Efficient cluster based protection strategy to improve survivability in optical networks

Efficient routing with 100% survivability level is one of the challenging task for wavelength division multiplexing (WDM) optical networks. In this paper, we have proposed an efficient cluster based protection (CBP) strategy to improve the survivability in WDM optical networks. CBP strategy provides protection against a single link failure. In CBP, the connection requests are classified into different clusters. The requests having link-disjoint primary paths are considered in the same cluster. Each cluster is processed one by one as per the decreasing order of cluster size or the number of requests in a cluster. Simulation results of the proposed CBP strategy shows improved performance on the evaluating parameter of blocking probability (BP), resource overbuild (RO) and link load (LL) in comparison to the traditional shared path protection (SPP) strategy. CBP strategy shows 16.51 % and 12.57 % reduction in BP and RO, respectively. Also, the CBP distributes traffic load uniformly along each link of the network which is demonstrated by LL metric.