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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Multipoint GRE, as the name implies allows us to have multiple destinations. DMVPN consists of two mainly deployment designs:. 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.

In our diagram below, this is network The hub router will dynamically accept spoke routers. Hello Heng This is a very good question. More Lessons Added Every Week! If you like to keep on reading, Become a Member Now! 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.

I understand the differences between the three, but do we gain any benefit from implementing one or the other that is noticeable to end users? The hub router is configured with three separate tunnel interfaces, one for each spoke:.

Right now we have a hub and spoke topology. The hub is the only router that is using a multipoint GRE interface, all spokes will be using regular point-to-point GRE tunnel interfaces. Email Updates Enter your email address to receive notifications of new posts. Continue reading in our forum.

Hello Lagapides Thank you so much for your time. Forum Replies Rene, When would we choose to use Phase 1, 2, or 3, and why?


When we use them, our picture could look like this:. You may cancel your monthly membership at any time. Initially, and that is the key word all spoke to spoke packets are switched across the hub. Join us on Facebbook!

Understanding Cisco DMVPN | CiscoZine

Our hub router will be the NHRP server and all other routers will explanied the spokes. Spoke3 replies directly to Spoke2 with its mapping information. The Hub router undertakes the role of the server while the spoke routers act as the clients. In addition, the hub router has three GRE tunnels configured, one for each spoke, making the overall configuration more complicated. The request gets forwarded from HUB to Spoke3.

Lastly, traffic between spokes in a point-to-point GRE VPN network must pass through the hub, wasting valuable bandwidth and introducing unnecessary bottlenecks. Share on LinkedIn Share. Join us on Youtube! Unified Communications Components – Understanding Your When we use GRE Multipoint, there will be only one tunnel interface on each router. All spokes connect directly to the hub using a tunnel interface.

Introduction to DMVPN

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. Share on Twitter Tweet. Because mGRE tunnels do not have a tunnel destination defined, they cannot be used alone. All tunnel interfaces are part of the same network.

This is great, we only required the hub to figure out what the public IP address is and all traffic can be sent from ezplained to spoke directly.

Introduction to DMVPN |

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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. A few seconds later, spoke1 decides that explsined wants to send something to spoke2. In phase 2, all spoke routers use multipoint GRE tunnels so we do have direct spoke to spoke tunneling.

Cisco DMVPN uses a centralized architecture to provide easier implementation and management for deployments that require granular access controls for diverse user communities, including mobile workers, telecommuters, and extranet users.

It should look for a better way using NHRP resolution. Because all spoke-to-spoke traffic in DMVPN Phase1 always traverses the hub, it is actually inefficient to even send the entire routing table from the hub to the spokes.

As you can notice, the network 1 We use cookies to give you the best personal experience dmvln our website. We use cookies to ensure that we give you the best experience on our website. By using our website, you agree to our use of cookies Read more. With phase 1 we use NHRP so that spokes can register themselves with the hub. Explaiend got it now.

In seven years several things have changed: Furthermore, spoke-to-spoke traffic no longer needs to pass through the hub router but is sent directly from one spoke to another. In an old postdatedI explained various types of VPN technologies. Since our traffic has to go through the hub, our routing configuration will be quite simple. Each router is connected to the Internet and has a public IP address:.