| 摘要 |
A transmitting unit includes a plurality of ports, and transmits a monitor packet from a port corresponding to a target network to be monitored. An extracting unit extracts transmitted monitor packet from received packets. A judging unit judges whether a loop is formed in a network that is configure by connecting a plurality of communication devices, based on a transmission-source address of extracted monitor packet. A blocking unit blocks, when it is judged that the loop is formed in the network, the port from which the monitor packet has been transmitted.
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