Types Of Ospf Routing Devices - Lenovo Flex System Fabric CN4093 Application Manual

Types of OSPF Routing Devices

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As shown in Figure 48, 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 48. OSPF Domain and an Autonomous System
BGP
External
ASBR
Routes
RIP
ASBR
OSPF Autonomous System
Backbone
Area 0
Inter-Area Routes
(Summary Routes)
ABR
Area 1
Area 3
ABR
ABR
Internal
Router
Area 2
Chapter 30: OSPF
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