Path Aware Networking: Obstacles to Deployment (A Bestiary of Roads Not Taken)
draft-irtf-panrg-what-not-to-do-17
PANRG S. Dawkins, Ed.
Internet-Draft Tencent America
Intended status: Informational 10 February 2021
Expires: 14 August 2021
Path Aware Networking: Obstacles to Deployment (A Bestiary of Roads Not
Taken)
draft-irtf-panrg-what-not-to-do-17
Abstract
At the first meeting of the Path Aware Networking Research Group, the
research group agreed to catalog and analyze past efforts to develop
and deploy Path Aware techniques, most of which were unsuccessful or
at most partially successful, in order to extract insights and
lessons for path-aware networking researchers.
This document contains that catalog and analysis.
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This Internet-Draft will expire on 14 August 2021.
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Table of Contents
1. Introduction
1.1. What Do "Path" and "Path Awareness" Mean in this Document?
2. A Perspective On This Document
2.1. Notes for the Reader
2.2. A Note About Path-Aware Techniques Included In This
Document
2.3. Venue for Discussion of this Document
2.4. Architectural Guidance
2.5. Terminology Used in this Document
2.6. Methodology for Contributions
3. Applying the Lessons We've Learned
4. Summary of Lessons Learned
4.1. Justifying Deployment
4.2. Providing Benefits for Early Adopters
4.3. Providing Benefits During Partial Deployment
4.4. Outperforming End-to-end Protocol Mechanisms
4.5. Paying for Path Aware Techniques
4.6. Impact on Operational Practices
4.7. Per-connection State
4.8. Keeping Traffic on Fast-paths
4.9. Endpoints Trusting Intermediate Nodes
4.10. Intermediate Nodes Trusting Endpoints
4.11. Reacting to Distant Signals
4.12. Support in Endpoint Protocol Stacks
5. Future Work
6. Contributions
6.1. Stream Transport (ST, ST2, ST2+)
6.1.1. Reasons for Non-deployment
6.1.2. Lessons Learned.
6.2. Integrated Services (IntServ)
6.2.1. Reasons for Non-deployment
6.2.2. Lessons Learned.
6.3. Quick-Start TCP
6.3.1. Reasons for Non-deployment
6.3.2. Lessons Learned
6.4. ICMP Source Quench
6.4.1. Reasons for Non-deployment
6.4.2. Lessons Learned
6.5. Triggers for Transport (TRIGTRAN)
6.5.1. Reasons for Non-deployment
6.5.2. Lessons Learned.
6.6. Shim6
6.6.1. Reasons for Non-deployment
6.6.2. Lessons Learned
6.6.3. Addendum on MultiPath TCP
6.7. Next Steps in Signaling (NSIS)
6.7.1. Reasons for Non-deployment
6.7.2. Lessons Learned
6.8. IPv6 Flow Label
6.8.1. Reasons for Non-deployment
6.8.2. Lessons Learned
7. Security Considerations
8. IANA Considerations
9. Acknowledgments
10. Informative References
Author's Address
1. Introduction
This document describes the lessons that IETF participants have
learned (and learned the hard way) about Path Aware Networking over a
period of several decades, and provides an analysis of reasons why
various Path Aware Networking techniques have seen limited or no
deployment.
1.1. What Do "Path" and "Path Awareness" Mean in this Document?
One of the first questions reviewers of this document have asked is
"what's the definition of a path, and what's the definition of path
awareness?" That is not an easy question to answer for this
document.
These terms have definitions in other [PANRG] documents, and are
still the subject of some discussion in the research group, as of the
date of this document. But because this document reflects work
performed over several decades, the technologies described in
Section 6 significantly predate the current definitions of "path" and
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