Hi
I was looking at an Airwave report that showed an AP was struggling with interference and had changed 2.4 GHz channels 179 times over a 24 hour period. I was trying to work out what would instigate a channel change and was told that an AP would change channels if it had an intf_idx(Total) of 25 or less than its existing channel. I have absolutely no reason to doubt this, I am just not sure how the calculation is made.
I can see that the AP last changed channels over five hours ago -
Interface :wifi1
ARM History
-----------
Time of Change Old Channel New Channel Old Power New Power Reason Result
-------------- ----------- ----------- --------- --------- ------ ------
2017-12-13 09:53:08 1 13 15 15 I Configured
2017-12-13 09:46:16 13 1 15 15 N Configured
And the AP has remanined on channel 13
From looking at the output of show ap arm rf-summary channels 1 and 5 have a far greater quality and noise floor but a small ammount of non 802.11 interference
Channel Summary
---------------
channel retry phy-err mac-err noise util(Qual) cov-idx(Total) intf_idx(Total)
1 0 0 0 94 8/7/0/0/99 8/0(8) 44/32//0/0(76)
5 0 0 0 90 4/4/0/0/100 13/0(13) 99/14//0/0(113)
13 0 0 0 76 1/1/0/0/72 5/0(5) 11/0//0/0(11)
Channel quality history:wifi1
1:Q: 99 99 99 99 99 99 99 99 99 98 98 98 98 98 98 99 99 99 99 99 99 99 99 98
:c: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
:N: 94 94 94 94 94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94 *94
:s: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
:U: 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 1 1 1 1 1 1 1 1 2
5:Q: 100 100 100 100 36 99 99 100 100 99 99 99 99 99 99 99 99 99 99 99 99 99 99 99
:c: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
:N: 90 90 90 90 90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90 *90
:s: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
:U: 0 0 0 0 0 1 1 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
13:Q: 72 72 72 72 72 72 72 72 72 72 72 69 69 69 69 69 69 69 69 69 69 75 75 75
:c: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
:N: *76 *76 *76 *76 *76 *76 *76 *76 *76 *76 *76 *75 *75 *75 *75 *75 *75 *75 *75 *75 *75 *75 *75 *77
:s: 28 28 28 28 28 28 28 28 28 28 28 31 31 31 31 31 31 31 31 31 31 31 31 25
:U: 0 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 1 20 20 0
:R: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
I am just curious as to why this AP has not changed channels further as it would seem to me (and I am no expert) that it has better alternatives.
Thank you,
Jonathan