Dear Authors,
Please find some comments, thoughts and suggestions for
https://tools.ietf.org/html/draft-song-opsawg-ifit-framework-05
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://github.com/danielkinguk/draft-song-opsawg-ifit-framework/blob/master
/draft-song-opsawg-ifit-framework-05-review.txt
o draft-song-opsawg-ifit-framework-05-review-diff.html -
https://github.com/danielkinguk/draft-song-opsawg-ifit-framework/blob/master
/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.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-song-opsawg-ifit-framework/
There are also htmlized versions available at:
https://tools.ietf.org/html/draft-song-opsawg-ifit-framework-05
https://datatracker.ietf.org/doc/html/draft-song-opsawg-ifit-framework-05
A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-song-opsawg-ifit-framework-05
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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