Re: [Bier] A comment about draft-xzlnp-bier-ioam

["Jeffrey (Zhaohui) Zhang" <[e-mail]>]

Hi Tianran,

BIER is not necessarily always be either with MPLS or IPv6.
Even with BIER-MPLS, where the label just identifies BIER header and BIFT to use, it may not be good to put BIER extension headers as part of the MPLS extension headers.
Also notice that I am not just talking about IOAM, but any extension header that BIER may need.

Jeffrey



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From: Tianran Zhou <zhoutianran=[e-mail]>
Sent: Saturday, March 19, 2022 2:58 PM
To: xiao.min2 <[e-mail]>; Jeffrey (Zhaohui) Zhang <[e-mail]>
Cc: bier <[e-mail]>
Subject: RE: [Bier] A comment about draft-xzlnp-bier-ioam

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I have concern about so many options for the same functionality.

Especially, there’s already IOAM encapsulation for MPLS and IPv6. Why we need another encapsulation in BIER layer?
As far as I understand, BIER will always be used with MPLS or IPv6.

Tianran


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发件人： xiao.min2<[e-mail]<mailto:[e-mail]>>
收件人： zzhang=40juniper.net<zzhang=[e-mail]<mailto:zzhang=[e-mail]>>
抄送： bier<[e-mail]<mailto:[e-mail]>>
主题： Re: [Bier] A comment about draft-xzlnp-bier-ioam
时间： 2022-03-19 14:33:01

Hi Jeffrey,

Thank you for bringing it up to our attention.
I do agree your GDF draft provides a third option on how to encapsulate IOAM over BIER, which is different from the two options already described and compared in this BIER-IOAM draft.
To my understanding, the initial and main motivation to introduce GDF is to provide a fragmentation header for MPLS/BIER etc, just like IPv6 FH.
With that in mind, one possible way to push this "Encapsulating IOAM in BIER" work forward is to add the third option into BIER-IOAM draft for comparison, that makes it focused and easy to follow.
What's your opinion?

Best Regards,
Xiao Min

------------------原始邮件------------------
发件人：Jeffrey(Zhaohui)Zhang
收件人：'[e-mail]';[e-mail];
日 期 ：2022年03月18日 20:56
主 题 ：[Bier] A comment about draft-xzlnp-bier-ioam
Hi,
For IOAM data in BIER, I want to point out that we should use a generic header format that can be used for BIER/MPLS/IPv6. The same extension mechanism can be used for other purposes like fragmentation/security, etc..
This was discussed in https://www.ietf.org/archive/id/draft-zzhang-intarea-generic-delivery-functions-02.txt<https://urldefense.com/v3/__https:/www.ietf.org/archive/id/draft-zzhang-intarea-generic-delivery-functions-02.txt__;!!NEt6yMaO-gk!R7TPxlfa1oP3vqc_Y18142hBsptKuDCdDUrWzFcYPW540rTWlmeQdDEDg7zDbxjH$>, and was mentioned in slide #6 of https://datatracker.ietf.org/meeting/112/materials/slides-112-bier-03-bier-slicing-and-differentiation-00<https://urldefense.com/v3/__https:/datatracker.ietf.org/meeting/112/materials/slides-112-bier-03-bier-slicing-and-differentiation-00__;!!NEt6yMaO-gk!R7TPxlfa1oP3vqc_Y18142hBsptKuDCdDUrWzFcYPW540rTWlmeQdDEDg18F-SAF$> in IETF112 BIER session.
Thanks.
Jeffrey
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