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Open Shortest Path First (OSPFv2 and OSPFv3) | 695
Figure 32-2. OSPF Routing Examples
Backbone Router (BR)
A Backbone Router (BR) is part of the OSPF Backbone, Area 0. This includes all Area Border Routers
(ABRs). It can also include any routers that connect only to the Backbone and another ABR, but are only
part of Area 0, such as Router I in Figure 32-2 above.
Router A
Router D
Router B
Router C
Router E
Router F
Router G
Router H
Router I
Router J
Router L
Router K
Router M
Area 100
Area 200
Area 300
Area 0
Stub Area
Area Border Router
Interior Router
Interior Router
Not So Stubby Area
Backbone Area
OSPF AS 9999
OSPF AS 8888
Router K
Router 8000
Autonomous System
Boundary Router
Router 81
Router 82
Autonomous System
Boundary Router
Backbone Router
Interior Router
Interior Router
Interior Router