draft-ietf-roll-turnon-rfc8138-16.txt   draft-ietf-roll-turnon-rfc8138-17.txt 
ROLL P. Thubert, Ed. ROLL P. Thubert, Ed.
Internet-Draft L. Zhao Internet-Draft L. Zhao
Updates: 8138 (if approved) Cisco Systems Updates: 8138 (if approved) Cisco Systems
Intended status: Standards Track 24 September 2020 Intended status: Standards Track 30 September 2020
Expires: 28 March 2021 Expires: 3 April 2021
A RPL DODAG Configuration Option for the 6LoWPAN Routing Header A RPL DODAG Configuration Option for the 6LoWPAN Routing Header
draft-ietf-roll-turnon-rfc8138-16 draft-ietf-roll-turnon-rfc8138-17
Abstract Abstract
This document updates RFC 8138 by defining a bit in the RPL DODAG This document updates RFC 8138 by defining a bit in the RPL DODAG
Configuration Option to indicate whether compression is used within Configuration Option to indicate whether compression is used within
the RPL Instance, and specify the behavior of RFC 8138-capable nodes the RPL Instance, and specify the behavior of RFC 8138-capable nodes
when the bit is set and unset. when the bit is set and unset.
Status of This Memo Status of This Memo
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on 28 March 2021. This Internet-Draft will expire on 3 April 2021.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents (https://trustee.ietf.org/ Provisions Relating to IETF Documents (https://trustee.ietf.org/
license-info) in effect on the date of publication of this document. license-info) in effect on the date of publication of this document.
Please review these documents carefully, as they describe your rights Please review these documents carefully, as they describe your rights
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information affecting the construction and maintenance of the DODAG, information affecting the construction and maintenance of the DODAG,
as well as operational parameters for RPL on the DODAG, through the as well as operational parameters for RPL on the DODAG, through the
DODAG. As shown in Figure 1, the Option was originally designed with DODAG. As shown in Figure 1, the Option was originally designed with
4 bit positions reserved for future use as Flags. 4 bit positions reserved for future use as Flags.
0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type = 0x04 |Opt Length = 14| | |T| |A| ... | | Type = 0x04 |Opt Length = 14| | |T| |A| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
<- Flags ->
Figure 1: DODAG Configuration Option (Partial View) Figure 1: DODAG Configuration Option (Partial View)
This specification defines a new flag "Enable RFC8138 Compression" This specification defines a new flag "Enable RFC8138 Compression"
(T). The "T" flag is set to turn-on the use of [RFC8138] within the (T). The "T" flag is set to turn-on the use of [RFC8138] within the
DODAG. The "T" flag is encoded in position 2 of the reserved Flags DODAG. The "T" flag is encoded in position 2 of the reserved Flags
in the DODAG Configuration Option (counting from bit 0 as the most in the DODAG Configuration Option (counting from bit 0 as the most
significant bit) and set to 0 in legacy implementations as specified significant bit) and set to 0 in legacy implementations as specified
respectively in Sections 20.14 and 6.7.6 of [RFC6550]. respectively in Sections 20.14 and 6.7.6 of [RFC6550].
Section 4.3 of [USEofRPLinfo] updates [RFC6550] to indicate that the Section 4.3 of [USEofRPLinfo] updates [RFC6550] to indicate that the
definition of the Flags applies to Mode of Operation (MOP) values definition of the Flags applies to Mode of Operation (MOP) values
zero (0) to six (6) only, leaving the flags reserved for MOP value zero (0) to six (6) only. For a MOP value of 7, [RFC8138] MUST be
seven (7). For a MOP value of 7, the bit in position 2 is considered used on Links where 6LoWPAN Header Compression [RFC6282] applies and
unallocated and [RFC8138] MUST be used on Links where 6LoWPAN Header MUST NOT be used otherwise.
Compression [RFC6282] applies and MUST NOT be used otherwise.
The RPL DODAG Configuration Option is typically placed in a DODAG The RPL DODAG Configuration Option is typically placed in a DODAG
Information Object (DIO) message. The DIO message propagates down Information Object (DIO) message. The DIO message propagates down
the DODAG to form and then maintain its structure. The DODAG the DODAG to form and then maintain its structure. The DODAG
Configuration Option is copied unmodified from parents to children. Configuration Option is copied unmodified from parents to children.
[RFC6550] states that "Nodes other than the DODAG Root MUST NOT [RFC6550] states that "Nodes other than the DODAG Root MUST NOT
modify this information when propagating the DODAG Configuration modify this information when propagating the DODAG Configuration
option". Therefore, a legacy parent propagates the "T" flag as set option". Therefore, a legacy parent propagates the "T" flag as set
by the Root, and when the "T" flag is set, it is transparently by the Root, and when the "T" flag is set, it is transparently
flooded to all the nodes in the DODAG. flooded to all the nodes in the DODAG.
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flag unset before allowing nodes that do not support the compression flag unset before allowing nodes that do not support the compression
in the network. To that effect, whether the compression is active in in the network. To that effect, whether the compression is active in
a node SHOULD be exposed the node's management interface. a node SHOULD be exposed the node's management interface.
Nodes that do not support [RFC8138] SHOULD NOT be deployed in a Nodes that do not support [RFC8138] SHOULD NOT be deployed in a
network where the compression is turned on. If that is done, the network where the compression is turned on. If that is done, the
node can only operate as a RUL. node can only operate as a RUL.
6. IANA Considerations 6. IANA Considerations
IANA is requested to assign a new option flag from the Registry for This specification updates the Registry that was created for
the "DODAG Configuration Option Flags" that was created for [RFC6550] [RFC6550] as the registry for "DODAG Configuration Option Flags" and
as follows: updated as the registry for "DODAG Configuration Option Flags for MOP
0..6" by [USEofRPLinfo], by allocating one new Flag as follows:
+---------------+---------------------------------+-----------+ +---------------+---------------------------------+-----------+
| Bit Number | Capability Description | Reference | | Bit Number | Capability Description | Reference |
+---------------+---------------------------------+-----------+ +---------------+---------------------------------+-----------+
| 2 (suggested) | Turn on RFC8138 Compression (T) | THIS RFC | | 2 (suggested) | Turn on RFC8138 Compression (T) | THIS RFC |
+---------------+---------------------------------+-----------+ +---------------+---------------------------------+-----------+
Table 1: New DODAG Configuration Option Flag Table 1: New DODAG Configuration Option Flag
7. Security Considerations 7. Security Considerations
 End of changes. 6 change blocks. 
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