Local restoration for trees and arborescences

Protocols belonging to the Spanning Tree Protocol (STP) route traffic demands on tree topologies that are evaluated through shortest path procedures. In this paper we deal with the problem of assigning costs to the arcs of a network in order to guarantee that SPT protocols efficiently re-route traffic demands in failure situations: namely, without redirecting traffic demands that are not affected by the failure. We say that a communication network has the local tree-restoration property if there exists a set of costs for its arcs such that the above property holds. We show that an undirected network has the local tree-restoration property if and only if it is 2-connected. In particular, we provide a quite simple procedure for assigning costs to the arcs of a 2-connected network so that the property holds. For the directed case, we show that deciding whether a network has the local tree-restoration property is NP-hard, even in some “simple” cases.


Published in:
Traffic Management and Traffic Engineering for the Future Internet, 130-140
Presented at:
International Workshop on Traffic Management and Traffic Engineering for the Future Internet, Porto, Portugal, December 11-12, 2008
Year:
2009
Publisher:
Springer Berlin / Heidelberg
Laboratories:




 Record created 2010-04-13, last modified 2018-01-28


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