• Australia - AARNet (https://aarnet.edu.au/)
• Brazil - ANSP and RNP through AmLight (http://amlight.net/)
• Caribbean - CKLN through AmLight (http://amlight.net/)
• Chile -  Reuna through AmLight (http://amlight.net/)
• Europe through GEANT PAN European Network GTS testbed facility http://geant.net)
  • Italy - CREATE-NET and Università Roma Tor Vergata through Consortium GARR (http://garr.it)
• Korea - KREONET (http://www.gloriad.org/gloriaddrupal/?q=node/114)
• Taiwan - National Chiao Tung University (http://nctu.edu.tw)
• United States  - Clemson University, Duke University, Florida International University, Georgia Tech, Indiana GigaPoP, University of Huston, University of Maryland, University of Oklahoma at Norman, University of Utah - through Internet2 (http://internet2.edu)

Architectural principles

Each REN acts as a separate Autonomous System, administratively isolated from others. This gives to Operators the possibility to be enough independent, experimenting within their domain specific features while enforcing their own settings and polices.

The networks are composed by different (usually OpenFlow) devices, connected to one or more ONOS clusters, made of one or more instances. Operators enforce network polices from the logically centralized ONOS controller and install different applications on top of it, depending on the needs (i.e. provide L2 or L3 connectivity to end-users).

Depending on the infrastructure offered/run by each REN, the SDN devices may be:

• Running as the production network
• The same of the production network, but ONOS is running in a L2 slice given by the OF (or legacy) network hypervisor offered by the REN itself
• Deployed in parallel to the production network as a completely separate Future Internet research infrastructure
  
  
• Connected directly with dedicated fibers
• Connected on top of/through an underlying legacy production L2 network

The same usually happens for the L2 connections from the PoP to the end-users.

The RENs are connected through dedicated Layer 2 circuits, terminated on each end at the OpenFlow switches