Avaya Configuring IP, ARP, RIP, and OSPF Services Manual de usuario Pagina 37

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IP Concepts, Terminology, and Features
117356-E Rev 00
1-15
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 1-5
shows an OSPF autonomous system divided into four areas and a
required central area called a backbone that is used to distribute routing
information among areas.
Figure 1-5. 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 EGP
BGP
R12
R13
R14
R15
RIP
R11
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