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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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.

An article by Fabio Semperboni Tutorial. Cisco DMVPN uses a exxplained 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.

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. As you can notice, the network 1 Share on Facebook Share. It is important to note that mGRE interfaces do not have a tunnel destination. Share on Digg Share.

This sounds pretty cool but it introduces some problems…. Join us on Youtube! So when a hub receives an IP explainfd inbound on its interface and switches it out of the same interface, it sends a special NHRP redirect message to the source indicating that this is a suboptimal path.


The request gets forwarded from HUB to Spoke3. The hub exp,ained will dynamically accept spoke routers. When we use GRE Multipoint, there will be only one tunnel interface on each router. Furthermore, spoke-to-spoke traffic no longer needs to pass through the hub router but is sent directly from one spoke to another.

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Introduction to DMVPN |

The hub is the only edplained that is using a multipoint GRE interface, all spokes will be using regular point-to-point GRE tunnel interfaces. I got it now. Above we have two spoke routers NHRP clients which establish a tunnel to the hub router.

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Understanding Cisco DMVPN

More Lessons Added Every Week! Because mGRE tunnels do not have a tunnel destination defined, they cannot be used alone. Our hub router will be the NHRP server and all other routers will be the spokes.

With mGRE, all spokes are configured with only one tunnel interface, no matter explanied many spokes they can connect to.

Understanding Cisco Dynamic Multipoint VPN – DMVPN, mGRE, NHRP

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. 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. Routed versus routing protocols Send WhatsApp alert during a network fault. A few seconds later, spoke1 decides explaoned it wants to send something to spoke2.


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Understanding Cisco Dynamic Multipoint VPN – DMVPN, mGRE, NHRP

Since our traffic has to go through the hub, our routing configuration will be quite simple. Ask a question or join the discussion by visiting our Community Forum. Follow Us on Twitter! Allow spokes to build a spoke-to-spoke tunnel on demand with these restrictions: On the GRE multipoint tunnel interface we use a single subnet with the following private IP addresses:.

In seven years several things have changed: Share on LinkedIn Share. Hello Lagapides Thank you so much for your time.

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In phase 2, all spoke routers use multipoint GRE tunnels so we do have direct spoke to spoke tunneling. The hub router is configured with three separate tunnel interfaces, one for each spoke:. Share on Google Plus Share.