RP/0/RP0/CPU0:PE2#ping mpls ipv4 2.2.2.2/32
Mon Oct 12 04:05:46.972 UTC

Sending 5, 100-byte MPLS Echos to 2.2.2.2/32,
      timeout is 2 seconds, send interval is 0 msec:

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 12/12/15 ms
RP/0/RP0/CPU0:PE2#traceroute mpls ipv4 2.2.2.2/32
Mon Oct 12 04:05:47.304 UTC

Tracing MPLS Label Switched Path to 2.2.2.2/32, timeout is 2 seconds

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

  0 10.4.5.5 MRU 1500 [Labels: 44000 Exp: 0]
L 1 10.4.5.4 MRU 1500 [Labels: 33000 Exp: 0] 74 ms
L 2 10.3.4.3 MRU 1500 [Labels: implicit-null Exp: 0] 13 ms
! 3 10.2.3.2 82 ms