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The command "show interfaces ethernet" is used to troubleshoot a problem on the media. The output shows many CRC errors but not too many collisions. What can be the cause of this issue?
Excessive Runt frames
No link integrity on the media type.
If the output shows many CRC errors but not too many collisions on the Ethernet interfaces it is an indication of excessive noise. To fix this issue check for cables that might be damaged or devices nearby which may cause noise. Excessive collisions can be caused by unterminated Ethernet cables. Runt frames are caused by collisions and are the result of underrruns or bad software on a network interface card. For more information refer to: http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html
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