| 摘要 |
An L2/L3 switch comprises a plurality of ports for transferring data and exchanges data between the ports. Information of the ports exchanging data is registered in a database stored in memory. A communication system detects reception of a specified signal. A CPU comprised in a router controls the L2/L3 switch when the communication system detects the reception of the specified signal and causes data to be exchanged only between the ports indicated in the information registered in the database and stops data transfer of the other ports among the plurality of ports.
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