Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02

["Joel M. Halpern" <[e-mail]>]

Robert, you seem to be asking that we pass full information about the 
dynamic network state to all routers so that they can, if needed, serve 
as fully intelligent path computation engines.  If you want to do that, 
you will need more than just the telemetry.  You will need the demands 
that are coming in to all of those routers, so that you can make global 
decisions sensibly.
Which is why we use quasi-centralized path computation engines.

Yours,
Joel

On 4/2/2020 6:16 PM, Robert Raszuk wrote:
> 
>      > If you consider such constrains to provide reachability for
>     applications you will likely see value that in-situ telemetry is
>     your friend here. Really best friend as without him you can not do
>     the proper end to end path exclusion for SPT computations..
> 
>     [as wg member] Are you thinking that shifting traffic to a router is
>     not going to affect it's jitter/drop rate?
> 
> 
> Well this is actually the other way around.
> 
> First you have your default topology. They you are asked to 
> construct new one based on applied constrains.
> 
> So you create complete TE coverage and start running end to end data 
> plane probing over all TE paths (say SR-TE for specific example). Once 
> you start collecting the probe results you can start excluding paths 
> which do not meet your applied constraints. And that process continues.
> 
> To your specific question - It is not that unusual where routers degrade 
> their performance with time and in many cases the traffic is not the 
> cause for it but internal bugs and malfunctions.
> 
> Best,
> R.
> 
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