Survivable overlay multicasting in WDM optical networks with dual homing architecture

In this paper, we focus on the topic of dynamic routing of multicast sessions in WDM networks. We consider a multilayer optimization problem that combines two approaches - optimization of an overlay (application) multicasting and next provisioning of created overlay multicasting tree as a set of unicast demands in the underlying WDM network. Moreover, we address our problem with the survivability assumptions and propose several scenarios that can be applied in the network (in both application and optical layers) to provide the required protection. We perform numerical experiments to compare different protection scenarios and routing algorithms for both overlay and optical layers. The obtained results show that proper selection of a routing algorithm has a significant impact on the network performance in terms of the blocking probability. Furthermore, our studies indicate that the additional survivability requirements also strongly influence the blocking probability. Finally, we show that overlay multicasting brings significant resources savings than when using unicast transmission in the overlay layer.