Hi Yuanxiang,

Please see in-line.

Cheers,
Tianran

-----Original Message-----
From: Qiuyuanxiang [mailto:[email protected]] 
Sent: Monday, June 7, 2021 4:17 PM
To: Wangyali(Yali,Data Communication Standards and Patents Dept) 
<[email protected]>; [email protected]
Cc: Haoyu Song <[email protected]>; Tianran Zhou <[email protected]>
Subject: 答复: [spring] [Spring] A new draft on data fields encapsulation model 
of IOAM TLV in SRv6 network

Hi yali,
Thank you very much for informing me of the existing 
draft-song-ippm-ioam-tunnel-mode-00.

For draft-song-ippm-ioam-tunnel-mode-00, I have a little question, which is 
also the problem that bothers me when I write 
draft-qiu-spring-srv6-ioam-encap-model-00.

In uniform model, draft-song-ippm-ioam-tunnel-mode-00 uses the method of 
copying the original header directly. But for some reason, it may not be 
possible to know in advance how many routers are in the tunnel, Whether this 
method works for Pre-allocated Trace Option-Type may require further 
discussion. We may need to specify usage scenarios for Uniform model.

ZTR> It looks you raised an valid issue. What's your suggestion on this? Do you 
want to propose a solution to solve this, or do you want to describe this as 
operational considerations or so?

In addition, would it be better to selectively partially synchronize the data 
fields of the IOAM TLV instead of full copies? 
For data field that needs to be modified hop-by-hop, we still need to modify 
the data after copying it, which will increases data plane processing. For 
example, the time delay needs to be calculated on the router, and the packet 
carries a timestamp, which needs to be modified by hop.

ZTR> So, what’s your suggestion in detail?
Thanks.

Best Regards,
yuanxiang


-----邮件原件-----
发件人: Wangyali(Yali,Data Communication Standards and Patents Dept) 
[mailto:[email protected]] 
发送时间: 2021年6月4日 18:37
收件人: qiuyuanxiang (RD) <[email protected]>; [email protected]
抄送: Haoyu Song <[email protected]>; Tianran Zhou <[email protected]>
主题: RE: [spring] [Spring] A new draft on data fields encapsulation model of 
IOAM TLV in SRv6 network

Hi authors,

Glad to see you're also interested in this topic. 

Almost 3 years ago, there was a draft-song-ippm-ioam-tunnel-mode-00 we proposed 
to discuss the procedure of iOAM processing in tunnels with the uniform model 
and the pipe model. 

Welcome to join the discussion. Please feel free to let us know your comments 
and questions.

Best,
Yali

-----Original Message-----
From: Qiuyuanxiang [mailto:[email protected]] 
Sent: Friday, June 4, 2021 11:33 AM
To: [email protected]
Subject: [spring] [Spring] A new draft on data fields encapsulation model of 
IOAM TLV in SRv6 network

Hi WG,

Recently we published a new draft on data fields encapsulation model of IOAM 
TLV in SRv6 network:

URL:            
https://www.ietf.org/archive/id/draft-qiu-spring-srv6-ioam-encap-model-00.txt
Status:         
https://datatracker.ietf.org/doc/draft-qiu-spring-srv6-ioam-encap-model/
Htmlized:       
https://datatracker.ietf.org/doc/html/draft-qiu-spring-srv6-ioam-encap-model

It introduces the data fields encapsulation model of IOAM TLV for the Segment 
Routing headend with H.Encaps encapsulation behavior in SRv6 network.

Your review and comments are welcome.

Best regards,
Yuanxiang

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