Explicit allocation of best-effort packet delivery service
IEEE/ACM Transactions on Networking (TON)
Transport of TCP/IP traffic over assured forwarding IP-differentiated services
IEEE Network: The Magazine of Global Internetworking
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TCP traffic that enters an IP network that supports Differentiated Services, is policed packet by packet. The border router marks differently those packets that are conforming to the Commited Information Rate (CIR) and those that are in excess and, therefore, non-conforming. The latter packets have a higher probability of being dropped in the buffers both of the border router and of the core router. This behavior has an implication when TCP sources are present. The TCP congestion control mechanism adapts the source rate to a speed that depends on the packet drop probability; therefore, in case of congestion, not only the excess traffic is dropped, but the TCP source is made to work at a speed that is even lower than the contracted CIR. In this paper, we propose a mechanism capable of controlling the amount of excess traffic that is allowed to enter the DiffServ network in a way that, even in case of congestion, the TCP throughput is not lower than the CIR.