Dual-failure Survivability for Multi Quality Data using Single p-cycle

Dual-failure scenarios are a real possibility in today's optical networks and it is becoming more and more important foe carriers and network operators to consider them when designing their networks. p-Cycle is a recent approach in optical network protection. p-Cycle use pre- connected cycles of spare capacity to restore affected working traffic. We propose new method and strategies to support multiple qualities of service classes in a static p- cycle based network Design, using the same global set of resources as required to operate a network with only a single failure protected service class. A propose new method to provide dual failures survivability using p-cycle. A p-cycle is set up for each link. When link is failure, the system will on-line select the best route of p- cycle to react. In single failure or dual failure, data does not divert randomly in route of p-cycle. Data packets are switched based on priority criteria it means that the higher priority packets go through shortest distance route of p- cycle and lowest priority data packets go through longest distance route of p-cycle.