WLC Configure antenna gain

[bravee]

Hello,
I wonder what effect changing the external antenna gain has on the access points? Can the change be made in production or do they need to reboot or similar?

I don't have much experience in Cisco wireless, hope someone can help me.

Thanks in advance

[balaji.bandi]

As per  i know you do not need to reboot, but you are cautious always do in the maintenance window.

[marce1000]

 - FYI : https://www.cisco.com/c/en/us/td/docs/wireless/outdoor_industrial/iw9167/hardware/installation/m-cisco-ultra-reliable-wireless-backhaul-catalyst-iw9167e-heavy-duty-access-points-software-configuration-guide/m-configuring-radio-antenna-settings.html#c...

                                             Reboot is not needed ,

 M.

[RxTx]

From my work experience with 2702E:

AP will not be rebooted.

AP will reset the radio interface where you change Antenna Gain value, and as result all clients from that AP on that radio interface will be disconnected. 

[JPavonM]

The effect by adding antenna gain is that the Max TX Power available on the radio interfaces must be adapted to be compliant with he regulatory domain. As some gain is added, and the Max EIRP must be obeyed, the Max TX Power available for every power level should be lowered, and that requires the radio slot to be reset hence impacting connected clients.

[bravee]

Just to clarify, it only affects the access point I'm reconfiguring, not all access points connected to the controller?

[RxTx]

Yes only the AP you config.

[RxTx]

Pay attention at value you have to enter in gui:

from my understanding it is 2x Antenna Gain value ( because the step it is 0.5dBi) so for 4 dBi antenna gain you have to enter value 8 because 8 x 0.5 =4 dBi

[bravee]

Thanks for all the helpful replies!
RRM > Tx Power Control
Is it 20 dBm - 13 dBm gain = 7 dBm max
Or do you set the maximum value to, for example, 20 dBm and the algorithm calculates the appropriate power level with antenna gain included?