Gre dmvpn

Hello sir I want to know about the Dynamic Multipoint VPN training program using GRE so please provide me information about the same.

[Shaleen]

A Dynamic Multipoint VPN is an evolved iteration of hub and spoke tunneling. A generic hub and spoke topology implements static tunnels between a centrally located hub router and its spokes

DMVPN

DMVPN stands for Dynamic Multipoint VPN and it is an effective solution for dynamic secure overlay networks.

In short, DMVPN is combination of the following technologies:

Multipoint GRE (mGRE)

Next-Hop Resolution Protocol (NHRP)

Dynamic Routing Protocol (EIGRP, RIP, OSPF, BGP)

Dynamic IPsec encryption

Cisco Express Forwarding (CEF)

Physical Connectivity:


HUB:

ROUTER 2

ROUTER 3

ROUTER 4

DMVPN Config:

Once you have physical connectivity you can add the DMVPN configuration.

HUB

ROUTER 2

ROUTER 3

ROUTER 4

IPSEC:

DMVPN ipsec.png

Dynamic Routing

dynamic routing.png

Verification:

Dynamic Tunnels:

dynamic tunnels.png

NHRP Tunnels: