According to the SD-WAN 7.2 Study Guide, the SD-WAN overlay template simplifies the configuration of IPsec tunnels in a hub-and-spoke topology. The template defines the following parameters:
* type: dynamic for spokes, static for hubs
* interface: the WAN interface to use for the IPsec tunnel
* network-overlay: enable for spokes, disable for hubs
* network-id: a unique identifier for each spoke
* auto-discovery-sender: enable for hubs, disable for spokes
* auto-discovery-receiver: enable for spokes, disable for hubs
Based on the exhibit, the FortiGate device has the following configuration:
* type: dynamic
* interface: port1
* network-overlay: enable
* network-id: 5
* auto-discovery-sender: disable
* auto-discovery-receiver: enable
Therefore, the FortiGate device is a spoke that establishes dynamic IPsec tunnels to the hub. It also has the network-overlay and auto-discovery-receiver options enabled, which means it can send ADVPN shortcut requests to other spokes when it receives a shortcut offer from the hub