R1:
Interface Loopback0
IP Address 1.1.1.1 255.255.255.0
IP OSPF network point-to-point
!
Interface Tunnel0
IP address 13.1.1.1 255.255.255.0
Tunnel Source 1.1.1.1
Tunnel Destination 3.3.3.3
!
Interface serial0/0
IP address 192.168.12.1 255.255.255.0
Serial Restart-delay 0
!
Router OSPF 1
Log-adjacency-changes
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Network 0.0.0.0 255.255.255.255 Area 0
!
Router BGP 100
No synchronization
BGP log-neighbor-changes
Network 1.1.1.0 Mask 255.255.255.0
Neighbor 13.1.1.3 Remote-as 200
No auto-summary
R2:
Interface serial0/0
IP address 192.168.23.2 255.255.255.0
Serial Restart-delay 0
!
Interface SERIAL0/1
IP address 192.168.12.2 255.255.255.0
Serial Restart-delay 0
!
Router OSPF 1
Log-adjacency-changes
Network 0.0.0.0 255.255.255.255 Area 0
R3:
Interface Loopback0
IP address 3.3.3.3 255.255.255.0
IP OSPF network point-to-point
!
Interface Tunnel0
IP address 13.1.1.3 255.255.255.0
Tunnel Source 3.3.3.3
Tunnel Destination 1.1.1.1
!
Interface SERIAL0/1
IP address 192.168.23.3 255.255.255.0
Serial Restart-delay 0
!
Router OSPF 1
Log-adjacency-changes
Network 0.0.0.0 255.255.255.255 Area 0
!
Router BGP 200
No synchronization
BGP log-neighbor-changes
Network 3.3.3.0 Mask 255.255.255.0
Neighbor 13.1.1.1 Remote-as 100
No auto-summary