The difference between DMVPN Phase 2 and Phase 3  can be understood in terms of routing.   So for an example, let's take spoke 1's tunnel ip as 192.168.1.2/24 and spoke B tunnel ip address as 192.168.1.3/24 both of them registering to the same hub 192.168.1.1/24. Consider that we are using EIGRP as a routing protocol. Here's is how phase 2 and phase 3 would look like     Phase... (more)