Guidelines for Adding Congestion Notification to Protocols that Encapsulate IP
draft-ietf-tsvwg-ecn-encap-guidelines-13
Transport Area Working Group B. Briscoe
Internet-Draft Independent
Updates: 3819 (if approved) J. Kaippallimalil
Intended status: Best Current Practice Huawei
Expires: November 21, 2019 P. Thaler
Broadcom Corporation (retired)
May 20, 2019
Guidelines for Adding Congestion Notification to Protocols that
Encapsulate IP
draft-ietf-tsvwg-ecn-encap-guidelines-13
Abstract
The purpose of this document is to guide the design of congestion
notification in any lower layer or tunnelling protocol that
encapsulates IP. The aim is for explicit congestion signals to
propagate consistently from lower layer protocols into IP. Then the
IP internetwork layer can act as a portability layer to carry
congestion notification from non-IP-aware congested nodes up to the
transport layer (L4). Following these guidelines should assure
interworking among IP layer and lower layer congestion notification
mechanisms, whether specified by the IETF or other standards bodies.
This document updates the advice to subnetwork designers about ECN in
RFC 3819.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 21, 2019.
Briscoe, et al. Expires November 21, 2019 [Page 1]
Internet-Draft ECN Encapsulation Guidelines May 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Update to RFC 3819 . . . . . . . . . . . . . . . . . . . 5
1.2. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Modes of Operation . . . . . . . . . . . . . . . . . . . . . 9
3.1. Feed-Forward-and-Up Mode . . . . . . . . . . . . . . . . 9
3.2. Feed-Up-and-Forward Mode . . . . . . . . . . . . . . . . 11
3.3. Feed-Backward Mode . . . . . . . . . . . . . . . . . . . 12
3.4. Null Mode . . . . . . . . . . . . . . . . . . . . . . . . 14
4. Feed-Forward-and-Up Mode: Guidelines for Adding Congestion
Notification . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1. IP-in-IP Tunnels with Shim Headers . . . . . . . . . . . 15
4.2. Wire Protocol Design: Indication of ECN Support . . . . . 16
4.3. Encapsulation Guidelines . . . . . . . . . . . . . . . . 18
4.4. Decapsulation Guidelines . . . . . . . . . . . . . . . . 20
4.5. Sequences of Similar Tunnels or Subnets . . . . . . . . . 22
4.6. Reframing and Congestion Markings . . . . . . . . . . . . 22
5. Feed-Up-and-Forward Mode: Guidelines for Adding Congestion
Notification . . . . . . . . . . . . . . . . . . . . . . . . 23
6. Feed-Backward Mode: Guidelines for Adding Congestion
Notification . . . . . . . . . . . . . . . . . . . . . . . . 24
7. IANA Considerations (to be removed by RFC Editor) . . . . . . 25
8. Security Considerations . . . . . . . . . . . . . . . . . . . 26
9. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . 26
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 27
11. Comments Solicited . . . . . . . . . . . . . . . . . . . . . 27
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 27
12.1. Normative References . . . . . . . . . . . . . . . . . . 27
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