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In this paper, we present, QoSMIC, a multicast protocol for the Internet that supports QoS-sensitive routing, and minimizes the importance of <i>a priori configuration</i> decisions (such as <i>core</i> selection). The protocol is resource-efficient, robust, flexible, and scalable. In addition, our protocol is provably loop-free.Our protocol starts with a(More)
On-line multicasting has received a lot of attention lately, because of its great practical importance. However, most research assumes undirected graphs, which fail to model the directivity of real networks. In this paper, we ll this gap by ooering upper and lower bounds for the on-line directed multicast problem in a worst case analysis. We examine two(More)
We propose Delegated Tuning and Forwarding (DTF), a new architecture for dynamically assigning wavelength channels in a \broadcast star" optical network. DTF exploits tunable components without making excessive demands on tuner agility by combining the tuning on demand of receivers with the forwarding of packets over a logical topology. We describe the(More)
The increasing demand for point-to-multipoint connections has established multicast routing as a crucial aspect of network management. Hierarchical encoding is a newly proposed technique that ooers a variety of quality levels in one encoding; a user or a switch can lter the data that will be processed further. In this paper, we examine how hierarchical(More)
In this paper we study the problem of on-line multicasting on directed graphs, and we demonstrate the competitiveness of a greedy algorithm in a worst case analysis. We prove that the greedy algorithm performs almost as well as any on-line algorithm: the greedy upper bound is very close to the lower bound of any on-line algorithm. First, we improve on the(More)
We propose Delegated Tuning and Forwarding With In-band Signaling (DTFIS), an architecture for assigning channels in a broadcast optical network. This is a multihop architecture in which the multihop topology adapts itself to the traac in the network. The architecture has very modest requirements on tunability of receivers. We sketch the basic features of(More)
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