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Deployment experience with differentiated services

While ubiquitous QoS mechanisms are not yet deployed widely across the public Internet, the Differentiated Services (diffserv) architecture has in fact proven itself to be a good match for the technical needs of many service providers. In this paper we consider the state of deployment of QoS mechanisms in large service provider IP networks (many of which happen to be offering VPN or VoIP services rather than public Internet service.) We discuss the factors that have helped and hindered the deployment of QoS mechanisms in general and diffserv in particular. We conclude that many if not most of the barriers to QoS deployment are business issues rather than technical shortcomings of the existing QoS architectures.