JPH1013409A - Method and device for detecting fault of network equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the shortening method of the detection time of a fault in the fault detection method of a network equipment by means of polling when individual communication equipments are called as network equipments. SOLUTION: A network management device 1 is provided with an adjacent storage part 12 registering adjacent network equipments for the respective network equipments. When the fault is detected by the polling of a state read part 10, a priority processing part 13 reads the adjacent network equipment from the adjacent storage part 12, changes a polling order mentioned in a monitor table 11, changes all the network equipments adjacent to the network equipment so that they are preferentially polled, successively executes polling and detects the network equipment where the fault occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network system comprising a network device and a network management device for monitoring the occurrence of a failure in the network device. A monitoring method for making an inquiry.

[0002]

2. Description of the Related Art In a conventional method for detecting a failure in a network device, a network management device periodically reads out the status of a device from a network device (hereinafter referred to as polling) based on a monitoring table held by the network management device. Was to do.

FIG. 2 shows an example of an apparatus for implementing this conventional method for detecting a failure in a network apparatus. The network management device 1 monitors the status of the network devices 2, 3, 4, and 5. Further, the network management device 1 has a status reading unit 10 and a monitoring table 11, and the status reading unit 10 periodically reads the status of the network devices registered in the monitoring table 11.

[0006] The network device 2 is connected to the network device 3 via a line 23, and further connected to the network device 5 via a line 25.

The network device 3 is connected to the network device 2 via the line 23 and further connected to the network device 4 via the line 34.

The network device 4 is connected to the network device 3 via the line 34 and further connected to the network device 5 via the line 45.

[0007] The network device 5 is connected to the lines 25 and 45.
Are connected to the network device 2 and the network device 4, respectively.

Table 1 shows the contents of the monitoring table 11. The polling is performed on the network device 2 in the cycle 1, the network device 3 in the cycle 2, the network device 4 in the cycle 3, and the network device 5 in the cycle 4. Is shown.
Further, in the next cycle, the operation returns to the cycle 1 and the network device 2
Polling is performed again, and thereafter, in the same manner, cycle 2 and cycle 3
, The polling is sequentially performed on the network devices registered in.

[0009]

[Table 1] Next, the operation of the above-described conventional example will be described. In the conventional method for detecting a failure of a network device, when the network management device 1 enters the period 1, the monitoring device 11 recognizes that the device polling at the period 1 is the network device 2, and uses the status reading unit 10 to recognize the device. The polling of the network device 2 is performed to determine whether there is a failure. Period 2
Then, the polling is performed to the network device 3, the network device 4 in the cycle 3, and the network device 5 in the cycle 4.

At this time, the network device 3
The operation in the case where the power goes down will be described. When the network device 3 goes down, the lines 23 and 34 go down, and the state reading unit 10 of the network management device 1 polls the network device 4 in cycle 3 based on the monitoring table 11, and the line 34 goes down. The user knows that a failure has occurred, but does not recognize that the network device 3 has gone down. Further, in period 4, the network device 5 is polled, and in period 1, the network device 2 is polled to recognize that the line 23 has failed. When polling is performed on the network device 3 for the first time in the subsequent cycle 2, it is recognized that the network device 3 is down because there is no response from the network device 3.

[0011]

In the above-described conventional method for detecting a failure of a network device, since only the status of each network device is periodically checked, a catastrophic failure such as a device down occurs and a line failure occurs. For example, there is a problem in that even if a peripheral device detects the information, the information is not used, and the discovery of a failure is delayed.

An object of the present invention is to provide a method for detecting a failure of a network device which can detect a fatal failure such as a network device failure at an early stage even if the monitoring method is performed by periodic polling from a network management device. It is to provide the device.

[0013]

According to the method for detecting a failure in a network device of the present invention, when each communication device of a network constituted by a plurality of communication devices connected by a plurality of lines is called a network device, Network device fault detection method by polling in which a network management device periodically inquires all network devices for a status in a network system including a network device of the type described above and a network management device monitoring the occurrence of a fault in the network device , The network management device has a step of recording adjacent network devices for each network device, and a step of, when detecting the occurrence of a failure in any network device, giving priority to the adjacent network device for status inquiry. .

In the case where there are a plurality of adjacent network devices, the order of the network devices that perform the priority state inquiry is a predetermined polling order, and the predetermined polling order is restored after detecting a failure of the network device. I do.

The network device fault detecting apparatus according to the present invention, when each communication apparatus of a network configured by connecting a plurality of communication apparatuses by a plurality of lines is referred to as a network apparatus, is connected to all network apparatuses. A network management device for monitoring the occurrence of a failure in a network device, the network management device in a network system comprising: The device has a storage device for storing adjacent network devices for each network device, and a priority processing means for giving priority to the adjacent network device when a failure of any network device is detected.

As described above, the present invention utilizes an event that when a fatal failure such as a network device failure occurs, an adjacent device detects the failure as a line failure.
Each network device has information on its neighboring devices in the network management device, and when a failure is detected in a certain device by polling, priority is given to checking the status of the neighboring device to prevent a failure such as a device failure. It can be detected early.

[0017]

Next, an embodiment of the present invention will be described.

FIG. 3 is a flowchart showing the concept of a method for detecting a failure in a network device according to the present invention.

In the method for detecting a failure of a network device according to the present invention, the network management device stores adjacent network devices for each network device (step 51), and during polling of status reading, a failure is generated by polling of a certain network device. Is detected (step 52), the network device name of the network device adjacent to the network device in which the failure is detected is read (step 53). Polling is sequentially performed on the read network devices according to the original polling order, and the presence or absence of a failure is detected (steps 54 and 55). When the polling of the last neighboring network device is completed, the polling of the status reading is restarted from the network device of the next polling order (step 56).

FIG. 1 shows the configuration of a first embodiment of a device to which the network device fault detection method of the present invention is applied.
The network management device 1 monitors the status of the network devices 2, 3, 4, and 5. The network management device 1 has a status reading unit 10 and a monitoring table 11, and the status reading unit 10 registers the status in the monitoring table 11. Polling is periodically performed for the network device that is being used. Up to this point, the monitoring device is the same as the monitoring device of the fault detecting device of the conventional network device. However, according to the present invention, further, the adjacent storage device 12 storing the adjacent network device for each network device, The priority processing unit 13 that determines a network device to perform polling in the next cycle based on the information of the above and rewrites the monitoring table 11 is added.

The network configuration is the same as that shown in the conventional example. The network device 2 is connected to the network device 3 via a line 23.
It is connected to the network device 5 via a line 25.

The network device 3 is connected to the network device 2 via the line 23, and further connected to the network device 4 via the line 34.

The network device 4 is connected to the network device 3 via the line 34, and further connected to the network device 5 via the line 45.

Further, the network device 5 is connected to the line 2
5 and 45 indicate that they are connected to the network device 2 and the network device 4, respectively.

Table 2 is a table showing the contents of the monitoring table 11. The contents are the same as Table 1 shown in the conventional example. That is, the polling is performed on the network device 2 in the cycle 1, the network device 3 in the cycle 2, the network device 4 in the cycle 3, and the network device 5 in the cycle 4. Further, in the next cycle, the process returns to the cycle 1 and polling of the network device 2 is performed again. Thereafter, similarly, the network devices registered in the cycles 2 and 3 are sequentially polled.

[0026]

[Table 2] Table 3 shows information stored in the adjacent storage unit 12 of the present invention. In Table 3, the devices adjacent to the network device 2 are the network devices 3 and 5, the devices adjacent to the network device 3 are the network devices 2 and 4, and the devices adjacent to the network device 4 are the network devices 3 and 5. The device 5 and the network device 5 are adjacent to the network device 2 and the network device 4, respectively.

[0027]

[Table 3] Next, the operation of the failure detection device for a network device according to the present invention will be described. The network management device 1 recognizes from the monitoring table 11 that the device monitored at the period 1 is the network device 2 at the period 1, and polls the network device 2 using the status reading unit 10 to check whether there is a failure. I will.

Similarly, polling is performed on the network device 3 in the cycle 2, on the network device 4 in the cycle 3, and on the network device 5 in the cycle 4. The operation so far is the same as in the conventional example.

Here, the operation of the present invention when the network device 3 goes down at the time of period 3 will be described.

When the network device 3 goes down, the lines 23 and 34 go down. The status reading unit 10 of the network management device 1 reads the status of the network device 4 by the monitoring table 11 in the cycle 3, and detects that the line 34 has failed. For this reason, the priority processing unit 13 of the network management device 1 reads out the neighboring device of the network device 4 from the neighboring storage unit 12, recognizes that the neighboring devices are the network device 3 and the network device 5, and The state reading device in the period 4 is the network device 3, and the state reading in the next period 1 is the network device 5.
The contents of the monitoring table 11 are rewritten.

Table 4 shows the contents of the monitoring table 11 rewritten by the operation of the priority processing unit 13.

In the next cycle 4, the state reading unit 10
Recognizes from the monitoring table 10 that the reading device in the cycle 4 is the network device 3, polls the network device 3,
Is detected to be down. In this operation example, the down of the network device 3 is detected two cycles earlier than in the conventional example.

[0033]

[Table 4]

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a first embodiment of a failure detecting device for a network device according to the present invention, the priority processing unit 13 rewrites the contents of the monitoring table 11 based on the information in the adjacent storage unit 12 when detecting a failure in the network device. Although the method has been described, a method in which the priority processing unit 13 performs polling by itself based on the information of the adjacent storage unit 12 may be used as the second embodiment.

[0035]

As described above, according to the present invention, the network management device has information of the adjacent device for each network device for each network management device, and when a failure is detected in a certain device, the network management device gives priority to the adjacent device. By performing polling, a fatal failure such as a device down can be detected early. In particular, when the number of network devices to be managed is large, the polling cycle per device becomes long, and the effect of the present invention is great.

[Brief description of the drawings]

FIG. 1 is a block diagram of a first embodiment of a network device fault detection apparatus to which a network device fault detection method according to the present invention is applied.

FIG. 2 is a configuration block diagram showing an embodiment of a conventional failure detection device for a network device.

FIG. 3 is a flowchart illustrating the concept of a failure detection method for a network device according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 network management device 2 network device 3 network device 4 network device 5 network device 10 status reading unit 11 monitoring table 12 adjacent storage unit 13 priority processing unit 23 lines 34 lines 45 lines 25 lines

Claims (4)

[Claims] When each communication device of a network configured by connecting a plurality of communication devices via a plurality of lines is referred to as a network device, all network devices and a network management for monitoring the occurrence of a failure in the network device. In a method for detecting a failure of a network device by polling in which a network management device in a network system composed of a network device periodically inquires the status of all network devices, the network management device comprises: And a step of giving priority to an adjacent network device when a failure of an arbitrary network device is detected, and performing a status inquiry with priority. 2. The method according to claim 1, wherein, when there are a plurality of adjacent network devices, the order of the network devices performing the priority state inquiry is a predetermined polling order. 3. The method for detecting a failure in a network device according to claim 2, wherein the predetermined polling order is restored after the failure in the network device is detected. 4. When a plurality of communication devices are connected by a plurality of lines and each communication device of the network is referred to as a network device, all the network devices and a network management for monitoring the occurrence of a failure in the network device. A network management device in a network system comprising a network device, wherein the network management device periodically polls all network devices for a status inquiry, and wherein the network management device is adjacent to each network device. A failure detecting device for a network device, comprising: a storage device for storing the information of the network device; .