Duplex Mismatch

Issue on UC520 (FastEthernet) connected to Cisco837 ADSL Router (Ethernet)

*Mar 3 16:50:04.803 UTC: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on Ethernet0 (not full duplex), with UC520 FastEthernet0/0 (full duplex).

Soution:
Change the int fa0/0 to half duplex
(Duplex and Speed command under the Interface)

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