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Spirent TestCenter: Why is IMIX adding extra four bytes when testing with devices that have VLAN?

Environment/Versions
  • Spirent TestCenter
  • IMIX
Answer
  • Detail Descriptions:  
    • There is no additional four bytes added when Stream block frame Size configured with Fixed or other frame size option (except iMix)  and with VLAN enabled.
  • However, Stream block with iMix frame size with VLAN always adding extra four bytes to the data when it received
  • Explanation/Resolution: iMix Frame size does not include the VLAN size four bytes.  The Four bytes will be added to the Stream block on the fly.
  • However, the Fixed and other frame sizes already included the VLAN header and will not notice any different when the packet received.
 

Product : Spirent TestCenter,L2-3,Adaptive Streaming,API,Windows GUI,PGA