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Consider the first network area command. Area ID 10.9.50.0 is configured for the interface on which
subnet 131.108.20.0 is located. Assume that a match is determined for interface Ethernet 0. Interface
Ethernet 0 is attached to Area 10.9.50.0 only.
The second network area command is evaluated next. For Area 2, the same process is then applied to
all interfaces (except interface Ethernet 0). Assume that a match is determined for interface Ethernet 1.
OSPF is then enabled for that interface and Ethernet 1 is attached to Area 2.
This process of attaching interfaces to OSPF areas continues for all network area commands. Note
that the last network area command in this example is a special case. With this command, all available
interfaces (not explicitly attached to another area) are attached to Area 0.
6. Complex Internal Router, ABR, and ASBRs Example
The following example outlines a configuration for several routers within a single OSPF autonomous
system. Figuer 6-5 provides a general network map that illustrates this example configuration.
(1)
Configure router according to Figuer 6-5 above.
Router A:
interface loopback 0/0
ip address 202.96.207.81 255.255.255.0
!
interface Ethernet 1/0
ip address 192.168.10.81 255.255.255.0
!
interface ethernet 1/0
ip address 192.160.10.81 255.255.255.0
!
router ospf 192
network 192.168.10.0 255.255.255.0 area 1
network 192.160.10.0 255.255.255.0 area 0
!
Router B:
interface loopback 0/0
ip address 202.96.209.82 255.255.255.252
!
Model Name
Figuer 6-5 A general network map
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