Types Of Ospf Routing Devices; Figure 4-2 Ospf Domain And An Autonomous System - Nortel Web OS Switch Software Application Manual

Types of OSPF Routing Devices

As shown in
n
Internal Router (IR)—a router that has all of its interfaces within the same area. IRs main-
tain LSDBs identical to those of other routing devices within the local area.
n
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.
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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.
BGP
External
Routes
RIP

Figure 4-2 OSPF Domain and an Autonomous System

212777-A, February 2002
Figure 4-2, OSPF uses the following types of routing devices:
OSPF Autonomous System
ASBR
ABR
ASBR
Area 1
Backbone
Area 0
Inter-Area Routes
(Summary Routes)
ABR
Area 2
Web OS 10.0 Application Guide
Area 3
ABR
Internal
Router
Chapter 4: OSPF
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