Area ID – The IP address of the area.

Number of AS Border Routers – The total number of Autonomous System border routers reachable within this area. This number is initially zero and is calculated in each SPF pass.

Number of Internal LSAs – The number of internal link-state advertisements in the link-state database.

Internal LS Checksum Sum – The sum of LS checksums of internal LS advertisements contained in the LS database. Use this sum to determine if there has been a change in a router's LS database, and to compare the LS database of two routers.

Import AS Extern – Whether or not to import autonomous system external link advertisements.