Redistribution into OSPF

As you might expect, OSPF redistribution has several similarities and differences as compared to redistribution into EIGRP. Unlike EIGRP, OSPF does have useful default metrics for redistributed routes, but OSPF does use the same general methods to configure metrics for redistributed routes. Like EIGRP, OSPF flags redistributed routes as being external. Unlike EIGRP, OSPF creates LSAs to represent each external route, and OSPF must then apply some much different logic than EIGRP to calculate the best route to each external subnet.

This section examines the OSPF redistribution process and configuration. It also discusses background on three OSPF LSA Types—Types 4, 5, and 7—all created to help OSPF distribute information ...

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