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Spirent KB Article
Doc ID: FAQ12433
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Spirent TestCenter: Why is IMIX adding extra four bytes when testing with devices that have VLAN?
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