Buffer Management Simulation in Atm Networks

Abstract

Computer networking communications are now in the era of dedicated, high-speed switched networks. Asynchronous Transfer Mode (ATM) networks are increasing in importance because ATM technology has the ability to deliver a high quality of service, while simultaneously supporting multiple classes of traffic on the same transmission pathway. Traffic management is increasingly becoming an important focus of study in ATM networks. In this context, congestion control through adequate buffering is becoming particularly significant to minimize the probability of cell loss and cell delay when multiple large traffic bursts are received concurrently at a switch [1,2]. This paper presents a simulation of a new dynamic buffer allocation management scheme in ATM networks. To achieve this objective, an algorithm that detects congestion and updates the dynamic buffer allocation scheme was developed for the OPNET simulation package via the creation of a new ATM module. This dynamic buffer allocation scheme utilizes four identified attributes: in-use bandwidth, in-use bandwidth of distinct Quality of Service (QoS) of an incoming traffic, available number of buffers on the corresponding logical queue, and the latest short-term cell arrival rate destined to the corresponding output port. The behavior of the network under bursty traffic conditions was examined.