JPH042237A - Local area network fault monitoring method - Google Patents

Abstract

PURPOSE:To open a path at the 2nd start of this system by allowing an initializing means to initialize the information of a protocol information storage means when a means monitoring the time detects that a data stored in a means storing a data is not transferred to an information processing equipment within a specified time. CONSTITUTION:When the information processing equipment enters inoperation state, the interruption of timeout is caused from a timer circuit 310 before the start of processing (such as reception of data). In this state, a channel interface microprocessor 38 informs to a main processor 31 that the information processing equipment is inoperative. The state of communication resource stored in control memories 34, 32, 36 is initialized by control memory information storing protocol control, stored the data and the state of low-order level path. Thus, even in the case of 2nd start of the system, the communication is implemented normally without a problem.

Description

[Detailed Description of the Invention] [Summary] A local area network that controls an interface between an information processing device and a local area network transmission path, and is connected to one or more terminal devices via the local area network transmission path. Consists of a control device,
Any one of the above terminal devices is connected to a local area network connected to a plurality of local area network control devices and an information processing device via the plurality of local area network transmission paths, and is connected to a local area network connected to a plurality of local area network control devices and an information processing device, so that the information processing device can be replayed. The local area network control device includes a protocol information storage means for storing communication protocol information of the local area network, and a protocol information storage means for storing communication protocol information of the local area network, and information to be transferred to the information processing device. a means for holding data; a means for monitoring a time until the data to be transferred to the information processing device is transferred; and a means for monitoring the time, wherein the data stored in the data holding means is within a specified time. The configuration has initialization means for initializing the information in the protocol information storage means when it is detected that the protocol information is not transferred to the information processing device.

[Industrial application field]

The present invention is a local area network control device (hereinafter referred to as
The present invention relates to a method for monitoring failures in a local area network (hereinafter referred to as a LAN control device), which is connected to a local area network control device. This is to detect that a processing device (host) has become inoperable.

[Conventional technology]

Conventionally, when connecting an information processing device (host) to a local area network, as shown in Figure 4, one LA
A LAN control device 43 and a plurality of terminal devices 44 to 47 were connected to the N transmission line 41. Said L
The AN control device 43 is connected to the information processing device 42,
Terminal devices 44 to 47 are connected via a LAN transmission line 41.

In the above form, in operation (data transmission/reception in progress)
If the information processing device 42 becomes inoperable, it may become impossible to access it from the terminal devices 44 to 47 that are the two communication partners. However.

In recent years, applications that use local area networks have spread, and operational forms that perform 24-hour operation and no-down operation have appeared. Figure 1 shows its operational form. In FIG. 1, 11 and 12 are information processing devices A, B, 13
．． 14 are LAN control devices A and B. Also, 15.20
is a LAN transmission line, and 16 to 19 are terminal devices.

In the system shown in FIG. 1, two information processing devices 11, 12. LAN control device 1
3,14. LAN transmission lines 15 and 20 are duplicated.

The terminal devices 16 to 19 are physically connected to both of the LAN transmission lines 15 and 20. For example, the information processing device 11
Suppose you are running a certain business using . If the information processing device 11 goes down, the information processing device 1
Switch to 2 and execute the task.

This section explains the connection protocol for this system when starting business.

First, the LANIJW device A13 is the terminal device 16 to 19.
Make a connection with Next, the terminal devices 16 to 19 issue a connection request to the information processing device All, and are connected.

Furthermore, the protocol for closing the connection is determined between the information processing device A11 and the terminal device 1 by the terminal devices 16 to 19.
After 6 to 19 are closed, the LAN control device A13 and the terminal devices 16 to 19 are closed.

[Problems to be Solved by the Invention] In the redundant system shown in FIG. 1 based on the above protocol, if the information processing device 11 or 12 becomes inoperable for some reason, there are cases where system switching cannot be performed normally. Ta. An example of that case will be explained.

■When a failure occurs in the information processing device 11, the information processing device 1
2 (it is assumed that a device for switching is interposed between the information processing device 11 and the information processing device 12).

(2) The information processing device 12 uses the LAN1#1'4B device 14 to start (resume) communication (operation) with the terminal devices 16 to 19.

(2) The terminal devices 16 to 19 are information processing devices due to communication from the information processing device 12 occurring.

LAN [Gutter device, detects that system switching of LAN transmission line has occurred and performs blockage processing on the old route.

At this time, the terminal devices 16 to 19 are connected to the LAN control device 1.
3 and the information processing device 11, the LAN control device 13
depend on. However, the information processing device 11 is down. In other words, as mentioned above, the protocol for closing the connection is that after closing the connection between the information processing device All and the terminal devices 16 to 19 at the request of the terminal devices 11 to 6, the LAN*1m device A13 and the fourth terminal device 16 to 19
It is something that closes the gap. Therefore, blockage processing cannot be performed.

It was the information processing device 11 that went down due to a failure, and the
AN@control device 13 is not down, so
Blockage processing is not completed normally.

If the above sequence occurs, the lower-level bus (between the terminal device and the LAN control device) is not properly blocked, so after repairing the fault on host A, the active route will be reused. When I tried to do so, there was a problem that I could not use it properly.

[Problem to be solved by the invention]

The present invention was devised to solve the above problems, and when an information processing device connected to a LAN control device becomes inoperable, the LAN control device detects this and performs LAN control. This controls the state of the path within the device to its initial state so that the bus can be established normally upon restart.

[Means to solve the problem]

In order to solve the above problems, the present invention provides an information processing device (1
1, 12) and local area network transmission line (15
, 20), and is connected to one or more terminal devices f (16, 17° 18.19) via the local area network transmission path (15, 20). (13,
14), and the one or more terminal devices (16, 1
7゜18.19) via the plurality of local area network transmission paths (15, 20), a plurality of local area network control devices (13, 14),
In the local area network connected to the information processing device (11, 12), the local area network control device (13゜14) includes a protocol information storage means for storing communication protocol information of the local area network; means (37) for holding data to be transferred to the information processing device (11, 12); means (33, 310) for monitoring time until the data to be transferred to the information processing device is transferred; The monitoring means (33, 310) stores the data stored in the data holding means (37) within a specified time.
) is configured to include initialization means for initializing the information in the protocol information storage means when it is detected that the information is not transferred to the protocol information storage means.

[Effect]

means (38, 310) for performing said time monitoring;

When it is detected that the data stored in the data holding means (37) is not transferred to the information processing device (11) within a specified time, the initializing means initializes the information in the protocol information storing means. This will allow you to open a pass when you restart.

〔Example〕

FIG. 2 shows an embodiment of the present invention, and is a block diagram of the L A N @ door device 13. As shown in FIG. In the figure, 31 is a main processor that mainly controls the LAN control device 13, 32 is a control memory of the processor, 33 is a microprocessor that controls a channel interface, and 34 is a control memory of the processor.

35 is a microprocessor for transmitting and receiving data to and from the network; 36 is a control memory for the processor; 37 is a data buffer that stores transmitted and received data; 38 is a control circuit for transmitting and receiving data to and from the network; 39 is a control circuit for channel interfaces. The circuit (information processing device 11 is
Assume that they are connected via a channel. ), 31
0 is a timer circuit.

When the network transmitting/receiving circuit 38 receives data intended for the information processing device, it stores the data in the data buffer 37, and the network transmitting/receiving unit microprocessor 35 stores the data in the data buffer 37.
Checks whether the received data is normal or abnormal. 2. Abnormal data is, for example, data in which a part of the data is corrupted by noise on the transmission path and causes a CRC error. If the data is normal, the channel interface microprocessor 33 is notified via the main processor 31. The channel interface microprocessor 38 generates an interrupt for the channel to request data siphoning, and at the same time causes the timer circuit 310 to start up from the channel (data siphoning).
Instructs timer monitoring until the timer is reached. If there is activation (data download) from the channel before the timeout, the held data is transferred to the information processing device 11. Furthermore, if the information processing device 1 is in an inoperable state for some reason, a timeout interrupt is generated from the timer circuit 310 before it is activated (data is downloaded). In such a state, the channel interface microprocessor 38
It notifies the information processing device 11 that the information processing device 11 is inoperable.1 communication resources (control memory information that stores protocol control, stored data, and lower-level path status), each control memory 34 .32° held at 36).

In the embodiment, the timer circuit can detect that the information processing device has become inoperable as described above;
When a timeout is detected, it initializes communication resources (protocol control, retained data, lower-level path status) to ensure normal operation when restarted after fault repair. It is. If an information processing device becomes inoperable, the communication resources used by the information processing device will be completely initialized, so even if the information processing device is restarted, communication will continue normally without any problems. Guaranteed.

FIG. 3 illustrates the operation of channel interface microprocessor 33 for implementing the present invention.

It is a flowchart.

When notified of data reception from the main processor 31, the channel interface microprocessor 33:
Start timer monitoring for command activation (step 10)
1). If a Read command is activated from the channel before the timeout interrupt from the timer circuit 310 (steps 102 and 104), the information processing device 11 assumes that it is operating normally and stores the received data it holds. The data is transferred to the information processing device 11 and terminated normally.

If there is a timeout interrupt from the timer circuit 310 before the Read command is activated from the channel (
Steps 102 and 103) determine that the information processing device 11 is inoperable.

The main processor is notified of the initialization of communication resources (step 105).

〔effect〕

As explained above, according to the second aspect of the present invention, even if the information processing apparatus becomes inoperable and is restarted next time, it is guaranteed that communication can be performed normally without any problem.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the connection form of the local area network control device of the present invention, FIG. 2 is a block diagram of the local area network control device, FIG. 3 is an operation flowchart of the local area network control device, and FIG. FIG. 4 is an explanatory diagram of connections of a conventional local area network control device. 31 is a main processor, and 32 is a control memory. 33 is a channel interface microprocessor;
4 is a control memory, 35 is a network transmission/reception unit microprocessor, 36 is a control memory, 37 is a data buffer, 38 is a network transmission/reception control circuit, 39 is a channel interface control circuit, and 310 is a timer circuit. +5 LAN Den Haji Tomizu No.

Claims (1)

[Claims] Performs interface control between an information processing device (11, 12) and a local area network transmission path (15, 20), and controls one or more terminal devices (16, 17, 18, 1).
9) and the local area network transmission line (15,
20), and any one of the one or more terminal devices (16, 17, 18, 19) is connected to the plurality of local area network transmission paths (20). 15, 20), a plurality of local area network controllers (
13, 14), in a local area network connected to the information processing device (11, 12), the local area network control device (13, 14)
) includes protocol information storage means for storing communication protocol information of the local area network, and means () for holding data to be transferred to the information processing device (11, 12).
37), means (33, 310) for time monitoring until the data to be transferred to the information processing device is transferred, and means (37, 310) for time monitoring the time monitoring means (33, 310) for holding data. ) is characterized in that it has initialization means for initializing information in the protocol information storage means when it is detected that data stored in the device (11) is not transferred to the information processing device (11) within a specified time. Monitoring method.