Diverse Routing in Networks with Star SRLGs

International audienceThe notion of Shared Risk Link Group, SRLG has been intro- duced to capture multiple correlated failures in a network. A SRLG is a set of links that fail simultaneously if a given event (risk) occurs. In such multiple failures scenario, the problem of Diverse Routing consists in finding two SRLG- disjoint paths between a pair of nodes. We consider such problem for localized failures, when all the links of a SRLG verify the star property i.e. when they are incident to the same node. We prove that in this case the problem is in gen- eral NP-complete and determine some polynomial cases