- FAP-U431F radios 'Operation Status' show 'PowerDown' in 'show interfaces Dot11Radio' output due to 802.3af PoE power:
show interfaces Dot11Radio
AP ID AP Name IfIndex AP Model AP Mode Admin State Op State RF Band Primary Oper Channel Channel Width Uplink Type Feature Override Group
3 AP-3 3 FAP-U431F ScanRogues Up PowerDown 802.11ac 52 52 20-mhz Downlink 0 off
3 AP-3 2 FAP-U431F Service Up PowerDown 802.11ax_5 36 36 40-mhz-extension-channel-above Downlink 0 off
3 AP-3 1 FAP-U431F Service Up PowerDown 802.11ax_2 1 1 20-mhz Downlink 0 off
2. When the radios are in a 'PowerDown' state, the radios do not broadcast the SSIDs. Instead of that, the radios should be in 'Enabled' mode.
3. Per AP datasheet, FAP-U431F requires 802.3at (PoE+) power. For other AP models PoE power requirements, refer to the datasheet: FortiAP u-series.
4. Ensure the AP uplink Switch is PoE+ compliant and enable LLDP-MED Power Negotiation (refer to Switch user guide for instructions).
5. To verify the current PoE power drawn on the AP, use the below commands on WLC and AP CLI:
show ap <AP_ID>
Connectivity Layer : L2
Dataplane Encryption : None
AP Model : FAP-U431F
Power Supply Type : 802.3-af >>>>>>>>>>> Instead it should be 802.3-at
conn ap <AP_ID>
ap 4> sys p
Power Supply Type : POE-AF
6. If the issue remains then upgrade WLC to the new 8.6-5 because there is a similar bug 783465 which is fixed in WLC 8.6-5 (release notes link below). Before WLC upgrade, download the WLC running-config backup and diagnostics: FortiWLC release notes: fixed issues.
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