All routes in the Loc-RIB are processed into Adj-RIBs-Out according
to configured policy. This policy MAY exclude a route in the Loc-RIB
from being installed in a particular Adj-RIB-Out. A route SHALL NOT
be installed in the Adj-Rib-Out unless the destination, and NEXT_HOP
described by this route, may be forwarded appropriately by the
Routing Table. If a route in Loc-RIB is excluded from a particular
Adj-RIB-Out, the previously advertised route in that Adj-RIB-Out MUST
be withdrawn from service by means of an UPDATE message (see 9.2).