Dynamic Multipoint Virtual Private Network (DMVPN)[1] is a dynamic tunneling form of a virtual private network (VPN) supported on Cisco IOS-based routers, and Huawei AR G3 routers,[2] and on Unix-like operating systems.
DMVPN provides the capability for creating a dynamic-mesh VPN network without having to pre-configure (static) all possible tunnel end-point peers, including IPsec (Internet Protocol Security) and ISAKMP (Internet Security Association and Key Management Protocol) peers.
This dynamic-mesh capability alleviates the need for any load on the hub to route data between the spoke networks.
[4] Routing protocols such as OSPF, EIGRP v1 or v2 or BGP are generally run between the hub and spoke to allow for growth and scalability.
Both EIGRP and BGP allow a higher number of supported spokes per hub.