Quality of Service (QoS) routing is concerned with routing traffic such that the QoS requirements of the carried traffic are met. This report gives an overview of the different proposals for QoS-based routing. Moreover it provides a state of the art of QoS-based routing solutions in both the IETF and the literature. To set the scene, the routing mechanisms used in PSTN, ATM and IP networks are discussed first. Next the issues involved in QoS-based routing are identified, providing a framework to evaluate QoS-based routing solutions. Next QoS-based routing solutions, related to the widely deployed intra-domain OSPF routing protocol, are evaluated. As QoS-based routing solutions, in many cases, are related to the Integrated Services concept, the interface between QoS routing and RSVP is discussed in detail. Finally miscellaneous issues w.r.t. QoS-based routing are evaluated. At the end of the report conclusions are drawn and a list of patents, concerning QoS-based routing, is provided.
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