topic Re: wifi1 not running at manually selected power. in Aerohive Migrated Content

wifi1 not running at manually selected power.

olof — Wed, 09 Oct 2019 05:52:40 GMT

I have set my AP's to run at 17dBm power on wifi1.

However, some of them are only running at 14dBm and some at 12dBm.

As you can see from CLI output, ACSP is disabled.

show acsp

Interface Channel select state Primary channel Channel width Power ctrl state Tx power(dbm) Use Last Selection

--------- --------------------- ---------------- ------------- --------------------- ------------- ---------------------

Wifi0 Disable(Link down) Down 20 Disable(Link down) Down Channel:No Power:No

Wifi1 Disable(User disable) 56* 20 Disable(User disable) 12* Channel:No Power:No

Here is a sample output from show interface wifi1 on an AP with 17dBm shown in GUI.

```

show interface wifi1

AC=access category; be=best-effort; bg=background; vi=video; vo=voice;

AIFS=Arbitration Inter-Frame Space; Txoplimit=transmission opportunity limit;

IDP=Intrusion detection and prevention; BGSCAN=background scan; PS=Power save;

HT=High throughput; A-MPDU=Aggregate MAC protocol data unit;

DFS=Dynamic Frequency Selection; CU=Channel Utilization;

EIRP=Effective Isotropic Radiated Power (Transmit Power + Max Antenna Gain + Max TX Chains Gain);

Summary state=Good;

Mode=access; Radio disabled=no;

Admin state=enabled; Operational state=up;

MAC addr=d854:a216:1720; MTU=1500;

Freq(Chan)=5220Mhz(44*); EIRP power=22.77*dBm(12dBm + 6.00dBi + 4.77dBi); Diversity=enabled;

Tx range=300m; Noise floor=-95dBm; Tx power control=disabled;

....

Board limit=21dBm(1) 21dBm(2) 21dBm(3) -(4) ; Regulatory limit=17dBm(1) 14dBm(2) 12dBm(3) -(4) ;

```

and here is sample output from an AP with 12 dBm shown in GUI...

```

show interface wifi1

AC=access category; be=best-effort; bg=background; vi=video; vo=voice;

AIFS=Arbitration Inter-Frame Space; Txoplimit=transmission opportunity limit;

IDP=Intrusion detection and prevention; BGSCAN=background scan; PS=Power save;

HT=High throughput; A-MPDU=Aggregate MAC protocol data unit;

DFS=Dynamic Frequency Selection; CU=Channel Utilization;

EIRP=Effective Isotropic Radiated Power (Transmit Power + Max Antenna Gain + Max TX Chains Gain);

Summary state=High collision;

Mode=access; Radio disabled=no;

Admin state=enabled; Operational state=up;

MAC addr=d854:a216:1ca0; MTU=1500;

Freq(Chan)=5260Mhz(52*); EIRP power=22.77*dBm(12dBm + 6.00dBi + 4.77dBi); Diversity=enabled;

Tx range=300m; Noise floor=-95dBm; Tx power control=disabled;

...

Board limit=21dBm(1) 21dBm(2) 21dBm(3) -(4) ; Regulatory limit=17dBm(1) 14dBm(2) 12dBm(3) -(4) ;

```

Re: wifi1 not running at manually selected power.

olof — Wed, 09 Oct 2019 05:56:27 GMT

Why is EIRP showing the same dBm on both APs? Both are AP230 , on channel 44 and 52. Set to Norwegian country code.

Re: wifi1 not running at manually selected power.

olof — Wed, 09 Oct 2019 05:58:08 GMT

Re: wifi1 not running at manually selected power.

samantha_lynn — Thu, 10 Oct 2019 01:47:16 GMT

This is frequently due to a power imbalance, can you run the command "show lldp" without the quotations and let me know what the output says?

Re: wifi1 not running at manually selected power.

olof — Fri, 11 Oct 2019 19:09:47 GMT

I am getting the same values from both devices shown as 17 and 12 dBm output power.

All my devices are currently powered by POE injectors.

I didn't have this issue before moving these from one hivemanager to another.

show lldp

LLDP general information

----------------------------

Enabled: yes

Number of LLDP neighbors: 1

Max number of LLDP neighbors: 64

Sending LLDP packets interval (seconds): 30

Sending a holdtime value (seconds): 90

Sending a required power value (watt): 17.0

Re: wifi1 not running at manually selected power.

olof — Fri, 11 Oct 2019 19:49:00 GMT

As you can see from screenshot channel 52-64 have low power output. I changed them to channels 100-124 range.

Now they send at 17... Perhaps it has something to do with Norwegian regulatory domain?

Re: wifi1 not running at manually selected power.

bpowers — Mon, 14 Oct 2019 19:49:12 GMT

Olof,

Look further down the output of the show int wifi1 command for a "Board limit" line. This will show you two things. The max limit of the device AND the max limit of the current channel based on the country code set on the AP. These limits will vary per UNII band per region. For country code 840, I get three different values for three different UNII bands.

========================================================

Host Name : ap1

========================================================

show int wifi1 | I board

========================================================

Board limit= 19dBm(1) 19dBm(2) 19dBm(3) 19dBm(4); Regulatory limit= 24dBm(1) 23dBm(2) 22dBm(3) -(4);

========================================================

Host Name : ap2

========================================================

show int wifi1 | I board

========================================================

Board limit= 21dBm(1) 21dBm(2) 21dBm(3) 21dBm(4); Regulatory limit= 23dBm(1) 22dBm(2) 20dBm(3) -(4);

========================================================

Host Name : ap3

========================================================

show int wifi1 | I board

========================================================

Board limit= 21dBm(1) 21dBm(2) 21dBm(3) 21dBm(4); Regulatory limit= 19dBm(1) 18dBm(2) 18dBm(3) -(4);

========================================================

So regardless what you try to manually set the power to, the AP will not let you override the predefined settings regulated by your governing body. So they try to keep you legal! 🙂

Re: wifi1 not running at manually selected power.

reinhardg — Wed, 16 Oct 2019 15:59:24 GMT

Why are there 4 values for board limit and regulatory limit? What does that mean?

Re: wifi1 not running at manually selected power.

rickywong — Wed, 16 Oct 2019 17:00:48 GMT

Hello Sir, Not all AP support up 20 as maximum power.

You need to check out the datasheet of that AP to confirm the maximum power.

Re: wifi1 not running at manually selected power.

rickywong — Wed, 16 Oct 2019 17:01:38 GMT

When the AP boot up, using console cable and you can find the related message also.

Re: wifi1 not running at manually selected power.

bpowers — Wed, 16 Oct 2019 18:23:03 GMT

The four values would be for a 4x4:4 device with four spatial streams. In the AP230 case, the 4th value is null as there's no value. Basically the AP subtracts ~1.77 dB of power per spatial stream to stay within regulatory limits.

You can see this because of the actual gain per antenna here:

Freq(Chan)=5220Mhz(44*); EIRP power=22.77*dBm(12dBm + 6.00dBi + 4.77dBi); Diversity=enabled;

This 4.77dBi gain is offset by the reduction in the max output power to keep things in balance. You can see these values change if you set the radio to only operate at 1 or 2 spatial streams vs. the default of 3.

Re: wifi1 not running at manually selected power.

olof — Wed, 16 Oct 2019 18:27:23 GMT

Thanks, how can I see what maximum power is on AC? This documents only mentions transmit power on 802.11g...

https://www.aerohive.com/wp-content/uploads/Aerohive_Datasheet_AP122.pdf

Re: wifi1 not running at manually selected power.

bpowers — Wed, 16 Oct 2019 18:44:32 GMT

The data sheet shows it per frequency.

Max EIRP (dBm):

2400 MHz to 2500 MHz: 27 dBm

5250 MHz to 5350 MHz: 30 dBm

5725 MHz to 5875 MHz :30 dBm

Not per 802.11 technology (a/b/g/n/ac). So it matters not if the AP is .11g only or .11ac or if the radio profile is configured as such. The max limits are per frequency range based on the regulatory body (country code applied to the hardware).

Re: wifi1 not running at manually selected power.

reinhardg — Wed, 16 Oct 2019 19:01:29 GMT

Thank you for the good explanation.

Re: wifi1 not running at manually selected power.

olof — Thu, 24 Oct 2019 18:42:59 GMT

@Brian Powers Hope your great powers can help with this power output confusion... So I suppose the Regulatory limit means at *the current channel* ?

My AP122 current channel set to 36

AP122#show run | i "wifi1 radio channel"

interface wifi1 radio channel 36

On AP122 I am allowed to max use 14dBm with 2 spatial streams?

AP122# show interface wifi1 | i board

Board limit=19dBm(1) 19dBm(2) -(3) -(4); Regulatory limit=19dBm(1) 14dBm(2) -(3) -(4);

Ok what if I change to channel 104? Does that allow me to up the regulatory limit?

AP122# interface wifi1 radio channel 104

AP122# show interface wifi1 | i board

Board limit=19dBm(1) 19dBm(2) -(3) -(4); Regulatory limit=20dBm(1) 15dBm(2) -(3) -(4);

Right, so one more dBm on channel 104 is allowed, great.

Checking on another AP230 that is currently set to channel 104.

AP230# show run | i "wifi1 radio channel"

interface wifi1 radio channel 104

AP230#show interface wifi1 | i Board

Board limit=21dBm(1) 21dBm(2) 21dBm(3) -(4); Regulatory limit=25dBm(1) 22dBm(2) 20dBm(3) -(4);

Now this confuses me as the AP230 has higher regulatory limit than my AP122.

Same channel, same channel width, same country code.

AP122/AP230#show boot-param | i Country

Country Code: 578

Re: wifi1 not running at manually selected power.

bpowers — Fri, 25 Oct 2019 22:04:25 GMT

To my knowledge, you are correct. The regulatory limit should be based off of the frequency. Are these two APs running the same HiveOS? I imagine this could impact those values. The 2x2:2 AP vs. 3x3:3 AP I guess could as well. But someone from Aerohive would have to speak on the matter to know for sure.

Re: wifi1 not running at manually selected power.

olof — Mon, 28 Oct 2019 15:39:59 GMT

I just downgraded from 10.0r7a to 8.2.r4.

It seems like the power is going up. Although I have not been onsite to actually confirm sending power has gone up.

Power now shows 19dBm. But the reulatory limit doesn't specify spatial streams. Power in GUI shows 19dBm.

AP122#show int wifi1 | i Board

OFDM 20Mhz power: Board limit=19dBm; Regulatory limit=19dBm;

AP122#show int wifi1 | i "Freq(Chan)"

Freq(Chan)=5180Mhz(36*); EIRP power=28.01*dBm(19dBm + 6.00dBi + 3.01dBi); Diversity=enabled;