Great treat on a Friday afternoon.
Plaque came in the mail today.

In Cisco IOS, when you are redistributing between routing protocols, redistribution is not transitive, with connected networks of the source protocol being excepted. However, if you explicitly redistribute connected, then the exception is removed and all connected networks must be explicitly redistributed. It can be a bit confusing, hence the reason to break it down and write about it.
Let’s set up an example and observe the behavior.
We’ll make R1 a border router between RIP and OSPF. R2 will be an OSPF router.
R2’s routing table:
Now, let’s redistribute R1’s loopback into OSPF and see what happens:
The loopback is advertised, but the 11.11.11.0/24 network has been withdrawn.
Let’s redistribute our loopback into RIP instead
Now we got nothin’:
To break it down, there’s two things happening here:
Any time you’re asked to redistribute connected into a border router, be mindful to pick up any additional interfaces that need to be seen by the destination routing protocol in your route map.