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Operational networks get gradually upgraded to avoid capacity exhaustion and create resources to handle traffic growth. These upgrades require installation of new physical resources (e.g., line cards) and might be costly to network operators. The additional Capital Expenditure (CapEx) to upgrade the network can be reduced or eliminated by relocating excess resources which were deployed into the network, but are unused (e.g., due to optimistic forecasts or excessive over-provisioning). The authors investigate a cost-effective scheme to relocate excess capacity in an optical WDM backbone network to reduce or eliminate upgrade costs, avoid capacity exhaustion (by migrating resources from underutilized links to over-utilized links), and improve network robustness (by migrating resources from unreliable links to reliable links).
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