Specifications

trace mpls multipath
MP-838
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
request destination address in the UDP packet is not used to forward the MPLS packet to the destination
router. The label stack that is used to forward the echo request routes the MPLS packet to the destination
router. The 127/8 address guarantees that the packets are routed to the localhost (the default loopback
address of the router processing the address) if the UDP packet destination address is used for
forwarding. In addition, the destination address is used to adjust load balancing when the destination
address of the IP payload is used for load balancing.
Examples The following example shows how to discover all IPv4 LSPs to a router whose IP address is 10.1.1.150:
Router# trace mpls multipath ipv4 10.1.1.150/32
Starting LSP Multipath Traceroute for 10.1.1.150/32
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 label entry,
'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.
LLLL!
Path 0 found,
output interface Et0/0 source 10.1.111.101 destination 127.0.0.0 LLL!
Path 1 found,
output interface Et0/0 source 10.1.111.101 destination 127.0.0.1 L!
Path 2 found,
output interface Et0/0 source 10.1.111.101 destination 127.0.0.5 LL!
Path 3 found,
output interface Et0/0 source 10.1.111.101 destination 127.0.0.7
Paths (found/broken/unexplored) (4/0/0)
Echo Request (sent/fail) (14/0)
Echo Reply (received/timeout) (14/0)
Total Time Elapsed 472 ms
The following example shows how to set the number of timeout retry attempts to 4 during a multipath
LSP trace:
Router# trace mpls multipath ipv4 10.1.1.150/32 retry-count 4
Starting LSP Multipath Traceroute for 10.1.1.150/32
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 label entry,
'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.
LLLL!
Path 0 found,
output interface Et0/0 source 10.1.111.101 destination 127.0.0.0 LLL!
Path 1 found,
output interface Et0/0 source 10.1.111.101 destination 127.0.0.1 L!
Path 2 found,
output interface Et0/0 source 10.1.111.101 destination 127.0.0.5 LL!
Path 3 found,
output interface Et0/0 source 10.1.111.101 destination 127.0.0.7