[c-nsp] TTL not decrementing (MPLS, SXI, Sup720)

[Phil Mayers]

On 01/26/2011 07:10 PM, Peter Rathlev wrote:
> Would anybody here know why a PE (Cat6500/Sup7203B running SXI1) would
> not decrement TTL for traces towards known (=has ARP entry) hosts on an
> interface?Would anybody here know why a PE (Cat6500/Sup720 running SXI1)
> would not decrement TTL for traces towards known (=has ARP entry) hosts
> on an interface?

There are some funny behaviours w.r.t traceroute under PFC-3B and 
earlier versions. Do you have a mix of PFC/DFC versions?

We see oddities routinely with penultimate hop popping and vrf aggregate 
labels, including the same behaviour you're seeing. I believe it's a 
hardware limitation.