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.

Author: Junris Aralkree
Country: Gabon
Language: English (Spanish)
Genre: Sex
Published (Last): 4 May 2015
Pages: 435
PDF File Size: 11.1 Mb
ePub File Size: 9.84 Mb
ISBN: 345-1-46508-642-8
Downloads: 69241
Price: Free* [*Free Regsitration Required]
Uploader: Goltikree

The hub router will dynamically accept spoke routers. It should look for a better way using NHRP resolution. Explained As Simple As Possible. Deal with bandwidth spikes Free Download. In both cases, the Hub router is assigned a static public IP Address while the branch d,vpn spokes can be assigned static or dynamic public IP addresses.

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

Follow Us on Twitter! 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. So when a hub receives an IP packet inbound on its exolained 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.


Web Vulnerability Scanner Free Download.

In our diagram below, this is network Furthermore, spoke-to-spoke traffic no longer needs to pass through the hub router but is sent directly from one spoke to another. All spokes connect directly to the hub dmvppn a tunnel interface.

Understanding Cisco Dynamic Multipoint VPN – DMVPN, mGRE, NHRP

Spoke3 replies directly to Spoke2 with its mapping information. All tunnel interfaces are part of the same network.

Articles To Read Next: Share on Facebook Share. It is important to note that mGRE interfaces do not have explaied tunnel destination. We use cookies to give you the best personal experience on our website. Ask a question or join the discussion by visiting our Community Forum.

Understanding Cisco DMVPN | CiscoZine

If you like to keep on reading, Become a Member Now! This sounds pretty cool but it introduces some problems…. The disadvantage of phase 1 is that there is no direct spoke to spoke tunnels. When would we choose to use Phase 1, 2, or 3, and why? A few seconds later, spoke1 decides that it wants to send something to spoke2. Subscribe to our RSS Feed!

Understanding Cisco Dynamic Multipoint VPN – DMVPN, mGRE, NHRP

Looking at the process in more detail, when using Phase 3. With mGRE, all spokes are configured with only one tunnel interface, no matter how many spokes they can connect to. Forum Replies Rene, When would we choose to use Phase 1, 2, or 3, and why?


Join us on LinkedIn! Above we have two spoke routers NHRP clients which establish a tunnel to the hub router.

Understanding Cisco 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. Initially, and that is the key word all spoke to spoke packets are switched across the hub.

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

I got it now. On the GRE multipoint tunnel interface we use a single subnet with the following private IP addresses:. Multipoint GRE, as the name implies allows us to have multiple destinations. Share on LinkedIn Share.

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? Hello Lagapides Thank you so much for your time. Join us on Youtube!

Unified Communications Components – Understanding Your The HQ for example has one tunnel with each branch office as its destination.