RPL Observations
draft-ietf-roll-rpl-observations-04
ROLL R. Jadhav, Ed.
Internet-Draft R. Sahoo
Intended status: Standards Track Y. Wu
Expires: November 22, 2020 Huawei
May 21, 2020
RPL Observations
draft-ietf-roll-rpl-observations-04
Abstract
This document describes RPL protocol design issues, various
observations and possible consequences of the design and
implementation choices.
Status of This Memo
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This Internet-Draft will expire on November 22, 2020.
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Jadhav, et al. Expires November 22, 2020 [Page 1]
Internet-Draft RPL Observations May 2020
Table of Contents
1. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Requirements Language and Terminology . . . . . . . . . . 3
3. DTSN increment in storing MOP . . . . . . . . . . . . . . . . 4
3.1. Deliberations . . . . . . . . . . . . . . . . . . . . . . 5
4. DAO retransmission and use of DAO-ACK in storing MOP . . . . 5
4.1. Significance of bidirectional Path establishment
indication and relevance of DAO-ACK . . . . . . . . . . . 6
4.2. Problems with hop-by-hop DAO-ACK . . . . . . . . . . . . 6
4.3. Problems with end-to-end DAO-ACK . . . . . . . . . . . . 6
4.4. Deliberations . . . . . . . . . . . . . . . . . . . . . . 6
4.5. Implementation Notes . . . . . . . . . . . . . . . . . . 7
5. Interpreting Trickle Timer . . . . . . . . . . . . . . . . . 7
6. Handling resource unavailability . . . . . . . . . . . . . . 8
6.1. Deliberations . . . . . . . . . . . . . . . . . . . . . . 8
7. Handling aggregated targets . . . . . . . . . . . . . . . . . 9
7.1. Deliberations . . . . . . . . . . . . . . . . . . . . . . 9
8. RPL Transit Information in DAO . . . . . . . . . . . . . . . 9
8.1. Deliberations . . . . . . . . . . . . . . . . . . . . . . 10
9. Upgrades or Extensions to RPL protocol . . . . . . . . . . . 10
10. Path Control bits handling . . . . . . . . . . . . . . . . . 10
11. Asymmetric Links and RPL . . . . . . . . . . . . . . . . . . 11
12. Adjacencies probing with RPL . . . . . . . . . . . . . . . . 11
12.1. Deliberations . . . . . . . . . . . . . . . . . . . . . 12
13. Control Options eliding mechanism in RPL . . . . . . . . . . 12
14. Managing persistent variables across node reboots . . . . . . 12
14.1. Persistent storage and RPL state information . . . . . . 12
14.2. Lollipop Counters . . . . . . . . . . . . . . . . . . . 13
14.3. RPL State variables . . . . . . . . . . . . . . . . . . 14
14.3.1. DODAG Version . . . . . . . . . . . . . . . . . . . 14
14.3.2. DTSN field in DIO . . . . . . . . . . . . . . . . . 14
14.3.3. PathSequence . . . . . . . . . . . . . . . . . . . . 15
14.4. State variables update frequency . . . . . . . . . . . . 15
14.5. Deliberations . . . . . . . . . . . . . . . . . . . . . 15
14.6. Implementation Notes . . . . . . . . . . . . . . . . . . 16
15. Capabilities and its role in RPL . . . . . . . . . . . . . . 16
15.1. Handshaking node capabilities . . . . . . . . . . . . . 16
15.2. How do Capabilities differ from MOP and Configuration
Option? . . . . . . . . . . . . . . . . . . . . . . . . 17
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