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Configuring OSPF
1-12 Command Line Interface Protocol Configuration Guide
In this example, area 0.0.0.2 is the stub area. No external routes from the external
autonomous system are forwarded into the stub.
!
Configuration on Router_2
Cajun (configure)#
router ospf
Cajun (configure router:ospf)#
network 192.168.20.0 0.0.0.255 area 0.0.0.0
Cajun (configure router:ospf)#
network 192.168.21.0 0.0.0.255 area 0.0.0.2
Cajun
(configure router:ospf)#
area 0.0.0.2 stub
!
!
Configuration on Router_3
Cajun (configure)#
router ospf
Cajun (configure router:ospf)#
network 192.168.21.0 0.0.0.255 area 0.0.0.2
Cajun
(configure router:ospf)#
area 0.0.0.2 stub
Cajun (configure router:ospf)#
exit
!
!
This saves the configuration.
Cajun (configure)#
copy running-config startup-config
In this example, the only routes that appears in Router_3’s routing table are intra-area
routes and the default route.
!
Configuration on Router_2
Cajun
(configure)#
router ospf
Cajun
(configure router:ospf)#
network 192.168.20.0 0.0.0.255 area 0.0.0.0
Cajun
(configure router:ospf)#
network 192.168.21.0 0.0.0.255 area 0.0.0.2
192.168.21.1
S0
192.168.21.2
S0
Stub Area 0.0.0.2
Area 0.0.0.0
Router_2
External AS
192.168.20.1
Router_3
E0
ospf3.vsd
192.168.21.1
S0
192.168.21.2
S0
Not-So-Stubby
Area 0.0.0.2
Area 0.0.0.0
Router_2
External AS
192.168.20.1
Router_3
E0
ospf4.vsd