Showing papers by "Arjan Durresi published in 1999"

Effect of number of drop precedences in assured forwarding

Abstract: This paper explores the issue of fair allocation of excess network bandwidth between congestion sensitive and insensitive flows in an assured forwarding traffic class. In the absence of any mechanism to distinguish between out-of-profile traffic of congestion sensitive and insensitive flows, congestion insensitive flows will get most of the excess network bandwidth. However, if out-of-profile packets of congestion sensitive and insensitive flows are 'colored' differently, network can be configured so as to give better treatment to excess packets of congestion sensitive flows and achieve fair allocation of excess network bandwidth. With a view to clearly distinguish between out-of-profile packets of congestion sensitive and insensitive flows, three levels of drop precedence are required. However, if the network operates close to its capacity, three levels of drop precedence are redundant as there is not much excess bandwidth to be shared.

Experience with ATM switch performance testing

Abstract: For users to be able to compare performance of different switches, it is important to have a common set of metrics. Examples of several such metrics and their measurements are presented in this paper. These measurements and metrics have impacted standardization efforts in this area. The key distinguishing feature of our effort is its emphasis on frame-level metrics (rather than cell-level metrics of the past). In particular, in this paper, we present definitions, methodologies, and measured results for frame latency, throughput, and maximum frame burst size (MFBS).

Methodology for implementing scalable test configurations in ATM switches

Abstract: In performance testing of ATM switches and networks of switches a variety of connection configurations is needed. In most of the cases, these configurations require one traffic generator and/or analyzer for each switch port. Since this equipment is rather expensive, it is desirable to define scalable configurations that can be used with a limited number of generators. In this paper we present a methodology for the implementation of scalable connection configurations. The methodology is simple and offers a general solution to generate scalable connection configurations. Several examples of scalable configurations illustrate the methodology. The application of this methodology helps users to repeat easily performance tests under the same traffic load conditions.