JP2525956B2 - Line backup control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention, when a line abnormality occurs in a modem network monitoring system, backs up a plurality of modems connected to the end of the line by a spare modem belonging to another monitoring polling group. , A line backup control method that enables continuous monitoring.

In a modem network monitoring system, a number of polling groups are used to monitor many modems. When a line abnormality occurs in such a system, a spare modem is prepared on the monitoring center side and, for example, a public line is used for backup. At this time, there is a demand for a technology that enables continuous monitoring even if the monitoring polling groups are different between the backup modem and the modem connected thereto and the backup modem.

[0003]

2. Description of the Related Art When trying to monitor a large number of modems with a single polling group, the polling interval for each modem increases as the number of monitored machines increases, which is not practical. Therefore, in general, a modem network monitoring system uses a plurality of polling groups to monitor many modems.

In such a system, conventionally, in order to cope with an abnormality, for example, each polling group has a spare modem. By backing up within the same line of the polling group to which it belongs, an abnormal line can be bypassed without changing the polling table that holds the polling target information. However, this method has a problem that the amount of hardware increases because it is necessary to have a backup modem for backup for each polling group.

Therefore, it is conceivable to perform backup between different polling groups. However, since polling to modems after the backed up modem becomes unreachable, humans need to find out the influence of the backup and rebuild the configuration information. Therefore, there is a problem that a lot of work is required until the backup is completed and the influence on communication work becomes large.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to use a backup backup modem commonly in all monitoring polling groups and to complete backup work quickly. And

[0007]

FIG. 1 is a diagram for explaining the principle of the present invention. In the figure, 10 is a monitoring center equipped with a computer that monitors whether or not the modem operates normally by polling, 11 is a monitoring control unit that controls polling, 12 is an affected modem detection unit, and 13 is polling. A group changing unit, 14 is a connection destination information storage unit that stores connection destination information of each modem, 15 is a polling table that manages information of modems that belong to each polling group, 16
a, 16b, ... Are input / output ports, 17a, 17b ,.
Is a polling group corresponding to each port, 18 is a modem, and 19 is a spare modem.

The monitoring control unit 11 includes ports 16a, 16
By polling via b, ..., The operation of the modem 18 belonging to each polling group 17a, 17b ,. The polling group (S) 17s is a polling group for the standby modem 19, and the port 1
It is connected to 6s.

The monitoring controller 11 uses polling to
When the line abnormality is detected, the affected modem detection unit 12 is called. The affected modem detection unit 12 refers to the connection destination information storage unit 14 to search for all modems connected after the modem that requires backup, and notifies the polling group change unit 13 of the searched modems. Polling group changing unit 13
Removes the affected affected modems from the polling group to which they currently belong and dynamically adds them to the new polling group 17s to which the spare modem 19 belongs.
The polling table 15 is updated.

[0010]

The standby modem 19 common to all polling groups is used to automatically change the configuration at the time of backup in the following procedure. (I) At the start of backup ・ When connecting each terminal, connect the connection destination modem to the connection destination information storage unit 1
Register in 4. A recursive search is performed for modems connected after the modem to be backed up based on the connection destination information storage unit 14. -The hit modem is deleted from the old polling group and added to the new polling group 17s. -Change the connection destination of the backed up modem to the backed up modem. (Ii) At the end of backup ・ In case of the changes made at the time of connection, the old data is saved in another area and restored to the state before the backup.

As described above, a common backup modem 19 can be used in the entire network having a plurality of monitoring polling groups to perform a quick backup operation.

[0012]

FIG. 2 shows a configuration example of a system to which the present invention is applied. In FIG. 2, reference numeral 20 is a host computer that performs online data processing, 21 is a dedicated line, and 22 is a public line network.

The host computer 20 communicates with a terminal connected to the host computer 20 via the modem 18 to perform data processing work. In this system, each modem 18 is connected by a dedicated line 21. The monitoring center 10
A computer is provided to monitor each modem 18 by polling. The modem 18 to be monitored has a terminal for monitoring, and responds to monitoring polling whether or not it is operating normally on a channel having a lower frequency than that used for normal data transfer. A modem without a monitoring function can be provided with such a function by an adapter, but since it is not related to the gist of the present invention, its detailed description is omitted.

A backup modem 19 is prepared for backup in case of line failure, and the backup modem 19 can be connected to each modem 18 via the public line network 22.

FIG. 3 is an explanatory view of an embodiment of the present invention.
An embodiment of the present invention will be described by taking a modem network monitoring system as shown in FIG.

The modems 18 to constitute one polling group (A) 17a. On the other hand, the spare modem 19 is a separate polling group (S) 17s. Here, the modem number of the spare modem 19 is set.

The connection destination information of each modem in the modem network monitoring system shown in FIG. 3A is registered and stored in advance as shown in FIG. 3B, for example.
In this example, the modem is connected to, the modem is connected to, and the modem is connected to.

The polling table 15 is a table for managing polling group information for indicating which port should be used for monitoring polling. As shown in FIG. 3C, there is information that the modems 18 to belong to the polling group A, and the standby modem 19 to belong to the polling group S.

In the modem network monitoring system shown in FIG. 3A, it is assumed that a line abnormality occurs at a portion marked with "X". At this time, backup is performed from the spare modem 19 provided as a common spare to the modem 18 using a public line. Then, it is necessary for the modems 18 to 13 to change their belongings from the polling group A to the polling group S. Therefore, the modem 18 connected after the first modem is searched based on the connection destination information shown in (b).

When a search is made for a modem 18 having a connection destination of, a hit is made, and then a modem 18 having a connection destination of
When a search is made for, the modem 18 with is hit. By searching recursively in this way, all affected modems can be searched. Modem 18 hit
As shown in (c), polling group A
It is deleted from the polling table 15 and is added to the polling group S to which the spare modem 19 belongs. The backup work is completed by setting the last connection destination to. If the line error marked with × returns to normal,
You can restore the original configuration by returning the old data.

FIG. 4 shows a processing flow at the time of connecting a standby modem according to an embodiment of the present invention. When a line abnormality is detected by monitoring polling, the line is backed up by the processes (a) to (e) shown in Fig. 4. (a) Compare the calling side polling group and the called side polling group, and if they are equal, proceed to processing (e). (b) If the calling side polling group and the called side polling group are not the same, the modem connected to the called side is searched based on the connection destination information. (c) Delete all searched modems from the current polling group. (d) Add all searched modems to the calling party's polling table. (e) The calling side performs line backup using the telephone line.

FIG. 5 shows a processing flow at the time of disconnection of the standby modem according to the embodiment of the present invention. When the line returns to normal and the backup ends, (a) to (e) shown in Figure 5
The backup of the line is canceled by the process of. (a) Determine whether backup was performed between different ports (polling group). If not between different ports,
Proceed to the processing of (e). (b) When backing up to another port, search for the modem connected to the called side. (c) Delete all searched modems from the current polling group. (d) Add all searched modems to the original polling table. (e) Disconnect the telephone line from the calling side and cancel the backup.

[0023]

As described above, according to the present invention,
The network administrator can quickly perform backup work for the entire network without being conscious of monitoring polling and by preparing a minimum required number of spare modems.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram showing a configuration example of a system to which the present invention is applied.

FIG. 3 is an explanatory diagram of an embodiment of the present invention.

FIG. 4 is a diagram showing a processing flow when a standby modem according to an embodiment of the present invention is connected.

FIG. 5 is a diagram showing a processing flow at the time of disconnection of a standby modem according to an embodiment of the present invention.

[Explanation of symbols]

 10 monitoring center 11 monitoring control unit 12 affected modem detection unit 13 polling group changing unit 14 connection destination information storage unit 15 polling table 16a, 16b, ... ports 17a, 17b, ... polling group 18 modem 19 standby modem

Claims (1)

(57) [Claims] 1. A modem (18) on a network, which is grouped into a plurality of polling groups (17a, 17b, ...) Corresponding to the input / output ports (16a, 16b, ...), is monitored by polling and is abnormal. In the line backup control method in the modem network monitoring system which sometimes has a function of backing up by the spare modem (19), the spare modem (19) is commonly provided for a plurality of polling groups,
When a line error occurs, the effect of searching all modems connected after the backed up modem is detected by the modem detection means (12) and the detected modems are deleted from the polling group to which they currently belong, and a spare modem is used. The polling group changing means (13) for dynamically adding to the new polling group to which (19) belongs is provided, and backup is performed by the new polling group to which the standby modem (19) belongs when a line error occurs. Line backup control method.