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Re: [Lsr] Prefix Unreachable Announcement Use Cases

"Acee Lindem (acee)" <acee@cisco.com> Mon, 16 November 2020 08:45 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Robert Raszuk <robert@raszuk.net>, Aijun Wang <wangaijun@tsinghua.org.cn>
CC: Jeff Tantsura <jefftant.ietf@gmail.com>, lsr <lsr@ietf.org>
Thread-Topic: [Lsr] Prefix Unreachable Announcement Use Cases
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Date: Mon, 16 Nov 2020 08:45:26 +0000
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Subject: Re: [Lsr] Prefix Unreachable Announcement Use Cases
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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>, lsr <lsr@ietf.org>, 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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