R1#sh run | b router
router bgp 300
 no synchronization
 bgp router-id 1.1.1.1
 bgp log-neighbor-changes
 network 1.1.1.1 mask 255.255.255.255
 network 17.57.100.0 mask 255.255.255.0
 network 180.40.7.64 mask 255.255.255.224
 network 180.40.7.128 mask 255.255.255.224
 network 208.28.1.0 mask 255.255.255.248
 network 208.28.1.64 mask 255.255.255.240
 neighbor 17.57.100.2 remote-as 300
 neighbor 17.57.100.2 next-hop-self
 neighbor 180.40.7.65 remote-as 100
 neighbor 180.40.7.129 remote-as 100
 neighbor 208.28.1.2 remote-as 100
 neighbor 208.28.1.2 route-map Prob5 out
 neighbor 208.28.1.65 remote-as 200
 neighbor 208.28.1.65 route-map ToS5 out
 no auto-summary
!
no ip http server
ip classless
!
!
!
access-list 1 permit 17.57.102.0
!
route-map Prob5 permit 10
 match ip address 1
 set metric 4
!
route-map Prob5 permit 20


R3#sh run | b router
router bgp 100
 no synchronization
 bgp router-id 3.3.3.3
 bgp log-neighbor-changes
 bgp bestpath med missing-as-worst   <------------------ on R2 & R4
 network 3.3.3.3 mask 255.255.255.255
 neighbor 17.80.1.2 remote-as 100
 neighbor 17.80.1.2 route-reflector-client
 neighbor 17.80.1.2 next-hop-self
 neighbor 180.40.7.2 remote-as 100
 neighbor 180.40.7.2 route-reflector-client
 neighbor 208.28.1.1 remote-as 300
 no auto-summary
!