TS for 6748 output drop

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When you found have output queue drop for CEF720 LC, you can check follow step:
1. which port have issue, whether at same ASIC.
2. check whether have other error or have qos on issue port.
3. whether hw queue is full.

Follow is TS example:

Problem description:

Output queue have drop
1. After checked by follow command:
– show tech
– show inter switching x/x
– show int x/x counter de
– show inter x/x summary

Found not one ASIC have issue (6748 is one ASCI each 12 port).
Only one vlan have issue, but traffics not amount.

2. Suspect burst traffics lead to queue full, check by follow command
– show queueing int gx/x

Found customer config mls qos, and packets drop at queue1.
(At 6748, Tx port buffer is 1.164MB)

7609#show queueing int g7/14
Interface GigabitEthernet9/13 queueing strategy:  Weighted Round-Robin
  Port QoS is enabled
  Port is untrusted
  Extend trust state: not trusted [COS = 0]
  Default COS is 0
    Queueing Mode In Tx direction: mode-cos
    Transmit queues [type = 1p3q8t]:
    Queue Id    Scheduling  Num of thresholds
    -----------------------------------------
       01         WRR                 08
       02         WRR                 08
       03         WRR                 08
       04         Priority            01

    WRR bandwidth ratios:  100[queue 1] 150[queue 2] 200[queue 3]
    queue-limit ratios:     50[queue 1] 20[queue 2] 15[queue 3] 15[Pri Queue]

  Packets dropped on Transmit:
    queue     dropped  [cos-map]
    ---------------------------------------------
    1 3333 [0 1 ]
    2                        0  [2 3 4 ]
    3                        0  [6 7 ]
    4                        0  [5 ]

Base on the information, Queue1 only have 100/(100+150+200)=22% WRR bandwidth.
And queue-limit only have 50%.
( Refer to wrr bandwidth and queue-limit, please reference <Catalyst QOS Campus Network> )
So change wrr queue or no mls qos.
After no mls qos, found drop not disappear, all queue resources in queue1.
And found have burst in issue vlan.

YZ_iTV2.0_R1.C7609_A#show queueing interface g9/13
Interface GigabitEthernet9/13 queueing strategy:  Weighted Round-Robin
  QoS is disabled globally
  Trust state: trust DSCP
  Extend trust state: not trusted [COS = 0]
  Default COS is 0
    Queueing Mode In Tx direction: mode-cos
    Transmit queues [type = 1p3q8t]:
    Queue Id    Scheduling  Num of thresholds
    -----------------------------------------
       01         WRR                 08
       02         WRR                 08
       03         WRR                 08
       04         Priority            01
    WRR bandwidth ratios:  100[queue 1] 0[queue 2] 0[queue 3]
    queue-limit ratios:    100[queue 1] 0[queue 2] 0[queue 3] 0[Pri Queue]

  Packets dropped on Transmit:
    queue     dropped  [cos-map]
    ---------------------------------------------
    1 2499 [0 1 2 3 4 5 6 7 ]
    2                        0  []
    3                        0  []
    4                        0  []

Follow is information that check port buffer:

(config-if)#do remote command switch show qm port 6 2

-----------------------------------------------------------------------------
* Type: Tx[1p2q2t] Rx[1p1q4t]  [0] Pinnacle
* Per-Port: [Untrusted] Default COS[0] force[0] [VLAN based]
-----------------------------------------------------------------------------
* COSMAP(C[Q/T]) TX: 0[1/1] 1[1/1] 2[1/2] 3[1/2] 4[2/1] 5[3/1] 6[2/1] 7[2/2]
                 RX: 0[1/1] 1[1/1] 2[1/1] 3[1/1] 4[1/1] 5[1/1] 6[1/1] 7[1/1]
-----------------------------------------------------------------------------
* WRR bandwidth:        [25344 544]
* TX queue limit(size): [409600 16384 16384]
* WRED queue[1]:        wredLowThr[163840 286720] wredThr[286720 409472] rndNumber[0]
                        AveWeight[128] SampleCntr[255] PktCntr[0] QFreecnt[1073746944]
       queue[2]:        wredLowThr[6553 11468] wredThr[11520 12288] rndNumber[0]
                        AveWeight[128] SampleCntr[255] PktCntr[0] QFreecnt[1073741824]
-----------------------------------------------------------------------------
* TX drop thr queue[1]: type[2 QOS_SCP_2_THR] dropThr[286720 409472]
              queue[2]: type[2 QOS_SCP_2_THR] dropThr[11520 12288]
* RX drop threshold:    type[4 QOS_SCP_4_THR] dropThr[65536 65536 65536 65536]
* RXOvr drop threshold: type[20 UNSUPPORTED]
* TXOvr drop threshold: type[20 UNSUPPORTED]
本文出自 Frank's Blog

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