Many Output Drops in a serial line

Discussion in 'Cisco' started by Dovelet, Jul 24, 2005.

  1. Dovelet

    Dovelet Guest

    Hi All,

    I have a question and I hope someone can help me. I have a pair of
    Cisco 2621XM routers that are installed in 2 sites and connected by a
    E1 leased line. In our environment, the Citrix traffics are the most
    critcal traffics so that I set the CBWFQ in both serial ports and
    configure it to have 70% of bandwidth for this traffics. Here are the
    configuration:

    ------------------------------------
    :
    class-map match-all ica_class
    match access-group 100
    !
    !
    policy-map ica_policy
    class ica_class
    bandwidth percent 70
    class class-default
    fair-queue
    !
    interface Serial0/1
    service-policy output ica_policy
    !
    :
    access-list 100 permit tcp any any eq 1494
    :
    -----------------------------------

    I suppose the Citrix traffics will have at least 70% of bandwidth.
    However, I found that there were many packet drops in the interface:

    ------------------------------------------------------------------
    Serial0/1 is up, line protocol is up
    Hardware is PowerQUICC Serial
    Internet address is x.x.x.x/30
    MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
    reliability 255/255, txload 149/255, rxload 12/255
    Encapsulation HDLC, loopback not set
    Keepalive set (10 sec)
    Last input 00:00:00, output 00:00:00, output hang never
    Last clearing of "show interface" counters 1d06h
    Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops:
    75890
    Queueing strategy: weighted fair
    Output queue: 0/1000/64/75890 (size/max total/threshold/drops)
    Conversations 0/146/256 (active/max active/max total)
    Reserved Conversations 1/1 (allocated/max allocated)
    Available Bandwidth 103 kilobits/sec
    30 second input rate 100000 bits/sec, 180 packets/sec
    30 second output rate 1304000 bits/sec, 207 packets/sec
    93030496 packets input, 2825911235 bytes, 0 no buffer
    Received 43090 broadcasts, 0 runts, 0 giants, 0 throttles
    1 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 1 abort
    81198918 packets output, 3082321637 bytes, 0 underruns
    0 output errors, 0 collisions, 0 interface resets
    0 output buffer failures, 0 output buffers swapped out
    0 carrier transitions
    DCD=up DSR=up DTR=up RTS=up CTS=up
    ------------------------------------------------------------------

    Router#show policy-map interface s0/1
    Serial0/1

    Service-policy output: ica_policy

    Class-map: ica_class (match-all)
    67471882 packets, 10015898781 bytes
    30 second offered rate 1050000 bps, drop rate 5000 bps
    Match: access-group 100
    Queueing
    Output Queue: Conversation 265
    Bandwidth 70 (%)
    Bandwidth 1433 (kbps) Max Threshold 64 (packets)
    (pkts matched/bytes matched) 19586022/5141810742
    (depth/total drops/no-buffer drops) 0/73390/0

    Class-map: class-default (match-any)
    13819195 packets, 5996917160 bytes
    30 second offered rate 340000 bps, drop rate 0 bps
    Match: any
    Queueing
    Flow Based Fair Queueing
    Maximum Number of Hashed Queues 256
    (total queued/total drops/no-buffer drops) 0/2743/0
    ------------------------------------------------------------

    As you can see in the "Show policy interface" output, there is only
    1.3Mbps in the E1 (2Mbps) link but the output packets were started to
    drop. Moreover, the drop rate of the "ica_policy" group is much higher
    than the "default group". Does anyone know why? Thanks.

    Regards,
    Dovelet
    Dovelet, Jul 24, 2005
    #1
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