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Abstract. This paper presents Beacon, a technique that exploits the advantages of IP multicast to provide a low overhead system for network topology monitoring. Beacon is a self-organizing system which builds a self similar network topology that enables the system to converge very quickly even at a high degree of scalability. Another property of the Beacon system is that it does not require any interdomain routing protocol for IP multicast, making its deployment possible even in subnetworks which are interconnected by domains which do not support IP multicast routing or that deploy different routing protocols. One desirable side effect of the deployment of beacon is that it acts as a self configuring IP multicast tunneling facility which provides a distributed system with fault tolerant IP multicast reacheability. A comparison of Beacon with several other routing and gateway protocols is discussed.

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