Dynamic Multipoint Virtual Private Network

Dynamic Multipoint Virtual Private Network

Dynamic Multipoint Virtual Private Network (DMVPN) is a dynamic tunneling form of a virtual private network (VPN) supported on Cisco IOS-based routers based on the standard protocols, GRE, NHRP and IPsec. 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. DMVPN is initially configured to build out a hub-and-spoke network by statically configuring the hubs (VPN headends) on the spokes, no change in the configuration on the hub is required to accept new spokes. Using this initial hub-and-spoke network, tunnels between spokes can be dynamically built on demand (dynamic-mesh) without additional configuration on the hubs or spokes. This dynamic-mesh capability alleviates the need for and load on the hub to route data between the spoke networks.

DMVPN is combination of the following technologies:

  • Multipoint GRE (mGRE)
  • Next-Hop Resolution Protocol (NHRP)
  • Dynamic Routing Protocol (EIGRP, RIP, OSPF, BGP)
  • Dynamic IPsec encryption
  • Cisco Express Forwarding (CEF)


Read more about Dynamic Multipoint Virtual Private Network:  Configuration Details, Encryption, Summary

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