JPH06232874A - Data transmitting system for bridge - Google Patents

Abstract

PURPOSE:To continue data transmission through a bridge by defining whether a communication path between terminals is redundantly constituted or not and processing a fault only to a port managing part when the fault is generated at the port managing part and the communication path between terminals is not redundantly constituted. CONSTITUTION:At a bridge 101 provided with the function of a spanning tree protocol, a port managing part 102 is provided with a fault recognizing part 113 for judging the normality of that part itself and judging the normality of respective ports 104-107, fault processing part 112 for performing the fault processing of the port managing part and the ports, and configuration definition information 114 showing the presence/absence of redundant configuration. When any fault is generated at the port managing part, this information is referred to, when the bridge and the ports are not redundantly constituted, fault processing is performed only to the port managing part, and data transmission is continued.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system in a bridge having a spanning tree protocol function.

[0002]

2. Description of the Related Art The definition of spanning tree protocol is described in the international standard IEEE802.1D. That is, the bridge is defined to calculate the spanning tree using the protocol calculation information given by the configuration definition and the spanning tree control frame transmitted / received by each port via the data transmission path. That is, in this regulation, only the method of constructing a logical tree-structured communication route from the topology of the data transmission lines bridge-connected to each other is prescribed.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
E802.1D cannot determine whether the bridge has a redundant configuration. Therefore, when the bridge has a redundant configuration and a port management unit that controls the protocol of the spanning tree fails, a closed loop may be formed in the communication path in the bridge-connected network. And the closed loop configuration of the communication path is
This is a forbidden topology of a bridge-connected network, and if a closed loop is formed, an error may occur in the order of frames received by a terminal, or there may be a problem that two or more same frames are received.

Therefore, in the above-mentioned conventional bridge, when a failure occurs in the port management section, it is necessary to perform failure processing for the port management section and all ports. However, there is a problem that the data transmission cannot be continued.

An object of the present invention is to define whether a communication path (bridge or port) between terminals has a redundant configuration,
To provide a data transmission method that, when a failure occurs in the port management unit, only the port management unit handles the failure if the communication path between the terminals is not a redundant configuration and continues the data transmission via the bridge. It is in.

[0006]

In order to achieve the above object, according to the present invention, a plurality of ports connected to a bus for accommodating a data transmission path and a port management unit connected to the bus for controlling a spanning tree protocol. And a means for judging the normality of the port management section and the normality of each of the ports, a means for processing a failure of the port management section and the port, A means for storing information indicating whether or not the communication path has a redundant configuration is provided, and when a failure occurs in the port management unit, the failure processing means refers to the information and the communication path between terminals is When the redundant configuration is not adopted, failure processing is performed on the port management unit to continue data transmission, and when the communication path between the terminals is redundant, the port management unit and all ports are Performs failure processing for bets, is characterized by stopping the data transmission.

[0007]

In the bridge having the function of the spanning tree protocol, the port management unit determines the normality of the port management unit and the failure recognition unit that determines the normality of each port, and the port management unit and the port. A failure processing unit for performing failure processing and configuration definition information indicating the presence / absence of a redundant configuration are provided. When a failure occurs in the port management unit, the failure processing unit refers to the configuration definition information, and if the communication path (bridge or port) between the terminals does not have a redundant configuration, only the port management unit performs the failure processing. In this way, by providing the port management unit with the configuration definition information indicating whether or not the communication path between the terminals has a redundant configuration, when the port management unit fails, if the port management unit does not have the redundant configuration, only the port management unit performs failure processing. As a result, data transmission via the bridge can be continued.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram of the bridge of the present invention. In the figure, a bridge 101 is a port management unit 10.
2, a bus 103, ports 104 to 107, and data transmission paths 108 to 111. Further, the port management unit 102 includes a failure processing unit 112 and a failure recognition unit 1
13, the configuration definition information 114, and the spanning tree control unit 115, and the ports 104 to 107.
Are connected to the data transmission paths 108 to 111, and data is transferred between the connected data transmission paths.

The fault recognition section 113 is a port management section 102.
Or the presence or absence of a fault in the ports 104 to 107, and notifies the fault processing unit 112 of the fault site and the presence or absence of a fault. The failure processing unit 112 performs failure processing according to the notification from the failure recognition unit 113.

When the spanning tree control unit 115 receives the spanning tree control frame from the ports 104 to 107, the spanning tree control unit 115 calculates the spanning tree and instructs the transmission of the spanning tree control frame to be transmitted to the data transmission lines 108 to 111. The respective ports 104-107
Instruct.

Also, the ports 104 to 107 are instructed of the port state which is the calculation result of the spanning tree, that is, the frame relay operation state defined by IEEE802.1D. The ports 104 to 107 receive the frame from the data transmission paths 108 to 111, and if the frame is a spanning tree control frame, the spanning tree control unit 115 of the port management unit 102.
If the frame is a relay frame for the bridge and the own port is in the relay operation enabled state, the received frame is bus-transferred to the destination port.

If the own port is in the relay operation prohibited state, the received frame is discarded. The port that has received the frame by the bus transfer sends the received frame to the data transmission path if the own port is in the relay enabled state.
If the own port is in the relay operation prohibited state, the received frame is discarded.

The configuration definition information 114 stores information indicating the presence or absence of a redundant configuration of communication paths between terminals, that is, bridges or ports, and spanning tree control information. FIG. 2 is a diagram showing details of the configuration definition information 114 included in the port management unit 102 of the bridge 101. This configuration definition information 201 is information 202 indicating whether or not there is a redundant configuration of a communication path (bridge or port) between terminals. And spanning tree control information 203.

As described above, the fault recognizing unit 113 causes the fault in the port managing unit 102 or the ports 104 to 10 to occur.
The presence or absence of the fault of No. 7 is determined, and the fault processing unit 112 is notified. FIG. 5 is a processing flowchart of the fault recognition unit.
That is, it is determined whether or not the port management unit 102 has a failure (step 401), and when it is determined that the port management unit 102 has a failure and the port has a failure (step 402), the port management unit and the port Failure processing unit 1
12 is notified (step 403).

If there is no fault in the port management unit 102 (step 401) and it is determined that there is a fault in the port (step 404), the fault processing unit 1 detects the fault in the port.
12 (step 405), and the port management unit 102
If there is a fault in the port (step 401) and it is determined that the port has no fault (step 402), the fault processing unit 112 is notified of the fault in the port management unit (step 40).
6).

The failure processing section 112 carries out failure processing according to the notification from the failure recognition section 113. FIG. 6 is a processing flowchart of the failure processing unit. That is, when the port management unit 102 has a failure (step 501), the failure processing unit 112 searches the configuration definition information 114 to check the information 202 indicating the presence or absence of the redundant configuration of the port or bridge (step 502).

When there is no redundancy and there is a failure in the port (step 503), the port management unit and the failed port are initialized (failure processing) (step 50).
4). When there is no fault in the port in step 503, only the port management unit is initialized (fault processing) (step 508).

If the port management unit 102 has a failure (step 501) and the configuration definition information 114 is referred to and there is a redundant configuration (step 502), the port management unit 10
2 and all the ports 104 to 107 are processed for failure (step 507). If the port management unit 102 has no fault (step 501) and the port has a fault (step 505), the fault port is initialized (fault processing) (step 506).

FIG. 3 is a diagram showing an example of the configuration in which there is no redundant configuration in the bridge and port in the LAN connection of the port. In FIG. 3, 301 is a bridge, 302 is a port management unit, 303 is a bus, 304 to 307 are ports,
308 to 311 are LANs, 312 is a failure processing unit, 313.
Is a fault recognition unit, 314 is configuration definition information, and 315 is a spanning tree control unit.

In the above configuration, each port 304
307 to 307 respectively accommodate LANs 303 to 304, and the bridge 301 and each port do not have a redundant configuration. Therefore, when defining the configuration definition information 314, the information indicating the presence or absence of the redundant configuration in the configuration definition information 314 includes Defined as no redundant configuration.

To explain the operation, when a failure occurs in the port management unit 302 and the failure of the port management unit 302 is notified to the failure recognition unit 313, the failure recognition unit 313 follows the processing flow chart described above. Of the port management unit 302 is recognized and the failure processing unit 312 is notified of the failure of the port management unit 302.

The failure processing section 312 identifies that only the port management section 302 has a failure by the notification from the failure recognition section 313. Then, by referring to the information indicating the presence / absence of a redundant configuration in the configuration definition information 314, it is recognized that there is no redundant configuration, and only the port management unit 302 initializes the hardware and controlware, that is, performs a failure process. As a result, the ports 304 to 307 maintain the state of the frame relay operation. Therefore, even if a failure occurs in the port management unit 302, the bridge 301 can be used as a data transmission path in a bridge-connected network and communication can be continued.

FIG. 4 is a diagram showing an example of a structure in which a bridge and a port have a redundant structure in the LAN connection of the ports. In FIG. 4, 301 and 301 'are bridges,
302 is a port management unit, 303 is a bus, and 304 to 307.
Is a port, 308 to 310 is a LAN, 312 is a failure processing unit, 313 is a failure recognition unit, 314 is configuration definition information, 31
Reference numeral 5 is a spanning tree control unit.

In the above configuration, ports 304 and 305 are connected to the LAN 308 to form a redundant configuration.
Since the bridges 301 and 301 'are connected to N309 and 310 to form a redundant configuration, when defining the configuration definition information 314, the information indicating the presence or absence of the redundant configuration of the configuration definition information 314 defines that there is a redundant configuration. .

In FIG. 4, a failure occurs in the port management unit 302, and the failure in the port management unit 302 is the failure recognition unit 31.
3 is notified, the failure recognition unit 313 recognizes the failure of the port management unit 302 according to the processing flowchart described above, and notifies the failure processing unit 312 of the failure of the port management unit 302.
Notify of failure. The fault processing unit 312 is the fault recognition unit 3
The notification from 13 identifies that only the port management unit 302 has a failure. Then, the configuration definition information 314
By referring to the information indicating the presence / absence of the redundant configuration, the fault management of the port management unit 302 and all the ports is performed by recognizing that the redundant configuration exists.

[0026]

As described above, according to the present invention, since the configuration management information indicating whether or not the bridge and the port have the redundant configuration is stored in the port management unit, the port management unit has a failure. If the bridge and the port do not have a redundant configuration when the above occurs, only the port management unit performs the failure processing, and the data transmission via the bridge can be continued.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a bridge of the present invention.

FIG. 2 is a diagram showing details of configuration definition information.

FIG. 3 is a diagram showing a configuration example when a bridge and a port do not have a redundant configuration.

FIG. 4 is a diagram showing a configuration example when a bridge and a port have a redundant configuration.

FIG. 5 is a processing flowchart of a fault recognition unit.

FIG. 6 is a processing flowchart of a failure processing unit.

[Explanation of symbols]

 101 Bridge 102 Port Management Unit 103 Bus 104, 105, 106, 107 Ports 108, 109, 110, 111 Data Transmission Line 112 Fault Processing Unit 113 Fault Recognition Unit 114 Configuration Definition Information 115 Spanning Tree Control Unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Fukuda 810 Shimoimaizumi, Ebina City, Kanagawa Prefecture Office Systems Division, Hitachi Ltd. (72) Terumi Harada, 1 Horiyamashita, Hadano City, Kanagawa Prefecture Hitachi Computer Data Engineering Co., Ltd. (72) Inventor Masayuki Okada 5-22-1, Kamimizuhoncho, Kodaira-shi, Tokyo Inside Hitachi Microcomputer System Co., Ltd. Hitachi, Ltd. Office Systems Division

Claims (1)

[Claims] 1. A bridge comprising a plurality of ports connected to a bus for accommodating a data transmission path, and a port management unit connected to the bus for controlling a spanning tree protocol, wherein the port management unit has a port management function. Stores information indicating whether the communication path between the terminals has a redundant configuration, a means for determining the normality of a unit and the normality of each port, a means for handling a failure of the port management unit and the port Means is provided, and when a failure occurs in the port management unit, the failure processing unit refers to the information, and when the communication path between the terminals does not have a redundant configuration, the port management unit fails. Perform data processing to continue data transmission, and if the communication path between terminals has a redundant configuration, perform fault processing on the port management unit and all ports to stop data transmission. Data transmission method in the bridge characterized by.