Query on Catalyst 3750 outdiscards

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Nov 27th, 2013
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Hi,


I have seen outdiscard errors on almost all the interfaces on a 3750 switch,  The other counters are fine.  Please see example below


Port        Align-Err     FCS-Err    Xmit-Err     Rcv-Err  UnderSize  OutDiscards

Fa1/0/1             0           0           0           0          0         1973

Fa1/0/2             0           0           0           0          0         2510

Fa1/0/3             0           0           0           0          0           16

Fa1/0/4             0           0           0           0          0         2537

Fa1/0/5             0           0           0           0          0           60

Fa1/0/6             0           0           0           0          0         5234


The version on the switch is

Version 12.2(44)SE5


Is this a cosmetic bug or something else?


TIA.


PF

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Leo Laohoo Wed, 11/27/2013 - 17:18
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Post the output to the command "sh controller ether ".

pokwan Wed, 11/27/2013 - 17:24
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Leo,


Thanks for you reply.  Here the output on one of the interfaces.


Thanks.


PF



sh controllers ethernet-controller fa1/0/5

     Transmit FastEthernet1/0/5               Receive
   3168669192 Bytes                       3312837171 Bytes
     12135059 Unicast frames                10358331 Unicast frames
     12326652 Multicast frames                133105 Multicast frames
      9397857 Broadcast frames                 12765 Broadcast frames
            0 Too old frames              3281774438 Unicast bytes
            0 Deferred frames               26758791 Multicast bytes
            0 MTU exceeded frames            1632366 Broadcast bytes
            0 1 collision frames                   0 Alignment errors
            0 2 collision frames                   0 FCS errors
            0 3 collision frames                   0 Oversize frames
            0 4 collision frames                   0 Undersize frames
            0 5 collision frames                   0 Collision fragments
            0 6 collision frames
            0 7 collision frames             3798483 Minimum size frames
            0 8 collision frames              493527 65 to 127 byte frames
            0 9 collision frames             2517952 128 to 255 byte frames
            0 10 collision frames            2374205 256 to 511 byte frames
            0 11 collision frames             359315 512 to 1023 byte frames
            0 12 collision frames             960719 1024 to 1518 byte frames
            0 13 collision frames                  0 Overrun frames
            0 14 collision frames                  0 Pause frames
            0 15 collision frames
            0 Excessive collisions                 0 Symbol error frames
            0 Late collisions                      0 Invalid frames, too large
            0 VLAN discard frames                  0 Valid frames, too large
            0 Excess defer frames                  0 Invalid frames, too small
      5875378 64 byte frames                       0 Valid frames, too small
      7919321 127 byte frames
      8549995 255 byte frames                      0 Too old frames
      6586526 511 byte frames                      0 Valid oversize frames
       580647 1023 byte frames                     0 System FCS error frames
      4347701 1518 byte frames                     0 RxPortFifoFull drop frame
            0 Too large frames
            0 Good (1 coll) frames
            0 Good (>1 coll) frames

daniel.dib Wed, 11/27/2013 - 22:36
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You have a Gigabit uplink? The buffers on the Catalysts are quite small so when using different speeds you can see drops. Also if there is a lot of microbursting. Can you have a look at the show platform port-asic as well.



Daniel Dib
CCIE #37149

pokwan Thu, 11/28/2013 - 16:16
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Daniel,


Thanks for your reply.


Yes we do have GIgabit uplink.  The following is sh platform port-asic stats drop.  By the way, we have other Gig switches (WS-C3750E-48TD, version 12.2(58)SE2, no QoS ) with the same issue.


sh platform port-asic stats drop


Port-asic Port Drop Statistics - Summary
========================================
  RxQueue 0 Drop Stats: 0
  RxQueue 1 Drop Stats: 0
  RxQueue 2 Drop Stats: 0
  RxQueue 3 Drop Stats: 0

  Port  0 TxQueue Drop Stats: 0
  Port  1 TxQueue Drop Stats: 0
  Port  2 TxQueue Drop Stats: 2508
  Port  3 TxQueue Drop Stats: 904
  Port  4 TxQueue Drop Stats: 9276
  Port  5 TxQueue Drop Stats: 4902
  Port  6 TxQueue Drop Stats: 3013
  Port  7 TxQueue Drop Stats: 6004
  Port  8 TxQueue Drop Stats: 1038
  Port  9 TxQueue Drop Stats: 1420
  Port 10 TxQueue Drop Stats: 3128
  Port 11 TxQueue Drop Stats: 2200
  Port 12 TxQueue Drop Stats: 4582
  Port 13 TxQueue Drop Stats: 2296
  Port 14 TxQueue Drop Stats: 4809
  Port 15 TxQueue Drop Stats: 1684
  Port 16 TxQueue Drop Stats: 8599
  Port 17 TxQueue Drop Stats: 869
  Port 18 TxQueue Drop Stats: 9848
  Port 19 TxQueue Drop Stats: 3055
  Port 20 TxQueue Drop Stats: 2562
  Port 21 TxQueue Drop Stats: 682
  Port 22 TxQueue Drop Stats: 12466
  Port 23 TxQueue Drop Stats: 19
  Port 24 TxQueue Drop Stats: 0
  Port 25 TxQueue Drop Stats: 0

  Supervisor TxQueue Drop Statistics
    Queue  0: 0
    Queue  1: 0
    Queue  2: 0
    Queue  3: 0
    Queue  4: 0
    Queue  5: 0
    Queue  6: 0
    Queue  7: 0
    Queue  8: 509
    Queue  9: 0
    Queue 10: 0
    Queue 11: 0
    Queue 12: 0
    Queue 13: 0
    Queue 14: 0
    Queue 15: 0

..

(output truncated)


Thanks.


PF

Reuben Farrelly Thu, 11/28/2013 - 02:29
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That's not a particularly large number of output discards especially for that platform.  Do you have qos enabled on those ports by chance?

pokwan Thu, 11/28/2013 - 16:04
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Reuben,


Thanks for you reply.


Yes.  This what we configured on the interface

auto qos voip trust


Thanks.


PF

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