Node device and obstacle detecting method

By arranging a transmission frame input and output unit and a frame number counting unit in the node device to detect the difference between the output frame number and the input frame number, the problem of frame overflow obstacles in the data communication network is solved, and broadcast storms can be prevented without limiting transmission. performance effects.

CN101335656AInactive Publication Date: 2008-12-31HITACHI LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HITACHI LTD
Filing Date
2008-06-26
Publication Date
2008-12-31
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

⚠Technical Problem

In data communication network systems, node devices are prone to frame disappearance and frame outflow obstacles when transmitting frames, especially in ring or mesh networks, resulting in loss of transmission path function or broadcast storms. The existing technology uses band Throttling prevents broadcast storms but limits the transmission performance of node devices.

⚗Method used

A node device is designed, which is equipped with a transmission frame input and output part and a transmission frame number counting part. The number of transmission frames is counted through the input frame counter and the output frame counter respectively, and the difference between the number of output frames and the number of input frames is detected within a specified time. When the number of output frames is greater than the number of input frames, it is determined as a frame outflow obstacle, and broadcast storms can be quickly detected and prevented.

🎯Benefits of technology

It realizes rapid detection and prevention of frame outflow obstacles and avoids the occurrence of broadcast storms without limiting the transmission performance of the data communication network system.

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Abstract

The present invention provides a node apparatus and an obstacle detection method, which do not limit transmit performance and can prevent broadcast windstorm. In each port control part (21), an input frame counter (214) counts the frame input from a port input terminal (24) and an output frame counter (218) counts the frame output from a port output terminal (25). A count value collecting part (233) collects the input frame number counted by the input frame counter (214) and the output frame number counted by the output frame counter (218) from each port control part (21) in every prescribed time period. An obstacle judge part (234) compares the sum of the collected input frame number with the sum of the collected output frame number, and judges that the node apparatus (2) has obstacle when the sum of the input frame number is larger than a value which is obtained by adding the sum of the output frame number with a prescribed positive constant.
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