no mpls ip ttl propogate

[sandhya.shyamsundar]

Is it sufficient to configure the command "no mpls ip propagate-ttl" in the CE  router in a MPLS VPN CE to ignore all hops traversed by the MPLS packet in the  network? or is it required to be configured in all routers in the egde and core  of the provider network?

The output is required is that when a customer  runs a traceroute from one CE to the other CE, no service provider hops should  be visible to them.

[Mahesh Gohil]

Hi sandhya,

this command is required in every hop of ISP router if that provider want that none of the hop being visible to his

customer if that customer runs traceroute.

you may refer to below blog for more details

http://blog.ipexpert.com/2009/11/25/mpls-ip-ttl-propagation/

Hope this helps

Regards

Mahesh

[Atif Awan]

mahesh.gohil wrote:
Hi sandhya,
this command is required in every hop of ISP router if that provider want that none of the hop being visible to his
customer if that customer runs traceroute.
you may refer to below blog for more details
http://blog.ipexpert.com/2009/11/25/mpls-ip-ttl-propagation/
Hope this helps
Regards
Mahesh

Mahesh,

This command is required on the PE devices only as they copy the IP TTL to MPLS TTL (ingress PE) and vice versa (egress PE).

Atif

[meperuma]

Hi , as mentioned by Atif, all you need is disable the TTL propagation on the PEs

Sent from Cisco Technical Support iPhone App

[Mahesh Gohil]

Hello Atif,

This command is required on the PE devices only as they copy the IP TTL to MPLS TTL (ingress PE) and vice versa (egress PE).

for me PE means hop of ISP provider.

Regards

Mahesh

[Atif Awan]

mahesh.gohil wrote:
Hello Atif,
This command is required on the PE devices only as they copy the IP TTL to MPLS TTL (ingress PE) and vice versa (egress PE).
for me PE means hop of ISP provider.
Regards
Mahesh

Hello Mahesh,

The reason I mentioned it was that you said it is required on 'every hop' of ISP. I just wanted to clarify that it is only required on the PE devices. If we are on the same page then all is good :- ).

Atif

[Mahesh Gohil]

ohh I see! the meaning is to PE and not P routers.

thanks for clarification

Regards

Mahesh