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The operational model for large Internet service providers is moving to a multi-layer architecture consisting of IP/MPLS coupled with OTN/DWDM. While there has been significant work on multi-layer networks, the explicit modeling in IP/MPLS over OTN/DWDM has not been addressed before. This paper presents a detailed network optimization model for the operational planning of such an environment that considers OTN as a distinct layer with defined restrictions.
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