Specifications

trace mpls
MP-833
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
Repeat [1]:
Packet size [100]:
Timeout in seconds [2]:
Extended commands? [no]: yes
Destination start address:
Destination end address:
Source address:
EXP bits in mpls header [0]:
TimeToLive [255]:
Reply mode (2-ipv4 via udp, 3-ipv4 via udp with router alert) [2]:
Reply ip header DSCP bits [0]:
Tracing MPLS Label Switched Path to 10.131.191.252/32, 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, 'X' - unknown return code, 'x' - return code 0
Type escape sequence to abort.
0 10.131.159.245 mtu 1500 []
! 1 10.131.191.252 100 ms
The following example shows how to trace packets through an MPLS TE tunnel:
Router# trace mpls traffic-eng Tunnel 0
Tracing MPLS TE Label Switched Path on Tunnel0, 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, 'X' - unknown return code, 'x' - return code 0
Type escape sequence to abort.
0 10.131.159.230 mtu 1500 [Labels: 22 Exp: 0]
R 1 10.131.159.225 mtu 1500 [Labels: 22 Exp: 6] 72 ms
R 2 10.131.191.229 mtu 1504 [implicit-null] 72 ms
! 3 10.131.191.252 92 ms
Alternatively, you can use the interactive mode:
Router# traceroute
Protocol [ip]: mpls
Target IPv4 or tunnel [ipv4]: traffic-eng
Tunnel number [0]:
Repeat [1]:
Timeout in seconds [2]:
Extended commands? [no]:
Tracing MPLS TE Label Switched Path on Tunnel0, 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,