Summary
In summary, DMVPN is a frame-work technology, consisting of:
- Generic Routing Encapsulation (GRE), RFC 1701, or multipoint GRE if spoke-to-spoke tunnels are desired
- NHRP (next-hop resolution protocol), RFC 2332
- IPsec (Internet Protocol Security) using an IPsec profile, which is associated to a virtual tunnel interface in IOS software. All traffic sent via the tunnel is encrypted per the policy configured (IPsec transform set)
- An IP based routing protocol, EIGRP, OSPF, RIPv2, BGP or ODR (DMVPN hub-and-spoke only).
Read more about this topic: Dynamic Multipoint Virtual Private Network
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