Configuring OSPF Areas

You can divide your OSPF routing domain into OSPF areas. Dividing into areas provides the following benefits:

You must attach each area in your routing domain to an area called the backbone area (0.0.0.0).

Disadvantages of using OSPF areas include the following:

You can optionally define an area to be a stub area, totally stubby area, or a not-so-stubby area. You can configure virtual links for areas that are not directly connected to a backbone area.

area default-cost

area nssa

area stub

area virtual-link

area virtual-link dead-interval

area virtual-link hello-interval

area virtual-link retransmit-interval

area virtual-link transmit-delay

automatic-virtual-link

no area