Learn Cisco Packet Tracer
########## router 1
interface Loopback1
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet0/0
ip address 10.10.10.1 255.255.255.0
duplex full
!
router bgp 100
bgp router-id 10.10.10.1
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
network 10.10.10.0 mask 255.255.255.0
redistribute connected
neighbor 10.10.10.2 remote-as 123
!
########## router 2
interface Loopback1
ip address 2.2.2.2 255.255.255.255
!
interface FastEthernet0/0
ip address 10.10.10.2 255.255.255.0
duplex full
!
interface GigabitEthernet4/0
ip address 11.11.11.1 255.255.255.0
negotiation auto
!
interface GigabitEthernet5/0
ip address 33.33.33.1 255.255.255.0
negotiation auto
!
router ospf 10
network 2.2.2.2 0.0.0.0 area 0
network 11.11.11.0 0.0.0.255 area 0
network 33.33.33.0 0.0.0.255 area 0
!
router bgp 123
bgp router-id 10.10.10.2
bgp log-neighbor-changes
redistribute connected
redistribute ospf 10
neighbor 3.3.3.3 remote-as 123
neighbor 4.4.4.4 remote-as 123
neighbor 10.10.10.1 remote-as 100
!
########## router 3
interface GigabitEthernet4/0
ip address 11.11.11.2 255.255.255.0
negotiation auto
!
interface GigabitEthernet5/0
ip address 22.22.22.1 255.255.255.0
negotiation auto
!
router ospf 10
network 3.3.3.3 0.0.0.0 area 0
network 11.11.11.0 0.0.0.255 area 0
network 22.22.22.0 0.0.0.255 area 0
!
router bgp 123
bgp log-neighbor-changes
redistribute connected
redistribute ospf 10
neighbor 2.2.2.2 remote-as 123
neighbor 4.4.4.4 remote-as 123
!
############### router 4
interface GigabitEthernet4/0
ip address 22.22.22.2 255.255.255.0
negotiation auto
!
interface GigabitEthernet5/0
ip address 33.33.33.2 255.255.255.0
negotiation auto
!
router ospf 10
network 20.20.20.0 0.0.0.255 area 0
network 22.22.22.0 0.0.0.255 area 0
network 33.33.33.0 0.0.0.255 area 0
!
router bgp 123
bgp router-id 20.20.20.1
bgp log-neighbor-changes
redistribute connected
redistribute ospf 10
neighbor 2.2.2.2 remote-as 123
neighbor 3.3.3.3 remote-as 123
neighbor 20.20.20.2 remote-as 200
!
############## router 5
interface Loopback1
ip address 5.5.5.5 255.255.255.255
!
interface FastEthernet0/0
ip address 20.20.20.2 255.255.255.0
duplex full
!
router bgp 200
bgp router-id 20.20.20.2
bgp log-neighbor-changes
network 5.5.5.5 mask 255.255.255.255
network 20.20.20.0 mask 255.255.255.0
redistribute connected
neighbor 20.20.20.1 remote-as 123
!