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Spirent TestCenter: Why does modifying the MPLS header make the IPv4 header disappear?

  • Any Spirent TestCenter version
  • Any Operating System
  • Any Hardware type
  • When selecting the autofeature the Bottom of Label Stack is automatically set to 1
  • If you do not use the autofeature, the Bottom of Label Stack is set to 0, which prevents networking devices and Wireshark from detecting the end of the MPLS header
  • You will have to set this bit manually depending on the behaviour you want (correct or incorrect frame)
See attached file for more detailed information.

Product : Windows GUI