frr version 8.1
frr defaults traditional
hostname G
no ipv6 forwarding
!
interface eth1
 description C-eth3
 ip address 10.10.10.22/30
 ip ospf cost 100
exit
!
interface eth2
 description D-eth4
 ip address 10.10.10.30/30
 ip ospf cost 10
exit
!
interface eth3
 description R1-eth3
 ip address 203.0.113.9/30
exit
!
interface lo
 ip address 10.10.0.6/32
 ip ospf passive
exit
!
router bgp 65501
 bgp router-id 10.10.0.6
 no bgp ebgp-requires-policy
 neighbor 10.10.0.5 remote-as 65501
 neighbor 10.10.0.5 shutdown
 neighbor 10.10.0.5 update-source lo
 neighbor 203.0.113.10 remote-as 65503
 neighbor 203.0.113.10 update-source eth3
 !
 address-family ipv4 unicast
  redistribute ospf metric 10 route-map BGP-to-OSPF
  neighbor 10.10.0.5 next-hop-self
  neighbor 203.0.113.10 route-map PREPEND out
 exit-address-family
exit
!
router ospf
 ospf router-id 10.10.0.6
 redistribute bgp metric 20 metric-type 1 route-map BGP-to-OSPF
 network 10.10.0.6/32 area 2
 network 10.10.10.0/27 area 2
exit
!
ip prefix-list ALLOWED_ROUTES seq 10 permit 10.0.0.0/24 ge 32
ip prefix-list ALLOWED_ROUTES seq 20 permit 192.168.0.0/16 ge 24
ip prefix-list ALLOWED_ROUTES seq 30 deny 0.0.0.0/0 le 32
!
route-map BGP-to-OSPF permit 10
 match ip address prefix-list ALLOWED_ROUTES
exit
!
route-map PREPEND permit 10
 set as-path prepend 65501 65501
exit
!