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New out of box 9130/9136/916x APs going through continuous reboots with 9300H upoe+ switch or the issue may also be seen if an existing APs reload and try to power up again.
When new APs boot up or AP reboot and join back on WLC. Other types of switches are not impacted.
Turn off CDP on the switch or switch port where APs are plugged. Cisco is working to build APSP for 17.9.4a/17.9.5. Fix exists on 17.12.3
Switch will log following messages: *May 15 22:28:29.163: %ILPOWER-5-DETECT: Interface Gi1/0/45: Power Device detected: IEEE PD *May 15 22:28:32.139: %ILPOWER-5-POWER_GRANTED: Interface Gi1/0/45: Power granted *May 15 22:28:32.139: %ILPOWER-5-PWRGOOD_SPARE_PAIR: Interface Gi1/0/45: spare pair power good *May 15 22:29:50.979: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/45, changed state to up *May 15 22:29:51.979: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/45, changed state to up *May 15 22:30:25.334: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/45, changed state to down *May 15 22:30:26.335: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/45, changed state to down *May 15 22:30:29.096: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/45, changed state to up *May 15 22:30:30.095: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/45, changed state to up *May 15 22:30:33.799: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/45, changed state to down *May 15 22:30:34.222: %ILPOWER-5-PD_ENTRY_REMOVAL: Interface GigabitEthernet1/0/45: power device entry removed, admin_state=AUTO oper_state=ON *May 15 22:30:34.223: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/45: PD removed *May 15 22:30:34.223: %ILPOWER-5-IEEE_DISCONNECT: Interface Gi1/0/45: PD removed *May 15 22:30:34.798: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/45, changed state to down
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