usurpation de Mac-address

[druartx]

Hello,

I configured my switch 2530-24 to do 802.1X authentication and Local Mac address (LMA) on all ports.
Everything works fine but there is a point that blocks me.
If an acker duplicates the mac-address of a pc belonging to the LMA, it takes its place.
Example: I have a SIP Phone on port 4 in vlan 108 and a PC in the trash vlan.
If I configure the SIP Phone's mac-address in the PC, the SIP Phone disappears from the authentication and the PC is authenticated.
Is there a way to ensure that once the mac-address registered in the mac-table becomes unique and not usable by another machine.
I tried everything and nothing works
Is it possible to do the anti mac-spoofing with the HP Procurve 2530 ?
Thank you in advance for your help