engleski

An Evaluation of the ABR Explicit-Rate Allocation Interfering with the Guaranteed Services Traffic

In this paper, we evaluate performance of the available bit rate (ABR) explicit-rate allocation in a presence of variable background traffic of the guaranteed traffic. Specifically, impact of a switch averaging interval, long-range dependence of the guaranteed traffic, and network scaling are analyzed. Both single and multiple node network cases are considered with respective simulation models. Observed performance metrics of concern include mean queue length, utilization, and allocation fairness. On the basis of the obtained results, it is observed that for both single and multiple node networks a switch averaging interval close to the longest round-trip delay fairly meets the peformance objectives of concern. In our previous work, we claim that long-range dependency (LRD) of the guaranteed services traffic could be transferred to the ABR traffic through the rate allocation. Hereby, it is shown that intensity of the transferred LRD decays as the network scaling increases.

asynchronous transfer mode; available bit rate; explicit-rate schemes; congestion avoidance; long-range dependency

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