VPN Phase selection greatly affects routing protocol configuration and how it works over the logical topology.
In its simplest form, DMVPN is a point-to-multipoint Layer 3 overlay VPN enabling logical hub and spoke topology supporting direct spoke-to-spoke communications depending on DMVPN design ( Phase 1, Phase 2 and Phase 3 ) selection. Tunnels on spokes establish on-demand based on traffic patterns without repeated configuration on hubs or spokes.
Dynamic Multipoint Virtual Private Network ( DMVPN ) is a dynamic form of a virtual private network ( VPN ) that allows a mesh of VPNs without the need to pre-configure all tunnel endpoints i.e spokes.
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