The Internet is currently being confronted with service demands from a new generation of applications. Supporting these applications effectively and efficiently will require extending the current Internet "best-effort" service model to one that offers an integrated suite of services. The purpose of this memo (which is derived primarily from [34]) is to describe a proposed "core" service model for an integrated services Internet. In the Appendix we discuss the process by which such a service model could be standardized by the Internet.

This memo discusses a proposed extension to the Internet architecture and protocols to provide integrated services, i.e., to support real-time as well as the current non-realtime service of IP. This extension is necessary to meet the growing need for real-time service for a variety of new applications, including teleconferencing, remote seminars, telescience, and distributed simulation. This memo represents the direct product of recent work by Dave Clark, Scott Shenker, Lixia Zhang, Deborah Estrin, Sugih Jamin, John Wroclawski, Shai Herzog, and Bob Braden, and indirectly draws upon the work of many others. Contents 1 Introduction 2 2 Elements of the Architecture 3 2.1 Integrated Services Model : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 4 2.2 Reference Implementation Framework : : : : : : : : : : : : : : : : : : : : : : : : : : 6 3 Integrated Services Model 10 3.1 Quality of Service Requirements : : : : : : : : : : : : : : : : : : : : : : : : : : : : : R...