[j-nsp] What exactly causes inconsistent RTT seen using ping utility in Junos?

[James Bensley]

On Thu, 25 Apr 2019 at 08:49, Tarko Tikan <tarko at lanparty.ee> wrote:
>
> hey,
>
> > Please let me know if anything was unclear or if someone has other
> > ideas or theories.
>
> Been following this thread and do not have anything to contribute at
> this point but wanted to say I (and I hope many others) appreciate this
> type of proper debugging given the tools we have available these days.

I agree, this has been interesting to read and a commendable level of
debugging has been carried out, however I'm not sure why.

There are 100 different reasons why packets could be delayed when
passing through the RE as opposed to the forwarding plane.

Trying to debug which one is causing this specific issue seems like a
dog chasing his tail. Once the cause has been identified, and
resolved, after the next software update something else will trigger
the same unwanted behaviour :)

The transit forwarding path through the router has a much more
strictly bound packet processing loop than the RE so I wouldn't really
be relying on it for anything.

Cheers,
James.