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Spirent TestCenter : Why do I see frame check sequence (FCS) error on TX port capture?DocID: FAQ10223 ANSWERWYSIWYG_EDITAnswer:

When port diagnostic loopback is set, captured TX frames show FCS error.

  • For the transmit packets (we can only capture control plane) we cannot verify the checksum as it is not yet added, therefore checksum error.
  • For the receive packets (we can capture control and data plane) we can verify the checksum as checksum has been added and checksum should be correct.

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