Is SDN more than OpenFlow? What about overlay networking?

5 pts.
Tags:
application layer
application SDN
Layer 2
Layer 7
openflow
overlay SDN
SDN
Switches
As techniques like OpenFlow gain a foothold in the physical and virtual infrastructure layers and the multi-tenancy models mature, should OpenFlow conversations be taking place between the provider-controlled layer and the application-controlled layer? How do we - vendors, users, and industry pros - differentiate between SDN layer products? Is is OpenFlow vs. non-OpenFlow? Or layer2-3 products vs. application-layer? Or is it OpenFlow vs. overlay SDN?

Software/Hardware used:
SDN, software defined networking, virtual routers, virtual switches, OpenFlow, overlay networks

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