@Amr_Fayrouz_Elattar you can configure mac-address-based acl to deny the specific mac address, [Router] acl number 4001 // 4001 - 4999 [Router-acl-L2-4001] rule 5 deny source-mac xxxx-xxxx-xxxx
@Amr_Fayrouz_Elattar could you please provide detailed information, where the DHCP server are implemented ? A simple way to deny the specific mac address, you can configure ACL which based on the mac address, but this will deny all the traffics come from the denied device.
@Amr_Fayrouz_Elattar you can configure mac-address-based acl to deny the specific mac address, [Router] acl number 4001 // 4001 - 4999 [Router-acl-L2-4001] rule 5 deny source-mac xxxx-xxxx-xxxx
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