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Orchestrating Multicast-Oriented NFV Trees in Inter-DC Elastic Optical Networks

Zeng, M. Z. ; Fang, W. F. ; Rodrigues, J. R. ; Zhu, Z. Z.

Orchestrating Multicast-Oriented NFV Trees in Inter-DC Elastic Optical Networks, Proc IEEE Communications Society IEEE International Conference on Communications ICC, Kuala Lumpur, Malaysia, Vol. Digital, pp. 1 - 6, May, 2016.

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Abstract
It is known that by incorporating network function virtualization (NFV) in inter-datacenter (inter-DC) networks, we can use the network resources more intelligently to deploy new services faster. This paper considers an inter-DC elastic optical network (IDC-EON) and studies how to orchestrate the multicast-oriented NFV trees (M-NFV-Ts) in it efficiently. We first consider an offline scenario in which all the M-NFV-Ts are known and need to be served in the network. A mixed integer linear programming (MILP) model is formulated to solve the problem exactly, and we also propose a heuristic based on path- intersection (PI) to reduce the time complexity. With extensive simulations, we show that the proposed heuristic can approximate the MILP’s performance on low-cost M-NFV-T provisioning but only requires much shorter running time. Next, the online scenario where the M-NFV-Ts can come and leave on-the-fly is addressed, and we leverage PI to design two online algorithms for orchestrating dynamic M-NFV-Ts in IDC-EONs, i.e., with either the batch (B-PI) or sequential (S-PI) scheme. Simulation results indicate that compared with S-PI, B-PI can reduce blocking probability effectively.