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ME60 Troubleshooting Guide V1.0 (VRPv8)

This document provides the maintenance guide of the device, including daily maintenance, emergence maintenance, and typical troubleshooting.
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IP Hard Pipe Troubleshooting

IP Hard Pipe Troubleshooting

This chapter describes common causes of IP Hard Pipe faults and provides the corresponding troubleshooting flowcharts, troubleshooting procedures, alarms, and logs.

High Hard Pipe VLL Service Delay

This section describes how to troubleshoot high hard pipe VLL service delay.

Common Causes

Common causes are as follows:

  • A physical link or transmission device fails.
  • The total access bandwidth for hard pipe VLL services on a public network interface exceeds the hard pipe bandwidth of this interface.
  • Downstream traffic congestion occurs for VLL services on an AC interface.
Troubleshooting Flowchart

Figure 4-107 shows the troubleshooting flowchart.

Figure 4-107 Flowchart for troubleshooting high hard pipe VLL service delay

Troubleshooting Procedure
NOTE:
Save the results of each troubleshooting step. If the fault persists after following this procedure, Huawei will need these results for further troubleshooting.

Procedure

  1. Check that links between VLL service nodes are working properly.

    Ping a VLL service node on one end of a link from the node on the other end to check whether the link is working properly.
    • If the ping operation fails, the physical link is not working properly. Rectify the link fault.
    • If the ping operation succeeds, the physical link is working properly. Then go to Step 2.

  2. Use either of the following methods to check whether the hard pipe traffic rate exceeds the specified hard pipe bandwidth.

    • Check hard pipe bandwidth usage alarms to see if a hard pipe bandwidth usage alarm has been generated for any node or public network interface.
    • Use uTraffic to measure link delay segment by segment to locate the link with high delay. Then check the hard pipe traffic rate of this link.

      Run the display qos hard-pipe statistics interface interface interface-type outbound command to check whether the hard pipe traffic rate of the link with high delay exceeds the specified hard pipe bandwidth.
      <HUAWEI> display qos hard-pipe statistics interface gigabitethernet2/0/0 outbound
      GigabitEthernet2/0/0 outbound traffic statistics:
      Total pass:
                                         0 packets,                          0 bytes
      Total discard:
                                         0 packets,                          0 bytes
      Last 30 seconds pass rate:
                                         0 pps,                              0 bps
      Last 30 seconds discard rate:
                                         0 pps,                              0 bps 
    • If a hard pipe bandwidth usage alarm has been generated or packet loss is displayed in the hard pipe statistics, the hard pipe traffic rate exceeds the specified hard pipe bandwidth, which causes traffic congestion. In this case, increase the hard pipe bandwidth.
    • If no hard pipe bandwidth usage alarm has been generated or no packet loss is displayed in the hard pipe statistics, go to Step 3.

  3. Check that no downstream traffic congestion occurs on the AC interface for VLL services.

    Run the display interface brief main command and check whether downstream traffic congestion occurs on the AC interface for VLL services.
    <HUAWEI> display interface brief main
    PHY: Physical
    *down: administratively down
    ^down: standby
    (l): loopback
    (s): spoofing
    (b): BFD down
    (B): bit-error-detection down(d): Dampening Suppressed
    InUti/OutUti: input utility/output utility
    InterfacePHY      Protocol  InUti  OutUti  inErrors   outErrors
    Eth-Trunk0                        down     down      7%     12%     0          0
    GigabitEthernet2/0/0              up       up        50%    60%     23         125
    GigabitEthernet2/0/1              *down    down      40%    30%     0          0
    • If the downstream traffic rate reaches 100% of the interface bandwidth, traffic congestion has occurred. In this case, reduce the traffic volume.
    • If the downstream traffic rate does not reach 100% of the interface bandwidth, no traffic congestion occurs. Then go to Step 4.

  4. Check that no high-priority soft pipe traffic exists on the AC interface.

    Run the display port-queue statistics command and check whether high-priority soft hard pipe traffic exists.

    <HUAWEI> display port-queue statistics interface gigabitethernet 2/0/1 cs7 outbound
    [cs7]
    Current usage percentage of queue: 0
    Total pass:
                   670,708 packets,                 63,046,458 bytes
    Total discard:
                   0 packets,                          0 bytes
    Drop tail discard:
                   0 packets,                          0 bytes
    Wred discard:
                   0 pps,                              0 bps
    Last 30 seconds pass rate:
                   33,599 pps,                     3,158,306 bps
    Last 30 seconds discard rate:
                    0 pps,                              0 bps
    Drop tail discard rate:
                    0 pps,                              0 bps
    Wred discard rate:
                    0 pps,                              0 bps
    Peak rate:
                    0000-00-00 00:00:00                       0 bps
    • If the Total pass field value in [cs7] is not 0, high-priority soft pipe traffic exists. In this case, decrease the priority of the soft pipe traffic.
    • If the Total pass field value in [cs7] is 0, no high-priority soft pipe traffic exists. Then go to Step 5.

  5. Collect the following information and contact technical support personnel.

    • Results of the preceding troubleshooting procedure
    • Configuration files, log files, and alarm files of the devices

Relevant Alarms and Logs
Relevant Alarms

QOS_1.3.6.1.4.1.2011.5.25.32.4.1.11.19 hwXQoSHardPipeAlarm

QOS_1.3.6.1.4.1.2011.5.25.32.4.1.11.20 hwXQoSHardPipeAlarmClear

Relevant Logs

None

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Updated: 2019-06-11

Document ID: EDOC1000175918

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