Mode of Operation extension
draft-ietf-roll-mopex-02
ROLL R. Jadhav, Ed.
Internet-Draft Huawei Tech
Intended status: Standards Track P. Thubert
Expires: April 2, 2021 Cisco
M. Richardson
Sandelman Software Works
September 29, 2020
Mode of Operation extension
draft-ietf-roll-mopex-02
Abstract
RPL allows different mode of operations which allows nodes to have a
consensus on the basic primitives that must be supported to join the
network. The MOP field in [RFC6550] is of 3 bits and is fast
depleting. This document extends the MOP for future use.
Status of This Memo
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This Internet-Draft will expire on April 2, 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language and Terminology . . . . . . . . . . 3
2. Requirements for this document . . . . . . . . . . . . . . . 3
3. Extended MOP Control Message Option . . . . . . . . . . . . . 4
3.1. Handling MOPex . . . . . . . . . . . . . . . . . . . . . 4
3.2. Use of values 0-6 in the MOPex option . . . . . . . . . . 4
4. Extending RPL Control Options . . . . . . . . . . . . . . . . 4
5. Implementation Considerations . . . . . . . . . . . . . . . . 6
6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
7.1. Mode of operation: MOPex . . . . . . . . . . . . . . . . 6
7.2. New options: MOPex and Capabilities . . . . . . . . . . . 6
7.3. New Registry for Extended-MOP-value . . . . . . . . . . . 7
7.4. Change in RPL Control Option field . . . . . . . . . . . 7
8. Security Considerations . . . . . . . . . . . . . . . . . . . 7
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
9.1. Normative References . . . . . . . . . . . . . . . . . . 8
9.2. Informative References . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
1. Introduction
RPL [RFC6550] specifies a proactive distance-vector based routing
scheme. The protocol creates a DAG-like structure which operates
with a given "Mode of Operation" (MOP) determining the minimal and
mandatory set of primitives to be supported by all the participating
nodes.
MOP as per [RFC6550] is a 3-bit value carried in DIO messages and is
specific to the RPL Instance. The recipient of the DIO message can
join the specified network as a router only when it can support the
primitives as required by the mode of operation value. For example,
in case of MOP=3 (Storing MOP with multicast support) the nodes can
join the network as routers only when they can handle the DAO
advertisements from the peers and manage routing tables. The 3-bit
value is already exhausted and requires replenishment. This document
introduces a mechanism to extend mode of operation values.
This document further extends the RPL Control Option syntax to handle
generic flags. The primary aim of these flags is to define the
behaviour of a node not supporting the given control type. If a node
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