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Which item in the [show interfaces counters error] command represents

zero87line
Level 1
Level 1

SW#show interfaces counters error

Port       Align-Err     FCS-Err     Xmit-Err     Rcv-Err     UnderSize     OutDiscards
Fa0/1         0                0                0              0                  0                     0

Port     Single-Col     Multi-Col     Late-Col     Excess-Col     Carri-Sen     Runts     Giants
Fa0/1       0                   0                  0                   0                   0               0            0

 

 

On a typical L2 switch

From the above items, do you know the value of CRC error without using [show interface]?

 

 

2 Accepted Solutions

Accepted Solutions

Maybe also consider . . .

sh int | inc CRC|protocol is

or some variation of the above?

For many switches, a better long term approach might be to use SNMP to pull the CRC counter and flag any that are non-zero.

View solution in original post

I am with @Joseph W. Doherty  suggest use show in | grap CRC is more effective, 
if you want to check via show error counter then check 

Align-Err, FCS-Err, Runts, giants 

View solution in original post

6 Replies 6

Try and see if this document helps. Table 1 about 1/4 way down the page. Look for Counters (in alphabetical order)

 

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-6500-series-switches/12027-53.html

DavidRuess_0-1689043818536.png

 

Hope that helps

-David

 

Align-Err, FCS-Err, Runts

If the number goes up among the three displayed items,
Can I think that a CRC error has occurred?

After that, should we proceed by checking the interface?

Of course, I know that it is accurate to see the interface information in person.
But I have to check many switches at once
It takes a lot of time to check the interface one by one for each equipment.
That's why I asked.

 

Maybe also consider . . .

sh int | inc CRC|protocol is

or some variation of the above?

For many switches, a better long term approach might be to use SNMP to pull the CRC counter and flag any that are non-zero.

I agree with and thank you for your charming command.
My client is already monitoring the network through the use of Network Management System (NMS).
However, I was just wondering what I should focus on assuming that I have to check the CRC error with only the result value for [show interfaces counters error].

I am with @Joseph W. Doherty  suggest use show in | grap CRC is more effective, 
if you want to check via show error counter then check 

Align-Err, FCS-Err, Runts, giants 

Thank you for your reply.

From the [show interfaces counters error] command
Align-Err, FCS-Err, Runts, giants
[The above four items have a direct effect on the value of CRC ERROR] Can I interpret it as that?

My first question was misleading, but it's the perfect answer I wanted.