hostname PE1.ASN4
!
interface Loopback0
 ip address 4.4.4.4 255.255.255.255
!
router bgp 4
 no synchronization
 bgp log-neighbor-changes
 bgp confederation identifier 9
 bgp confederation peers 3 
 network 4.4.4.0 mask 255.255.255.0
 neighbor 1.1.1.1 remote-as 1
 neighbor 1.1.1.1 update-source Loopback0
 neighbor 1.1.1.2 remote-as 1
 neighbor 1.1.1.2 update-source Loopback0
 neighbor 3.3.3.3 remote-as 3
 neighbor 3.3.3.3 update-source Loopback0
 no auto-summary
!
ip route 4.4.4.0 255.255.255.0 Null0
!
!
hostname PE1.ASN1
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
!
interface Serial1/2
 ip unnumbered Loopback0
 ip router isis 
 encapsulation ppp
 serial restart-delay 0
!
router isis 
 net 48.0001.0000.0000.0001.00
!
router bgp 1
 no synchronization
 bgp log-neighbor-changes
 network 1.1.1.0 mask 255.255.255.0
 neighbor 1.1.1.2 remote-as 1
 neighbor 4.4.4.4 remote-as 9
 neighbor 4.4.4.4 update-source Loopback0
 neighbor 10.10.10.1 remote-as 10
 neighbor 10.10.10.1 update-source Loopback0
 no auto-summary
!
ip classless
ip route 1.1.1.0 255.255.255.0 Null0