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Quality of service based value-added services in IP networks necessitate the use of traffic engineering. The latter relies typically on monitoring data for both offline, proactive and dynamic, reactive solutions. A monitoring system should be scalable in terms of network size, speed and number of customers subscribed to value-added services. This paper investigates the requirements of scalable monitoring system architectures, proposes principles for designing such systems and validates them through the design and implementation of a scalable monitoring system for QoS delivery in IP Differentiated Services networks.
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