MPLS TTL propagation disabled: does first hop PE router appear in traceroute?


If MPLS TTL propagation is disbabled:


CE1 - PE1 ---many Ps-----PE2 - CE2


and you perform a traceroute from CE1 to CE2

does the first hop PE router (i.e. PE1) appear in the


I would not expect any Ps to appear, of course.

Basically I'm trying to understand: does PE1 decrement the IP TTL

and respond to the traceroute OR does it first MPLS encapsulate, TTL becomes 255,

and decide it need not reply to the traceroute?

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