RPL Observations
draft-ietf-roll-rpl-observations-02
ROLL R. Jadhav, Ed.
Internet-Draft R. Sahoo
Intended status: Standards Track Y. Wu
Expires: March 23, 2020 Huawei
September 20, 2019
RPL Observations
draft-ietf-roll-rpl-observations-02
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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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on March 23, 2020.
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Jadhav, et al. Expires March 23, 2020 [Page 1]
Internet-Draft RPL Observations September 2019
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. Handling resource unavailability . . . . . . . . . . . . . . 7
5.1. Deliberations . . . . . . . . . . . . . . . . . . . . . . 7
6. Handling aggregated targets . . . . . . . . . . . . . . . . . 7
6.1. Deliberations . . . . . . . . . . . . . . . . . . . . . . 8
7. RPL Transit Information in DAO . . . . . . . . . . . . . . . 8
7.1. Deliberations . . . . . . . . . . . . . . . . . . . . . . 8
8. Upgrades or Extensions to RPL protocol . . . . . . . . . . . 9
9. Asymmetric Links and RPL . . . . . . . . . . . . . . . . . . 9
10. Adjacencies probing with RPL . . . . . . . . . . . . . . . . 9
10.1. Deliberations . . . . . . . . . . . . . . . . . . . . . 10
11. Control Options eliding mechanism in RPL . . . . . . . . . . 10
12. Managing persistent variables across node reboots . . . . . . 10
12.1. Persistent storage and RPL state information . . . . . . 10
12.2. Lollipop Counters . . . . . . . . . . . . . . . . . . . 11
12.3. RPL State variables . . . . . . . . . . . . . . . . . . 12
12.3.1. DODAG Version . . . . . . . . . . . . . . . . . . . 12
12.3.2. DTSN field in DIO . . . . . . . . . . . . . . . . . 12
12.3.3. PathSequence . . . . . . . . . . . . . . . . . . . . 13
12.4. State variables update frequency . . . . . . . . . . . . 13
12.5. Deliberations . . . . . . . . . . . . . . . . . . . . . 13
12.6. Implementation Notes . . . . . . . . . . . . . . . . . . 14
13. Capabilities and its role in RPL . . . . . . . . . . . . . . 14
13.1. Handshaking node capabilities . . . . . . . . . . . . . 14
13.2. How do Capabilities differ from MOP and Configuration
Option? . . . . . . . . . . . . . . . . . . . . . . . . 15
13.3. Deliberations . . . . . . . . . . . . . . . . . . . . . 15
14. RPL under-specification . . . . . . . . . . . . . . . . . . . 15
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