S5720-56C-HI-AC AP switch to Low frequency channel after set the calibrate 5G channel to high frequency channel.

Created: Oct 11, 2018 16:41:37Latest reply: Dec 26, 2018 15:37:29 1451 13 11 0

Some of the APs are still showing 5GHz on channel 36 (20MHz) after set the calibrate 5G channel to high frequency channel.

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regulatory-domain-profile name default

  dca-channel 5g channel-set 100,104,108,112,116,120,124,128,149,153,157,161

  dca-channel 5g bandwidth 40mhz

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1. Checking the regulatory-domain-profile, all of the channel is high frequency channle. And calibrate enable on the device. 

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regulatory-domain-profile name default

  dca-channel 5g channel-set 100,104,108,112,116,120,124,128,149,153,157,161

  dca-channel 5g bandwidth 40mhz

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2. Checking the channel switch of the AP, it shows that the switch reason is dfs, it means that the AP detect radar and after that the channel switch. It is normal that the AP switch channel when it detect radar signal. Current software version of the switch is S5720 V200R010C00SPC600 and it doesn't support radar channel choose and channel switch back, so after channel change to low channel, before next calibration, the AP will keep on low channel. 

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3. Recommend upgrade software of the switch to V200R011C10SPC600 and install patch V200R011SPH005. After upgrade,enable calibration bandwidth function, it is enable by default. With this way, after the AP detect radar signal, it will switch to other random channel, if the channel is low channel, the AC will enable calibrate bandwidth and change to high frequency channel. 

<HUAWEI> system-view

[HUAWEI] wlan 

[HUAWEI-wlan-view] regulatory-domain-profile name huawei

[HUAWEI-wlan-regulate-domain-huawei] dca-channel 5g bandwidth 40mhz


Recommend upgrade software of the switch to V200R011C10SPC600 and install patch V200R011SPH005. After upgrade,enable calibration bandwidth function, it is enable by default. With this way, after the AP detect radar signal, it will switch to other random channel, if the channel is low channel, the AC will enable calibrate bandwidth and change to high frequency channel. 

<HUAWEI> system-view

[HUAWEI] wlan 

[HUAWEI-wlan-view] regulatory-domain-profile name huawei

[HUAWEI-wlan-regulate-domain-huawei] dca-channel 5g bandwidth 40mhz

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Mark.hu  Visitor   Created Oct 12, 2018 08:42:51 Helpful(0) Helpful(0)

This post was last edited by Mark.hu at 2018-10-31 15:07. it's good sharing , thanks your hard working, I think it is very important here.ecommend upgrade software of the switch to V200R011C10SPC600 and install patch V200R011SPH005. After upgrade,enable calibration bandwidth function, it is enable by default. With this way, after the AP detect radar signal, it will switch to other random channel
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No.9527  Visitor   Created Oct 15, 2018 08:55:48 Helpful(0) Helpful(0)

This post was last edited by No.9527 at 2018-10-31 14:46. Radios need to adjust the AMC algorithm according to different scenarios to deliver the optimal user experience. Three AMC algorithms are available:
  • auto-balance: applicable to most wireless scenarios
  • high-stability: applicable to scenarios with continuous interference.
  • high-throughput: applicable to scenarios with good wireless signals and non-continuous interference.
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Torrent     Created Oct 15, 2018 14:30:00 Helpful(0) Helpful(0)

This post was last edited by Torrent at 2018-10-31 15:34. Checking the channel switch of the AP, it shows that the switch reason is dfs, it means that the AP detect radar and after that the channel switch. It is normal that the AP switch channel when it detect radar signal. Current software version of the switch is S5720 V200R010C00SPC600 and it doesn't support radar channel choose and channel switch back, so after channel change to low channel, before next calibration, the AP will keep on low channel. 

thanks for sharing!
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Mark.hu  Visitor   Created Oct 15, 2018 15:31:28 Helpful(0) Helpful(0)

This post was last edited by Mark.hu at 2018-10-31 15:09. t's good sharing , thanks your hard working, I think it is very important here.ecommend upgrade software of the switch to V200R011C10SPC600 and install patch V200R011SPH005. After upgrade,enable calibration bandwidth function, it is enable by default. With this way, after the AP detect radar signal, it will switch to other random channe
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yjhd     Created Oct 15, 2018 15:32:10 Helpful(0) Helpful(0)

This post was last edited by yjhd at 2018-10-31 17:13.

can you detail for below?

Recommend upgrade software of the switch to V200R011C10SPC600 and install patch V200R011SPH005. After upgrade,enable calibration bandwidth function, it is enable by default. With this way, after the AP detect radar signal, it will switch to other random channel, if the channel is low channel, the AC will enable calibrate bandwidth and change to high frequency channel. 

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GongXiaochuan  Visitor   Created Oct 15, 2018 16:42:34 Helpful(0) Helpful(0)

This post was last edited by GongXiaochuan at 2018-10-30 12:39.

A new version can resolved the issue , thank you for sharing

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Good Good Study Day Day Up
lizhi94     Created Oct 16, 2018 11:58:05 Helpful(0) Helpful(0)

This is exactly what I was looking for. I have been stuck for a long time on this problem. you gave me a very good idea ,I very much appreciate it.

Please keep on post and share more cases for all of us
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Skay  Visitor   Created Oct 16, 2018 15:22:28 Helpful(0) Helpful(0)

Great example , after did this , i am also solve one issue .Recommend upgrade software of the switch to V200R011C10SPC600 and install patch V200R011SPH005. After upgrade, enable calibration bandwidth function, it is enable by default. With this way, after the AP detect radar signal, it will switch to other random channel, if the channel is low channel, the AC will enable calibrate bandwidth and change to high frequency channel.
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No.9527  Visitor   Created Oct 19, 2018 11:30:13 Helpful(0) Helpful(0)

I am very interested for this post, which is very helpful to our daily troubleshooting. I always have similar problems in my daily work, but I do not know how to deal with them. Now I have a clear idea. Thank you very much for your sharing. Hope you can update continue like this
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