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


 

Answer

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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Document Information

Doc ID: FAQ10223
Updated:: August 26, 2013
Published: May 30, 2011
Categories: Test Modules,   General Navigation,   L2-3,   Windows GUI,   Spirent TestCenter