While some POE interfaces may give power to devices , other interfaces may not work . The number of interfaces not working may depend on how much power is being reserved for already working ports.

Power consumption will be 0.0W for those affected interfaces and class will be shown as "not applicable" . This can be seen in the output of "show poe interface".

The max power seen with command "show poe interface (interface_name)" is the highest power that can be provided according to the respective standard . For example , 30 W for 802.3at .

The max power seen from "show poe interface" is the LLDP negotiated value and maybe less than the max defined by power standard.

The total poe power consumption for the chassis seen from "show poe controller" is based on operational power consumption for that interface and remaining power is calculated by subtracting from the total power which is 124W for this switch (will differ based on platform) .

However , if power will be given to any poe device or not is dependent on the remaining power calculated after subtracting sum of max power for all current active poe interfaces as seen from output of "show poe interface".

Check the power consumption for the working poe devices and set max power manually a little higher than the average consumption .

For example: The access points may take 7W power so max power can be set to 15W to accommodate surging power demands ( By default the access point may negotiate higher max power). This will override and reduce the max consumption set by lldp negotiation between switch and poe device and more power will be available for allocation to other devices.

You can set the max power manually using the following command :

#set poe interface (interface-name) (power value in watts)

Follow this up with a reboot to take effect.

Note : Increase the max power set if you face issue with insufficient power on POE devices where the max power was set manually on the interface

2024-07-29: Article validated
2024-07-24 : Article Created