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Spirent KB Article
Doc ID: FAQ18034
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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