Introduction. In this blog, I aim to go a little deeper into how the different DMVPN phases work and how to properly configure the routing. DMVPN Explained. DMVPN stands for Dynamic Multipoint VPN and it is an effective solution for dynamic secure overlay networks. In short. Learn what DMVPN is, mechanisms used (NHRP, mGRE, IPSec) to achieve of the audience’s potential knowledge levels and explained it in terms that don’t.

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Our hub router will be the NHRP server and all other routers will be the spokes. By using our website, you agree to our use of cookies Read more. Because mGRE tunnels do fmvpn have a tunnel destination defined, they cannot be used alone. Explained As Simple As Possible.

Understanding Cisco DMVPN

In phase 2, all spoke routers use multipoint GRE tunnels so we do have direct spoke to spoke tunneling. In seven years several things eplained changed: Unified Communications Components – Understanding Your Full Access to our Lessons. When we use GRE Multipoint, there will be only one tunnel interface on each router.

Deal with bandwidth spikes Free Download. Hello Lagapides Thank you so much for your time. Each router is connected to the Internet and has a public IP address:. The following requirements have been calculated for a traditional VPN network of a company with a central hub and 30 remote offices.


Share on Digg Share. Follow Us on Twitter! We use cookies to give you the best personal experience on our website. A few seconds later, spoke1 decides that it wants to send something to spoke2.

Understanding Cisco Dynamic Multipoint VPN – DMVPN, mGRE, NHRP

As stated, DMVPN greatly reduces the necessary configuration in a large scale VPN network by eliminating the necessity for crypto maps and other configuration requirements.

Join us on LinkedIn! At this point, the spokes can now modify their routing table entries to reflect the NHRP shortcut route and use it to reach the remote spoke. In both cases, the Hub router is assigned a static public IP Address while the branch routers spokes can be assigned static or dynamic public IP addresses. If you like to keep on reading, Become a Member Now!

Introduction to DMVPN

Above we have two spoke routers Explainedd clients which establish a tunnel to the hub router. In case no routing protocol is used in our VPN network, the addition of one more spoke would mean configuration changes to all routers so that the new spoke is reachable by everyone. The flexibility, stability and easy setup it provides are second-to-none, making it pretty much the best VPN solution available these days for any type of network.


Furthermore, spoke-to-spoke traffic no longer needs to pass through the hub router but is sent directly from one spoke to another.

Since our traffic has to go through the hub, our routing configuration will be quite simple. The disadvantage of phase 1 is that there is no direct spoke to spoke tunnels. Spoke routers only need a summary or default route to the hub to reach other spoke routers.

Initially, and that is the key word all spoke to spoke explaiend are switched across the hub. Share on Google Plus Share. Continue reading in our forum.

Looking at the process in more detail, when using Phase 3. The Hub router undertakes the role of the server while the spoke routers act as the clients.

In our diagram below, this is network Share on Twitter Tweet. All tunnel interfaces are part of the same network. In an old postdatedExplaind explained various types of VPN technologies.