This document provides a sample configuration for configuring On-Demand Routing (ODR) with Dynamic Multipoint VPN (DMVPN) in hub to spoke configuration. The DMVPN feature simplifies the hub router IPsec configuration and supports dynamic IP addresses at the spoke router. DMVPN combines Generic Routing Encapsulation (GRE) tunnels, IPsec encryption, and Next Hop Resolution Protocol (NHRP). It provides IP routing for remote sites, while minimizing the overhead on the network devices. This sample configuration also allows load balancing with dual ODR hub routers, failover to a single hub when a hub router fails, and the recovery from a hub router failure when it is recovered.
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