Mar 12, 2013

CRC Troubleshooting Guide for ATM Interfaces

Reasons for ATM CRC Errors

The following are some potential reasons for ATM CRC errors:

  • Dropped cells due to traffic policing in the ATM cloud on one or more VCs attached to the ATM interface.
  • Noise, gain hits, or other transmission problems on the data-link equipment.
  • A faulty or failing ATM interface.

The show interfaces command output displays the CRC error count. These errors suggest that when the SAR reassembles the packet and checks the CRC, the calculated CRC value does not match the value in the assembled packet's CRC field.
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