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Aironet 2800 duplex mismatch

bvj197222
Level 1
Level 1

Our switch, WS-C3750X-24P running 15.0(2)SE4, keeps Reporting Duplex mixmatch With most of Our 2800 AP's;

 

Mar 14 09:32:18.338: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet1/0/14 (not half duplex), with XXX_AP3 GigabitEthernet0 (half duplex).
Mar 14 09:32:21.786: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet2/0/16 (not half duplex), with XXX_AP6 GigabitEthernet0 (half duplex).

 

The WLC (Cisco 5508, sw 8.3.140.0) reports speed 1000 and Duplex full. The switch also reports a-full and a-1000 on the switchports. I can only assume that this is a bug somewhere..

 

27 Replies 27

powys
Level 1
Level 1

We're getting this on both Catalyst and Small Business switches, the WLC is running 8.3.143.0. Upgrading to 8.5.x would involve a lot of work as we still have older APs which are supported on 8.3.x but not 8.5.x.

This is a known issue with 8.3.143.0. See here for more information:
https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/200046-tac-recommended-aireos.html#anc9
It's this bug: https://tools.cisco.com/bugsearch/bug/CSCvi02106
Field notice: https://www.cisco.com/c/en/us/support/docs/field-notices/702/fn70252.html
You can either open a TAC and you get a new 8.3.14x.x image where this is fixed, or wait until the next normal 8.3 release is out.
Please note, it's just a cosmetical issue and the AP/Switch is working correctly.

moved to 8.5.140.0 and all is well
Thank you

Same phenomenon with Aironet 2800 and WLC SW 8.5.160 on Catalyst 2960X

Then it should be a different bug. Please open a new thread and include the error messages you see and also the configuration of the switchport plus software version of the switch.

Ok i will open a new thread

I agree with Patrick.
If the controller is running 8.5MR6 and this message is still appearing, contact Cisco TAC as this could be a new bug.

I am using 8.5.151.0 and having same issue with one 2802 AP.

That is not possible, the problem was temporary and has now gone and is not reproducible, i had running 40 2802I temporary for an event and the issue was only on one port of an 2960X.

The AP´s were deployed to six 2960X but the issue was on only one port of an 2960X although all switchports and all AP´s had the same identical configuration.

Hi,

Same issue with 8.3.143.0

Any luck with this ?


@zumriatha wrote:

Same issue with 8.3.143.0


8.3.143.0 was released on 05 June 2018.

The fix is found in release 8.5.151.0 which was released back in 20 June 2019

Try upgrading the firmware of the controller.

 

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