Telefonica I D 1 article published in JoVE Engineering Integration of 5G Experimentation Infrastructures into a Multi-Site NFV Ecosystem Borja Nogales*1, Luis F. Gonzalez*1, Ivan Vidal*1, Francisco Valera*1, Jaime Garcia-Reinoso*1, Diego R. Lopez*2, Juan Rodríguez*2, Neftali Gonzalez*3, Ignacio Berberana*3, Arturo Azcorra*1,3 1Department of Telematic Engineering, Universidad Carlos III de Madrid, 2Telefónica I+D, 3IMDEA Networks Institute The objective of the described protocol is to support the flexible incorporation of 5G experimentation infrastructures into a multi-site NFV ecosystem, through a VPN-based overlay network architecture. Moreover, the protocol defines how to validate the effectiveness of the integration, including a multi-site vertical service deployment with NFV-capable small aerial vehicles.