topic Re: AP Operational state Down in Wireless

AP Operational state Down

gm446 — Wed, 14 Feb 2024 13:07:52 GMT

Hi all,

i have 2 AIR-AP3802I-I-K9 Access Points which was connected directly to the 3504 Controller and worked fine.
On last Sunday we moved the controller to our data-center and now the APs are connected through switch.
the connection is L2 P2P line so the APs in the same VLAN and Subnet as the Controller and communication is fine(ping). we have other APs with the same configuration in other sites and they also work fine.
the Access Points is joined but operational state is Down even they are associated with AP Group and WLAN and Admin Status for both radios is UP.
i tried with POE (15.4W) and with Power Injector but status is the same. those Access Point only works when they connect directly to the controller.
i will love for any insight on this issue.

Best Regards,

Yossi.

Re: AP Operational state Down

RxTx — Wed, 14 Feb 2024 13:27:22 GMT

Hi,

you'r problem it is power source to AP:

Cisco Aironet 3800 Series AccessPoints Input power requirements: ● 802.3at PoE+, Cisco Universal Power over Ethernet (Cisco UPOE®) ● 802.3at power injector (AIR-PWRINJ6=) ● 50W power supply (AIR-PWR-50=) Power draw ● 25.8W at the PSE (22.5W at the PD) with all features enabled except for the USB 2.0 port ● 30W at the PSE (25.5W at the PD) with the USB 2.0 port enabled

Re: AP Operational state Down

gm446 — Wed, 14 Feb 2024 13:51:51 GMT

Hi,
Thank you for the answer.
so this power injector will work?
https://www.ebay.com/itm/175176918009

Re: AP Operational state Down

RxTx — Wed, 14 Feb 2024 14:17:50 GMT

No, that one it is a 15W PoE Injector.

Search for AIR-PWRINJ6= that output 30W or more.

Re: AP Operational state Down

Rich R — Wed, 14 Feb 2024 16:02:18 GMT

You need a switch with POE+ (30W) which supports CDP (Cisco) or LLDP (Cisco and other vendors) because the AP requires CDP or LLDP to negotiate POE+ (802.3at) power.
Or the Cisco power injector which @RxTx referenced above.
Without that (as you have observed) the AP will start up with all radios shutdown due to low power condition.
This will also be visible on the WLC GUI where it will show "Low power" against those APs.