
Customizing OSPF Services
114065 Rev. A 5-5
OSPF Areas
OSPF routers reduce and restrict the amount of internal and external routing
information that is flooded through the AS by dividing the AS into areas.
Figure 5-1 shows an OSPF autonomous system divided into three areas and a
required central area called a backbone that is used to distribute routing
information among areas.
Figure 5-1. OSPF Areas
Backbone Area 0.0.0.0
R2
R2
R3
R4
R5
R6
R7
Stub Area 0.0.0.2
R8
R11
R12
R9
R13
R14
R10
RIP
Area 0.0.0.3
Area 0.0.0.1
IP0048A
BGP EGP
BGP
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