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Re: [babel] Babel filtering: routing policies

Juliusz Chroboczek <jch@irif.fr> Sat, 24 August 2019 09:53 UTC

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Date: Sat, 24 Aug 2019 11:53:16 +0200
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From: Juliusz Chroboczek <jch@irif.fr>
To: "STARK, BARBARA H" <bs7652@att.com>
Cc: 'Mahesh Jethanandani' <mjethanandani@gmail.com>, "'babel@ietf.org'" <babel@ietf.org>
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Subject: Re: [babel] Babel filtering: routing policies
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> In looking at https://tools.ietf.org/html/draft-ietf-rtgwg-policy-model-06,
> I'm left wondering if any of this is useful wrt Babel. I can't see
> anyone implementing the hooks to make such policy configurable in Babel
> (because it doesn't seem to be needed).

Babeld implements quite a bit of this already, see the section "filtering
rules" in the babeld documentation.  BIRD uses an even richer language, see

  https://bird.network.cz/?get_doc&v=20&f=bird-5.html

There's a human-readable description here:

  https://tools.ietf.org/html/draft-ietf-babel-rfc6126bis-14#appendix-C

(Which it's not too late to proof-read, by the way.)

The question, of course, is whether we want to model that in a unusual
object model encoded over XML, or whether it can remain an implementation
detail.  I'm not going to bore you with my opinion (since you already know
my take on unusual object models encoded in XML).

-- Juliusz

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