qos drops

Mahesh Gohil · ‎02-26-2013

    Class-map: OUT-D2 (match-any)
      539356910 packets, 325889646562 bytes
      30 second offered rate 42671000 bps, drop rate 17000 bps
      Match: dscp cs1 (8) cs2 (16) af21 (18)
        536438382 packets, 322108692745 bytes
        30 second rate 42635000 bps
      Match: dscp af22 (20)
        2918528 packets, 3780953817 bytes
        30 second rate 34000 bps
      Queueing
      queue limit 4096 packets
      (queue depth/total drops/no-buffer drops) 0/3985/0
      (pkts output/bytes output) 8222362/4599852751
      bandwidth 42% (60628 kbps)
        Exp-weight-constant: 9 (1/512)
        Mean queue depth: 0 packets
        dscp       Transmitted         Random drop      Tail drop          Minimum        Maximum     Mark
                pkts/bytes            pkts/bytes       pkts/bytes          thresh         thresh     prob

        default            0/0               0/0              0/0              65535         65535 1/0
        18           8219005/4596177374   1399/1292911     2582/2808676          807          1614 1/20
        20              3358/3675452         0/0              4/2303             449           898 1/20

Hello,

Looking at about bold output just want to know what this interface is dropping packets even though bandwidth is availabe (17000bps of drops and curent rate is around 42meg out of allowed 42% (around 60meg).

Basically this interface is facing toward customer and this output is for one of the class for which customer has complaint. Just want o know the reasons of drops even if utilization is less than allowed.

Regards

Mahesh

Joseph W. Doherty · ‎02-26-2013

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Posting

From the stats, you seem to be getting WRED drops, both random and tail drops. If your traffic is bursty, you can have drops during the bursts.

francisco_1 · ‎02-26-2013

it's normal to see some level of drops expecically when you have applications that create bursty traffic and take in tou consideration you're are buffering.