Computing All the Best Swap Edges Distributively

Flocchini, Paola and Pagli, Linda and Prencipe, Giuseppe and Santoro, Nicola and Widmayer, P. and Zuva, T. (2004) Computing All the Best Swap Edges Distributively. Technical Report del Dipartimento di Informatica . Università di Pisa, Pisa, IT.

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Abstract

Recently great attention has been given to {\em point-of-failure swap rerouting}, an efficient technique for routing in presence of transient failures. According to this technique, a message follows the normal routing table information unless the next hop has failed; in this case, it is redirected towards a precomputed link, called {\em swap}; once this link has been crossed, normal routing is resumed. The amount of precomputed information required in addition to the routing table is rather small: a single link per each destination. Several efficient serial algorithms have been presented to compute this information; none of them can unfortunately be efficiently implemented in a distributed environment. In this paper we present protocols, based on a new strategy, that allow the efficient computation of all the optimal swap edges under several optimization criteria.

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