The Border Gateway Protocol over Multiprotocol Label Switching VPN feature is an implementation of the provider edge (PE)-based VPN model. In principle, there is no difference between IPv4 and IPv6 VPNs. In both IPv4 and IPv6, multiprotocol Border Gateway Protocol (BGP) is the center of the Multiprotocol Label Switching (MPLS) VPN for IPv6 (VPNv6) architecture. It is used to distribute IPv6 routes over the service provider backbone, using the same procedures to work with overlapping addresses, redistribution policies, and scalability issues.
Configuration information for IPv6 VPN over MPLS can be found in IPv6 VPN over MPLS section of MPLS: Layer 3 VPNs Configuration Guide.
Restrictions and limitations
Only one vrf is supported on an interface. It can be either ipv6 only or ipv4 only or both ipv4 and ipv6 family in one vrf.