[babel] info model: configurability of intervals

"STARK, BARBARA H" <bs7652@att.com> Wed, 24 February 2021 16:44 UTC

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From: "STARK, BARBARA H" <bs7652@att.com>
To: "'babel@ietf.org'" <babel@ietf.org>
Thread-Topic: info model: configurability of intervals
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Date: Wed, 24 Feb 2021 16:43:55 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/babel/s2Qfl1cslSzHnZixTpZYd7Zi9gk>
Subject: [babel] info model: configurability of intervals
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Hi Babel,
There's a question about the need to support configurability of interval parameters. Right now, they're all read-only. RFC 8966 indicates they can change, and back in August 2018, we discussed intervals:

https://mailarchive.ietf.org/arch/msg/babel/gIddQkzbIC9djewZ4wPN7BGyBRw/

That particular email says:
===============
[Toke]>>> Both Hello and Update intervals are configurable in Bird,

[Barbara]>> Cool. Do you make them configurable per interface, or globally?

[Toke]> Per interface.

[Juliusz]Same thing in babeld.  (There's also a global value, but it's only used to
configure interfaces that don't have specific values configured.)

(As to IHUs, babeld dynamically computes an interval from the Hello
interval and the estimated loss rate.)
==================
Juliusz indicates in this that IHU intervals are dynamically computed. I can't find it in any of the emails, but I think somehow there was a determination that configuration of all intervals was done by the implementation based on costs/metrics, and that no *external* configuration of intervals was supported (or desirable). Is that accurate, or should intervals be configurable via the info/data models?
Barbara