RPL Observations
draft-ietf-roll-rpl-observations-01
ROLL R. Jadhav, Ed.
Internet-Draft R. Sahoo
Intended status: Standards Track Y. Wu
Expires: September 26, 2019 D. Zhang
Huawei
March 25, 2019
RPL Observations
draft-ietf-roll-rpl-observations-01
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 September 26, 2019.
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Copyright (c) 2019 IETF Trust and the persons identified as the
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Jadhav, et al. Expires September 26, 2019 [Page 1]
Internet-Draft RPL Observations March 2019
Table of Contents
1. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Requirements Language and Terminology . . . . . . . . . . 3
3. DTSN increment in storing MOP . . . . . . . . . . . . . . . . 3
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
8.1. Handshaking optional node capabilities . . . . . . . . . 9
9. Asymmetric Links and RPL . . . . . . . . . . . . . . . . . . 9
10. Managing persistent variables across node reboots . . . . . . 10
10.1. Persistent storage and RPL state information . . . . . . 10
10.2. Lollipop Counters . . . . . . . . . . . . . . . . . . . 11
10.3. RPL State variables . . . . . . . . . . . . . . . . . . 12
10.3.1. DODAG Version . . . . . . . . . . . . . . . . . . . 12
10.3.2. DTSN field in DIO . . . . . . . . . . . . . . . . . 12
10.3.3. PathSequence . . . . . . . . . . . . . . . . . . . . 12
10.4. State variables update frequency . . . . . . . . . . . . 13
10.5. Deliberations . . . . . . . . . . . . . . . . . . . . . 13
10.6. Implementation Notes . . . . . . . . . . . . . . . . . . 13
11. RPL under-specification . . . . . . . . . . . . . . . . . . . 14
12. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 14
13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
14. Security Considerations . . . . . . . . . . . . . . . . . . . 14
15. References . . . . . . . . . . . . . . . . . . . . . . . . . 14
15.1. Normative References . . . . . . . . . . . . . . . . . . 14
15.2. Informative References . . . . . . . . . . . . . . . . . 15
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