Port Flapping

[taro75]

I have 9200 switch with endpoints connected to it. One particular port is frequently going up and down. [Line protocol changes state to up / down]. This port is connected to a PC. How can I identify the root cause of this failure? It's not related to spanning tree because it's connected to PC. How can I enable some debug commands for this particular interface?

[M02@rt37]

Hello @taro75,

do sh interface X/X command and check any errors or other thing that could conduct to L1 issue (cable)

[Richard Pidcock]

As suggested by M02@rt37 , that would be my guess.  I'd look for indicators of a cabling issue.  Have you replaced the cable, or if possible can you test your cabling end to end with a tester?  It's possible to be house cabling vs. just a patch cord.