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AP 5 GHz radio dies, works after reset

emily00001
Level 1
Level 1

‎04-19-2016 03:24 PM - edited ‎07-05-2021 04:55 AM

I have a WLC 2504 running with a number of AP2702i and after investigating the complaints of users I noticed that two APs stopped taking 5 GHz clients. It looks like the radio just turned off despite the WLC listing them as both 2.4 and 5 GHz enabled.

Has anyone seen anything like this and knows how to mitigate it? After I reset the AP it would appear to work fine. Anything in particular I should look for in the log or settings?

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7 Replies 7

Philip D'Ath
VIP Alumni
VIP Alumni

‎04-19-2016 05:15 PM

What software version are you running on your 2504?

I find it a bit suspicious that only two AP's are affected, like a hardware issue.  Anything appear of interest in the 2504 log?

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emily00001
Level 1
Level 1
In response to Philip D'Ath

‎04-23-2016 01:42 PM

I have 7.6.130.0 running on the WLC. Nothing super interesting in the log, I tried looking for keywords such as radio and similar but found nothing I could identify  as the problem. I also don't know the exact time that the 5 GHz stopped working so I have quite a long log where the event could be. The log i have is from a syslog and the WLC is logging with debug level.

I haven't done an analysis although I think the max EAPOL key retransmission exceeded events increased but it probably has to do with more users ending up on 2.4 GHz so it's a consequence of this issue rather than a cause of the problem in the first place.

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emily00001
Level 1
Level 1
In response to Philip D'Ath

‎04-23-2016 02:41 PM

I should be able to but it will take me a while as the system is in production. I will drop a line if I find out something useful with the gold star release.

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emily00001
Level 1
Level 1
In response to mohanak

‎04-23-2016 02:43 PM

Thanks! Didn't know about this command. Will have to check it with the console cable as my ssh login doesn't allow me to go into privileged exec for some reason.

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emily00001
Level 1
Level 1
In response to mohanak

‎05-24-2016 10:33 AM

Hi, I checked on the radio reset codes and got a failed reset for error code 51. Not sure if this carries any significance as the error code has occurred before and apparently with successful resets.

How come the equipment doesn't try to reset again after a failed attempt? Is that something that can be implemented.

Either way I got a new software release so I will be upgrading to that when I'm allowed to schedule a service window but since this happened again (this time with a different AP) I figured I would update this here in case it may shed some more light on this issue or help someone in the future.

AP_EVENT#show controllers dot11Radio 1 | include reset
Jammer Radio resets: 0
Radio PCI resets:27
Last radio reset code: 51
Radio resets - total:80 retries:2 failed:1
AP_EVENT#show trace dot11_rst display time format local
AP_EVENT#show trace dot11_rst

*May 10 12:18:58 Radio d1 RST 51 Flags 202012D BCN 1
*May 10 16:29:02 Radio d1 FST 14 Flags 2020105 BCN 1
*May 10 16:29:02 Radio d1 RST 71 Flags 202010D BCN 1
*May 10 21:09:41 Radio d1 FST 14 Flags 2020105 BCN 1
*May 10 21:09:41 Radio d1 RST 71 Flags 202010D BCN 1
*May 11 14:53:35 Radio d1 RST 62 Flags 2060105 BCN 1
*May 11 14:53:35 Radio d1 RST 81 Flags 206012D BCN 0
*May 11 14:53:35 Radio d1 RST 62 Flags 206012D BCN 0
*May 11 15:01:42 Radio d1 RST 62 Flags 2060105 BCN 1
*May 11 15:02:55 Radio d1 FST 14 Flags 2020105 BCN 1
*May 11 15:02:55 Radio d1 RST 71 Flags 202010D BCN 1
*May 12 11:07:43 Radio d1 FST 14 Flags 2020105 BCN 1
*May 12 11:07:43 Radio d1 RST 71 Flags 202010D BCN 1
*May 12 11:07:43 Radio d1 RST 51 Flags 202012D BCN 1
*May 12 11:17:53 Radio d1 FST 84 Flags 2012D BCN 0
*May 12 11:17:53 Radio d1 RST 71 Flags 2012D BCN 0
*May 12 17:22:07 Radio d1 FST 14 Flags 2020105 BCN 1
*May 12 17:22:07 Radio d1 RST 71 Flags 202010D BCN 1
*May 13 09:37:05 EOB
*May 13 09:37:05 Radio d1 FST 14 Flags 2020105 BCN 1
*May 13 09:37:05 Radio d1 RST 71 Flags 202010D BCN 1
*May 13 17:15:12 Radio d1 FST 14 Flags 2020105 BCN 1
*May 13 17:15:12 Radio d1 RST 71 Flags 202010D BCN 1
*May 13 17:15:21 Radio d1 FST 14 Flags 2020105 BCN 1
*May 13 17:15:21 Radio d1 RST 71 Flags 202010D BCN 1
*May 13 17:15:29 Radio d1 FST 14 Flags 2020105 BCN 1
*May 13 17:15:29 Radio d1 RST 71 Flags 202010D BCN 1
*May 13 17:15:29 Radio d1 RST 51 Flags 202012D BCN 1
*May 13 17:15:40 Radio d1 FST 14 Flags 2020105 BCN 1
*May 13 17:15:40 Radio d1 RST 71 Flags 202010D BCN 1
*May 13 17:15:40 Radio d1 RST 51 Flags 202012D BCN 1
*May 16 08:13:41 Radio d1 RST 62 Flags 2060105 BCN 1
*May 16 17:45:48 Radio d1 FST 14 Flags 2020105 BCN 1
*May 16 17:45:48 Radio d1 RST 71 Flags 202010D BCN 1
*May 18 11:08:22 Radio d1 FST 14 Flags 2020105 BCN 1
*May 18 11:08:22 Radio d1 RST 71 Flags 202010D BCN 1
*May 18 14:22:24 Radio d1 RST 62 Flags 2060105 BCN 1
*May 18 14:22:24 Radio d1 RST 81 Flags 206012D BCN 0
*May 19 06:57:19 Radio d1 RST 62 Flags 2060105 BCN 1
*May 20 10:01:40 Radio d1 RST 62 Flags 2060105 BCN 1
*May 20 14:05:19 Radio d1 RST 62 Flags 2060105 BCN 1
*May 20 14:45:56 Radio d1 RST 62 Flags 2060105 BCN 1
*May 20 15:16:23 Radio d1 RST 62 Flags 2060105 BCN 1
*May 20 23:54:09 Radio d1 RST 62 Flags 2060105 BCN 1
*May 21 22:44:43 Radio d1 RST 62 Flags 2060105 BCN 1
*May 23 19:39:58 Radio d1 FST 14 Flags 2020105 BCN 1
*May 23 19:39:58 Radio d1 RST 71 Flags 202010D BCN 1
*May 23 19:48:52 Radio d1 FST 14 Flags 2020105 BCN 1
*May 23 19:48:52 Radio d1 RST 71 Flags 202010D BCN 1
*May 23 19:49:21 Radio d1 FST 14 Flags 2020105 BCN 1
*May 23 19:49:21 Radio d1 RST 71 Flags 202010D BCN 1
*May 23 20:24:40 Radio d1 FST 14 Flags 2020105 BCN 1
*May 23 20:24:40 Radio d1 RST 71 Flags 202010D BCN 1
*May 23 20:27:17 Radio d1 FST 14 Flags 2020105 BCN 1
*May 23 20:27:17 Radio d1 RST 71 Flags 202010D BCN 1
*May 23 20:38:16 Radio d1 FST 14 Flags 2020105 BCN 1
*May 23 20:38:16 Radio d1 RST 71 Flags 202010D BCN 1
*May 23 20:51:15 Radio d1 FST 14 Flags 2020105 BCN 1
*May 23 20:51:15 Radio d1 RST 71 Flags 202010D BCN 1
*May 24 09:19:20 Radio d1 FST 14 Flags 2020105 BCN 1
*May 24 09:19:20 Radio d1 RST 71 Flags 202010D BCN 1
*May 24 09:19:20 Radio d1 RST 51 Flags 202012D BCN 1
*May 24 10:58:54 Radio d1 RST 62 Flags 2060105 BCN 1
*May 24 14:01:38 Radio d1 RST 62 Flags 2060105 BCN 1
*May 24 16:28:19 Radio d1 FST 79 Flags 2020105 BCN 1
*May 24 16:28:19 Radio d1 RST 71 Flags 202010D BCN 1
*May 24 16:28:19 Radio d1 RST 51 Flags 202012D BCN 1

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