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

[Phil Mayers]

On 03/09/2011 08:20 PM, Tim Durack wrote:

> I think I'm seeing something similar with a few
> 6504/SUP720-3BXL/6724-CFC running 12.2(33)SXI3.
>
> Traceroutes crossing these units in the global table timeout. Works fine
> in a VRF.

Timeout at which hop? Can you give an example?

>
> Can't mpls ping/traceroute from these units in the global table. Works
> fine in a VRF.

By "can't" do you mean "timeout at the penultimate hop"? Can you give an 
example?

>
> This makes troubleshooting unnecessarily difficult. Anyone found Cisco
> documentation explaining this behavior?

I did read some docs about this at one point; but I've not been able to 
find them again since. I suspect it was in relation to the PFC-3C, so 
you might try hunting for the docs on that.

Or it might have been during one of my "read all the TAC bugs in the 
release notes" sessions - perhaps try that.

Or open a TAC?

To emphasise my earlier point: after I read whatever I read, I came away 
pretty sure this is a hardware bug in the PFC-3B, and there's nothing 
that can be done to fix it.

I'll see if I can find the docs again.