Refer to the exhibit.

According to theFortiOS 7.6 Study Guideand theFortiSwitch 7.6 FortiLink Guide, the health of the Control and Provisioning of Wireless Access Points (CAPWAP) based management tunnel between a FortiGate and a FortiSwitch is maintained through a continuous keepalive mechanism. The provided exhibit captures the fortilinkd process logs, which are essential for verifying the operational status of the FortiLink control plane.

The debug output reveals two critical indicators of a successful connection:

State Transitions:The lines at timestamp 341s show the managed switch (FS24VMTM25000128) has reached theFL_STATE_READYstate. This state indicates that the discovery, authorization, and configuration synchronization phases are complete, and the switch is now fully operational under the FortiGate ' s management.

Heartbeat Mechanism:The entry flp_send_pkt[469]:pkt-sent {type(5)} represents the transmission of aFortiLink heartbeat. TheseType 5 packetsare sent every few seconds to verify that the peer device is still reachable and responsive. In a healthy environment, the FortiGate sends these heartbeats, and the FortiSwitch responds (or vice versa depending on the specific sub-protocol phase), ensuring the management tunnel remains active.

The regular exchange of these messages as shown in the exhibit confirms that the FortiLink connection ishealthy and active. If the switch were unauthorized or stuck in a negotiation phase, the state would be shown as FL_STATE_WAIT_AUTH or FL_STATE_DISCOVERY, and the periodic type(5) heartbeats would either be absent or not acknowledged.