Too many discards on interface 10GE

Created: Mar 25, 2019 18:57:46Latest reply: Mar 26, 2019 14:23:43 252 2 0 0
  Rewarded Hi-coins: 0 (problem resolved)

Hello!We have a two CE6880-24S4Q2CQ-EI switches installed and we are seeing discarded packet on 10GE interfaces (between switches and connected servers), although the links are not fully loaded.

<HW1>display interface 10GE 1/0/12
10GE1/0/12 current state : UP (ifindex: 16)
Line protocol current state : UP
Switch Port, PVID :    1, TPID : 8100(Hex), The Maximum Frame Length is 9216
Internet protocol processing : disabled
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is a4be-2b09-xxxx
Port Mode:     COMMON FIBER,     Port Split/Aggregate:         DISABLE
Speed:                10000,     Loopback:                        NONE
Duplex:                FULL,     Negotiation:                  DISABLE
Input Flow-control: DISABLE,     Output Flow-control:          DISABLE
Mdi:                      -,     Fec:                             NONE
Last physical up time   : 2019-01-21 14:54+03:00
Last physical down time : 2019-01-21 14:54+03:00
Current system time: 2019-01-21 14:54+03:00
Statistics last cleared:2019-01-21 14:54+03:00
    Last 300 seconds input rate: 62588928 bits/sec, 6921 packets/sec
    Last 300 seconds output rate: 70494505 bits/sec, 7872 packets/sec
    Input peak rate 104529722 bits/sec, Record time: 2019-01-21 14:54+03:00
    Output peak rate 143899302 bits/sec, Record time: 2019-01-21 14:54+03:00
    Input :        14360427480 bytes,           12670107 packets
    Output:        21399136744 bytes,           17577164 packets
      Unicast:               12661977,   Multicast:                    1937
      Broadcast:                 6193,   Jumbo:                     8491287
      Discard:                      0,   Frames:                          0
      Pause:                        0
      Total Error:                  0
      CRC:                          0,   Giants:                          0
      Jabbers:                      0,   Fragments:                       0
      Runts:                        0,   DropEvents:                      0
      Alignments:                   0,   Symbols:                         0
      Ignoreds:                     0
      Unicast:               17555265,   Multicast:                   12699
      Broadcast:                 9200,   Jumbo:                    13076063
      Discard:                   9040,   Buffers Purged:                  0
      Pause:                        0

    Input bandwidth utilization threshold : 90.00%
    Output bandwidth utilization threshold: 90.00%
    Last 300 seconds input utility rate:  0.62%
    Last 300 seconds output utility rate: 0.70% We are make QOS settings on interface, as recommended on huawei forum, but no effect. interface 10GE1/0/12
 port link-type trunk
 undo port trunk allow-pass vlan 1
 port trunk allow-pass vlan 4, 5, 6
 qos burst-mode enhanced
 device transceiver 10GBASE-FIBER

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Created Mar 25, 2019 19:19:07 Helpful(0) Helpful(0)

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Network & Security Engineer
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Mohamed_Mostafa Created Mar 25, 2019 19:19:07 Helpful(0) Helpful(0)

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Network & Security Engineer
chenhui Admin Created Mar 26, 2019 14:23:43 Helpful(0) Helpful(0)

@serge_s76 hello,
from the output of the command display, the output discard means the packets discarded by the interface during physical layer detection due to queue congestion,
it seems that the burst traffic has exceed the buffer size.
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