  In this paper, we consider both the Resilient Ring Star Problem, in which a
solution should be easy to fix when a single hub fails, and the Survivable Ring
Star Problem, in which a solution guarantees that a Ring Star topology is
available at no cost when a single hub fails. An ILP formulation is proposed
for both problems, as well as a Benders decomposition. The solution provided by
both problems are also compared in order to determine which problem returns the
most appropriate solutions, when the failure rate varies.
