Main challenges on WAN due to NFV and SDN: multi-layer and multi-domain network virtualization and routing

This paper describes the requirements and challenges on WAN due to NFV in case of datacenter interconnections crossing heterogeneous domains for technology, control and vendors. It is presented a new architecture with novel functional building blocks between transport and service layers named E2E harmonization. Such architecture allows efficient virtualization for the service layer including novel elasticity parameters, while allow optimization for the transport resource. The solution allows evolving the transport network with new domains such as SDN, EON step by step that can be included as “plug-and-play” with easy interwork with existing transport domains. The solution is validated on a relevant network scenario provided from Telefonica showing the capability to following the dynamic traffic behavior without wasting bandwidth and guarantee 100% of traffic requests.