draft-ietf-manet-dlep-lid-extension-04.txt		draft-ietf-manet-dlep-lid-extension-05.txt
	Mobile Ad hoc Networks Working Group R. Taylor		Mobile Ad hoc Networks Working Group R. Taylor
	Internet-Draft Airbus Defence & Space		Internet-Draft Airbus Defence & Space
	Intended status: Standards Track S. Ratliff		Intended status: Standards Track S. Ratliff
	Expires: February 24, 2019 VT iDirect		Expires: January 26, 2020 VT iDirect
	August 23, 2018		July 25, 2019
	DLEP Link Identifier Extension		DLEP Link Identifier Extension
	draft-ietf-manet-dlep-lid-extension-04		draft-ietf-manet-dlep-lid-extension-05
	Abstract		Abstract
	There exists a class of modems that would benefit from supporting the		The Dynamic Link Exchange Protocol (DLEP) [RFC8175] describes a
	Dynamic Link Exchange Protocol (DLEP) [RFC8175] but do not present a		protocol for modems to advertise the status of wireless links between
	single Layer 2 network domain as required by DLEP. Such devices may		reachable destinations to attached routers. The core specification
	be:		of the protocol assumes that every modem in the radio network has an
			attached DLEP router, and requires that the MAC address of the DLEP
	o Modems that maintain a varying link to some upstream backbone		interface on the attached router be used to identify the destination
	network infrastructure, where the ability to announce link state		in the network, for purposes of reporting the state and quality of
	and DLEP metrics is desired, but the concept of a DLEP destination		the link to that destination.
	router for the backbone does not apply. Examples of such devices
	can include LTE modems, IEEE 802.11 stations not in ad-hoc mode,
	and some satellite terminals.
	o Modems that provide Layer 3 wide area network connectivity between
	devices, where remote DLEP destinations do exist, but are not
	directly reachable by MAC address, such as modems that contain
	embedded routing functionality.
	This document introduces an optional extension to the core DLEP
	specification, allowing DLEP to be used between routers and modems
	that operate in this way.
	Note:
	o This document is intended as an extension to the core DLEP		This document describes a DLEP Extension allowing modems that do not
	specification, and readers are expected to be fully conversant		meet the strict requirement above to use DLEP to describe link
	with the operation of core DLEP.		availability and quality to one or more destinations reachable beyond
			a device on the Layer 2 domain.
	Status of This Memo		Status of This Memo
	This Internet-Draft is submitted in full conformance with the		This Internet-Draft is submitted in full conformance with the
	provisions of BCP 78 and BCP 79.		provisions of BCP 78 and BCP 79.
	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 February 24, 2019.		This Internet-Draft will expire on January 26, 2020.
	Copyright Notice		Copyright Notice
	Copyright (c) 2018 IETF Trust and the persons identified as the		Copyright (c) 2019 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		Provisions Relating to IETF Documents
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	carefully, as they describe your rights and restrictions with respect		carefully, as they describe your rights and restrictions with respect
	to this document. Code Components extracted from this document must		to this document. Code Components extracted from this document must
	include Simplified BSD License text as described in Section 4.e of		include Simplified BSD License text as described in Section 4.e of
	the Trust Legal Provisions and are provided without warranty as		the Trust Legal Provisions and are provided without warranty as
	described in the Simplified BSD License.		described in the Simplified BSD License.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
	1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . 3		1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
	2. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 3		1.2. Applicability . . . . . . . . . . . . . . . . . . . . . . 3
	2.1. Identifier Restrictions . . . . . . . . . . . . . . . . . 4		1.3. Requirements . . . . . . . . . . . . . . . . . . . . . . 3
			2. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 4
			2.1. Identifier Restrictions . . . . . . . . . . . . . . . . . 5
	2.2. Negotiation . . . . . . . . . . . . . . . . . . . . . . . 5		2.2. Negotiation . . . . . . . . . . . . . . . . . . . . . . . 5
	3. New Data Items . . . . . . . . . . . . . . . . . . . . . . . 5		3. New Data Items . . . . . . . . . . . . . . . . . . . . . . . 6
	3.1. Link Identifier Length Data Item . . . . . . . . . . . . 5		3.1. Link Identifier Length Data Item . . . . . . . . . . . . 6
	3.2. Link Identifier Data Item . . . . . . . . . . . . . . . . 6		3.2. Link Identifier Data Item . . . . . . . . . . . . . . . . 6
	4. Security Considerations . . . . . . . . . . . . . . . . . . . 6		4. Security Considerations . . . . . . . . . . . . . . . . . . . 7
	5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7		5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
	6. References . . . . . . . . . . . . . . . . . . . . . . . . . 7		6. Normative References . . . . . . . . . . . . . . . . . . . . 7
	6.1. Normative References . . . . . . . . . . . . . . . . . . 7		Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
	6.2. Informative References . . . . . . . . . . . . . . . . . 7
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
	1. Introduction		1. Introduction
	The Dynamic Link Exchange Protocol (DLEP) [RFC8175] describes a		The Dynamic Link Exchange Protocol (DLEP) [RFC8175] describes a
	protocol for modems to advertise the status of wireless links between		protocol for modems to advertise the status of wireless links between
	reachable destinations to attached routers. The core specification		reachable destinations to attached routers. The core specification
	of the protocol assumes that every modem in the radio network has an		of the protocol assumes that every modem in the radio network has an
	attached DLEP router, and requires that the MAC address of the DLEP		attached DLEP router, and requires that the MAC address of the DLEP
	interface on the attached router is used to identify the destination		interface on the attached router be used to identify the destination
	in the network for purposes of reporting the state and quality of the		in the network, for purposes of reporting the state and quality of
	link to that destination.		the link to that destination.
	This document describes a DLEP Extension allowing modems that do not		This document describes a DLEP Extension allowing modems that do not
	meet the strict requirement that DLEP must be implemented on a single		meet the strict requirement above to use DLEP to describe link
	Layer 2 domain to use DLEP to describe link availability and quality		availability and quality to one or more destinations reachable beyond
	to one or more destinations reachable beyond a local or remote device		a device on the Layer 2 domain.
	on the Layer 2 domain. A router can use this knowledge to influence
	any routing or flow-control decisions regarding traffic to this		As with core DLEP, a router can use this knowledge to influence any
			routing or flow-control decisions regarding traffic to this
	destination, understanding that such traffic flows via Layer 3.		destination, understanding that such traffic flows via Layer 3.
	A Layer 3 destination may be an attached DLEP router, in the case of		1.1. Terminology
	a modem that provides Layer 3 wide area network connectivity between
	devices, or a logical destination that describes a set of attached
	subnets, when referring to some upstream backbone network
	infrastructure.
	1.1. Requirements		Local Layer 2 domain: The Layer 2 domain that links the router and
			modem participants of the current DLEP session.
			Layer 3 DLEP Destination: A DLEP Destination that is not directly
			addressable within the local Layer 2 domain, but is reachable via
			a node addressable within the local Layer 2 domain.
			Gateway Node: The last device with a MAC address reachable in the
			local Layer 2 domain on the path from the DLEP router participant,
			towards the Layer 3 DLEP Destination. This device is commonly the
			DLEP peer modem but could be another DLEP Destination in the Layer
			2 domain.
			1.2. Applicability
			This extension was designed primarily to address the following use
			cases:
			1. A radio system that does not operate in Layer 2 bridge mode, but
			instead provides Layer 3 connectivity between destinations, often
			using its own embedded Layer 3 routing function.
			2. A point-to-multipoint tunnel system, such as an SD-WAN
			deployment, where the tunnel provider acts as a modem, having
			knowledge of the characteristics of the underlay network, and
			providing that information as availability and metrics between
			tunnel endpoints in the overlay network.
			3. A modem that provides connectivity to a remote wide-area network
			via a wireless link, but the concept of a Layer 2 reachable
			remote router does not apply. An example of such a modem would
			be an LTE device or 802.11 station that provides variable
			connectivity to the Internet.
			This list of use-cases is not exhaustive, and this extension may well
			be applicable to future, currently unforeseen, use-cases.
			1.3. Requirements
	The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",		The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
	"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this		"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
	document are to be interpreted as described in BCP 14, RFC 2119.		"OPTIONAL" in this document are to be interpreted as described in BCP
			14 [RFC2119] [RFC8174] when, and only when, they appear in all
			capitals, as shown here.
	2. Operation		2. Operation
	To refer to a Layer 3 DLEP Destination, the DLEP session participant		To refer to a Layer 3 DLEP Destination, the DLEP session participant
	adds a Link Identifier Data Item (Section 3.2) to the relevant		adds a Link Identifier Data Item (Section 3.2) to the relevant
	Destination Message, and (as usual) includes a MAC Address Data Item.		Destination Message, and (as usual) includes a MAC Address Data Item.
	When paired with a Link Identifier Data Item, the MAC Address Data		When paired with a Link Identifier Data Item, the MAC Address Data
	Item MUST contain the MAC address of the last reachable node in the		Item MUST contain the MAC address of the Gateway Node.
	Layer 2 domain beyond which the Layer 3 DLEP Destination resides.
	For example, if the over-the-air network is not a single Layer 2
	domain, the MAC Address Data Item might be the address of the LAN-
	side interface of the local modem. Alternatively, when used with
	some kind of backbone infrastructure, the MAC Address Data Item would
	be the address of the last device reachable on the local Layer 2
	domain. However, how such remote destinations are discovered is
	beyond the scope of this specification.
	As only modems are initially aware of Layer 3 DLEP Destinations, Link		As only modems are initially aware of Layer 3 DLEP Destinations, Link
	Identifier Data Items referring to a new link MUST first appear in a		Identifier Data Items referring to a new link MUST first appear in a
	DLEP Destination Up Message from the modem to the router. Once a		DLEP Destination Up Message from the modem to the router. Once a
	link has been identified in this way, Link Identifier Data Items MAY		link has been identified in this way, Link Identifier Data Items may
	be used by either DLEP participant during the lifetime of a DLEP		be used by either DLEP participant during the lifetime of a DLEP
	session. Because of this, a router MUST NOT send a DLEP Destination		session. Because of this, a router MUST NOT send a DLEP Destination
	Announce Message containing a Link Identifier Data Item referring to		Announce Message containing a Link Identifier Data Item referring to
	a link that has not been mentioned in a prior DLEP Destination Up		a link that has not been mentioned in a prior DLEP Destination Up
	Message.		Message. If a modem receives such a message, it MUST terminate the
			session by issuing a Session Termination Message containing a Status
			Data Item with status code set to 131 'Invalid Destination' and
			transition to the Session Termination state.
	Because the MAC Address associated with any DLEP Destination Message		Because the MAC Address associated with any DLEP Destination Message
	containing a Link Identifier Data Item is not the Layer 2 address of		containing a Link Identifier Data Item is not the Layer 2 address of
	the destination, all DLEP Destination Up Messages MUST contain Layer		the final destination, all DLEP Destination Up Messages containing a
	3 information. In the case of modems that provide Layer 3 wide area		Link Identifier Data Item MUST contain Layer 3 information. In the
	network connectivity between devices, this means one or more IPv4 or		case of modems that provide Layer 3 wide area network connectivity
	IPv6 Address Data Items providing the Layer 3 address of the		between devices, this means one or more IPv4 or IPv6 Address Data
	destination. When referring to some upstream backbone network		Items providing the Layer 3 address of the final destination. When
	infrastructure, this means one or more IPv4 or IPv6 Attached Subnet		referring to some upstream backbone network infrastructure, this
	Data Items, for example: '0.0.0.0/0' or '::/0'. This allows the DLEP		means one or more IPv4 or IPv6 Attached Subnet Data Items, for
	peer router to understand the properties of the link to those routes.		example: '0.0.0.0/0' or '::/0'. This allows the DLEP peer router to
			understand the properties of the link to those routes.
	When the DLEP peer router wishes to forward packets to the Layer 3		When the DLEP peer router wishes to route packets to the Layer 3 DLEP
	destination or subnet, the MAC address associated with the link MUST		Destination, the MAC address associated with the Gateway Node MUST be
	be used as the Layer 2 destination of the packet if it wishes to use		used as the Layer 2 destination of the packet, if it wishes to use
	the modem network to forward the packet.		the modem network to forward the packet.
	As most mainstream routers expect to populate their routing		As routers populate their routing information base with the IP
	information base with the IP address of the next router towards a		address of the next hop router towards a destination, implementations
	destination, implementations supporting this extension SHOULD		supporting this extension SHOULD announce at least one valid IPv4 or
	announce one or more valid IPv4 or IPv6 addresses of the last		IPv6 addresses of the Gateway Node, this removes the need for the
	reachable Layer 2 device, i.e. the device with the corresponding MAC		router to use an additional IP address resolution protocol before
	Address.		adding the route to its routing information base.
	If the last reachable Layer 2 device is not the DLEP peer modem, then
	the modem SHOULD announce a DLEP Destination with the required MAC
	Address without including a Link Identifier Data Item.
	2.1. Identifier Restrictions		2.1. Identifier Restrictions
	A Link Identifier is by default 4 octets in length. If a modem		A Link Identifier is by default 4 octets in length. If a modem
	wishes to use a Link Identifier of a different length, it MUST be		wishes to use a Link Identifier of a different length, it MUST be
	announced using the Link Identifier Length Data Item (Section 3.1)		announced using the Link Identifier Length Data Item (Section 3.1)
	contained in the DLEP Session Initialization Response message sent by		contained in the DLEP Session Initialization Response message sent by
	the modem to the router.		the modem to the router.
	During the lifetime of a DLEP session, the length of Link Identifiers		During the lifetime of a DLEP session, the length of Link Identifiers
	MUST remain constant, i.e. the Length field of the Link Identifier		MUST remain constant, i.e. the Length field of the Link Identifier
	Data Item MUST NOT differ between destinations.		Data Item MUST NOT differ between destinations.
	The method for generating Link Identifiers is a modem implementation		The method for generating Link Identifiers is a modem implementation
	matter and out of scope of this document. Routers MUST NOT make any		matter and out of scope of this document. Routers must not make any
	assumptions about the meaning of Link Identifiers, or how Link		assumptions about the meaning of Link Identifiers, or how Link
	Identifiers are generated.		Identifiers are generated.
	Within a single DLEP session, all Link Identifiers MUST be unique per		Within a single DLEP session, all Link Identifiers MUST be unique per
	MAC Address. This means that a Layer 3 DLEP Destination is uniquely		MAC Address. This means that a Layer 3 DLEP Destination is uniquely
	identified by the pair: {MAC Address,Link Identifier}.		identified by the pair: {MAC Address,Link Identifier}.
	Link Identifiers MUST NOT be reused, i.e. a {MAC Address,Link		Link Identifiers MUST NOT be reused, i.e. a {MAC Address,Link
	Identifier} pair that has been used to refer to one DLEP Destination		Identifier} pair that has been used to refer to one Layer 3 DLEP
	MUST NOT be recycled to refer to a different destination within the		Destination MUST NOT be recycled to refer to a different destination
	lifetime of a single DLEP session.		within the lifetime of a single DLEP session.
	2.2. Negotiation		2.2. Negotiation
	To use this extension, as with all DLEP extensions, the extension		To use this extension, as with all DLEP extensions, the extension
	MUST be announced during DLEP session initialization. A router		MUST be announced during DLEP session initialization. A router
	advertises support by including the value 'Link Identifiers' (TBD1),		advertises support by including the value 'Link Identifiers', TBD1
	Section 5, in the Extension Data Item within the Session		(Section 5), in the Extension Data Item within the Session
	Initialization Message. A modem advertises support by including the		Initialization Message. A modem advertises support by including the
	value 'Link Identifiers' (TBD1) in the Extension Data Item within the		value 'Link Identifiers' in the Extension Data Item within the
	Session Initialization Response Message. If both DLEP peers		Session Initialization Response Message. If both DLEP peers
	advertise support for this extension then the Link Identifier Data		advertise support for this extension then Link Identifier Data Items
	Item MAY be used.		can be included in DLEP Messages.
	If a modem requires support for this extension in order to describe		If a modem requires support for this extension in order to describe
	destinations, and the router does not advertise support, then the		destinations, and the router does not advertise support, then the
	modem MUST NOT include a Link Identifier Data Item in any DLEP		modem MUST NOT include a Link Identifier Data Item in any DLEP
	Message. However, the modem SHOULD NOT immediately terminate the		Message. However, the modem SHOULD NOT immediately terminate the
	DLEP session, rather it SHOULD use session-wide DLEP Data Items to		DLEP session, rather it SHOULD use a combination of DLEP Session
	announce general information about all reachable destinations via the		Messages and DLEP Attached Subnet Data Items to provide general
	modem. By doing this, a modem allows a router not supporting this		information.
	extension to at least make a best guess at the state of any reachable
	network. A modem MUST NOT attempt to re-use the MAC Address Data
	Item to perform some kind of sleight-of-hand, assuming that the
	router will notice the DLEP Peer Type of the modem is special in some
	way.
	3. New Data Items		3. New Data Items
	This extension introduces two new DLEP Data Items: the Link		This extension introduces two new DLEP Data Items: the Link
	Identifier Data Item (Section 3.2) used to identify a Layer 3 link at		Identifier Data Item (Section 3.2) used to identify a Layer 3 link at
	or beyond a destination, and the Link Identifier Length Data Item		or beyond a destination, and the Link Identifier Length Data Item
	(Section 3.1) used to announce the length of Link Identifiers at		(Section 3.1) used to announce the length of Link Identifiers at
	session initialization.		session initialization.
	3.1. Link Identifier Length Data Item		3.1. Link Identifier Length Data Item
	The Link Identifier Length Data Item is used by a DLEP modem		The Link Identifier Length Data Item is used by a DLEP modem
	implementation to specify the length of Link Identifier Data Items.		implementation to specify the length of Link Identifier Data Items.
	It MUST be used if the specified length is not the default value of 4		It MUST be used during Session Initialization, contained in a Session
	octets.		Initialization Response Message, if the specified length is not the
			default value of 4 octets.
	The Link Identifier Length Data Item MAY be used during Session
	Initialization, contained in a Session Initialization Response
	Message.
	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
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Data Item Type | Length |		| Data Item Type | Length |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Link Identifier Length |		| Link Identifier Length |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Data Item Type: TBD2, Section 5		Data Item Type: TBD2 (Section 5)
	Length: 2		Length: 2
	Link Identifier Length: The length, in octets, of Link Identifiers		Link Identifier Length: The length, in octets, of Link Identifiers
	used by the DLEP modem for this session.		used by the DLEP modem for this session.
			A Link Identifier Length Data Item that specifies a Link Identifier
			Length of 4 octets (the default) is valid, even if it has no effect.
	3.2. Link Identifier Data Item		3.2. Link Identifier Data Item
	The Link Identifier Data Item MAY be used wherever a MAC Address Data		The Link Identifier Data Item MAY be used wherever a MAC Address Data
	Item is defined as usable in core DLEP.		Item is defined as usable in core DLEP.
	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
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Data Item Type | Length |		| Data Item Type | Length |
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	| Link Identifier... :		| Link Identifier... :
	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+		+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	Data Item Type: TBD3, Section 5		Data Item Type: TBD3 (Section 5)
	Length: The length of the Data Item, by default 4, but may be		Length: The length of the Data Item, by default 4, but may be
	different if a Link Identifier Length Data Item (Section 3.1) has		different if a Link Identifier Length Data Item (Section 3.1) has
	been announced during session initialization.		been announced during session initialization.
	Link Identifier: The unique identifier of the Layer 3 destination.		Link Identifier: The unique identifier of the Layer 3 DLEP
	This Link Identifier has no implicit meaning and is only used to		Destination. This Link Identifier has no implicit meaning and is
	discriminate between multiple links.		only used to discriminate between multiple links.
	4. Security Considerations		4. Security Considerations
	As an extension to the core DLEP protocol, the security		As an extension to the core DLEP protocol, the security
	considerations of that protocol apply to this extension. This		considerations of that protocol apply to this extension. This
	extension adds no additional security mechanisms or features.		extension adds no additional security mechanisms or features.
	None of the features introduced by this extension require extra		None of the features introduced by this extension require extra
	consideration by an implementation.		consideration by an implementation.
	skipping to change at page 7, line 19 ¶		skipping to change at page 7, line 35 ¶
	o Assign a new DLEP Extensions Registry value (TBD1) from the		o Assign a new DLEP Extensions Registry value (TBD1) from the
	Specification Required section, named "Link Identifiers".		Specification Required section, named "Link Identifiers".
	o Assign a new DLEP Data Item Type Values Registry value (TBD2) from		o Assign a new DLEP Data Item Type Values Registry value (TBD2) from
	the Specification Required section, named "Link Identifier		the Specification Required section, named "Link Identifier
	Length".		Length".
	o Assign a new DLEP Data Item Type Values Registry value (TBD3) from		o Assign a new DLEP Data Item Type Values Registry value (TBD3) from
	the Specification Required section, named "Link Identifier".		the Specification Required section, named "Link Identifier".
	6. References		6. Normative References
	6.1. Normative References
	[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate		[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
	Requirement Levels", BCP 14, RFC 2119,		Requirement Levels", BCP 14, RFC 2119,
	DOI 10.17487/RFC2119, March 1997,		DOI 10.17487/RFC2119, March 1997,
	<https://www.rfc-editor.org/info/rfc2119>.		<https://www.rfc-editor.org/info/rfc2119>.
			[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
			2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
			May 2017, <https://www.rfc-editor.org/info/rfc8174>.
	[RFC8175] Ratliff, S., Jury, S., Satterwhite, D., Taylor, R., and B.		[RFC8175] Ratliff, S., Jury, S., Satterwhite, D., Taylor, R., and B.
	Berry, "Dynamic Link Exchange Protocol (DLEP)", RFC 8175,		Berry, "Dynamic Link Exchange Protocol (DLEP)", RFC 8175,
	DOI 10.17487/RFC8175, June 2017,		DOI 10.17487/RFC8175, June 2017,
	<https://www.rfc-editor.org/info/rfc8175>.		<https://www.rfc-editor.org/info/rfc8175>.
	6.2. Informative References
	[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an
	IANA Considerations Section in RFCs", RFC 5226,
	DOI 10.17487/RFC5226, May 2008,
	<https://www.rfc-editor.org/info/rfc5226>.
	Authors' Addresses		Authors' Addresses
	Rick Taylor		Rick Taylor
	Airbus Defence & Space		Airbus Defence & Space
	Quadrant House		Quadrant House
	Celtic Springs		Celtic Springs
	Coedkernew		Coedkernew
	Newport NP10 8FZ		Newport NP10 8FZ
	UK		UK
End of changes. 35 change blocks.
	127 lines changed or deleted		131 lines changed or added
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