C9800 %SWPORT-4-MAC_CONFLICT:

[Jaehune]

HI everyone

  My network environment is shown in the following picture，I looked into some loggs on my WLC 9800 and saw a bunch of loggs like this:

%SWPORT-4-MAC_CONFLICT: Dynamic mac XXXX.XXXX.XXXX from Port-channel2 conflict with WlClient, please check the network topology and make sure there is no loop.

 I want to know if this is normal，my WLC 9800 version is 17.3.8a . The AP model is C9120.

Is there an official explanation from Cisco or how should I handle it？

If this is a normal phenomenon, can I turn off this log display?

[Leo Laohoo]

The error message is a "bug".  It is not helpful nor is it accurate.  

This error message will only appear after a few weeks of WLC uptime.

[marce1000]

          - FYI : https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvt96686

 M.

[Leo Laohoo]

Thanks for sharing the Bug ID, @marce1000.