Fichera, S.Martínez, R.Martini, BarbaraGharbaoui, M.Casellas, R.Vilalta, D.R.Muñoz, R.Castoldi, P.2019-05-282019-10-232019-04-23Fichera, S., Martínez, R., Martini, B., Gharbaoui, M., Casellas, R., Vilalta, R., Muñoz, R. y Castoldi, P. (2019). Latency-aware resource orchestration in SDNbased packet over optical flexi-grid transport networks. IEEE/OSA Journal of Optical Communications and Networking, 11 (4), pp. B83-B96.1943-0620https://hdl.handle.net/10016/28426In the upcoming 5G networks and following the emerging Software Defined Network/Network Function Virtualization (SDN/NFV) paradigm, demanded services will be composed of a number of virtual network functions that may be spread across the whole transport infrastructure and allocated in distributed Data Centers (DCs). These services will impose stringent requirements such as bandwidth and end-to-end latency that the transport network will need to fulfill. In this paper, we present an orchestration system devised to select and allocate virtual resources in distributed DCs connected through a multi-layer (Packet over flexi-grid optical) network. Three different on-line orchestration algorithms are conceived to accommodate the incoming requests by satisfying computing, bandwidth and end-to-end latency constraints, setting up multi-layer connections. We addressed end-to-end latency requirements by considering both network (due to propagation delay) and processing delay components. The proposed algorithms have been extensively evaluated and assessed (via a number of figures of merit) through experimental tests carried out in a Packet over Optical Flexi-Grid Network available in the ADRENALINE testbed with emulated DCs connected to it.15eng© 2019 IEEE.5GNFVOrchestrationSDNVirtual network functionVNF forwarding graphresearch articleTelecomunicacioneshttps://doi.org/10.1364/JOCN.11.000B83open accessB834B96IEEE/OSA Journal of Optical Communications and Networking11