I asked Martin Casado to check whether I correctly described his HotSDN’12 paper in my Edge and Core OpenFlow post, and he replied with another interesting observation:
The (somewhat nuanced) issue I would raise is that [...] decoupling [also] allows evolving the edge and core separately. Today, changing the edge addressing scheme requires a wholesale upgrade to the core.
The 6PE architecture (IPv6 on the edge, MPLS in the core) is a perfect example of this concept.
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