JPH05327718A - Remote bridge device - Google Patents

Abstract

(57) [Summary] [Purpose] Via the same remote bridge device,
An object of the present invention is to provide a remote bridge device which mounts a plurality of systems having different bridge systems capable of communicating with each other on the same LAN and enables a wide area system which is far away. [Configuration] A source routing logic execution means, a transparent bridge logic execution means, and a MAC / protocol / data unit determination means are provided in a remote bridge device, and MPDU in a reception frame is provided.
The flag of is checked and the execution means is selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote bridge which interconnects remote local area networks (hereinafter referred to as LAN) with a wide area network or the like.

[0002]

2. Description of the Related Art FIG. 3A shows a conventionally known IEEE.
It is a block diagram of the SRT bridge proposed by 802.1x. FIG. 3B is a block diagram of a known source routing bridge. 4 is a configuration diagram of a LAN network system using the bridge shown in FIG. In FIG. 4, 1 indicates a MAC bridge and 2 indicates a terminal. In FIG. 3 (a), 20 is a bridge
It is a higher layer entity such as a protocol entity and bridge management. Reference numeral 21 is a MAC relay entity, which has both SR logic executing means 22 and TB logic executing means 23. Reference numeral 24 is an RII (Routing Information Indicator) determining means, 30 is an LLC entity, and 40 is a MAC entity. In FIG. 3B, 25
Is a MAC relay, 41 is a PHY, 42 is a MAC for receiving a frame, and 43 is a MAC for transmitting a frame.

Next, the operation of this conventional example will be described. When an SRT bridge is used as the bridge in FIG. 4,
There is a mixture of a terminal 2 that constitutes a network system, a source routing bridge (SR) system as a host computer (not shown), and another terminal or host computer that is not shown, such as a transparent bridge (TB) system. It was possible. That is, the communication frame from the SR system terminal to another SR system terminal is SR
Although it is transmitted via the T-bridge 1, at that time, as shown in FIG.
As shown in (a), the information RII in the frame is examined 24, and the bridge employs SR logic 22 to make a source routing selection based on the routing information stored in the transmitted message. On the other hand, a communication frame from a terminal of the TB system to another terminal of the TB system is similarly SRT.
It is transmitted via the bridge 1. At that time, the RII in the frame is checked 24, and the bridge is TB logic 23.
To send a frame after filtering.

There is a remote bridge shown in FIG. 5 as another conventional example. This is IEEE802.1g / d3
In the network system shown in FIG. 6, the configuration shown by 10 is adopted. The remote bridge 10 is also connected to the LAN to which the terminal 2 and the like are connected, and is connected to the remote bridge 10 at the other end by a dedicated line. The remote bridge 10 at the other end is connected to another LAN. In FIG. 5, 51 is a frame receiving unit, 52 is a filtering database, 53 is a relay process unit, and 54 is a frame transmitting unit. 55 is LAN port status information,
Reference numeral 56 is virtual port state information. This operation is shown in Figure 5.
As shown in (a), the frame received from the LAN passes through the frame receiving section 51, and the relay process section 53 receives the filtering database 52 and the LAN port status information 5.
5 and the virtual port status information 56, filtering is performed, and only frames for other LANs are sent to the wide area network via the frame transmission unit 54. Figure 5 at the other end
As shown in (b), the frame receiving unit 51 performs a process opposite to that of the remote bridge at the transmitting end, and the frame is transmitted to the LAN via the frame transmitting unit 51. In this way, a wide area network can be configured even with a LAN that is far away.

[0005]

The conventional SRT bridge is constructed as described above, and one bridge should be prepared even for a plurality of systems composed of terminal groups of different connection methods. However, there is a problem that it is not possible to connect a plurality of systems configured by LANs that are far apart by one bridge. Further, in the system using the remote bridge, a system incorporating a remote LAN can be configured, but there is another problem that it is a transparent bridge and a plurality of systems having different connection methods cannot be mounted.

The present invention has been made in order to solve the above problems, and provides a remote bridge device which mounts a plurality of systems having different connection systems on the same LAN and enables a wide area system which is far away. The purpose is to get.

[0007]

A remote bridge device according to the present invention has a source routing (hereinafter referred to as SR) logic execution means, a transparent bridge (hereinafter referred to as TB) logic execution means, a MAC Protocol data unit (hereinafter MPD
(Referred to as “U”) discrimination means is provided, and with respect to a frame received from the LAN, the flag of MPDU in the frame is checked and SR
If yes, S that filters by looking at routing information
If R logic is executed and transmitted, and the flag is TB compatible, T
Execute B logic and if it is for own LAN, discard it and other LAN
If it is destined for, it will be transmitted and output to the LAN at the other end.

[0008]

The remote bridge device according to the present invention is
In response to the MPDU flag of the received frame from one end, another processing is performed and transmitted, and the result is output to the LAN at the other end.

[0009]

【Example】

Example 1. FIG. 1 shows a remote controller according to an embodiment of the present invention.
It is a figure which shows operation | movement and a structure of a bridge apparatus. In the figure, S1 to S6 are processing steps, but S2, S3,
S4 is also a component. FIG. 2 is a block diagram showing an example of a wide area network system using the remote bridge device shown in FIG. In the figure, 4 is a LAN,
Reference numeral 11 is a remote bridge device.

Next, the operation of this embodiment will be described.
In FIG. 1, the remote bridge device 11 receives the communication frame from the LAN (step S1), and the BPDU
The RII is discriminated by the discriminating means (step S2). RII
If is 1, the process is performed by the SR logic executing means for comparing with the route information of the own bridge based on the routing information in the frame (step S3). If it matches the route information of the own bridge, frame forwarding is performed (step S5), and if it does not match the route information of the own bridge, the frame is discarded (step S6). If the received frame has an RII of 0, the process is performed by the TB logic executing means, such as connecting to the own LAN and looking at the filtering table of a device such as a registered terminal (step S4). If the destination of the frame is in the own LAN, the frame is discarded (step S6). If the destination of the frame is not in the own LAN, the frame is forwarded because it is destined for another LAN (step S5). The transmission to the other end is output to another LAN as it is (step S
7) so that this remote bridge device constitutes a set of bridges at both ends. In this sense, it can also be called a half remote bridge.

By using the remote bridge device having both the SR logic executing means and the TB logic executing means in this way, a wide area network system can be constructed with a large distance between the bridges shown in FIG. Communication between SR type devices and communication between TB type devices can coexist in the system.

[0012]

As described above, according to the present invention, since the remote bridge device having the SR logic executing means and the TB logic executing means is used, the SR connection is made even in the wide area network system constituted by the LANs which are remote from each other. There is an effect that it is possible to construct an efficient system in which the system and the TB connection system are mixed.

[Brief description of drawings]

FIG. 1 is a diagram showing an operation and a configuration of a remote bridge device according to an embodiment of the present invention.

FIG. 2 is a configuration block diagram showing an example of a wide area network system using a remote bridge device of the present invention.

FIG. 3 is a configuration diagram of a conventional SRT bridge and a source routing bridge.

FIG. 4 is a LAN system configuration diagram using a conventional bridge connection.

FIG. 5 is a block diagram of a conventional transparent remote bridge.

FIG. 6 is a configuration diagram of a conventional LAN system for remote bridge connection.

[Explanation of symbols]

 11 Remote Bridge Device S2 MPDU Discrimination Means S3 SR Logic Execution Means S4 TB Logic Execution Means

Claims (1)

[Claims] 1. A remote bridge that connects local area networks (hereinafter referred to as LANs) that are far apart by a wide area network or the like, comprising source routing (hereinafter referred to as SR) logic execution means, and transparent bridges (hereinafter referred to as TB). Logic execution means and MAC / protocol / data unit (hereinafter referred to as MPDU) discrimination means. For a frame received from the LAN, look at the flag of the MPDU in the frame, and if it is SR compatible, routing information A remote bridge device that executes and transmits SR logic for filtering and, if the flag is TB compatible, executes and transmits TB logic and outputs to the port on the other end.