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Community Member

no mpls propagate-ttl

Hello everybody,

I am just wondering if there is any 'show' command (except 'traceroute') to verify whether 'mpls propagate-ttl' is on or off

Thanks

Mike

2 ACCEPTED SOLUTIONS

Accepted Solutions
Cisco Employee

Re: no mpls propagate-ttl

Mike,

"mpls ip propagate-ttl" is enabled by default. The best way to find out whether it is enabled or not is to do a "show runn | incl propagate".

This will tell you whether the TTL propagation is disabled for transit traffic, locally originated traffic or both.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Re: no mpls propagate-ttl

Hi,

By default, the mpls ip propagate-ttl command is enabled and the IP TTL value is copied to the MPLS TTL field during label imposition.

I am not kidding, but i think that you have no way except to do show run :).

router#sh run | i ttl

no tag-switching ip propagate-ttl forwarded

router#

HTH, please do rate all helpful replies,

Mohammed Mahmoud.

4 REPLIES
Cisco Employee

Re: no mpls propagate-ttl

Mike,

"mpls ip propagate-ttl" is enabled by default. The best way to find out whether it is enabled or not is to do a "show runn | incl propagate".

This will tell you whether the TTL propagation is disabled for transit traffic, locally originated traffic or both.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Re: no mpls propagate-ttl

Hi,

By default, the mpls ip propagate-ttl command is enabled and the IP TTL value is copied to the MPLS TTL field during label imposition.

I am not kidding, but i think that you have no way except to do show run :).

router#sh run | i ttl

no tag-switching ip propagate-ttl forwarded

router#

HTH, please do rate all helpful replies,

Mohammed Mahmoud.

Re: no mpls propagate-ttl

Hi Harold,

Sorry didn't see your reply :)

BR,

Mohammed Mahmoud.

Community Member

Re: no mpls propagate-ttl

Hi,

As the other posts indicated

show run | i propagate-ttl

There are 2 options for dis-abling the ttl

forwarded and local where forwarded option allows the propagation of packets originated by the local device.

Regards

Noel

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