Journal ArticleDOI
OpenFlow-assisted online defragmentation in single-/multi-domain software-defined elastic optical networks [invited]
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TLDR
An inter-domain protocol to facilitate FA-RSA in multi-domain SD-EONs with the cooperation of multiple OpenFlow controllers is designed and implemented and the experimental results indicate that the OpenFlow-controlled DF systems perform well and can improve the performance of SD- EONs effectively.Abstract:
Spectrum fragmentation limits the efficiency of spectrum utilization in elastic optical networks (EONs). This paper studies how to take advantage of the centralized network control and management provided by software-defined EONs (SD-EONs) for realizing OpenFlow-assisted implementation of online defragmentation (DF). We first discuss the overall system design and OpenFlow protocol extensions to support efficient online DF and conduct DF experiments with routing and spectrum assignment (RSA) reconfigurations in a single-domain SD-EON. Then, we propose to realize fragmentation-aware RSA (FA-RSA) in multi-domain SD-EONs with the cooperation of multiple OpenFlow controllers. In order to provision inter-domain lightpaths with restricted domain visibility on intradomain resource utilization, we design and implement an inter-domain protocol to facilitate FA-RSA in multi-domain SD-EONs and demonstrate controlling the spectrum fragmentation on inter-domain links with FA-RSA. Our experimental results indicate that the OpenFlow-controlled DF systems perform well and can improve the performance of SD-EONs effectively.read more
Citations
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Journal ArticleDOI
Software Defined Optical Networks (SDONs): A Comprehensive Survey
TL;DR: This article comprehensively survey studies that examine the SDN paradigm in optical networks; in brief, it mainly organize the SDON studies into studies focused on the infrastructure layer, the control layer, and the application layer.
Journal ArticleDOI
Fragmentation Problems and Management Approaches in Elastic Optical Networks: A Survey
TL;DR: This survey paper starts with the basic concept of EONs and their unique properties, and then moves to the fragmentation problem in Eons, and evaluates and analyzes the major fragmentation management approaches in terms of blocking probability.
Journal ArticleDOI
Joint Spectrum and IT Resource Allocation for Efficient VNF Service Chaining in Inter-Datacenter Elastic Optical Networks
TL;DR: The simulation results indicate that the proposed algorithms can reuse the deployed VNFs efficiently and arrange the spectrum utilization in a much more load-balanced manner.
Journal ArticleDOI
Orchestrating Tree-Type VNF Forwarding Graphs in Inter-DC Elastic Optical Networks
TL;DR: This study studies the provisioning algorithms to realize tree-type virtual network function forwarding graphs (VNF-FGs), i.e., multicast NFV trees (M-NFV-Ts), in inter-DC elastic optical networks (IDC-EONs) cost-effectively and designs two additional online algorithms based on AFM-GS and RB to serve M-NFv-Ts in a dynamic IDC- EON, with the consideration of spectrum fragmentation.
Journal ArticleDOI
Cost-Efficient Virtual Network Function Graph (vNFG) Provisioning in Multidomain Elastic Optical Networks
TL;DR: This paper investigates how to cost-effectively provision vNF graphs with arbitrary topologies in a multidomain elastic optical network that consists of two domains, i.e., the private and public ones.
References
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Journal ArticleDOI
Elastic optical networking: a new dawn for the optical layer?
TL;DR: The drivers, building blocks, architecture, and enabling technologies for a whole new elastic optical networking paradigm are described, as well as early standardization efforts.
Journal ArticleDOI
Spectral and spatial 2D fragmentation-aware routing and spectrum assignment algorithms in elastic optical networks [invited]
TL;DR: Simulation results indicate that the proposed fragmentation-aware (FA) RSA algorithm and the FA algorithm with congestion avoidance (CA) outperform the existing schemes in terms of blocking probability (BP) reduction.
Journal ArticleDOI
Software-defined optical networks technology and infrastructure: Enabling software-defined optical network operations [invited]
TL;DR: A unified control plane architecture based on OpenFlow for optical SDN tailored to cloud services is introduced and implementations are proposed and demonstrated across heterogeneous state-of-the-art optical, packet, and IT resource integrated cloud infrastructure.
Journal ArticleDOI
Extending software defined network principles to include optical transport
TL;DR: The benefits and challenges of extending SDN concepts to various transport network architectures that include optical wavelength and fiber switches, circuit switches, and sub-wavelength optical burst switches are reviewed.
Proceedings ArticleDOI
Disruption minimized spectrum defragmentation in elastic optical path networks that adopt distance adaptive modulation
TL;DR: Disruption-minimized spectrum defragmentation in dynamic elastic optical path networks that adopt distance adaptive modulation is evaluated and the number of accommodated paths is improved by 10% by the introduction of make-before-break rerouting.