MPLS propagate-ttl question

I have topology like this:
R1 -- R3 -- R2 -- R4 -- R5

where R2, R3 and R4 are LSR routers (R3 and R4 are PE, and R2 is P router),
and R1 and R5 are customer routers.
On routers R2, R3 and R4 I issued no mpls ip propagate-ttl
forwardedcommand. How come that when I'm doing traceroute from R1 to
R5 I still se
info about MPLS labels in provider's network:

R1#traceroute 5.5.5.5 source loopback 0

Type escape sequence to abort.
Tracing the route to 5.5.5.5

  1 10.1.13.3 4 msec 0 msec 4 msec
  2 10.1.45.4 [MPLS: Label 405 Exp 0] 0 msec 4 msec 0 msec
  3 10.1.45.5 28 msec * 28 msec

Is that normal behavior? Can we avoid provider's PE routers from traceroute
output, and here 10.1.13.3 is R3, 10.1.45.4 is R4 (PE routers) and 10.1.45.5
is CE.

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Received on Sun Nov 01 2009 - 19:53:07 ART