PAW for TSCH
draft-thubert-paw-for-tisch-00
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PAW P. Thubert, Ed.
Internet-Draft Cisco
Intended status: Informational January 28, 2019
Expires: August 1, 2019
PAW for TSCH
draft-thubert-paw-for-tisch-00
Abstract
This document builds on the 6TiSCH architecture that defines, among
others, mechanisms to establish and maintain deterministic routing
and scheduling in a centralized fashion. The document details
dependencies on DetNet and PCE controller to express topologies and
capabilities, as well as abstract state that the controller must be
able to program into the network devices to enable deterministic
forwarding operations.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in RFC
2119 [RFC2119].
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
working documents as Internet-Drafts. The list of current Internet-
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 August 1, 2019.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
Thubert Expires August 1, 2019 [Page 1]
Internet-Draft paw-4-tisch January 2019
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. 6TiSCH Overview . . . . . . . . . . . . . . . . . . . . . . . 4
3.1. SlotFrames and Priorities . . . . . . . . . . . . . . . . 7
3.2. Schedule Management by a PCE . . . . . . . . . . . . . . 8
3.3. Track Scheduling Protocol . . . . . . . . . . . . . . . . 9
3.4. Track Forwarding . . . . . . . . . . . . . . . . . . . . 10
3.4.1. Transport Mode . . . . . . . . . . . . . . . . . . . 11
3.4.2. Tunnel Mode . . . . . . . . . . . . . . . . . . . . . 12
3.4.3. Tunnel Metadata . . . . . . . . . . . . . . . . . . . 13
3.4.4. OAM . . . . . . . . . . . . . . . . . . . . . . . . . 14
4. Operations of Interest for DetNet and PCE . . . . . . . . . . 14
4.1. Packet Marking and Handling . . . . . . . . . . . . . . . 15
4.1.1. Tagging Packets for Flow Identification . . . . . . . 15
4.1.2. Replication, Retries and Elimination . . . . . . . . 16
4.1.3. Differentiated Services Per-Hop-Behavior . . . . . . 16
4.2. Topology and capabilities . . . . . . . . . . . . . . . . 17
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
6. Security Considerations . . . . . . . . . . . . . . . . . . . 17
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 17
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1. Normative References . . . . . . . . . . . . . . . . . . 18
8.2. Informative References . . . . . . . . . . . . . . . . . 18
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 21
1. Introduction
The emergence of wireless technology has enabled a variety of new
devices to get interconnected, at a very low marginal cost per
device, at any distance ranging from Near Field to interplanetary,
and in circumstances where wiring may not be practical, for instance
on fast-moving or rotating devices.
At the same time, a new breed of Time Sensitive Networks is being
developed to enable traffic that is highly sensitive to jitter, quite
sensitive to latency, and with a high degree of operational
Thubert Expires August 1, 2019 [Page 2]
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