Let's say we're using the same network as yesterday, and redistributing from EIGRP to OSPF:
|Redistributing EIGRP -> OSPF|
So, let's add redistribution for Subnet L on R2:
route-map Connected->OSPF permit 10
match interface Loopback 0
route-map Connected->OSPF deny 20
router ospf 1
redistribute connected subnets route-map Connected->OSPF
What happened? R3 had three OSPF routes, now it only has two!
Subnet L was introduced to OSPF correctly, but the redistribute connected statement has overridden redistribution of Subnet S and Subnet B, so they've been withdrawn.
As "connected interfaces running EIGRP", subnets S and B had been introduced to OSPF by the redistribution of EIGRP, but our new redistribution directive (connected interfaces, but only if they're Loopback 0) has trumped redistribute eigrp's claim on them. They're now withdrawn from OSPF. Bummer.