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| 1. | A DMVPN cloud is a collection of routers that are configured with either an mGRE interface or a point-to-point GRE interface (or a combination of the two) and that share the same subnet. |
| 2. | The subnet size created on the mGRE interface on the hub must be large enough to accommodate all the spoke routers’ GRE interfaces. |
| 3. | The NHRP network ID must be the same on the NHRP server and its NHRP clients. |
| 4. | The Cisco DMVPN solution integrates NHRP, GRE, and IPsec. |
| 5. | DMVPN greatly simplifies the configuration requirements on the hub router. |
| 6. | NHRP on the hub provides DMVPN spokes with the ability to locate other spoke routers. |
| 7. | Dynamic routing populates each spoke’s routing table so that each spoke knows about the subnets behind the other spokes. |
| 8. | In a hub-and-spoke deployment, all traffic between spokes must flow through the hub router. |