DESIGN AND IMPLEMENTATION OF AN RSVP-BASED QUALITY OF SERVICE ARCHITECTURE FOR AN INTEGRATED SERVICES INTERNET

The Internet Engineering Task Force (IETF) is currently in the process of overhauling the architecture of the Internet to meet new challenge s and support new applications, One of the most important components o f that venture is the enhancement of the Internet service model from a classless best effort service architecture to an integrated services architecture supporting a multitude of classes and types of services, This paper presents the design, implementation, and experiences with a protocol architecture for the integrated services Internet, It is bas ed on the emerging standards for resource reservation in the Internet, namely, the RSVP protocol and the associated service specifications d efined by the IETF. Our architecture represents a major functional enh ancement to the traditional TCP/IP protocol stack, It is scalable in t erms of performance and number of network sessions, and supports a wid e variety of network interfaces ranging from legacy LAN interfaces, su ch as Token Ring and Ethernet, to high-speed ATM interfaces. The paper also describes the implementation of this architecture on the IBM AIX platform and our experiences with the system, We then present a perfo rmance analysis of the system which quantifies the overheads imposed b y all components of the QoS support, such as traffic policing, traffic shaping, and buffer management.