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Tx Control Power

The RF transmit power is changing every time the algorithm runs, is it normal or should it be steady?

This is happening in a network with a 2504 Controller and almost 60 APs.

6 REPLIES 6
Rasika Nayanajith
VIP Mentor

It should be relatively steady if RF environment is good. How frequently is it changing? By default DCA interval is 10min, I would increase that to 6-8 hrs to minimize frequent changes.

 

You can post "show advanced 802.11a summary" and "show advanced 802.11b summary" output before and after a change occur.

 

HTH

Rasika

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Hi, thanks for responding:

Here is the output, as well, I noticed that APs that are changing their Tx Power are the same, I mean, algorithm runs then they change, then the algorithm runs again and the AP comes back to the original value.. and they are swapping  almost every time the algorithm runs.

I'm focusing in the 2.4 band since in the 5 GHz just 1 AP is changing:

The APs that are changing are: AP50, 60, 57, 28, 51, 9 and 41

 

AP Name MAC Address Admin Oper Channel TxPower
-------------------------------- ----------------- -------- ----------- ---------- -------------
AP1 f4:0f:1b:ac:f4:e0 ENABLED UP 6* *3/8 (17 dBm)
AP26 f4:0f:1b:bb:0e:90 ENABLED UP 6* *8/8 ( 2 dBm)
AP59 bc:16:f5:1b:ce:60 ENABLED UP 11* *5/5 (13 dBm)
AP54 58:97:bd:cf:5c:10 ENABLED UP 1* *4/8 (14 dBm)
AP32 e0:89:9d:ff:5b:40 ENABLED UP 11* *5/5 (13 dBm)
AP50 64:f6:9d:75:02:40 ENABLED UP 1* *6/8 ( 8 dBm)
AP20 c4:0a:cb:68:de:40 ENABLED UP 1* *5/5 (13 dBm)
AP48 c4:0a:cb:69:15:20 ENABLED UP 1* *5/5 (13 dBm)
AP21 0c:85:25:34:d7:60 ENABLED UP 11* *5/5 (13 dBm)
AP52 58:97:bd:da:c6:90 ENABLED UP 6* *5/8 (11 dBm)
AP16 c4:0a:cb:69:19:a0 ENABLED UP 11* *5/5 (13 dBm)
AP10 68:86:a7:29:5a:a0 ENABLED UP 1* *5/5 (13 dBm)
AP43 b8:62:1f:3b:e7:e0 ENABLED UP 1* *5/5 (13 dBm)
AP22 84:78:ac:e9:af:00 ENABLED UP 6* *5/5 (13 dBm)
AP33 1c:1d:86:34:24:e0 ENABLED UP 6* *5/5 (13 dBm)
AP35 bc:16:f5:1a:70:80 ENABLED UP 11* *5/5 (13 dBm)
AP39 f4:0f:1b:a6:ab:00 ENABLED UP 11* *8/8 ( 2 dBm)
AP60 bc:16:f5:1a:91:80 ENABLED UP 11* *4/5 (16 dBm)
AP34 74:26:ac:ce:14:a0 ENABLED UP 1* *8/8 ( 1 dBm)
AP15 bc:16:f5:1a:72:80 ENABLED UP 11* *5/5 (13 dBm)
AP37 ec:bd:1d:f7:72:c0 ENABLED UP 1* *8/8 ( 2 dBm)
AP42 c8:f9:f9:61:9e:e0 ENABLED UP 11* *5/5 (13 dBm)
AP44 68:86:a7:28:7c:00 ENABLED UP 11* *5/5 (13 dBm)
AP45 58:bf:ea:01:02:80 ENABLED UP 6* *5/5 (13 dBm)
AP29 78:ba:f9:e6:d3:30 ENABLED UP 1* *5/8 (11 dBm)
AP27 d0:72:dc:5c:0d:a0 ENABLED UP 1* *8/8 ( 2 dBm)
AP56 20:bb:c0:64:9a:c0 ENABLED UP 11* *1/8 (20 dBm)
AP4 f8:c2:88:14:c0:60 ENABLED UP 11* *1/8 (23 dBm)
AP3 04:62:73:db:61:f0 ENABLED UP 6* *3/8 (17 dBm)
AP62 bc:16:f5:1a:1b:e0 ENABLED UP 11* *5/5 (13 dBm)
AP57 58:97:bd:10:f6:b0 ENABLED UP 11* *6/8 ( 8 dBm)
AP38 74:26:ac:cf:73:30 ENABLED UP 6* *8/8 ( 2 dBm)
AP2 f4:0f:1b:ff:a9:40 ENABLED UP 1* *3/8 (17 dBm)
AP28 74:26:ac:b7:52:30 ENABLED UP 11* *5/8 (11 dBm)
AP40 f4:0f:1b:a6:9f:70 ENABLED UP 6* *8/8 ( 2 dBm)
AP36 88:75:56:db:cb:f0 ENABLED UP 6* *8/8 (-1 dBm)
AP51 58:97:bd:0c:fd:e0 ENABLED UP 6* *6/8 ( 8 dBm)
AP17 0c:85:25:35:36:20 ENABLED UP 11* *5/5 (13 dBm)
AP46 c8:f9:f9:61:73:00 ENABLED UP 11* *5/5 (13 dBm)
AP47 68:86:a7:29:44:e0 ENABLED UP 11* *5/5 (13 dBm)
AP19 c4:0a:cb:68:bf:80 ENABLED UP 1* *5/5 (13 dBm)
AP23 54:78:1a:0d:e0:00 ENABLED UP 11* *5/5 (13 dBm)
AP12 c8:f9:f9:60:27:00 ENABLED UP 6* *5/5 (13 dBm)
AP49 c4:0a:cb:68:de:a0 ENABLED UP 1* *5/5 (13 dBm)
AP30 d0:72:dc:5e:8e:e0 ENABLED UP 11* *6/8 ( 8 dBm)
AP13 dc:a5:f4:05:81:00 ENABLED UP 11* *5/5 (13 dBm)
AP53 10:bd:18:ea:de:a0 ENABLED UP 11* *3/8 (14 dBm)
AP25 c4:0a:cb:68:bf:e0 ENABLED UP 11* *5/5 (13 dBm)
AP14 dc:a5:f4:05:88:c0 ENABLED UP 11* *5/5 (13 dBm)
AP11 f0:29:29:c3:ac:60 ENABLED UP 11* *5/5 (13 dBm)
AP61 bc:16:f5:1a:81:00 ENABLED UP 11* *5/5 (13 dBm)
AP31 f4:0f:1b:54:de:b0 ENABLED UP 1* *8/8 ( 2 dBm)
AP8 d0:72:dc:5e:8d:a0 ENABLED UP 11* *8/8 ( 2 dBm)
AP7 d0:72:dc:3a:f8:50 ENABLED UP 6* *8/8 ( 2 dBm)
AP6 20:3a:07:99:c8:c0 ENABLED UP 1* *5/5 (13 dBm)
AP5 50:1c:bf:48:d4:c0 ENABLED UP 11* *5/5 (13 dBm)
AP9 74:26:ac:ce:0d:b0 ENABLED UP 1* *8/8 ( 2 dBm)
AP41 40:a6:e8:77:9c:a0 ENABLED UP 11* *4/5 (16 dBm)
AP18 1c:de:a7:df:4b:40 ENABLED UP 11* *5/5 (13 dBm)

 

 

AP Name MAC Address Admin Oper Channel TxPower
-------------------------------- ----------------- -------- ----------- ---------- -------------
AP1 f4:0f:1b:ac:f4:e0 ENABLED UP 6* *3/8 (17 dBm)
AP26 f4:0f:1b:bb:0e:90 ENABLED UP 6* *8/8 ( 2 dBm)
AP59 bc:16:f5:1b:ce:60 ENABLED UP 11* *5/5 (13 dBm)
AP54 58:97:bd:cf:5c:10 ENABLED UP 1* *4/8 (14 dBm)
AP32 e0:89:9d:ff:5b:40 ENABLED UP 11* *5/5 (13 dBm)
AP50 64:f6:9d:75:02:40 ENABLED UP 1* *7/8 ( 5 dBm)
AP20 c4:0a:cb:68:de:40 ENABLED UP 1* *5/5 (13 dBm)
AP48 c4:0a:cb:69:15:20 ENABLED UP 1* *5/5 (13 dBm)
AP21 0c:85:25:34:d7:60 ENABLED UP 11* *5/5 (13 dBm)
AP52 58:97:bd:da:c6:90 ENABLED UP 6* *5/8 (11 dBm)
AP16 c4:0a:cb:69:19:a0 ENABLED UP 11* *5/5 (13 dBm)
AP10 68:86:a7:29:5a:a0 ENABLED UP 1* *5/5 (13 dBm)
AP43 b8:62:1f:3b:e7:e0 ENABLED UP 1* *5/5 (13 dBm)
AP22 84:78:ac:e9:af:00 ENABLED UP 6* *5/5 (13 dBm)
AP33 1c:1d:86:34:24:e0 ENABLED UP 6* *5/5 (13 dBm)
AP35 bc:16:f5:1a:70:80 ENABLED UP 11* *5/5 (13 dBm)
AP39 f4:0f:1b:a6:ab:00 ENABLED UP 11* *8/8 ( 2 dBm)
AP60 bc:16:f5:1a:91:80 ENABLED UP 11* *5/5 (13 dBm)
AP34 74:26:ac:ce:14:a0 ENABLED UP 1* *8/8 ( 1 dBm)
AP15 bc:16:f5:1a:72:80 ENABLED UP 11* *5/5 (13 dBm)
AP37 ec:bd:1d:f7:72:c0 ENABLED UP 1* *8/8 ( 2 dBm)
AP42 c8:f9:f9:61:9e:e0 ENABLED UP 11* *5/5 (13 dBm)
AP44 68:86:a7:28:7c:00 ENABLED UP 11* *5/5 (13 dBm)
AP45 58:bf:ea:01:02:80 ENABLED UP 6* *5/5 (13 dBm)
AP29 78:ba:f9:e6:d3:30 ENABLED UP 1* *5/8 (11 dBm)
AP27 d0:72:dc:5c:0d:a0 ENABLED UP 1* *8/8 ( 2 dBm)
AP56 20:bb:c0:64:9a:c0 ENABLED UP 11* *1/8 (20 dBm)
AP4 f8:c2:88:14:c0:60 ENABLED UP 11* *1/8 (23 dBm)
AP3 04:62:73:db:61:f0 ENABLED UP 6* *3/8 (17 dBm)
AP62 bc:16:f5:1a:1b:e0 ENABLED UP 11* *5/5 (13 dBm)
AP57 58:97:bd:10:f6:b0 ENABLED UP 11* *7/8 ( 5 dBm)
AP38 74:26:ac:cf:73:30 ENABLED UP 6* *8/8 ( 2 dBm)
AP2 f4:0f:1b:ff:a9:40 ENABLED UP 1* *3/8 (17 dBm)
AP28 74:26:ac:b7:52:30 ENABLED UP 11* *4/8 (14 dBm)
AP40 f4:0f:1b:a6:9f:70 ENABLED UP 6* *8/8 ( 2 dBm)
AP36 88:75:56:db:cb:f0 ENABLED UP 6* *8/8 (-1 dBm)
AP51 58:97:bd:0c:fd:e0 ENABLED UP 6* *7/8 ( 5 dBm)
AP17 0c:85:25:35:36:20 ENABLED UP 11* *5/5 (13 dBm)
AP46 c8:f9:f9:61:73:00 ENABLED UP 11* *5/5 (13 dBm)
AP47 68:86:a7:29:44:e0 ENABLED UP 11* *5/5 (13 dBm)
AP19 c4:0a:cb:68:bf:80 ENABLED UP 1* *5/5 (13 dBm)
AP23 54:78:1a:0d:e0:00 ENABLED UP 11* *5/5 (13 dBm)
AP12 c8:f9:f9:60:27:00 ENABLED UP 6* *5/5 (13 dBm)
AP49 c4:0a:cb:68:de:a0 ENABLED UP 1* *5/5 (13 dBm)
AP30 d0:72:dc:5e:8e:e0 ENABLED UP 11* *6/8 ( 8 dBm)
AP13 dc:a5:f4:05:81:00 ENABLED UP 11* *5/5 (13 dBm)
AP53 10:bd:18:ea:de:a0 ENABLED UP 11* *3/8 (14 dBm)
AP25 c4:0a:cb:68:bf:e0 ENABLED UP 11* *5/5 (13 dBm)
AP14 dc:a5:f4:05:88:c0 ENABLED UP 11* *5/5 (13 dBm)
AP11 f0:29:29:c3:ac:60 ENABLED UP 11* *5/5 (13 dBm)
AP61 bc:16:f5:1a:81:00 ENABLED UP 11* *5/5 (13 dBm)
AP31 f4:0f:1b:54:de:b0 ENABLED UP 1* *8/8 ( 2 dBm)
AP8 d0:72:dc:5e:8d:a0 ENABLED UP 11* *8/8 ( 2 dBm)
AP7 d0:72:dc:3a:f8:50 ENABLED UP 6* *8/8 ( 2 dBm)
AP6 20:3a:07:99:c8:c0 ENABLED UP 1* *5/5 (13 dBm)
AP5 50:1c:bf:48:d4:c0 ENABLED UP 11* *5/5 (13 dBm)
AP9 74:26:ac:ce:0d:b0 ENABLED UP 1* *7/8 ( 5 dBm)
AP41 40:a6:e8:77:9c:a0 ENABLED UP 11* *5/5 (13 dBm)
AP18 1c:de:a7:df:4b:40 ENABLED UP 11* *5/5 (13 dBm)

I had already replayed, but it marked as spam.. anyway.
Thanks for responding!
Performed the commands you told me, and I found that 7 APs (out of 60) are changing their Tx Power each time that RRM runs the algorithm, the APs change back and forward one level of power.


AP50 ENABLED UP 1* *6/8 ( 8 dBm)
AP60 ENABLED UP 11* *4/5 (16 dBm)
AP57 ENABLED UP 11* *6/8 ( 8 dBm)
AP28 ENABLED UP 11* *5/8 (11 dBm)
AP51 ENABLED UP 6* *6/8 ( 8 dBm)
AP9 ENABLED UP 1* *8/8 ( 2 dBm)
AP41 ENABLED UP 11* *4/5 (16 dBm)




AP50 ENABLED UP 1* *7/8 ( 5 dBm)
AP60 ENABLED UP 11* *5/5 (13 dBm)
AP57 ENABLED UP 11* *7/8 ( 5 dBm)
AP28 ENABLED UP 11* *4/8 (14 dBm)
AP51 ENABLED UP 6* *7/8 ( 5 dBm)
AP9 ENABLED UP 1* *7/8 ( 5 dBm)
AP41 ENABLED UP 11* *5/5 (13 dBm)

You will find that the channels will change more frequently in the 2.4GHz band compare to the 5GHz due to the limited amount of channels available in 2.4GHz vs 5GHz.
As Rashika mentioned adjusting your DCA would be a good idea, I would also advise making sure the interference levels are not too high in your environment as it sounds like the WLC is trying to avoid channels with high interference and use this opportunity when RRM cycle is due.
You can verify this by running the following command on the AP's:
show ap auto-rf 802.11b <ap_name>

Thanks Jurgen. What’s changing is the power levels, I guess maybe there are many 2.4 radios around.. I’ll need to go on site and take a look, as well locate them in the floor plan.

Typically you should set your RRM to 24hrs. I have seen that the best where you anchor the change also at midnight or another time where the change would have the least impact for 24x7 sites. I think you are in a good spot, to go out and identify the ap locations, but also verify that the ap's are in the correct location if this was never verified after installation. You should then be able to look at the birds eye view of the floor plan and determine which ap's should have 2.4ghz disabled if that is also in your plans.
-Scott
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