a bridge 13. The bridge 13 sends the frame to a computer network 11 or 12 in which a terminal equipment of a sender address exists only when the sender address in the received frame is the same as the stored address. In other cases, for example, in the case of the frames using all terminal equipments 10 as the sender address like multiple address frames, the frame is sent to the computer networks 11, 12 and the terminal equipment of the sender address sending the multiple address frame is stored. Thus, normal routing is applied even to a terminal equipment whose location is moved and data transmission/ reception is attained.

Description

[Detailed Description of the Invention] [Summary] Regarding an address notification method for notifying addresses to each terminal on a plurality of local area networks connected by a bridge, the present invention aims to perform normal routing even for relocated terminals. Each computer network consisting of a plurality of terminals is connected by a bridge, and when the bridge receives a frame including at least a source address and a destination address transmitted by the terminal, the bridge stores the network of the terminal of the received source address. , in a network configured to send frames destined only to the stored terminal that are subsequently received, to the network of the stored terminal, when the terminal is powered on, it is transmitted from that terminal to all the terminals that make up the distribution network. Each of the plurality of terminals is configured to include broadcast frame transmitting means for transmitting a broadcast frame having a destination address.

[Industrial application field]

The present invention relates to an address notification method for terminals in a computer network, and more particularly to an address notification method for notifying seven addresses to each terminal on a plurality of local area networks connected by a bridge.

[Conventional technology]

As one type of computer network, a local area network (LAN) is known, which is a communication network built within a limited area without using communication lines provided by common carriers. A large number of terminals are connected to this LAN, and information can be freely exchanged between the terminals according to predetermined conventions.

However, there is a limit to the number of terminals that can be accommodated in one LAN, and if you try to connect more than that, the LAN
It is common to provide a plurality of LANs and connect these LANs with a bridge. This bridge is also effective in distributing risks in the event of a LAN failure.

When connecting two adjacent LANs using this bridge, since the destination terminal is not necessarily connected to the same LAN as the source terminal, the bridge detects the 7 address of the destination terminal, The bridge has a router function that sends data to the destination terminal on the LAN.

This router function generally stores the LAN on which the terminal of the source address that has been received by the bridge is located, and when there is a frame to be sent next, the data will only be sent on that memorized LAN. This is achieved with a learning function that sends According to this learning function, data does not flow on the LAN that is not related to communication (strictly speaking, data flows only once until the location of the terminal is learned), so the amount of traffic decreases. This is very effective.

[Problem to be solved by the invention]

However, with this conventional address notification method, once the bridge memorizes the LAN where the terminal with the received source address is located, the bridge transmits all transmissions to the terminal with the memorized address on the LAN where the terminal is located. Since the data is only sent to the LAN, if the terminal is relocated to another LAN after the above storage, the terminal will not be able to receive data unless the relocated terminal performs a transmission operation.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an address notification method that allows normal routing even to relocated terminals.

[Means to solve the problem]

FIG. 1 shows a basic configuration diagram of the present invention. The present invention provides a computer network 11, 121 consisting of a plurality of terminals 10.
Connect the 1m bridge with the bridge 13, and the bridge 13 connects to the terminal 10.
When a frame containing at least a destination address and a source address is received, the network of the terminal with the received source address is memorized, and subsequent frames that are sent only to the memorized terminal are stored on the network of the memorized terminal. In a network configured to send to
Each terminal 10 is provided with broadcast frame transmitting means 14.

When the terminal 1o is powered on, the above-mentioned broadcast frame transmitting means 14 sends it to the network 11.12 from the terminal 1o.
A broadcast frame having destination addresses addressed to all the terminals 1o making up the terminal 1o is transmitted.

[Effect]

In the present invention, when each terminal 10 turns on the power switch 15 to turn on the power, the broadcast frame transmitting means 14 is activated and transmits a broadcast frame. This broadcast frame is received by the bridge 13. Here, the bridge 13 is configured to transmit the frame only to the computer network where the terminal with the destination address exists only if the destination address in the received frame is the same as the stored one; otherwise, For example, in the case of a frame such as a broadcast frame whose destination address is all the terminals 10, the frame is transmitted to each computer network and the terminal with the source address that transmitted the broadcast frame is stored.

Therefore, even if a terminal is moved from computer network 11 to computer network 12 (or from computer network 12 to computer network 11), when the power switch 15 of the terminal is turned on after the transfer, a broadcast frame is automatically transmitted from the transferred terminal. The source address is automatically updated and stored in the bridge 13.

〔Example〕

FIG. 2 shows a block diagram of an embodiment of the main part of the present invention.

FIG. 2 shows an embodiment of an arbitrary terminal 10, and the same components as in FIG. 1 are given the same reference numerals. In FIG. 2, the power supply panel 21 is the broadcast frame assembly section 2.
2 and a transmission control block 23, and only when the power switch 15 is turned on, the broadcast frame assembling section 22 operates for a predetermined period. The transmission control block 23 is connected to the LAN 25 via an interface section 24.

The transmission control block 23 generates a frame signal having a frame format as shown in FIG. As shown in Figure 3, one frame is a preamble and other synchronization frames F.
The format is a chronological combination of a transmission destination address (a loop address) DA, a transmission source address SA, data DATA, and a packet check area CHK.

The interface section 24 shown in FIG. 2 is a block that controls the physical layer of the LAN 25. Further, 26 is a reception control block that receives the frame signal from the interface section 24. A command analysis unit 27 analyzes each command in the received frame and generates data from the signal from the keyboard 28. Reference numeral 29 denotes an external storage device, which is connected to the command analysis section 29.

Next, the operation of the above configuration will be explained. To start the operation, first turn on the power switch 15 shown in FIG. 2, and the power supply voltage from the power panel 21 is applied to the broadcast frame assembly section 22, which is activated and performs the transmission shown in FIG. 3. A destination address for a broadcast frame with the destination address DA addressed to all terminals is generated and applied to the transmission control block 23. The transmission I11wJ block 23 adds a preamble and other synchronization frames F, data DATA, and a packet check code to the destination address for the broadcast frame in addition to the known source address SA assigned to its own terminal in advance. Generate a circular frame in the format shown in Figure 3 and send it to the interface unit 2.
4 to all the terminals and bridges constructing the LAN 25 for a predetermined period of time.

Next, the operation at the time of transmission after the predetermined period has elapsed after the power is turned on will be explained. At the time of transmission, the transmission data and destination address DA are input from the keyboard 28. As a result, the command analysis unit 27 applies the transmission data DATA in a predetermined format and the transmission destination address DA based on the input from the keyboard 28 to the transmission control block 23, and then the preamble and other synchronization frames F, the transmission source address S.A.

A packet check code and the like are added to generate a frame in the format shown in FIG. This frame is transmitted via the interface section 24 to a terminal at a desired destination address.

Next, the operation during reception will be explained. At this time, from another terminal to LAN25. Frames input via the interface section 24 are received and processed by the reception control block 26, where they are converted into a frame format as shown in FIG. 3, and error correction etc. are performed using a packet check code. The analysis unit 27 determines whether the frame is addressed to itself based on the destination address DA, and if the frame is addressed to itself, the data DATA is processed and stored in the external storage device 29.

Next, the operation when the terminal 10 having the above configuration is relocated will be explained with reference to a LAN interconnection diagram and the like.

FIG. 4 shows an interconnection diagram of the LAN before terminal relocation.

The first LAN 25+ and the second LAN 252 are connected by a bridge 31 (corresponding to the bridge 13 in FIG. 1). Terminals 101 and 102 are connected to the first LAN 25+, which corresponds to the computer network 11, and a terminal 103 is connected to the second LAN 252, which corresponds to the computer network 12. The terminals 101 to 103 have the same configuration, and the second
The terminal 10 has the configuration shown in the figure.

Each of the terminals 101 to 103 exchanges data in units of frames in the format shown in FIG. The bridge 31 stores the source address SA in the frame passing through the bridge 31, and stores which terminal is connected to which LAN. For example, a frame sent from the terminal 101 connected to LAN25+ has a source address SA of address "1" unique to the terminal 101.
Therefore, the bridge 31 that received this frame from the LAN 25+ can recognize that the terminal 25+ whose source address SA is "1" is connected to the AN 25+.

Similarly, the terminal 102 connects the terminal 103 to the LAN25+.
Bridge 31 remembers that it is connected to LAN 25z. FIG. 5 shows the storage contents of the bridge 31 at this time, which are stored in a table format in which the terminal indicated by the source address and the position information of the LAN to which the terminal is connected are associated.

As a result, in subsequent data transmission from the terminal 101 to the terminal 103, the bridge 31 determines that the destination address DA in the received frame is the value "3" indicating the terminal 103, and transmits the frame from the LAN 25+. Do A
Since the frame is transmitted to N252, the terminal 103 can normally receive the frame. Furthermore, the bridge 31 determines the transmission from the terminal 101 to the terminal 102, refers to the storage table shown in FIG. can be received normally, and has the effect of not meaninglessly increasing the amount of traffic on the LAN 252.

Next, the terminal 102 is connected to the first LAN 251 for some reason.
It is assumed that the LAN 252 has been moved from the LAN 252 to the second LAN 252. Therefore, in this case, as shown in FIG.
Only the terminal 101 is connected to the second LAN 252.
Terminals 102 and 103 are connected to ', respectively. In this case, if the storage contents of the bridge 31 remain as shown in the table shown in FIG.
Since the message is looped back only to ', and not sent to the LAN 252', there is a problem that the terminal 102 cannot receive it.

According to this embodiment, when the power of the terminal 102 is turned on after relocation, the broadcast frame is always sent to the terminal 102 for a predetermined period.
Sent from 2. If the destination address in the input frame indicates a specific terminal, the bridge 31 operates so as not to send the frame to the LAN 252' as described above.
When the broadcast frame has a predetermined value indicating 103, an operation is performed to re-memorize the source address SA in the broadcast frame.

Therefore, according to this embodiment, by turning on the power to start the operation of the relocated terminal 102, the bridge 3
1, the memory contents of the relocated terminal 10 are as shown in FIG.
2 is connected to the second LAN 252'. As a result, from then on, even when transmitting data from terminal 101 to terminal 102, frames from terminal 101 are sent to L by bridge 31.
Since it is transmitted to the AN 252', the terminal 102 can normally receive the room.

Note that, according to this embodiment, *m
Every time the switch is turned on, a broadcast frame is transmitted from the terminal whose power switch is turned on for a predetermined period of time.

〔Effect of the invention〕

As described above, according to the present invention, a relay frame is transmitted from a terminal when the power is turned on, and its source address is automatically updated and stored in the bridge. Data can be exchanged normally in the same way as before the relocation, making it easier to manage operations in offices where a relatively large number of terminals are relocated and installed.This also makes it easier to connect between ANs. It has the advantage of greatly contributing to the construction and operation management of distributed systems.

In the figure, 10, 101-1031. is a terminal, 11.12 is a computer network, 13.31 is a bridge, 14 is a broadcast frame transmitting means, and 15 is a power switch.

Claims (1)

[Claims] Each computer network (11, 12) consisting of a plurality of terminals (10) is connected to each other by a bridge (13), and the bridge (13) transmits the source address and transmission information transmitted by the terminal (10). When a frame including at least a destination address is received, the network of the terminal of the received source address is memorized, and subsequently received frames whose destination is only the memorized terminal are sent to the network of the memorized terminal. network, broadcast frame transmitting means (14) for transmitting a broadcast frame having destination addresses addressed to all the terminals constituting the network (11, 12) from the terminal when the terminal is powered on. An address notification method characterized in that it is provided in each of the plurality of terminals (10).