Frame Relay was to teach multipoint networking to upcoming engineers and we recently abandoned on the curriculum. Now it’s back in MPLS-TP.
Where do you want Ethernet ? Everywhere apparently.
I’m at a conference about “Cloud Ethernet Forum” and subsidiary operation of the Metro Ethernet Forum that seems to want to invent a new Ethernet. The fundamental premise of the is that customers need/want/demand/must have more Ethernet in the WAN.
Why ? Because Ethernet is better for data centre managers.