We propose a new Per Hop Behavior (PHB) for differentiated services in IP networks. In this PHB, each network subscriber (or flow) receives a bandwidth allocation proportional to the subscribed information rate. This new PHB is called "Proportional Forwarding PHB" or PF PHB. The marking mechanism at the source or ingress router and the queuing and discard behavior at core routers are clearly described.
Three different sample marking algorithms are proposed in this document and are analyzed using simulations. It is shown that it is possible to obtain proportional bandwidth allocation using proper marking mechanism at the ingress routers and multi-level threshold- based dropping mechanism at the core routers.
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