JPH04111555A - Repeating system for bridge - Google Patents

Abstract

PURPOSE:To prevent the unnecessary increase of traffic by stopping to send broadcast frames to the other transmission line by a repeating stop means at the time of selecting the mode where broadcast frames are not sent to the other transmission line. CONSTITUTION:A bridge repeating processing part 11 is provided with a frame discriminating means 11a which discriminates whether the reception frame is a general broadcast frame or not based on a MAC (media access control) address, a mode selecting means 112a which selects the mode where the general broadcast frame is not sent to the other transmission line, and a repeating stop means 113a which stops sending of the reception frame to the other transmission line. When the frame discriminating means 111a discriminates that the reception frame is a general broadcast frame, sending of the reception frame to the other transmission line is stopped. Thus, broadcast frames are not repeated to a network which repeating of broadcast frames to is unnecessary, and the unnecessary increase of traffic is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bridge relay system, and more particularly to a relay system for simultaneous broadcast frames or group broadcast frames.

[Conventional technology]

In conventional relay bridges, all frames received from one transmission path are unconditionally sent to other transmission paths, whether they are broadcast frames, group broadcast frames, or regular frames. Was.

[Problems to be Solved by the Invention] In other words, in bridges using the conventional relay method, broadcast frames (simultaneous broadcast frames or group broadcast frames) are unconditionally relayed, so there is no need to relay broadcast frames. Even in good networks, there are problems in that frames are relayed, causing an unnecessary increase in traffic, and each station is forced to receive unnecessary broadcast frames and perform wasteful processing to discard them.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bridge relay system that solves these problems and allows selection of whether or not to relay broadcast frames.

[Means to solve the problem]

The first invention uses C8MA/C as a transmission path access method.
A plurality of transmitting sections and a receiving section are respectively connected to transmission paths of a plurality of networks adopting the D method, and a received frame received from the transmission path through the receiving section is sent to another transmission path through the transmitting section. In a bridge relay method including a bridge relay processing unit that performs M
frame determining means for determining based on an AC address; mode selecting means for selecting a mode in which the simultaneous broadcast frame is not sent to other transmission paths; this mode selecting means selects the mode; The present invention is characterized in that the bridge relay processing unit is provided with a relay prevention means for preventing the received frame from being transmitted to another transmission path when the received frame is determined to be a simultaneous broadcast frame.

The second invention uses C5MA/C as a transmission line access method.
A plurality of transmitting sections and a receiving section each connected to a plurality of transmission paths of a plurality of networks adopting the D method, and sending received frames received from the transmission path through the receiving section to another transmission path through the transmitting section. A bridge relaying method comprising: a bridge relay processing unit for transmitting a group broadcast frame to another transmission channel; mode selection means for selecting a mode in which the received frame is not transmitted; when the mode selection means selects the mode and the frame determination means determines that the received frame is a group broadcast frame, the received frame other than the received frame is selected; The bridge relay processing section is characterized in that the bridge relay processing section is provided with a relay prevention means for preventing transmission of the signal to the transmission path.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an example of a bridge constructed based on the relay system according to the first aspect of the present invention. This bridge 1 uses CSM as a transmission path access method.
A/CD (Carrier 5ense Mul
Liple Access/Co11ision De
transmission section 12 connected to transmission paths 2a and 2b of two networks adopting the
a2 receiving section 13a, transmitting section 12b, receiving section 13b
and a bridge relay processing section 11 that sends the received frame received from the transmission path through the reception sections 13a and 13b to another transmission path through the transmission sections 12a and 12b. Then, the bridge relay processing unit 11 determines whether or not the received frame is a simultaneous broadcast frame using a MAC (Media
(Access Control) frame determination means 111a for determining based on the address; - mode selection means 112a for selecting a mode in which the simultaneous broadcast frame is not sent to other transmission paths; and this mode selection means 112a.
selects the mode and the frame determining means 111a determines that the received frame is a simultaneous broadcast frame,
Relay blocking means 113a is provided for blocking the transmission of received frames to other transmission paths.

FIG. 2 shows the address system of the CSMA/CD network to which this bridge is connected. This CSMA/C
In the MAC address of the D network, the 1/G bit is used to distinguish between individual addresses and broadcast addresses, and the 1/G bit is
A value of 1 indicates an individual address, and a value of 1 indicates a broadcast address. When all other bits are 1, it indicates a simultaneous broadcast address; otherwise, it indicates a group broadcast address.

Next, the operation will be explained. If the mode selection means 112a does not select a mode in which the simultaneous broadcast frame is not sent to other transmission paths, as shown in FIG.
The signal is input to the bridge 1 through the bridge 1, passes through the bridge 1 unconditionally, and is sent out to the transmission line 2b. For example, station 3b connected to transmission line 2b also has station 3a.
Receive broadcast frames from.

When the mode selection means 112a selects a mode in which the simultaneous broadcast frame is not transmitted to other transmission paths, the simultaneous broadcast frame transmitted from the station 3a is transmitted through the transmission path 2a, as shown in FIG. The received frame is input to the bridge 1, and the frame determination means 111a of the bridge 1 determines that the 1/G bit of the MAC address is 1 and all other bits are 1, so the received frame is a broadcast frame. It is determined that As a result, relay prevention means 113
A prevents the station 3a from transmitting the broadcast frame to the transmission path 2b.

Next, an example of a bridge constructed based on the relay system according to the second aspect of the present invention will be described.

This bridge uses a MAC to determine whether or not a received frame is a group broadcast frame, respectively, by the frame determination means 111a, the mode selection means 112a, and the relay prevention means 113a of the bridge relay processing unit 11 of the bridge 1 in FIG. a frame determining means 111b for determining based on the address; a mode selecting means 112b for selecting a mode in which the broadcast frame is not sent to other transmission paths; the mode selecting means 112b selects the mode;
When the frame determining means 111b determines that the received frame is a group broadcast frame, means for preventing the received frame from being transmitted to other transmission paths.
It has a changed configuration.

Next, the operation will be explained. If the mode selection means 112b does not select a mode in which the group broadcast frame is not transmitted to other transmission paths, as shown in FIG. The signal is input to the bridge 1 through the bridge 1, passes through the bridge 1 unconditionally, and is sent out to the transmission line 2b. For example, station 3b connected to transmission line 2b also receives the group broadcast frame from station 3a.

When the mode selection means 112b selects a mode in which the group broadcast frame is not transmitted to other transmission paths, the group broadcast frame transmitted from the station 3a is transmitted through the transmission path 2a, as shown in FIG. input to the bridge 1, and the frame determination means 111b of the bridge 1
Since the 1/G bit of the AC address is 1 and all other bits are not 1, it is determined that the received frame is a group broadcast frame. As a result, the relay blocking means 113b prevents the group broadcast frame from the station 3a from being sent to the transmission path 2b.

In other words, in the bridge using the relay system of the present invention, if the mode selection means selects a mode in which broadcast frames are not sent to other transmission paths, even if a broadcast frame is received from a certain transmission path, the relay blocking means Sending of the broadcast frame to other transmission paths is blocked. Therefore, it is possible to prevent unnecessary increases in traffic by not relaying broadcast frames to networks that do not need to relay broadcast frames, and to prevent each station from receiving unnecessary broadcast frames. It is also possible to prevent wasteful processing for discarding the data.

Note that in the above embodiment, only two transmission lines are connected to the bridge for ease of understanding, but three transmission lines are connected to the bridge.
When relaying two or more networks or ring type LAN
Of course, the present invention can also be applied when using.

Furthermore, when three or more transmission lines are connected, it is also effective to be able to select a mode in which broadcast frames are not sent for each transmission line. realizable.

Note that if even one station that must receive broadcast frames is connected to a transmission path, it is necessary to send broadcast frames to that transmission path. Therefore, in order to make more effective use of the bridge based on the relay system of the present invention, it is necessary to separate stations that receive broadcast frames, stations that receive group broadcast frames, and stations that do not receive broadcast frames. Better to connect to the network.

〔Effect of the invention〕

As explained above, the first invention provides a plurality of transmitting sections and a receiving section respectively connected to the transmission paths of a plurality of networks that employ the CSMA/CD method as a transmission path access method, and In a bridge relay system, the bridge relay system includes a bridge relay processing section that sends a received frame received through the section to another transmission path through the transmitting section,
MAC determines whether the received frame is a broadcast frame.
a frame determination means for determining based on the address;
A mode selection means for selecting a mode in which the broadcast frame is not transmitted to other transmission paths, and when the mode selection means selects the mode and the frame determination means determines that the received frame is a broadcast frame. The bridge relay processing section is provided with relay prevention means for preventing transmission of the received frame to another transmission path.

Further, the second invention uses CS as a transmission path access method.
A plurality of transmitters and receivers each connected to the transmission line of a plurality of networks employing the MA/CD method, and a received frame received from the transmission line through the receiver unit and sent to another transmission line through the transmitter. A bridge relay method comprising a bridge relay processing unit; a frame determination unit that determines whether a received frame is a group broadcast frame based on the MAC address; a mode selection means for selecting a mode in which the received frame is not transmitted to the other transmission route when the mode selection means selects the mode and the frame determination means determines that the received frame is a group broadcast frame; The bridge relay processing section is provided with a relay prevention means for preventing transmission to the bridge relay processing section.

Therefore, in the bridge using the relay method of the present invention, if the mode selection means selects a mode in which broadcast frames are not sent to other transmission paths, even if a broadcast frame is received from a certain transmission path, the relay blocking means Sending of the broadcast frame to other transmission paths is blocked. Therefore, broadcast frames can be prevented from being relayed to networks that do not need to be relayed, thereby preventing an unnecessary increase in traffic, and each station can be made to receive unnecessary broadcast frames. It is also possible to prevent wasteful processing for discarding the data.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a bridge configured based on the relay method according to the present invention, FIG. 2 is an explanatory diagram showing MAC addresses handled by the bridge shown in FIG. 1, and FIGS. 3 to 5 This figure is a block diagram for explaining the operation of the bridge shown in FIG. 1. 1...Bridge 11...Bridge relay processing section 12a, 12
b...-Transmitting section 13a, 13b...-Receiving section 111a, 1llb--Frame determination means 112a
, 112b...mode selection means 113a, 113b...
・Relay blocking agent Yoshiyuki Iwasa, patent attorney Example of MAC address system

Claims (2)

[Claims] (1) A plurality of transmitting units and a receiving unit each connected to a transmission line of a plurality of networks that adopts the CSMA/CD method as a transmission line access method, and receiving frames received from the transmission line through the receiving unit. In a bridge relay method including a bridge relay processing unit that sends out to another transmission path through the transmission unit, M determines whether the received frame is a simultaneous broadcast frame.
frame determining means for determining based on an AC address; mode selecting means for selecting a mode in which the simultaneous broadcast frame is not sent to other transmission paths; the mode selecting means selects the mode, and the frame determining means The relay of the bridge is characterized in that the bridge relay processing section is provided with a relay prevention means for blocking the transmission of the received frame to another transmission path when the received frame is determined to be a simultaneous broadcast frame. method. (2) A plurality of transmitting units and a receiving unit each connected to a plurality of transmission lines of a plurality of networks adopting the CSMA/CD method as a transmission line access method, and receiving frames received from the transmission line through the receiving unit. A bridge relay system comprising a bridge relay processing unit that sends out to another transmission path through the transmitting unit, frame determining means for determining whether or not the received frame is a group broadcast frame based on a MAC address. , mode selection means for selecting a mode in which the group broadcast frame is not transmitted to other transmission paths; the mode selection means selects the mode; and the frame determination means determines that the received frame is a group broadcast frame. A bridge relay system, characterized in that the bridge relay processing section is provided with a relay prevention means for preventing transmission of the received frame to another transmission path when it is determined that the received frame is transmitted to another transmission path.