no mpls ip propagate-ttl forwarded

MPLS_no_TTL

Traceroute with out the ‘no mpls ip propagate-ttl forwarded’ :
R1#traceroute 6.6.6.6 source loopback 0

Type escape sequence to abort.
Tracing the route to 6.6.6.6

1 10.1.1.2 48 msec 72 msec 28 msec
2 20.1.1.2 [MPLS: Label 23 Exp 0] 92 msec 96 msec 108 msec
3 30.1.1.2 [MPLS: Label 23 Exp 0] 84 msec 172 msec 100 msec
4 40.1.1.2 [MPLS: Label 23 Exp 0] 40 msec 88 msec 24 msec
5 50.1.1.2 76 msec 148 msec *

Traceroute with the command ‘no mpls ip propagate-ttl forwarded’ :
R1#traceroute 6.6.6.6 source loopback 0

Type escape sequence to abort.
Tracing the route to 6.6.6.6

1 10.1.1.2 52 msec 32 msec 48 msec
2 40.1.1.2 [MPLS: Label 23 Exp 0] 72 msec 156 msec 36 msec
3 50.1.1.2 164 msec 132 msec *

You will always see ingress and egress PE nodes. What you are hiding are P nodes…

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