IPv4/IPv6 over IPv6 IP-in-IP encapsulation

This feature enables IPv4 and IPv6 payload traffic to be encapsulated inside IPv6 packets for transport across an IPv6 network. You can use IP-in-IP encapsulation to build scalable IP overlays while logically separating edge traffic from the underlying core transport network. The tunnel destination can be resolved over IP, LDP, RSVP-TE, or LDP over RSVP-TE, depending on the deployment.