Network apparatus with loop detection and port shutdown capabilities
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United States of America Patent
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Sep 12, 2017
Grant Date -
Jan 7, 2016
app pub date -
Jun 17, 2015
filing date -
Jul 4, 2014
priority date (Note) -
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Abstract
According to the present invention, a network device includes a plurality of ports, a communication controller that controls communication on the each port, and a communication shutoff unit that shuts off communication on any of the ports. The communication controller includes a linkup detection unit that detects a linkup of the each port, a loop detection frame sending unit that sends a loop detection frame from a linkup detected port, which is a port for which the linkup is detected after a predetermined period from a time point when the linkup is detected by the linkup detection unit, and a loop detection frame detection unit that detects the loop detection frame if the loop detection frame is received on the each port. The communication shutoff unit shuts off communication carried out on a sending port which is a port from which the detected loop detection frame is sent.
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