The link-state database for a given area is identical for all participating routers within that area.
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To ensure correct routing knowledge and connectivity, OSPF maintains a special area called the
backbone
area. OSPF designates the backbone area as Area 0.0.0.0. All other OSPF areas must connect themselves to
the backbone for connectivity. All data traffic between OSPF areas must transit the backbone.
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Slide 99
© 2011 Juniper Networks, Inc. All rights reserved.
| 99
CONFIDENTIAL
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Case Study: Objective and Topology
Use a single OSPF area to provide connectivity
among all connected subnets and loopback
addresses; ensure that no adjacencies are formed
on interfaces connecting to the 172.20.x.0/24
subnets
172.20.1.0/24
172.20.2.0/24
172.20.3.0/24
172.25.1.0/30
.1
.1
.1
.1
.2
.10
.9
.6
.5
ge-0/0/2
Host-A
lo0: 192.168.100.1/32
Host-B
lo0: 192.168.100.2/32
Host-C
lo0: 192.168.100.3/32
ge-0/0/1
ge-0/0/3
OSPF Area 0
Case Study: Objective and Topology
The slide provides the objective and sample topology used in this case study.
