2960X (DHCP Server) keeps getting flooded with DHCP conflicts

[solenol4]

Recently our 2960X is running out of DHCP scope due to DHCP conflicts. Anyone what could be causing these? There should not be another DHCP server running, but I am thinking someone possibly turned one on. I am rebooting it tonight to rule out anything corrupt on the switch itself.

[M02@rt37]

Hello @solenol4 

DHCP conflicts may be caused by a rogue DHCP server on the network, static IP conflicts, or issues with the DHCP binding database.

A rogue DHCP server, such as a misconfigured laptop or device, can assign addresses already in use, leading to conflicts.

Static IPs that overlap with the DHCP scope can also create issues, as can duplicate MAC addresses, especially with virtual machines. To troubleshoot, check the DHCP bindings on the switch with #show ip dhcp binding to identify conflicts or anomalies. Enabling DHCP Snooping can help detect and block unauthorized servers by allowing only trusted DHCP messages.

Also, verify the size of your DHCP scope to ensure it's not near exhaustion. Rebooting the switch as planned may resolve binding database corruption, but reviewing the network for unauthorized devices or misconfigurations is also critical...

[MHM Cisco World]

Dhcp conflict come from wrong IP or mask of interface and dhcp pool. 

Check this point 

MHM

[Flavio Miranda]

@solenol4 

Check If they DHCP config have properly DHCP excluded address in place. 

ip dhcp excluded-address x.x.x.x y.y.y.y