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Huawei switch optical port automatically shuts down

Fiber optic splice closure knowledge brief Published 13 Jul 2020

Prepared for preliminary research by the RIVO OPTICAL knowledge desk. Confirm cable count, splice capacity, sealing class, tray layout, protection sleeves and installation requirements against current standards and product documentation.

Huawei switch optical ports may automatically shut down due to hardware faults, configuration mismatches, optical module issues, or Automatic Laser Shutdown (ALS) activation.Common Causes

1. Hardware and Optical Module Issues Optical ports can go down if there are hardware failures in the switch, optical modules, fibers, or network cables. Non-Huawei-certified or faulty optical modules can also trigger shutdowns. Using incompatible fiber types (single-mode vs. multi-mode) or mismatched transmission rates can cause the port to enter a shutdown state . 2. Configuration and Software Problems Inconsistent configurations between local and remote devices, such as mismatched auto-negotiation, interface speed, or duplex settings, can cause the port to shut down. Ports may also be administratively shut down via commands, which can be verified using display interface interface-type interface-number . 3. Automatic Laser Shutdown (ALS) ALS is a feature that automatically turns off the laser on an optical port when a fault is detected on the client-side or WDM-side link. The laser is re-enabled once the fault is cleared. This mechanism helps quickly transmit link fault information to client devices and reduces service interruption time . 4. Network Protocols and Loops Spanning Tree Protocol (STP), Rapid STP (RSTP), or Unidirectional Link Detection (UDLD) can cause ports to shut down if loops or one-way traffic are detected. Excessive errors or repeated up/down events on the port may also trigger automatic shutdowns .

Troubleshooting Steps
  1. Check Port Status: Use display interface brief or display interface xgigabitethernet0/0/2 to verify if the port is administratively down or physically down .
  2. Inspect Optical Modules: Ensure modules are Huawei-certified, compatible with the fiber type, and within the correct wavelength and power range. Clean optical bores and use dust plugs for idle ports .
  3. Loopback Test: Connect the fiber jumper back to the same optical module to test if the port can go up .
  4. Check Configuration: Verify auto-negotiation, speed, duplex, and STP settings. Adjust configurations to match the remote device .
  5. Power Cycle or Reboot: If the fault persists, restart the switch or power cycle it. Consider upgrading the system software to a recommended version .
  6. Monitor ALS Events: If ALS is enabled, check for client-side or WDM-side faults that may be triggering automatic shutdowns . By systematically checking hardware, configuration, optical modules, and ALS-related events, you can identify the root cause and restore the optical port to normal operation.

Huawei switch optical port automatically shuts down - RIVO MULTITRADE OPTICAL SYSTEMS [PDF]

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