Value optimization of survivable multilayer IP/MPLS-over-WSON networks |
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Authors: | Luis Velasco O González de Dios S Ricciardi A Castro F Muñoz D Careglio J Comellas |
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Affiliation: | 1.Universitat Politècnica de Catalunya (UPC),Barcelona,Spain;2.Telefónica Investigación y Desarrollo (TID),Madrid,Spain |
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Abstract: | Network operators are willing to provide a range of services in the hope of maximizing their profits: from the highly available
connectivity services for key business customers to the unprotected or even best effort services for residential customers.
These services are being provided through IP/multiprotocol label switching (MPLS) over wavelength-switched optical networks
(WSON) networks. Such multilayer network enables the application of optimal load balancing between the packet and the optical
layer, optimizing both the cost of the packet layer and the utilization of the WSON. To provide highly available services,
redundant network resources need to be added to the network providing survivability against failures; generally speaking,
the higher the survivability degree, the higher both the capital and the operational expenditures (CAPEX and OPEX, respectively)
of the network. In this work, we design networks to meet specific availability objectives considering single failures in optical
links, IP/MPLS nodes, and optoelectronic ports. The benefits of the designed networks are evaluated from an economic perspective
defining costs and revenues models and using Net Present Value as a metric to evaluate future cash flows after an investment.
To this end, CAPEX and OPEX, including power consumption and maintenance, and penalties as a consequence of service level
agreement breaches are considered. Exhaustive numerical results on several reference network scenarios demonstrate how the
value of the network can be maximized by tuning availability objectives. |
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