Patent ID: 8565087

Claim:
A network transfer apparatus comprising: a bandwidth monitor for monitoring traffics for each of physical ports of the network transfer apparatus combined into a logical port; an allocation execution determiner for determining whether or not the monitored traffics exceeds a predetermined threshold for the bandwidths of the physical ports; a division executor for again allocating the traffics of the physical ports in the logical port; and an allocation result determiner for determining whether or not the traffics of each of the physical ports after allocated by the division executor, is smaller than the predetermined threshold, wherein the allocation execution determiner determines whether or not the monitored traffics is larger than the predetermined threshold in such a manner that, when the monitored traffics is larger than the predetermined threshold, the division executor allocates the monitored traffics, and when the allocation result determiner determines that the traffics of the physical ports after the allocation exceeds the predetermined threshold, the division executor again allocates the traffics; wherein a plurality of VLANs are accommodated in the logical port, and allocation of traffics of the physical ports in the logical port is made for each of he VLANs; wherein ones of the traffics of the physical ports in the logical port which have bandwidth flows of a constant or more values selected based on a predetermined judgment criterion, are allocated; and wherein the predetermined judgment criterion specifies that average bandwidth flows of the traffics are sequentially added together in a descending order of bandwidth flows and when a sum of the average bandwidth flows exceeds a constant percentage of a sum of the bandwidth flows of the traffics flowing through the logical port, the traffics are selected as an allocation target.