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Input and CRC errors

abarb002
Beginner
Beginner

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

julian.bendix
Participant
Participant

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

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

Reza Sharifi
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

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

HTH

Leo Laohoo
Hall of Fame Community Legend Hall of Fame Community Legend
Hall of Fame Community Legend
Post the complete output to the command "sh interface <PORT> controll".

julian.bendix
Participant
Participant

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

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

cmarva
Enthusiast
Enthusiast

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

 

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. 

Leo Laohoo
Hall of Fame Community Legend Hall of Fame Community Legend
Hall of Fame Community Legend
Post the complete output to the command "sh interface <PORT> controll".

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

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