# Introduction to DMVPN

**URL:** https://forum.networklessons.com/t/introduction-to-dmvpn/1300
**Category:** Lessons Discussion
**Created:** [December 29, 2016, 8:19pm UTC](https://forum.networklessons.com/t/introduction-to-dmvpn/1300 "2016-12-29T20:19:48Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![ReneMolenaar](https://cdn-forum.networklessons.com/user_avatar/forum.networklessons.com/renemolenaar/32/488_2.png) [@ReneMolenaar](https://forum.networklessons.com/u/ReneMolenaar)
#### Post date: [December 8, 2015, 8:40am UTC](https://forum.networklessons.com/t/introduction-to-dmvpn/1300/3 "2015-12-08T08:40:25Z")

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Hi Patrick,

The different versions are like an evolution of DMVPN. We don’t really use phase 1 anymore unless you have a really good reason why you want to force all traffic through the hub (security perhaps?). Otherwise, it’s more effective to allow spoke-to-spoke traffic.

Both phase 2 and 3 allow spoke-to-spoke traffic, the advantage of phase 3 is that we use the “shortcuts” so you don’t need specific entries anymore in the routing tables of the spoke routers. I can’t think of any advantages right now that phase 2 has over phase 3 so if you implement this, you probably want to use phase 3.

Rene

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