[c-nsp] MPLS traffic not taking LSP tunnels

[Gert Doering]

Hi,

On Mon, Oct 03, 2016 at 12:17:02PM -0500, Joe Freeman wrote:
> I see this in failed pings between the CE routers and traceroutes between
> them that show the link addresses of the P routers before the traffic fails.

This is not necessarily an indication of "not taking the tunnel", because
if you propagate packet TTL to the MPLS packets, you *will* see the P
routers.

Tracerouting from a cisco should show you "P router with MPLS info",
though, like this:

  3 ae8-xcr1.muc.cw.net (62.208.255.157) 0 msec 4 msec 0 msec
  4 ae17-xcr1.fix.cw.net (195.2.30.177) [AS 1273] [MPLS: Label 345006 Exp 0] 8 msec 8 msec 8 msec
  5 ae9-xcr1.fra.cw.net (195.2.28.201) [AS 1273] 8 msec 8 msec 8 msec

so, hop 4 is part of a (short) LSP between hop 3 and hop 5, and cw.net
is nice enough to actually show the topology instead of just hiding stuff
from their customers.

gert

-- 
USENET is *not* the non-clickable part of WWW!
                                                           //www.muc.de/~gert/
Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de
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