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Occasional Contributor II

ARM: No Free Channels

On controller running 6.5.3.3 the ARM rf-summary shows no free channels. On another controller running 6.4.4.16 I can see 18 free 5Ghz channels and 2 free 2.4Ghz channels.

 

#show ap arm rf-summary ap-name AAP-W******02

Channel Summary
---------------
channel retry phy-err mac-err noise util(Qual) cov-idx(Total) intf_idx(Total)
------- ----- ------- ------- ----- ---------- -------------- ---------------
36 0 0 0 93 8/7/0/0/90 0/0(0) 6/0//0/0(6)
40 0 0 0 93 11/0/1/0/90 0/0(0) 1/2//0/0(3)
44 0 0 0 93 11/0/1/0/90 0/0(0) 0/0//0/0(0)
48 0 0 0 93 19/8/1/0/90 0/0(0) 1/0//0/0(1)
52 3 0 0 93 2/0/0/0/91 6/0(6) 0/0//0/0(0)
56 0 0 0 93 9/0/0/0/91 0/0(0) 0/0//0/0(0)
60 0 0 0 93 9/0/0/0/91 0/0(0) 0/0//0/0(0)
64 0 0 0 93 9/0/0/0/91 0/0(0) 0/0//0/0(0)
100 0 0 0 93 0/0/0/0/91 0/0(0) 0/0//0/0(0)
104 0 0 0 93 9/0/0/0/91 0/0(0) 0/0//0/0(0)
108 0 0 0 93 9/0/0/0/91 0/0(0) 0/0//0/0(0)
112 0 0 0 93 9/0/0/0/91 0/0(0) 0/0//0/0(0)
116 0 0 0 93 9/0/0/0/91 0/0(0) 12/8//0/0(20)
120 0 0 0 93 9/0/0/0/91 5/0(5) 25/0//0/0(25)
124 0 0 0 93 9/0/0/0/91 0/0(0) 0/8//0/0(8)
128 0 0 0 93 9/0/0/0/91 0/0(0) 0/0//0/0(0)
132 0 0 0 93 0/0/0/0/91 0/0(0) 0/0//0/0(0)
136 0 0 0 93 9/0/0/0/91 0/0(0) 0/0//0/0(0)
140 0 0 0 96 0/0/0/0/91 6/0(6) 0/0//0/0(0)
1 0 0 0 89 0/0/0/0/85 0/0(0) 4/2//5/1(12)
6 7 0 6 94 11/9/0/0/89 0/0(0) 13/4//4/1(22)
11 0 0 0 90 79/66/1/6/88 4/0(4) 27/0//4/1(32)

Columns:util(Qual): ch-util/rx/tx/ext-ch-util/quality
Noise followed by "*" indicates that the last scan on this channel was a split-scan, which was
triggered by high channel noise. Check show ap arm split-scan-history.

HT/VHT Channel Summary
----------------------
Bandwidth Channel range Total interference index
--------- ------------- ------------------------
40MHz 116-120 45
40MHz 52-56 0
40MHz 100-104 0
40MHz 124-128 8
40MHz 36-40 9
40MHz 60-64 0
40MHz 108-112 0
40MHz 132-136 0
40MHz 44-48 1

Interface Name :wifi0
Current ARM Assignment :52+/18.0
Covered channels a/g :18/0
Free channels a/g :0/0
ARM Edge State :enable
Last check channel/pwr :6m:52s/5m:2s
Last change channel/pwr :13m:13s/15m:1s
Next Check channel/pwr :40s/2m:16s
Assignment Mode :Single Band

Interface Name :wifi1
Current ARM Assignment :6/9.0
Covered channels a/g :0/3
Free channels a/g :0/0
ARM Edge State :enable
Last check channel/pwr :6m:44s/46s
Last change channel/pwr :4h:9m:2s/4h:9m:2s
Next Check channel/pwr :1m:5s/5m:44s
Assignment Mode :Single Band

 

Is this a known issue in this code revision or someother problem?

Guru Elite

Re: ARM: No Free Channels

That is a per-AP counter that determines how many channels have no APs on them as a possible destination.  It could vary depending on density and it potentially could be different for every AP on the same controller.


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Occasional Contributor II

Re: ARM: No Free Channels

I understand that the values could vary between different APs depending on the RF environment. What I don't understand is why in this case when so many channels have an interference index of 0 and high quality they aren't being counted as free channels. Is this what you would expect?

Guru Elite

Re: ARM: No Free Channels

It is possible that those channels have not been scanned enough times to determine that.

 

Have you seen the document here?  https://community.arubanetworks.com/aruba/attachments/aruba/unified-wired-wireless-access/7592/1/ARM%20Doc%20Supplement.pdf

It might not answer your question specifically, but it would give you an idea in general how ARM works.

 

 


*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Re: ARM: No Free Channels

@rossdrossd i also see the same, did you take this further and get it confirmed as a bug ?

Occasional Contributor II

Re: ARM: No Free Channels

@dugem2016 no I haven't progressed this. Colin's last suggestion was to wait longer but after 27 days the a/g free channels are still showing as 0/0. I'm less concerned as ARM has chosen sensible channels rather than them all being the same when I originally posted.

Re: ARM: No Free Channels

indeed too in my case arm is still choosing to move around when provoked to do so, but the free count should not be 0/0 as far as i can tell. 

Re: ARM: No Free Channels

What AP model is this and the regulatory domain set to for the AP? I've seen there where AP's haven't been supported in a regulatory domain.

 

Try the below to determine what channels are allowed in the country.

 

 show ap allowed-channels <country-code>


ACMP, ACSA, ACDX #985
If my post addresses your query, give kudos:)

Re: ARM: No Free Channels

@zalion, I think it's something other than the regdomain - i tested this on ap215, ap315, ap92, ap135 in a domain that is a first level regdomain

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