PKT_OUTDISCARD_ABNL On S6720

Latest reply: Jul 22, 2019 15:15:37 153 3 0 0

Hi,


I have no qos , rate limit or bandwith limit on any of the interfaces of my switch but i get messages like the one below several times a day.


May  6 14:13:28+01:00 EC4A2 %%01IFPDT/4/PKT_OUTDISCARD_NL(l)[1]:Interface output discard restored to the log threshold. (Interface=XGigabitEthernet1/0/1, Statistics=63243, LogThreshold=300, LogInterval=300(s),PortQueueNumber=0, PortQueuePassed=11083800, PortQueueDropped=63243, PortQueueNumber=1, PortQueuePassed=16984, PortQueueDropped=0,PortQueueNumber=2, PortQueuePassed=421, PortQueueDropped=0, PortQueueNumber=3, PortQueuePassed=10, PortQueueDropped=0,PortQueueNumber=4, PortQueuePassed=6275, PortQueueDropped=0, PortQueueNumber=5, PortQueuePassed=402, PortQueueDropped=0,PortQueueNumber=6, PortQueuePassed=7809234, PortQueueDropped=0, PortQueueNumber=7, PortQueuePassed=1009726, PortQueueDropped=0)

May  6 14:08:27+01:00 EC4A2 %%01IFPDT/4/PKT_OUTDISCARD_ABNL(l)[2]:Interface output discard exceeded the log threshold. (Interface=XGigabitEthernet1/0/1, Statistics=63243, LogThreshold=300, LogInterval=300(s),PortQueueNumber=0, PortQueuePassed=536341778, PortQueueDropped=63243, PortQueueNumber=1, PortQueuePassed=16984, PortQueueDropped=0,PortQueueNumber=2, PortQueuePassed=421, PortQueueDropped=0, PortQueueNumber=3, PortQueuePassed=10, PortQueueDropped=0,PortQueueNumber=4, PortQueuePassed=6275, PortQueueDropped=0, PortQueueNumber=5, PortQueuePassed=402, PortQueueDropped=0,PortQueueNumber=6, PortQueuePassed=7807077, PortQueueDropped=0, PortQueueNumber=7, PortQueuePassed=1009394, PortQueueDropped=0)


I also recieve the same message on some of the other ports but this one its the one that appears more offten and the discated packets are bound to be a problem.


This is the configuration of the port and the eth-trunk.


#

interface XGigabitEthernet1/0/1

 eth-trunk 1

#

return


interface Eth-Trunk1

 description Ligação ManPD

 port link-type trunk

 port trunk allow-pass vlan 100 110 200 600

#

XGigabitEthernet1/0/1 current state : UP

Line protocol current state : UP

Description:"OperatorConneciton"

Switch Port, Link-type : trunk(configured),

PVID :    1, TPID : 8100(Hex), The Maximum Frame Length is 9216

IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 60f1-8a54-4719

Last physical up time   : 2019-04-24 22:06

Last physical down time : 2019-04-24 22:06

Current system time: 2019-04-24 22:06+01:00

Port Mode: COMMON FIBER, Transceiver: 1000_BASE_LX_SFP

Speed : 1000,   Loopback: NONE

Duplex: FULL,   Negotiation: ENABLE

Mdi   : -,      Flow-control: DISABLE

Last 300 seconds input rate 235474296 bits/sec, 36532 packets/sec

Last 300 seconds output rate 138871320 bits/sec, 41397 packets/sec

Input peak rate 999985552 bits/sec, Record time: 2019-04-24 22:06

Output peak rate 999867872 bits/sec, Record time: 2019-04-24 22:06


Input:  6057306021 packets, 4323734605986 bytes

  Unicast:                 6030478993,  Multicast:                     8371476

  Broadcast:                 18455552,  Jumbo:                               0

  Discard:                          0,  Pause:                               0

  Frames:                           0


  Total Error:                      0

  CRC:                              0,  Giants:                              0

  Runts:                            0,  DropEvents:                          0

  Alignments:                       0,  Symbols:                             0

  Ignoreds:                         0


Output:  6492796396 packets, 4434089763740 bytes

  Unicast:                 6458016491,  Multicast:                    17635273

  Broadcast:                 17144632,  Jumbo:                               0

  Discard:                      64111,  Pause:                               0


  Total Error:                      0

  Collisions:                       0,  Late Collisions:                     0

  Deferreds:                        0


    Input bandwidth utilization threshold : 80.00%

    Output bandwidth utilization threshold: 80.00%

    Input bandwidth utilization  : 23.55%

    Output bandwidth utilization : 13.89%


Eth-Trunk1 current state : UP

Line protocol current state : UP

Description:OperatorConnection

Switch Port, Link-type : trunk(configured),

PVID :    1, Hash arithmetic : According to SIP-XOR-DIP,Maximal BW: 1G, Current BW: 1G, The Maximum Frame Length is 9216

IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 60f1-8a54-4719

Current system time: 2019-04-24 22:06+01:00

Last 300 seconds input rate 243650408 bits/sec, 33681 packets/sec

Last 300 seconds output rate 159003248 bits/sec, 32520 packets/sec

Input:  6051872402 packets, 4320294617936 bytes

  Unicast:                 6025049835,  Multicast:                     8369900

  Broadcast:                 18452667,  Jumbo:                               0

  Discard:                          0,  Pause:                               0

  Frames:                           0


  Total Error:                      0

  CRC:                              0,  Giants:                              0

  Runts:                            0,  DropEvents:                          0

  Alignments:                       0,  Symbols:                             0

  Ignoreds:                         0


Output:  6485136358 packets, 4431475935197 bytes

  Unicast:                 6450365207,  Multicast:                    17630587

  Broadcast:                 17140564,  Jumbo:                               0

  Discard:                      64111,  Pause:                               0


  Total Error:                      0

  Collisions:                       0,  Late Collisions:                     0

  Deferreds:                        0


    Input bandwidth utilization  : 24.37%

    Output bandwidth utilization : 15.90%

-----------------------------------------------------

PortName                      Status      Weight

-----------------------------------------------------

XGigabitEthernet1/0/1         UP          1

-----------------------------------------------------

The Number of Ports in Trunk : 1

The Number of UP Ports in Trunk : 1


Anyone else has any info on how to prevent the packets from being discarted?


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Popeye_Wang
Admin Created May 7, 2019 03:10:57 Helpful(0) Helpful(0)

Hi there!

Through the information you provide, crc=0 indicates that the physical link is normal and the traffic is normal. The most probable cause is burst traffic. You can use the packet capture software to check whether burst traffic exists (for example, the statistics function of Wireshark).

If you confirm that burst traffic does exist, you can try two ways:

1. Configuring the burst mode of the interface cache management in enhanced mode.

By default, the buffer size on an interface is small. When the traffic rate on an interface reaches 50% to 60% of the interface bandwidth, packets are lost on the interface. The burst traffic buffer mode enables an interface to occupy more available buffer space in the system to process burst traffic, so that the  congestion and packet loss will be reduced.

<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 1/0/1
[HUAWEI-GigabitEthernet1/0/1] qos burst-mode enhanced

2. Configuring Traffic Shaping.

Traffic shaping adjusts the rate of outgoing traffic to reduce traffic bursts so that outgoing packets can be transmitted at a stable rate.
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AGregory
AGregory Created Jul 24, 2019 02:04:07
Just to confirm @Popeye_Wang , even if all is working normally, traffic can be dropped if the interface reaches around 50/60% just because of the the buffer size ?  
Petete
Created Jul 22, 2019 15:15:37 Helpful(0) Helpful(0)

I had the same problem on a S5720 switch.
The port was configured to auto negotiation and linking 100-half while the other side was forced to 100-full, with many packets discarded due to configuration mismatch.
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