摘要 |
PROBLEM TO BE SOLVED: To provide a network relay device which can suppress degradation of throughput at the time of congestion detection, and a packet transfer control method.SOLUTION: A network relay device includes: a congestion notification section 3 for adding, when a buffer quantity of a port or a queue which has detected the congestion is equal to or more than the maximum mark quantity, congestion detection information to headers of all packets which are transferred from a port or a queue; and a mark rate adjustment section 4 for decreasing the maximum mark quantity when a packet loss occurs in the port or the queue which has detected the congestion or when the buffer quantity of the port or the queue which has detected the congestion exceeds a predetermined upper limit threshold value, and for increasing the maximum mark quantity when no packet loss occurs in the port or the queue which has detected the congestion or when the buffer quantity of the port or the queue which has detected the congestion is below the upper limit threshold value. |