Wireless Access

Does anybody know how channel quality is calculated in regard to interfence index? I do not understand this when running show ap arm rf-summary.

I have the following rf-summary table:

Channel Summary
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phy-type  channel  retry  phy-err  mac-err  noise  util(Qual)    cov-idx(Total)  intf_idx(Total)
--------  -------  -----  -------  -------  -----  ----------    --------------  ---------------
5GHz      36       0      0        0        92     4/4/0/0/100   5/0(5)          39/0//0/0(39)
5GHz      40       0      0        0        92     0/0/0/0/100   0/0(0)          19/29//0/0(48)
5GHz      44       7      0        0        94     7/5/1/0/99    14/0(14)        49/0//0/0(49)
5GHz      48       0      0        0        92     0/0/0/0/100   0/0(0)          24/19//0/0(43)
5GHz      52       0      0        0        92     0/0/0/0/100   0/0(0)          8/0//0/0(8)
5GHz      56       0      0        0        92     0/0/0/0/100   0/0(0)          4/23//0/0(27)
5GHz      60       0      0        0        92     4/4/0/0/100   12/0(12)        61/0//0/0(61)
5GHz      64       0      0        0        92     1/1/0/0/100   0/0(0)          12/20//0/0(32)
5GHz      100      0      0        0        92     0/0/0/0/100   0/0(0)          0/0//0/0(0)
5GHz      104      0      0        0        92     0/0/0/0/100   0/0(0)          0/2//0/0(2)
5GHz      108      0      0        0        92     0/0/0/0/100   0/0(0)          7/0//0/0(7)
5GHz      112      0      0        0        92     0/0/0/0/100   0/0(0)          4/2//0/0(6)
5GHz      116      0      0        0        92     7/7/0/0/100   0/0(0)          2/0//0/0(2)
5GHz      120      0      0        0        92     0/0/0/0/100   0/0(0)          0/0//0/0(0)
5GHz      124      0      0        0        92     0/0/0/0/100   0/0(0)          0/0//0/0(0)
5GHz      128      0      0        0        92     0/0/0/0/100   0/0(0)          0/8//0/0(8)
5GHz      132      0      0        0        92     0/0/0/0/100   4/0(4)          24/0//0/0(24)
5GHz      136      0      0        0        92     0/0/0/0/100   0/0(0)          12/8//0/0(20)
5GHz      140      0      0        0        92     0/0/0/0/100   0/0(0)          0/0//0/0(0)

I can see that the channel pair 44-48 is OK according to util(Qual), but at the same time it has the highest intf_idx(Total). The AP always chooses 44+ as its 5GHz channel, likely because of the relatively low noise level on ch. 44.

So what exactly does Interference index mean? Is 49/0//0/0(49) a lot or is this something I need not worry about? And how does this correspond to channel quality?

I have read the description at https://www.arubanetworks.com/techdocs/CLI-Bank/Content/instant/sh-ap-arm.htm, but it does not make things clear at all.

I found some info on channel quality here (external source).

These metrics change all the time, and ARM will not immediately move to another channel if that seems only 'just better', there needs to be a significant improvement to avoid constant channel changing. Also the algorithms have changed over time, and may be slightly different for Instant, Controllers, Mobility Conductor and Aruba Central managed APs (in simple to most advanced order).

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Herman Robers
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If you have urgent issues, always contact your Aruba partner, distributor, or Aruba TAC Support. Check https://www.arubanetworks.com/support-services/contact-support/ for how to contact Aruba TAC. Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.

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