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Re: [Idr] One Administrative Domain using BGP (Fwd: I-D Action: draft-uttaro-idr-bgp-oad-00.txt)

Alvaro Retana <alvaro.retana@futurewei.com> Mon, 13 March 2023 17:34 UTC

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From: Alvaro Retana <alvaro.retana@futurewei.com>
To: Gert Doering <gert@space.net>
CC: "idr@ietf.org" <idr@ietf.org>, "draft-uttaro-idr-bgp-oad@ietf.org" <draft-uttaro-idr-bgp-oad@ietf.org>
Thread-Topic: [Idr] One Administrative Domain using BGP (Fwd: I-D Action: draft-uttaro-idr-bgp-oad-00.txt)
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Date: Mon, 13 Mar 2023 17:34:28 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/KT1m0pekGJAjiHhxhjewimUm_yM>
Subject: Re: [Idr] One Administrative Domain using BGP (Fwd: I-D Action: draft-uttaro-idr-bgp-oad-00.txt)
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On March 13, 2023 at 12:53:45 PM, Gert Doering wrote:

Gert:

Hi!

> On Mon, Mar 13, 2023 at 03:46:54PM +0000, Alvaro Retana wrote:
> > As the name suggests, it is a session between two different ASNs that
> > belong to the same operator. Many idr documents call this grouping a Single
> > Administrative Domain, we're calling it One Administrative Domain (OAD).
>
> Isn't this what Confederations are doing today?

Not exactly.

This draft is (currently) focussed on the definition of a session type.  There are applications where a single session (to a stub AS, for example) is enough.

If the EBGP-OAD session is used for all inter-AS peerings in the same OAD, then the result is similar.  As Igor mentioned, one of the outcomes is that the AS_PATH doesn't change.  This fact allows for incremental (but very careful) deployment of the EBGP-OAD sessions "as needed" without the pain that moving to confederations results in.

We haven't included the considerations around wider (OAD-wide, for example) deployments of the EBGP-OAD session in this draft -- we ran out of time.  These should include migration, partial deployments, etc.  We are considering whether that would be better in a separate document or not.

Thanks!

Alvaro.

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