One of the main strengths of OSPF is its capability to scale and to support large networks. It achieves this by creating areas from groups of subnets. The area is seen internally almost as if it is a small organization or entity on its own. It communicates with the other areas, exchanging routing information; this exchange is kept to a minimum, however, allowing only that which is required for connectivity. All computation is kept within the area.
In this way, a router is not overwhelmed by the entirety of the organization's network. This is crucial because the nature of a link-state routing protocol is more CPU- and memory-intensive.
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