Re: [Lsr] Prefix Unreachable Announcement Use Cases

Gyan Mishra <hayabusagsm@gmail.com> Tue, 17 November 2020 08:01 UTC

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Tue, 17 Nov 2020 02:54:28 -0500
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To: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>
Cc: Robert Raszuk <robert@raszuk.net>, Aijun Wang <wangaijun@tsinghua.org.cn>, lsr <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>
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Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases
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Thanks Acee for the feedback.

We will add more detail to the use cases.

Gyan

On Mon, Nov 16, 2020 at 3:45 AM Acee Lindem (acee) <acee=
40cisco.com@dmarc.ietf.org> wrote:

> When the PUA use cases were presented today in the LSR meeting, I made the
> comment that the RIB interactions for each use case would be different and
> needed to be specified.
>
> Thanks,
>
> Acee
>
>
>
>
>
> *From: *Robert Raszuk <robert@raszuk.net>
> *Date: *Monday, November 16, 2020 at 3:25 AM
> *To: *Aijun Wang <wangaijun@tsinghua.org.cn>
> *Cc: *Jeff Tantsura <jefftant.ietf@gmail.com>om>, lsr <lsr@ietf.org>rg>, Acee
> Lindem <acee@cisco.com>
> *Subject: *Re: [Lsr] Prefix Unreachable Announcement Use Cases
>
>
>
> I was not bringing RIFT's negative routies example as something inherently
> negative. I was just pointing it out to illustrate that today's data plane
> lookup does not really support "if does not match" checks.
>
> *[WAJ] In data plane, the device do still the “match” check, not “does not
> match” check.  When the router receives the PUA information, it will
> install one black hole route for a short time.*
>
>
>
> So your idea is that you install route for unreachable prefix to /dev/null
> ?
>
>
>
> And how would that help connectivity restoration ?
>
>
>
> Moreover it seems that it will just also prevent any local protection to
> locally bypass the failed destination.
>
>
>
> Bottom line is that I agree with one problem statement. However IMHO
> described actions upon reception of PUA are questionable at best.
>
>
>
> Cheers,
> R.
> _______________________________________________
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> Lsr@ietf.org
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>


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*Gyan Mishra*

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