Expanding software defined networking (SDN) to transport networks requires new strategies to deal with the large number of flows that future core networks will have to face. New south-bound protocols within SDN have been proposed to benefit from having control plane detached from the data plane offering a cost- and energy-efficient forwarding engine. This paper presents an overview of a new approach named KeyFlow to simultaneously reduce latency, jitter, and power consumption in core network nodes. Results on an emulation platform indicate that round trip time (RTT) can be reduced above 50% compared to the reference protocol OpenFlow, specially when flow tables are densely populated. Jitter reduction has been demonstrated experimentally on a NetFPGA-based platform, and 57.3% power consumption reduction has been achieved.
High degree of heterogeneity of future optical networks, such as services with different quality-of-transmission
requirements, modulation formats and switching techniques, will pose a challenge for the control and optimization of
different parameters. Incorporation of cognitive techniques can help to solve this issue by realizing a network that can
observe, act, learn and optimize its performance, taking into account end-to-end goals. In this letter we present the
approach of cognition applied to heterogeneous optical networks developed in the framework of the EU project CHRON:
Cognitive Heterogeneous Reconfigurable Optical Network. We focus on the approaches developed in the project for
optical performance monitoring and power consumption models to implement an energy efficient network.
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