EIGRP over a multipoint interface is not forwarding traffic. Which action resolves the problem?

Disabling split horizon resolves EIGRP traffic forwarding issues over multipoint interfaces, especially in hub-and-spoke Frame Relay or DMVPN scenarios. Split horizon prevents a router from advertising a route out of the interface through which it was learned, which is beneficial on broadcast networks to prevent loops. However, on non-broadcast multipoint interfaces, this rule can prevent spokes from learning routes from other spokes via the hub, as the hub would not re-advertise a route back out the same multipoint interface it received it on. Disabling split horizon allows the hub to re-advertise routes, enabling full connectivity. Poison reverse is a loop prevention mechanism that advertises unreachable routes with an infinite metric; enabling or disabling it would not resolve this specific forwarding issue. Enabling split horizon would exacerbate the problem.