What is Multi-point GRE (mGRE)?
mGRE is key ingredient to build the DMVPN tunnel. Without mGRE we can’t build the DMVPN tunnel. DMVPN uses a combination of the following technologies to build the tunnel : 1. Multi-point GRE (mGRE) 2. Next-Hop Resolution Protocol (NHRP) 3. Dynamic Routing Protocol (EIGRP, RIP, OSPF, BGP) 4. Dynamic IP-Sec encryption(Optional) Point-to-Point Generic Routing Encapsulation (GRE) Tunnels: The traditionalRead More