Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Non wifi interference

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

12 REPLIES

Select the Avoid Persistent

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.

New Member

Hi ;   This topic is quite

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

New Member

I too have a massive problem

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?

New Member

Hi team ;                    

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.

New Member

hi Sreejith,your conclusion

hi Sreejith,

your conclusion and what Megasmithers concludes are contradicting..

 

Any further findings on this ?

New Member

My only conclusion is that

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

New Member

Being the Cisco Support Forum

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

 

 

Indeed confusing.

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?

Totally agree with

Totally agree with Megasmithers.

This is very confusing.

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

Please select  Avoid

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

New Member

Re: Please select  Avoid

"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,

J

New Member

Re: Please select  Avoid

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"?

367
Views
20
Helpful
12
Replies