Redistribution does not occur automatically, if you have a router with dual routing processes (eg:OSPF/EIGRP) and if it receives a prefix from one routing process it is not automatically advertised into the other.
Can you elaborate on this a little on your existing topology?
What redistribution are you performing (dynamic/static) and to/from what routing processes?
Are you using a single ospf area or multiple.
Are these routers directly connected?
Maybe post a topology diagram if applicable?
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