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There is currently considerable interest in explicit congestion control protocols, which use a field in each packet to convey relatively precise information on congestion from resources to endpoints. These protocols contrast with TCP and its various enhancements, where endpoints implicitly estimate congestion from noisy information, essentially the single bit of feedback provided by a dropped or marked packet. Examples of explicit congestion control protocols include XCP and RCP. The authors shall discuss in detail the Rate Control Protocol (RCP), which uses explicit feedback from routers to allow fast convergence to an equilibrium where a bottleneck link is shared equally over flows.
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