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Query on Catalyst 3750 outdiscards

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

6 REPLIES
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Query on Catalyst 3750 outdiscards

Post the output to the command "sh controller ether ".

Community Member

Query on Catalyst 3750 outdiscards

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

Query on Catalyst 3750 outdiscards

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

Daniel Dib CCIE #37149 Please rate helpful posts.
Community Member

Query on Catalyst 3750 outdiscards

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

Query on Catalyst 3750 outdiscards

That's not a particularly large number of output discards especially for that platform.  Do you have qos enabled on those ports by chance?

Community Member

Query on Catalyst 3750 outdiscards

Reuben,

Thanks for you reply.

Yes.  This what we configured on the interface

auto qos voip trust

Thanks.

PF

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