Specifications

trace mpls
MP-834
Cisco IOS Multiprotocol Label Switching Command Reference
January 2010
'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
Use the show running-config command to verify the configuration of Tunnel 0 (shown in bold). The
tunnel destination has the same IP address as the one in the earlier trace IPv4 example, but the trace takes
a different path, even though tunnel 0 is not configured to forward traffic by means of autoroute or static
routing. The trace mpls traffic-eng command is powerful; it enables you to test the tunnels to verify
that they work before you map traffic onto them.
Router# show running-config interface tunnel 0
Building configuration...
Current configuration : 210 bytes
!
interface Tunnel0
ip unnumbered Loopback0
no ip directed-broadcast
tunnel destination 10.131.191.252 <---- Tunnel destinatio
n IP address.
tunnel mode mpls traffic-eng
tunnel mpls traffic-eng path-option 5 explicit name as1pe-long-path
end
Router# show mp
ls traffic-eng tunnels tunnel 0 brief
Signalling Summary:
LSP Tunnels Process: running
RSVP Process: running
Forwarding: enabled
Periodic reoptimization: every 3600 seconds, next in 1369 seconds
Periodic FRR Promotion: Not Running
Periodic auto-bw collection: disabled
TUNNEL NAME DESTINATION UP IF DOWN IF STATE/PROT
PE_t0 10.131.191.252 - Et0/0 up/up
Router# show ip
cef 10.131.191.252
10.131.191.252/32, version 37, epoch 0, cached adjacency 10.131.159.246
0 packets, 0 bytes
tag information set, all rewrites owned
local tag: 21
via 10.131.159.246, Ethernet1/0, 0 dependencies
next hop 10.131.159.246, Ethernet1/0
valid cached adjacency
tag rewrite with Et1/0, 10.131.159.246, tags imposed {}
The following example performs a trace operation on a multisegment pseudowire. The trace operation
goes to segment 2 of the multisegment pseudowire.
Router# trace mpls pseudowire 10.10.10.9 220 segment 2
Tracing MS-PW segments within range [1-2] peer address 10.10.10.9 and timeout 2 seconds
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,