Proposal and Investigation of a Reconfiguration Cost Aware Policy for Resource Allocation in Multi-Provider NFV Infrastructures Interconnected by Elastic Optical Networks

Impact of the Maximum Number of Switching Reconfigurations on the Cost Saving in Network Function Virtualization Environments with Elastic Optical Interconnection

“…It may be characterized by: 1) the gain loss of a network operator due to the information loss during the VM migration and the circuit reconfiguration [20]; the energy consumption occurs when the VM memory content is moved from a server to another [11]. The problem has also been investigated in [16,21] in the case in which the datacenters are interconnected by an EON; the reconfiguration cost is characterized by the lost data during the reconfigurations of optical devices in the periods in which VM migrations are needed. Differently from electronic switches, the optical ones, though they have the potential to reduce the overall cost and the power consumption, allow for a lower reconfiguration rate dependently on the used technology.…”

“…We have formulated the ILP problem. It was inherited from the one proposed in [16] with the addition of a constraint on the maximum number R of switch reconfigurations. The output of the ILP provides for each SI: (i) in which NFVI-PoPs the VMs are allocated; (ii) the cloud resources, in terms of number of cores, allocated to each VM; (iii) the optical paths connecting each tuple of VMs, as well as the modulation system (BPSK, QPSK, 16QAM) used.…”

“…We provide an Integer Linear Programming (ILP) formulation of the cloud and bandwidth resource allocation problem in Appendix A. The problem is inherited from the one proposed in [16] with a more simple formulation and the addition of the constrain on the maximum number of switch reconfigurations.…”

“…We have provided an Integer Linear Programming (ILP) formulation of the optimization problem. It was inherited from the one proposed in [16] with the addition of a constraint on the maximum number of switch reconfigurations. Because of the computational complexity of the defined ILP, we propose a low computational complexity heuristic that allow us to study very complex network scenarios.…”

Adaptive Coherent Receiver Settings for Optimum Channel Spacing in Gridless Optical Networks

“…However, the impact of the neighboring channels in single-mode link, i.e., multi-channel propagation as in our work, on jitter was not discussed. In [13][14][15], authors discussed advantages of SDN and Network Function Virtualization (NFV) in reducing Capital Expenditures (CAPEX) and Operational Expenses (OPEX). In our work, we are interested in SDN as orchestration mechanism where the controller is aware of the conditions of the link, mainly the frequency of the channels in service.…”