[nsp] Weird Traceroute - MPLS

[Wojtek Zlobicki]

This is not necessarily "MPLS" data, just someone using non routable
address space to number their interfaces.  While this is not
recommended, its certainly not unusual and uncommon.

On Mon, 12 Jul 2004 21:07:35 -0400, Paul Stewart <pauls at nexicom.net> wrote:
> 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
> 
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-- 
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wojtek.zlobicki at gmail.com