ABSTRACT
This chapter considers the problem of real-time provisioning of optical channels in hybrid Internet provider (IP)-centric dense wavelength division multiplexing (DWDM)-based networks. First, an overview of the emerging architectural alternatives for IP over optical networks is presented; namely the overlay, the peer, and the augmented models. Subsequently, lightpath provisioning issues are detailed for route selection, with a particular focus on the routing and wavelength assignment (RWA) problem. In particular, a broad overview is presented, with methodologies and associated algorithms for dynamic lightpath computation being outlined. Additionally, two broad constraint-based RWA algorithms for dynamic provisioning of the optical channels are presented. Finally, the implications of implementing the proposed RWA schemes for the lightpath provisioning aspects for each of the three emerging IP-over-optical network interconnection models are examined.
