| 摘要 |
An entry processing unit enters into a table the frame information and the reception time of a frame received by a frame reception unit. Upon the receipt of a frame by the frame reception unit, a loop judgment unit refers to the table to detect a second reception of the same frame to thereby judge the occurrence of a loop. Based on this judgment, the frame processing unit discards the received frame without sending the same, to obviate the occurrence of an infinite loop.
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