RFC8950: Announce IPv4 with an IPv6 next-hop (opens in new tab)

For the last few days I have been playing with IPv4 an optional” feature riding on top of an IPv6 network (but without any tunnels!) Some of the interesting use cases: A large can run IPv6 only everywhere on its core and leave IPv4 only on edge devices. This can work without customers doing any tweaking at their end. They still do things the old way but Backbone can run IPv6 only at its core. An IP transit backbone can run IPv6 only while exchanging IPv4 routes with its customers/peers/upstre...