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Current survivability schemes typically offer two degrees of protection, namely full protection (from a single failure) or no protection at all. Full protection translates into rigid design constraints, i.e. the employment of disjoint paths. We introduce the concept of tunable survivability that bridges the gap between full and no protection. First, we establish several fundamental properties of connections with tunable survivability. With that at hand, we devise efficient polynomial (optimal)doi:10.1109/icnp.2004.1348072 dblp:conf/icnp/BannerO04 fatcat:ipdter7hcvflzl5ivwe4wfm3gm