A port authority builds Phase 3 DMVPN so branch spokes register to hub NHS addresses over the tunnel. What NHRP roles must the design assign for registration to succeed?
Select an answer to reveal the explanation.
Short Explanation
Think of the hub as the front desk where every branch checks in. Spokes are the clients (NHC) that register; hubs are the NHS servers that keep the mapping book. Flip those roles and nobody finds anybody on the overlay.
Full Explanation
In DMVPN, Next Hop Servers (NHS) typically run on hub routers and accept NHRP Registration Requests from Next Hop Clients (NHC) on the spokes. Each spoke registers its tunnel IP to NBMA (underlay) binding so hubs—and later spoke-to-spoke resolutions—can map overlay next hops. Reversing NHS/NHC, omitting NHS addresses on spokes, or replacing NHRP with static GRE peers breaks the dynamic mapping model Phase 3 depends on.