New Open-Source, SDN-Driven Leaf/Spine Fabric Debuts A handful of open-source consortia, led by ONOS and the Open Networking Foundation, have teamed up to develop and launch a leaf-spine data center fabric using all open-source software running on white-box switches. The system also uses an app running on the clusterable ONOS SDN controller. All of the software is available today for download. Bro