R4

show ip bgp
show ip route 12.12.12.1


R6

debug ip bgp 4.4.4.4 updates
!
show ip bgp



R2

conf t
router ospf 2
network 12.12.12.2 0.0.0.0 area 0
passive-interface f0/0


R4

show ip bgp
show ip route 12.12.12.1



------------------------------------------------------------------


R2

show ip bgp



R6

conf t
router bgp 1
neighbor 4.4.4.4 next-hop-self

R4

show ip bgp