JPH10150455A - Data transmission control method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the data transmission control method and device in which data are transmitted without taking part in a logic ring to realize the token passing system. SOLUTION: In the data transmission system employing the token passing system that controls data transmission of each station by circulating a token among a plurality of stations (1-N) forming a logic ring, an idle time is provided to a token circulation time when a token is circulated and data transmission of a station (network management tool) other than the stations forming a logic ring is permitted for the idle time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls data transmission of each station by circulating a token representing a transmission right among a plurality of stations forming a logical ring on a communication network such as a local area network (LAN). The present invention relates to a data transmission control method and apparatus based on a token passing method, and more particularly, to a data transmission control method which realizes a LAN analyzer function and a LAN management function by enabling data transmission from another station which does not form the logical ring. And equipment.

[0002]

2. Description of the Related Art Conventionally, as a tool for monitoring a failure in a network (communication network) such as a local area network, 1) a LAN analyzer function (frame monitor) for monitoring an information frame transmitted on the network 2) a network monitor There are known two types of LAN management functions for collecting information while transmitting information frames and inquiring about information of computers and network devices connected to a LAN, thereby monitoring faults.

Here, if a tool having both the above-mentioned LAN analyzer function and the above-mentioned LAN management function can be realized, it will be possible to more reliably monitor a network fault.

[0004]

However, in order for the tool having the LAN analyzer function to have the LAN management function, an information frame for inquiring information on computers and network devices connected to the network is required. Need to send.

[0005] In the data transmission system using the token passing method, in order to enable the information frame to be transmitted to the tool, the tool is provided with a token pass for the token passing method, that is, the token passing method. You have to join a logical ring to realize it.

However, when a tool having the LAN analyzer function is caused to participate in a logical ring for realizing the token passing method, a network must be changed. For example, in a system in which a change in a network is determined to be abnormal, There is an inconvenience that the participation of the tool in the logical ring for implementing the token passing method itself is determined to be abnormal.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a data transmission control method and apparatus capable of transmitting data without participating in a logical ring for implementing a token passing method.

[0008]

In order to achieve the above object, the invention of claim 1 controls data transmission of each station by circulating a token representing a transmission right among a plurality of stations forming a logical ring. In the data transmission control method according to the token passing method, a free time is provided between a token circulating time for circulating the token and the next token circulating time, and data of a station other than the station forming the logical ring is provided in the vacant time. Transmission is permitted.

According to a second aspect of the present invention, in the first aspect of the invention, a station other than the plurality of stations forming the logical ring monitors and monitors a communication network including the plurality of stations forming the logical ring. It is characterized by comprising a monitoring management tool for performing management.

According to a third aspect of the present invention, in the first aspect of the invention, at least one of the plurality of stations forming the logical ring is set as a management station, and another station is set as a normal station. The management station is configured to make a cycle of the token between a plurality of stations forming the logical ring to perform data transmission between a plurality of stations forming the logical ring, And a management phase for reconstructing a logical ring and performing data transmission for the notification thereof, wherein the idle time is set in the management phase.

According to a fourth aspect of the present invention, in the third aspect of the present invention, a station other than the plurality of stations forming the logical ring monitors a status indicating the idle time transmitted from the management station, Data transmission of the own station is performed in response to reception of the status.

The invention according to claim 5 includes a plurality of first stations forming a logical ring, and a second station provided separately from the plurality of first stations forming the logical ring. And
In the data transmission control device according to the token passing method for transmitting data between the first stations by circulating a token representing a transmission right between the first stations forming the logical ring, A second period during which the token is not circulated is set between a first period to be circulated between the first stations and a next first period, and the second station is configured to execute the second period within the second period. Data transmission means for performing data transmission of the second station.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the second station monitors the communication network by receiving data from a plurality of stations forming the logical ring. Communication network monitoring means for performing the data transmission of the second station during the second period, and communication network management means for managing the communication network.

According to a seventh aspect of the present invention, in the fifth aspect of the invention, at least one of the first stations includes a management station and a plurality of normal stations, and the management station includes the token Is looped between a plurality of stations forming the logical ring to perform communication between a plurality of stations forming the logical ring, and a token rounding phase for reconstructing and notifying the logical ring by the management station And setting means for setting the management phase, wherein the idle time is set in the management phase.

According to an eighth aspect of the present invention, in the invention of the seventh aspect, the second station monitors a status indicating the idle time transmitted from the management station,
Data transmission control means for transmitting transmission data of the own station in response to detection of reception of the status by the monitoring means.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a schematic block diagram showing one embodiment of a communication system configured by applying a data transmission control method and apparatus according to the present invention.

In FIG. 1, the communication system connects a plurality of stations 1 to N, 0 to a transmission line 10 to form a local area network (LAN). In this communication system, the station 1 is a management station,
The stations 2 to N are configured as normal stations, and the station 0 is configured as a network management tool.

The station (management station) 1 transmits and receives data in the same manner as the stations (normal stations) 2 to N, and transmits a logical ring of the local area network (LAN), that is, a token indicating the transmission right of each station. It manages the token circulation route that circulates between.

The station (network management tool) 0
Is introduced in the present invention, 1) a LAN analyzer function for monitoring an information frame transmitted on a network, 2) an information frame transmitted and inquired about information on computers and network devices connected on the network. A LAN management function for collecting information and performing fault monitoring is also realized.

FIG. 2 shows a logical ring of the local area network (LAN) formed on the communication system shown in FIG. In this communication system, a token (transmission right) is transferred between the stations 1 to N according to the logical ring, and N-to-N data communication is performed.

That is, in this communication system,
In the communication phase, first, a token pass is performed from the station (management station) 1, and the token sequentially circulates from the station 1 to the station N. Then, when this token comes around (the station (management station) 1 is at the beginning of this communication phase), each of the stations 1 to N can transmit this data if there is data to be transmitted to its own station.

Here, the station (network management tool) 0
Is not included in the above token pass.

FIG. 3 shows a frame configuration of an information frame used in this communication system.

The frame structure of the information frame used in this communication system is as follows: 1) a start delimiter unit indicating the start of the frame 2) a frame control unit indicating the type of the frame 3) a destination address unit indicating the destination of the frame 4) the frame Source address section indicating the source 5) Data section in which data of 0 byte or more is set 6) F for checking frame data error
CS (frame check sequence) unit 7) Consists of an end delimiter unit that indicates the end of the frame.

Here, the type of the transmission frame is determined by, for example, a 2-bit code stored in the frame control unit of the information frame. An example of a code stored in the frame control unit is as follows. 1) “01” token frame 2) “04” data frame

Therefore, when each station receives this information frame, it checks the code stored in the frame control unit of this information frame and finds that the code is "0".
If it is "1", it is determined that the token has been received.
If there is transmission data in the own station, the code of the frame control unit is set to "04", the address of the other station to be transmitted is set in the destination address unit, and the address of the own station is set in the source address unit. The transmission data is set in the data section to form an information frame as shown in FIG. 3, and the information frame is transmitted.

When the transmission of the information frame is completed, in order to transfer the received token to the next station, the address of the destination address portion of the information frame indicating the received token is reset to the address of the next station. Send an information frame indicating the token.

FIG. 4 shows a communication phase employed in this communication system.

As shown in FIG. 4, the communication phase in this communication system is composed of 1) token round phase 2) management phase, and the token round phase and the management phase are alternately repeated.

Here, the token round phase is performed by the stations 1 to
This is a communication phase in which N-to-N communication is performed between the stations N. In this token round phase, first, a station (management station)
1 and a token pass is performed.
From the station to the station N, as indicated by arrows, and each of the stations 1 to N transmits data to its own station when the token is turned (the station (management station) 1 is at the beginning of this communication phase). If there is, this data is transmitted to station 1
N-to-N communication is performed between the stations N.

In the management phase, the station (management station) 1 performs a logical ring construction process for adding or deleting another station to or from the logical ring, and notifies all stations of the processing result of the logical ring construction process. In this phase, the station (network management tool) 0 implements the LAN analyzer function and the LAN management function.

FIG. 5 shows the details of this management phase. As shown in FIG. 5, this management phase is composed of 1) a ring construction phase, 2) a ring notification phase, and 3) a WAIT phase.

Here, in the ring construction phase,
The above-mentioned station (management station) 1 performs a logical ring construction process for executing addition and deletion of another station with respect to the logical ring, and in the ring notification phase, the logical ring construction process of the ring construction phase. The information of the new logical ring is notified to all stations.

In the WAIT phase, the station (network management tool) 0 transmits a predetermined information frame to implement the LAN analyzer function and the LAN management function of the station (network management tool) 0.

That is, a station (network management tool)
0 indicates the LAN in the WAIT phase of the management phase.
An information frame for realizing the analyzer function and the LAN management function is transmitted, and the information frame is not transmitted in other periods.

In the ring notification phase, the station (management station) 1 transmits information on a new logical ring constructed by the logical ring construction processing in the ring construction phase to all stations as a ring data frame. In the frame configuration of the information frame shown in FIG.
8 "is set in the destination address part, for example," FF "indicating the broadcast address is set, and information on the logical ring newly constructed in the ring construction phase is written in the data part.

By receiving this ring data frame, each station can know the order of token circulation in the newly constructed logical ring.

In the WAIT phase, the station (network management tool) 0 transmits an information frame for realizing the LAN analyzer function and the LAN management function.

By the way, a station (network management tool)
0, as shown in FIG. 2, does not participate in the logical ring of this communication system, so that the token from the station (management station) 1 does not come around. Therefore, an information frame cannot be transmitted in the token round phase.

Therefore, this communication system is configured so that the information frame can be transmitted from the station (network management tool) 0 only during the WAIT phase of the management phase.

That is, in this communication system, when the station (network management tool) 0 detects the WAIT phase of the management phase, the station (network management tool) 0 can transmit only one information frame in one WAIT phase. It is configured.

Next, this station (network management tool)
0 will be described with reference to the flowchart shown in FIG.

In FIG. 6, after turning on the power, the station (network management tool) 0 waits for reception of an information frame. Here, in order for the station (network management tool) 0 to realize the LAN analyzer function, all the information frames transmitted through the transmission path 10 are received.

The station (network management tool) 0 first checks whether an information frame has been received (step 2).
01). If the information frame has not been received (NO in step 201), the process returns to step 201. If the information frame has been received (YES in step 201),
A LAN analyzer process is executed (Step 202).

Next, it is checked whether the received information frame is an information frame addressed to the own station (step 20).
3). Here, if the received information frame is an information frame addressed to the own station (YES in step 203), the received information frame is received (step 20).
4) Return to step 201.

If it is determined in step 203 that the received information frame is not an information frame addressed to the own station (NO in step 203), the received information frame indicates the WAIT phase of the management phase. Check whether it is a status data frame (step 20)
5).

Here, if the received information frame is not a status data frame indicating the WAIT phase of the management phase (NO in step 205), step 2
Return to 01.

If the received information frame is a status data frame indicating the WAIT phase of the management phase in step 205 (Y in step 205).
ES), it is determined that the process has entered the WAIT phase of the management phase, and then it is checked whether there is transmission data for realizing the LAN management function (step 206).

If there is no transmission data for realizing the LAN management function (NO in step 206), the process returns to step 201.

If it is determined in step 206 that there is transmission data for implementing the LAN management function (YES in step 206), the transmission data for implementing this LAN management function is transmitted (step 206). 207),
Return to step 201.

According to such a configuration, the information for realizing the LAN management function while executing the function of the LAN analyzer using the station (network management tool) 0 not participating in the logical ring of this communication system. It becomes possible to transmit and receive frames.

[0053]

As described above, according to the first aspect of the present invention, a token passing method is used in which data transmission of each station is controlled by circulating a token representing a transmission right among a plurality of stations forming a logical ring. In the data transmission control method, an idle time is provided between the token circulation time for circulating the token and the next token circulation time, and data transmission of a station other than the station forming the logical ring is permitted during the empty time. Thus, there is an effect that data transmission from a station other than the station forming the logical ring becomes possible without changing the network configuration.

According to a second aspect of the present invention, in the first aspect of the present invention, a station other than the plurality of stations forming the logical ring monitors a communication network including the plurality of stations forming the logical ring. And a monitoring management tool for performing the management.
A tool having both an analyzer function and a LAN management function can be realized.

According to a third aspect of the present invention, in the first aspect of the invention, at least one of the plurality of stations forming the logical ring is set as a management station, and the other stations are set as normal stations. The management station is configured to make a cycle of the token between a plurality of stations forming the logical ring to perform data transmission between a plurality of stations forming the logical ring, A management phase for reconstructing a logical ring and transmitting data for notification thereof, and the idle time is set in the management phase. Data transmission from a station other than the station forming the logical ring can be performed without affecting transmission.

According to a fourth aspect of the present invention, in the third aspect of the invention, the stations other than the plurality of stations forming the logical ring monitor a status indicating the idle time transmitted from the management station, Since the data transmission of the own station is performed in response to the reception of the status, the data transmission of the stations other than the station forming the logical ring becomes possible with a simple configuration.

According to a fifth aspect of the present invention, there are provided a plurality of first stations forming a logical ring, and a second station provided separately from the plurality of first stations forming the logical ring. And
In the data transmission control device according to the token passing method for transmitting data between the first stations by circulating a token representing a transmission right between the first stations forming the logical ring, A second period during which the token is not circulated during a first period during which the first station is circulated is set, and the second station transmits data of the second station within the second period. Since it is configured to include the data transmission means for performing transmission, there is an effect that the data transmission of the second station other than the station forming the logical ring becomes possible without changing the network configuration.

According to a sixth aspect of the present invention, in the fifth aspect of the invention, the second station monitors the communication network by receiving data from a plurality of stations forming the logical ring. A communication network monitoring means for performing the data transmission of the second station during the second period and a communication network management means for managing the communication network. In addition to the effect of 6, a tool having both a LAN analyzer function and a LAN management function can be realized.

According to a seventh aspect of the present invention, in the fifth aspect of the present invention, the first station has at least one management station and a plurality of normal stations, and the management station has a token. Is looped between a plurality of stations forming the logical ring to perform communication between a plurality of stations forming the logical ring, and a token rounding phase for reconstructing and notifying the logical ring by the management station And a setting means for setting the idle time, and the idle time is configured to be set within the administrative phase. Therefore, even in this configuration, data transmission through the token path by the administrative station is affected. , The data transmission of the second station becomes possible.

According to an eighth aspect of the present invention, in the seventh aspect of the invention, the second station monitors a status transmitted from the management station indicating the idle time,
Data transmission control means for transmitting the transmission data of the own station in response to the detection of the reception of the status by the monitoring means, so that the data transmission of the second station can be performed with a simple configuration. become.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing an embodiment of a communication system configured by applying a data transmission control method and device according to the present invention.

FIG. 2 is a system configuration diagram showing a logical ring of the local area network (LAN) configured on the communication system shown in FIG. 1;

FIG. 3 is a frame configuration diagram showing a frame configuration of an information frame used in the communication system shown in FIG. 1;

FIG. 4 is a diagram showing a communication phase employed in the communication system shown in FIG. 1;

FIG. 5 is a diagram showing details of a management phase shown in FIG. 4;

FIG. 6 is a flowchart showing the operation of the network management tool shown in FIG. 1;

[Explanation of symbols]

 0 station (network management tool) 1 station (management station) 2-N station (normal station) 10 transmission line

Claims (8)

[Claims] 1. A data transmission control method based on a token passing method for controlling data transmission of each station by circulating a token representing a transmission right among a plurality of stations forming a logical ring. A data transmission control method characterized by providing an idle time between a time and the next token circulation time, and permitting data transmission of stations other than the station forming the logical ring during the idle time. 2. A station other than the plurality of stations forming the logical ring comprises a monitoring management tool for monitoring and managing a communication network including the plurality of stations forming the logical ring. The data transmission control method according to claim 1. 3. A plurality of stations forming the logical ring, at least one of which is set as a management station and another station is set as a normal station, wherein the management station forms the logical ring with the token. Token rounding phase for performing data transmission between a plurality of stations forming the logical ring by making a round between a plurality of stations, and data transmission for reconstructing the logical ring and notifying the same by the management station. The data transmission control method according to claim 1, wherein: a management phase to be performed is set, and the idle time is set within the management phase. 4. A station other than the plurality of stations forming the logical ring monitors a status indicating the idle time transmitted from the management station, and performs data transmission of the own station in response to reception of the status. 4. The data transmission control method according to claim 3, wherein the method is performed. 5. A logic station comprising: a plurality of first stations forming a logical ring; and a second station provided separately from the plurality of first stations forming the logical ring. A data transmission control device according to a token passing system for transmitting data between the first stations by circulating a token representing a transmission right between the first stations to perform transmission. A second period during which the token is not circulated is set between a first period circulated between the first period and a next first period, and the second station sets the second period within the second period. A data transmission control device, comprising: data transmission means for performing station data transmission. 6. A communication network monitoring means for monitoring the communication network by receiving data from a plurality of stations forming the logical ring, wherein the second station comprises: 6. The data transmission control device according to claim 5, further comprising: communication network management means for managing the communication network by performing data transmission of the second station. 7. The first station comprises at least one management station and a plurality of normal stations, wherein the management station loops the token between a plurality of stations forming the logical ring. Setting means for setting a token round phase in which communication is performed between a plurality of stations forming the logical ring by performing the above operation, and a management phase in which the management station reconstructs the logical ring and notifies the same. The data transmission control device according to claim 5, wherein the idle time is set in the management phase. 8. The second station monitors the status indicating the idle time transmitted from the management station, and transmits the second station in response to the detection of the reception of the status by the monitoring unit. The data transmission control device according to claim 7, further comprising: data transmission control means for transmitting data.