Are there any advantages / disadvantages of keeping MPLS TTL propagation enabled?

[Nitin Nayar]

HI Guys,

Are there any advantages / disadvantages of keeping MPLS TTL propagation enabled? What are the recommended design / best practices from Cisco

Are there examples of common ISP's that enable it ? Examples of ISP who keep them disabled?

I am seeing requests around this for path monitoring and trying to gauge from the broader team on ISP best practices.

[Julio E. Moisa]

Hi

Well, technically there is no a disadvantage but you are exposing all the paths, including information that could be used for any threat. So I recommend disable it on all the devices running MPLS. The ISP's disable this option. 

Hope it is useful

:-)