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Final correction: EIGRP next hop processing

Last week I’ve incorrectly claimed that EIGRP cannot set the IP next-hop of an advertised route to a third-party router. That hasn’t been true since IOS release 12.3 which introduced the no ip next-hop-self eigrp as-number interface configuration command.

With the EIGRP next-hop processing enabled, the next-hop field is set in the outbound EIGRP updates if the next hop router belongs to the IP subnet of the outgoing interface. This functionality works well in NBMA networks (including DMVPN tunnels) as well as in route redistribution scenarios.

The details are described in the EIGRP next-hop processing article in the CT3 wiki.

Thanks again to alvarezp for pointing out my mistake.

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