DMVPN Phase I overview

To understand the principles of DMVPN Phase I, remember these facts:

  • Spokes use point-to-point GRE tunnels;
  • Hub site has multipoint GRE tunnel;
  • All the traffic flows through the hub site;
  • The next-hop for routes received over DMVPN must be the hub site;
  • NHRP is used by the hub site to get spokes’ tunnel endpoint addresses.
  • Spoke sites use NHRP just to register with the hub site.
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