Constraint-Based Hybrid Resiliency Mechanisms for Better Resource Utilization and Service Performance Quality in ASON SLA

This research work proposes new constraint-based hybrid resiliency mechanisms that are the combination of different disjoint flavors of 1+1 Dedicated Path Protection (DPP) and Restoration schemes. The proposed resiliency mechanisms are 1+1 Link-Disjoint DPP + Restoration, 1+1 Node-Disjoint DPP + Restoration and 1+1 SRG-Disjoint DPP + Restoration. Their performance is evaluated using Net2plan simulation tool. The results show that network availability and recoverability are improved when it is compared to non-combined counter parts. 1+1 Node-Disjoint + Restoration shows best recoverability at lower traffic loads during link or SRG failures. At higher traffic loads, 1+1 SRG-Disjoint + Restoration performs best in recoverability during SRG failures. For instance, 1+1 SRG-Disjoint + Restoration has on average 16.8% higher recoverability than 1+1 Link-Disjoint + Restoration at higher traffic loads. These performance enhancements are obtained with cost of relatively higher blocking probability.