Classification and comparison of schemes for providing scalable IP services over ATM networks

There are several approaches for the provision of scalable backbone IP over cell-based networks including multi-protocol label switching (MPLS) and multi-protocol over ATM (MPOA). This paper provides a classification that highlights the major differences between the various approaches. We classify approaches according to cut-through flow classification, path determination and forwarding granularity. This framework is used in conjunction with a comparative performance analysis to examine the strengths and weaknesses of popular approaches concentrating on MPLS and MPOA. We conclude that a new hybrid solution called destination-site label switching provides promising performance particularly in terms of flow classification and forwarding granularity.