Aironet 2800 duplex mismatch

[bvj197222]

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..

[Leo Laohoo]

I believe this is a known bug.

[Mika J]

Hello,

Please check CSCvi84511

Problem appeared after upgrade from 8.5.0.110 to 8.5.0.120

Regards

[JM700]

We are seeing this on 8.3.141 (recently deferred) and 8.3.143.  We are not using the AUX port as in the bug, just the POE port.

[David Ritter]

known bug..  and it is still not fixed in 8.5.140.0 code on a 5508 with the AP attached  to a 3850 on Denali 16.3.2 code.  Its seems to be putting the LAG package in to suspend mode.

[Helmu Hill]

Hello!
Is there already a solution to this emblem? Our log server is flooded with these messages.

Affected APs only AIR-2802, WLC version 8.3.140.0

[sudhir.gupta1]

---

Hi,

Just try to upgrade to 8.5. 135 and check, may it will solve the issue

Rgds/Sudhir

[pieterh]

you can use a filter using "logging discriminator"
logging discriminator NoDupLog facility drops with XXX_AP
logging host <ip.add.re.ss> discriminator NoDupLog
wil prevent messages with text "with XXX_AP" from being sent to the syslog server

[JM700]

We are seeing this problem on 8.3.141 and 8.3.143

[davisionz]

I am seeing this on 8.3.143 with 3802 APs

[Leo Laohoo]

Upgrade to the latest 8.5. 8.3.143.0 is the final release.

[KYLE MCLERREN]

Where have you heard that 8.3.143 is the last release in that train? https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/200046-tac-recommended-aireos.html does not indicate that. I'm trying to plan future upgrades and if i should move to 8.5 from 8.3, that would be good to know.

[d.friday]

I personally moved to the 8.5 train 8.5.135.0 is the latest version out, and Cisco will be releasing a newer version the first couple of weeks in October. 8.5 code was very buggy when it came out, however it works well now. I would look at the release notes to make sure it will work for you. If you are running newer APS 3800/2800 you should be ok to move to the 8.5 train.

I hope this helps

[paulmcdougall]

We are running 5520 8.5.135 with 2802 and also have same issue/bug

[patoberli]

Upgrade to 8.3.150.0, it's fixed there:

https://www.cisco.com/c/en/us/td/docs/wireless/controller/release/notes/crn83mr5.html