Which parameter must be the same on every router in a DMVPN Phase 3 cloud?
In a DMVPN Phase 3 deployment, every router in the same DMVPN cloud (hub and spokes) must be configured with the same NHRP network ID on the multipoint GRE tunnel interface, because NHRP uses this identifier to determine cloud membership and to process NHRP resolution requests and replies that enable direct spoke-to-spoke tunnel establishment.
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