You are asked to provide a design that allows full dynamic routing updates between two networks: one network runs OSPF, and the other network runs EIGRP. Two links with an EIGRP neighbor…

Distribute lists are applied directly on the redistributing routers using access-lists or prefix-lists to permit only the correct prefixes in each direction, preventing routes learned from OSPF from being redistributed back into OSPF via EIGRP and vice versa; because they are applied at the redistribution point itself with no changes required elsewhere in the network, they represent the least reconfiguration effort compared to other loop-prevention methods.

Offset lists adjust EIGRP or RIP metrics for routes in or out of an interface but do not block route redistribution; routes with modified metrics can still be redistributed back into their origin domain and cause loops.

Route filtering is a generic term describing the broad category of filtering techniques and does not identify a specific, implementable method for preventing redistribution loops.

Route tagging marks redistributed routes with a numeric tag and then denies those tags on re-entry into the source domain, which is effective but requires modifying route maps on multiple routers and adding tag-match conditions, resulting in more reconfiguration effort than distribute lists.