Was looking over some ot the task 2.4 threads and it looks like the task has been significantly revised to prevent the use of NSSA as a solution.
2.4 IGP Redistribution
- Redistribute between OSPF and EIGRP on R3.
- Redistribute as required to ensure full IPv4 reachability; no configuration changes are allowed on SW3.
- Prefixes not advertised into IGP do not have to be reachable at this point.
- Do not modify any AD values for this task
I did it different than the solution guide.
I did the two way redistribution on r3, then I just slapped an ospf distribute list on r1 to prevent any of the ospf routes from getting into the rib. This allowed eigrp on r1 to advertise the redistributed routes from r3 over the frame to r4 and r5. It also had the positive side effect of preventing an rpf failure in the multicast section.
R1:
!
route-map conn->eigrp permit 10
match interface FastEthernet0/0.13
!
ip prefix-list pl_ospf seq 5 deny 0.0.0.0/0 le 32
!
router eigrp 1024
! make sure vlan13 is reachable from the eigrp domain
redistribute connected metric 100000 1 1 1 1 route-map conn->eigrp
!
router ospf 1
distribute-list prefix pl_ospf in