The debug output captures the FortiLink protocol (FLP) state transitions and keepalive mechanisms between FortiSwitch and FortiGate. The transition from FL_STATE_WAIT_JOIN to FL_STATE_READY demonstrates that the switch has been successfully discovered and authorized by the FortiGate, rendering it fully operational. Once authorized and in the READY state, the switch begins sending keepalive messages. The flp_send_pkt log entries showing type(5) packets transmitted exactly three seconds apart (at 12:13:21 and 12:13:24) represent FortiLink heartbeats. These heartbeats are standard functionality, sent from the managed FortiSwitch to the FortiGate controller to maintain the connection status and confirm ongoing availability.

C. The switch is no longer waiting; it successfully transitioned from FL_STATE_WAIT_JOIN to FL_STATE_READY, confirming it has already joined the stack group and is fully authorized.

D. The output displays state transitions and heartbeat (Type 5) packet transmissions; it contains no logs or protocol events related to hostname configuration or pushing hostname updates.

Fortinet, "NSE 6 - FortiSwitch 7.2 Administrator Study Guide", Chapter: FortiLink, Section: Troubleshooting and Debugging FortiLink, p. 410.

Fortinet, "FortiOS 7.2.0 Administration Guide", Document ID: FT-FOS-72-Admin, Section: Switch Controller -> FortiLink Operation and Packet Types.