For those who have not been tracking this work, Internet2 has completed one of the smoothest and most amazing technology transitions I've ever seen (despite a few unexpected obstacles like a pandemic); the new network is absolutely amazing. This is a very brief, high-level summary of what's been happening and I'd urge member of the CNI community who have not been following developments in this area to spend a few minutes reading this.

Internet2 Next Generation Infrastructure Operational, Transition to Fully-Automated, 400G National Infrastructure Complete - Internet2

Internet2 today announced the completed transition of its research and education (R&E) network traffic to the fifth-generation backbone.

Clifford Lynch Director, CNI