Patent ID: 7911951

Claim:
A best-effort bandwidth allocating method, comprising: measuring sending amounts of packet data that are input from each of ports providing minimum bandwidth guarantee type and best-effort type communication service; calculating statistical information corresponding to an accounting subject time period of the sending amounts of the packet data of the best-effort bandwidth of each of the ports, based on the result of the measurement; changing a value of a peak information rate of a port sending out more of the packet data at a contracted communication rate to be low based on the statistical information; and impartially allocating the best-effort bandwidth to each of the ports based on the value of the peak information rate and a minimum bandwidth guarantee rate, wherein the result of the measurement of the sending amounts of the packet data input from each of the ports is reported to a host operations system; and the peak information rate of each of the ports is changed based on the statistical information reflecting average communication amounts during the accounting subject time period of the sending amounts of the packet data of the best-effort bandwidth for every port calculated by the host operations system.