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current equipment. erefore, the main idea here is to analyze which
are the ideal barriers to the control plane to improve future specifica-
tions of OpenFlow or other SDNs.
Wireless and Optical SDN Models
Wireless and optical networks present particularities other than the
ones we address in ordinary wired networks. In this section, we dis-
cuss some of these particularities and discuss some proposals.
Optical SDN Models
One of the main problems when managing optical networks is that IP
and transport layers are independently operated. is increases costs
on both equipment and network operation and also increases net-
work complexity [15]. SDNs can circumvent this problem by uni