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Multi-domain monitoring aims at guaranteeing QoS for services crossing several domains. It is often desirable to perform global monitoring to guarantee end-to-end QoS for services across domains and to reduce the monitoring cost. However, global monitoring might be infeasible due to confidentiality constraints. The alternative solution is to perform per-domain monitoring. In this paper, the authors propose to evaluate global and per-domain monitoring techniques. For this end, they study the properties of multi-domain networks and the requirements of multi-domain monitoring. They formulate the problem as an Integer Linear Program (ILP).
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