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Re: [Idr] I-D Action: draft-ietf-idr-rs-bfd-03.txt

Robert Raszuk <robert@raszuk.net> Tue, 04 July 2017 09:02 UTC

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From: Robert Raszuk <robert@raszuk.net>
Date: Tue, 04 Jul 2017 11:02:55 +0200
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To: "John G. Scudder" <jgs@juniper.net>
Cc: Job Snijders <job@ntt.net>, idr wg <idr@ietf.org>
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Subject: Re: [Idr] I-D Action: draft-ietf-idr-rs-bfd-03.txt
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John,

Today vast majority of OPEN policy clients share single RS view/table so
you do best path and update generation once for all of them.

The moment you introduce per client state you are braking those apart into
individual views.

Even those with policy today have subset of nets in their own tables not
all. So this optimization also goes away.

So if you send clients real paths they locally can repair failures without
any additional state per client on RS. That is why I called it "a waist".

And this is not 100 it is 100 x number of clients say 1000 of dynamic state
which triggers 1000 best paths and update generations on propagated
failures of best path.

Thx
R.

On Jul 4, 2017 03:07, "John Scudder" <jgs@juniper.net> wrote:

> On Jul 3, 2017, at 6:22 PM, Robert Raszuk <robert@raszuk.net> wrote:
> >
> > What happens when RS gets 100 paths for policy eligible net for a given
> client ?
> >
> > Client will enable waist
>
> Waist?
>
> > of 100 bfd sessions and what is much worse will report state of those
> 100 next hops to RS ?
>
> Unclear to me why reporting 100 next hops is so bad?
>
> > This is so bad ....
>
> Perhaps you can elaborate on why you think so.
>
> --John

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