JPH0442638A - Closed area connection method in token ring - Google Patents

Abstract

PURPOSE:To allow a network manager to eliminate the need for the management of the propriety of connection in the unit of terminal equipment and to realize easily the connection of a closed area by allowing each bridge to judge the propriety of connection depending on a ring number of a token ring to which a terminal equipment is connected. CONSTITUTION:Suppose that a bridge device 11 receives a frame from a terminal equipment 25 to a terminal equipment 21 through a main network 1, then upon the receipt of the frame, a data transmission reception section 113 gives the frame to a relay processing section 112 and takes over the control thereto, and the relay processing section 112 references a reaching information part of the received frame to discriminate the propriety of relay. The relay processing section 112 recognizes the frame to a be a frame coming from a terminal equipment connecting to a sub network 4 to check whether or not the sub network 4 exists in a connection enable ring number list. When in existence, source routing bridge is implemented to judge the propriety of relay. Thus, the closed area connection function is easily realized in a large scale network.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a closed connection method in a token ring interconnected by source routing.

[Conventional technology]

FIG. 6 is a block diagram of a token ring disclosed in, for example, Japanese Unexamined Patent Publication No. 147837/1983.

Token Ring has been standardized as IEEE802.5 LAN by the IEEE802 (IEEE802) committee, which is a LAN standardization organization. In FIG. 6, 50 to 53 are terminal devices, and 54 is a data transmitting/receiving mechanism that receives data on the LAN existing in the terminal device, performs MAC level address check, data copying, and transmission. 55 is a closed connection mechanism that exists in the terminal device and is used when changing the address at the MAC level from the data transmission/reception mechanism 54.

Next, the operation will be explained. DA of the received frame (
When the destination address (destination address) matches the address of the local station, the data transmitting/receiving mechanism 54 passes control to the closed area connection mechanism 55. The closed area connection mechanism 55 follows the connection permission MAC station address list of FIG. 7 that is preset therein.
Check whether the SA (source address) is a station that is permitted to connect. The result of the check is notified to the data transmitting/receiving mechanism 54. If the check result shows that the connection is possible, the data transmitting/receiving mechanism 54 continues the receiving process. If the result of the check is that the unit is connected, no reception processing is performed.

[Problem to be solved by the invention]

In conventional closed-area connection methods, as the network grows, the list of connection-permitted MAC station addresses increases, and each station must manage connection-permitted MAC station addresses on a terminal-by-terminal basis. There was a problem that the load on the administrator increased.

The present invention has been made in view of these points, and its purpose is to provide a closed connection function to each bridge in a plurality of token rings interconnected by a plurality of bridges, and to The goal is to control closed connections on a token ring basis.

[Means to solve the problem]

In order to achieve such an object, the present invention provides a plurality of token rings that are interconnected by a plurality of bridges, and when terminals connected to each ring communicate by source routing, the bridge assigns a token to each token ring. It is possible to establish a closed connection by determining whether or not communication is possible between the terminals connected to the token ring based on the ring number assigned to the token ring.

[Effect]

The closed connection method in token ring according to the present invention is as follows:
Since it is determined whether or not to connect on a token ring basis, the burden on the network administrator is reduced, and since there is no need to provide a closed connection mechanism for each terminal, a closed connection function can be easily implemented in a large-scale network.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a token ring network for explaining an embodiment of a closed connection method in a token ring according to the present invention. In the figure, 1 indicates a backbone network, 2 to 5 indicate subnetworks, all of which are token rings, and 11 to 15 indicate bridges that interconnect the token rings using a source routing method, and represent bridge numbers. Further, 21 to 25 indicate terminals connected to subnetworks 2 to 5.

FIG. 2 shows a token ring frame format, with a destination address section 312, a source address section 32. Routing information section 33. It has an information section 34. The first bit of the source address section 32 is a routing information identifier 35 indicating the presence or absence of the routing information section 33.

In addition, in Figure 2, SD is the start delimiter, FC
is a frame control field, FC3 is a frame check sequence, and ED is an end limiter.

A frame communicated via a bridge always has a routing information section 33, and based on this information, it is determined whether or not it can be relayed.

FIG. 3 is a block diagram of the routing information unit 33, which is composed of a routing control unit 36 and a plurality of route designation units 37.

The routing control section 36 includes a length information section 41 . It has a direction flag 42 indicating the reading direction of the route designation section 37.

The route designation section 37 includes a ring number section 43 and a bridge number section 44.

In FIG. 3, B is a broadcast identifier, F is maximum frame length information, and r is a reservation.

FIG. 4(a) is a configuration diagram of a bridge device 11 that interconnects token rings using a source routing method.
It consists of data transmitting/receiving sections 111 and 113, a relay processing section 112, and a connection permission ring number list section 114.

The connection permission ring number list section 114 is divided into two parts depending on direction. 115 in FIG. 4(b) is subnetwork 2
116 is a connection permission ring number list from core network 1 to subnetwork 2.
This is a list of ring numbers allowed to connect to.

Next, the operation will be explained. For example, the bridge 11 transfers a frame from the terminal 25 to the terminal 21 to the backbone network 1.
Suppose you receive it from .

When the data transmitting/receiving unit 113 receives the frame, it passes the frame to the relay processing unit 112 and transfers control thereto.

The relay processing unit 112 refers to the routing information section 33 of the received frame and determines whether relaying is possible.

An example of the routing information section 33 at this time is shown in FIG. The routing control section 36 shows that there are three route designation sections 37, and a relay route is described in the right direction.

Then, relay processing section 112 recognizes that the received frame is a frame from a terminal connected to subnetwork 4, and checks whether subnetwork 4 exists in connection permission ring number list 116.

If subnetwork 4 is connection permission ring number list 1
16, it is recognized that the connection is not permitted and the received frame is discarded.

Furthermore, if subnetwork 4 exists in the connection permission ring number list 116, the following normal source routing bridge operation is performed to determine whether or not relaying is possible.

Referring to the route designation section 37 of the received frame, the ring number 1. If there is a combination of bridge number 11 and ring number 2, bridge 11 relays the frame from network 1 to network 2.

In the above embodiment, each bridge has a connection permission ring number list section 114, but it may also have a connection refusal ring number list. In this case, the ring number to which the frame originating terminal belongs is Relay is rejected when registered on the list.

〔Effect of the invention〕

As explained above, the present invention eliminates the need to determine whether connection is possible for each terminal by allowing each bridge to determine whether connection is possible based on the ring number of the token ring to which the terminal is connected. Since the network administrator does not need to manage whether or not a connection can be made on a terminal-by-terminal basis, it is possible to easily establish a closed connection.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of a token ring network for explaining the closed connection method in token ring according to the present invention, Figure 2 is a format diagram showing a frame format on token ring, and Figure 3 is the configuration of the routing information section. 4 is a configuration diagram of a bridge that interconnects token rings, FIG. 5 is a configuration diagram showing an example of a routing information section, and FIG. 6 is a configuration diagram of a token ring network for explaining a conventional method. Figure 7 shows the conventional connection permission M
FIG. 3 is a list diagram showing an AC station address list. Figure 1

Claims (1)

[Claims] In a plurality of token rings interconnected by a plurality of bridges, when terminals connected to each ring communicate by source routing, the bridge is connected to the token ring by a ring number assigned to each token ring. 1. A closed connection method in a token ring, which is characterized by determining whether or not communication is possible between terminals connected to each other to enable a closed connection.