Using OSPF as a PE-CE protocol

OSPF LSA are not transported over the ip-vpn backbone.

The LSA are imported into ospf as AS externals the PE router acts as an ASBR in this case.The OSPF cost is transported as BGP MED attribute. OSPF routes are automatically imported into the MPBGP however a policy is required in the opposite direction ie from the MPBGP to ospf.