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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The hub router will dynamically accept spoke routers. Each router is connected to the Internet and has a public IP address:. It needs to figure out the destination public IP address of spoke2 so it will send a NHRP resolution requestasking the Hub router what the public IP address of spoke 2 is. When there is traffic between the branch offices, we can tunnel it directly instead of sending it through the HQ router.

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. As you can notice, the network 1 Hello Heng This is a very good question.

Understanding Cisco Dynamic Multipoint VPN – DMVPN, mGRE, NHRP

In our diagram below, this is network Join us on Youtube! In addition, the hub router has three GRE tunnels configured, one for each spoke, making the overall configuration more complicated.


This means that there will be no direct spoke-to-spoke communication, all traffic has to go through the hub! Send this to a friend Your email Recipient email Send Cancel. Allow spokes to build a spoke-to-spoke tunnel on demand with these restrictions: The HQ for example has one tunnel with each branch office as its destination.

With phase 1 we use NHRP so that spokes can register themselves with dvmpn hub.

Unified Communications Components – Understanding Your Share on LinkedIn Share. The Hub router undertakes the role of the server while the spoke routers act as the clients.

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. Spoke3 replies directly to Spoke2 with its mapping information. Forum Replies Rene, When would we choose to use Phase 1, 2, or 3, and why? Because mGRE tunnels do not have a tunnel destination defined, they cannot be used alone.

Share on Google Plus Share. Since our traffic has to go through the hub, our routing configuration will be quite simple.

Introduction to DMVPN |

When we use them, our picture could look like emvpn. All spokes connect directly to the hub using a tunnel interface. DMVPN consists of two mainly deployment designs:. With mGRE, all spokes are configured with only one tunnel interface, no matter how many spokes they can connect to.


On the GRE multipoint tunnel interface we use a single subnet with the following private IP addresses:.

If you like to keep on reading, Become a Member Now! 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 Exolained addresses. Spoke routers only need a summary or default route to the hub to reach other spoke routers.

Web Vulnerability Scanner Free Download. Join us on LinkedIn! Lastly, traffic between spokes in a point-to-point GRE VPN network must pass through the hub, wasting valuable bandwidth and introducing unnecessary bottlenecks.

Introduction to DMVPN

An article by Fabio Semperboni Tutorial. 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? 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.

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