SRv6 BGP based Overlay services

This draft defines procedures and messages for SRv6-based BGP services including L3VPN, EVPN and Internet services. It builds on RFC4364 "BGP/MPLS IP Virtual Private Networks (VPNs)" and RFC7432 "BGP MPLS- Based Ethernet VPN" and provides a migration path from MPLS-based VPNs to SRv6 based VPNs.