It is not worked out that way. VPNs are only built between spokes and hubs. Spokes do not build VPNs to other spokes. Hubs do build VPNs to other hubs. If you have 20 remote branches terminating on 1 hub, then each remote branch has a single VPN and the hub would end up with 20 VPNs. If you were usual dual Internet connections at each branch and SDWAN, then each branch would have 2 VPNs, and the hub would have 40 VPNs.
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