Re: [Cbor] Supporting IPv6 Link-Local with scope (was Re: Éric Vyncke's Discuss on draft-ietf-cbor-network-addresses-09: (with DISCUSS and COMMENT))

Jürgen Schönwälder <j.schoenwaelder@jacobs-university.de> Thu, 07 October 2021 06:44 UTC

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Date: Thu, 7 Oct 2021 08:43:38 +0200
From: =?utf-8?B?SsO8cmdlbiBTY2jDtm53w6RsZGVy?= <j.schoenwaelder@jacobs-university.de>
To: Carsten Bormann <cabo@tzi.org>
Cc: Michael Richardson <mcr+ietf@sandelman.ca>, =?utf-8?B?w4lyaWM=?= Vyncke <evyncke@cisco.com>, cbor@ietf.org, The IESG <iesg@ietf.org>, Donald Eastlake <d3e3e3@gmail.com>, Barry Leiba <barryleiba@computer.org>, cbor-chairs@ietf.org, Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [Cbor] =?utf-8?q?Supporting_IPv6_Link-Local_with_scope_=28was_Re?= =?utf-8?q?=3A_=C3=89ric_Vyncke=27s_Discuss_on_draft-ietf-cbor-network-add?= =?utf-8?q?resses-09=3A_=28with_DISCUSS_and_COMMENT=29=29?=
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On Thu, Oct 07, 2021 at 03:40:24AM +0200, Carsten Bormann wrote:
> On 7. Oct 2021, at 00:44, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> > 
> > That's probably because there are none. As far as I know, there is no
> > "Scoped architecture for IPv4" RFC. I don't know why there is YANG support.
> 
> Zones are this gift that keeps on giving.
> 
> If we are doing zones, we need to do them like YANG.
> I would have a strong objection against including them but then doing them differently.
> Maybe we should simply reference RFC 6991 as well.
> 
> Jürgen:  Do you remember why ipv4-address has a zone ID (called “zone index”)?
>

The YANG definitions were derived from the SNMP definitions. I think
the first RFC having support for zoned IPv4 addresses in the network
management world was RFC 2851 (published June 2000). I vaguely recall
that we had several side meetings during the draft writing stage where
people pointed to other work (that may have led to things like RFC
3927 later on) and/or they pointed out that the need to disambiguate
IP addresses also exists in the IPv4 world. I think people also
pointed to routers running multiple links using the same non-global
(e.g., private) address spaces.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>