The "pure" SDN architectures from the beginning of the hype have been augmented by more applications, and (northbound) API centric approaches focusing on applications and integration. However, recently, underlying technologies, protocols and various overlay including very virtual switch centric solutions have shown up in the market.
Each and every architectural approach fits a specific market segment and set of requirements best, and so customers need to assess their necessities and find the right architectural fit in 2014.
Several of those new architectures are deployable today at scale, as they rely on existing protocols and also provide a smooth migration and integration into existing, heterogeneous network infrastructures. Without a doubt, we will see a larger adoption of SDN across the board including the enterprise.
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