CRC troubleshooting - Cisco Catalyst

[mcow]

Are there any troubleshooting commands that can be performed to rule out a transceiver issue? In the past I typically start at one end of the link and start replacing sfp's and fiber optic patch cords until the CRC errors stop incrementing.

[pman]

Hi,

CRC Indicates that the cyclic redundancy checksum generated by the originating LAN station or far-end device does not match the checksum calculated from the data received. On a LAN, this usually indicates noise or transmission problems on the LAN interface or the LAN bus itself. A high number of CRCs is usually the result of collisions or a station transmitting bad data.

show interface <type> <num>

show interface <type> <num> controller

try this one:

https://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1904.html

[mcow]

Also, one more thing to note.  This interfaces is a point to point link between two Cat 9000's and I cleared the counters on the interface the other day when I first noticed this.  Please see attachment.

Thanks

[MHM Cisco World]

what is type of SW you use 
Cut-through 
or 
storage ?

[paul driver]

Hello

sh interface capabilities

sh interface transceiver detail
sh interface  xxxx transceiver detail

[mcow]

As mentioned above, this interfaces is a point to point link between two Cat 9000's and I cleared the counters on the interface the other day when I first noticed this.  Please see attachment.

Interface

Twe2/0/21