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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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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Clock Synchronization Troubleshooting

Clock Synchronization Troubleshooting

This chapter describes common causes of clock synchronization faults and provides troubleshooting flowcharts and procedures, alarms, and logs to help identify and rectify these faults.

An Interface Clock Source Cannot Be a Candidate System Clock Source

This section describes how to troubleshoot system clock source selection faults.

Common Causes
Common causes are as follows:
  • Automatic selection of a system clock source is disabled.
  • Synchronization Status Message (SSM) control is disabled.
  • The clock source priority is not configured on the interface.
  • Interface clock synchronization is disabled.
Troubleshooting Procedure

NOTE:

After the commands are configured to troubleshoot the faults, check the configuration validation mode to ensure that the configurations take effect. Unless otherwise specified, this manual defaults to immediate validation mode.

  • In immediate validation mode, the configurations take effect after the commands are entered.
  • In two-phase validation mode, after the commands are configured, the commit command needs to be run to commit the configurations.

Save the results of each troubleshooting step so that if your troubleshooting attempts fail to correct the fault, you will have a record of your actions to present to Huawei.

Procedure

  1. Check that the interface and link are working properly.

    Check whether the interface and link are working properly. If any of them is faulty, troubleshoot this fault. For detailed troubleshooting procedures, see "Physical Interconnection Troubleshooting." If the interface and link are working properly, go to Step 2.

  2. Check that SSM control is in the on state.

    SSM control needs to be configured only when the system selects a clock source based on the quality of clock signals. If SSM control is unrequired, go to Step 3.

    To check whether SSM control is in the on state, run the display clock config command.

    • If SSM control is in the off state, but the system must select a clock source based on the quality of clock signals, run the clock ssm-control on command in the system view to enable SSM control.

    • If SSM control is in the on state, check that the input SSM level on the interface is not dnu. (The SSM level can be output by the upstream device or configured on the interface using the clock ssm ssm-level command.) If the problem persists, go to Step 3.

  3. Check that the interface configuration is correct.

    Run the display clock config command to check whether Sync enable is displayed in the command output and whether Pri is configured.

    • If Sync enable is not displayed in the command output (clock synchronization is disabled), run the clock synchronization enable command in the interface view to enable clock synchronization on the interface.

    • If Pri is not configured (a clock source priority is not configured on the interface), run the clock [ 2msync-1 | 2msync-2 ] priority priority-value command in the interface view to configure a clock source priority.

    NOTE:

    After the configuration, run the display this command to check the configuration.

    If the problem persists, go to Step 4.

  4. Contact Huawei and provide the following information:

    • Results of this troubleshooting procedure

    • Configuration, log, and alarm files

Relevant Alarms and Logs

Relevant Alarms

None

Relevant Logs

None

The SSM Level Received by an Ethernet Interface Is Different from That Sent by a Remote Interface

This section describes how to troubleshoot SSM level inconsistency faults.

Common Causes

The display clock source command output shows that the SSM level received by the Ethernet interface is different from the SSM level output by the Ethernet interface's peer interface.

Common causes are as follows:

  • The SSM level of the Ethernet interface is forcibly configured.
  • The intermediate devices, such as switches and WDM devices, discard SSMs.
Troubleshooting Procedure

Context

NOTE:

After the commands are configured to troubleshoot the faults, check the configuration validation mode to ensure that the configurations take effect. Unless otherwise specified, this manual defaults to immediate validation mode.

  • In immediate validation mode, the configurations take effect after the commands are entered.
  • In two-phase validation mode, after the commands are configured, the commit command needs to be run to commit the configurations.

Save the results of each troubleshooting step so that if your troubleshooting attempts fail to correct the fault, you will have a record of your actions to present to Huawei.

Procedure

  1. Check that the SSM level is configured on the interface.

    Run the display clock config command in any view to check information about the SSM level of the clock source on the interface.

    If the SSM level of the clock source is configured, the configured clock source SSM level, not the clock source SSM level output by the peer, takes effect on the interface.

    If the interface does not support SSMs but its clock source needs to be a candidate system clock source, the SSM level must be configured on this interface.

    • In this case, it is possible that the SSM level configured on the interface is different from the clock source SSM level output by the peer. This is a normal situation, and no action is required.

    • If the interface supports SSMs and is configured with the SSM level, run the undo clock ssm command in the interface view to delete the configured clock source SSM level.

    • If the interface supports SSMs and is not configured with the SSM level, but the problem persists, go to next step.

  2. Check that the interface properly receives clock synchronization packets from its peer.

    If the interface does not receive clock synchronization packets from its peer, check whether the problem occurs for either of the following reasons:

    • The peer cannot send clock synchronization packets.
    • The link is faulty. As a result, clock synchronization packets cannot arrive at the interface.
    • Devices do not support clock synchronization.

    If neither of the preceding conditions is met, but the problem persists, go to next step.

  3. Contact Huawei and provide the following information:

    • Results of this troubleshooting procedure

    • Configuration, log, and alarm files

Relevant Alarms and Logs

Relevant Alarms

None

Relevant Logs

None

The Clock Source with the Highest SSM Level Cannot Be Selected as the System Clock Source

This section describes how to troubleshoot clock source selection faults.

Common Causes

The display clock source command output shows that the clock source with the highest SSM level is not selected as the system clock source.

Common causes are as follows:
  • If SSM participates in system clock source selection:

    • SSM control is disabled.
    • The system clock source is manually or forcibly selected.
  • If the system clock source is selected based on the priorities of the interface clock sources:

    • The priority of the clock source with the highest SSM level is low.
Troubleshooting Procedure

NOTE:

After the commands are configured to troubleshoot the faults, check the configuration validation mode to ensure that the configurations take effect. Unless otherwise specified, this manual defaults to immediate validation mode.

  • In immediate validation mode, the configurations take effect after the commands are entered.
  • In two-phase validation mode, after the commands are configured, the commit command needs to be run to commit the configurations.

Save the results of each troubleshooting step so that if your troubleshooting attempts fail to correct the fault, you will have a record of your actions to present to Huawei.

Procedure

  1. Perform the following steps based on the clock source selection mode:

    1. If SSM participates in system clock source selection, run the display clock config command to view the SSM control status.

      • If SSM control is in the off state, run the clock ssm-contro lon command in the system view to enable SSM control.

      • If SSM control is in the on state, but the problem persists, go to Step b.

    2. Run the display clock config command on the Ethernet interface to view the value of the Pri(sys/2m-1/2m-2) field.

      A smaller priority value indicates a higher priority.

      • If the priority of the interface clock source is low, run the clock [ 2msync-1 | 2msync-2] prioritypriority-value command in the interface view to raise the priority.

      • If the interface clock source has a proper priority, but the problem persists, go to Step 2.

  2. Do as follows based on the clock source selection mode:

    1. If enabling SSM control is required, run the display clock config command to view the SSM control status.

      • If SSM control is in the off state, run the clock ssm-contro lon command in the system view to enable SSM control.

      • If SSM control is in the on state, but the problem persists, go to Step b.

    2. Run the display clock config command on the Ethernet interface to view the priority value in the Pri(sys/2m-1/2m-2) field.

      The smaller the priority value, the higher the priority.

      • If the priority clock source is low, choose the following configuration based on the type of clock source:

        • For line clock source, run the clock [ 2msync-1 | 2msync-2 ] priority priority-value command in the interface view to raise the priority.

        • For BITS or PTP clock source, run the clock source bits priority or clock source ptp priority command in the system view to raise the priority.

      • If the interface clock source has a proper priority, but the problem persists, go to Step 3.

      • If the threshold of the SSM quality level of the clock source has been configured using the clock input-threshold command, run the display this command in the system view to check the comparison between the input SSM quality level and the SSM quality level of the interface clock source.

        • If the input SSM quality level of the clock source is higher, run the clock input-threshold command to lower the threshold of the input SSM quality level of the clock source.

        • If the threshold of the input SSM quality level of the clock source is appropriate but the problem persists, go to Step 3.

  3. Check that no clock source is forcibly selected as the system clock source.

    Run the display clock config command to check whether clock force is displayed in the sys pll field of switch config.

    • If clock force is displayed, run the clock clear command in the system view.

    • If no forcible clock source selection is enabled, but the problem persists, go to Step 3.

    NOTE:

    If forcible clock source selection is enabled, the system does not select its clock source based on the SSM level.

  4. Contact Huawei and provide the following information:

    • Results of this troubleshooting procedure

    • Configuration, log, and alarm files

Relevant Alarms and Logs

Relevant Alarms

CLKM_1.3.6.1.4.1.2011.5.25.186.1.8.24 hwClockSourceInputBelowThreshold

Relevant Logs

None

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Updated: 2019-06-11

Document ID: EDOC1000175918

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