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The service model proposed by the IETF for integrated services in IP internets, including the Internet, specifies, amongst others, a guaranteed delay service, which offers a deterministic delay for packet delivery. An analysis is presented of implementation aspects of this service, when ATM subnets are used. An evaluation is made of the reserved bandwidth necessary to guarantee a given maximum delay for a given application, taking into consideration alternative strategies for implementing IP over ATM, and factors such as traffic profile, end-to-end hop count, packet transmission with or without fragmentation, and bandwidth reservation for individual flows or groups of flows. It is shown that the reserved bandwidth necessary to guarantee a given delay is reduced by interleaving cells from different packets, by making flow group reservations, and by reducing the number of intermediate nodes. In large-scale internetworks implemented over (similarly large-scale) ATM subnets, switched virtual channels (VCs) have to be used. In such a situation, in order to perform flow group reservations and to fragment packets, it has to be possible to interleave cells from different packets in the same virtual channel. VC management is also discussed, and the need is shown for procedures to optimise bandwidth and simplify the inclusion of flows in a group. A multilink procedure is proposed, which allows gradual alterations to be made to the bandwidth allocated to a flowgroup, thus permitting the inclusion and exclusion of individual flows in groups. An outline proposal is also presented of a SIA (Server for IP/ATM Integration), an ATM network device for setting-up and release of switched VCs used for traffic aggregation for support of IP flows.

Optimising bandwidth reservation in IP/ATM internetworks using the guaranteed delay service