In this paper, we first present a simulation-based evaluation of existing multipoint-to-point (mp-p) flow control schemes for ABR (Available Bit Rate) services in ATM (Asynchronous Transfer Mode) networks. The evaluation shows that these schemes suffer from one or more of the following problems: non-compliance with the selected bandwidth allocation definition (BAD), link under-utilization, and prolonged rate fluctuations. Moreover, most of them implement only one BAD, namely source-based

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... ion. We then propose a mpp flow control algorithm, the WSB (weighted-sourcebased) algorithm, that is effective and supports a large set of BADs. Experimental results are presented to demonstrate the advantages of the WSB algorithm: correct rate allocations with fast convergence, maximum link utilization, and minimal rate oscillations.