Too many discards on interface 10GE

Created: Mar 25, 2019 10:57:46Latest reply: Aug 29, 2019 05:46:59 384 3 1 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 06:54+03:00
Last physical down time : 2019-01-21 06:54+03:00
Current system time: 2019-01-21 06:54+03:00
Statistics last cleared:2019-01-21 06:54+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 06:54+03:00
    Output peak rate 143899302 bits/sec, Record time: 2019-01-21 06:54+03:00
    Input :        14360427480 bytes,           12670107 packets
    Output:        21399136744 bytes,           17577164 packets
    Input:
      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
    Output:
      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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Mohamed_Mostafa
Created Mar 25, 2019 11:19:07 Helpful(1) Helpful(1)

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Network%20%26%20Security%20Engineer
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Mohamed_Mostafa
Mohamed_Mostafa Created Mar 25, 2019 11:19:07 Helpful(1) Helpful(1)

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Network%20%26%20Security%20Engineer
chenhui
chenhui Admin Created Mar 26, 2019 06:23:43 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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user_3534923
user_3534923 Created Aug 29, 2019 05:46:59 Helpful(0) Helpful(0)

<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   : 2019-01-20 22:54+03:00 Last physical down time : 2019-01-20 22:54+03:00 Current system time: 2019-01-20 22:54+03:00 Statistics last cleared:2019-01-20 22:54+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: 2019-01-20 22:54+03:00     Output peak rate 143899302 bits/sec, Record time: 2019-01-20 22:54+03:00     Input :        14360427480 bytes,           12670107 packets     Output:        21399136744 bytes,           17577164 packets [align=(left|center|right)] 
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