Catalyst2960 CRC Error

[CHISHIUNG]

CRC errors are increasing on the ports of the Catalyst 2960 switch. Currently, since there isn't much traffic flowing, the increase has stopped.

When checked with `show int`, input errors and CRC errors have increased.

When checked with `show int cou err`, FCS-Err and Rcv-Err have increased.

Please tell me about the possible causes.

[MHM Cisco World]

Rcv-err 

Meaning other side connect to this port have NIC issue <<- move it to other port and check error 

Or 

Cable have issue <<- change cable 

Or 

Mismatch duplex/speed <<- hardcoded speed and duplex 

MHM

[Elliot Dierksen]

I agree with the suggestion from @MHM Cisco World to check if one side of the link has duplex hard coded.

[Leo Laohoo]

Post the complete output to the following commands: 

show interface <PORT> controll

NOTE:  Do not post screenshots.

[Joshqun Ismayilov]

Hi, i'm agree with guys, it seems that it is  L1 issue 
lso you can check this :

test cable tdr interface gi0/1
show cable tdr interface gi0/1

Thanks !