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I have a Cisco Catalyst 3560-CG that has two combo ports with SFP and RJ45 each. Is it possible to manually set the combo port to use the RJ45 only? If so, how is it done? I am troubleshooting a connection and I don't want this to be a variable.

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It is the media-type interface command:

interface <slot/port>
 media-type rj45
!

-or-

interface <slot/port>
 media-type sfp
!
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  • That's it, thanks! It turns out my copper port may have dirty or bad pins. – Yanzzee Dec 6 '17 at 18:37
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The 3560 uses the physical port that can get a link and deactivates the other as long as the link is up. When both variants can get a link (at power on) the SFP port is prioritized.

You can disable the SFP priority with the interface media-type command.

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