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Two techniques have been proposed in the literature to improve the scalability of QoS scheduling in the core of the Internet: flow aggregation and dynamic packet scheduling (DPS). These techniques reduce or eliminate the amount of state maintained by each router in a core network. Flow aggregation combines multiple individual flows into a single aggregate flow (and thus reducing the per-flow state...
Flow aggregation has been proposed as a technique to improve the scalability of QoS scheduling in the core of the Internet, by reducing the amount of per-flow state necessary at a router. This is accomplished by aggregating into a single flow multiple flows that share part of the same path to the destination. In its simplest form, flow aggregation is inherently non-work- conserving, that is, it may...
In the effort of reducing or eliminating per-flow state at routers, hence making QoS schedulers scalable in the core Internet, flow aggregation outperforms dynamic packet state by providing better end-to-end delay guarantee. Work-conserving flow aggregation (WCFA) has the advantage of gaining work-conserving property at the cost of an extra per-hop delay. Most research on work-conserving flow aggregation...
The Internet traditionally provides best effort service to all applications. While elastic applications are satisfied by this service, inelastic applications such as interactive audio and video suffer from end-to-end delay guarantees. Although guaranteed rate schedulers were developed to provide such guarantees, their scalability has been a concern because they maintain per-flow state. In an effort...
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