AQM GENERALIZED NYQUIST STABILITY IN MULTIPLE BOTTLENECK NETWORKS

摘要

The in°uence of multiple bottlenecks on the stability of Active Queue Management (AQM) controllers, usually conˉgured on a single bottleneck basis is discussed. We consider a network scenario where RED is conˉgured at each router according to previously developed control theoretic techniques. These conˉguration rules assure stability in a single bottleneck scenario. We show that instability may arise when two links become congested. We justify this result through a multiple bottleneck model using the Generalized Nyquist stability criterion .