Software-Defined Networks for Optical Networks Using Flexible Orchestration: Advances, Challenges, and Opportunities

Table 6

Pros and cons of standard virtualised architectures.

Pros	Cons
Deliver several dedicated virtual networks in place of infrastructures that are shared in networking domain	Issues with dedicated virtual networks that are not dependent on a single service provider
Each application can be tailored on demand for customers	Issues with traffic demand model and topologically data from physical networks hence less service provisioning
Compatible with current optical components such as wavelength selective switches and ROADMs	Difficulty in resource management and underutilisation
	Uses only two main dedicated controllers (father and local domain controller)
	General design challenges in a VON-based SDNs