I guess I should rephrase. We have configured "mpls ip-ttl-propagate disable" to try to hide the labeled part of the path. For whatever reason, we always get something like the following: CE1#trace 10.6.10.1 source lo0 Type escape sequence to abort. Tracing the route to 10.6.10.1 VRF info: (vrf in name/id, vrf out name/id) 1 192.168.105.50 0 msec 0 msec 0 msec 2 192.168.62.2 [MPLS: Label 16018 Exp 0] 4 msec 0 msec 0 msec 3 192.168.62.60 0 msec 0 msec 0 msec 4 192.168.106.61 4 msec * 0 msec CE1# If I trace from CE1 to the loopback of PE2, which is the same path, it works as expected and the labeled part of the path is hidden:
CE5#trace 10.6.1.1 source lo0 Type escape sequence to abort. Tracing the route to 10.6.1.1 VRF info: (vrf in name/id, vrf out name/id) 1 192.168.105.50 4 msec 0 msec 0 msec 2 192.168.62.60 0 msec * 0 msec On Tue, Jul 30, 2013 at 11:43 AM, Jared Mauch <[email protected]> wrote: > Disable TTL != don't copy label into ICMP TTL Expired message. > > - Jared > > On Jul 30, 2013, at 1:37 PM, John Neiberger <[email protected]> wrote: > > > I think either we're just doing something wrong or perhaps we're running > > into a bug. I did find this one, which sounds similar: > > > > https://tools.cisco.com/bugsearch/bug/CSCtd17126 > > > > I'm not sure if that is fixed in 4.1.0 or not. > > > > > > On Tue, Jul 30, 2013 at 11:01 AM, John Neiberger <[email protected] > >wrote: > > > >> W > >> e're running into an interesting problem. We have a simple lab setup > like > >> this: > >> > >> CE1 -- PE1 --- P1 --- P2 --- PE2 --- CE2 > >> > >> We have "mpls ip-ttl-propagate disable" on all PE and P routers, but if > we > >> trace from CE1 to CE2, we still see an MPLS label coming from the PE2 > >> router. If we trace CE2 to CE1, we see a label on the hop from P1 to > PE1. > >> > >> If we have ttl propagation completely disabled, why would we still see > the > >> label and P-to-PE link in the path? > >> > >> All P and PE routers are IOS XR running 4.1.0. > >> > >> Thanks, > >> John > >> > > _______________________________________________ > > cisco-nsp mailing list [email protected] > > https://puck.nether.net/mailman/listinfo/cisco-nsp > > archive at http://puck.nether.net/pipermail/cisco-nsp/ > > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
