`Set to either Advertise or DoNotAdvertise. Routing
information is condensed at area boundaries. External to
the area, at most a single route is advertised for each
address range. The route is advertised if and only if the
addre range's Status is set to Advertise. Unadvertised
ranges allow the existence of certain networks to be
intentionally hidden from other areas. Status is set to
Advertise by default.'
REFERENCE
`OSPF NSSA Internet Draft, 3.2 type-7 address range'