Perdida de conexion en APs AIR-CAP2702E-A-K9

[Ivan Garcia]

Buenas noches Comunidad,

Tengo un problema con 3 APs en los cuales los usuarios pierden conexión al momento que hacen roaming o se encuentran estáticos. Este ambiente es un almacén grande en el que cada ap se encuentra a 10m de altura, por cada pasillo hay 1 ap , los aps se encuentra administrados bajo una WLC 5508, los aps son modelo AIR-CAP2702E-A-K9 con versión de IOS 15.3(3)JF12$. Revisando los logs de los APs encontré esto:

*Apr 11 15:32:52.443: %CAPWAP-5-SENDJOIN: sending Join Request to 10.30.94.10
*Apr 11 15:32:52.671: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio0 due to the reason code 56
*Apr 11 15:32:52.679: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Apr 11 15:32:52.687: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Apr 11 15:32:53.303: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio1 due to the reason code 56
*Apr 11 15:32:53.303: %DOT11-5-EXPECTED_RADIO_RESET: Restarting Radio interface Dot11Radio0 due to the reason code 10
*Apr 11 15:32:53.311: %CAPWAP-5-JOINEDCONTROLLER: AP has joined controller ALICORP_HUACHIPA-WLC_5508
*Apr 11 15:32:53.427: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Apr 11 15:32:53.483: %WIDS-6-ENABLED: IDS Signature is loaded and enabled
*Apr 11 15:32:53.679: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Apr 11 15:32:53.687: %DOT11-4-NO_HT: Interface Dot11Radio0, Mcs rates disabled on wlan 2 due to not using AES encryption or encryption is not disabled
*Apr 11 15:32:53.687: %DOT11-4-NO_HT: Interface Dot11Radio0, Mcs rates disabled on wlan 3 due to not using AES encryption or encryption is not disabled
*Apr 11 15:32:53.727: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to down
*Apr 11 15:32:53.735: %LINK-5-CHANGED: Interface Dot11Radio1, changed state to reset

Podrían apoyarme como solventar este inconveniente?

[Flavio Miranda]

Hi @Ivan Garcia 

 The logs is very interesting but it is also possible that  it lead us to a wrong conclusion, but, as per the logs, I can see that:

Mcs rates disabled on wlan 3 due to not using AES encryption or encryption is not disabled

the WLC is complaining about you do not enable AES on the WLAN.  If you don´t have a valid reason to keep AES disable, enable it. AES is a strong encryption algorithm and should not be disabled.  Unless you disabled it for some reason, I strongly advise you to enable AES and WPA2. Dont use WPA and TKIP only.

 Well, then we see the logs which can cause you problem:

Apr 11 15:32:53.727: %LINK-6-UPDOWN: Interface Dot11Radio1, changed state to down

The radio is disabled by the WLC and this can cause your users to disconnect.  However, I need to advise you that although the logs is in sequence, not necessarily the AES problem is causing the shutdown on the radios.

For security and to eliminate variable, enable AES and look at the logs again please.

[Ivan Garcia]

Hi @Flavio Miranda, thanks for the help, but checking the WLANs the problem is with WLAN 1 called R00_A as you can see it has AES configured

[Flavio Miranda]

Then, the problem is something else and disconection while roaming can be coverage (The Access Point Cell overlad is not enough) or it can be some feature.  Do you have Fast Transition enabled?

11v BSS Transition Support ? it may cause roaming problem when devices does not support it.  You can check this on the advanced tab of the wlan

And Fast Transition you check on the Security tab of the wlan.

You can play with it just to make sure this is not the cause.