DMVPN Phase 3 Basic Configuration

Hello Giovanni

A hierarchical DMVPN topology is one where you have multiple levels of hubs. In other words, you can have a spoke that plays the role of a hub to multiple sub-spokes. The following Cisco documentation describes this in detail:

https://www.cisco.com/c/en/us/support/docs/security/dynamic-multipoint-vpn-dmvpn/211292-Configure-Phase-3-Hierarchical-DMVPN-wit.html

Only Phase 3 DMVPN supports this topology.

I see that this question is specifically in the CCNP Enterprise Advanced Routing ENARSI 300-410 Official Cert Guide. Note that this type of DMVPN topology is not explicitly described as being in the list of covered topics, however, it is good to know about it.

I hope this has been helpful!

Laz