Re: [Technical Errata Reported] RFC9067 (6844)

"Acee Lindem (acee)" <acee@cisco.com> Fri, 11 February 2022 18:13 UTC

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: RFC Errata System <rfc-editor@rfc-editor.org>, "yingzhen.qu@futurewei.com" <yingzhen.qu@futurewei.com>, "jefftant.ietf@gmail.com" <jefftant.ietf@gmail.com>, "xufeng.liu.ietf@gmail.com" <xufeng.liu.ietf@gmail.com>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "jgs@juniper.net" <jgs@juniper.net>, "martin.vigoureux@nokia.com" <martin.vigoureux@nokia.com>, "yingzhen.ietf@gmail.com" <yingzhen.ietf@gmail.com>
CC: "kris@netedge.plus" <kris@netedge.plus>, "rtgwg@ietf.org" <rtgwg@ietf.org>
Subject: Re: [Technical Errata Reported] RFC9067 (6844)
Thread-Topic: [Technical Errata Reported] RFC9067 (6844)
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Date: Fri, 11 Feb 2022 18:13:04 +0000
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This is a legitimate problem for 0.0.0.0/0 given that all components of a list key are required. In the case of a prefix-list, the prefix and mask length limits are all part of the key and, hence, required. It will need to be fixed in a BIS version or augmentation allowing separate list dependent on what is specified (such is done in our Cisco IOS-XE native model): 

https://github.com/YangModels/yang/blob/master/vendor/cisco/xe/1771/Cisco-IOS-XE-ip.yang#L2888

It would be nice if YANG supported lists with variable length keys. 

Thanks,
Acee


On 2/10/22, 12:10 PM, "RFC Errata System" <rfc-editor@rfc-editor.org> wrote:

    The following errata report has been submitted for RFC9067,
    "A YANG Data Model for Routing Policy".

    --------------------------------------
    You may review the report below and at:
    https://www.rfc-editor.org/errata/eid6844

    --------------------------------------
    Type: Technical
    Reported by: Kris Lambrechts <kris@netedge.plus>

    Section: 7.2. grouping prefix

    Original Text
    -------------
           leaf mask-length-upper {
             type uint8 {
               range "1..128";
             }


    Corrected Text
    --------------
           leaf mask-length-upper {
             type uint8 {
               range "0..128";
             }


    Notes
    -----
    With the original definition, it is not possible to specify an exact match for the default routes (0.0.0.0/0 and ::/0) which is a valid use case.

    Instructions:
    -------------
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    --------------------------------------
    RFC9067 (draft-ietf-rtgwg-policy-model-31)
    --------------------------------------
    Title               : A YANG Data Model for Routing Policy
    Publication Date    : October 2021
    Author(s)           : Y. Qu, J. Tantsura, A. Lindem, X. Liu
    Category            : PROPOSED STANDARD
    Source              : Routing Area Working Group
    Area                : Routing
    Stream              : IETF
    Verifying Party     : IESG