Technical Report CS728

TR#:CS728
Title: A NEW PROTOCOL FOR ROUTE DISCOVERY IN MULTIPLE-RING NETWORKS: PART II -- MULTICAST, RECOVERY AND HIGH-SPEED PROCESSING.
Authors: R. Cohen and A. Segall
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Abstract:

A new MAC protocol for route discovery in multiple-ring network, called the ERD-Protocol, has been presented in Part I. The present paper introduces some extensions of this protocol. The first extension indicates how the ERD-Protocol can support multicast source routing, where a station seeks routes to multiple destinations. The ERD-Protocol supplies the source with a description of a collection of routes. The route collection forms a tree that spans the source and the destination group. This leads to an important advantage of source routing multicasting over transparent spanning tree multicasting, since multicast data-frames are sent on part of the network rather than on the entire network. Another addition presents a recovery mechanism from transmission errors and station failures. Finally, it is shown how the ERD-Protocol can be applied in networks with very high speed rings, where bridges do not have sufficient time, after recognizing the route identity, to look in the local table and decide whether the relevant fields in the received frame need to be altered.

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