Re: [ippm] FW: New Version Notification for draft-song-ippm-postcard-based-telemetry-11.txt

[Haoyu Song <[e-mail]>]

Hi Gyan,

Thank you for the support.
Indeed, the marking-based PBT provides a method for "zero" overhead on-path telemetry. The method has been adopted for SRv6 OAM. Now in the MPLS extension discussion in the MPLS ODT, we also see a strong interest on it, as you described below. I  believe the adoption could be helpful to formalize the method. I look forward your contribution to continue improve the work!

Best regards,
Haoyu

From: Gyan Mishra <[e-mail]>
Sent: Saturday, April 30, 2022 12:20 PM
To: Haoyu Song <[e-mail]>
Cc: IETF IPPM WG ([e-mail]) <[e-mail]>; IPPM Chairs <[e-mail]>
Subject: Re: [ippm] FW: New Version Notification for draft-song-ippm-postcard-based-telemetry-11.txt


Dear IPPM WG

I have reviewed the draft and as the draft has matured throughout its updates I believe is ready for adoption.

The draft provides an important optimization to postcard based telemetry where in-situ on path IOAM data is not carried in the user data packets and carried separately as postcards sent to the collector.

IOAM DEX Optimization

https://datatracker.ietf.org/doc/draft-ietf-ippm-ioam-direct-export/<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fdraft-ietf-ippm-ioam-direct-export%2F&data=05%7C01%7Chaoyu.song%40futurewei.com%7C42537b2105134d196aed08da2ade6186%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637869431869988031%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=8TzLpHRrDPDd9vp9nOrFK4UF7qIIztOXi9wczrHZjxA%3D&reserved=0>

The MPLS DT has been investigating extensibility of the MPLS data plane to using SPL labels for IOAM trace  capabilities which has significant importance  for gathering telemetry data for operators.

The challenge has been to continue to support existing MPLS architecture, backwards compatibility as well as not excessively increase the depth of the MPLS label stack with a variety of functional SPL labels snd NAI indicators similar in concept to the MPLS Entropy label ELI, EL added to the label stack, as well as the MPLS extension headers being ISD ( In Stack) or PSD (Post Stack).

A new draft was published recently by Robert Raszuk related to reference augmentation forwarding.

https://datatracker.ietf.org/doc/html/draft-raszuk-mpls-raf-fwk-00<https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fdoc%2Fhtml%2Fdraft-raszuk-mpls-raf-fwk-00&data=05%7C01%7Chaoyu.song%40futurewei.com%7C42537b2105134d196aed08da2ade6186%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C0%7C637869431869988031%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=QqRpv%2BCZcrPpAcT018FzMg4XYPftT2StV24mB6Luj9k%3D&reserved=0>

This draft keeps the ISD and PSD stack depth in check by using an alternative means of carrying the IOAM data using IGP  control plane extension TLV to carry the data to provide In-Situ IOAM on path telemetry using IOAM DEX Postcard based telemetry.

This draft provides a critical optimization that fills the gaps with IOAM DEX related to packet marking triggers using existing mechanisms as well as flow path discovery mechanisms to avoid configuration of on path data plane node complexity.

The MPLS DT may come up with other alternatives to carry IOAM data such as the IGP extension mentioned and maybe other solutions, and will heavily rely on the IOAM DEX Postcard based solution.

The optimizations described herein in this draft are that much more important for the realization for operators of a postcard based IOAM on path telemetry solution.

Thank you

Gyan

On Mon, Nov 15, 2021 at 4:31 PM Haoyu Song <[e-mail]<mailto:[e-mail]>> wrote:
Hi IPPM WG and chairs,

According to Tommy's suggestion in the meeting, we acknowledge that our approach is in the same vein of the high level IOAM scheme and complementary with the two other approaches which are currently on the standard track. In this newly submitted revision, we rename the approach as IOAM Marking, making it a member of the family of IOAM telemetry technique. Please review the draft and we request the WG consider to adopt it as well. Any questions and suggestions are welcome. Thanks!

Best regards,
Haoyu

-----Original Message-----
From: [e-mail]<mailto:[e-mail]> <[e-mail]<mailto:[e-mail]>>
Sent: Monday, November 15, 2021 1:20 PM
To: Ahmed Abdelsalam <[e-mail]<mailto:[e-mail]>>; Clarence Filsfils <[e-mail]<mailto:[e-mail]>>; Greg Mirsky <[e-mail]<mailto:[e-mail]>>; Haoyu Song <[e-mail]<mailto:[e-mail]>>; Jongyoon Shin <[e-mail]<mailto:[e-mail]>>; Kyungtae Lee <[e-mail]<mailto:[e-mail]>>; Tianran Zhou <[e-mail]<mailto:[e-mail]>>; Zhenbin Li <[e-mail]<mailto:[e-mail]>>
Subject: New Version Notification for draft-song-ippm-postcard-based-telemetry-11.txt


A new version of I-D, draft-song-ippm-postcard-based-telemetry-11.txt
has been successfully submitted by Haoyu Song and posted to the IETF repository.

Name:           draft-song-ippm-postcard-based-telemetry
Revision:       11
Title:          In-Situ OAM Marking-based Direct Export
Document date:  2021-11-15
Group:          Individual Submission
Pages:          12
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Abstract:
   The document describes a packet-marking variation of the IOAM DEX
   option, referred to as IOAM Marking.  Similar to IOAM DEX, IOAM
   Marking does not carry the telemetry data in user packets but send
   the telemetry data through a dedicated packet.  Unlike IOAM DEX, IOAM
   Marking does not require an extra instruction header.  IOAM Marking
   raises some unique issues that need to be considered.  This document
   formally describes the high level scheme and cover the common
   requirements and issues when applying IOAM Marking in different
   networks.  IOAM Marking is complementary to the other on-path
   telemetry schemes such as IOAM trace and E2E options.




The IETF Secretariat


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Gyan Mishra

Network Solutions Architect

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