Re: MPLS propagate-ttl question

OK. Hvala. Thanks.

On Sun, Nov 1, 2009 at 8:08 PM, Marko Milivojevic <markom_at_ipexpert.com>wrote:

> On Sun, Nov 1, 2009 at 18:53, Ivan <ivanzghr_at_gmail.com> wrote:
> > I have topology like this:
> > R1 -- R3 -- R2 -- R4 -- R5
> >
> > where R2, R3 and R4 are LSR routers (R3 and R4 are PE, and R2 is P
> router),
> > and R1 and R5 are customer routers.
> > On routers R2, R3 and R4 I issued no mpls ip propagate-ttl
> > forwardedcommand. How come that when I'm doing traceroute from R1 to
> > R5 I still se
> > info about MPLS labels in provider's network:
> >
> > R1#traceroute 5.5.5.5 source loopback 0
> >
> > Type escape sequence to abort.
> > Tracing the route to 5.5.5.5
> >
> > 1 10.1.13.3 4 msec 0 msec 4 msec
> > 2 10.1.45.4 [MPLS: Label 405 Exp 0] 0 msec 4 msec 0 msec
> > 3 10.1.45.5 28 msec * 28 msec
> >
> > Is that normal behavior? Can we avoid provider's PE routers from
> traceroute
> > output, and here 10.1.13.3 is R3, 10.1.45.4 is R4 (PE routers) and
> 10.1.45.5
> > is CE.
>
> What you are seeing is normal. You will always see ingress and egress
> PE nodes. What you are hiding are P nodes. As you can see on the
> output, R2 is hidden from the trace.
>
> Try making a topology with several P routers - that's when this
> becomes a little bit more obvious.
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
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Received on Sun Nov 01 2009 - 20:33:59 ART