A Congestion Aware Single Rate Three-Color Marker for Differentiated Services

The Assured Services architecture relies on packet marking mechanism at the edge router,and queue management mechanism at the core router.Due to its self-adaptive congestion,TCP flows are much more sensitive to packet drops,especially to multiple drops,therefore when network congestion happened,the throughput of TCP flows is greatly influenced.We design a new marker called CASR3CM (Congestion Aware Single Rate-Three Color Marker).The simulation results indicate that the marker not only improves the throughput of AS TCP flow,the stability of the throughput,but also improves the fairness of bandwidth sharing between AS TCP flows.