!
router bgp 65002
 no bgp ebgp-requires-policy
 bgp conditional-advertisement timer 5
 neighbor 192.168.1.1 remote-as external
 neighbor 192.168.1.1 timers 3 10
 neighbor 192.168.2.1 remote-as external
 neighbor 192.168.2.1 timers 3 10
 address-family ipv4 unicast
  redistribute static
  neighbor 192.168.1.1 advertise-map advertise exist-map exist
  neighbor 192.168.1.1 route-map deny-all out
  neighbor 192.168.2.1 route-map exist in
 exit-address-family
!
ip prefix-list exist seq 5 permit 172.16.255.3/32
ip prefix-list advertise seq 5 permit 172.16.255.2/32
!
route-map advertise permit 10
 match ip address prefix-list advertise
exit
!
route-map exist permit 10
 match ip address prefix-list exist
exit
!
route-map deny-all deny 10
exit