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(R9) (Config)#
2. Enter Global Config mode and enable routing on the system.
(R9) #configure
(R9) (Config)#ip routing
3. Enter Interface Config mode for port 0/11. This interface is connected to R2, which is part of the same AS.
Assign an IP address to the interface, and enable routing on the interface.
(R9) (Config)#interface 0/11
(R9) (Interface 0/11)#ip address 172.18.1.26 255.255.255.252
(R9) (Interface 0/11)#routing
4. Configure the OSPF timers. The hello interval should be the same on all routers attached to a common
network. Likewise, the dead interval timers should be the same across all routers on the network.
(R9) (Interface 0/11)#ip ospf hello-interval 3 (R9) (Interface 0/11)#ip ospf dead-interval 12
5. Configure OSPF to treat the interface as a point-to-point link.
(R9) (Interface 0/11)#ip ospf network point-to-point
(R9) (Interface 0/11)#exit
6. Enter Interface Config mode for port 0/12. This is the interface that is connected to R3, which is in a
different AS. Assign an IP address to the interface, and enable routing on the interface.
(R9) (Interface 0/12)#interface 0/12
(R9) (Interface 0/12)#ip address 172.19.1.30 255.255.255.252 (R9) (Interface 0/12)#routing
(R9) (Interface 0/12)#exit
7. Enter Interface Config mode for port 0/20. This interface is connected to R7, which is part of the same AS.
Assign an IP address to the interface, and enable routing on the interface.
(R9) (Interface 0/20)#interface 0/20
(R9) (Interface 0/20)#ip address 172.18.1.13 255.255.255.252 (R9) (Interface 0/20)#routing
8. Configure the OSPF timers.
(R9) (Interface 0/20)#ip ospf hello-interval 3 (R9) (Interface 0/20)#ip ospf dead-interval 12
9. Configure OSPF to treat the interface as a point-to-point link.
(R9) (Interface 0/20)#ip ospf network point-to-point
(R9) (Interface 0/20)#exit
10. Enter Interface Config mode for loopback interface 0 and assign an IP address to the interface.
(R9) (Config)#interface loopback 0
(R9) (Interface loopback 0)#ip address 192.168.0.9 255.255.255.255
11. Configure the OSPF area ID that the loopback interface belongs to.
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