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Re: [ippm] Second WGLC for draft-ietf-ippm-ioam-data

"Frank Brockners (fbrockne)" <fbrockne@cisco.com> Fri, 29 May 2020 08:04 UTC

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From: "Frank Brockners (fbrockne)" <fbrockne@cisco.com>
To: "xiao.min2@zte.com.cn" <xiao.min2@zte.com.cn>, "ippm@ietf.org" <ippm@ietf.org>, "tpauly=40apple.com@dmarc.ietf.org" <tpauly=40apple.com@dmarc.ietf.org>
Thread-Topic: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
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Date: Fri, 29 May 2020 08:04:48 +0000
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Subject: Re: [ippm] Second WGLC for draft-ietf-ippm-ioam-data
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Hi Xiao Min,

my understanding is that there are devices which can calculate transit delay, which is why the field was introduced quite a while ago.
draft-ietf-ippm-ioam-data already includes an option to timestamp packets (see e.g. sections 4.4.2 and 4.6 in draft-ietf-ippm-ioam-data-09) which you can use exactly the same way as you propose below, i.e. you can use the timestamp field for the time, at which the packet was transmitted by the node. What draft-ietf-ippm-ioam-data asks you to do is to properly document when you timestamp the packet.

Cheers, Frank

From: ippm <ippm-bounces@ietf.org> On Behalf Of xiao.min2@zte.com.cn
Sent: Freitag, 15. Mai 2020 09:51
To: ippm@ietf.org; tpauly=40apple.com@dmarc.ietf.org
Subject: Re: [ippm] Second WGLC for draft-ietf-ippm-ioam-data


Hi all,



I have a comment on this draft.

I was told by the implementers of my company that it's difficult to add accurate transit delay into the trace option data. The reason is that in order to calculate transit delay, the node firstly needs to obtain the time at which the packet is transmitted by the node, which is obtained at PHY layer, otherwise, the node can't do any calculation after the time is obtained.

If the above issue is common across different implementations, I suggest to substitute the "transit delay" with '"timestamp" of the time at which the packet is transmitted by the node.



Best Regards,

Xiao Min
原始邮件
发件人：TommyPauly <tpauly=40apple.com@dmarc.ietf.org<mailto:tpauly=40apple.com@dmarc.ietf.org>>
收件人：IETF IPPM WG <ippm@ietf.org<mailto:ippm@ietf.org>>;
日 期 ：2020年05月15日 01:16
主 题 ：[ippm] Second WGLC for draft-ietf-ippm-ioam-data
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Hi IPPM,

At our virtual interim meeting, we decided to put draft-ietf-ippm-ioam-data through a second last call, based on the new revisions, in mid-May. This email starts a two-week WGLC for this draft.

The latest version can be found here: https://tools.ietf.org/html/draft-ietf-ippm-ioam-data-09

This last call will end on Thursday, May 28. Please reply to ippm@ietf.org<mailto:ippm@ietf.org> with your reviews and comments.

Thanks,
Tommy & Ian

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