OSPF 108
Figure 17 OSPF area types
Types of OSPF routing devices
As shown in the figure, OSPF uses the following types of routing devices:
• Internal Router (IR)—a router that has all of its interfaces within the same area. IRs maintain LSDBs identical to
those of other routing devices within the local area.
• Area Border Router (ABR)—a router that has interfaces in multiple areas. ABRs maintain one LSDB for each
connected area and disseminate routing information between areas.
• Autonomous System Boundary Router (ASBR)—a router that acts as a gateway between the OSPF domain and
non-OSPF domains, such as RIP, BGP, and static routes.
Figure 18 OSPF domain and an autonomous system
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