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kanes39
kanes39
New Member
May 11, 2023
Solved

DARRP Wireless

  • May 11, 2023
  • 4 replies
  • 14856 views

Hi All,

 

I am in need of some expert advise on this after exhausting Forti TAC support.

 

Details:
FW: 7.2.4
AP: 7.0 Build 0031 (latest).

H/W: U231F

Problem: The AP's are all using the same channels and because of that when users are roaming they get disconnected and I have to either reboot them or put them into a different AP profile and limit the channels they can use so that each AP uses different channels - this is particularly for 5Ghz.

I don't understand why even with RRP - Enabled and DFC channels selected the APs are selecting the same channel and I can confirm the AP signals are overlapping so why is the AP not smart enough to move the AP's to different channels?

Can someone please guide me on what am I missing here and Forti-TAC's suggestion is to create an individual profile for each AP and enable RRP but limit the channels or make sure they don't overlap.

 

Your help is much appreciated.

 

Wireless Controller,  #firewal

 

 

Best answer by kanes39

Hi Graham,

 

Thank you very much for your assistance and the command that you shared.

I was able to prove from that command that the DARRP was not working at all because it had no values on the RSSI and Inteferences.

Its all fixed now with the help of an engineering version Forti OS.

Thanks again for all your help.

4 replies

gfleming
Staff
gfleming
Staff
May 11, 2023

How many APs do you have?

What is your DARRP profile look like?

What is your AP Profile look like?

How are you confirming the APs can hear each other? They need to hear each other for DARRP to be effective.

kanes39
kanes39Author
New Member
May 12, 2023

Hi Graham,

 

This particular site has below setup:

a) 3 APS
b) The DARRP profile has the standard settings except the DFS and weather enabled.

c) On the AP Profile:
     AP Handoff is unchecked, RRP enabled, Transmit Power set to Percent and at 100%, Monitor Channel utilization enabled, Channel width set to 40Mhz.

We can confirm the AP's can hear each other because we did see it via the Wi-Fi analyzer and at any time this 2 AP's are on the same channel it cannot do roaming.


gfleming
Staff
gfleming
Staff
May 12, 2023

OK first of all yes maybe something is wrong with DARRP if your APs are all on the same channel. However, you almost certainly do not want your APs broadcasting a 100% power and this is most likely the primary cause of your client issues.

 

You need to understand that an AP transmits at a much higher power than almost every device out there. 

 

The best thing to do is set your AP using dBm and set it between 10-15dBm considering the fact that most mobile phones transmit at 10dBm and laptops at 15dBm (maximum).

 

there's no point having your AP yelling at 23dBm and having your devices hear it but not be able to speak to it. Just because your devices see a good signal doesn't mean your AP sees one from them.

 

Likewise, an AP transmitting at such high power will cause a device to think it has no reason to roam. 

 

Best practice is to reduce transmission power of the AP. Next up if you really want to is limit the data rates so clients will only connect at a set minimum data rate as this prevents devices holding on to an AP with low data transmission rates. Forces them off to look for a better AP.

 

This all assumes you have a valid and complete site survey for your environment and you are sure you have proper penetration for your APs.

 

Next on to your DARRP stuff, are you using a Wi-Fi analyzer on a laptop? Just because a laptop can see/hear two APs doesn't mean the two APs can hear each other....

kanes39
kanes39Author
New Member
May 15, 2023

Really looking forward for some help as the AP's are performing terribly on the following:

a) Roaming
b) Darrp (according To TAC).

 

kanes39
kanes39Author
New Member
May 15, 2023

I am also getting the following errors on the particular AP-02:

Association denied because AP unable to handle additional associated stations.


Wireless client authenticates through OKC failed with no match

gfleming
Staff
gfleming
Staff
May 15, 2023

How many clients are associated to AP-02? Do you have limits configured?

 

Have you tried factory resetting the AP?

kanes39
kanes39AuthorAnswer
New Member
May 17, 2023

Hi Graham,

 

Thank you very much for your assistance and the command that you shared.

I was able to prove from that command that the DARRP was not working at all because it had no values on the RSSI and Inteferences.

Its all fixed now with the help of an engineering version Forti OS.

Thanks again for all your help.

irixis
irixis
New Member
March 18, 2025

Hello! Nice to meet you.

 

I'm having the same problems you described in this thread. Could you please tell me what your final solution was?

 

Thank you very much.

 

kanes39
kanes39Author
New Member
March 26, 2025

Hi @irixis,

 

I did go through a lot of changes in the environment to fix this issue.

However the good news is that there is a fix for this issue on the latest firmware for the AP.

The current firmware we are using would be 7.0 build0146.

Other things that I did to stabilize the wireless network:

 

1. Disabled AX band.

2. Enabled Frequency handoff and AP handoff.

3. Disabled WIDS.

4. Disabled 2.4Ghz for SSID's that does not have any old devices.

5. Reduced the power for the 2.4Ghz as that was causing some issues.

6. Updated Transmit power for 5Ghz.

7. Updated channel width from 40 to 20mhz.
8 We had 12 AP's and we create 2 AP profiles with 6 AP's in each profiles. Statically assigned different channels to this 2 groups.

 

I did many more but really can only recall this things.

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