!
router ospf
 redistribute connected
 redistribute bgp route-map bgp-to-ospf
[...]

ip prefix-list into-ospf seq 5 permit 172.17.1.0/24 le 32
ip prefix-list into-ospf seq 10 deny 0.0.0.0/0 le 32
!
route-map bgp-to-ospf deny 5
 match ip address into-ospf
!
route-map bgp-to-ospf permit 10