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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Above we have one router that represents the HQ and there are four branch offices. Web Vulnerability Scanner Free Download.

Understanding Cisco DMVPN

More Lessons Added Every Week! As you can notice, the network 1 Unified Communications Components – Understanding Your 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.

Hello Lagapides Thank you so much for your time. 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. The following requirements have been calculated for a traditional VPN network of a company with a central hub and 30 remote offices.

Full Access exllained our Lessons. The HQ for example has one tunnel with each branch office as its destination. Allow spokes to build a spoke-to-spoke tunnel on demand with these restrictions: Right now we have a hub and spoke topology.

Send this to a friend Your email Recipient email Send Cancel. By using our website, you agree to our use of cookies Read more. All tunnel interfaces are part of the same network. Our hub router will be the NHRP server and all other routers will be the spokes. I got it now. 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.


Looking at the process in more detail, when using Phase 3. We use cookies to ensure that we give you the best experience on our website.

Understanding Cisco Dynamic Multipoint VPN – DMVPN, mGRE, NHRP

Share on LinkedIn Share. Share on Facebook Share. Share on Google Plus Share. Above we explaine two spoke routers NHRP clients which establish a tunnel to the hub router. In an old postdatedI explained various types of VPN technologies. The Hub router checks its cache, finds an entry for spoke 2 and sends the NHRP resolution reply to spoke1 with the public IP address of spoke2.

All spokes connect directly to the hub using a tunnel interface.

It is important to note that mGRE interfaces do not have a tunnel destination. Subscribe to our RSS Feed! Join us on Youtube!

Each router is explxined to the Internet and has a public IP address:. Explained As Simple As Possible. The Hub router undertakes the role of the server while the spoke routers act as the clients. This means that there will be no direct spoke-to-spoke communication, all traffic has to go through the hub!

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Introduction to DMVPN |

DMVPN provides a number of benefits which have helped make them very popular and highly recommended. 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 explaibed users?


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Multipoint GRE, as the name implies allows us to have multiple destinations. In seven years several things have changed: At this point, the spokes can now modify their routing table entries to reflect the NHRP shortcut route edplained use it to reach the remote spoke.

When there is explaind between the branch offices, we can tunnel it directly instead of sending it through the HQ router. Email Updates Enter your email address eexplained receive notifications of new posts. Furthermore, spoke-to-spoke traffic no longer needs to pass through the hub router but is sent directly from one spoke to another. 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.

Hello Heng This is a very good question.

Because mGRE tunnels do not have a tunnel destination defined, they cannot be used alone. If you like to keep on explqined, Become a Member Now! A few seconds later, spoke1 decides that it wants to send something to spoke2. Join us on Facebbook! Forum Replies Rene, When would we choose to use Phase 1, 2, or 3, and why?