Interface CRC Error Alert

An Interface CRC Error alert is triggered when a switch interface records a high number of cyclic redundancy check (CRC) errors within a short period. By default, Aruba Central raises an alert when the interface logs 100 CRC errors in 10 minutes. Users can configure custom thresholds as needed; however, HPE recommends retaining the default threshold to ensure accurate fault detection without excessive alerting. CRC errors typically indicate data corruption occurring at the physical layer, often due to faulty cabling, connectors, or transceivers.

Alert Triggering and Clearing Conditions

  • Triggering Condition—The alert is triggered when the CRC error count on an interface exceeds the configured threshold within the evaluation window.

  • Clearing Condition— The alert automatically clears when the CRC error rate falls below the configured threshold.

Common Causes

CRC errors on an interface may occur due to:

  • Damaged or low-quality Ethernet cables

  • Loose or improperly seated connectors

  • Faulty or incompatible transceivers (SFPs)

  • Duplex mismatches between devices

  • Electromagnetic interference (EMI) in the cable path

  • Physical port or NIC defects

Alert Behavior

When an Interface CRC Error alert is triggered:

  • HPE Aruba Networking Central identifies the impacted port and flags it under the Interface Card view.

  • The alert appears in the Root Cause and Action section with detailed CRC statistics.

  • You can initiate a cable test directly from HPE Aruba Networking Central on the affected interface to diagnose potential layer-1 issues.

Recommended Actions

When you receive a Interface CRC Error alert:

  • Inspect the physical cable for damage, looseness, or improper seating.

  • Replace transceivers if optical interfaces are involved.

  • Check for loops or topology changes if STP is enabled.

  • Verify interface configuration, including speed or duplex settings.

  • Run a cable test from HPE Aruba Networking Central to validate physical layer health.

  • Monitor the port after corrective actions to ensure the flapping stops.

Related Events

The alert is associated with CRC error events observed on the affected interface during packet reception.

Additional Notes

CRC errors indicate packet corruption detected by hardware checksums. Persistent CRC errors may lead to degraded performance or packet drops. Alerts clear automatically once the error rate falls below the defined threshold.