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Optical network technology is one of the leading candidates for meeting the required backhaul transport layer latency and capacity requirements of 5G services. In addition, its physical layer programmability supports the execution of advanced methods that can improve 5G service reliability and SLA compliance in the face of equipment failure. While a number of such methods is addressed in the literature, including Virtual Network Function (VNF) fault-tolerant methods, a full proof of concept is yet to be reported.The study in this paper describes a testbed - along with its Software Defined Networking (SDN) and Network Function Virtualization (NFV) capabilities - which is used to experimentally showcase the key functionalities that are required by VNF fault-tolerant methods. The testbed makes use of OpenROADM compliant Dense Wavelength Division Multiplexing (DWDM) equipment to implement the programmable …