Abstract. In the area of network monitoring a lot of tools are already available to measure a variety of metrics. However, these tools are often limited to a single administrative domain so that no established methodology for the monitoring of network connections spanning over multiple domains currently exists. In addition, these tools only monitor the network from a technical point of view without providing meaningful network performance indicators for different user groups. These indicators should be derived from the measured basic metrics.In this paper a Service Oriented Architecture is presented which is able to perform multi-domain measurements without being limited to specific kinds of metrics. A Service Oriented Architecture has been chosen as it allows for increased flexibility and scalability in comparison to traditional software engineering techniques.

In today's IT service market customers urge providers to grant guarantees for quality of service (QoS)

A widely-distributed network monitoring system requires a scalable discovery mechanism. The "Lookup Service" component of the perJSONAR framework is able to manage component registration, distill resource data into tractable units, and respond to queries regarding system andperformance information.A model of organizing and distributing information is presented to support both dynamic environments where services frequently change as well where different administrative configuration requirements exist. These interactions are accomplished by forming 'federated hierarchies" to share information amongst the various logical overlays.1-4244-0799-0/07/$25.00 t2007 IEEE