What advantages are there in using a fully Meshed IPSec VPN configuration instead of a hub and spoke set of IPSec tunnels?

A hub-and-spoke topology is inherently less redundant, as the hub acts as a single point of failure; achieving full redundancy often requires complex designs with multiple hubs or failover mechanisms.

Full mesh VPNs are significantly more complex to configure and manage than hub-and-spoke, especially as the number of sites increases, due to the large number of individual tunnels required.

The strength of IPSec encryption is determined by the cryptographic algorithms and key lengths used, not by the network topology (full mesh versus hub-and-spoke).

In a full mesh IPSec VPN, each site establishes a direct tunnel with every other site, eliminating single points of failure that exist in a hub-and-spoke setup where the central hub is critical. This direct connectivity ensures that if any single link or device fails, other sites can still communicate directly, providing the highest level of redundancy and fault tolerance.