A duplex mismatch is reported if the settings on two sides of a link are different.
Issue the show interfaces command for Cisco IOS Software and the show port command for Catalyst OS (CatOS) commands, and check the duplex settings on both sides of the link. Make sure they match. If the settings on both devices match, check the reported values through Simple Network Management Protocol (SNMP).
For CatOS and Cisco IOS switches, refer to this output:
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Hardware Version: F1
Loopback detect setting