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Huawei switch

ODN and passive infrastructure knowledge brief Published 14 Oct 2023

Prepared for preliminary research by the GESTIONVAL ODN knowledge desk. Confirm network topology, split ratio, box or cabinet capacity, joint closure rating and loss budget against current standards and product documentation.

Multiple CRC errors on a Huawei switch optical interface usually indicate physical layer issues such as faulty transceivers, damaged fibers, or mismatched interface settings.Understanding CRC Errors

CRC (Cyclic Redundancy Check) errors occur when the transmitted and received data verification values do not match, indicating data corruption on the link. Persistent CRC errors can lead to packet loss, degraded network performance, and alarms on the switch. On Huawei devices, these errors are visible using the command display interface [interface-name] and are often accompanied by discarded packet counts and other physical layer statistics .

Common Causes
  1. Faulty Optical Modules: A defective transceiver can generate repeated CRC errors.
  2. Damaged or Contaminated Fiber: Scratched, bent, or dirty connectors degrade signal quality.
  3. Cable Quality or Length Issues: Exceeding the supported transmission distance of the optical module can trigger low optical power and CRC errors.
  4. Mismatched Interface Settings: Duplex or speed mismatches, or inconsistent auto-negotiation settings, can cause errors.
  5. Environmental Interference: Electromagnetic interference (EMI) from nearby equipment may affect signal integrity .
Troubleshooting Steps
  1. Check Interface Statistics: Run display interface [interface-name] multiple times to monitor CRC error trends.
  2. Inspect and Reinstall Hardware: Remove and reinstall optical fibers and transceivers. Clean connectors and use dust-proof caps for idle ports. Replace any damaged fibers or modules .
  3. Verify Optical Module Compatibility: Ensure multimode modules are used with multimode fibers and single-mode modules with single-mode fibers. Confirm wavelengths match at both ends using display interface transceiver verbose.
  4. Check Transmission Distance: Confirm the fiber length does not exceed the module's supported distance. For example, OM1 modules support up to 30 meters, OM3 up to 300 meters .
  5. Adjust Interface Settings: Disable auto-negotiation if necessary and manually set matching speed and duplex on both ends.
  6. Monitor Alarms: Huawei switches may trigger alarms when CRC errors exceed thresholds (e.g., 20 errors per minute). Use MIB/OID monitoring for remote units to track error statistics .
  7. Firmware Updates: Ensure the switch firmware is up to date to avoid known CRC-related bugs .
Preventive Measures
  • Keep fiber connectors clean and covered when idle.
  • Use high-quality optical cables and modules.
  • Regularly monitor interface statistics to detect early signs of degradation.
  • Ensure consistent configuration across connected devices. By systematically following these steps, you can identify the root cause of multiple CRC errors and restore stable optical link performance on Huawei switches.

Huawei switch - GESTIONVAL ODN INFRASTRUCTURE S.L. [PDF]

Huawei switch

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Technical note

This reference is intended for preliminary ODN and passive infrastructure research. Topology, split ratio, box or cabinet capacity, closure rating, cable type, test limits and applicable standards must be verified for the specific project.

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