- Use point-to-multipoint network type on the hub router to ensure the hub router is always the IP next hop for the DMVPN routes.
- Use point-to-multipoint network type on the spoke routers to ensure the OSPF timers match with the hub router.
- The DMVPN part of your network should be a separate OSPF area; if at all possible, make it a stub or NSSA area.
- If absolutely needed, use OSPF LSA flood filter on the hub router and a static default route on the spokes.
For more information, watch the DMVPN Technology and Configuration webinar.