Abstract
In this paper we show that UBR with adequate buffering in the ATM switches results in better overall goodput for TCP traffic than explicit rate ABR for LAN interconnection. This is shown to be true in a wide selection of scenarios. Four phenomena that may lead to bad ABR performance are identified and we test whether each of these has a significant impact on TCP goodput. This reveals that the extra delay incurred in the ABR end-systems and the overhead of RM cells account for the difference in performance. We show, however, that in an end-to-end ATM scenario where each TCP connection has its own ABR VC, ABR can achieve as good a performance as UBR, with the advantage that fairness can be controlled in the network. We observe, also, that ABR is able to improve performance when the buffering inside the ABR part of the network is small compared to that available at the ABR end-systems.
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© 1999 Springer Science+Business Media Dordrecht
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Manthorpe, S., Le Boudec, JY. (1999). A Comparison of ABR and UBR to Support TCP Traffic for LAN Interconnection. In: Danthine, A., Spaniol, O., Effelsberg, W., Ferrari, D. (eds) High-Performance Networks for Multimedia Applications. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5541-4_3
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DOI: https://doi.org/10.1007/978-1-4615-5541-4_3
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