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Re: [Lsr] Thoughts about PUAs - are we not over-engineering?

"Acee Lindem (acee)" <acee@cisco.com> Tue, 14 June 2022 13:57 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Robert Raszuk <robert@raszuk.net>, Christian Hopps <chopps@chopps.org>
CC: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, lsr <lsr@ietf.org>, "draft-ppsenak-lsr-igp-ureach-prefix-announce@ietf.org" <draft-ppsenak-lsr-igp-ureach-prefix-announce@ietf.org>, draft-wang-lsr-prefix-unreachable-annoucement <draft-wang-lsr-prefix-unreachable-annoucement@ietf.org>
Thread-Topic: [Lsr] Thoughts about PUAs - are we not over-engineering?
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Date: Tue, 14 Jun 2022 13:57:09 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/A3OI6IhJxUM5jbOmXtKz2vZTwOI>
Subject: Re: [Lsr] Thoughts about PUAs - are we not over-engineering?
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X-List-Received-Date: Tue, 14 Jun 2022 13:57:17 -0000

Speaking as WG member:

From: Lsr <lsr-bounces@ietf.org> on behalf of Robert Raszuk <robert@raszuk.net>
Date: Tuesday, June 14, 2022 at 9:27 AM
To: Christian Hopps <chopps@chopps.org>
Cc: Gunter Van de Velde <gunter.van_de_velde@nokia.com>, lsr <lsr@ietf.org>, "draft-ppsenak-lsr-igp-ureach-prefix-announce@ietf.org" <draft-ppsenak-lsr-igp-ureach-prefix-announce@ietf.org>, draft-wang-lsr-prefix-unreachable-annoucement <draft-wang-lsr-prefix-unreachable-annoucement@ietf.org>
Subject: Re: [Lsr] Thoughts about PUAs - are we not over-engineering?

All,

> What is wrong with simply not doing summaries

What's wrong is that you are reaching the scaling issue much sooner than when you inject summaries.

Note that any good implementation will allow one to punch holes in their area ranges so that critical prefixes are advertised or included in the range existence criteria.

Thanks,
Acee


Note that the number of those host routes is flooded irrespective of the actual need everywhere based on the sick assumption that perhaps they may be needed there. There is no today to the best of my knowledge controlled leaking to only subset to what is needed.

But this is not the main worry. Main worry is that in redundant networks you are seeing many copies of the very same route being flooded all over the place. So in a not so big 1000 node network the number of host routes may exceed 8000 easily. cri

Sure when things are stable all is cool. But we should prepare for the worst, not the best. In fact, the ability to encapsulate to an aggregate switch IP (GRE or UDP) or nowadays SRv6 has been one of the strongest advantages.

So as started before the problem does exist. Neither PULSE nor PUE solve it which are both limited to PE failures detection which is not enough (maybe even not worth). But PE-CE failures need to be signalled in the case of injecting summaries. Maybe as I said in previous msg just BGP withdrawal is fine. If not we should seek a solution which addresses the real problem, not an infrequent one.

Best,
R.



On Tue, Jun 14, 2022 at 2:51 PM Christian Hopps <chopps@chopps.org<mailto:chopps@chopps.org>> wrote:


> On Jun 14, 2022, at 04:59, Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.com<mailto:gunter.van_de_velde@nokia.com>> wrote:
>
> What is wrong with simply not doing summaries and forget about these PUAs to pinch holes in the summary prefixes? this worked very well during last two decennia. Are we not over-engineering with PUAs?

100% yes, IMO.

Thanks,
Chris.
[as wg-member]
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