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A multilayer network topology architecture of IP/MPLS over OTN (Optical Transport Networks) over DWDM has been receiving significant attention in large ISP's networks. In this multilayer network architecture, we consider the problem of optimizing the node capacity of nodes in different layers. This goal is of importance in a large ISP network to reduce the amount of power consumption of complex structural nodes, or to balance between node costs in different layers. We present an optimization model that considers each layer's constraints including the OTN layer, aiming to reduce the capacity of the routing and switching nodes. We then present an analysis on how node capacity is impacted at each layer.