Many companies and organizations use managed data center interconnect (DCI) services to connect their data centers. But as data volumes increase to hyperscale, managed DCI services become increasingly costly. They are also inflexible with poor response times to changing needs. The hyperscale enterprise needs to embrace webscale networks with consolidated, virtualized, data centers that reduce costs and improve efficiency. Webscale networks need DCI solutions that take full advantage of new agile, flexible and dynamic cloud IT models. Private DCI solutions based on dark fiber are a strategic investment to support private and hybrid clouds. This white paper examines the business case for building a webscale private DCI solution that provides scalability, control and security, with the cost offset significantly by savings achieved through consolidating multiple data centers and moving to more agile and flexible cloud IT models.