It is important to note that mGRE interfaces do not have a tunnel destination. Because mGRE tunnels do not have a tunnel destination defined, they cannot be used alone. NHRP fills this gap by telling mGRE where to send the packets.
references: http://www.firewall.cx/cisco-technical-knowledgebase/cisco-services-tech/896-cisco-dmvpn-intro.html
Yes. That is quotation from the link:
"NHRP is required on mGRE tunnel interfaces because it provides the VPN-layer-IP to NBMA-layer-IP address mappings for forwarding IP data packets over the mGRE tunnel."
i should real answer "CEF" ... again, very interesting ...
Cisco Express Forwarding Fast Switching for mGRE
Currently, traffic in an mGRE interface is process-switched, resulting in poor performance. The DMVPN solution adds Cisco Express Forwarding switching for the mGRE traffic, resulting in much better performance. There are no configuration commands necessary to turn on this feature. If Cisco Express Forwarding switching is allowed on the GRE tunnel interface and the outgoing/incoming physical interfaces, then the multipoint GRE tunnel packets will be Cisco Express Forwarding-switched.
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