< 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
	skipping to change at page 1, line 34 ¶		skipping to change at page 1, line 34 ¶
	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
	skipping to change at page 4, line 27 ¶		skipping to change at page 4, line 27 ¶
	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.
	skipping to change at page 7, line 7 ¶		skipping to change at page 7, line 7 ¶
	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.
	11 lines changed or deleted		12 lines changed or added
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