Packet transport network for the edge (access) and metro segments
The packet transport network, located at the edge and metro segments, is mainly for traffic aggregation and switching of Ethernet flows with QoS, and relies on the optical transport network (i.e., using alien wavelength transport). This packet transport network allows Ethernet switching for flow aggregation and traffic grooming at 10/100/1000 Ethernet, enabling smaller flows (e.g., 10 GigE LAN traffic trunks) to be transported over the optical infrastructure and is based on cost-effective OpenFlow switches deployed on COTS and using Open vSwitch (OVS) technology. There are over ten OpenFlow switches. The same technology is used within data centers and in sites emulating e.g. Central Offices.
The edge packet transport network is composed of four edge nodes, providing connectivity to 5G base stations and IoT access gateways (e.g., offered by CTTC LENA emulator, and EXTREME testbed) and two OpenFlow switches located in the COs. The edge nodes are lightweight industrialized servers based on Intel Next Unit of Computing (NUC) since they have to fit in cell-site or street cabinets. Similarly, the metro packet transport network is also composed of 4 OpenFlow switches.
Depending on the use case or scenario, nodes of the edge packet transport network or nodes of the metro network can be connected to the optical core network by means of a 10 Gb/s XFP tunable transponder as alien wavelengths. Both the edge and metro segments are controlled with two OpenDayLight (ODL) SDN controllers using OpenFlow.