[c-nsp] Troubleshooting uncategorized output drops and errors on the 6500

[Richard Clayton]

John

Could your drops be due to microburst

On 26 July 2012 18:37, John Neiberger <jneiberger at gmail.com> wrote:

> I've got another strange issue brewing. We have a 1-gig interface on a
> 6500 (6748 blade) that has a high number of output errors and output
> drops. The drops are not queue drops. Here are the stats, one week
> after clearing the counters.
>
> Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops:
> 1158860
>   Queueing strategy: fifo
>   Output queue: 0/40 (size/max)
>   30 second input rate 854000 bits/sec, 101 packets/sec
>   30 second output rate 78000 bits/sec, 116 packets/sec
>      97152626 packets input, 115649666904 bytes, 0 no buffer
>      Received 0 broadcasts (0 multicasts)
>      0 runts, 0 giants, 0 throttles
>      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
>      0 watchdog, 0 multicast, 0 pause input
>      0 input packets with dribble condition detected
>      90216394 packets output, 7441734020 bytes, 0 underruns
>      579430 output errors, 0 collisions, 0 interface resets
>      0 babbles, 0 late collision, 0 deferred
>      0 lost carrier, 0 no carrier, 0 PAUSE output
>      0 output buffer failures, 0 output buffers swapped out
>
>
> Packets dropped on Transmit:
>
>     queue     dropped  [cos-map]
>     ---------------------------------------------
>     1                        0  [0 1 ]
>     2                        0  [2 3 4 ]
>     3                        0  [6 7 ]
>     4                        0  [5 ]
>
> I haven't been able to figure out what could be causing such a high
> rate of errors and drops. I have a TAC case open, but the engineer
> hasn't been able to explain what we're seeing. I'm probably just going
> to coordinate with the server and app owners to move this to another
> link, but I'm still very curious about what could cause this behavior.
>
> Any ideas?
>
> Thanks,
> John
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