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July 28th, 2021 21:00

Does the porterrshow output (disc c3 errors without c3timeout) mean there wasn't I/O timeout at all?

Hi all,

I got a output below.

porterrshow        :
          frames      enc    crc    crc    too    too    bad    enc   disc   link   loss   loss   frjt   fbsy  c3timeout    pcs
       tx     rx      in    err    g_eof  shrt   long   eof     out   c3    fail    sync   sig                  tx    rx     err
  1:  292.6m 596.4m   0      0      0      0      0      0      0     75      0      0      0      0      0      0      0      0   

There are 75 disc c3 errors but no c3timeout errors.

"A frame can be discarded for a number of reasons; Timeout, destination unreachable, zone discard, or other reasons for discard. Most of the time you will see timeout, which means a frame is longer than E_D_TOV in the buffer."

With this output, can I 100% eliminate the timeout from the reasons that causes the disc c3 errors?

Thanks in advance.



1 Rookie


143 Posts

August 3rd, 2021 00:00


Correct, there wasn’t any C3 discard due to timeout.

These c3 discards are probably related to “er_other_discard” or “er_unreachable” or “er_unroutable”.

See Knowledgebase article;

00037925 :

And the also check the output of the command portstatsshow in the supportshow that should show the other discards.





Ed Schulte


2 Posts

August 3rd, 2021 00:00

Thank you for the answer and the link.

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