Proposal for tutorial at DRCN´2009

The establishment of converged telecommunication networks, that simultaneously accommodate a growing variety of services through a common supporting network infrastructure, is a general trend, aimed at significantly reducing network expenditures. This trend has encouraged the development of a unified network paradigm capable of supplying a wide variety of cost-effective recovery solutions, each of which may cope differently with fiber cuts and equipment failures at the network nodes in order to satisfy service-dependent requirements. Expansion of the Origin-Destination (OD) Cycles approach to encompass high-order values applied to failure-independent and dependent path-recovery cases is used to meet that challenge by offering a sample of ten different policies for survivability and their relative performance measures in terms of consumption of network resources and the resulting times of recovery. For practical purposes the scope of failure scenarios is limited to single and double point of network failures only, even though the approach suggested is generic and can basically address even more complex events. Several test networks are extensively analyzed to demonstrate results of the paradigm developed and to present some useful observations about the relative positioning of the policies considered for survivability.