topic Dot11Radio0 keeps going down in Wireless

Dot11Radio0 keeps going down

JaganV — Sun, 04 Jul 2021 05:56:27 GMT

Hi guys,

I have deployed AIR AP1142 model access points in various locations and some of them get their Radio0 going down intermittenly and the only way is to do a reload. The log just shows that the radio0 went down.

Any friends out there know what can be the issue?

Cisco IOS Software, C1140 Software (C1140-K9W7-M), Version 12.4(21a)JY, RELEASE SOFTWARE

Dot11Radio0 keeps going down

kcnajaf — Mon, 29 Oct 2012 08:37:43 GMT

Hi,

How many AP's your finding this issue? Are these AP's running over PoE switchs or are they using power adaptor? Could you please paste the exact logs from AP?

Regards

Najaf

Dot11Radio0 keeps going down

JaganV — Mon, 29 Oct 2012 09:03:59 GMT

Thanks for reply Najaf.

I have about 3 sites which have these frequent issues. They sometime can happen after 4-8 weeks.

They are on POE from 3750 or 3560 switches.

I will post the log once it happens again.

Dot11Radio0 keeps going down

JaganV — Mon, 05 Nov 2012 08:49:15 GMT

Hi Najaf,

It just happened again to one of my APs.

Logs show nothing but that the interface changed to reset:

Nov 5 07:14:02.221: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset

Nov 5 07:14:03.220: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down

Interface status:

Interface IP-Address OK? Method Status Protocol

Dot11Radio0 unassigned YES NVRAM reset down

Dot11Radio0.100 unassigned YES unset reset down

Dot11Radio0.200 unassigned YES unset reset down

Dot11Radio0 keeps going down

kcnajaf — Mon, 05 Nov 2012 12:19:43 GMT

Hi,

Just verify if this is happening with AP's connected to both 3750 as well as 3560? Also check how much power is drawned by the AP by using "show power inline" command on the switch. How many AP's are showing this symptoms?

Regards

Najaf

Dot11Radio0 keeps going down

Leo Laohoo — Mon, 05 Nov 2012 21:56:59 GMT

"reset"? Hmmm ... Can you post the complete output to the command "sh version" please?

Dot11Radio0 keeps going down

JaganV — Tue, 06 Nov 2012 02:46:40 GMT

Here is the sh ver output:

Cisco IOS Software, C1140 Software (C1140-K9W7-M), Version 12.4(21a)JA1, RELEASE SOFTWARE (fc1)

Technical Support: http://www.cisco.com/techsupport

Compiled Wed 16-Sep-09 18:09 by prod_rel_team

ROM: Bootstrap program is C1140 boot loader

BOOTLDR: C1140 Boot Loader (C1140-BOOT-M) Version 12.4(23c)JA3, RELEASE SOFTWARE (fc1)

BKGAP05 uptime is 17 hours, 20 minutes

System returned to ROM by reload

System restarted at 09:24:29 UTC Mon Nov 5 2012

System image file is "flash:/c1140-k9w7-mx.124-21a.JA1/c1140-k9w7-mx.124-21a.JA1"

Dot11Radio0 keeps going down

JaganV — Tue, 06 Nov 2012 02:49:36 GMT

Here is the power inline output from a 3750. Only the 1142s are affected. 1200 series are ok.

Module Available Used Remaining

(Watts) (Watts) (Watts)

------ --------- -------- ---------

1 480.0 55.0 425.0

Interface Admin Oper Power Device Class Max

(Watts)

--------- ------ ---------- ------- ------------------- ----- ----

Gi1/0/1 auto off 0.0 n/a n/a 30.0

Gi1/0/2 auto off 0.0 n/a n/a 30.0

Gi1/0/3 auto off 0.0 n/a n/a 30.0

Gi1/0/4 auto off 0.0 n/a n/a 30.0

Gi1/0/5 auto off 0.0 n/a n/a 30.0

Gi1/0/6 auto off 0.0 n/a n/a 30.0

Gi1/0/7 auto off 0.0 n/a n/a 30.0

Gi1/0/8 auto off 0.0 n/a n/a 30.0

Gi1/0/9 auto off 0.0 n/a n/a 30.0

Gi1/0/10 auto off 0.0 n/a n/a 30.0

Gi1/0/11 auto off 0.0 n/a n/a 30.0

Gi1/0/12 auto on 4.4 AIR-AP1231G-E-K9 n/a 30.0

Gi1/0/13 auto on 15.4 AIR-AP1142N-E-K9 3 30.0

Gi1/0/14 auto on 15.4 AIR-AP1142N-E-K9 3 30.0

Gi1/0/15 auto off 0.0 n/a n/a 30.0

Gi1/0/16 auto off 0.0 n/a n/a 30.0

Gi1/0/17 auto on 15.4 AIR-AP1142N-E-K9 3 30.0

Gi1/0/18 auto on 4.4 AIR-AP1231G-E-K9 n/a 30.0

Gi1/0/19 auto off 0.0 n/a n/a 30.0

Gi1/0/20 auto off 0.0 n/a n/a 30.0

Gi1/0/21 auto off 0.0 n/a n/a 30.0

Gi1/0/22 auto off 0.0 n/a n/a 30.0

Gi1/0/23 auto off 0.0 n/a n/a 30.0

Gi1/0/24 auto off 0.0 n/a n/a 30.0

Dot11Radio0 keeps going down

Leo Laohoo — Tue, 06 Nov 2012 03:01:20 GMT

Nah. Your PoE would not affect your WAP's radio going into "reset".

Can you post the output to the WAP command "dir" please?

Can you reload the WAP and post the entire bootup process too?

Dot11Radio0 keeps going down

kcnajaf — Tue, 06 Nov 2012 04:54:37 GMT

Hi Leo,

I'm not an expert in wireless. But still are you sure that "PoE would not affect WAP's radio going into down"??. I remember in few instance i had AP's radio going down and console was popping up with message which says something down the line like "Low power detected, reseting radio".

You mean to say this cannot happen?

Regards

Najaf

Dot11Radio0 keeps going down

Leo Laohoo — Tue, 06 Nov 2012 05:05:49 GMT

But still are you sure that "PoE would not affect WAP's radio going into down"??

Hi Najaf,

If there was something wrong with the PoE, then the WAP would power down and then up.

I believe you are refering to the event when the WAP is connected to a power injector and connected to a legacy switch like the 2940/2950/2955 and earlier.

This is due to the PoE standards and the user has to specify in the configuration the MAC address of the switch.

Re: Dot11Radio0 keeps going down

kcnajaf — Tue, 06 Nov 2012 09:49:42 GMT

Thanks response.

I don't remember how the AP was connected that time. But the symptom we where seeing was that radio card was going down rather than AP going down. It stay up sometime and drop off.

The fix was like what you suggested by setting up the manually entering the MAC on the AP.

Regards
Najaf

Sent from Cisco Technical Support iPhone App

Hello! I'm having the same

Enrique Gudino Franco — Wed, 13 May 2015 00:16:27 GMT

Hello!

I'm having the same issue, which commands did you use to get to work this?

and did you use the MAC of the switch that is showed in the "show inventory" command?

Regards !!!