IPv6 MPLS L3VPN routing information advertisement
The routing information for a local CE is advertised to the remote CE by using the following process:
From the local CE to the ingress PE.
The local CE advertises standard IPv6 routing information to the ingress PE over an IPv6 static route, RIPng route, OSPFv3 route, IPv6 IS-IS route, IBGP route, or EBGP route.
From the ingress PE to the egress PE.
After receiving the standard IPv6 routes from the CE, the ingress PE adds RDs and route targets to create VPN-IPv6 routes, saves the routes to the routing table of the VPN instance created for the CE, and then notifies MPLS to assign VPN labels for the routes.
Then, the ingress PE advertises the VPN-IPv6 routes to the egress PE through MP-BGP.
The egress PE compares the export target attributes of the VPN-IPv6 routes with the import target attributes that it maintains for the VPN instance and, if they are the same, adds the routes to the routing table of the VPN instance.
The PEs use an IGP to ensure the connectivity between them.
From the egress PE to the remote peer CE.
The egress PE restores the original IPv6 routes and advertises them to the remote CE over an IPv6 static route, RIPng route, OSPFv3 route, IPv6 IS-IS route, EBGP, or IBGP route.