ā06-10-2013 02:33 AM - edited ā03-04-2019 08:09 PM
Hi
I have a lab with some asr901 and c2800.
I am trying to hide the WAN from the customers.
mpls ip propagate-ttl (default)
Effect: TTL 253, traceroute showing the 5 hops in the WAN
no mpls ip propagate-ttl forwarded
Effect: TTL 253, traceroute showing the 5 hops in the WAN,(exactly the same results).
What am i missing here?
Thanks
/Daniel
ā06-10-2013 02:41 AM
Are you trying this in MPLS Edge router
ā06-10-2013 03:14 AM
I have a pc pinging anouhter PC at the other end of the WAN lab cloud.
These pc:s are connected directly on asr901 routers that runns MPLS.
ā06-10-2013 03:53 AM
Hello Daniel,
As I understand it, is that this command needs to be applied on all LSR's in the mpls switch path
res
Paul
Please don't forget to rate any posts that have been helpful.
Thanks.
ā06-10-2013 04:22 AM
You can put this command in both the edge routers in Config mode.
no mpls ip propogate-ttl.
This will work for sure. Please reply
ā06-10-2013 05:01 AM
Hi and thaks for your replay
This command is configured on all LSR:s on the path and then rebooted just in case.
I have tryded without the "forwarded" option but still the same effekt.
The effect that i am looking for is that the icmp replay chould have ttl like 254/253 and traceroute chould have about 1 or 2 hops, not 5.
I get ttl 253 that may be correct but i dont whant to see the the WAN hops.
If i change the accessports to the pc:s so it is not a part of a vrf, so it just uses the global routing, the ttl become 250 like it would be with ordinary routing.
ā06-10-2013 01:00 PM
Hi Daniel,
The command "no mpls ip propagate-ttl forwarded" will hide all LSRs in the core except for the ingress and egress LSR.
Regards
ā06-11-2013 01:37 AM
Can you please share trace o/p before and after disaling ttl propogation
ā06-11-2013 12:57 AM
Hi,
here is how it works in details:
http://www.cisco.com/en/US/tech/tk436/tk428/technologies_tech_note09186a008020a42a.shtml#no_mpls
Regards,
Milan
ā06-12-2013 01:01 AM
I think i need to go for a TAC on this one, it could be a "feature" on these new ASR901.
ā12-12-2013 06:20 AM
The ASR901 has no support for ths feature, but in the future it will.
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