How is the TTL field in the label header generated?

How is the TTL field in the label header generated?

How is the TTL field in the label header generated?

A.
It is set to a number equal to the number of hops in the MPLS path plus 1.

B.
It is copied from the TTL field in the IP header on ingress.

C.
It is copied from the TTL field in the IP header on egress.

D.
It is set to 255 when enabled.



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