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Re: [babel] Babel filtering: routing policies

Juliusz Chroboczek <jch@irif.fr> Fri, 23 August 2019 22:27 UTC

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Date: Sat, 24 Aug 2019 00:27:01 +0200
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From: Juliusz Chroboczek <jch@irif.fr>
To: Mahesh Jethanandani <mjethanandani@gmail.com>
Cc: babel@ietf.org, Barbara Stark <bs7652@att.com>
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Subject: Re: [babel] Babel filtering: routing policies
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> In order to make sure we are talking the same language, would you say a given
> chain is equivalent of a “defined set” as defined by
> draft-ietf-rtgwg-policy-model?

No.  A chain would correspond to a sequence of policy statements, if
I read this document right.

> I understand that these are babel specific,

I think that only matching on router-id is Babel-specific, all the others
are fairly generic.

> will extend the policy model to add these chains as “defined sets".

I don't think you need to extend anything.  Matching on router-id is not
essential.

On the other hand, it looks to me like it's more expressive than anything
that any implementation of Babel known to me has ever implemented.  Since
I'm still not sure what's the purpose of the YANG model, I don't know if
that's a problem or not.

>     There exist other actions, more specialised -- see the manual page for
>     details.

> I see two more, src-prefix and table. Is there more?

Not in babeld.  I haven't checked BIRD.

-- Juliusz

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