Global Change to 40 Mhz Channel Width

[Sean Coogle]

I have multiple Cisco 5508 controllers running 3502i AP's and I am on code 7.6.100. All of my controllers are using the 40Mhz channel width with channel bonding globally. For some reason,  I have one of the controllers not allowing me to run 40Mhz channel width on 802.11a/n/ac. I can do this if I change it to custom, but I do not have to do this on other controllers. What am I missing?

[Rasika Nayanajith]

Hi 

Have you tried do this via CLI as shown below.

config 802.11a disable network
y
config advanced 802.11a channel dca chan-width-11n 40
config 802.11a enable network

You can verify using the below command

(5508-1) >show advanced 802.11a channel 

 Leader Automatic Channel Assignment
  Channel Assignment Mode........................ AUTO
  Channel Update Interval........................ 12 Hours
  Anchor time (Hour of the day).................. 7 
  Update Contribution
    Noise........................................ Disable
    Interference................................. Disable
    Load......................................... Disable
    Device Aware................................. Disable
  CleanAir Event-driven RRM option............... Enabled
  CleanAir Event-driven RRM sensitivity.......... High
  Channel Assignment Leader...................... TEST-WC01 (x.x.33.1) (::)
  Last Run....................................... 31409 seconds ago
  Last Run Time.................................. 0 seconds
  DCA Sensitivity Level.......................... MEDIUM (15 dB)
  DCA 802.11n/ac Channel Width................... 40 MHz
  DCA Minimum Energy Limit....................... -95 dBm

HTH

Rasika

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[Sean Coogle]

Thanks so much for the reply. I did this, but it appears the Channel Width here shows 40 Mhz. My issue is the RF Channel Assignment shows no bonded channels and still shows the Channel Width at 20 MHz.. Below is a screen shot of the output after running the commands.

MP-WLC-3) config>802.11a disable network

Disabling the 802.11a network may strand mesh APs. Are you sure you want to continue? (y/n)y

(MP-WLC-3) config>
(MP-WLC-3) config>advanced 802.11a channel dca chan-width-11n 40

(MP-WLC-3) config>802.11a enable network                       

(MP-WLC-3) config>exit
(MP-WLC-3) >show advanced 802.11a channel

 Local Automatic Channel Assignment
  Channel Assignment Mode........................ AUTO
  Channel Update Interval........................ 600 seconds
  Anchor time (Hour of the day).................. 0
  Update Contribution
    Noise........................................ Enable
    Interference................................. Enable
    Load......................................... Disable
    Device Aware................................. Disable
  CleanAir Event-driven RRM option............... Disabled
  CleanAir Event-driven RRM sensitivity.......... Medium
  Channel Assignment Leader...................... MP-WLC-2 (10.223.255.232)
  DCA Sensitivity Level.......................... MEDIUM (15 dB)
  DCA 802.11n/ac Channel Width................... 40 MHz
  DCA Minimum Energy Limit....................... -95 dBm

When going to the GUI and looking at the RF Channel Assignment, I see this:

[Sean Coogle]

Also, I am not seeing an attempt for auto channel assignment on this controller.

[Scott Fella]

You should be on v7.6.130.0 for stability.  Try to force a restart for RRM on the 5ghz

config 802.11a channel global restart

If that doesn't work, have you rebooted the WLC to see if  "Last Auto Channel Assignment" changes?

-Scott

[Sean Coogle]

I am on 7.6.100 and have actually had great results on all 12 controllers running this. All other controllers have the 40Mhz channel width showing globally, but not this one. I will try this Scott and see what happens. I have to schedule downtime, but will let you know.

Thanks,

Sean

[Abhishek Abhishek]

Please refer to the link-

http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-5/config_guide/b_cg75/b_cg75_chapter_01111101.html#ID351

[Aydin Ehtibarov]

updated command to enable 40mhz channel width for code 8.5.140 

config 802.11a disable network
y
config advanced 802.11a channel dca chan-width 40
config 802.11a enable network