Abstract: There are large numbers of bursty short flows in inter-data center backbone network.It is difficult to dynamically adapt to the traffic patterns allocating bandwidth in real-time.For the problem,a Richards model based bandwidth allocation policy (RBA) was proposed and the closed-loop feedback control system was used for real-time bandwidth allocation.Based on Richards curve,the feedback control factor of each link was designed as the feedback of the system,which can make smooth response to bursty traffic.Furthermore,according to the time delay sensitivity of flows,diffe-rent flow rate growth curves can be derived depending on different allometric parameters,which meet the QoS requirements of delay sensitive flows.Simulation on a Mininet testbed shows that the proposed policy can effectively guarantee the bandwidth for flows while ensuring the allocation fairness.

Key words: Data centers (DC),Richards,Closed-loop feedback,Bandwidth allocation,Mininet