Abstract
Dense Wavelength Division Multiplexing (DWDM) has emerged as the premiere transport technology and has gained much traction in long-haul and metro/regional networks, while most of the Internet services have been converged on the Internet Protocol (IP) layer. This has motivated the expectation that IP over WDM multilayer infrastructure to be the preferred infrastructure for broadband communications in the near future. However routing and connection setup in multi-domain networks that considers both multilayer routing policies Physical Topology First (PTF) and Virtual Topology First (VTF) to handle circuit switched connection setup on both IP and optical WDM layers in multi-domain networks is not yet investigated sufficiently. In this paper we propose a routing scheme that can route a connection either on the optical or on the IP layer, which gives the opportunity to use the multilayer routing policies PTF and VTF in multi-domain network.
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