A Dynamic Multipoint Virtual Private Network is an enhancement of the virtual private network (VPN) configuration process of Cisco IOS-based routers. DMVPN prevents the need for pre-configured (static) IPSEC peers in Crypto map configurations and isakmp peer statements. This feature of Cisco IOS allows greater scalability over previous ipsec configurations. An ipsec tunnel between two Cisco routers may be created on an as needed basis. Tunnels may be created between a spoke router and a hub router (VPN headend), or between spokes. This greatly alleviates the need for the hub to route data between spoke networks, as was common in a non-fully meshed frame relay topology.
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