Internet Quality of Service: An Overview

This paper presents an o v ervie w of Internet QoS, co v ering motiv ation and considerations for adding QoS to Internet, the definition of Internet QoS, traf fic and service specifications, IntServ and Dif fServ frame works, data path oper ations including packet classification, shaping and policing, basic router mechanisms for supporting QoS, including queue management and scheduling, control path mechanisms such as admission control, polic y control and bandwidth brokers, the merging of routing and QoS, traf fic engineering, constraint-based routing and multiprotocol label switching (MPLS), as well as end host support for QoS. W e identify some important design principles and open issues

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