ONOS (Open Networking Operating System) is purpose-built for service providers who typically operate large and complex multi-layer networks. ONOS has native support for the most common type of multi-layer network, namely the packet/optical network. It does so by offering an innovative converged topology view, allowing rapid introduction of new services and unprecedented optimization in an environment which has been dominated by a legacy mindset
view the packet-optical wiki page
Service Provider Networks are complex and multi-layer in nature. Each of these layers, including packet and optical, is provisioned and managed independently. Often times, the provisioning of capacity or new services can take weeks if not months. A converged SDN control plane for packet and optical networks can help address these inefficiencies. Service providers can optimize across both the packet and optical layers in real-time for availability and economics, thereby reducing over-provisioning. Operators can add capacity based on traffic and other considerations in minutes instead of days or months.