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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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MPLS VPN Network Using IPv6 over IPv4 Tunnels on the CE Routers

MPLS VPN for IPv4 has seen a great success. Many service providers run it in their network. If you want to carry IPv6 over the MPLS VPN backbone, the CE routers are running IPv6 already. If the CE routers run dual-stack—meaning they also run IPv4 next to IPv6—you can implement tunnels between the CE routes to carry the IPv6 traffic. As such, the possibility of carrying IPv6 over the MPLS VPN network might seem an interesting one, because no changes need to be made on the MPLS network. The PE and P routers do not need to run IPv6 at all. The disadvantage is that the tunnels on the CE routers do not bring to IPv6 the advantage of the peer model that the MPLS VPN model has. As such, ...

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