Any time you redistribute between two dynamic routing protocols in more than one place, you have the possibility of forming loops in the network. There are a couple of solutions:
-- Filter route based so they cannot be reinjected back into the protocol they came from at the redistribution point. This would normally be done so routes redistributed from OSPF into EIGRP are filtered from being redistributed back into OSPF at every redistribution point.
-- Use tags in EIGRP and OSPF to tag routes being redistributed out, and then blocking those routes from being redistributed at the other redistribution routers.
I don't know of any way to form a loop with a single point of redistribution--the router can only prefer one of the two routes available.
As for where to redistribute, it's hard for me to understand your network diagram. I would pick the one with the highest bandwidth link, or I would use the tags, as outlined on the tech note on Cisco Online, to redistribute in multiple places.
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