[spring] 答复: [Spring] A new draft on data fields encapsulation model of IOAM TLV in SRv6 network

[Qiuyuanxiang <[e-mail]>]

Hi Tianran,

My idea is that need to explicitly add scenarios for the Uniform model. If the Trace Option-type in the original packet is Pre-allocated or Edge-to-Edge, Uniform model does not work, and even does not encapsulate the outer iOAM header.
The reason why Edge-to-Edge Trace Option-type doesn't work is that, if the outer iOAM header directly copies the inner one, the tunnel egress will mistakenly assume it is the iOAM end node when it decapsulates the outer header, and reports data to the analyzer.

The second suggested changing "copy" to "selectively partially synchronize ", and lists data fields that must be synchronized, such as FlowMonID, IOAM-Trace-Type, and so on.

Best Regards,
Yuanxiang


-----邮件原件-----
发件人: Tianran Zhou [mailto:[e-mail]] 
发送时间: 2021年6月8日 9:12
收件人: qiuyuanxiang (RD) <[e-mail]>; Wangyali(Yali,Data Communication Standards and Patents Dept) <[e-mail]>; [e-mail]
抄送: Haoyu Song <[e-mail]>
主题: RE: [spring] [Spring] A new draft on data fields encapsulation model of IOAM TLV in SRv6 network

Hi Yuanxiang,

Please see in-line.

Cheers,
Tianran

-----Original Message-----
From: Qiuyuanxiang [mailto:[e-mail]] 
Sent: Monday, June 7, 2021 4:17 PM
To: Wangyali(Yali,Data Communication Standards and Patents Dept) <[e-mail]>; [e-mail]
Cc: Haoyu Song <[e-mail]>; Tianran Zhou <[e-mail]>
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:[e-mail]] 
发送时间: 2021年6月4日 18:37
收件人: qiuyuanxiang (RD) <[e-mail]>; [e-mail]
抄送: Haoyu Song <[e-mail]>; Tianran Zhou <[e-mail]>
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:[e-mail]] 
Sent: Friday, June 4, 2021 11:33 AM
To: [e-mail]
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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