Router>ena
Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#hostname SaiGon
SaiGon(config)#int s0
SaiGon(config-if)#ip address 10.0.0.1 255.255.255.252
SaiGon(config-if)#clock rate 64000
SaiGon(config-if)#no shut
%LINK-3-UPDOWN: Interface Serial0, changed state to up
%LINK-3-UPDOWN: Interface Serial0, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down
SaiGon(config-if)#exit
%LINK-3-UPDOWN: Interface Serial0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to up
SaiGon(config)#router ospf 12
SaiGon(config-router)#network 10.0.0.0 0.0.0.3 area 0
SaiGon(config-router)#exit
SaiGon(config)#^Z
%SYS-5-CONFIG_I: Configured from console by console

SaiGon#show ip ospf database 

       OSPF Router with ID (10.0.0.1) (Process ID 12)

         Router Link States (Area 0) 

Link ID         ADV Router      Age         Seq#       Checksum Link count
                     0   0x80000002    0x3419 
10.0.0.1                     0   0x80000002    0x7561 
11.0.0.1        11.0.0.1           0   0x80000001    0x4558