<--R1-->
!
hostname ENTERPRISE_FOS
!
ip cef
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/0
 ip address 192.168.1.2 255.255.255.252
 clock rate 2000000
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/1
 no ip address
 shutdown
 clock rate 2000000
!
router eigrp 65001
 network 3.3.3.3 0.0.0.0
 network 192.168.1.2 0.0.0.0
 auto-summary
!
router bgp 65001
 no synchronization
 bgp log-neighbor-changes
 neighbor 1.1.1.1 remote-as 65001
 neighbor 1.1.1.1 update-source Loopback0
 no auto-summary

<--R2-->
!
hostname EDGE-ROUTER
!
ip cef
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface Loopback1
 ip address 192.168.100.1 255.255.255.0
!
interface Loopback2
 ip address 192.168.200.1 255.255.255.0
!
interface Loopback3
 ip address 192.168.150.1 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/0
 ip address 192.168.1.1 255.255.255.252
 clock rate 2000000
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/1
 ip address 20.0.0.1 255.255.255.252
 clock rate 2000000
!
router eigrp 65001
 network 1.1.1.1 0.0.0.0
 network 192.168.1.1 0.0.0.0
 network 192.168.100.1 0.0.0.0
 network 192.168.150.1 0.0.0.0
 network 192.168.200.1 0.0.0.0
 auto-summary
!
router bgp 65001
 no synchronization
 bgp log-neighbor-changes
 neighbor 2.2.2.2 remote-as 65000
 neighbor 2.2.2.2 ebgp-multihop 255
 neighbor 2.2.2.2 update-source Loopback0
 neighbor 3.3.3.3 remote-as 65001
 neighbor 3.3.3.3 update-source Loopback0
 neighbor 3.3.3.3 next-hop-self
 no auto-summary
!
ip forward-protocol nd
ip route 2.2.2.2 255.255.255.255 Serial0/1
!

<--R3-->
!
hostname ISP
!
ip cef
!
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
!
interface Loopback1
 ip address 30.0.0.1 255.255.255.0
!
interface Loopback2
 ip address 40.0.0.1 255.255.255.0
!
interface Loopback3
 ip address 50.0.0.1 255.255.255.0
!
interface Loopback4
 ip address 60.0.0.1 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/0
 ip address 20.0.0.2 255.255.255.252
 clock rate 2000000
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/1
 no ip address
 shutdown
 clock rate 2000000
!
router bgp 65000
 no synchronization
 bgp log-neighbor-changes
 network 30.0.0.0
 network 40.0.0.0
 network 50.0.0.0
 network 60.0.0.0
 neighbor 1.1.1.1 remote-as 65001
 neighbor 1.1.1.1 ebgp-multihop 255
 neighbor 1.1.1.1 update-source Loopback0
 no auto-summary
!
ip forward-protocol nd
ip route 1.1.1.1 255.255.255.255 Serial0/0
ip route 30.0.0.0 255.0.0.0 Null0
ip route 40.0.0.0 255.0.0.0 Null0
ip route 50.0.0.0 255.0.0.0 Null0
ip route 60.0.0.0 255.0.0.0 Null0
!
:)