Re: Weird MPLS Label Switching Problem

Which shows you that your "no mpls ip propagate-ttl" did its job and MPLS
backbone is "hidden" from CE devices. Remove this command from PE1, run a
traceroute from CE1 and see the labels re-appear.

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On Sat, Feb 26, 2011 at 21:10, Malik Nouman Ahmad <djmalik_at_gmail.com> wrote:
> One thing I forgot to mention. For CE-CE trace there is no label seen in
> the
> traceroute but trace completes properly and I can ping between the CEs
> normally
>
> Thanks
>
> On Sun, Feb 27, 2011 at 12:07 AM, Malik Nouman Ahmad <djmalik_at_gmail.com
> >wrote:
>
> > Hi,
> >
> > I was studying MPLS VPN and while working on an example I am facing some
> > strange issue
> >
> > The connectivity is CE1 - PE1 - P1 - P2 - PE2 - CE2
> >
> > PE1(.1) - CE1 (.2) with subnet 172.16.1.0/24 with VRF A (RD=RT=1:1)
> > PE2(.1) - CE2 (.2) with subnet 172.16.2.0/24 with VRF A (RD=RT=1:1)
> >
> > PE1 & PE2 have MPLS VPN set up and I can see labels for everything when I
> > check "show mpls forwarding" on the PEs
> >
> > when I trace from PE1 to CE2 I can see labels being switches properly
> using
> > the following command
> > trace vrf A 172.16.2.2 source 172.16.1.1
> >
> > but when trace from CE1 to CE2, there are no labels whatsoever
> > trace 172.16.2.2 source 172.16.1.2
> >
> > Same thing is happening in the reverse direction (i.e. trace from CE2 to
> > CE1). I have done several examples previously and never faced such issue.
> > Instead of doing it all over again I want to troubleshoot the problem for
> > learning purpose
> >
> > Can anybody suggest how to troubleshoot this problem? I have applied "no
> > mpls ip propagate-ttl" just to see if it was working and it worked
> >
> > Please advise what should I do?
> >
> > Thanks,
> > Malik
>
>
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