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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2017/090162
Kind Code:
Provided is a layer 2 switch 20 forming a communication network along with a communication terminal, the layer 2 switch 20 being provided with: a plurality of communication ports for transmitting and receiving frames to and from a communication terminal; frame identification units 22-1 to 22-n for identifying specific frames periodically transmitted from the communication terminal to the communication network; a setting unit 231 for setting a monitoring period in which the number of the specific frames received is monitored, and a reception threshold for detecting a loop path in the communication network; a monitoring unit 232 for, in each communication port, identifying the plurality of communication terminals that are the transmission source of the received specific frames and counting the number of the specific frames received within the monitoring period for each communication terminal; and a determination unit 233 for, in each communication port, comparing the counter value of the number of specific frames received, for which a notification has been issued from the monitoring unit 232 with the reception threshold to determine whether the loop path has been detected, and performing control to stop the transmission and reception of the frames in the communication port in which the loop path has been detected.

TANIGUCHI, Sachiko (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
KAWATE, Ryusuke (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
NAKAYASU, Toshiyuki (7-3 Marunouchi 2-chome, Chiyoda-k, Tokyo 10, 〒1008310, JP)
Application Number:
Publication Date:
June 01, 2017
Filing Date:
November 26, 2015
Export Citation:
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MITSUBISHI ELECTRIC CORPORATION (7-3 Marunouchi 2-chome, Chiyoda-ku Tokyo, 10, 〒1008310, JP)
International Classes:
H04L12/28; H04L12/705
Domestic Patent References:
Foreign References:
Attorney, Agent or Firm:
TAKAMURA, Jun (Sakai International Patent Office, Toranomon Mitsui Building 8-1, Kasumigaseki 3-chome, Chiyoda-k, Tokyo 13, 〒1000013, JP)
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