Before Phase 3, spoke-to-spoke tunnels were established through regional hubs. In Phase 3, spoke-to-spoke tunnels are established directly with each other, bypassing both the regional and central hubs.
- Chapter 16. Dynamic Multipoint VPN (DMVPN)
- from CCIE Professional Development Series Network Security Technologies and Solutions
- Publisher: Cisco Press
- Released: November 2016
Phase2 is for single-region design, so spoke-to-spoke tunnel between region needs "HUB-TO-HUB' connection.
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