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The digital transformation of enterprises has brought about the vigorous development of the cloud. Different industries have different requirements on data centers. The financial industry requires higher reliability. Data center construction is migrated from two-site three-center to multiple-center data centers. The OTT industry requires better experience. Data center construction is migrated from centralized DCs to distributed DCs.The development of enterprise data centers poses new requirements on WAN DCI networks. For example, the migration from geo-redundant data centers to multiple data centers requires large east-west traffic and network bandwidth upgrade. In addition, the production and office systems share the same DCI network, which requires higher network visualization. Distributed DC construction requires fast cross-DC service provisioning, fast cloud migration of branches, link utilization, and leased line costs.