Since Core1 and Core2 are not designated as management VDOMs, they rely on the root VDOM for connectivity to external resources such as FortiGuard updates. If the root VDOM lacks a VDOM link to these VDOMs or cannot reach FortiGuard services, security features like web filtering will stop working.

In an ADVPN (Auto-Discovery VPN) network, a dynamic VPN tunnel is established on-demand between spokes to optimize traffic flow and reduce latency.
Process:
1. Traffic Initiation:
A client behind Spoke-1 sends traffic to a device behind Spoke-2.
The traffic initially flows through the hub, following the pre-established overlay tunnel.
2. Hub Detection:
The hub detects that Spoke-1 is communicating with Spoke-2 and determines that a direct shortcut tunnel between the spokes can optimize the connection.
3. Shortcut Offer:
The hub sends a "Shortcut Offer" message to Spoke-1, informing it that a direct dynamic tunnel to Spoke-2 is possible.
4. Tunnel Establishment:
Spoke-1 and Spoke-2 then negotiate and establish a direct IPsec tunnel for communication.