BLADEOS 6.5.2 Application Guide

Types of OSPF Routing Devices

As shown in Figure 31, 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 31 OSPF Domain and an Autonomous System

 

 

OSPF Autonomous System

BGP

 

 

Backbone

Area 3

 

 

Area 0

 

 

 

 

External

 

 

Inter-Area Routes

ABR

ASBR

(Summary Routes)

Routes

 

 

 

 

 

RIP

 

 

ABR

 

 

 

ABR

 

 

 

 

 

 

ASBR

 

 

Internal

 

 

 

Router

Area 1

Area 2

 

BMD00220, October 2010

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Blade ICE G8124-E manual Types of Ospf Routing Devices, Ospf Domain and an Autonomous System

G8124-E, G8124 specifications

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