January 17, 2019


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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Initially, and that is the key word all spoke to spoke packets are switched across the hub. Our hub router will be the NHRP server and all other routers will be the spokes.

Full Access to our Lessons. Lastly, traffic between spokes in a point-to-point GRE VPN network must pass through the hub, wasting valuable bandwidth and introducing unnecessary bottlenecks.

I got it now. So explined a hub receives an IP packet inbound on its interface and switches it out of the same interface, it sends explaineed special NHRP redirect message to the source indicating that this is a suboptimal path. Share on LinkedIn Share.

It is important to note that mGRE interfaces do not have a tunnel destination. Share on Google Plus Share. Subscribe to our RSS Feed! This sounds pretty cool but it introduces some problems…. Email Updates Enter your email address to receive notifications of new posts. Ask a question or join the discussion by visiting our Community Forum.


Routed versus routing protocols Send WhatsApp alert during a network fault. When xeplained is traffic between the branch offices, we can tunnel it directly instead of sending it through the HQ router. Continue reading in our forum.

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

Right now we have a hub and spoke topology. The disadvantage of phase 1 is that there is no direct spoke to spoke tunnels.

Understanding Cisco DMVPN | CiscoZine

In seven years several things have changed: Web Vulnerability Scanner Free Download. Share on Twitter Tweet. Spoke3 replies directly to Spoke2 with its mapping information. We use cookies to ensure that we give you the best experience on our website. You may cancel your monthly membership at any time.

If you like to keep on reading, Become a Member Now! Looking at the process in more detail, when using Phase 3. When we use them, our picture could look explaind this:. All tunnel interfaces are part of the same network. Follow Us on Twitter! Hello Heng This is a very good question.


Introduction to DMVPN

The Hub router undertakes the role of the server while the spoke routers act as the clients. The hub router will dynamically accept spoke routers. We use cookies to give you the best personal experience on our website. Above we have two spoke routers NHRP clients which establish a tunnel to the hub router. This is great, we only required the hub to figure out what the public IP address is and all traffic can be sent from spoke to spoke directly.

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.

Explainedd 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. Above we have one router that represents the HQ and there are four branch offices.