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Configuration Guide - Device Management

S9300, S9300E, and S9300X V200R012C00

This document describes the configurations of Device Management, including device status query, hardware management, CSS, SVF, PoE, OPS, OIDS, energy-saving management, information center, fault management, NTP, synchronous ethernet, PTP.
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Configuring OIDS to Troubleshoot Ping Packet Loss Caused by Exceeding CPCAR Limit

Configuring OIDS to Troubleshoot Ping Packet Loss Caused by Exceeding CPCAR Limit

Fault Symptom

The NMS occasionally reports switch disconnections, and packet loss occurs when the switch pings a directly connected peer device or another device pings the switch.

NOTE:

OIDS can be used to troubleshoot only the faults that occur after the OIDS monitoring and diagnosis functions are enabled on the switch.

Procedure

  1. For a dual-MPU or cluster switch, run the collect oids database file to system-master command in the system view to save OIDS database files to the active MPU.
  2. Run the display oids monitor current-fault command in any view to check OIDS monitoring information that triggers abnormal events at the current time.

    The following example output shows that CPCAR_Drop_Pkt is abnormal, indicating that packets were lost due to exceeding the CPCAR limit.

    <Quidway> display oids monitor current-fault
    Slot Type-name  Object-name         Attribute-name      Status
    -----------------------------------------------------------------
    5    CPU-CHAN   CPCAR               CPCAR_Drop_Pkt      Abnormal
    

  3. Run the display oids current-event command in any view to check information about the OIDS events generated after the switch starts.

    The following example output shows that packets were lost due to exceeding the CPCAR limit and the time when packet loss occurred.

    <Quidway> display oids current-event
      Slot: 5
    ------------------------------------------------
    Event name    : CPCAR Drop Pkt
    Object name   : CPCAR
    Attribute name: CPCAR_Drop_Pkt
    State value   : 10
    Begin time    : 2018-03-27 23:45:21
    End time      : 2018-03-27 23:45:21
    ------------------------------------------------
    
    Info: At most 100 events that have been processed since each board starts can be displayed for this board. All events that have not been processed will also be displayed. 

  4. Run the display oids history-result command in any view to check OIDS diagnosis results on the switch.

    The following example output shows that packets were lost due to exceeding the CPCAR limit. The majority of dropped packets are ICMP packets.

    <Quidway> display oids history-result
    ----------------------------------------------------------------------
    Slot               : 5
    ObjectName         : CPCAR
    AttrName           : CPCAR_Drop_Pkt
    Event              : CPCAR Drop Pkt
    Event time         : 2018-03-27 23:45:21
    Diagnose begin time: 2018-03-27 23:45:21
    Diagnose end time  : 2018-03-27 23:45:21
    Record             : Packets are discarded for CPCAR limit, the top protocols are:Protocol = icmp, ExceededPacketCount = 16061939.
    State value        : 16061939
    ----------------------------------------------------------------------
    

  5. Adjust the CPU attack defense configuration on the switch. After a while, run the display oids monitor current-fault command to check whether the fault is rectified.
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Updated: 2018-09-03

Document ID: EDOC1100038289

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