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Re: [netmod] usage of ip-address in openconfig

"Acee Lindem (acee)" <acee@cisco.com> Wed, 20 April 2022 23:02 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Jürgen Schönwälder <j.schoenwaelder@jacobs-university.de>, Andy Bierman <andy@yumaworks.com>
CC: NetMod WG <netmod@ietf.org>
Thread-Topic: [netmod] usage of ip-address in openconfig
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Date: Wed, 20 Apr 2022 23:00:57 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/Ep-ZxEzoR_2dpkFSekOtfkFJP3M>
Subject: Re: [netmod] usage of ip-address in openconfig
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On 4/20/22, 6:35 PM, "netmod on behalf of Jürgen Schönwälder" <netmod-bounces@ietf.org on behalf of j.schoenwaelder@jacobs-university.de> wrote:

    On Wed, Apr 20, 2022 at 02:51:35PM -0700, Andy Bierman wrote:
    > On Wed, Apr 20, 2022 at 2:34 PM Jürgen Schönwälder <
    > j.schoenwaelder@jacobs-university.de> wrote:
    > 
    > > I am not sure it helps to look at individual data models but since
    > > openconfig is often presented as getting things right, here is what I
    > > find in openconfig-system-logging.yang
    > >
    > Not sure why this missing feature is relevant.

    I suggest that people questioning the need to support scoped IPv6
    addresses in IETF YANG data models write an I-D explaining why IETF
    YANG data models do not need to support scoped IPv6 addresses and pass
    the I-D through the IPv6 working group.

The question is not whether there is a single use case for IPv6 link local addresses with a zone. The question is whether the base pattern for IPv6 addresses should include a zone and whether one was expected for all the existing YANG model usages of inet:ipv6-address. I think that given the very narrow scope, the answer is clearly no.  Additionally, the zone is only applicable to IPv6 link-local addresses yet the pattern in RFC 6991 allows the zone for ALL IPv6 addresses. This is also clearly wrong. 

Do you at least admit that IPv4 link-scoped addresses with zone have no useful purpose? Or are you going to try and argue that the ever-popular 169.254.0.0/16 addresses are an absolute requirement for YANG models and expected for every usage of inet:ipv4-address? 

Acee
P.S. I would add that it is a good thing that syslog server can't be mapped to a link-local address with a zone in the Open-Config model. In general, IPv6 services such as syslog servers should be mapped to global IPv6 addresses. 


    /js

    -- 
    Jürgen Schönwälder              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/>

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