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Troubleshooting Guide

CloudEngine 16800, 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

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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).
After Two Optical Interfaces Are Connected, an Alarm on Abnormal Optical Power Is Generated on the Local Device, and the Remote Interface Flaps or a CRC Alarm Is Generated

After Two Optical Interfaces Are Connected, an Alarm on Abnormal Optical Power Is Generated on the Local Device, and the Remote Interface Flaps or a CRC Alarm Is Generated

Fault Description

An optical interface of the CE12800 connects to an optical interface of another device. An alarm on high or low optical power is generated on the CE12800. The remote interface flaps or a CRC alarm is generated.

Common Causes

  • The local and remote optical modules have different wavelengths.

  • The optical fibers or optical modules are not securely connected.

  • Optical fibers of incorrect types and lengths are used.

  • The optical modules do not match the optical fibers connected to them.

  • The remote optical module is from a vendor different from that of the local optical module.

Troubleshooting Procedure

  1. Run the display interface transceiver verbose command in the user view, system view, or interface view to check whether the wavelengths of the local and remote optical modules are the same and whether information such as power of the optical modules is normal.

    <HUAWEI> display interface transceiver verbose
     40GE1/0/27:1 transceiver information:                                          
    -------------------------------------------------------------------             
     Common information:                                                            
       Transceiver Type                      :40GBASE_SR                            
       Connector Type                        :MPO                                   
                            :850                                   
                     :100(50um/125um OM3)                   
                                              150(50um/125um OM4)                   
    ……
  2. Remove and reinstall the optical fibers and modules and check whether the fiber connectors are damaged or contaminated, to check whether the interfaces recover.

    It is recommended that idle fiber connectors be covered with dust-proof caps to keep the fiber connectors clean. An unclean fiber connector may degrade the quality of optical signals or even cause link failures or error codes on the link.

  3. Check whether the optical fiber length is within the allowed transmission distance range of the optical module. If the transmission distance between two optical modules exceeds the maximum distance they support, alarms on low optical power will be generated even if the optical modules have the same wavelength.

    In the preceding command output, the Transfer Distance field indicates the transmission distance of the optical module. View this field to determine whether the optical fiber length is within the allowed transmission distance range of the optical module. For example, in the preceding command output, the transmission distance supported by OM3 optical fibers is 100 m. If the actual transmission distance exceeds 100 m, use an optical fiber with a longer transmission distance.

  4. Check whether the optical modules of the local and remote interfaces match the optical fibers connected to them.

    Multimode optical modules must be used with multimode optical fibers. Single-mode optical modules are generally used with single-mode optical fibers, and can also be used with multimode optical fibers. If a single-mode optical module is used with a single-mode optical fiber, the transmission distance is often longer than 10 km.

    • Generally, a single-mode optical fiber is yellow, and a multimode optical fiber is orange.
    • Generally, the handle of a multimode optical module is black and that of a single-mode optical module is blue. You can also view the label attached to an optical module to check whether it is a single-mode or multimode optical module. SM and MM indicate single-mode and multimode, respectively.
  5. Check whether the local and remote interfaces use optical modules of different types from different vendors.

    If the optical modules have the same wavelength and the distance between them is within the allowed range, but alarms on high or low optical power are still generated, the two optical modules may be from different vendors and of different types. Although they have same wavelength, their optical power specifications may be different due to different designs adopted by the vendors. This may also cause alarms on abnormal optical power. Replace the optical modules with the same type of optical modules that are certified for Huawei Ethernet switches.

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Updated: 2020-01-07

Document ID: EDOC1000060766

Views: 606199

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