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Areas

An area is a set of networks and hosts within an AS that have been administratively grouped together. We recommend that you configure an area as a collection of contiguous IP subnetted networks. Routers that are wholly within an area are called internal routers. All interfaces on internal routers are directly connected to networks within the area.

The topology of an area is hidden from the rest of the AS, thus significantly reducing routing traffic in the AS. Also, routing within the area is determined only by the area’s topology, providing the area with some protection from bad routing data.

All routers within an area have identical topological databases.

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