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Re: [Int-dir] Intdir telechat review of draft-ietf-bier-bar-ipa-12

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Wed, 04 May 2022 19:30 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Suresh Krishnan <suresh.krishnan@gmail.com>, "int-dir@ietf.org" <int-dir@ietf.org>
CC: "bier@ietf.org" <bier@ietf.org>, "draft-ietf-bier-bar-ipa.all@ietf.org" <draft-ietf-bier-bar-ipa.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>
Thread-Topic: Intdir telechat review of draft-ietf-bier-bar-ipa-12
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Archived-At: <https://mailarchive.ietf.org/arch/msg/int-dir/JEPWq3Ut22y4TzJZpGjypKSjXRk>
Subject: Re: [Int-dir] Intdir telechat review of draft-ietf-bier-bar-ipa-12
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Hi Suresh,

Thanks for your review and comments. I took some time off and am finally getting back to this.
Please see zzh> below.


Juniper Business Use Only

-----Original Message-----
From: Suresh Krishnan via Datatracker <noreply@ietf.org> 
Sent: Monday, April 18, 2022 11:54 PM
To: int-dir@ietf.org
Cc: bier@ietf.org; draft-ietf-bier-bar-ipa.all@ietf.org; last-call@ietf.org
Subject: Intdir telechat review of draft-ietf-bier-bar-ipa-12

[External Email. Be cautious of content]


Reviewer: Suresh Krishnan
Review result: Ready with Issues

This document is short and clear and easy to understand for someone who has a basic understanding of BIER. I do have one minor issue that probably needs to get addressed/clarified

* Section 3:

Step 3: "If BA is NULL" -> What exactly does this mean? Does this mean BAR==0?

Zzh> Note that a BAR value corresponds to a <BA, BC> (<BIER algorithm, BIER constraints>) tuple. "BA is NULL" only means it does not specify any BIER specific algorithm.
Zzh> A NULL BA does not mean BAR==0. For example, one could define a BAR 10 with semantics of "No BIER specific algorithm but exclude BIER-incapable routers" (the exclusion part is the BC).

If so, it might be good to state this explicitly and I suggest pulling forward the text from Section 3.1. to clarify BAR==0 means that BA is NULL and BC is NULL. If not, can you please clarify? i.e. do you expect there to be a NULL BA with a BAR<>0?

Zzh> As mentioned above, a non-zero BAR could have a null BA.
Zzh> Section 3.1 clarifies BAR 0 specifically, while the steps focus on the <algorithm, constraints> components of BAR and IPA, so I hope we can just leave the text as is?
Zzh>Thanks!
Zzh> Jeffrey

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