Wired Intelligent Edge

At one of our sites we created a 3x HP 5120 IRF stack as core switch. All other switches are connected by fiber in a mix of 7 layer 2 2620 POE switches and  2 x 5120 Switches.

Connected on these 2620 POE switches are AP's (Motorola AP6532) with local breakout

Now we are getting loads of ARP_DUPLICATE_IPADDR_DETECT messages only for wireless devices and every time referring to uplink ports of these access switches. These messages are  only showing up on our core (irf stacked) switch.

Also MSTP is running quite fine , core switch is the stp root and verified on wokring and for now  loops don't exist.

Already tried to enter mac-roaming-enable and mac-address station-move quick-notify enable . 

Also played with mac-address timer aging and  arp timer aging  but untill now no luck of getting rid of these messages.

The rest of the config is pretty straight forward, even updated the firmware to the latest available version on all switches.

Does anyone had this same problem and knows a fix ?

I have got a similar situation I believe, the things I have in common with you, is that I have 3 * 5120 IRF and some HP wireless APs and a controller. I got a lot of the same error you mentioned, and I noticed that within the same error sometimes it is the same mac-addres.It says for example "mac-address 11:11:11:11:11:11 on interface 1/0/1 has the same IP address as mac-address 11:11:11:11:11:11 on interface 2/0/2". This was weird and looked like normal roaming.
I noticed that wireless VLAN has a DHCP relay to a group having 2 DHCP servers. Although that might not make any sense, but I created a DHCP pool on the IRF and canceled the relay, and I'm monitoring the site, it seems I got rid of the issue, but I will confirm.

Regards,