The development of both SDN and NFV promises to re-engineer the telecoms network for improved agility and service efficiency, and we are already seeing telcos view SDN as an enabler for NFV. But whilst a lot of the early work on SDN focused on OpenFlow as the southbound protocol, we are now seeing a variety of alternatives with many more under development, each with a differentiated use.
http://www.telecomtv.com/articles/sdn-and-openflow-apac/openflow-to-face-a-multi-protocol-market-for-the-sdn-southbound-link-12571/
