BLACK: detection and preferential dropping of high bandwidth unresponsive flows

In this paper, we present the BLACK scheme that aims to prevent the unfairness problem generated by high bandwidth unresponsive flows. The scheme needs to store only a small amount of state information to maintain and exercise its fairness mechanism and utilizes a packet sampling technique that estimates both the flow’s buffer occupancy fraction and the number of active flows. When working in conjunction with RED, BLACK has shown not only to be able to handle unresponsive traffic, but also improve the fairness among TCP connections with different round-trip delays in some scenarios.