Use aggregate area ranges to reduce the number of link-state advertisements that are required within the area. You can also control advertisements.
area range {A.B.C.D} {A.B.C.D/X} { summary-link | nssa-extlink } advertise-metric <0-65535>
area range {A.B.C.D} {A.B.C.D/X} { summary-link | nssa-extlink } advertise-mode { summarize | suppress | no-summarize }
default area range {A.B.C.D} {A.B.C.D/X} { summary-link | nssa-extlink }
default area range {A.B.C.D} {A.B.C.D/X} { summary-link | nssa-extlink } advertise-metric
default area range {A.B.C.D} {A.B.C.D/X} { summary-link | nssa-extlink } advertise-mode
no area range {A.B.C.D} {A.B.C.D/X} { summary-link | nssa-extlink }
None
OSPF Router Configuration