http://ftpfaudev4triw2vxiwzf4334e3mynz7osqgtozhbc77fixncqzbyoyd.onion/ripe.net/rfc/rfc8994.html
This is because addressing used on links is IPv6 link-local addressing, which does not require any prior setup. In this way, the ACP can be built even if there is no configuration on the node, or if the data plane has issues such as addressing or routing problems. ¶ 6.