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Cisco DMVPN Configuration

In this technical demonstration, we will start with the core block of DMVPN which is GRE. Generic Routing Encapsulation (GRE) is a tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links or point-to-multipoint links over an Internet Protocol network. We will then move to add the DMVPN configuration parameters. Depending on the DMVPN phase you want to implement, DMVPN can be enabled with just a few commands. Obviously you need to have the underlay in place as you know DMVPN operates as the overlay that lays up an existing underlay network. In this demonstrationWe will go through DMVPN phase 1 which was the starting point of DMVPN and we will touch on DMVPN phase 3. We will have a look at the various DMVPN and NHRP configuration parameters along with the show commands.