Dynamic Multipoint Virtual Private Network


Dynamic Multipoint Virtual Private Network is a dynamic tunneling form of a virtual private network supported on Cisco IOS-based routers, Huawei AR G3 routers and USG firewalls, and on Unix-like operating systems.

Benefits

DMVPN provides the capability for creating a dynamic-mesh VPN network without having to pre-configure all possible tunnel end-point peers, including IPsec and ISAKMP peers. DMVPN is initially configured to build out a hub-and-spoke network by statically configuring the hubs 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 without additional configuration on the hubs or spokes. This dynamic-mesh capability alleviates the need for any load on the hub to route data between the spoke networks..

Technologies

s 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.

Encryption

As with GRE tunnels, DMVPN allows for several encryption schemes for the encryption of data traversing the tunnels. For security reasons Cisco recommend that customers use AES.

Phases

DMVPN has three phases that route data differently.