How does EIGRP redistribute a static route to an interface?

Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco proprietary enhanced distance vector routing protocol, relying on the Diffused Update Algorithm (DUAL) to calculate the shortest path to a destination.

EIGRP can redistribute static routes as well as routes learned from other routing protocols.

When a static route to a destination is available pointing to an interface, rather than a next hop address, it can be redistributed into EIGRP either by issuing the redistribute static command or configuring a network command for the network in the static route.

The first option advertises the prefix as an EIGRP external route, while the second one advertises it as an EIGRP internal route.

For more information refer to:

Redistribution of Static Routes to Interfaces

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