A Taxonomy of Interaction Models for Internet and ATM Quality of Service Architectures
Key: SWKS99-1
Author: Jens Schmitt, Lars Wolf, Martin Karsten, Ralf Steinmetz
Date: January 1999
Kind: @article
Abstract: The ATM as well as the Internet community developed Quality of Service (QoS) architectures to provide integrated services. It can be assumed that both will play a certain role in the future and will coexist for quite some time. Presumably, ATM will be in the backbone, while IP will probably keep its dominance on the desktop. Hence, the use of an overlay model for the interaction between the two QoS architectures is very likely. A crucial component of such a model is the efficient mapping of RSVP (Resource reSerVation Protocol) as the Internet's signalling protocol onto the according ATM mechanisms. Unfortunately, due to the very different paradigms of the signalling protocols, this mapping is rather difficult. While other components of the QoS architectures like the QoS models, the management frameworks, the charging mechanisms, etc. also need to be dealt with for a complete solution to the problem of overlaying the Internet's QoS architecture onto that of ATM, we concentrate on the support for RSVP by an ATM subnetwork. In particular, this paper focuses on one of the most contrary characteristics of RSVP and ATM. This is the support for heterogeneous reservations by RSVP over the ATM subnetwork, taking into account that ATM only allows for a homogeneous QoS within a single Virtual Circuit (VC). We present previous approaches to the solution of this problem and argue for more sophisticated and efficient approaches to manage ATM VCs taking into consideration ATM tariffs and resource consumption. Furthermore, we discuss how RSVP should be extended to provide a framework to enable these more flexible VC management strategies for supporting heterogeneity over an ATM subnetwork. Keywords: IP/ATM Networks, RSVP, Multicast, Heterogeneous Reservations, VC Management, Resource Management, Cost Management.
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