[c-nsp] traceroute shows mpls labels...how?

[Chris Evans]

Yes the windows box will get, it just doesn't what to do with it.  A router
that isn't mpls enabled, but can understand it will show them.
On Aug 22, 2012 3:22 PM, "Aaron" <aaron1 at gvtc.com> wrote:

> That’s what I was looking for.  So is it a part of the mpls lsr’s icmp
> implementation that would allow those icmp extensions to carry and send
> that info or the traceing device (windows) or both?  In other words, I
> wonder if the windows device actually is rcv’ing the icmp extended packets
> carrying that mpls label info BUT the tracert windows application just
> isn’t smart enough to render it on the cli output….  I would think that
> wireshark on windows would tell me if it is or isn’t seeing those
> extensions with the label info****
>
> ** **
>
> Aaron****
>
> ** **
>
> *From:* Chris Evans [mailto:chrisccnpspam2 at gmail.com]
> *Sent:* Wednesday, August 22, 2012 3:03 PM
> *To:* Phil Bedard
> *Cc:* &lt,cisco-nsp at puck.nether.net&gt,; Aaron
> *Subject:* Re: [c-nsp] traceroute shows mpls labels...how?****
>
> ** **
>
> Also this depends on vendor too.  IIRC junos uses udp for its trace
> routing and ios uses icmp.    Meaning that if you did traceroute from a
> cisco box going over a juniper network the labels wouldn't show and vice
> versa.   You brought up something I was 100% suee about a few years ago but
> those brain cells are gone.   ****
>
> On Aug 22, 2012 2:58 PM, "Phil Bedard" <philxor at gmail.com> wrote:****
>
> There are ICMP extensions to carry MPLS label stack information but the
> trace route application needs to support it.   The windows client doesn't.
>
> Phil
>
> Sent from my iPad
>
> On Aug 22, 2012, at 3:21 PM, "Aaron" <aaron1 at gvtc.com> wrote:
>
> > Do you all know how this works?  How is traceroute able to report back
> the
> > mpls label that is in use in the transit hops?  Also wondering why I
> don't
> > see this on windows command line tracert
> >
> >
> >
> > Aaron
> >
> >
> >
> >
> >
> > RP/0/RSP0/CPU0:9k#trace vrf one 1.2.3.4 source 2.4.6.8
> >
> >
> >
> > 1  19.1911.5 [MPLS: Labels 16001/16220 Exp 0] 2 msec  1 msec  0 msec
> >
> > 2  19.1911.1 [MPLS: Label 16220 Exp 0] 0 msec  0 msec  1 msec
> >
> > 3  88.88.191.22 0 msec  0 msec
> >
> >    19.1911.33 1 msec
> >
> > 4  88.88.191.18 1 msec  1 msec  0 msec
> >
> > 5  88.88.135.221 10 msec  10 msec  11 msec
> >
> > 6  122.47.236.130 [MPLS: Label 17039 Exp 1] 47 msec  49 msec  51 msec
> >
> > 7  122.47.154.53 [MPLS: Labels 0/17017 Exp 1] 48 msec  49 msec  47 msec
> >
> > 8  122.45.30.134 [MPLS: Labels 23417/17016 Exp 1] 48 msec  49 msec  47
> msec
> >
> > 9  122.45.1.17 [MPLS: Labels 23439/17016 Exp 1] 50 msec  49 msec  51 msec
> >
> > 10 122.45.31.189 [MPLS: Labels 0/17016 Exp 1] 51 msec  54 msec  51 msec
> >
> > 11 122.45.158.34 [MPLS: Labels 0/16009 Exp 1] 49 msec  50 msec  47 msec
> >
> > 12 122.45.104.49 46 msec  46 msec  47 msec
> >
> > 13 122.45.108.14 47 msec  47 msec  47 msec
> >
> > 14  *  *  *
> >
> > 15  *  *  *
> >
> > 16  *
> >
> >
> >
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