JP2612117B2 - Network monitoring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network monitoring system applied to a data transmission system such as a local area network.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a system configuration diagram showing a conventional data transmission system disclosed in Japanese Unexamined Patent Publication. In the figure, 1 is a transmission line, 2a is a monitoring station, and 3a to 3b are stations.

Next, the operation will be described. The monitoring station 2a and each of the stations 3a to 3b are connected to the transmission line 1
Data transmission with each other via the. The monitoring station 2a monitors the status of each of the stations 3a to 3b.

[0004] Each station 3a to 3b obtains the transmission right in order so as to enable the state monitoring (see FIG. 11).
Status notification data (hereinafter also referred to as RAS frame) including failure information (hereinafter also referred to as RAS information) is periodically transmitted to the monitoring station 2a. The monitoring station 2a receives the RAS frame, and
The AS frame is stored in the RAS information buffer 21 as shown in FIG.

Further, the monitoring station 2a checks all RAS information in the RAS information buffer 21 at a predetermined cycle. Then, the state of each of the stations 3a to 3b is recognized from the RAS information of each of the stations 3a to 3b, and whether or not the RAS information is transmitted is confirmed. R
If the AS information has not been transmitted, a failure has occurred in the station corresponding to the RAS information. Alternatively, it is determined that the station has left the network.

FIG. 13 is a system configuration diagram showing another conventional data transmission system. In the figure, 1 is a transmission path,
4a to 4d are transmission control devices (stations).

Next, the operation will be described. The stations 4a to 4d perform data transmission with each other via the transmission path 1. Each of the stations 4a to 4d monitors the status of the other stations 4a to 4d.

Each station 4a to 4d periodically broadcasts an RAS frame as shown in FIG. 14 to all other stations so that the status can be monitored.

[0009] In addition to the start flag 61 and the end flag 64, the RAS frame includes RAS information 62 and a count value 6
Contains three. The RAS information 62 includes a large number of bits. For example, one bit is assigned to one failure factor, and when a failure occurs, the corresponding bit is set to “1”. The count value 63 is incremented by one each time a RAS frame is transmitted, and is reset to an initial value when the count value reaches a certain value.

Assuming that the station 4a has transmitted the RAS frame, the other stations 4b to 4d
When an AS frame is received, R
By comparing the AS information 62 with the previously received RAS information 62, it is possible to detect the occurrence of the failure of the station 4a or the recovery from the failure from the change in the value.

The other stations 4b to 4d operate when the count value relating to the station 4a previously received and stored in the own station does not increase within a predetermined time, that is, within a predetermined time. If no RAS frame has been received from the STA, it is determined that the station 4a has become unable to transmit or has left the network. Further, the station corresponding to the count value at which the increase has restarted can be determined to have newly entered or re-entered the network. As described above, each of the stations 4a to 4d can always recognize the state of the other stations.

[0012]

Since the conventional network monitoring system is configured as described above, it is necessary to check the RAS information of all the stations that can enter the network. The RAS information and the count value must also be checked for a station that has not entered the network or a station that has left the network, and there has been a problem that the station monitoring process is inefficient.

Further, since the status of all the stations that can enter the network is monitored, the RAS
There is a problem that the transmission interval of the frame cannot be shortened, and the transmission disable state of the station and the departure from the network cannot be detected quickly.

The present invention has been made to solve the above problems, and has as its object to obtain a network monitoring method for more efficiently monitoring the status of each station.

[0015]

According to a first aspect of the present invention, there is provided a network monitoring system in which a RAS information of a local station is periodically transmitted to each station in a system provided with a monitoring station for monitoring each station. a failure information transmitting unit that, the self-station transmission right
When receiving a request signal requesting a station number to give and receive, a station number notifying unit that notifies the number of the station to which the own station gives and receives the transmission right ,
A request signal is sent to each monitoring station, and the status transmitted by each station is sent to the monitoring station.
Entry station recognition unit for recognizing all stations that are currently participating in the network by the transmission path based on the application number , and each station received via the transmission path for the stations recognized by the entry station recognition unit. And a failure information processing unit for inspecting the RAS information.

In a network monitoring system according to a second aspect of the present invention, in a system provided with a plurality of stations, each station is provided with the R of its own station.
A failure information transmitting unit that periodically broadcasts AS information, and a station to which the own station gives and receives a transmission right when receiving a request signal requesting a station number to which the own station gives and receives the transmission right. And a station number notifying section for notifying the request signal to at least one of the stations, and transmitting a request signal to the other station based on the station number transmitted by the other station. A target station recognition unit that recognizes all stations currently participating in the network, and a target station that is recognized by the target station recognition unit.
A failure information processing unit for inspecting the RAS information of each station received via the transmission path.

According to a third aspect of the present invention, in the network monitoring method according to the second aspect of the present invention, the own station transmits an entry station recognition unit.
When a request signal is sent to the station that passes the right
In both cases, the transmission right, which is the response signal to the request signal, is passed.
Station number and station number to receive the transmission right
The station number that receives and passes the right to send
Station number to pass the transmission right
Processing for transmitting the request signal to the station indicated by the number
And pass the transmission right received by the request signal
Until the station number matches the own station number
The station number collection unit that continues the process, and each request
Each station indicated by the station number that passes the transmission right received for the signal has an entry address table registered as a station participating in the network.

Further, a net according to the invention of claim 4 is provided.
The work monitoring method is the same as the method according to the second aspect of the invention.
And the local station sends the entry station recognition unit.
Send request signal to trusted station
Together with the transmission right which is a response signal of the request signal
Station number and station number to receive transmission right
And the station number receiving the transmission right
If it is not the station number,
The request signal is transmitted to the station indicated by the
The transmission right received by the request signal.
Station number to receive matches own station number
Station number collection unit that continues the process until
To receive the transmission right received for each request signal.
Each station indicated by the application number joins the network.
Entry address registered as the joining station
And a table.

[0019]

The joining station recognition unit according to the first and second aspects of the present invention collects the numbers of the stations currently joining the network.

Further, entry station recognition unit in the third aspect of the present invention and according to claim 4 sets the number of each station have entered currently network entry address table.

[0021]

[Embodiment 1] FIG. 1 is a system configuration diagram showing a data transmission system to which a network monitoring system according to a first embodiment of the present invention is applied. In the figure, 1 is a transmission line, 2 is a monitoring station, and 3A to 3B are stations.

In the monitoring station 2, reference numeral 21 denotes an RAS information buffer in which RAS frames received from the stations 3A to 3B are stored; 22, a ring map information in which the station number included in the map frame is set; An entry station recognition unit for transmitting a ring map request (request signal) and setting the ring map information 22 is a failure information processing unit for checking RAS information.

In each of the stations 3A to 3B, a failure information transmitting unit 31 for transmitting an RAS frame;
Reference numeral 32 denotes a station number notifying unit that sends a map frame in response to a ring map request.

[0024] Next, the operation will be described. The participating station recognition unit 23 of the monitoring station 2 broadcasts a ring map request to each of the stations 3A to 3B at a fixed cycle. Each of the stations 3A and 3B transmits the map frame shown in FIG.

The map frame includes the own station number,
It contains the upstream station number and the downstream station number. Here, the upstream station and the downstream station
Upstream stations are defined as
Station that receives the right to send
For example, SNT1 (station number "1")
If the station is the local station, the transmission right is granted to STN1.
The handover STN4 becomes the upstream station (see FIG. 11).
See). Also, the downstream station is
A station that transfers the transmission right. For example, ST
Assuming that N1 is its own station, STN1 grants the transmission right.
The receiving STN2 becomes a downstream station.

When the entry station recognition unit 23 receives the map frame, it creates ring map information 22 as shown in FIG. Further, the ring map information 22 is transmitted from the own station (in this case, STN1) in the upstream direction (the upstream direction is defined as
The direction toward the upstream station) or the downstream direction (the downstream direction is the direction toward the downstream station ).
Direction) . Then, when reaching the station number of the own station, it is possible to recognize that each station existing on the route taken is the one that is currently participating in the network. FIG. 4 is an example of a case where the ring map information 22 shown in FIG. 3 is traced in the downstream direction.

In this way, the participating station recognition section 23 can reliably recognize the participating stations. Then, among the RAS valid flags of the RAS information buffer 21 in which the information setting area is prepared for all the stations that can participate in the network, the one corresponding to the participating station is turned on as shown in FIG. I do.

[0028] of the monitoring station 2 failure information processing unit 24
Inspects each RAS information in the RAS information buffer 21 at regular intervals, as in the conventional case. In this case,
Only RAS information for which the RAS valid flag is ON is targeted. It should be noted that the failure information transmitting unit 31 of each of the stations 3A to 3B periodically sends out the RAS frame, and when the monitoring station 2 receives the RAS frame, it stores it in the RAS information buffer 21 in the conventional manner. It is running as if.

Embodiment 2 FIG . FIG. 6 is a system configuration diagram showing a data transmission system to which a network monitoring system according to a second embodiment of the present invention is applied. In the figure, 1 is a transmission line, 4A and 4B are transmission control devices, and 5 is a network monitoring device. In addition,
Although only two transmission control devices 4A and 4B are shown in the figure, the number is not limited. Further, although the network monitoring device 5 is attached only to the transmission control device 4A, it may be attached to all the transmission control devices 4A and 4B.

In the transmission control devices 4A and 4B, 41 is a media access control unit for interfacing with the transmission line 1, 42 is a status notification data generation unit for generating RAS frames, and 43 is a failure information generation unit for generating RAS information. , 44 are count value setting units for setting count values, and 45 is for recognizing the upstream station and the downstream station of the own station.
A station number recognizing unit 46 is a station number notifying unit that creates a map frame.

In the network monitoring apparatus 5, 51 is a status notification data decomposing unit for decomposing the received RAS frame, 52 is a failure information comparing unit for checking RAS information, and
3 is a count value comparing unit for checking the count value, and 54 receives the map frame and sets the entry address table 55.
Station number collection unit . Reference numeral 56 denotes a display device on which failure information and the like are displayed.

[0032] Here, the state notification data creation unit 42, the failure information creation unit 43 and the count value setting unit 44 is an implementation of the failure information transmitting unit, the state notification data decomposition section 51, failure information comparing unit 52 and the count value The comparison unit 53 is an example of a failure information processing unit. The station number collection unit 54 and the entry address table 55 are examples of the implementation of the entry station recognition unit.

Hereinafter , a combination of the transmission control device 4A and the network monitoring device 5 will be referred to as a station 4.
A, the transmission control device 4B is expressed as a station 4B.

[0034] Next, the operation will be described. The stations 4A and 4B transmit data to the transmission path 1 and receive data from the transmission path 1 through the media access control unit 41. Furthermore, each station 4A, 4B Stacy of
The station number recognition unit 45 periodically executes a transmission procedure for recognizing an upstream station and a downstream station of the own station. Then, it recognizes the number of the upstream station and the number of the downstream station and holds them.

The station number collection of the station 4A
The unit 54 periodically creates or updates the entry address table 55. Here, a method of creating the entry address table 55 for the system shown in FIG. 7 will be described with reference to the flowchart in FIG.

In FIG . 7, reference numerals 4C to 4H denote stations having the same configuration as the station 4B. First,
The station number collection unit 54 of the station 4A obtains the number of the upstream station or the downstream station of the own station from the station number recognition unit 45 (Step ST1). Next, the station number collection unit 5
4 transmits a map frame request to the station indicated by the upstream station number (in this case, station 4B) (step ST2).

In the station 4B, the station
In response to the map frame request, the number notification unit 46
Is transmitted to the station 4A. When the station 4A receives the map frame, the station number collection unit 54 analyzes the map frame. If the map frame is not received within a predetermined time, it is considered that the table creation has failed, and the process proceeds to step ST1.
Return (steps ST3 and ST5).

If the upstream station number of the map frame (in this case, the station 4C) is not the station number of the own station (the number of the station 4A), the station indicated by the upstream station number (in this case, the station 4C) ) Is transmitted (steps ST6 and ST2). Then, the processing of steps ST3 to ST6 is repeated until a map frame whose upstream station number indicates the station number of the own station (the number of the station 4A) is received.

When the upstream station number of the received map frame indicates the other stations 4B to 4H that have already transmitted the map frame, it is determined that the table creation has failed (steps ST4 and ST5).

[0040] The station number of the upstream station is
Map showing station numbers (station 4A numbers)
When a frame is received,Station number collection unit 54
Are all the stations that have sent the map frame so far.
4B to 4H, their upstream station numbers
And the entry address table with the downstream station number
Bull 55. In this case, each switch is
Explain the case of following stations 4B to 4H
However, it may follow the downstream direction. Also enter
FIG. 9 shows an example of the address table 55.

[0041] Further, (for example, station 4C.) Freshly station that has entered the network, scan
The station number recognition unit 45 recognizes the upstream station and the downstream station of the own station. Then, the station number notifying unit 46 broadcasts the map frame. Also, the station number
Also when the recognition unit 45 detects a change in the upstream and downstream stations, the station number notification unit 46 broadcasts a map frame.

When the station 4A receives the map frame transmitted by the station 4C, the station 4A
Creates the entry address table 55 according to the flowchart of FIG. Then, the station 4A stay
The application number collection unit 54 compares the created entry address table 55 with the entry address table 55 created last time, and detects a station 4C that has newly joined or a station that has left.

It should be noted that the entry address table 55 created periodically is also the entry address table 5 created last time.
5 is used to detect a station newly entering or leaving the network.

The state notification data generating unit 42 of each station 4A~4H is, RAS failure information creation unit 43 creates
An RAS frame is created from the information and the count value set by the count value setting unit 44 in the same manner as in the related art, and the RAS frame is broadcast-transmitted.

[0045] Then, the state notification data decomposition unit 51 of the station 4A receives the RAS frame, to extract it from the RAS information and count. Further, the failure information comparing unit 52 compares the received RAS information with the previously received RAS information.
The information is compared with the information to recognize occurrence of a failure or recovery from the failure.

The count value comparing section 53 sets the received count value in the count value table. Then, the count value comparing unit 53 checks each count value in the count value table at a fixed cycle. However, in this case, only the stations corresponding to the stations set in the entry address table 55 are to be inspected. In the conventional case, the count value is checked for all stations that may enter the network. Then, by this inspection, that is, by detecting that there is no increase in the count value, it is recognized that each station cannot transmit or has left.

The detected status change of each station is displayed on the display device 56 and notified to the outside.

It should be noted that there is no problem even if the creation cycle of the entry address table 55 is sufficiently longer than the transmission cycle of the RAS frame. This is because the necessity to newly add to the entry address table 55, that is, to detect a new entry station, is not so high as compared to the necessity of detecting a station leaving or the like due to the stop of the increase in the count value. Therefore, the increase in load caused by the creation of the entry address table 55 is not so large.

[0049]

As described above, according to the first aspect of the present invention, a network monitoring system is provided,
Stations that are currently participating in the network are recognized, and the state is monitored only for those stations. Therefore, an effect that the efficiency of monitoring processing of the monitoring station is improved can be obtained.

In addition, according to the second aspect of the present invention, the network monitoring method, any one or more stations, and recognizes the station that is entered currently the network, monitor the status only for those stations With the configuration, there is an effect that the efficiency of monitoring processing of each station can be improved and a station that can quickly detect a change in network state can be obtained.

[0051] Then, according to the third aspect of the present invention, the network monitoring method, when creating the entry address table, since the configuration as traced a station passes the transmission right, entered current network When recognizing a station, there is an effect that the inconsistent table is not created and the station can be quickly and reliably recognized .

[0052] Further, according to the fourth aspect of the invention,
Create the entry address table using the network monitoring method.
Follow the station to receive the right to send
Is currently entering the network
Inconsistent tables are created when recognizing stations
The effect that can be quickly and reliably recognized without being
You.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing a data transmission system to which a network monitoring system according to a first embodiment of the present invention is applied.

FIG. 2 is an explanatory diagram showing a configuration of a map frame.

FIG. 3 is an explanatory diagram showing ring map information.

FIG. 4 is an explanatory diagram showing how to follow a station in ring map information.

FIG. 5 is an explanatory diagram showing a configuration of an RAS information buffer.

FIG. 6 is a system configuration diagram showing a data transmission system to which a network monitoring system according to a second embodiment of the present invention is applied.

FIG. 7 is a system configuration diagram showing a data transmission system provided with a large number of stations.

FIG. 8 is a flowchart illustrating an operation of a station number collection unit .

FIG. 9 is an explanatory diagram showing a participation address table, a RAS information table, and a count value table.

FIG. 10 is a system configuration diagram showing a conventional data transmission system.

FIG. 11 is an explanatory diagram for explaining transfer of a transmission right.

FIG. 12 is an explanatory diagram showing a configuration of a conventional RAS information buffer.

FIG. 13 is a system configuration diagram showing another conventional data transmission system.

FIG. 14 is an explanatory diagram showing a configuration of a RAS frame.

[Explanation of symbols]

23 Entry station recognition unit 24 Failure information processing unit 31 Failure information transmission unit 32 Station number notification unit 42 Status notification data creation unit (failure information transmission unit) 43 Failure information creation unit (failure information transmission unit) 44 Count value setting unit (failure) Information transmitting unit) 46 station number notifying unit 51 state notification data decomposing unit (fault information processing unit) 52 fault information comparing unit (fault information processing unit) 53 count value comparing unit (fault information processing unit) 54 station number collecting unit (entry) (Station recognition unit) 55 Entry address table (Entry station recognition unit)

Claims (4)

(57) [Claims] 1. In a network monitoring system in which a monitoring station connected to a transmission path and a plurality of stations monitor each station in a data transmission system that performs data transmission with each other via the transmission path, each of the stations is self-contained. a failure information transmitting unit that transmits the failure information of the station periodically, the own station transmission right
And a station number notifying unit that notifies a station number of a station to which the own station gives and receives a transmission right when receiving a request signal requesting the number of a station that gives and receives the station. An entry station recognition unit for transmitting the request signal to a station and recognizing all stations participating in the network by the transmission path based on a station number transmitted by each station in response to the request signal. And a failure information processing unit for inspecting failure information of each station received via the transmission line for the stations recognized by the entry station recognition unit. 2. In a network monitoring system in which monitoring stations connected to a transmission path monitor each station in a data transmission system that performs data transmission with each other via the transmission path, each of the stations includes failure information of its own station. Information transmission unit that periodically broadcasts the data, and the own station gives and receives the transmission right.
And a station number notifying unit for notifying the number of the station to which the own station gives and receives the transmission right when receiving a request signal requesting the number of the station , wherein at least one of the stations further comprises: An entry for transmitting the request signal to another station and recognizing all other stations participating in the network by the transmission path based on a station number transmitted by another station in response to the request signal. A network monitoring method, comprising: a station recognition unit; and a failure information processing unit that checks failure information of each station received via the transmission line for a station recognized by the entry station recognition unit. . 3. The participating station recognizing section sends a request signal to a station to which the own station passes a transmission right.
Transmission right, which is a response signal to the request signal
Station number to hand over and station to receive transmission right
Station number to receive the
If it is not its own station number, the
Request signal to the station indicated by the
To start the transmission process
The station number that passes the right matches the own station number
Station number collection unit that continues the process until
3. The network monitoring system according to claim 2, wherein each station indicated by the station number for passing the transmission right received for each request signal has an entry address table registered as a station participating in the network. method. (4) The entry station recognition unit
Sends a request signal to the receiving station.
Send and send a response signal to the request signal
Station number to give right and station to receive right to send
Station number that receives the
If the number is not its own station number,
The request signal is sent to the station indicated by the station number
Starts the process of transmitting the
Station number to receive the transmission right
Station number to continue the process until it matches the number
Receives the transmission right received for the collection unit and each request signal
Each station indicated by the station number is
Network registered as a participating station
3. The network according to claim 2, comprising a dress table.
Monitoring method.