The Correct One.
mGRE–> Multiple GRE Tunnel Interface is used to allow a single GRE interface to support multiple IPSec tunnels and helps dramatically to simplify the complexity and size of the configuration.
NHRP –> NHRP is layer 2 resolution “PROTOCOL” and cache
The Correct One.
mGRE–> Multiple GRE Tunnel Interface is used to allow a single GRE interface to support multiple IPSec tunnels and helps dramatically to simplify the complexity and size of the configuration.
NHRP –> NHRP is layer 2 resolution “PROTOCOL” and cache
hub 1
mGRE 3
NHRP 4
spoke 2
https://www.cisco.com/c/en/us/products/security/dynamic-multipoint-vpn-dmvpn/presentation-listing.html