#show cdp n fastEthernet 0/1 Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID BDCHSS10 Fas 0/1 126 R S I WS-C3750-4Fas 1/0/19 London-TT# *Mar 2 13:49:09.151: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on Fast Ethernet0/1 (not half duplex), with BDCHSS10 FastEthernet1/0/19 (half duplex).
You need the keyword detail on the end of that command: show cdp n Fa0/1 detail.
That way it will give you a lot more information, including the IP address of the 3750 switch.
You could probably get rid of the error by forcing your side of the link to be half-duplex, but that would not be the best solution.
It is also possible that you have tried to hard-code full duplex, but the other side is in auto. If that is the case, then making your side auto would not only get rid of the error message, but would also make the link full duplex.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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