Re: [Bier] Robert Wilton's No Objection on draft-ietf-bier-bar-ipa-12: (with COMMENT)

"Rob Wilton (rwilton)" <rwilton@cisco.com> Thu, 05 May 2022 16:12 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>, The IESG <iesg@ietf.org>, "'chen.ran@zte.com.cn'" <chen.ran@zte.com.cn>
CC: "draft-ietf-bier-bar-ipa@ietf.org" <draft-ietf-bier-bar-ipa@ietf.org>, "bier-chairs@ietf.org" <bier-chairs@ietf.org>, "bier@ietf.org" <bier@ietf.org>, Greg Mirsky <gregimirsky@gmail.com>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>
Thread-Topic: Robert Wilton's No Objection on draft-ietf-bier-bar-ipa-12: (with COMMENT)
Thread-Index: AQHYU+BkGQML+dam5Ui23uS5shVE+60QcAmAgAAdBsA=
Date: Thu, 5 May 2022 16:12:41 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/TnT0oeOGtY50Pp5SNdfwz-tPKOI>
Subject: Re: [Bier] Robert Wilton's No Objection on draft-ietf-bier-bar-ipa-12: (with COMMENT)
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Hi Jeffrey,

> -----Original Message-----
> From: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
> Sent: 05 May 2022 15:25
> To: Rob Wilton (rwilton) <rwilton@cisco.com>; The IESG <iesg@ietf.org>;
> 'chen.ran@zte.com.cn' <chen.ran@zte.com.cn>
> Cc: draft-ietf-bier-bar-ipa@ietf.org; bier-chairs@ietf.org; bier@ietf.org; Greg
> Mirsky <gregimirsky@gmail.com>; aretana.ietf@gmail.com
> Subject: RE: Robert Wilton's No Objection on draft-ietf-bier-bar-ipa-12: (with
> COMMENT)
> 
> Hi Rob,
> 
> Sorry for the late response. I took some time off work and am catching up on
> delayed work.

No worries.


> 
> Please see zzh> below.
> 
> 
> Juniper Business Use Only
> 
> -----Original Message-----
> From: Robert Wilton via Datatracker <noreply@ietf.org>
> Sent: Tuesday, April 19, 2022 7:27 AM
> To: The IESG <iesg@ietf.org>
> Cc: draft-ietf-bier-bar-ipa@ietf.org; bier-chairs@ietf.org; bier@ietf.org; Greg
> Mirsky <gregimirsky@gmail.com>; aretana.ietf@gmail.com;
> gregimirsky@gmail.com
> Subject: Robert Wilton's No Objection on draft-ietf-bier-bar-ipa-12: (with
> COMMENT)
> 
> [External Email. Be cautious of content]
> 
> 
> Robert Wilton has entered the following ballot position for
> draft-ietf-bier-bar-ipa-12: No Objection
> 
> When responding, please keep the subject line intact and reply to all email
> addresses included in the To and CC lines. (Feel free to cut this introductory
> paragraph, however.)
> 
> 
> Please refer to
> https://urldefense.com/v3/__https://www.ietf.org/about/groups/iesg/state
> ments/handling-ballot-positions/__;!!NEt6yMaO-
> gk!SFxqK7NzdwzMDkjyRUZwmQMJmCf2gkwiZofHioZ4I2KHOk_qeEl2KAaNqe4T
> Xl_8$
> for more information about how to handle DISCUSS and COMMENT
> positions.
> 
> 
> The document, along with other ballot positions, can be found here:
> https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-bier-
> bar-ipa/__;!!NEt6yMaO-
> gk!SFxqK7NzdwzMDkjyRUZwmQMJmCf2gkwiZofHioZ4I2KHOk_qeEl2KAaNqY7Y
> Wk4T$
> 
> 
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> Hi,
> 
> Thanks for this.
> 
> A few minor comments:
> 
> (1)
>    This document specifies general rules for the interaction between the
>    BIER Algorithm (BAR) and the IGP Algorithm (IPA) used for underlay
>    path calculation when other BAR and/or IPA values are used.
> 
> I wondered whether it would helpful to clarify that "other" means "non
> zero", e.g., "when other (i.e., non zero) BAR and/or IPA values are used"
> 
> Zzh> Done. Will post the revision once comments from others are also
> addressed.
> 
> (2)
>    When a BAR value is defined, the corresponding BA and BC semantics
>    SHOULD be specified.  For an IGP Algorithm to be used as a BIER IPA,
>    its RA and RC semantics SHOULD be specified.
> 
> Under what conditions can these SHOULDs be violated, or to state it another
> way, why are they not MUSTs?
> 
> Zzh> They are not MUSTs to allow some flexibility in the specification of
> BAR/IPA. If one is not specified, then it is interpreted as NULL.
> 
> (3) I note that this document doesn't have, or reference, any YANG, but
> presumably these two fields are covered by igp-algorithm and bier-algorithm
> in draft-ietf-bier-bier-yang-07?  Not this document, but it would be useful if
> those fields included this RFC-to-be in a reference statement for those two
> fields, perhaps with slightly enhanced descriptions to give some indication of
> how the fields work together.  You might also consider including an
> informational reference to where the YANG management interface of these
> two fields is defined, but I'll leave that to the authors discretion.
> 
> Zzh> draft-ietf-bier-bier-yang does have BAR/IPA. Since this document
> focuses on how BAR/IPA interact not on how they're configured/monitored,
> I'm inclined not to mention YANG here. I am copying the main author of the
> YANG document so that they can update the descriptions to be consistent.

Okay.

Regards,
Rob


> 
> module: ietf-bier
>   augment /rt:routing:
>     +--rw bier
>         ...
>        |  +--rw igp-algorithm?            uint8
>        |  +--rw bier-algorithm?           uint8
> 
> Zzh> Thanks!
> Zzh> Jeffrey
> 
> Regards,
> Rob
>