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I'm sorry to say this is a HW limitation.
Workaround:
Configure a PACL with redirect to the egress interface or configure BFD without the echo function
1. TTAG-Strip will definitely remove TTAG header by egress port. That's why you didn't see it.
2. I think you should capture packet from e1/2's endpoint directly instead rely on SPAN. Ping failed already points e1/2 endpoint may not recognize pky whi...
