JPH0514371A - Bridge repeating system - Google Patents

Abstract

PURPOSE:To eliminate the overhead of the rise of traffic or abandonment of unnecessary simultaneous broadcast frames in a station by not repeating unnecessary general broadcast frames or group broadcast frames to prevent the unnecessary rise of traffic. CONSTITUTION:Various broadcast frames sent from a station 3a are sent to a transmission line 2a; but if a transmission line 2b of a token bus bridge 1 is set to the mode which inhibits passage of various broadcast frames, they are not sent to the transmission line 2b because they do not pass. The traffic of the transmission line 2b is reduced with respect to transmission line, and the overhead of adandonment of unnecessary various broadcast frames is reduced with respect to station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay system of a token bus bridge and a token ring bridge, and more particularly, a relay of a bridge for realizing a broadcast frame relay system including a broadcast frame and a group broadcast frame. It is related to the method.

[0002]

2. Description of the Related Art Conventionally, token bus bridges and token ring bridges of this type have a means for relaying broadcast frames unconditionally.

[0003]

In the above-mentioned conventional token bus bridge and token ring bridge, the broadcast frame is unconditionally relayed. Therefore, the broadcast frame need not be relayed even in the network which does not need to be relayed. However, there was a problem that the traffic must be increased, and unnecessary broadcast frames must be received and discarded at the station.

[0004]

According to the bridge relay system of the present invention, a plurality of transmission devices are connected to a shared transmission line,
In a token bus bridge that relays between two or more bus-type networks that form a logical ring using the token bus method as a transmission path access method, the destination addresses of MAC (Media Access Control) addresses are broadcast simultaneously. First selecting means for selecting a mode of whether or not to relay a frame of an address by a bridge,
Second selecting means for selecting a mode of whether or not the frame having the destination address of the MAC address of the specific group broadcast address is relayed by the bridge, and unconditionally the frames other than the broadcast frame and the group broadcast frame Bridge relaying means, bridge relaying in the mode of relaying the simultaneous broadcast frame and group broadcast frame, bridge non-relaying in the mode of not relaying, and a mode obtained by this means in the token bus. It is provided with means that enables setting for each node of the bridge.

A bridge relay system according to another invention of the present invention comprises a ring network in which a plurality of transmission devices are connected to a shared transmission line and a token ring system is used as a transmission line access system. In a token ring bridge relaying between two or more networks, a first selecting means for selecting a mode of whether or not a frame whose destination address of a MAC address is a broadcast address is relayed by the token ring bridge;
Second selecting means for selecting a mode for relaying a frame having a specific group broadcast address as a destination address of the AC address by a token ring bridge, and unconditionally selecting a frame other than a broadcast frame and a group broadcast frame And a means for relaying the token ring bridge, a means for performing the token ring bridge relay in the mode for relaying the broadcast broadcast frame or the group broadcast frame, and a means for not performing the token ring bridge in the non-relay mode. It is provided with a means that makes it possible to set the obtained mode for each node of the token ring bridge.

[0006]

In the present invention, unnecessary broadcast frames and group broadcast frames are not relayed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram for explaining one embodiment of the present invention, and shows a case where it is composed of two or more networks and a token bus bridge which relays between them. In FIG. 1, reference numeral 1 is a relay between two or more networks of a bus type network in which a plurality of transmission devices are connected to a shared transmission line and a logical ring is formed by using a token bus system as a transmission line access system. Token bus bridges, 2a and 2b are transmission lines, and 3a and 3b are stations. Although a token bus bridge that relays two networks will be described for simplification of description, the same applies to the case of connecting three or more networks.

FIG. 1A is a diagram for explaining the functions when the conventional token bus bridge and the token bus bridge according to the present invention are used in a mode of passing a broadcast frame. In this case, the broadcast frame sent from the station 3a unconditionally passes through the token bus bridge 1 and is sent to the transmission line 2b of another network. The station connected to the transmission line 2a also receives the broadcast frame.

FIG. 1 (b) is a diagram for explaining a function when the token bus bridge according to the present invention is used in a mode in which simultaneous broadcast is not passed. In this case station 3
The broadcast frame transmitted from a is transmitted to the transmission line 2a, but the transmission line 2b side of the token bus bridge 1 is in a mode in which the broadcast frame is not allowed to pass. Therefore, the broadcast frame is not passed. Not sent to 2b. Therefore, the station connected to the transmission path 2b does not receive the broadcast frame. Here, even if the broadcast frame is relayed, the broadcast frame is unnecessary if the network of the transmission path 2a does not use the broadcast frame, and is received by all stations without fail. , Stations that do not need broadcast must discard the frame each time they are received.
Therefore, by not passing an unnecessary broadcast frame through the token bus bridge, it is possible to reduce the traffic of the transmission line 2b in the transmission line and reduce the overhead of discarding the unnecessary broadcast frame in the station. .

FIG. 1C is a diagram for explaining the function when the token bus bridge according to the present invention is used in a mode in which group broadcast is not passed. In this case, the group broadcast frame sent from the station 3a is the transmission line 2
The transmission line 2 of the token bus bridge 1 is sent to a.
Since the side b is in a mode in which group broadcasts are not allowed to pass and group broadcast frames are not allowed to pass, transmission line 2b
Not sent to. Therefore, the station connected to the transmission line 2b also does not receive the group broadcast frame.
Here, even if the group broadcast frame is relayed, the group broadcast frame is an unnecessary frame unless the network of the transmission path 2a uses the group broadcast frame. As in the case of the simultaneous broadcast, the group broadcast frames often fly frequently, and by not passing unnecessary unnecessary broadcast frames through the token bus bridge, the traffic of the transmission path 2b can be reduced in the transmission path. it can.

FIG. 2 is a block diagram showing an embodiment of the present invention and shows an example of the structure of a token bus bridge.
In FIG. 2, the same reference numerals as those in FIG. 1 indicate corresponding parts, 11 is a token bus bridge relay processing unit, 12a,
Reference numeral 12b is a token bus transmission unit, and 13a and 13b are token bus reception units. Then, the token bus bridge relay processing unit 11 selects a mode for selecting whether or not the frame having the broadcast address as the destination address of the MAC address is relayed by the bridge, and the group address for which the destination address of the MAC address is a specific group broadcast. Selection means for selecting whether to relay a frame of an address by a bridge, relay means for unconditionally bridging a frame other than a broadcast frame and a group broadcast frame, and a broadcast frame or a group broadcast frame. It has means for performing bridge relay in the mode of relaying frames and not for bridge relay in the mode of not relaying, and means for making it possible to set the mode obtained by this means for each node of the token bus bridge. ing.

Next, the operation of the embodiment shown in FIG. 2 will be described. First, the frame received from the transmission line 2 a is received by the token bus receiving unit 13 a and passed to the token bus bridge relay processing unit 11. In the token bus bridge relay processing unit 11, all the received frames other than the broadcast frame are unconditionally transmitted to the token bus transmitting unit 12b,
It is sent to the transmission line 2b. Then, in the case of the simultaneous broadcast frame, it is relayed in accordance with the simultaneous broadcast relay mode, and in the case of the relay mode, it is relayed like other frames like a normal token bus bridge. In the non-relay mode, the broadcast is not relayed and is discarded. Also, in the case of a group broadcast frame, it is relayed according to the group broadcast relay mode, and in the case of the group broadcast relay mode, it is relayed like other frames like a normal token bus bridge. Next, in the non-relay mode, the group broadcast frame is not relayed and is discarded. Even when three or more transmission lines are connected, it is possible to set the broadcast mode and group broadcast relay mode for each port, and the broadcast mode and group broadcast mode can be set according to each mode. You can choose whether to broadcast the broadcast. If there is at least one station that has to receive the broadcast frame, the broadcast mode or group broadcast mode must be set. In order to effectively use the token bus bridge in the present invention, it is necessary to divide the network into an application that uses broadcast, an application that uses group broadcast, and an application that does not use broadcast.

FIG. 3 is an explanatory diagram showing an example of the address system of the token bus network. In the token bus network, the MAC address often distinguishes the individual address from the broadcast address including the broadcast by the I / G bit. In this case, when the I / G bit is "0", it is an individual address, when the I / G bit is "1", it is a group broadcast, and when all the addresses are "1", it is a broadcast address. It is defined. Therefore, in the token bus bridge relay processing unit 11, the I / O of the MAC address
First, it is possible to judge whether the G bit is "1" or not to discriminate whether it is a broadcast frame. Further, the case where the MAC address is all "1" is the broadcast frame.

As described above, according to the token bus bridge relay system of the present invention, unnecessary traffic is prevented by providing means for not relaying unnecessary broadcast frames and group broadcast frames. The overhead of ascending and discarding useless broadcast frames at stations can be eliminated.

FIG. 4 is an explanatory diagram for explaining another embodiment of the present invention, and shows a case where it is composed of two or more networks and a token ring bridge which relays between them. In FIG. 4, reference numeral 21 is a token which is connected to a plurality of transmission devices on a common transmission line and which relays between two or more networks which are ring networks which use the token ring system as a transmission line access system. Ring bridges, 22a and 22b are transmission lines, 23
a and 23b are stations. Although a token ring bridge that relays two networks will be described for simplification of description, the same applies to the case of connecting three or more networks.

FIG. 4 (a) is a diagram for explaining the function when the conventional token ring bridge and the token ring bridge according to the present invention are used in a mode of passing a broadcast frame. In this case, the broadcast frame transmitted from the station 23a unconditionally passes through the token ring bridge 21 and is transmitted to the transmission path 22b of another network. The station connected to the transmission path 22a also receives the broadcast frame.

FIG. 4 (b) is a diagram for explaining the function when the token ring bridge according to the present invention is used in a mode in which simultaneous broadcast is not passed. In this case, the broadcast frame sent from the station 23a is the transmission line 22a.
However, since the transmission line 22b side of the token ring bridge 21 is in a mode in which the simultaneous broadcast does not pass and the simultaneous broadcast frame does not pass, it is not transmitted to the transmission line 22b. Therefore, the station connected to the transmission path 22b does not receive the broadcast frame. Here, even if the group broadcast frame is relayed,
If the network of the transmission path 22a does not use the broadcast, the broadcast frame is an unnecessary frame, and all stations receive it without fail. Must be discarded. Therefore, by not passing the unnecessary broadcast frame through the token ring bridge 21, it is possible to reduce the traffic of the transmission line 22b in the transmission line and reduce the overhead of discarding the unnecessary broadcast frame in the station. it can.

FIG. 4 (c) is a diagram for explaining a function when the token ring bridge according to the present invention is used in a mode in which group broadcast is not passed. In this case, the group broadcast frame sent from the station 23a is sent to the transmission line 22a, but the token ring bridge 21
Since the transmission line 22b side is in a mode in which the group broadcast is not passed and the group broadcast frame is not passed, it is not sent to the transmission line 22b. Therefore, the station connected to the transmission path 22b also does not receive the group broadcast frame. Here, even if the group broadcast frame is relayed, the group broadcast frame is unnecessary if the network of the transmission path 22a does not use the group broadcast frame. And, like the simultaneous broadcast, the group broadcast frame will often fly frequently,
Token ring bridge 21
In the transmission line, the transmission line 22b
Traffic can be reduced.

FIG. 5 is a block diagram showing another embodiment of the present invention, which shows a configuration example of a token ring bridge. In FIG. 5, the same reference numerals as those in FIG. 4 indicate corresponding parts, and 31 indicates a token ring bridge relay processing unit, 3
2a and 32b are token ring transmitters, and 33a and 33b
Is a token ring receiver. Then, the token ring bridge relay processing unit 31 selects a mode for selecting whether or not to relay a frame whose broadcast address is the broadcast address of the MAC address by the token ring bridge, and the destination address of the MAC address is a specific group. Selection means for selecting a mode for relaying the frame of the broadcast address by the token ring bridge, relay means for unconditionally relaying frames other than the broadcast frame and the group broadcast frame by the token ring bridge, and the broadcast mode In the mode of relaying the broadcast frame or the group broadcast frame, the token ring bridge relay is performed, and in the mode of not relaying, the token ring bridge relay is not used.
It has means for enabling the mode obtained by this means to be set for each node of the token ring bridge.

Next, the operation of the embodiment shown in FIG. 5 will be described. First, the frame received from the transmission path 22a is received by the token ring receiving unit 33a and passed to the token ring bridge relay processing unit 31. In the token ring bridge relay processing unit 31, the token ring transmitting unit 32b unconditionally receives the received frames other than the broadcast frame.
To the transmission line 22b. Then, in the case of the broadcast frame, it is relayed according to the broadcast relay mode, and in the relay mode, it is relayed like other frames like a normal token ring bridge. In the non-relay mode, the broadcast is not relayed and is discarded. In the case of a group broadcast frame, the frame is relayed in the same manner as other frames like a normal token ring bridge in the mode of group broadcast relay according to the mode of group broadcast relay.

Next, in the non-relay mode, the group broadcast frame is not relayed and is discarded. Even when three or more transmission lines are connected, it is possible to set a broadcast mode and group broadcast relay mode for each boat, and broadcast mode and group broadcast mode can be set according to each mode. You can choose whether to relay group broadcasts. If there is at least one station that has to receive the broadcast frame, the broadcast mode or group broadcast mode must be set. In order to effectively use the token ring bridge in the present invention, it is necessary to divide the network into an application that uses broadcast, an application that uses group broadcast, and an application that does not use broadcast.

FIG. 6 is an explanatory diagram showing an example of the address system of the token ring network. In the token ring network, the MAC address often distinguishes an individual address from a broadcast address including a broadcast by an I / G bit. In this case, the individual address is when the I / G bit is "0", the group broadcast is when the I / G bit is "1", and the broadcast address is when all the addresses are "1". Is defined as Therefore, the token ring bridge relay processing unit 31 can first determine whether the I / G bit of the MAC address is "1" to distinguish whether it is a broadcast frame. Further, the case where the MAC address is all "1" is the broadcast frame.

As described above, according to the token ring bridge relay system of the present invention, by providing means for not relaying unnecessary broadcast frames and group broadcast frames, unnecessary traffic is prevented and traffic of the traffic is prevented. The overhead of ascending and discarding useless broadcast frames at stations can be eliminated.

[0024]

As described above, the present invention has means for not relaying unnecessary broadcast frames and group broadcast frames, thereby preventing unnecessary traffic, increasing traffic, and wasting unnecessary traffic at stations. This has the effect of eliminating the overhead of discarding broadcast frames.

[Brief description of drawings]

FIG. 1 is an explanatory diagram for explaining an embodiment of the present invention.

FIG. 2 is a block diagram showing an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an example of an address system of a token bus network.

FIG. 4 is an explanatory diagram for explaining another embodiment of the present invention.

FIG. 5 is a block diagram showing another embodiment of the present invention.

FIG. 6 is an explanatory diagram showing an example of an address system of a token ring network.

[Explanation of symbols]

1 Token bus bridge 2a, 2b transmission line 3a, 3b stations 11 Token bus bridge relay processing unit 12a, 12b Token bus transmitter 13a, 13b Token bus receiver 21 Token Ring Bridge 22a, 22b Transmission line 23a, 23b stations 31 Token Ring Bridge Relay Processing Unit 32a, 32b Token ring transmitter 33a, 33b Token ring receiver

Claims (2)

[Claims] 1. A token relaying between two or more networks of a bus type network in which a plurality of transmission devices are connected to a shared transmission line and a logical ring is formed by using a token bus system as a transmission line access system. In the bus bridge, first selecting means for selecting a mode of whether or not a frame having a broadcast address as a destination address of a MAC address is relayed by the bridge, and a frame having a destination address of the MAC address as a specific group broadcast address Second selection means for selecting a mode of whether or not to relay with a bridge, relay means for unconditionally bridging frames other than the broadcast frame and the group broadcast frame, and the broadcast frame and the group broadcast frame. Bridge relay in the mode of relaying the report frame, and bridged in the mode of not relaying A bridge relay system characterized by comprising means for not continuing and means for enabling the mode obtained by this means to be set for each node of the token bus bridge. 2. A token ring bridge for relaying between two or more networks, each of which is composed of a ring network in which a plurality of transmission devices are connected to a shared transmission line and which uses a token ring system as a transmission line access method. A first selecting means for selecting a mode for relaying a frame having a broadcast address as a destination address of the MAC address by a token ring bridge, and a frame having a destination address of the MAC address as a specific group broadcast address. Second selection means for selecting a mode of whether or not to relay the packet with the token ring bridge, relay means for unconditionally relaying frames other than the simultaneous broadcast frame and the group broadcast frame by the token ring bridge, and the simultaneous broadcast Talk when in the mode for relaying frames or group broadcast frames It is characterized by comprising means for not performing the token ring bridge relay in the mode of relaying the ringing bridge and not relaying, and means for making it possible to set the mode obtained by this means for each node of the token ring bridge. Bridge relay system.