| 摘要 |
PURPOSE:To enable packet passing control to be comducted to be conducted without increasing the load of a system. CONSTITUTION:This system is provided with chase number storage part 11e for storing the chase number of a finally transmitted packet for each pair of addresses in which either a transmission source address or a destination address is made different at least, and a chase number addition part 11b adds the chase number to the packet at the time of packet reception and continues the packet to a queue corresponding to a transmission priority level. At the time of packet transmission, a queue managing part 11f decides packets to be transmitted in the order of priority levels and reception, a chase number processing part 11g calculates a chase number Ni of the finally transmitted packet among the packets provided with the same transmission source address and the same destination address as that packet from the chase number storage part 11e, when a chase number N of a packet to be transmitted is larger than the chase number Ni of the finally transmitted packet, that packet is transmitted, the contents of the chase number storage part 11e are updated with the chase number N of the packet and when the chase number is smaller, that packet is not transmitted but abandoned.
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