Stability analysis of a DiffServ network having two-level coloring at the network edge and preferential dropping at the core

This work presents a local stability result for differentiated services (DiffServ) networks with heterogeneous TCP flows consisting of two-level edge coloring using a token bucket, and preferentially-dropping core router. Coloring is accomplished using a recently proposed edge mechanism to adaptively tune the token-bucket rate. The result is stated for sources under TCP-Reno congestion control algorithm. Stability analysis of several DiffServ networks that were tested using ns simulations is described.