With this work, we present a scalable relative differentiated services architecture based on bandwidth shares: Scalable Bandwidth Share Differentiation (SBSD). SBSD has been designed to provide isolation and differentiation of user traffic without per-flow or per-user state at the core nodes. In addition, SBSD preserves this isolation and differentiation when being scaled over domain boundaries. The presented SBSD architecture leads to a weighted maxmin fair bandwidth distribution with respect to each user's sending rate. The novelty of the resulting fairness distribution is that ist is user-based, in contrast to traditional fairness criteria dealing with flows. Even though SBSD operates at a per-user granularity, it allows more fine-grained differentiation, which we use to demonstrate how multicast can be integrated in a straight-forward manner and how SBSD can be optimized for end-to-end TCP congestion control.
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