Avaya Configuring IP, ARP, RARP, RIP, and OSPF Services Manuel d'utilisateur Page 39

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IP Concepts, Terminology, and Features
308627-14.20 Rev 00
1-17
OSPF Areas
OSPF routers reduce and restrict the amount of internal and external link state
information that is flooded through the AS by dividing the AS into areas.
Figure 1-6
shows an OSPF autonomous system divided into four areas and a
required central area called a backbone that is used to distribute link state
information among areas.
Figure 1-6. OSPF Areas
Backbone
area 0.0.0.0
R2
R1
R3
R4
R5
R6
R7
Stub
area 0.0.0.2
NSSA
0.0.0.3
R8
R16
R17
R9
R18
R19
R10
RIP
Area 0.0.0.4
Area
0.0.0.1
IP0048A
BGP BGP
BGP
R12
R13
R14
R15
RIP
R11
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