FRADIR Meets Availability
The framework FRADIR is designed to improve disaster resilience for mission-critical applications through reliable network design, regional failure modeling and protection routing. Two different failure models are jointly considered: independent random failures and regional failures, which are used to model the effects of disasters. In this paper we provide the first availability analysis of FRADIR. We examine the effect of the Spine and protection routing on end-to-end availability. In particular the 1+1 and four versions of General Dedicated Protection (GDP) are utilized to demonstrate the bandwidth allocation, blocking probability and availability trade-off. After the comprehensive availability analysis, to take control over this trade-off we introduce a novel routing method for FRADIR, called Availability Constraint FRADIR (AC-FRADIR) which not only minimizes the bandwidth cost and ensures protection against certain failure events (listed in the SRLG list), but also guarantees that after any of these failure events the remaining communication path still satisfies a certain availability level.