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Beginner

Input and CRC errors

I am experiencing a high volume of input and CRC errors to the point that my ports disabling and enabling themselves. These are two Ten gig ports that are port channeled to a layer 3 switch. Is there a way to prevent this errors? I've already swapped cables, but that didn't seem to work. I'm using a 3850 switch. 

2 ACCEPTED SOLUTIONS

Accepted Solutions
Beginner

Re: Input and CRC errors

Hi!

CRC Errors most commonly indicate that there is something wrong at hardware level, 
but it can be speed/duplex mismatch as well.

Are both sides Catalyst 3850?

If no, what is the other side of the port-channel?

Can you post the following outputs?

#show interface <type> <num>

#show run interface <type> <num>

#show interface <type> <num> controller

 

Best regards
Julian

View solution in original post

Beginner

Re: Input and CRC errors

The log was first saying flapping between ports Te 3 and 4. I was receiving a high number of input and CRC errors. These are fiber connections and I don't have replacement cables. So I'm praying this isn't the issue. 

View solution in original post

8 REPLIES 8
VIP Expert

Re: Input and CRC errors

Can you check speed and duplex on both sides of the interfaces to make sure they are matching?

HTH

Hall of Fame Community Legend

Re: Input and CRC errors

Post the complete output to the command "sh interface <PORT> controll".
Beginner

Re: Input and CRC errors

Hi!

CRC Errors most commonly indicate that there is something wrong at hardware level, 
but it can be speed/duplex mismatch as well.

Are both sides Catalyst 3850?

If no, what is the other side of the port-channel?

Can you post the following outputs?

#show interface <type> <num>

#show run interface <type> <num>

#show interface <type> <num> controller

 

Best regards
Julian

View solution in original post

Beginner

Re: Input and CRC errors

Was able to get replacement cables and that solved the issue. Thanks. 

Participant

Re: Input and CRC errors

when you say disabling themselves do you mean they are going errdisabled? If so the reason will be in the log.

 

Beginner

Re: Input and CRC errors

The log was first saying flapping between ports Te 3 and 4. I was receiving a high number of input and CRC errors. These are fiber connections and I don't have replacement cables. So I'm praying this isn't the issue. 

View solution in original post

Hall of Fame Community Legend

Re: Input and CRC errors

Post the complete output to the command "sh interface <PORT> controll".
Beginner

Re: Input and CRC errors

Was able to get replacement cables and that solved the issue. Thanks. 

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