Network device, communication method, program, and recording medium
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United States of America Patent
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Feb 27, 2018
Issued Date -
N/A
app pub date -
Jun 24, 2015
filing date -
Jul 18, 2014
priority date (Note) -
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Abstract
According to the present invention, a network device includes a plurality of ports which are connected to a LAN; a communication controller; and a communication shutoff release unit. The communication controller includes: a linkup detection unit, a loop detection frame sending out unit that sends out the 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 to the local area network, 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 release unit releases the shutoff of the communication on the linkup detected port only if the loop detection frame is not detected by the loop detection frame detection unit.
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