A network storm suppression method suitable for iec62439 standard

Abstract

The invention discloses a network storm suppression method applicable to the IEC62439 standard. By adding a storm filtering link on the sending and receiving links of network devices, it detects and identifies IEC62439 protocol labels, and performs storm filtering according to the content of original network packets. The PRP and HSR redundant networks described in IEC62439 all need to add protocol labels with frame numbers on the basis of original network messages. The insertion of protocol labels is generally done by the hardware coprocessor of the device, so it is actually sent to the network There is a difference in content between the original message and the original message. The method of the invention can automatically identify the IEC62439 protocol label, identify and filter network storms by comparing the original message content, and improve the availability and robustness of the entire network equipment.

Description

technical field [0001] The invention belongs to a network storm suppression method applicable to the IEC62439 standard in the field of industrial control and industrial communication, and particularly relates to a network storm suppression method applicable to a high-reliability automation network described in the IEC62439 standard. Background technique [0002] The functions of the traditional substation automation system are independent and stacked, lack of reasonable integrated application and collaborative operation, and have the disadvantages of poor data sharing ability and low utilization rate. Digital substation is the development direction of the current substation automation system, especially the promulgation of the international standard (IEC61850) for substation communication networks and systems, which provides standard specifications for the construction of digital substations and promotes the development of digital substation application construction. [0003...

AI Technical Summary

Problems solved by technology

These duplicate messages will not only occupy the effective network bandwidth, but also increase the load on the processor of the receiving device, and seriously cause the device to fail to work normally

The causes of network storms are complex and difficult to fundamentally eliminate, but the consequences of network storms are serious. For IEC62439 networks that require high reliability, the prevention and control of network storms is particularly important

[0006] In addition, in the IEC62439 network, the traditional network storm prevention function may fail for the following reasons: 1. The IEC62439 message label contains the frame sequence number field, which ranges from 0 to 65535 and increments every frame

Therefore, the contents of any two IEC62439 packets are different, resulting in the failure of the mechanism for detecting network storms based on the same packets

2. The storm messages in the IEC62439 network may show intervals, that is, normal messages and storm messages arrive alternately, which increases the difficulty of identification and filtering

However, since the length of network packets may be as high as 1500 bytes, storing and comparing packets requires a large amount of processor resources, and for situations where normal packets and storm packets arrive at intervals, or when there are multiple network storms in the network , cannot handle

[0012] To sum up, the current technical measures for storm prevention and control have no targeted measures for IEC62439 networks, and the efficiency is low and the effect is not obvious

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