-- The number and types of devices have increased dramatically.
-- Huge online customers amount making it difficult to develop new services in existing resources.
-- Existing network resources are complex, manual analysis takes a long time, and subject to errors.
-- New technologies, new equipment, and new services are constantly emerging, and need higher skills of maintenance.
SDN is an open, programmable network architecture with separated forwarding & control, and supports centralized management & control, open and programmable, on-demand and free migration of network functions, intelligent management of service life cycle and flexible system deployment. It is the mainstream trend for the future network.
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