Abstract| There is considerable interest in the provision of guaranteed-rate services for IP and ATM networks. Simultaneously, bandwidth demands make input-bu ered architectures attractive, and in some cases, necessary. In this paper, we consider the problem of how to support guaranteed-rate services in a single-stage, input-bu ered switch suitable for a LAN switch, an ATM switch or an IP router. Such a switch m ust be feasible at high transmission speeds, o ering both guaranteed-rate

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... e for CBR channelse.g. for real-timeconnectionsand beste ort services for traditional data tra c. We consider a switch scheduling mechanism that employs idling hierarchical roundrobin HRR scheduling and fabric arbitration at the connectionlevel for guaranteed-rate service using the Slepian-Duguid algorithm. The switch uses cell level arbitrationfor best-e ortservice. This overall switch s c heduling mechanism is a variation of DEC's AN2 design 2 .