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Thread: output drops

  1. Senior Member
    Join Date
    Oct 2009


    Default output drops

    Hi, I have a access switch with a 10gb upstream interface and a 1gb downstream interface, i can see from the show interfaces [int] that traffic is being dropped on the upstream downstream direction.

    TenGigabitEthernet1/1 is up, line protocol is up (connected)
    Hardware is Ten Gigabit Ethernet Port, address is f4cf.e213.7e30 (bia f4cf.e213.7e30)
    Description: MATE.A01
    MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
    reliability 255/255, txload 5/255, rxload 1/255
    Encapsulation ARPA, loopback not set
    Keepalive set (10 sec)
    Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseSX
    input flow-control is on, output flow-control is on
    ARP type: ARPA, ARP Timeout 04:00:00
    Last input 00:00:45, output never, output hang never
    Last clearing of "show interface" counters never
    Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 7556661
    Queueing strategy: Class-based queueing
    Output queue: 0/40 (size/max)
    5 minute input rate 5364000 bits/sec, 1098 packets/sec
    5 minute output rate 22402000 bits/sec, 2980 packets/sec
    863690200 packets input, 401065551603 bytes, 0 no buffer
    Received 6568826 broadcasts (1428513 multicasts)
    0 runts, 0 giants, 0 throttles
    0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
    0 input packets with dribble condition detected
    2787171938 packets output, 1962145408543 bytes, 0 underruns
    0 output errors, 0 collisions, 4 interface resets
    0 unknown protocol drops
    0 babbles, 0 late collision, 0 deferred
    0 lost carrier, 0 no carrier
    0 output buffer failures, 0 output buffers swapped out
    Most probably the cause of these drops are due to the fact that the traffic is comming from a higher bandwitdh interface to a lower bandwith one. the buffer gets full quickly and the switch as to discard some packets.

    Is there a command where i can see the packet drops at a buffer level? Are there more causes for output drops? how can i troubleshoot these output drops more in detail?

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  2. Senior Member
    Join Date
    Apr 2015

    CCNA R&S, Security+, Network+, Linux+, Linux Essentials
    I think "sh buffers" will give you that information.
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