Re: [ippm] New Version Notification for draft-ahuang-ippm-dex-timestamp-ext-00.txt

[Haoyu Song <[e-mail]>]

As long as the optional fields are of fixed length (better to be 4 octets aligned) there will be no ambiguity. My personal opinion is that the limitation can be relaxed.

Haoyu

From: Alex Huang Feng <[e-mail]>
Sent: Thursday, February 16, 2023 2:01 AM
To: Haoyu Song <[e-mail]>
Cc: [e-mail]; Pierre Francois <[e-mail]>
Subject: Re: [ippm] New Version Notification for draft-ahuang-ippm-dex-timestamp-ext-00.txt

Hi Haoyu,

Thanks for your feedback.
I actually agree with your statement but the only reason I did it using 2 bits is because in IOAM DEX (RFC9326) section 3.2, there is a statement saying each Optional field is 4 octets long:

Optional fields:
The optional fields, if present, reside after the Reserved field. The order of the optional fields is according to the order of the respective bits, starting from the most significant bit, that are enabled in the Extension-Flags field. Each optional field is 4 octets long.

There is no MUST in the section, so I did not know how to interpret this. Maybe you have more insights on this.

Cheers,
Alex


On 15 Feb 2023, at 18:47, Haoyu Song <[e-mail]<mailto:[e-mail]>> wrote:

Hi Alex,

This method allows the direct delay measurement in data plane which could be useful for some applications. The extension is also simple and straightforward.
I have just one concern: the timestamp seconds and fraction are defined as two optional field and the timestamp seconds could be the only field used. However, I don't think it would be useful for delay measurement if only the seconds appears. So maybe it's more reasonable to consider them both as just one timestamp field and save a flag bit.

Thanks,
Haoyu

-----Original Message-----
From: ippm <[e-mail]<mailto:[e-mail]>> On Behalf Of Alex Huang Feng
Sent: Wednesday, February 15, 2023 3:30 AM
To: [e-mail]<mailto:[e-mail]>
Cc: Pierre Francois <[e-mail]<mailto:[e-mail]>>
Subject: Re: [ippm] New Version Notification for draft-ahuang-ippm-dex-timestamp-ext-00.txt

Dear IPPM WG,

I would like to present this draft which addresses a missing timestamp in the IOAM Direct Export (DEX) option header.

This timestamp extension allows computing the delay between the encapsulation node and the transit or decapsulation node in IOAM DEX Option.

On behalf of the authors, I would like to request your feedback on this draft.

Cheers,
Alex



On 15 Feb 2023, at 12:27, [e-mail]<mailto:[e-mail]> wrote:


A new version of I-D, draft-ahuang-ippm-dex-timestamp-ext-00.txt
has been successfully submitted by Alex Huang Feng and posted to the
IETF repository.

Name:                         draft-ahuang-ippm-dex-timestamp-ext
Revision:       00
Title:                            Timestamp extension for In Situ Operations, Administration, and Maintenance (IOAM) Direct Export
Document date:           2023-02-15
Group:                         Individual Submission
Pages:                         6
URL:            https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-ahuang-ippm-dex-timestamp-ext-00.txt&data=05%7C01%7Chaoyu.song%40futurewei.com%7Cfd4793f6908340b88ac308db0f47ff29%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C638120574175820201%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=2iaKat5H9LbLvGCML2Cwrgr14pCivah5y4mH%2BNIgKkA%3D&reserved=0<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.ietf.org%2Farchive%2Fid%2Fdraft-ahuang-ippm-dex-timestamp-ext-00.txt&data=05%7C01%7Chaoyu.song%40futurewei.com%7C7c4ae2c016124a1556b508db1004d9e9%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C638121385272151587%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=vTJCUjqB43pv079CLXwoz08%2F6eUd8KHu3BkZsib02F0%3D&reserved=0>
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Abstract:
 This document extends the In Situ Operations, Administration, and
 Maintenance (IOAM) Direct Export option type to support timestamping
 by adding and defining two optional timestamp fields and
 corresponding flags.





The IETF Secretariat


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