[nsp] Weird Traceroute - MPLS

[Paul Stewart]

I admit I don't know a lot about MPLS but can someone explain this traceroute:

Type escape sequence to abort.
Tracing the route to www.tucows.com (216.40.32.30)

  1 gw-vlan759.nexicom.net (216.168.111.185) 4 msec 0 msec 4 msec
  2 gw-7513.nexicom.net (216.168.96.1) 160 msec 8 msec 0 msec
  3 dis1-toronto63-fe1-5-14.in.bellnexxia.net (206.108.110.221) 8 msec 4 msec
4 msec
  4 core2-toronto63-pos1-2.in.bellnexxia.net (206.108.98.125) 8 msec 4 msec 8 msec
  5 64.230.242.105 [MPLS: Label 12903 Exp 0] 176 msec 64 msec 8 msec
  6 64.230.242.181 [MPLS: Label 12905 Exp 0] 4 msec 44 msec 200 msec
  7 64.230.242.198 [MPLS: Label 12473 Exp 0] 8 msec 4 msec 4 msec
  8 dis1-toronto12-pos6-0.in.bellnexxia.net (206.108.97.70) 8 msec 4 msec 4 msec
  9 206.108.111.106 8 msec 4 msec 8 msec
 10 10.78.254.125 8 msec 8 msec 4 msec
 11 10.78.254.8 12 msec 8 msec 4 msec
 12 129.33.183.72 8 msec 4 msec 8 msec
 13  *  *  *
 14  *  *  *

Why is MPLS data showing up in a traceroute?  I've never seen this before..

Thanks,

Paul