Hi Dan, Thank you so much for the detailed review and suggestions. I have updated the draft and uploaded a new version. https://datatracker.ietf.org/doc/draft-song-opsawg-ifit-framework/ I'm expecting your continuous support and help to further improve this draft.
Best, Haoyu -----Original Message----- From: OPSAWG <opsawg-boun...@ietf.org> On Behalf Of dan...@olddog.co.uk Sent: Tuesday, October 08, 2019 12:48 AM To: opsawg@ietf.org Cc: draft-song-opsawg-ifit-framework.auth...@ietf.org Subject: [OPSAWG] Comments for draft-song-opsawg-ifit-framework-05.txt Dear Authors, Please find some comments, thoughts and suggestions for https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools.ietf.org%2Fhtml%2Fdraft-song-opsawg-ifit-framework-05&data=02%7C01%7Chaoyu.song%40futurewei.com%7Cf4f7a57161ce480043f008d74bc3e46c%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637061177051023095&sdata=zQGoZucgrTGuHKS0M2H5bUF%2F%2Fqr6kbN%2B9h0ZnQWtKwk%3D&reserved=0 Overall, a really useful document and something I hope the WG can progress. There are many in-band/in-situ OAM documents currently floating around in at least four IETF WGs, so a document that helps coordinate the discussion would be very valuable. General Comments (1) Abstract - The scope is clear, but the intention of this document could be clarified. You might rephrase as: >> For efficient network operation, most operators rely on traditional Operation, Administration and Maintenance (OAM) methods, which include proactive and reactive techniques, running in active and passive modes. As networks increase in scale they become more susceptible to hardware and software failures, and misconfiguration errors. With the advent of programmable data-plane emerging "on-path" OAM techniques, such as flow telemetry, provide unprecedented insight and fast notification of network issues (e.g., jitter, increased latency, packet loss, significant bit error variations, and unequal load-balancing. In-situ Flow Information Telemetry (iFIT), would provide a method for efficiently applying underlying on-path flow telemetry techniques, applicable across various network environments. This document outlines an iFIT framework, which enumerates several critical functional components and describes how these components are assembled together to achieve a complete and closed-loop working solution for on-path flow telemetry. << (2) Use of "Application-aware network" - We may need to be careful with this the usage of this word. It already has a well-used meaning in the context of Cloud and SDN. If you are happy with the general description, we could continue to use "application-aware networking", but we should add a definition, such as: >> Future networks must also support application-aware networking. Application-aware networking is an emerging industry term and typically used to describe the capacity of an intelligent network to maintain current information about user and application connections that use network resources and, as a result, the operator is able to optimize the network resource usage and monitoring to ensure application and traffic optimality. << (3) Additional Challenge - Have you considered a model-driven telemetry API from the iFIT framework that could expose network performance to external applications? Maybe something along the lines of: >> o C6: Development of simplified iFIT telemetry primitives and model, including: telemetry data (e.g., nodes, links, ports, paths, flows, timestamps) query primitives. These may be used by an API-based telemetry service for external applications to iFIT, for monitoring end-to-end latency measurement of network paths and application latency calculation via the iFIT framework. << (4) Security - I think this section requires significantly more text as I can think of numerous issues that will need to be considered, or at least highlighting best practices and considerations discussed in other documents. I started working on a much more comprehensive security section, I will send this to the authors directly (or the list if you prefer) over the next few days. (5) Please find the edits, typos, NITs, suggested text in the attached documents: o draft-song-opsawg-ifit-framework-05-review.txt - https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fdanielkinguk%2Fdraft-song-opsawg-ifit-framework%2Fblob%2Fmaster&data=02%7C01%7Chaoyu.song%40futurewei.com%7Cf4f7a57161ce480043f008d74bc3e46c%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637061177051023095&sdata=MKuRxT18X8EY%2BiuQ6y1eiB8G9n4mT1XVkJvvaq3AYME%3D&reserved=0 /draft-song-opsawg-ifit-framework-05-review.txt o draft-song-opsawg-ifit-framework-05-review-diff.html - https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fdanielkinguk%2Fdraft-song-opsawg-ifit-framework%2Fblob%2Fmaster&data=02%7C01%7Chaoyu.song%40futurewei.com%7Cf4f7a57161ce480043f008d74bc3e46c%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C637061177051023095&sdata=MKuRxT18X8EY%2BiuQ6y1eiB8G9n4mT1XVkJvvaq3AYME%3D&reserved=0 /draft-song-opsawg-ifit-framework-05-review-diff.html I hope this helps. BR, Dan. -----Original Message----- From: I-D-Announce <i-d-announce-boun...@ietf.org> On Behalf Of internet-dra...@ietf.org Sent: 26 September 2019 18:29 To: i-d-annou...@ietf.org Subject: I-D Action: draft-song-opsawg-ifit-framework-05.txt A New Internet-Draft is available from the on-line Internet-Drafts directories. Title : In-situ Flow Information Telemetry Framework Authors : Haoyu Song Zhenbin Li Tianran Zhou Fengwei Qin Huanan Chen Jaewhan Jin Jongyoon Shin Filename : draft-song-opsawg-ifit-framework-05.txt Pages : 16 Date : 2019-09-26 Abstract: Unlike the existing active and passive OAM techniques, the emerging on-path flow telemetry techniques provide unmatched visibility into user traffic, showing great application potential not only for today's network OAM but also for future's automatic network operation. Summarizing the current industry practices that addresses the deployment challenges and application requirements, we provide a closed-loop framework, named In-situ Flow Information Telemetry (iFIT), for efficiently applying a family of underlying on-path flow telemetry techniques in various network environments. The framework enumerates several key architectural components and describes how these components are assembled together to achieve a complete and closed-loop working solution for on-path flow telemetry. Following such a framework allows better scalability, fosters application innovations, and promotes both vertical and horizontal interoperability. 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