OSPF Forward Address (FA): works like BGP next-hop for OSPF external routes advertised only if next-hop is on a not-passive and multiaccess interface if there's not a route to FA address, route is not installed FA = 0.0.0.0 --> cost to ABR FA <> 0.0.0.0 --> cost to FA address NSSA --> FA is ASBR IP --> remove FA with …