JP2000295259A - Device for detecting abnormality in lan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep sound communication by stopping the function of a reception side LAN communication controller when message packet interruptions being a fixed number or more occur within a fixed time in the reception side LAN communication controller in packet transmission from a transmission side LAN communication controller. SOLUTION: A distribution system is constituted of computers A-E101, 111 to 114. An abnormality detecting program 116 arranged in the LAN communication controller 106 counts the number of the message packets stored in a reception buffer 117 and monitors the number of the message packet interruptions occurring within the fixed time. When the number of the message packet interruptions occurring within the fixed time is abnormally larger than an index value which is set in accordance with the performance of the computers constituting OS 105, the self processing function of the LAN communication controller 106 is stopped. A configuration control program 104 changes-over a system into the LANB one 110 in order to fetch data from the LAN communication controller 107.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a LAN abnormality detection device.

[0002]

2. Description of the Related Art Conventionally, in a distributed system in which a plurality of computer systems are connected by a LAN, when the LAN communication control device is stopped, the LAN communication control device is multiplexed.
LA stopped due to timeout monitoring by health check
By detecting the N communication control devices and switching from the stopped LAN communication control device to the normal LAN communication control device, the computer system reliability is improved.

[0003]

A failure of the LAN communication control device which does not stop but transmits an abnormal number of packets increases the load on the receiving computer OS and stops the application function of the computer or This causes the OS itself to stop. In the related art, a failure of a LAN communication control device that transmits an abnormal number of packets is detected, and the failed LAN communication control device is detected.
Switching from the communication control device to the normal LAN communication control device was impossible.

According to the present invention, a LAN communication control unit that receives an abnormal number of packets is specified, and the LAN communication control unit is stopped. Thus, the system stop range is minimized and the reliability of the computer system is reduced. It is intended to improve.

[0005]

SUMMARY OF THE INVENTION In a distributed system in which a plurality of computer systems are connected by a LAN, an error exceeding the maximum number of message packets that can be normally received by the partner computer due to a failure of the LAN communication control device of one computer. When transmitting an unusual number of packets, the abnormal number of packets generated by the LAN communication control unit of the sending computer can be transmitted by a function of the LAN communication control unit on the receiving side within a certain period of time. Detecting that a packet interruption has occurred, the function of the LAN communication control device on the receiving side is stopped, and transmission and reception are continued by a sound LAN communication control device.

Further, transmission of an abnormal number of packets generated in the LAN communication control device of the computer on the transmitting side is transmitted to the L on the receiving side.
The function of the AN communication control device detects that a message packet interrupt of a certain amount or more has occurred within a certain period of time,
The OS notifies the OS that controls the LAN communication control device of the abnormality information, and the OS stops the function of the LAN communication control device on the receiving side.

Since the present invention has the above functions, L
In response to the interruption of the abnormal number of message packets caused by the failure of the AN communication control device, the LAN communication control device receiving the abnormal number of message packets is specified, and only the specified LAN communication control device is identified. Can be stopped,
The halt range of the computer system constituted by the LAN is minimized, and the system reliability can be improved.

[0008]

Embodiments of the present invention will be described below.

FIG. 1 shows a computer A101, a computer B102, a computer C103, a computer D104, and a computer E105.
LAN109 and LAN110 connecting 5 computers to 5 computers
And a distributed system configured with the transceiver 108. The computer A101 incorporates a LAN communication control device A system 106 and a LAN communication control device B system 107, and includes an OS 105, a configuration control program 104, and a transmission processing program 10.
2. It has a software configuration including a reception processing program 103.

Computer 111, Computer 112 and Computer 11
3, the computer 114, and the computer 115 have the same software configuration and LAN communication control device. In the prior art, when an abnormal number of message packets are transmitted from the computer E via the A-system LAN 109, the computer A101 transmits an abnormal number of message packets transmitted from the computer E via the LAN communication control device A. In order to receive the packet, the load on the computer OS 105 is increased, and the transmission processing 10 lower than the OS is performed.
2. The application functions such as the reception processing 103 and the configuration control program 104 are stopped, and the OS 105 itself is stopped, that is, the computer is stopped without being able to switch to the normal LAN communication control device B system. Such a computer stoppage occurs for all the computers connected to the A-system LAN, and eventually causes the entire distributed system to stop.

The present invention is an implementation for avoiding the above-mentioned system-wide downtime.

The first embodiment will be described. As shown in FIG. 2, the LAN communication control device is provided with a transmission buffer 115, a reception buffer 117, and an abnormality detection program 116. FIG. 3 is a processing flowchart of processing for detecting a LAN abnormality in the LAN communication control device. The reception buffer stores message packets transmitted from other computers. The abnormality detection program 116 counts the number of message packets stored in the reception buffer 117 for every t seconds in the period of t seconds (301). It is determined whether or not N or more packets have been received within t seconds (302). N
Is an index value set according to the performance of the computer. If N or more packets are detected within t seconds, the LAN communication control device 106 determines that an abnormal number of message packets have been received, and stops its own LAN communication control device processing function (303). ). Due to abnormal stoppage of the LAN communication control device, an increase in the load on the OS is suppressed, and applications such as configuration control and transmission / reception programs at lower levels than the OS operate normally. The configuration control detects that the LAN communication control device 106 has stopped (304) L
System switching is performed so as to take in data from the AN communication control device 107 (305). LAN communication control device 10
7, the computer 101 operates correctly, and the suspension of the distributed system does not occur. If it is determined that the LAN communication control device 107 has also received an abnormal number of message packets, the LAN communication control device 107 has stopped its function.
Data transmission / reception via the AN is stopped (30).
6). However, an increase in the OS load due to the reception of an abnormal number of message packets is suppressed, and it is possible to prevent the computer 101 from stopping and from stopping all the computers constituting the distributed system.

[0013]

According to the present invention, it is detected that an abnormal number of packets are received on the condition that a certain number or more interrupts occur within a certain period of time in the function of the LAN communication control device. It is possible to stop the function of the LAN communication control device performing the proper reception.

[0014] Also, information that receives an abnormal number of packets is notified to the OS controlling the LAN communication control device, and
By S, the function of the LAN communication control device on the receiving side can be stopped.

[0015] Thus, after specifying the LAN communication control device that transmits an abnormal number of packets, the LAN communication control device unit can be stopped to improve the reliability of the computer system.

[Brief description of the drawings]

FIG. 1 is a diagram showing a distributed system configured by a LAN in a conventional technique.

FIG. 2 is a diagram showing a distributed system configured by a LAN, showing one embodiment of the present invention.

FIG. 3 is a flowchart illustrating a process of detecting a LAN abnormality and stopping the LAN communication control device according to an embodiment of the present invention.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K032 AA06 BA05 CA06 CC03 CD02 DB01 DB23 DB24 DB28 EA03 EA04 EA06 EA07 EB06 5K033 AA06 BA05 CA06 CB03 CC02 DA13 DB15 DB16 DB17 DB20 EA03 EA04 EA06 EA07 EB06

Claims (2)

[Claims] In a large distributed system in which a plurality of computer systems are connected by a multiplexed LAN, a LAN communication control device of one computer becomes abnormal, and all the computer systems connected to the LAN can receive data normally. When an abnormal number of message packets exceeding the maximum number of message packets are transmitted, the abnormal number of packets generated by the LAN communication control device of the transmitting computer is transmitted to the receiving LA.
N The function of the communication control unit is detected on the condition that an interrupt of a message packet of a certain number or more has occurred within a certain period of time, and the function of the LAN communication control unit on the receiving side is stopped, and a sound LA
LAN abnormality detection device that continues transmission and reception on N side. 2. In a distributed system in which a plurality of computer systems are connected by a multiplexed LAN, an error occurs in a LAN communication control device of one computer, and transmission of data which can be normally received by all the computer systems connected to the LAN. In the case where an abnormal number of message packets exceeding the maximum number of sentence packets are transmitted, the abnormal number of packets generated by the LAN communication control device of the transmitting side computer is transmitted to the receiving side LAN.
An OS (operating) that detects a condition that an interruption of a message packet of a certain number or more has occurred within a certain period of time by a function of the communication control device and controls the LAN reception control device for abnormal information.
system), and the OS stops the function of the LAN communication control device on the receiving side by the OS.