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Re: [ippm] Enhanced Alternate Marking draft-zhou-ippm-enhanced-alternate-marking-07

Tianran Zhou <zhoutianran@huawei.com> Mon, 25 October 2021 03:25 UTC

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From: Tianran Zhou <zhoutianran@huawei.com>
To: Greg Mirsky <gregimirsky@gmail.com>
CC: "IETF IPPM WG (ippm@ietf.org)" <ippm@ietf.org>
Thread-Topic: [ippm] Enhanced Alternate Marking draft-zhou-ippm-enhanced-alternate-marking-07
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Date: Mon, 25 Oct 2021 03:24:56 +0000
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Subject: Re: [ippm] Enhanced Alternate Marking draft-zhou-ippm-enhanced-alternate-marking-07
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Hi Greg,

Thanks very much for your interest and review comments.
Please see in line with my thoughts.

Cheers,
Tianran

From: Greg Mirsky [mailto:gregimirsky@gmail.com]
Sent: Monday, October 25, 2021 10:25 AM
To: Tianran Zhou <zhoutianran@huawei.com>
Cc: IETF IPPM WG (ippm@ietf.org) <ippm@ietf.org>
Subject: Re: [ippm] Enhanced Alternate Marking draft-zhou-ippm-enhanced-alternate-marking-07

Hi Tianran,
thank you for bringing up this work. I've read the draft and have several comments, questions. Please kindly find those below:
·  Based on the comments during the IESG review of draft-ietf-6man-ipv6-alt-mark, I see a value in extending FlowMonID. That might reduce the probability of a collision.
ZTR> Thanks. I appreciate you agree with the value on this.
·  What could be the use case for the Flow direction identification flag? As the AltMark is applied to the data traffic, wouldn't it always be in the forward direction?
ZTR> Copied from my reply to Haoyu,  I will add more details in the next version. In brief, the “flow direction” is used to address the requirement on setup backward direction flow monitoring automatically. Alt-MK applied to one direction only before. This flag is used to indicate the need to set up.
·  I'm also not clear about the use of the Measurement mode flag. I thought that the mode, hbh or e2e, is determined by the choice of appropriate IPv6 EH - Hop-by-Hop Option Header or Destination Option Header, accordingly. Am I missing something here?
ZTR> Your perspective is correct. This idea is based on our practice on existing network. There were discussions in 6MAN or so, about the EH processing capability.
·  Reading the draft, it was not clear how the extended header helps to lower marking intervals increasing the density of measurements.
ZTR> I will add more info later. Our idea is to add a timestamp taken from the head node, as the meta data. In this way, the intermediate node can always compare with this timestamp to check the delay. So not depend on the delay bit.
Regards,
Greg

On Thu, Oct 21, 2021 at 11:27 PM Tianran Zhou <zhoutianran@huawei.com<mailto:zhoutianran@huawei.com>> wrote:
Hi WG,

There are many interests in this working group working on the alternate marking, RFC8321 and RFC8889.
As you may have seen, we applied this method in IPv6, and the draft is in IESG review.
https://datatracker.ietf.org/doc/draft-ietf-6man-ipv6-alt-mark/

Based on the above draft, and the comments/suggestions we received, we produced an Enhanced Alternate Marking Method.
https://datatracker.ietf.org/doc/draft-zhou-ippm-enhanced-alternate-marking/

This document extends the IPv6 Alternate Marking Option,  to provide the enhanced capabilities and allow advanced functionalities.

We hope you like this idea.
Any comments are welcome.

Thanks,
Tianran
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