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Traffic demand uncertainty could affect the reliability of the logical connectivity in IP over WDM networks. In this paper, we investigate the effects of traffic uncertainty and load balancing in IP over WDM networks and propose new techniques for logical topology design. In particular, we model the logical topology design in IP over WDM networks as the integer linear programming problems. Our key contribution is that the proposed model can address three important issues including (a) ensuring connectivity of the IP layer (logical topology) (b) balancing traffic load in WDM networks and (c) ensuring network capacity to accommodate traffic demand under traffic uncertainty scenarios. We observe that the proposed logical topology design method with load balancing enables much higher traffic distribution across the physical links allowing up to 63 % decreasing in unbalancing index and up to 8 % increasing in the resource utilization needed to support IP traffic demand with traffic uncertainty considerations.
Date of Conference: 21-23 Nov. 2012