OSPF areas

FIGURE 6 . 1
OSPF areas
Categories of Multi-Area Components
This section covers the various roles that routers play in a large OSPF network. These include
backbone routers, internal routers, area border routers, and autonomous system boundary
routers. We’ll also discuss the different types of advertisements that are used in an OSPF network
and the different types of areas that can be configured.
OSPF Router Roles
As we alluded to earlier, routers within a multi-area OSPF network fall into different categories.
To gain an understanding of the various roles that our routers can play, let’s consider Figure 6.2.
Single area OSPF network
Multi-area OSPF network
Area 0
Area 0
Area 10 Area 20