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IPv4 MPLS CE 6PE 6PE 6PE 6PE 2001:0421:: 2001:0420:: 145.95.0.0 2001:0621:: 2001:0620:: Dual Stack IPv4-IPv6 routers Dual Stack IPv4-IPv6 routers IPv6 Provider Edge Router (6PE): Solution - use existing protocol elements in a specific combination to achieve interoperability - use same architecture as 2547 and IPv6 VPN I-D o MP-BGP reachability information advertised Edge-to-Edge o IPv4 MPLS tunnelling through the core 6PE advertises IPv6 NLRI with IPv4 Next Hop encoded as an IPv4-mapped IPv6 address |