Network disconnection Wireless

[Robo123]

I have C9800-40-K9 Anchor controller located in "A" location and Foreign controller in Location "B" .Our users are connecting in Foreign  controller where i can see no issues facing by the Windows users but at same time MAC users are facing the network drop issue .Can some one help me to know what would be the reason.

[Mark Elsen]

 - Use client debugging as explained in https://logadvisor.cisco.com/logadvisor/wireless/9800/9800ClientConnectivity ; you can have 'Radioactive Traces' (client debugs) analyzed with : https://cway.cisco.com/tools/WirelessDebugAnalyzer/
   Also have a checkup review  of the foreign and anchor controller configuration with the CLI command show tech wireless  ; have the output analyzed by https://cway.cisco.com/tools/WirelessAnalyzer/

 M.

[Robo123]

Hi Marce, Thanks for the replay.I checked and seen Gaint and input errors are increasing on the uplink port. please look on the below.

Note : these are L2 Trunkport and no issue in the MTU part as well.

input flow-control is on, output flow-control is unsupported
Last input 00:00:00, output 00:00:00, output hang never
5 minute input rate 3322000 bits/sec, 736 packets/sec
1943239 packets input, 1184733300 bytes, 0 no buffer
130 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 221816 multicast, 0 pause input
0 input packets with dribble condition detected
78 unknown protocol drops

[Flavio Miranda]

Hello,

     If the disconnection is frequently you can try to keep a debug client running. This would be a good way to see some possible problem. If the disconnection is randomly which makes it hard to keep the debug running, you need to see if you may have some feature that is not supported by Mac. For example, Fast transition , Aironet IE , 11k. Those are feature that can cause problem.

 You can disable features after hours and test, if not that enable again and go to the next. Make sure you Mac wireless adapter driver does not have some documented issue. 

[Robo123]

can you please give some solution for gaint erros.

we have observed there is a intermittend drop issue towords wireless gateway at same time data path is looks fine .

Can you please suggest on this

[Flavio Miranda]

It is difficult to say anything only with this information.  I would suggest for you try to add a sniffer on this port for deeper investigation.

 But, honestly I dont believe it could be connectivity issue because this should impact any client. As per your description windows clients is fine.

[Robo123]

do we have any settings or config separately to do in Controller for MAC users?

Any limitation for MAC users in AIR-CT5508-K9 controller?

[Rich R]

No special settings for MACs.  Refer to @Flavio Miranda 's previous replies on things to look at (802.11 features which may cause problems for some clients).  Make sure the client OS and drivers are up to date.

You said "C9800-40-K9" initially, now you say "AIR-CT5508-K9" - I assume that means you're using IRCM between 9800 and 5508? 

Check that you are using the very latest TAC recommended versions of software in both cases.  For 5508 that should be  8.5.182.105 (8.5 IRCM) as per Field Notice FN72524 :
https://software.cisco.com/download/specialrelease/bc334964055fbd9440834f008e5aca34. 
For 9800 that should be 17.9.3 as per TAC recommended link below.

I don't think the problem has anything to do with those few input errors on the switch port.  You mention gaint errors - I assume you mean giant but none of the output you shared shows giant errors?  What giant errors are you seeing and where are you seeing them and how often?

For intermittent client issues on 9800 also see new tool https://developer.cisco.com/docs/wireless-troubleshooting-tools/#!wireless-detector-wireless-detector