R3

route-map ospftoeigrp deny 10
match tag 9023

route-map ospftoeigrp permit 99
set tag 11023

route-map eigrptoospf deny 10
match tag 11023

route-map eigrptoospf permit 99
set tag 9023

router eigrp x
redistribute ospf x metric 1 1 1 1 1 route-map ospftoeigrp

router ospf x
redistribute eigrp x metric-type 1 subnets route-map eigrptoospf


R4
router eigrp x
redistribute ospf x metric 1 1 1 1 1 route-map ospftoeigrp

router ospf x
default-information originate always

route-map ospftoeigrp deny 10
match tag 9045

route-map ospftoeigrp permit 99
set tag 9045