topic Please select Avoid in Wireless

Non wifi interference

sreejith_r — Mon, 05 Jul 2021 07:43:18 GMT

Do we need to enable the avoid persistent non wifi interference check box to include the non wifi interference in the DCA calculation

Select the Avoid Persistent

Saurav Lodh — Tue, 22 Apr 2014 09:26:41 GMT

Select the Avoid Persistent Non-WiFi Interference check box to enable the Cisco WLC to ignore persistent non-WiFi interference.

Non-wifi interference are non 802.11 devices. These devices include microwave ovens, cordless phones, Bluetooth devices, wireless video cameras, outdoor microwave links, wireless game controllers, Zigbee devices, fluorescent lights, WiMAX, and so on. Even bad electrical connections can cause broad RF spectrum emissions. These non-802.11 types of interference typically don't work cooperatively with 802.11 devices, and can cause significant loss of throughput. In addition, they can cause secondary effects such as rate back-off, in which retransmissions caused by interference trick the 802.11 devices into thinking that they should use lower data rates than appropriate.

Hi ; This topic is quite

sreejith_r — Tue, 22 Apr 2014 10:06:35 GMT

Hi ;

This topic is quite confusing with the words

Step 6 Select the Avoid Foreign AP Interference check box to cause the controller's RRM algorithms to consider 802.11 traffic from foreign access points (those not included in your wireless network) when assigning channels to lightweight access points, or unselect it to disable this feature. For example, RRM may adjust the channel assignment to have access points avoid channels close to foreign access points. The default value is selected.

Step 7 Select the Avoid Cisco AP Load check box to cause the controller's RRM algorithms to consider 802.11 traffic from Cisco lightweight access points in your wireless network when assigning channels, or unselect it to disable this feature. For example, RRM can assign better reuse patterns to access points that carry a heavier traffic load. The default value is unselected.

Step 8 Select the Avoid Non-802.11a (802.11b) Noise check box to cause the controller's RRM algorithms to consider noise (non-802.11 traffic) in the channel when assigning channels to lightweight access points, or unselect it to disable this feature. For example, RRM may have access points avoid channels with significant interference from nonaccess point sources, such as microwave ovens. The default value is selected.

Step 9 Select the Avoid Persistent Non-WiFi Interference check box to enable the controller to ignore persistent non-WiFi interference.

these statements are contradicting each other

I too have a massive problem

Mark Withers — Thu, 19 Jun 2014 20:38:36 GMT

I too have a massive problem resolving the documentation.

"Avoid Persistent Non-WiFi Interference: DCA parameter that you can enable to allow the Cisco WLC to ignore persistent non-WiFi interference. " Source: Help file built into WLC.

"Step 9 Select the Avoid Persistent Non-WiFi Interference check box to enable the Cisco WLC to ignore persistent non-WiFi interference." Source: http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/b_cg74_CONSOLIDATED/b_cg74_CONSOLIDATED_chapter_010000011.html

These just do not make any sense. Is the DOCUMENTATION backwards, or is the INTERFACE backwards? Or is the ALGORITHM backwards?

Hi team ;

sreejith_r — Mon, 23 Jun 2014 21:34:58 GMT

Hi team ;

We need to select the Avoid Persistent Non-WiFi Interference check box to enable the Cisco WLC to calculate persistent non-WiFi interference for the DCA calculation.

Totally agree with

ericgarnel — Wed, 02 Jul 2014 13:40:14 GMT

Totally agree with Megasmithers.

This is very confusing.

Maybe the box should say "yes" or "no"

Please select Avoid

Abhishek Abhishek — Thu, 17 Jul 2014 01:22:58 GMT

Please select Avoid Persistent Non-WiFi Interference check box to enable the Cisco WLC to ignore persistent non-WiFi interference.

hi Sreejith,your conclusion

Mohamed Shafeer Kunhu — Sat, 11 Oct 2014 20:42:22 GMT

hi Sreejith,

your conclusion and what Megasmithers concludes are contradicting..

Any further findings on this ?

My only conclusion is that

Mark Withers — Sun, 12 Oct 2014 02:14:07 GMT

My only conclusion is that the documentation and the interface are contradictory.

Being the Cisco Support Forum

Mohamed Shafeer Kunhu — Sun, 12 Oct 2014 08:20:14 GMT

Being the Cisco Support Forum, don't we have any final confirmation from Cisco regarding this ?

Indeed confusing.

davy.timmermans — Thu, 10 Mar 2016 20:29:39 GMT

Indeed confusing.

Avoid Persistent Non-Wifi Interference: X Enabled

=> Meaning:

take measured persistent non-wifi interference into account during DCA calculations? Try to bypass interference

Bis

what's the difference between non-wifi interference and non-802.11a noise?

Re: Please select Avoid

J. H. — Wed, 30 Aug 2017 09:34:51 GMT

"Avoid Foreign AP interference"

I want DCA to avoid interference from Foreign APs, ie I want the WLC to select channels that are not being used by other AP's.

So what is the correct setting for "Avoid Foreign AP interference", checked or not checked box?

Regards,

Re: Please select Avoid

J. H. — Wed, 30 Aug 2017 09:39:03 GMT

This explanation from the manual is not clear at all.
Ignore as in "do not let the algorithm take Persistent Non-WiFi Interference into account" or "let the algorithm avoid Persistent Non-WiFi Interference to select a better channel"?

Re: Please select Avoid

steiostb1 — Tue, 02 Jul 2019 09:33:32 GMT

Can somebody please confirm this? Will checking 'Avoid Persistent Non-WiFi Interference' make the DCA to take into consideration the Persistent Non-WiFi Interference?

Re: Please select Avoid

patoberli — Wed, 03 Jul 2019 14:31:41 GMT

Based on the description in the manual it's exactly the opposite:
https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-5/config-guide/b_cg85/radio_resource_management.html#ID351

Re: Please select Avoid

vsinharockwell — Mon, 15 Jul 2019 07:29:21 GMT

i am also struggling to understand this.

As per TAC, we need to select the checkbox if we want our controller to consider the interference from foreign access point and select a different channel during DCA calculation.

Re: Please select Avoid

steiostb1 — Mon, 05 Aug 2019 11:56:41 GMT

That is contradictory to what Cisco says in the documentation:

'Select the Avoid Persistent Non-WiFi Interference check box to enable the Cisco WLC to ignore persistent non-WiFi interference.'

Does 'ignore' mean that the Cisco WLC take non-WIFI interference into consideration?

Re: Please select Avoid

patoberli — Tue, 01 Jun 2021 09:10:48 GMT

It's been a while and I'm still confused 😄

Anyway, in version 8.10 documentation, they changed the phrasing:

Check the Avoid Persistent Non-WiFi Interference check box to configure the controller to stop ignoring persistent non-Wi-Fi interference in new channel calculation. The persistent non-Wi-Fi interference is considered during the metric calculation for channels.

https://www.cisco.com/c/en/us/td/docs/wireless/controller/8-10/config-guide/b_cg810/radio_resource_management.html

So at least in 8.10 this checkbox should be enabled if you have a lot of Non-WiFi interference and want DCA to select a better channel.

Re: Non wifi interference

Kasper Roholt — Tue, 11 Feb 2025 09:15:53 GMT

From 17.15. Guide: https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-15/config-guide/b_wl_17_15_cg/m_rrm_c9800.html
Check the Avoid Foreign AP Interference check box to cause the device’s RRM algorithms to consider 802.11 traffic from foreign APs (those not included in your wireless network) when assigning channels to lightweight APs, or uncheck it to disable this feature. For example, RRM may adjust the channel assignment to have access points avoid channels close to foreign APs. By default, this feature is in enabled state.