Types Of Ospf Routing Devices; Figure 12-2:Ospf Domain And An Autonomous System - Nortel Alteon OS 42C4911 Application Manual

Alteon OS Application Guide

Types of OSPF Routing Devices

As shown in
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.
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.
BGP
External
Routes
RIP
Figure 12-2 OSPF Domain and an Autonomous System
190 Chapter 12: OSPF
Figure 12-2, 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
Area 3
ABR
Internal
Router
42C4911, January 2007