< draft-ietf-dhc-dhcpv6-yang-22.txt		draft-ietf-dhc-dhcpv6-yang-23.txt >
	DHC Working Group I. Farrer, Ed.		DHC Working Group I. Farrer, Ed.
	Internet-Draft Deutsche Telekom AG		Internet-Draft Deutsche Telekom AG
	Intended status: Standards Track 2 July 2021		Intended status: Standards Track 25 October 2021
	Expires: 3 January 2022		Expires: 28 April 2022
	YANG Data Model for DHCPv6 Configuration		YANG Data Model for DHCPv6 Configuration
	draft-ietf-dhc-dhcpv6-yang-22		draft-ietf-dhc-dhcpv6-yang-23
	Abstract		Abstract
	This document describes YANG data modules for the configuration and		This document describes YANG data modules for the configuration and
	management of DHCPv6 (Dynamic Host Configuration Protocol for IPv6)		management of DHCPv6 (Dynamic Host Configuration Protocol for IPv6
	servers, relays, and clients.		RFC8415) servers, relays, and clients.
	Requirements Language
	The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
	"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
	"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.
	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
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	This Internet-Draft will expire on 3 January 2022.		This Internet-Draft will expire on 28 April 2022.
	Copyright Notice		Copyright Notice
	Copyright (c) 2021 IETF Trust and the persons identified as the		Copyright (c) 2021 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
	and restrictions with respect to this document. Code Components		and restrictions with respect to this document. Code Components
	extracted from this document must include Simplified BSD License text		extracted from this document must include Simplified BSD License text
	as described in Section 4.e of the Trust Legal Provisions and are		as described in Section 4.e of the Trust Legal Provisions and are
	provided without warranty as described in the Simplified BSD License.		provided without warranty as described in the Simplified BSD License.
	Table of Contents		Table of Contents
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3		1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
	1.1. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 3		1.1. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 3
	1.2. Extensibility of the DHCPv6 Server YANG Module . . . . . 4		1.2. Extensibility of the DHCPv6 Server YANG Module . . . . . 3
	1.2.1. DHCPv6 Option Definitions . . . . . . . . . . . . . . 4		1.2.1. DHCPv6 Option Definitions . . . . . . . . . . . . . . 4
	1.3. Terminology . . . . . . . . . . . . . . . . . . . . . . . 6		1.3. Terminology . . . . . . . . . . . . . . . . . . . . . . . 6
	2. DHCPv6 Tree Diagrams . . . . . . . . . . . . . . . . . . . . 6		2. Requirements Language . . . . . . . . . . . . . . . . . . . . 6
	2.1. DHCPv6 Server Tree Diagram . . . . . . . . . . . . . . . 6		3. DHCPv6 Tree Diagrams . . . . . . . . . . . . . . . . . . . . 6
	2.2. DHCPv6 Relay Tree Diagram . . . . . . . . . . . . . . . . 13		3.1. DHCPv6 Server Tree Diagram . . . . . . . . . . . . . . . 6
	2.3. DHCPv6 Client Tree Diagram . . . . . . . . . . . . . . . 16		3.2. DHCPv6 Relay Tree Diagram . . . . . . . . . . . . . . . . 13
	3. DHCPv6 YANG Modules . . . . . . . . . . . . . . . . . . . . . 19		3.3. DHCPv6 Client Tree Diagram . . . . . . . . . . . . . . . 15
	3.1. DHCPv6 Server YANG Module . . . . . . . . . . . . . . . . 19		4. DHCPv6 YANG Modules . . . . . . . . . . . . . . . . . . . . . 20
	3.2. DHCPv6 Relay YANG Module . . . . . . . . . . . . . . . . 39		4.1. DHCPv6 Common YANG Module . . . . . . . . . . . . . . . . 20
	3.3. DHCPv6 Client YANG Module . . . . . . . . . . . . . . . . 49		4.2. DHCPv6 Server YANG Module . . . . . . . . . . . . . . . . 28
	3.4. DHCPv6 Common YANG Module . . . . . . . . . . . . . . . . 63		4.3. DHCPv6 Relay YANG Module . . . . . . . . . . . . . . . . 48
	4. Security Considerations . . . . . . . . . . . . . . . . . . . 71		4.4. DHCPv6 Client YANG Module . . . . . . . . . . . . . . . . 58
	5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 73		5. Security Considerations . . . . . . . . . . . . . . . . . . . 73
	6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 74		6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 74
	7. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 74		7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 75
	8. References . . . . . . . . . . . . . . . . . . . . . . . . . 74		8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 75
	8.1. Normative References . . . . . . . . . . . . . . . . . . 74		9. References . . . . . . . . . . . . . . . . . . . . . . . . . 76
	8.2. Informative References . . . . . . . . . . . . . . . . . 77		9.1. Normative References . . . . . . . . . . . . . . . . . . 76
	Appendix A. Data Tree Examples . . . . . . . . . . . . . . . . . 77		9.2. Informative References . . . . . . . . . . . . . . . . . 78
	A.1. DHCPv6 Server Configuration Example . . . . . . . . . . . 77		Appendix A. Data Tree Examples . . . . . . . . . . . . . . . . . 79
	A.2. DHCPv6 Relay Configuration Example . . . . . . . . . . . 81		A.1. DHCPv6 Server Configuration Examples . . . . . . . . . . 79
	A.3. DHCPv6 Client Configuration Examples . . . . . . . . . . 82		A.2. DHCPv6 Relay Configuration Example . . . . . . . . . . . 83
			A.3. DHCPv6 Client Configuration Example . . . . . . . . . . . 84
	Appendix B. Example of Augmenting Additional DHCPv6 Option		Appendix B. Example of Augmenting Additional DHCPv6 Option
	Definitions . . . . . . . . . . . . . . . . . . . . . . . 85		Definitions . . . . . . . . . . . . . . . . . . . . . . . 87
	Appendix C. Example Vendor Specific Server Configuration		Appendix C. Example Vendor Specific Server Configuration
	Module . . . . . . . . . . . . . . . . . . . . . . . . . 88		Module . . . . . . . . . . . . . . . . . . . . . . . . . 90
	Appendix D. Example definition of class-selector		Appendix D. Example definition of class-selector
	configuration . . . . . . . . . . . . . . . . . . . . . . 95		configuration . . . . . . . . . . . . . . . . . . . . . . 97
	Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 102		Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 104
	1. Introduction		1. Introduction
	DHCPv6 [RFC8415] is widely used for supplying configuration and other		DHCPv6 [RFC8415] is used for supplying configuration and other
	relevant parameters to clients in IPv6 networks. This document		relevant parameters to clients in IPv6 networks. This document
	defines YANG [RFC7950] modules for the configuration and management		defines YANG [RFC7950] modules for the configuration and management
	of DHCPv6 'element' (servers, relays, and clients) using the Network		of DHCPv6 'element' (servers, relays, and clients) using the Network
	Configuration Protocol (NETCONF [RFC6241]) or RESTCONF [RFC8040]		Configuration Protocol (NETCONF [RFC6241]) or RESTCONF [RFC8040]
	protocols.		protocols.
	Separate modules are defined for each element. Additionally, a		Separate modules are defined for each element. Additionally, a
	'common' module contains typedefs and groupings used by all of the		'common' module contains typedefs and groupings used by all of the
	element modules. Appendix A provides XML examples for each of the		element modules. Appendix A provides XML examples for each of the
	element modules and shows their interaction.		element modules and shows their interaction.
	skipping to change at page 6, line 37 ¶		skipping to change at page 6, line 24 ¶
	The reader should be familiar with the YANG data modeling language		The reader should be familiar with the YANG data modeling language
	defined in [RFC7950].		defined in [RFC7950].
	The YANG modules in this document adopt the Network Management		The YANG modules in this document adopt the Network Management
	Datastore Architecture (NMDA) [RFC8342]. The meanings of the symbols		Datastore Architecture (NMDA) [RFC8342]. The meanings of the symbols
	used in tree diagrams are defined in [RFC8340].		used in tree diagrams are defined in [RFC8340].
	The reader should be familiar with DHCPv6 relevant terminology as		The reader should be familiar with DHCPv6 relevant terminology as
	defined in [RFC8415] and other relevant documents.		defined in [RFC8415] and other relevant documents.
	2. DHCPv6 Tree Diagrams		2. Requirements Language
	2.1. DHCPv6 Server Tree Diagram		The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
			"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
			"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.
			3. DHCPv6 Tree Diagrams
			3.1. DHCPv6 Server Tree Diagram
	The tree diagram in Figure 1 provides an overview of the DHCPv6		The tree diagram in Figure 1 provides an overview of the DHCPv6
	server module. The tree also includes the common functions module		server module. The tree also includes the common functions module
	Section 3.4.		Section 4.1.
	module: ietf-dhcpv6-server		module: ietf-dhcpv6-server
	+--rw dhcpv6-server		+--rw dhcpv6-server
	+--rw enabled? boolean		+--rw enabled? boolean
	+--rw server-duid? dhc6:duid		+--rw server-duid? dhc6:duid
	+--rw vendor-config		+--rw vendor-config
	+--rw option-sets		+--rw option-sets
	| +--rw option-set* [option-set-id]		| +--rw option-set* [option-set-id]
	| +--rw option-set-id uint32		| +--rw option-set-id uint32
	| +--rw description? string		| +--rw description? string
	| +--rw preference-option		| +--rw preference-option
	| | +--rw pref-value? uint8		| | +--rw pref-value? uint8
	| +--rw auth-option		| +--rw auth-option
	| | +--rw protocol? uint8		| | +--rw protocol? uint8
	| | +--rw algorithm? uint8		| | +--rw algorithm? uint8
	skipping to change at page 7, line 34 ¶		skipping to change at page 7, line 28 ¶
	| +--rw reconfigure-message-option		| +--rw reconfigure-message-option
	| | +--rw msg-type? uint8		| | +--rw msg-type? uint8
	| +--rw reconfigure-accept-option!		| +--rw reconfigure-accept-option!
	| +--rw info-refresh-time-option		| +--rw info-refresh-time-option
	| | +--rw info-refresh-time? dhc6:timer-seconds32		| | +--rw info-refresh-time? dhc6:timer-seconds32
	| +--rw sol-max-rt-option		| +--rw sol-max-rt-option
	| | +--rw sol-max-rt-value? dhc6:timer-seconds32		| | +--rw sol-max-rt-value? dhc6:timer-seconds32
	| +--rw inf-max-rt-option		| +--rw inf-max-rt-option
	| +--rw inf-max-rt-value? dhc6:timer-seconds32		| +--rw inf-max-rt-value? dhc6:timer-seconds32
	+--rw class-selector		+--rw class-selector
	+--rw network-ranges		+--rw allocation-ranges
	+--rw option-set-id* leafref		+--rw option-set-id* leafref
	+--rw valid-lifetime? dhc6:timer-seconds32		+--rw valid-lifetime? dhc6:timer-seconds32
	+--rw renew-time? dhc6:timer-seconds32		+--rw renew-time? dhc6:timer-seconds32
	+--rw rebind-time? dhc6:timer-seconds32		+--rw rebind-time? dhc6:timer-seconds32
	+--rw preferred-lifetime? dhc6:timer-seconds32		+--rw preferred-lifetime? dhc6:timer-seconds32
	+--rw rapid-commit? boolean		+--rw rapid-commit? boolean
	+--rw network-range* [id]		+--rw allocation-range* [id]
	| +--rw id uint32		| +--rw id uint32
	| +--rw description? string		| +--rw description? string
	| +--rw network-prefix inet:ipv6-prefix		| +--rw network-prefix inet:ipv6-prefix
	| +--rw option-set-id* leafref		| +--rw option-set-id* leafref
	| +--rw valid-lifetime? dhc6:timer-seconds32		| +--rw valid-lifetime? dhc6:timer-seconds32
	| +--rw renew-time? dhc6:timer-seconds32		| +--rw renew-time? dhc6:timer-seconds32
	| +--rw rebind-time? dhc6:timer-seconds32		| +--rw rebind-time? dhc6:timer-seconds32
	| +--rw preferred-lifetime? dhc6:timer-seconds32		| +--rw preferred-lifetime? dhc6:timer-seconds32
	| +--rw rapid-commit? boolean		| +--rw rapid-commit? boolean
	| +--rw address-pools		| +--rw address-pools {na-assignment}?
	| | +--rw address-pool* [pool-id]		| | +--rw address-pool* [pool-id]
	| | +--rw pool-id uint32		| | +--rw pool-id string
	| | +--rw pool-prefix		| | +--rw pool-prefix
	| | | inet:ipv6-prefix		| | | inet:ipv6-prefix
	| | +--rw start-address		| | +--rw start-address
	| | | inet:ipv6-address-no-zone		| | | inet:ipv6-address-no-zone
	| | +--rw end-address		| | +--rw end-address
	| | | inet:ipv6-address-no-zone		| | | inet:ipv6-address-no-zone
	| | +--rw max-address-utilization? dhc6:threshold		| | +--rw max-address-utilization? dhc6:threshold
	| | +--rw option-set-id* leafref		| | +--rw option-set-id* leafref
	| | +--rw valid-lifetime?		| | +--rw valid-lifetime?
	| | | dhc6:timer-seconds32		| | | dhc6:timer-seconds32
	skipping to change at page 9, line 15 ¶		skipping to change at page 9, line 9 ¶
	| | | dhc6:timer-seconds32		| | | dhc6:timer-seconds32
	| | +--ro lease-t1?		| | +--ro lease-t1?
	| | | dhc6:timer-seconds32		| | | dhc6:timer-seconds32
	| | +--ro lease-t2?		| | +--ro lease-t2?
	| | | dhc6:timer-seconds32		| | | dhc6:timer-seconds32
	| | +--ro status		| | +--ro status
	| | +--ro code? uint16		| | +--ro code? uint16
	| | +--ro message? string		| | +--ro message? string
	| +--rw prefix-pools {prefix-delegation}?		| +--rw prefix-pools {prefix-delegation}?
	| +--rw prefix-pool* [pool-id]		| +--rw prefix-pool* [pool-id]
	| +--rw pool-id uint32		| +--rw pool-id string
	| +--rw pool-prefix		| +--rw pool-prefix
	| | inet:ipv6-prefix		| | inet:ipv6-prefix
	| +--rw client-prefix-length uint8		| +--rw client-prefix-length uint8
	| +--rw max-pd-space-utilization? dhc6:threshold		| +--rw max-pd-space-utilization? dhc6:threshold
	| +--rw option-set-id* leafref		| +--rw option-set-id* leafref
	| +--rw valid-lifetime?		| +--rw valid-lifetime?
	| | dhc6:timer-seconds32		| | dhc6:timer-seconds32
	| +--rw renew-time?		| +--rw renew-time?
	| | dhc6:timer-seconds32		| | dhc6:timer-seconds32
	| +--rw rebind-time?		| +--rw rebind-time?
	skipping to change at page 10, line 34 ¶		skipping to change at page 10, line 28 ¶
	+--ro confirm-count? uint32		+--ro confirm-count? uint32
	+--ro renew-count? uint32		+--ro renew-count? uint32
	+--ro rebind-count? uint32		+--ro rebind-count? uint32
	+--ro reply-count? uint32		+--ro reply-count? uint32
	+--ro release-count? uint32		+--ro release-count? uint32
	+--ro decline-count? uint32		+--ro decline-count? uint32
	+--ro reconfigure-count? uint32		+--ro reconfigure-count? uint32
	+--ro information-request-count? uint32		+--ro information-request-count? uint32
	rpcs:		rpcs:
	+---x delete-address-lease		+---x delete-address-lease {na-assignment}?
	| +---w input		| +---w input
	| | +---w lease-address-to-delete leafref		| | +---w lease-address-to-delete leafref
	| +--ro output		| +--ro output
	| +--ro return-message? string		| +--ro return-message? string
	+---x delete-prefix-lease {prefix-delegation}?		+---x delete-prefix-lease {prefix-delegation}?
	+---w input		+---w input
	| +---w lease-prefix-to-delete leafref		| +---w lease-prefix-to-delete leafref
	+--ro output		+--ro output
	+--ro return-message? string		+--ro return-message? string
	notifications:		notifications:
	+---n address-pool-utilization-threshold-exceeded		+---n address-pool-utilization-threshold-exceeded
			| {na-assignment}?
	| +--ro pool-id leafref		| +--ro pool-id leafref
	| +--ro total-pool-addresses uint64		| +--ro total-pool-addresses uint64
	| +--ro max-allocated-addresses uint64		| +--ro max-allocated-addresses uint64
	| +--ro allocated-address-count uint64		| +--ro allocated-address-count uint64
	+---n prefix-pool-utilization-threshold-exceeded		+---n prefix-pool-utilization-threshold-exceeded
	| {prefix-delegation}?		| {prefix-delegation}?
	| +--ro pool-id leafref		| +--ro pool-id leafref
	| +--ro total-pool-prefixes uint64		| +--ro total-pool-prefixes uint64
	| +--ro max-allocated-prefixes uint64		| +--ro max-allocated-prefixes uint64
	| +--ro allocated-prefixes-count uint64		| +--ro allocated-prefixes-count uint64
	+---n invalid-client-detected		+---n invalid-client-detected
	| +--ro message-type? enumeration		| +--ro message-type? enumeration
	| +--ro duid? dhc6:duid		| +--ro duid? dhc6:duid
	| +--ro description? string		| +--ro description? string
	+---n decline-received		+---n decline-received {na-assignment}?
	| +--ro duid? dhc6:duid		| +--ro duid? dhc6:duid
	| +--ro declined-resources* []		| +--ro declined-resources* []
	| +--ro (resource-type)?		| +--ro (resource-type)?
	| +--:(declined-address)		| +--:(declined-address)
	| | +--ro address? inet:ipv6-address		| | +--ro address? inet:ipv6-address
	| +--:(declined-prefix)		| +--:(declined-prefix)
	| +--ro prefix? inet:ipv6-prefix		| +--ro prefix? inet:ipv6-prefix
	+---n non-success-code-sent		+---n non-success-code-sent
	+--ro duid? dhc6:duid		+--ro duid? dhc6:duid
	+--ro status		+--ro status
	skipping to change at page 12, line 23 ¶		skipping to change at page 12, line 17 ¶
	and additional options that are also relevant to the relay and/or		and additional options that are also relevant to the relay and/or
	client are imported from the 'ietf-dhcpv6-common' module. Where		client are imported from the 'ietf-dhcpv6-common' module. Where
	needed, other DHCPv6 option modules can be augmented as they are		needed, other DHCPv6 option modules can be augmented as they are
	defined.		defined.
	* class-selector: This is provided as a location for additional		* class-selector: This is provided as a location for additional
	implementation specific YANG nodes for vendor specific class		implementation specific YANG nodes for vendor specific class
	selector nodes to be augmented. See Appendix D for an example of		selector nodes to be augmented. See Appendix D for an example of
	this.		this.
	* network-ranges: A hierarchical model is used for the allocation of		* allocation-ranges: A hierarchical model is used for the allocation
	addresses and prefixes. At the top level 'network-ranges'		of addresses and prefixes. At the top level 'allocation-ranges'
	container holds global configuration parameters. Under this, the		container holds global configuration parameters. Under this, the
	'network-range' list is used for specifying IPv6 prefixes and		'allocation-range' list is used for specifying IPv6 prefixes and
	additional, prefix specific parameters.		additional, prefix specific parameters.
	* address-pools: Used for IA_NA and IA_TA pool allocations with a		* address-pools: Used for IA_NA and IA_TA pool allocations with a
	container for defining host reservations. State information about		container for defining host reservations. State information about
	active leases from the pool is also located here.		active leases from the pool is also located here.
	* prefix-pools: Defines pools to be used for prefix delegation to		* prefix-pools: Defines pools to be used for prefix delegation to
	clients. Static host reservations can also be configured. As		clients. Static host reservations can also be configured. As
	prefix delegation is not supported by all DHCPv6 server		prefix delegation is not supported by all DHCPv6 server
	implementations, it is enabled by a feature statement.		implementations, it is enabled by a feature statement.
	skipping to change at page 13, line 15 ¶		skipping to change at page 13, line 8 ¶
	* invalid-client-detected: Raised when the server detects an invalid		* invalid-client-detected: Raised when the server detects an invalid
	client. A description of the error and message type that has		client. A description of the error and message type that has
	generated the notification can be included.		generated the notification can be included.
	* decline-received: Raised when a DHCPv6 Decline message is received		* decline-received: Raised when a DHCPv6 Decline message is received
	from a client.		from a client.
	* non-success-code-sent: Raised when there is a status message for		* non-success-code-sent: Raised when there is a status message for
	an failure.		an failure.
	2.2. DHCPv6 Relay Tree Diagram		3.2. DHCPv6 Relay Tree Diagram
	The tree diagram in Figure 2 provides an overview of the DHCPv6 relay		The tree diagram in Figure 2 provides an overview of the DHCPv6 relay
	module. The tree also includes the common functions module		module. The tree also includes the common functions module
	Section 3.4.		Section 4.1.
	module: ietf-dhcpv6-relay		module: ietf-dhcpv6-relay
	+--rw dhcpv6-relay		+--rw dhcpv6-relay
	+--rw enabled? boolean		+--rw enabled? boolean
	+--rw relay-if* [if-name]		+--rw relay-if* [if-name]
	| +--rw if-name		| +--rw if-name
	| | if:interface-ref		| | if:interface-ref
	| +--rw enabled? boolean		| +--rw enabled? boolean
	| +--rw destination-address*		| +--rw destination-address*
	| | inet:ipv6-address		| | inet:ipv6-address
	skipping to change at page 16, line 5 ¶		skipping to change at page 15, line 46 ¶
	the relay.		the relay.
	* clear-interface-prefixes: Allows the removal of all of the		* clear-interface-prefixes: Allows the removal of all of the
	delegated lease entries from an interface on the relay.		delegated lease entries from an interface on the relay.
	Information about notifications:		Information about notifications:
	* topology-changed: Raised when the topology of the relay agent is		* topology-changed: Raised when the topology of the relay agent is
	changed, e.g., a client facing interface is reconfigured.		changed, e.g., a client facing interface is reconfigured.
	2.3. DHCPv6 Client Tree Diagram		3.3. DHCPv6 Client Tree Diagram
	The tree diagram in Figure 3 provides an overview of the DHCPv6		The tree diagram in Figure 3 provides an overview of the DHCPv6
	client module. The tree also includes the common functions module		client module. The tree also includes the common functions module
	defined in Section 3.4.		defined in Section 4.1.
	module: ietf-dhcpv6-client		module: ietf-dhcpv6-client
	+--rw dhcpv6-client		+--rw dhcpv6-client
	+--rw enabled? boolean		+--rw enabled? boolean
			+--rw client-duid? dhc6:duid
			| {non-temp-addr or prefix-del or temp-addr
			| and not anon-profile}?
	+--rw client-if* [if-name]		+--rw client-if* [if-name]
	+--rw if-name if:interface-ref		+--rw if-name if:interface-ref
	+--rw enabled? boolean		+--rw enabled? boolean
	+--rw duid? dhc6:duid		+--rw interface-duid? dhc6:duid
			| {non-temp-addr or prefix-del or temp-addr
			| and anon-profile}?
	+--rw client-configured-options		+--rw client-configured-options
	| +--rw option-request-option		| +--rw option-request-option
	| | +--rw oro-option* uint16		| | +--rw oro-option* uint16
	| +--rw rapid-commit-option!		| +--rw rapid-commit-option!
	| +--rw user-class-option!		| +--rw user-class-option!
	| | +--rw user-class-data-instance*		| | +--rw user-class-data-instance*
	| | [user-class-data-id]		| | [user-class-data-id]
	| | +--rw user-class-data-id uint8		| | +--rw user-class-data-id uint8
	| | +--rw user-class-data? string		| | +--rw user-class-data? string
	| +--rw vendor-class-option		| +--rw vendor-class-option
	skipping to change at page 16, line 43 ¶		skipping to change at page 16, line 42 ¶
	| | +--rw vendor-class-data-id uint8		| | +--rw vendor-class-data-id uint8
	| | +--rw vendor-class-data? string		| | +--rw vendor-class-data? string
	| +--rw vendor-specific-information-options		| +--rw vendor-specific-information-options
	| | +--rw vendor-specific-information-option*		| | +--rw vendor-specific-information-option*
	| | [enterprise-number]		| | [enterprise-number]
	| | +--rw enterprise-number uint32		| | +--rw enterprise-number uint32
	| | +--rw vendor-option-data* [sub-option-code]		| | +--rw vendor-option-data* [sub-option-code]
	| | +--rw sub-option-code uint16		| | +--rw sub-option-code uint16
	| | +--rw sub-option-data? string		| | +--rw sub-option-data? string
	| +--rw reconfigure-accept-option!		| +--rw reconfigure-accept-option!
	+--rw ia-na* [ia-id] {non-temporary-address}?		+--rw ia-na* [ia-id] {non-temp-addr}?
	| +--rw ia-id uint32		| +--rw ia-id uint32
	| +--rw ia-na-options		| +--rw ia-na-options
	| +--ro lease-state		| +--ro lease-state
	| +--ro ia-na-address? inet:ipv6-address		| +--ro ia-na-address? inet:ipv6-address
	| +--ro lease-t1? dhc6:timer-seconds32		| +--ro lease-t1? dhc6:timer-seconds32
	| +--ro lease-t2? dhc6:timer-seconds32		| +--ro lease-t2? dhc6:timer-seconds32
	| +--ro preferred-lifetime? dhc6:timer-seconds32		| +--ro preferred-lifetime? dhc6:timer-seconds32
	| +--ro valid-lifetime? dhc6:timer-seconds32		| +--ro valid-lifetime? dhc6:timer-seconds32
	| +--ro allocation-time? yang:date-and-time		| +--ro allocation-time? yang:date-and-time
	| +--ro last-renew-rebind? yang:date-and-time		| +--ro last-renew-rebind? yang:date-and-time
	| +--ro server-duid? dhc6:duid		| +--ro server-duid? dhc6:duid
	| +--ro status		| +--ro status
	| +--ro code? uint16		| +--ro code? uint16
	| +--ro message? string		| +--ro message? string
	+--rw ia-ta* [ia-id] {temporary-address}?		+--rw ia-ta* [ia-id] {temp-addr}?
	| +--rw ia-id uint32		| +--rw ia-id uint32
	| +--rw ia-ta-options		| +--rw ia-ta-options
	| +--ro lease-state		| +--ro lease-state
	| +--ro ia-ta-address? inet:ipv6-address		| +--ro ia-ta-address? inet:ipv6-address
	| +--ro preferred-lifetime? dhc6:timer-seconds32		| +--ro preferred-lifetime? dhc6:timer-seconds32
	| +--ro valid-lifetime? dhc6:timer-seconds32		| +--ro valid-lifetime? dhc6:timer-seconds32
	| +--ro allocation-time? yang:date-and-time		| +--ro allocation-time? yang:date-and-time
	| +--ro last-renew-rebind? yang:date-and-time		| +--ro last-renew-rebind? yang:date-and-time
	| +--ro server-duid? dhc6:duid		| +--ro server-duid? dhc6:duid
	| +--ro status		| +--ro status
	| +--ro code? uint16		| +--ro code? uint16
	| +--ro message? string		| +--ro message? string
	+--rw ia-pd* [ia-id] {prefix-delegation}?		+--rw ia-pd* [ia-id] {prefix-del}?
	| +--rw ia-id uint32		| +--rw ia-id uint32
			| +--rw prefix-length-hint? uint8
	| +--rw ia-pd-options		| +--rw ia-pd-options
	| +--ro lease-state		| +--ro lease-state
	| +--ro ia-pd-prefix? inet:ipv6-prefix		| +--ro ia-pd-prefix? inet:ipv6-prefix
	| +--ro lease-t1? dhc6:timer-seconds32		| +--ro lease-t1? dhc6:timer-seconds32
	| +--ro lease-t2? dhc6:timer-seconds32		| +--ro lease-t2? dhc6:timer-seconds32
	| +--ro preferred-lifetime? dhc6:timer-seconds32		| +--ro preferred-lifetime? dhc6:timer-seconds32
	| +--ro valid-lifetime? dhc6:timer-seconds32		| +--ro valid-lifetime? dhc6:timer-seconds32
	| +--ro allocation-time? yang:date-and-time		| +--ro allocation-time? yang:date-and-time
	| +--ro last-renew-rebind? yang:date-and-time		| +--ro last-renew-rebind? yang:date-and-time
	| +--ro server-duid? dhc6:duid		| +--ro server-duid? dhc6:duid
	skipping to change at page 17, line 51 ¶		skipping to change at page 17, line 51 ¶
	+--ro renew-count? uint32		+--ro renew-count? uint32
	+--ro rebind-count? uint32		+--ro rebind-count? uint32
	+--ro reply-count? uint32		+--ro reply-count? uint32
	+--ro release-count? uint32		+--ro release-count? uint32
	+--ro decline-count? uint32		+--ro decline-count? uint32
	+--ro reconfigure-count? uint32		+--ro reconfigure-count? uint32
	+--ro information-request-count? uint32		+--ro information-request-count? uint32
	notifications:		notifications:
	+---n invalid-ia-address-detected		+---n invalid-ia-address-detected
	| {non-temporary-address or temporary-address}?		| {non-temp-addr or temp-addr}?
	| +--ro ia-id uint32		| +--ro ia-id uint32
	| +--ro ia-na-t1-timer? uint32		| +--ro ia-na-t1-timer? uint32
	| +--ro ia-na-t2-timer? uint32		| +--ro ia-na-t2-timer? uint32
	| +--ro invalid-address? inet:ipv6-address		| +--ro invalid-address? inet:ipv6-address
	| +--ro preferred-lifetime? uint32		| +--ro preferred-lifetime? uint32
	| +--ro valid-lifetime? uint32		| +--ro valid-lifetime? uint32
	| +--ro ia-options? binary		| +--ro ia-options? binary
	| +--ro description? string		| +--ro description? string
	+---n transmission-failed		+---n transmission-failed
	| +--ro failure-type enumeration		| +--ro failure-type enumeration
	| +--ro description? string		| +--ro description? string
	+---n unsuccessful-status-code		+---n unsuccessful-status-code
	| +--ro server-duid dhc6:duid		| +--ro server-duid dhc6:duid
	| +--ro status		| +--ro status
	| +--ro code? uint16		| +--ro code? uint16
	| +--ro message? string		| +--ro message? string
	+---n server-duid-changed		+---n server-duid-changed
	{non-temporary-address or prefix-delegation or temporary-		{non-temp-addr or prefix-del or temp-addr}?
	address}?
	+--ro new-server-duid dhc6:duid		+--ro new-server-duid dhc6:duid
	+--ro previous-server-duid dhc6:duid		+--ro previous-server-duid dhc6:duid
	+--ro lease-ia-na?		+--ro lease-ia-na?
	| -> ../../dhcpv6-client/client-if/ia-na/ia-id		| -> ../../dhcpv6-client/client-if/ia-na/ia-id
	| {non-temporary-address}?		| {non-temp-addr}?
	+--ro lease-ia-ta?		+--ro lease-ia-ta?
	| -> ../../dhcpv6-client/client-if/ia-ta/ia-id		| -> ../../dhcpv6-client/client-if/ia-ta/ia-id
	| {temporary-address}?		| {temp-addr}?
	+--ro lease-ia-pd?		+--ro lease-ia-pd?
	-> ../../dhcpv6-client/client-if/ia-pd/ia-id		-> ../../dhcpv6-client/client-if/ia-pd/ia-id
	{prefix-delegation}?		{prefix-del}?
	Figure 3: DHCPv6 Client Data Module Structure		Figure 3: DHCPv6 Client Data Module Structure
	Descriptions of important nodes:		Descriptions of important nodes:
	* enabled: Globally enables/disables all DHCPv6 client functions.		* enabled: Globally enables/disables all DHCPv6 client functions.
	* dhcpv6-client: This container holds the client's DHCPv6 specific		* dhcpv6-client: This container holds the client's DHCPv6 specific
	configuration.		configuration.
	* client-if: As a client may have multiple interfaces requesting		* client-if: As a client may have multiple interfaces requesting
	configuration over DHCP, they are configured in a list. The if-		configuration over DHCP, they are configured in a list. The if-
	name leaf is the key and is an interface-ref to the applicable		name leaf is the key and is an interface-ref to the applicable
	interface defined by the 'ietf-interfaces' YANG module.		interface defined by the 'ietf-interfaces' YANG module.
	* enabled: Enables/disables all DHCPv6 client function for the		* enabled: Enables/disables all DHCPv6 client function for the
	specific interface.		specific interface.
	* client-duid: Each client must have a DUID (DHCP Unique Identifier)		* client-duid/interface-duid: The DUID (DHCP Unique Identifier) is
	to identify itself to servers and relays. A DUID consists of a		used to identify the client to servers and relays. DUID
	two-octet type field and an arbitrary length (1-128 octets)		configuration may conditionally appear in one of two locations in
	content field. Currently there are four defined types of DUIDs in		the client tree, depending on the features that the client
	[RFC8415] and [RFC6355]. The DUID may be configured using the		implements. If the client does not support requesting any address
	format for one of these types, or using the 'unstructured' format.		or prefix leasing features, then there is no leaf for a DUID
	The DUID type definitions are imported from the 'ietf-		value. If the client does not implement the 'anon-profile'
	dhcpv6-common.yang' module. [IANA-HARDWARE-TYPES] and [IANA-PEN]		feature [RFC7844], then there is a single 'client-duid' leaf that
	are referenced for the relevant DUID types.		holds that DUID value which will be used for all DHCPv6 enabled
			interfaces. If the 'anon-profile' is enabled, there is an
			'interface-duid' leaf for each DHCP enabled interface. A DUID
			consists of a two-octet type field and an arbitrary length (1-128
			octets) content field. Currently there are four defined types of
			DUIDs in [RFC8415] and [RFC6355]. The DUID may be configured
			using the format for one of these types, or using the
			'unstructured' format. The DUID type definitions are imported
			from the 'ietf-dhcpv6-common.yang' module. [IANA-HARDWARE-TYPES]
			and [IANA-PEN] are referenced for the relevant DUID types.
	* client-configured-options: Holds configuration parameters for		* client-configured-options: Holds configuration parameters for
	DHCPv6 options which can be sent by the client. The initial set		DHCPv6 options which can be sent by the client. The initial set
	of applicable option definitions are defined here and additional		of applicable option definitions are defined here and additional
	options that are also relevant to the relay and/or server are		options that are also relevant to the relay and/or server are
	imported from the 'ietf-dhcpv6-common' module. Where needed,		imported from the 'ietf-dhcpv6-common' module. Where needed,
	other DHCPv6 option modules can be augmented as they are defined.		other DHCPv6 option modules can be augmented as they are defined.
	* ia-na, ia-ta, ia-pd: Contains configuration nodes relevant for		* ia-na, ia-ta, ia-pd: Contains configuration nodes relevant for
	requesting one or more of each of the lease types. Read-only		requesting one or more of each of the lease types. Read-only
	skipping to change at page 19, line 39 ¶		skipping to change at page 20, line 5 ¶
	Information about notifications:		Information about notifications:
	* invalid-ia-detected: Raised when the identity association of the		* invalid-ia-detected: Raised when the identity association of the
	client can be proved to be invalid. Possible conditions include:		client can be proved to be invalid. Possible conditions include:
	duplicated address, illegal address, etc.		duplicated address, illegal address, etc.
	* retransmission-failed: Raised when the retransmission mechanism		* retransmission-failed: Raised when the retransmission mechanism
	defined in [RFC8415] has failed.		defined in [RFC8415] has failed.
	3. DHCPv6 YANG Modules		4. DHCPv6 YANG Modules
	3.1. DHCPv6 Server YANG Module		4.1. DHCPv6 Common YANG Module
			This module imports typedefs from [RFC6991].
			<CODE BEGINS> file "ietf-dhcpv6-common@2021-10-25.yang"
			module ietf-dhcpv6-common {
			yang-version 1.1;
			namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-common";
			prefix "dhc6";
			organization
			"IETF DHC (Dynamic Host Configuration) Working Group";
			contact
			"WG Web: <https://datatracker.ietf.org/wg/dhc/>
			WG List: <mailto:dhcwg@ietf.org>
			Author: Yong Cui <yong@csnet1.cs.tsinghua.edu.cn>
			Author: Linhui Sun <lh.sunlinh@gmail.com>
			Editor: Ian Farrer <ian.farrer@telekom.de>
			Author: Sladjana Zeichlin <sladjana.zechlin@telekom.de>
			Author: Zihao He <hezihao9512@gmail.com>
			Author: Michal Nowikowski <godfryd@isc.org>";
			description
			"This YANG module defines common components used for the
			configuration and management of DHCPv6.
			The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL',
			'SHALL NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED',
			'NOT RECOMMENDED', 'MAY', and 'OPTIONAL' in this document
			are to be interpreted as described in BCP 14 (RFC 2119)
			(RFC 8174) when, and only when, they appear in all
			capitals, as shown here.
			Copyright (c) 2021 IETF Trust and the persons identified as
			authors of the code. All rights reserved.
			Redistribution and use in source and binary forms, with or
			without modification, is permitted pursuant to, and subject
			to the license terms contained in, the Simplified BSD License
			set forth in Section 4.c of the IETF Trust's Legal Provisions
			Relating to IETF Documents
			(https://trustee.ietf.org/license-info).
			This version of this YANG module is part of RFC XXXX; see
			the RFC itself for full legal notices.";
			revision 2021-10-25 {
			description
			"Initial Revision.";
			reference
			"XXXX: YANG Data Model for DHCPv6 Configuration";
			}
			typedef threshold {
			type uint8 {
			range 1..100;
			}
			description
			"Threshold value in percent.";
			}
			typedef timer-seconds32 {
			type uint32;
			units "seconds";
			description
			"Timer value type, in seconds (32-bit range).";
			}
			typedef duid-base {
			type string {
			pattern '([0-9a-fA-F]{2}){3,130}';
			}
			description
			"Each DHCP server and client has a DUID (DHCP Unique
			Identifier). The DUID consists of a two-octet
			type field and an arbitrary length (1-128 octets) content
			field. The duid-base type is used by other duid types with
			additional pattern constraints.
			Currently, there are four defined types of DUIDs
			in RFC 8415 and RFC 6355 - DUID-LLT, DUID-EN, DUID-LL
			and DUID-UUID. DUID-unstructured represents DUIDs which
			do not follow any of the defined formats.";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 11
			RFC 6355: Definition of the UUID-Based DHCPv6 Unique
			Identifier (DUID-UUID), Section 4";
			}
			typedef duid-llt {
			type duid-base {
			pattern '0001'
			+ '[0-9a-fA-F]{12,}';
			}
			description
			"DUID type 1, based on Link-Layer Address Plus Time
			(DUID-LLT). Constructed with a 2-octet hardware type assigned
			by IANA, 4-octet containing the time the DUID is generated
			(represented in seconds since midnight (UTC), January 1, 2000,
			modulo 2^32), and a link-layer address. The address is encoded
			without separator characters. For example:
			+------+------+----------+--------------+
			| 0001 | 0006 | 28490058 | 00005E005300 |
			+------+------+----------+--------------+
			This example includes the 2-octet DUID type of 1 (0x01), the
			hardware type is 0x06 (IEEE Hardware Types) the creation
			time is 0x028490058 (constructed as described above). Finally,
			the link-layer address is 0x5E005300 (EUI-48 address
			00-00-5E-00-53-00)";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 11.2
			IANA 'Hardware Types' registry.
			<https://www.iana.org/assignments/arp-parameters>";
			}
			typedef duid-en {
			type duid-base {
			pattern '0002'
			+ '[0-9a-fA-F]{4,}';
			}
			description
			"DUID type 2, assigned by vendor based on Enterprise
			Number (DUID-EN). This DUID consists of the 4-octet vendor's
			registered Private Enterprise Number as maintained by IANA
			followed by a unique identifier assigned by the vendor. For
			example:
			+------+----------+------------------+
			| 0002 | 00007ED9 | 0CC084D303000912 |
			+------+----------+------------------+
			This example includes the 2-octet DUID type of 2 (0x02),
			4-octets for the Enterprise Number (0x7ED9), followed by
			8-octets of identifier data (0x0CC084D303000912).";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 11.3
			IANA 'Private Enterprise Numbers' registry.
			<https://www.iana.org/assignments/enterprise-numbers>";
			}
			typedef duid-ll {
			type duid-base {
			pattern '0003'
			+ '([0-9a-fA-F]){4,}';
			}
			description
			"DUID type 3, based on Link-Layer Address (DUID-LL).
			Constructed with a 2-octet hardware type assigned
			by IANA, and a link-layer address. The address is encoded
			without separator characters. For example:
			+------+------+--------------+
			| 0003 | 0006 | 00005E005300 |
			+------+------+--------------+
			This example includes the 2-octet DUID type of 3 (0x03), the
			hardware type is 0x06 (IEEE Hardware Types), and the link-layer
			address is 0x5E005300 (EUI-48 address 00-00-5E-00-53-00)";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 11.4
			IANA 'Hardware Types' registry.
			<https://www.iana.org/assignments/arp-parameters>";
			}
			typedef duid-uuid {
			type duid-base {
			pattern '0004'
			+ '[0-9a-fA-F]{32}';
			}
			description
			"DUID type 4, based on Universally Unique Identifier
			(DUID-UUID). This type of DUID consists of 16 octets
			containing a 128-bit UUID. For example:
			+------+----------------------------------+
			| 0004 | 9f03b182705747e38a1e422910078642 |
			+------+----------------------------------+
			This example includes the 2-octet DUID type of 4 (0x04), and
			the UUID 9f03b182-7057-47e3-8a1e-422910078642.";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 11.5
			RFC 6355: Definition of the UUID-Based DHCPv6 Unique Identifier
			(DUID-UUID)";
			}
			typedef duid-unstructured {
			type duid-base {
			pattern '(000[1-4].*|.*[^0-9a-fA-F].*)' {
			modifier invert-match;
			}
			}
			description
			"Used for DUIDs following any other formats than DUID
			types 1-4. For example:
			+----------------------------------+
			| 7b6a164d325946539dc540fb539bc430 |
			+----------------------------------+
			Here, an arbitrary 16-octet value is used. The only constraint
			placed on this is that the first 2-octects are not 0x01-0x04
			to avoid collision with the other defined DUID types
			(duid-llt, duid-en, duid-ll, or duid-uuid).";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 11";
			}
			typedef duid {
			type union {
			type duid-llt;
			type duid-en;
			type duid-ll;
			type duid-uuid;
			type duid-unstructured;
			}
			description
			"Represents the DUID and is neutral to the DUID's construction
			format.";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 11";
			}
			/*
			* Groupings
			*/
			grouping status {
			description
			"Holds information about the most recent status code which
			has been sent by the server or received by the client.";
			reference "RFC 8415: Dynamic Host Configuration Protocol
			for IPv6 (DHCPv6), Section 7.5.";
			container status {
			description
			"Status code information, relating to the success or failure
			of operations requested in messages.";
			leaf code {
			type uint16;
			description
			"The numeric code for the status encoded in this option.
			See the Status Codes registry at
			<https://www.iana.org/assignments/dhcpv6-parameters>
			for the current list of status codes.";
			}
			leaf message {
			type string;
			description
			"A UTF-8 encoded text string suitable for display to an
			end user. It MUST NOT be null-terminated.";
			}
			}
			}
			grouping auth-option-group {
			description
			"OPTION_AUTH (11) Authentication Option.";
			reference "RFC 8415: Dynamic Host Configuration Protocol
			for IPv6 (DHCPv6), Section 21.11
			IANA 'Dynamic Host Configuration Protocol (DHCP) Authentication
			Option Name Spaces' registry.
			<https://www.iana.org/assignments/auth-namespaces>";
			container auth-option {
			description
			"OPTION_AUTH (11) Authentication Option container.";
			leaf protocol {
			type uint8;
			description
			"The authentication protocol used by this Authentication
			option.";
			}
			leaf algorithm {
			type uint8;
			description
			"The algorithm used in the authentication protocol.";
			}
			leaf rdm {
			type uint8;
			description
			"The Replay Detection Method (RDM) used in this
			Authentication option.";
			}
			leaf replay-detection {
			type uint64;
			description
			"The replay detection information for the RDM.";
			}
			leaf auth-information {
			type string;
			description
			"The authentication information, as specified by the
			protocol and algorithm used in this Authentication
			option.";
			}
			}
			}
			grouping status-code-option-group {
			description
			"OPTION_STATUS_CODE (13) Status Code Option.";
			reference "RFC 8415: Dynamic Host Configuration Protocol
			for IPv6 (DHCPv6), Section 21.13";
			container status-code-option {
			description
			"OPTION_STATUS_CODE (13) Status Code Option container.";
			leaf status-code {
			type uint16;
			description
			"The numeric code for the status encoded in this option.
			See the Status Codes registry at
			<https://www.iana.org/assignments/dhcpv6-parameters>
			for the current list of status codes.";
			}
			leaf status-message {
			type string;
			description
			"A UTF-8 encoded text string suitable for display to an
			end user. It MUST NOT be null-terminated.";
			}
			}
			}
			grouping rapid-commit-option-group {
			description
			"OPTION_RAPID_COMMIT (14) Rapid Commit Option.";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 21.14";
			container rapid-commit-option {
			presence "Enable sending of this option";
			description
			"OPTION_RAPID_COMMIT (14) Rapid Commit Option container.";
			}
			}
			grouping vendor-specific-information-option-group {
			description
			"OPTION_VENDOR_OPTS (17) Vendor-specific Information
			Option.";
			reference "RFC 8415: Dynamic Host Configuration Protocol
			for IPv6 (DHCPv6), Section 21.17";
			container vendor-specific-information-options {
			description
			"OPTION_VENDOR_OPTS (17) Vendor-specific Information
			Option container.";
			list vendor-specific-information-option {
			key enterprise-number;
			description
			"The vendor-specific information option allows for
			multiple instances in a single message. Each list entry
			defines the contents of an instance of the option.";
			leaf enterprise-number {
			type uint32;
			description
			"The vendor's registered Enterprise Number, as
			maintained by IANA.";
			reference "IANA 'Private Enterprise Numbers' registry.
			<https://www.iana.org/assignments/enterprise-numbers>";
			}
			list vendor-option-data {
			key sub-option-code;
			description
			"Vendor options, interpreted by vendor-specific
			client/server functions.";
			leaf sub-option-code {
			type uint16;
			description
			"The code for the sub-option.";
			}
			leaf sub-option-data {
			type string {
			pattern '([0-9a-fA-F]{2}){0,}';
			}
			description
			"The data area for the sub-option.";
			}
			}
			}
			}
			}
			grouping reconfigure-accept-option-group {
			description
			"OPTION_RECONF_ACCEPT (20) Reconfigure Accept Option.
			A client uses the Reconfigure Accept option to announce to
			the server whether the client is willing to accept Reconfigure
			messages, and a server uses this option to tell the client
			whether or not to accept Reconfigure messages. In the absence
			of this option, the default behavior is that the client is
			unwilling to accept Reconfigure messages. The presence node
			is used to enable the option.";
			reference "RFC 8415: Dynamic Host Configuration Protocol
			for IPv6 (DHCPv6), Section 21.20";
			container reconfigure-accept-option {
			presence "Enable sending of this option";
			description
			"OPTION_RECONF_ACCEPT (20) Reconfigure Accept Option
			container.";
			}
			}
			}
			<CODE ENDS>
			4.2. DHCPv6 Server YANG Module
	This module imports typedefs from [RFC6991], [RFC8343].		This module imports typedefs from [RFC6991], [RFC8343].
	<CODE BEGINS> file "ietf-dhcpv6-server@2021-07-02.yang"		<CODE BEGINS> file "ietf-dhcpv6-server@2021-10-25.yang"
	module ietf-dhcpv6-server {		module ietf-dhcpv6-server {
	yang-version 1.1;		yang-version 1.1;
	namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-server";		namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-server";
	prefix "dhc6-srv";		prefix "dhc6-srv";
	import ietf-inet-types {		import ietf-inet-types {
	prefix inet;		prefix inet;
	reference		reference
	"RFC 6991: Common YANG Data Types";		"RFC 6991: Common YANG Data Types";
	skipping to change at page 21, line 9 ¶		skipping to change at page 29, line 49 ¶
	Redistribution and use in source and binary forms, with or		Redistribution and use in source and binary forms, with or
	without modification, is permitted pursuant to, and subject		without modification, is permitted pursuant to, and subject
	to the license terms contained in, the Simplified BSD License		to the license terms contained in, the Simplified BSD License
	set forth in Section 4.c of the IETF Trust's Legal Provisions		set forth in Section 4.c of the IETF Trust's Legal Provisions
	Relating to IETF Documents		Relating to IETF Documents
	(https://trustee.ietf.org/license-info).		(https://trustee.ietf.org/license-info).
	This version of this YANG module is part of RFC XXXX; see		This version of this YANG module is part of RFC XXXX; see
	the RFC itself for full legal notices.";		the RFC itself for full legal notices.";
	revision 2021-07-02 {		revision 2021-10-25 {
	description		description
	"Initial Revision.";		"Initial Revision.";
	reference		reference
	"XXXX: YANG Data Model for DHCPv6 Configuration";		"XXXX: YANG Data Model for DHCPv6 Configuration";
	}		}
	/*		/*
	* Features		* Features
	*/		*/
			feature na-assignment {
			description
			"Denotes that the server implements DHCPv6 non-temporary
			address assignment.";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 6.2";
			}
	feature prefix-delegation {		feature prefix-delegation {
	description		description
	"Denotes that the server implements DHCPv6 prefix		"Denotes that the server implements DHCPv6 prefix
	delegation.";		delegation.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 6.3";		IPv6 (DHCPv6), Section 6.3";
	}		}
	/*		/*
	* Groupings		* Groupings
	skipping to change at page 21, line 42 ¶		skipping to change at page 30, line 41 ¶
	grouping resource-config {		grouping resource-config {
	description		description
	"Nodes that are reused at multiple levels in the DHCPv6		"Nodes that are reused at multiple levels in the DHCPv6
	server's addressing hierarchy.";		server's addressing hierarchy.";
	leaf-list option-set-id {		leaf-list option-set-id {
	type leafref {		type leafref {
	path "/dhcpv6-server/option-sets/option-set/option-set-id";		path "/dhcpv6-server/option-sets/option-set/option-set-id";
	}		}
	description		description
	"The ID field of relevant set of DHCPv6 options (option-set)		"The ID field of relevant set of DHCPv6 options (option-set)
	to be provisioned to clients using the network-range.";		to be provisioned to clients using the allocation-range.";
	}		}
	leaf valid-lifetime {		leaf valid-lifetime {
	type dhc6:timer-seconds32;		type dhc6:timer-seconds32;
	description		description
	"Valid lifetime for the Identity Association (IA).";		"Valid lifetime for the Identity Association (IA).";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 6";		IPv6 (DHCPv6), Section 6";
	}		}
	leaf renew-time {		leaf renew-time {
	type dhc6:timer-seconds32;		type dhc6:timer-seconds32;
	skipping to change at page 29, line 23 ¶		skipping to change at page 38, line 21 ¶
	"DHCPv6 servers use a 'class-selector' function in order		"DHCPv6 servers use a 'class-selector' function in order
	to identify and classify incoming client messages		to identify and classify incoming client messages
	so that they can be given the correct configuration.		so that they can be given the correct configuration.
	The mechanisms used for implementing this function vary		The mechanisms used for implementing this function vary
	greatly between different implementations such it is not		greatly between different implementations such it is not
	possible to include in this module. This container provides		possible to include in this module. This container provides
	a location for server implementors to augment their own		a location for server implementors to augment their own
	class-selector YANG.";		class-selector YANG.";
	}		}
	container network-ranges {		container allocation-ranges {
	description		description
	"This model is based on an address and parameter		"This model is based on an address and parameter
	allocation hierarchy. The top level is 'global' - which		allocation hierarchy. The top level is 'global' - which
	is defined as the container for all network-ranges. Under		is defined as the container for all allocation-ranges. Under
	this are the individual network-ranges.";		this are the individual allocation-ranges.";
	uses resource-config;		uses resource-config;
	list network-range {		list allocation-range {
	key id;		key id;
	description		description
	"Network-ranges are identified by the 'id' key.";		"Network-ranges are identified by the 'id' key.";
	leaf id {		leaf id {
	type uint32;		type uint32;
	mandatory true;		mandatory true;
	description		description
	"Unique identifier for the network range.";		"Unique identifier for the allocation range.";
	}		}
	leaf description {		leaf description {
	type string;		type string;
	description		description
	"Description for the network range.";		"Description for the allocation range.";
	}		}
	leaf network-prefix {		leaf network-prefix {
	type inet:ipv6-prefix;		type inet:ipv6-prefix;
	mandatory true;		mandatory true;
	description		description
	"Network prefix.";		"Network prefix.";
	}		}
	uses resource-config;		uses resource-config;
	container address-pools {		container address-pools {
			if-feature na-assignment;
	description		description
	"Configuration for the DHCPv6 server's		"Configuration for the DHCPv6 server's
	address pools.";		address pools.";
	list address-pool {		list address-pool {
	key pool-id;		key pool-id;
	description		description
	"List of address pools for allocation to clients,		"List of address pools for allocation to clients,
	distinguished by 'pool-id'.";		distinguished by 'pool-id'.";
	leaf pool-id {		leaf pool-id {
	type uint32;		type string;
	mandatory true;		mandatory true;
	description		description
	"Unique identifier for the pool.";		"Unique identifier for the pool.";
	}		}
	leaf pool-prefix {		leaf pool-prefix {
	type inet:ipv6-prefix;		type inet:ipv6-prefix;
	mandatory true;		mandatory true;
	description		description
	"IPv6 prefix for the pool.";		"IPv6 prefix for the pool.";
	}		}
	skipping to change at page 32, line 4 ¶		skipping to change at page 40, line 51 ¶
	"List of active address leases.";		"List of active address leases.";
	leaf leased-address {		leaf leased-address {
	type inet:ipv6-address;		type inet:ipv6-address;
	description		description
	"Active address lease entry.";		"Active address lease entry.";
	}		}
	uses lease-information;		uses lease-information;
	}		}
	}		}
	}		}
	}		}
	container prefix-pools {		container prefix-pools {
	if-feature prefix-delegation;		if-feature prefix-delegation;
	description		description
	"Configuration for the DHCPv6 server's prefix pools.";		"Configuration for the DHCPv6 server's prefix pools.";
	list prefix-pool {		list prefix-pool {
	key pool-id;		key pool-id;
	description		description
	"List of prefix pools for allocation to		"List of prefix pools for allocation to
	clients, distinguished by 'pool-id'.";		clients, distinguished by 'pool-id'.";
	leaf pool-id {		leaf pool-id {
	type uint32;		type string;
	mandatory true;		mandatory true;
	description		description
	"Unique identifier for the pool.";		"Unique identifier for the pool.";
	}		}
	leaf pool-prefix {		leaf pool-prefix {
	type inet:ipv6-prefix;		type inet:ipv6-prefix;
	mandatory true;		mandatory true;
	description		description
	"IPv6 prefix for the pool.";		"IPv6 prefix for the pool.";
	}		}
	skipping to change at page 34, line 4 ¶		skipping to change at page 42, line 51 ¶
	description		description
	"List of active prefix leases.";		"List of active prefix leases.";
	leaf leased-prefix {		leaf leased-prefix {
	type inet:ipv6-prefix;		type inet:ipv6-prefix;
	description		description
	"Active leased prefix entry.";		"Active leased prefix entry.";
	}		}
	uses lease-information;		uses lease-information;
	}		}
	}		}
	}		}
	}		}
	}		}
	uses message-stats;		uses message-stats;
	}		}
	}		}
	/*		/*
	* RPCs		* RPCs
	*/		*/
	rpc delete-address-lease {		rpc delete-address-lease {
	nacm:default-deny-all;		nacm:default-deny-all;
			if-feature na-assignment;
	description		description
	"Deletes a client's active address lease from the		"Deletes a client's active address lease from the
	server's lease database. Note this will not cause the address		server's lease database. Note this will not cause the address
	to be revoked from the client, and the lease may be refreshed		to be revoked from the client, and the lease may be refreshed
	or renewed by the client.";		or renewed by the client.";
	input {		input {
	leaf lease-address-to-delete {		leaf lease-address-to-delete {
	type leafref {		type leafref {
	path "../../dhcpv6-server/network-ranges/network-range" +		path "../../dhcpv6-server/allocation-ranges/" +
	"/address-pools/address-pool/active-leases" +		"allocation-range/address-pools/address-pool" +
	"/active-lease/leased-address";		"/active-leases/active-lease/leased-address";
	}		}
	mandatory true;		mandatory true;
	description		description
	"IPv6 address of an active lease that will be		"IPv6 address of an active lease that will be
	deleted from the server.";		deleted from the server.";
	}		}
	}		}
	output {		output {
	leaf return-message {		leaf return-message {
	type string;		type string;
	skipping to change at page 35, line 8 ¶		skipping to change at page 44, line 8 ¶
	if-feature prefix-delegation;		if-feature prefix-delegation;
	description		description
	"Deletes a client's active prefix lease from the		"Deletes a client's active prefix lease from the
	server's lease database. Note, this will not cause the prefix		server's lease database. Note, this will not cause the prefix
	to be revoked from the client, and the lease may be refreshed		to be revoked from the client, and the lease may be refreshed
	or renewed by the client.";		or renewed by the client.";
	input {		input {
	leaf lease-prefix-to-delete {		leaf lease-prefix-to-delete {
	type leafref {		type leafref {
	path "../../dhcpv6-server/network-ranges/network-range" +		path "../../dhcpv6-server/allocation-ranges/" +
	"/prefix-pools/prefix-pool/active-leases/active-lease" +		"allocation-range/prefix-pools/prefix-pool" +
	"/leased-prefix";		"/active-leases/active-lease/leased-prefix";
	}		}
	mandatory true;		mandatory true;
	description		description
	"IPv6 prefix of an active lease that will be deleted		"IPv6 prefix of an active lease that will be deleted
	from the server.";		from the server.";
	}		}
	}		}
	output {		output {
	leaf return-message {		leaf return-message {
	type string;		type string;
	skipping to change at page 35, line 32 ¶		skipping to change at page 44, line 32 ¶
	"Response message from the server.";		"Response message from the server.";
	}		}
	}		}
	}		}
	/*		/*
	* Notifications		* Notifications
	*/		*/
	notification address-pool-utilization-threshold-exceeded {		notification address-pool-utilization-threshold-exceeded {
			if-feature na-assignment;
	description		description
	"Notification sent when the address pool		"Notification sent when the address pool
	utilization exceeds the threshold configured in		utilization exceeds the threshold configured in
	max-address-utilization.";		max-address-utilization.";
	leaf pool-id {		leaf pool-id {
	type leafref {		type leafref {
	path "../../dhcpv6-server/network-ranges/network-range/" +		path "../../dhcpv6-server/allocation-ranges/" +
	"address-pools/address-pool/pool-id";		"allocation-range/address-pools/address-pool" +
			"/pool-id";
	}		}
	mandatory true;		mandatory true;
	description		description
	"Leafref to the address pool that the notification		"Leafref to the address pool that the notification
	is being generated for.";		is being generated for.";
	}		}
	leaf total-pool-addresses {		leaf total-pool-addresses {
	type uint64;		type uint64;
	mandatory true;		mandatory true;
	description		description
	skipping to change at page 36, line 30 ¶		skipping to change at page 45, line 32 ¶
	}		}
	notification prefix-pool-utilization-threshold-exceeded {		notification prefix-pool-utilization-threshold-exceeded {
	if-feature prefix-delegation;		if-feature prefix-delegation;
	description		description
	"Notification sent when the prefix pool utilization		"Notification sent when the prefix pool utilization
	exceeds the threshold configured in		exceeds the threshold configured in
	max-pd-space-utilization.";		max-pd-space-utilization.";
	leaf pool-id {		leaf pool-id {
	type leafref {		type leafref {
	path "../../dhcpv6-server/network-ranges/network-range/" +		path "../../dhcpv6-server/allocation-ranges" +
	"prefix-pools/prefix-pool/pool-id";		"/allocation-range/prefix-pools/prefix-pool/pool-id";
	}		}
	mandatory true;		mandatory true;
	description		description
	"Unique identifier for the pool.";		"Unique identifier for the pool.";
	}		}
	leaf total-pool-prefixes {		leaf total-pool-prefixes {
	type uint64;		type uint64;
	mandatory true;		mandatory true;
	description		description
	"Total number of prefixes in the pool.";		"Total number of prefixes in the pool.";
	skipping to change at page 37, line 51 ¶		skipping to change at page 47, line 4 ¶
	description		description
	"Release (8) message.";		"Release (8) message.";
	}		}
	enum decline {		enum decline {
	description		description
	"Decline (9) message.";		"Decline (9) message.";
	}		}
	enum info-request {		enum info-request {
	description		description
	"Information request (11) message.";		"Information request (11) message.";
	}		}
	}		}
	description		description
	"The message type received by the server that has caused		"The message type received by the server that has caused
	the error.";		the error.";
	}		}
	leaf duid {		leaf duid {
	type dhc6:duid;		type dhc6:duid;
	description		description
	"Client DUID.";		"Client DUID.";
	}		}
	leaf description {		leaf description {
	type string;		type string;
	description		description
	"Description of the event (e.g., and error code or log		"Description of the event (e.g., and error code or log
	message).";		message).";
	}		}
	}		}
	notification decline-received {		notification decline-received {
			if-feature na-assignment;
	description		description
	"Notification sent when the server has received a		"Notification sent when the server has received a
	Decline (9) message from a client.";		Decline (9) message from a client.";
	leaf duid {		leaf duid {
	type dhc6:duid;		type dhc6:duid;
	description		description
	"Client DUID.";		"Client DUID.";
	}		}
	list declined-resources {		list declined-resources {
	description		description
	skipping to change at page 38, line 49 ¶		skipping to change at page 48, line 4 ¶
	description		description
	"Address that has been declined.";		"Address that has been declined.";
	}		}
	}		}
	case declined-prefix {		case declined-prefix {
	leaf prefix {		leaf prefix {
	type inet:ipv6-prefix;		type inet:ipv6-prefix;
	description		description
	"Prefix that has been declined.";		"Prefix that has been declined.";
	}		}
	}		}
	}		}
	}		}
	}		}
	notification non-success-code-sent {		notification non-success-code-sent {
	description		description
	"Notification sent when the server responded		"Notification sent when the server responded
	to a client with non-success status code.";		to a client with non-success status code.";
	leaf duid {		leaf duid {
	type dhc6:duid;		type dhc6:duid;
	description		description
	"Client DUID.";		"Client DUID.";
	}		}
	uses dhc6:status;		uses dhc6:status;
	}		}
	}		}
	<CODE ENDS>		<CODE ENDS>
	3.2. DHCPv6 Relay YANG Module		4.3. DHCPv6 Relay YANG Module
	This module imports typedefs from [RFC6991], [RFC8343].		This module imports typedefs from [RFC6991], [RFC8343].
	<CODE BEGINS> file "ietf-dhcpv6-relay@2021-07-02.yang"		<CODE BEGINS> file "ietf-dhcpv6-relay@2021-10-25.yang"
	module ietf-dhcpv6-relay {		module ietf-dhcpv6-relay {
	yang-version 1.1;		yang-version 1.1;
	namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-relay";		namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-relay";
	prefix "dhc6-rly";		prefix "dhc6-rly";
	import ietf-inet-types {		import ietf-inet-types {
	prefix inet;		prefix inet;
	reference		reference
	"RFC 6991: Common YANG Data Types";		"RFC 6991: Common YANG Data Types";
	skipping to change at page 40, line 43 ¶		skipping to change at page 49, line 46 ¶
	Redistribution and use in source and binary forms, with or		Redistribution and use in source and binary forms, with or
	without modification, is permitted pursuant to, and subject		without modification, is permitted pursuant to, and subject
	to the license terms contained in, the Simplified BSD License		to the license terms contained in, the Simplified BSD License
	set forth in Section 4.c of the IETF Trust's Legal Provisions		set forth in Section 4.c of the IETF Trust's Legal Provisions
	Relating to IETF Documents		Relating to IETF Documents
	(https://trustee.ietf.org/license-info).		(https://trustee.ietf.org/license-info).
	This version of this YANG module is part of RFC XXXX; see		This version of this YANG module is part of RFC XXXX; see
	the RFC itself for full legal notices.";		the RFC itself for full legal notices.";
	revision 2021-07-02 {		revision 2021-10-25 {
	description		description
	"Initial Revision.";		"Initial Revision.";
	reference		reference
	"XXXX: YANG Data Model for DHCPv6 Configuration";		"XXXX: YANG Data Model for DHCPv6 Configuration";
	}		}
	/*		/*
	* Features		* Features
	*/		*/
	feature prefix-delegation {		feature prefix-delegation {
	description		description
	"Enable if the relay functions as a delegating router for		"Enable if the relay functions as a delegating router for
	DHCPv6 prefix delegation.";		DHCPv6 prefix delegation.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 6.3";		IPv6 (DHCPv6), Section 6.3";
	skipping to change at page 49, line 4 ¶		skipping to change at page 58, line 6 ¶
	path "../../../dhcpv6-relay/relay-if/if-name";		path "../../../dhcpv6-relay/relay-if/if-name";
	}		}
	description		description
	"Name of the interface that has been removed.";		"Name of the interface that has been removed.";
	}		}
	leaf last-ipv6-addr {		leaf last-ipv6-addr {
	type inet:ipv6-address;		type inet:ipv6-address;
	description		description
	"Last IPv6 address configured on the interface.";		"Last IPv6 address configured on the interface.";
	}		}
	}		}
	}		}
	}		}
	<CODE ENDS>		<CODE ENDS>
	3.3. DHCPv6 Client YANG Module		4.4. DHCPv6 Client YANG Module
	This module imports typedefs from [RFC6991], [RFC8343].		This module imports typedefs from [RFC6991], [RFC8343].
	<CODE BEGINS> file "ietf-dhcpv6-client@2021-07-02.yang"		<CODE BEGINS> file "ietf-dhcpv6-client@2021-10-25.yang"
	module ietf-dhcpv6-client {		module ietf-dhcpv6-client {
	yang-version 1.1;		yang-version 1.1;
	namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-client";		namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-client";
	prefix "dhc6-clnt";		prefix "dhc6-clnt";
	import ietf-inet-types {		import ietf-inet-types {
	prefix inet;		prefix inet;
	reference		reference
	"RFC 6991: Common YANG Data Types";		"RFC 6991: Common YANG Data Types";
	skipping to change at page 50, line 33 ¶		skipping to change at page 59, line 35 ¶
	Redistribution and use in source and binary forms, with or		Redistribution and use in source and binary forms, with or
	without modification, is permitted pursuant to, and subject		without modification, is permitted pursuant to, and subject
	to the license terms contained in, the Simplified BSD License		to the license terms contained in, the Simplified BSD License
	set forth in Section 4.c of the IETF Trust's Legal Provisions		set forth in Section 4.c of the IETF Trust's Legal Provisions
	Relating to IETF Documents		Relating to IETF Documents
	(https://trustee.ietf.org/license-info).		(https://trustee.ietf.org/license-info).
	This version of this YANG module is part of RFC XXXX; see		This version of this YANG module is part of RFC XXXX; see
	the RFC itself for full legal notices.";		the RFC itself for full legal notices.";
	revision 2021-07-02 {		revision 2021-10-25 {
	description		description
	"Initial Revision.";		"Initial Revision.";
	reference		reference
	"XXXX: YANG Data Model for DHCPv6 Configuration";		"XXXX: YANG Data Model for DHCPv6 Configuration";
	}		}
	/*		/*
	* Features		* Features
	*/		*/
	feature non-temporary-address {		feature non-temp-addr {
	description		description
	"Denotes that the client supports DHCPv6 non-temporary address		"Denotes that the client supports DHCPv6 non-temporary address
	allocations.";		allocations.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 6.2";		IPv6 (DHCPv6), Section 6.2";
	}		}
	feature prefix-delegation {
			feature prefix-del {
	description		description
	"Denotes that the client implements DHCPv6 prefix		"Denotes that the client implements DHCPv6 prefix
	delegation.";		delegation.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 6.3";		IPv6 (DHCPv6), Section 6.3";
	}		}
	feature temporary-address {		feature temp-addr {
	description		description
	"Denotes that the client supports DHCPv6 temporary address		"Denotes that the client supports DHCPv6 temporary address
	allocations.";		allocations.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 6.5";		IPv6 (DHCPv6), Section 6.5";
	}		}
			feature anon-profile {
			description
			"Denotes that the client supports DHCP anonymity
			profiles.";
			reference "RFC 7844: Anonymity Profiles for DHCP Clients";
			}
	/*		/*
	* Groupings		* Groupings
	*/		*/
	grouping message-statistics {		grouping message-statistics {
	description		description
	"Counters for DHCPv6 messages.";		"Counters for DHCPv6 messages.";
	leaf solicit-count {		leaf solicit-count {
	type uint32;		type uint32;
	config "false";		config "false";
	skipping to change at page 55, line 43 ¶		skipping to change at page 65, line 4 ¶
	*/		*/
	container dhcpv6-client {		container dhcpv6-client {
	description		description
	"DHCPv6 client configuration and state.";		"DHCPv6 client configuration and state.";
	leaf enabled {		leaf enabled {
	type boolean;		type boolean;
	default true;		default true;
	description		description
	"Globally enables the DHCP client function.";		"Globally enables the DHCP client function.";
			}
			leaf client-duid {
			if-feature "non-temp-addr or prefix-del " +
			"or temp-addr and not anon-profile";
			type dhc6:duid;
			description
			"A single Client DUID that will be used by all of the
			client's DHCPv6 enabled interfaces.";
			reference "RFC 8415: Dynamic Host Configuration Protocol for
			IPv6 (DHCPv6), Section 11";
	}		}
	list client-if {		list client-if {
	key if-name;		key if-name;
	description		description
	"The list of interfaces for which the client will		"The list of interfaces for which the client will
	be requesting DHCPv6 configuration.";		be requesting DHCPv6 configuration.";
	leaf if-name {		leaf if-name {
	type if:interface-ref;		type if:interface-ref;
	mandatory true;		mandatory true;
	description		description
	"Reference to the interface entry that the requested		"Reference to the interface entry that the requested
	configuration is relevant to.";		configuration is relevant to.";
	}		}
	leaf enabled {		leaf enabled {
	type boolean;		type boolean;
	default true;		default true;
	description		description
	"Enables the DHCP client function for this interface.";		"Enables the DHCP client function for this interface.";
	}		}
	leaf duid {		leaf interface-duid {
			if-feature "non-temp-addr or prefix-del " +
			"or temp-addr and anon-profile";
	type dhc6:duid;		type dhc6:duid;
	description		description
	"Client DUID.";		"Per-interface Client DUIDs for use with DHCP anonymity
	reference "RFC 8415: Dynamic Host Configuration Protocol for		profiles.";
	IPv6 (DHCPv6), Section 11";		reference "RFC 7844: Anonymity Profiles for DHCP Clients,
			Section 3";
	}		}
	container client-configured-options {		container client-configured-options {
	description		description
	"Definitions for DHCPv6 options that can be be sent by		"Definitions for DHCPv6 options that can be be sent by
	the client. Additional option definitions can be		the client. Additional option definitions can be
	augmented to this location from other YANG modules as		augmented to this location from other YANG modules as
	required.";		required.";
	uses option-request-option-group;		uses option-request-option-group;
	uses dhc6:rapid-commit-option-group;		uses dhc6:rapid-commit-option-group;
	uses user-class-option-group;		uses user-class-option-group;
	uses vendor-class-option-group;		uses vendor-class-option-group;
	uses dhc6:vendor-specific-information-option-group;		uses dhc6:vendor-specific-information-option-group;
	uses dhc6:reconfigure-accept-option-group;		uses dhc6:reconfigure-accept-option-group;
	}		}
	list ia-na {		list ia-na {
	if-feature non-temporary-address;		if-feature non-temp-addr;
	key ia-id;		key ia-id;
	description		description
	"Configuration relevant for an IA_NA (Identity Association		"Configuration relevant for an IA_NA (Identity Association
	for Non-temporary Addresses).";		for Non-temporary Addresses).";
	reference "RFC 8415: Dynamic Host Configuration Protocol		reference "RFC 8415: Dynamic Host Configuration Protocol
	for IPv6 (DHCPv6), Section 13.1";		for IPv6 (DHCPv6), Section 13.1";
	leaf ia-id {		leaf ia-id {
	type uint32;		type uint32;
	description		description
	"A unique identifier for this IA_NA.";		"A unique identifier for this IA_NA.";
	skipping to change at page 57, line 30 ¶		skipping to change at page 67, line 4 ¶
	contact the server from which the addresses in the		contact the server from which the addresses in the
	IA_NA were obtained to extend the lifetimes of the		IA_NA were obtained to extend the lifetimes of the
	addresses assigned to the IA_NA.";		addresses assigned to the IA_NA.";
	}		}
	leaf lease-t2 {		leaf lease-t2 {
	type dhc6:timer-seconds32;		type dhc6:timer-seconds32;
	description		description
	"The time interval after which the client should		"The time interval after which the client should
	contact any available server to extend the lifetimes		contact any available server to extend the lifetimes
	of the addresses assigned to the IA_NA.";		of the addresses assigned to the IA_NA.";
	}		}
	uses lease-state;		uses lease-state;
	}		}
	}		}
	list ia-ta {		list ia-ta {
	if-feature temporary-address;		if-feature temp-addr;
	key ia-id;		key ia-id;
	description		description
	"Configuration relevant for an IA_TA (Identity Association		"Configuration relevant for an IA_TA (Identity Association
	for Temporary Addresses).";		for Temporary Addresses).";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 13.2";		IPv6 (DHCPv6), Section 13.2";
	leaf ia-id {		leaf ia-id {
	type uint32;		type uint32;
	description		description
	"The unique identifier for this IA_TA.";		"The unique identifier for this IA_TA.";
	skipping to change at page 58, line 20 ¶		skipping to change at page 67, line 43 ¶
	"Information about an active IA_TA lease.";		"Information about an active IA_TA lease.";
	leaf ia-ta-address {		leaf ia-ta-address {
	type inet:ipv6-address;		type inet:ipv6-address;
	description		description
	"Address that is currently leased.";		"Address that is currently leased.";
	}		}
	uses lease-state;		uses lease-state;
	}		}
	}		}
	list ia-pd {		list ia-pd {
	if-feature prefix-delegation;		if-feature prefix-del;
	key ia-id;		key ia-id;
	description		description
	"Configuration relevant for an IA_PD (Identity Association		"Configuration relevant for an IA_PD (Identity Association
	for Prefix Delegation).";		for Prefix Delegation).";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 13.3";		IPv6 (DHCPv6), Section 13.3";
	leaf ia-id {		leaf ia-id {
	type uint32;		type uint32;
	description		description
	"The unique identifier for this IA_PD.";		"The unique identifier for this IA_PD.";
	reference "RFC 8415: Dynamic Host Configuration Protocol		reference "RFC 8415: Dynamic Host Configuration Protocol
	for IPv6 (DHCPv6), Section 12";		for IPv6 (DHCPv6), Section 12";
	}		}
			leaf prefix-length-hint {
			type uint8 {
			range "1..128";
			}
			description "Prefix-length hint value included
			in the messages sent to the server to indicate a
			preference for the size of the prefix to be delegated.";
			reference "RFC 8415: Dynamic Host Configuration Protocol
			for IPv6 (DHCPv6), Section 18.2.1";
			}
	container ia-pd-options {		container ia-pd-options {
	description		description
	"An augmentation point for additional options that the		"An augmentation point for additional options that the
	client will send in the IA_PD-options field of		client will send in the IA_PD-options field of
	OPTION_IA_TA.";		OPTION_IA_TA.";
	}		}
	container lease-state {		container lease-state {
	config "false";		config "false";
	description		description
	"Information about an active IA_PD delegated prefix.";		"Information about an active IA_PD delegated prefix.";
	skipping to change at page 59, line 28 ¶		skipping to change at page 69, line 13 ¶
	}		}
	uses message-statistics;		uses message-statistics;
	}		}
	}		}
	/*		/*
	* Notifications		* Notifications
	*/		*/
	notification invalid-ia-address-detected {		notification invalid-ia-address-detected {
	if-feature "non-temporary-address or temporary-address";		if-feature "non-temp-addr or temp-addr";
	description		description
	"Notification sent when an address received		"Notification sent when an address received
	in an identity association option is determined invalid.		in an identity association option is determined invalid.
	Possible conditions include a duplicate or otherwise illegal		Possible conditions include a duplicate or otherwise illegal
	address.";		address.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 18.2.10.1";		IPv6 (DHCPv6), Section 18.2.10.1";
	leaf ia-id {		leaf ia-id {
	type uint32;		type uint32;
	mandatory true;		mandatory true;
	skipping to change at page 62, line 4 ¶		skipping to change at page 71, line 38 ¶
	retries and timer values.";		retries and timer values.";
	}		}
	}		}
	notification unsuccessful-status-code {		notification unsuccessful-status-code {
	description		description
	"Notification sent when the client receives a message that		"Notification sent when the client receives a message that
	includes an unsuccessful Status Code option.";		includes an unsuccessful Status Code option.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 21.13";		IPv6 (DHCPv6), Section 21.13";
	leaf server-duid {		leaf server-duid {
	type dhc6:duid;		type dhc6:duid;
	mandatory true;		mandatory true;
	description		description
	"DUID of the server sending the unsuccessful		"DUID of the server sending the unsuccessful
	error code.";		error code.";
	}		}
	uses dhc6:status;		uses dhc6:status;
	}		}
	notification server-duid-changed {		notification server-duid-changed {
	if-feature "non-temporary-address or prefix-delegation or " +		if-feature "non-temp-addr or prefix-del or " +
	"temporary-address";		"temp-addr";
	description		description
	"Notification sent when the client receives a lease		"Notification sent when the client receives a lease
	from a server with different DUID to the one currently stored		from a server with different DUID to the one currently stored
	by the client, e.g., in response to a Rebind message.";		by the client, e.g., in response to a Rebind message.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for		reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 18.2.5";		IPv6 (DHCPv6), Section 18.2.5";
	leaf new-server-duid {		leaf new-server-duid {
	type dhc6:duid;		type dhc6:duid;
	mandatory true;		mandatory true;
	description		description
	"DUID of the new server.";		"DUID of the new server.";
	}		}
	leaf previous-server-duid {		leaf previous-server-duid {
	type dhc6:duid;		type dhc6:duid;
	mandatory true;		mandatory true;
	description		description
	"DUID of the previous server.";		"DUID of the previous server.";
	}		}
	leaf lease-ia-na {		leaf lease-ia-na {
	if-feature non-temporary-address;		if-feature non-temp-addr;
	type leafref {		type leafref {
	path "../../dhcpv6-client/client-if/ia-na/ia-id";		path "../../dhcpv6-client/client-if/ia-na/ia-id";
	}		}
	description		description
	"Reference to the IA_NA lease.";		"Reference to the IA_NA lease.";
	}		}
	leaf lease-ia-ta {		leaf lease-ia-ta {
	if-feature temporary-address;		if-feature temp-addr;
	type leafref {		type leafref {
	path "../../dhcpv6-client/client-if/ia-ta/ia-id";		path "../../dhcpv6-client/client-if/ia-ta/ia-id";
	}		}
	description		description
	"Reference to the IA_TA lease.";		"Reference to the IA_TA lease.";
	}		}
	leaf lease-ia-pd {		leaf lease-ia-pd {
	if-feature prefix-delegation;		if-feature prefix-del;
	type leafref {		type leafref {
	path "../../dhcpv6-client/client-if/ia-pd/ia-id";		path "../../dhcpv6-client/client-if/ia-pd/ia-id";
	}		}
	description		description
	"Reference to the IA_PD lease.";		"Reference to the IA_PD lease.";
	}		}
	}		}
	}		}
	<CODE ENDS>		<CODE ENDS>
	3.4. DHCPv6 Common YANG Module		5. Security Considerations
	This module imports typedefs from [RFC6991].
	<CODE BEGINS> file "ietf-dhcpv6-common@2021-07-02.yang"
	module ietf-dhcpv6-common {
	yang-version 1.1;
	namespace "urn:ietf:params:xml:ns:yang:ietf-dhcpv6-common";
	prefix "dhc6";
	organization
	"IETF DHC (Dynamic Host Configuration) Working Group";
	contact
	"WG Web: <https://datatracker.ietf.org/wg/dhc/>
	WG List: <mailto:dhcwg@ietf.org>
	Author: Yong Cui <yong@csnet1.cs.tsinghua.edu.cn>
	Author: Linhui Sun <lh.sunlinh@gmail.com>
	Editor: Ian Farrer <ian.farrer@telekom.de>
	Author: Sladjana Zeichlin <sladjana.zechlin@telekom.de>
	Author: Zihao He <hezihao9512@gmail.com>
	Author: Michal Nowikowski <godfryd@isc.org>";
	description
	"This YANG module defines common components used for the
	configuration and management of DHCPv6.
	The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL',
	'SHALL NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED',
	'NOT RECOMMENDED', 'MAY', and 'OPTIONAL' in this document
	are to be interpreted as described in BCP 14 (RFC 2119)
	(RFC 8174) when, and only when, they appear in all
	capitals, as shown here.
	Copyright (c) 2021 IETF Trust and the persons identified as
	authors of the code. All rights reserved.
	Redistribution and use in source and binary forms, with or
	without modification, is permitted pursuant to, and subject
	to the license terms contained in, the Simplified BSD License
	set forth in Section 4.c of the IETF Trust's Legal Provisions
	Relating to IETF Documents
	(https://trustee.ietf.org/license-info).
	This version of this YANG module is part of RFC XXXX; see
	the RFC itself for full legal notices.";
	revision 2021-07-02 {
	description
	"Initial Revision.";
	reference
	"XXXX: YANG Data Model for DHCPv6 Configuration";
	}
	typedef threshold {
	type uint8 {
	range 1..100;
	}
	description
	"Threshold value in percent.";
	}
	typedef timer-seconds32 {
	type uint32;
	units "seconds";
	description
	"Timer value type, in seconds (32-bit range).";
	}
	typedef duid-base {
	type string {
	pattern '([0-9a-fA-F]{2}){3,130}';
	}
	description
	"Each DHCP server and client has a DUID (DHCP Unique
	Identifier). The DUID consists of a two-octet
	type field and an arbitrary length (1-128 octets) content
	field. The duid-base type is used by other duid types with
	additional pattern constraints.
	Currently, there are four defined types of DUIDs
	in RFC 8415 and RFC 6355 - DUID-LLT, DUID-EN, DUID-LL
	and DUID-UUID. DUID-unstructured represents DUIDs which
	do not follow any of the defined formats.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 11
	RFC 6355: Definition of the UUID-Based DHCPv6 Unique
	Identifier (DUID-UUID), Section 4";
	}
	typedef duid-llt {
	type duid-base {
	pattern '0001'
	+ '[0-9a-fA-F]{12,}';
	}
	description
	"DUID type 1, based on Link-Layer Address Plus Time
	(DUID-LLT). Constructed with a 2-octet hardware type assigned
	by IANA, 4-octet containing the time the DUID is generated
	(represented in seconds since midnight (UTC), January 1, 2000,
	modulo 2^32), and a link-layer address. The address is encoded
	without separator characters. For example:
	+------+------+----------+--------------+
	| 0001 | 0006 | 28490058 | 00005E005300 |
	+------+------+----------+--------------+
	This example includes the 2-octet DUID type of 1 (0x01), the
	hardware type is 0x06 (IEEE Hardware Types) the creation
	time is 0x028490058 (constructed as described above). Finally,
	the link-layer address is 0x5E005300 (EUI-48 address
	00-00-5E-00-53-00)";
	reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 11.2
	IANA 'Hardware Types' registry.
	<https://www.iana.org/assignments/arp-parameters>";
	}
	typedef duid-en {
	type duid-base {
	pattern '0002'
	+ '[0-9a-fA-F]{4,}';
	}
	description
	"DUID type 2, assigned by vendor based on Enterprise
	Number (DUID-EN). This DUID consists of the 4-octet vendor's
	registered Private Enterprise Number as maintained by IANA
	followed by a unique identifier assigned by the vendor. For
	example:
	+------+----------+------------------+
	| 0002 | 00007ED9 | 0CC084D303000912 |
	+------+----------+------------------+
	This example includes the 2-octet DUID type of 2 (0x02),
	4-octets for the Enterprise Number (0x7ED9), followed by
	8-octets of identifier data (0x0CC084D303000912).";
	reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 11.3
	IANA 'Private Enterprise Numbers' registry.
	<https://www.iana.org/assignments/enterprise-numbers>";
	}
	typedef duid-ll {
	type duid-base {
	pattern '0003'
	+ '([0-9a-fA-F]){4,}';
	}
	description
	"DUID type 3, based on Link-Layer Address (DUID-LL).
	Constructed with a 2-octet hardware type assigned
	by IANA, and a link-layer address. The address is encoded
	without separator characters. For example:
	+------+------+--------------+
	| 0003 | 0006 | 00005E005300 |
	+------+------+--------------+
	This example includes the 2-octet DUID type of 3 (0x03), the
	hardware type is 0x06 (IEEE Hardware Types), and the link-layer
	address is 0x5E005300 (EUI-48 address 00-00-5E-00-53-00)";
	reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 11.4
	IANA 'Hardware Types' registry.
	<https://www.iana.org/assignments/arp-parameters>";
	}
	typedef duid-uuid {
	type duid-base {
	pattern '0004'
	+ '[0-9a-fA-F]{32}';
	}
	description
	"DUID type 4, based on Universally Unique Identifier
	(DUID-UUID). This type of DUID consists of 16 octets
	containing a 128-bit UUID. For example:
	+------+----------------------------------+
	| 0004 | 9f03b182705747e38a1e422910078642 |
	+------+----------------------------------+
	This example includes the 2-octet DUID type of 4 (0x04), and
	the UUID 9f03b182-7057-47e3-8a1e-422910078642.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 11.5
	RFC 6355: Definition of the UUID-Based DHCPv6 Unique Identifier
	(DUID-UUID)";
	}
	typedef duid-unstructured {
	type duid-base {
	pattern '[0-9a-fA-F]{3}'
	+ '[05-9a-fA-F]'
	+ '([0-9a-fA-F])*';
	}
	description
	"Used for DUIDs following any other formats than DUID
	types 1-4. For example:
	+----------------------------------+
	| 7b6a164d325946539dc540fb539bc430 |
	+----------------------------------+
	Here, an arbitrary 16-octet value is used. The only constraint
	placed on this is that the first 2-octects are not 0x01-0x04
	to avoid collision with the other defined DUID types
	(duid-llt, duid-en, duid-ll, or duid-uuid).";
	reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 11";
	}
	typedef duid {
	type union {
	type duid-llt;
	type duid-en;
	type duid-ll;
	type duid-uuid;
	type duid-unstructured;
	}
	description
	"Represents the DUID and is neutral to the DUID's construction
	format.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 11";
	}
	/*
	* Groupings
	*/
	grouping status {
	description
	"Holds information about the most recent status code which
	has been sent by the server or received by the client.";
	reference "RFC 8415: Dynamic Host Configuration Protocol
	for IPv6 (DHCPv6), Section 7.5.";
	container status {
	description
	"Status code information, relating to the success or failure
	of operations requested in messages.";
	leaf code {
	type uint16;
	description
	"The numeric code for the status encoded in this option.
	See the Status Codes registry at
	<https://www.iana.org/assignments/dhcpv6-parameters>
	for the current list of status codes.";
	}
	leaf message {
	type string;
	description
	"A UTF-8 encoded text string suitable for display to an
	end user. It MUST NOT be null-terminated.";
	}
	}
	}
	grouping auth-option-group {
	description
	"OPTION_AUTH (11) Authentication Option.";
	reference "RFC 8415: Dynamic Host Configuration Protocol
	for IPv6 (DHCPv6), Section 21.11
	IANA 'Dynamic Host Configuration Protocol (DHCP) Authentication
	Option Name Spaces' registry.
	<https://www.iana.org/assignments/auth-namespaces>";
	container auth-option {
	description
	"OPTION_AUTH (11) Authentication Option container.";
	leaf protocol {
	type uint8;
	description
	"The authentication protocol used by this Authentication
	option.";
	}
	leaf algorithm {
	type uint8;
	description
	"The algorithm used in the authentication protocol.";
	}
	leaf rdm {
	type uint8;
	description
	"The Replay Detection Method (RDM) used in this
	Authentication option.";
	}
	leaf replay-detection {
	type uint64;
	description
	"The replay detection information for the RDM.";
	}
	leaf auth-information {
	type string;
	description
	"The authentication information, as specified by the
	protocol and algorithm used in this Authentication
	option.";
	}
	}
	}
	grouping status-code-option-group {
	description
	"OPTION_STATUS_CODE (13) Status Code Option.";
	reference "RFC 8415: Dynamic Host Configuration Protocol
	for IPv6 (DHCPv6), Section 21.13";
	container status-code-option {
	description
	"OPTION_STATUS_CODE (13) Status Code Option container.";
	leaf status-code {
	type uint16;
	description
	"The numeric code for the status encoded in this option.
	See the Status Codes registry at
	<https://www.iana.org/assignments/dhcpv6-parameters>
	for the current list of status codes.";
	}
	leaf status-message {
	type string;
	description
	"A UTF-8 encoded text string suitable for display to an
	end user. It MUST NOT be null-terminated.";
	}
	}
	}
	grouping rapid-commit-option-group {
	description
	"OPTION_RAPID_COMMIT (14) Rapid Commit Option.";
	reference "RFC 8415: Dynamic Host Configuration Protocol for
	IPv6 (DHCPv6), Section 21.14";
	container rapid-commit-option {
	presence "Enable sending of this option";
	description
	"OPTION_RAPID_COMMIT (14) Rapid Commit Option container.";
	}
	}
	grouping vendor-specific-information-option-group {
	description
	"OPTION_VENDOR_OPTS (17) Vendor-specific Information
	Option.";
	reference "RFC 8415: Dynamic Host Configuration Protocol
	for IPv6 (DHCPv6), Section 21.17";
	container vendor-specific-information-options {
	description
	"OPTION_VENDOR_OPTS (17) Vendor-specific Information
	Option container.";
	list vendor-specific-information-option {
	key enterprise-number;
	description
	"The vendor-specific information option allows for
	multiple instances in a single message. Each list entry
	defines the contents of an instance of the option.";
	leaf enterprise-number {
	type uint32;
	description
	"The vendor's registered Enterprise Number, as
	maintained by IANA.";
	reference "IANA 'Private Enterprise Numbers' registry.
	<https://www.iana.org/assignments/enterprise-numbers>";
	}
	list vendor-option-data {
	key sub-option-code;
	description
	"Vendor options, interpreted by vendor-specific
	client/server functions.";
	leaf sub-option-code {
	type uint16;
	description
	"The code for the sub-option.";
	}
	leaf sub-option-data {
	type string {
	pattern '([0-9a-fA-F]{2}){0,}';
	}
	description
	"The data area for the sub-option.";
	}
	}
	}
	}
	}
	grouping reconfigure-accept-option-group {
	description
	"OPTION_RECONF_ACCEPT (20) Reconfigure Accept Option.
	A client uses the Reconfigure Accept option to announce to
	the server whether the client is willing to accept Reconfigure
	messages, and a server uses this option to tell the client
	whether or not to accept Reconfigure messages. In the absence
	of this option, the default behavior is that the client is
	unwilling to accept Reconfigure messages. The presence node
	is used to enable the option.";
	reference "RFC 8415: Dynamic Host Configuration Protocol
	for IPv6 (DHCPv6), Section 21.20";
	container reconfigure-accept-option {
	presence "Enable sending of this option";
	description
	"OPTION_RECONF_ACCEPT (20) Reconfigure Accept Option
	container.";
	}
	}
	}
	<CODE ENDS>
	4. Security Considerations
	The YANG modules defined in this document are designed to be accessed		The YANG modules defined in this document are designed to be accessed
	via network management protocols such as NETCONF [RFC6241] or		via network management protocols such as NETCONF [RFC6241] or
	RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport		RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport
	layer, and the mandatory-to-implement secure transport is Secure		layer, and the mandatory-to-implement secure transport is Secure
	Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the		Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the
	mandatory-to-implement secure transport is TLS [RFC8446].		mandatory-to-implement secure transport is TLS [RFC8446].
	The Network Configuration Access Control Model (NACM) [RFC8341]		The Network Configuration Access Control Model (NACM) [RFC8341]
	provides the means to restrict access for particular NETCONF or		provides the means to restrict access for particular NETCONF or
	skipping to change at page 72, line 42 ¶		skipping to change at page 74, line 12 ¶
	denial of service attack as traffic will no longer be routed to		denial of service attack as traffic will no longer be routed to
	the client.		the client.
	Some of the readable data nodes in this YANG module may be considered		Some of the readable data nodes in this YANG module may be considered
	sensitive or vulnerable in some network environments. Therefore, it		sensitive or vulnerable in some network environments. Therefore, it
	is important to control read access (e.g., only permitting get, get-		is important to control read access (e.g., only permitting get, get-
	config, or notifications) to these data nodes. These subtrees and		config, or notifications) to these data nodes. These subtrees and
	data nodes can be misused to track the activity of a host:		data nodes can be misused to track the activity of a host:
	* Information the server holds about clients with active leases:		* Information the server holds about clients with active leases:
	(dhc6-srv/network-ranges/network-range/address-pools/ address-		(dhc6-srv/allocation-ranges/allocation-range/address-pools/
	pool/active-leases)		address-pool/active-leases)
	* Information the relay holds about clients with active leases:		* Information the relay holds about clients with active leases:
	(dhc6-rly/relay-if/prefix-delegation/)		(dhc6-rly/relay-if/prefix-delegation/)
	Security considerations related to DHCPv6 are discussed in [RFC8415].		Security considerations related to DHCPv6 are discussed in [RFC8415].
	Security considerations given in [RFC7950] are also applicable here.		Security considerations given in [RFC7950] are also applicable here.
	5. IANA Considerations		6. IANA Considerations
	This document requests IANA to register the following URIs in the		This document requests IANA to register the following URIs in the
	"IETF XML Registry" [RFC3688]:		"IETF XML Registry" [RFC3688]:
	URI: urn:ietf:params:xml:ns:yang:ietf-dhcpv6-server		URI: urn:ietf:params:xml:ns:yang:ietf-dhcpv6-server
	Registrant Contact: The IESG.		Registrant Contact: The IESG.
	XML: N/A; the requested URI is an XML namespace.		XML: N/A; the requested URI is an XML namespace.
	URI: urn:ietf:params:xml:ns:yang:ietf-dhcpv6-relay		URI: urn:ietf:params:xml:ns:yang:ietf-dhcpv6-relay
	Registrant Contact: The IESG.		Registrant Contact: The IESG.
	skipping to change at page 74, line 5 ¶		skipping to change at page 75, line 17 ¶
	name: ietf-dhcpv6-client		name: ietf-dhcpv6-client
	namespace: urn:ietf:params:xml:ns:yang:ietf-dhcpv6-client		namespace: urn:ietf:params:xml:ns:yang:ietf-dhcpv6-client
	prefix: dhc6-clnt		prefix: dhc6-clnt
	reference: RFC XXXX YANG Data Model for DHCPv6 Configuration		reference: RFC XXXX YANG Data Model for DHCPv6 Configuration
	name: ietf-dhcpv6-common		name: ietf-dhcpv6-common
	namespace: urn:ietf:params:xml:ns:yang:ietf-dhcpv6-common		namespace: urn:ietf:params:xml:ns:yang:ietf-dhcpv6-common
	prefix: dhc6		prefix: dhc6
	reference: RFC XXXX YANG Data Model for DHCPv6 Configuration		reference: RFC XXXX YANG Data Model for DHCPv6 Configuration
	6. Acknowledgments		7. Acknowledgments
	The authors would like to thank Qi Sun, Lishan Li, Hao Wang, Tomek		The authors would like to thank Qi Sun, Lishan Li, Hao Wang, Tomek
	Mrugalski, Marcin Siodelski, Bernie Volz, Ted Lemon, Bing Liu, Tom		Mrugalski, Marcin Siodelski, Bernie Volz, Ted Lemon, Bing Liu, Tom
	Petch, and Acee Lindem for their valuable comments and contributions		Petch, and Acee Lindem for their valuable comments and contributions
	to this work.		to this work.
	7. Contributors		8. Contributors
	The following individuals are co-authors of this document:		The following individuals are co-authors of this document:
	Yong Cui		Yong Cui
	Tsinghua University		Tsinghua University
	Beijing, 100084		Beijing, 100084
	P.R. China		P.R. China
	Email: cuiyong@tsinghua.edu.cn		Email: cuiyong@tsinghua.edu.cn
	Linhui Sun		Linhui Sun
	skipping to change at page 74, line 47 ¶		skipping to change at page 76, line 36 ¶
	Beijing, 100084		Beijing, 100084
	P.R. China		P.R. China
	Email: hezihao9512@gmail.com		Email: hezihao9512@gmail.com
	Michal Nowikowski		Michal Nowikowski
	Internet Systems Consortium		Internet Systems Consortium
	Gdansk		Gdansk
	Poland		Poland
	Email: godfryd@isc.org		Email: godfryd@isc.org
	8. References		9. References
	8.1. Normative References		9.1. 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>.
	[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,		[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
	DOI 10.17487/RFC3688, January 2004,		DOI 10.17487/RFC3688, January 2004,
	<https://www.rfc-editor.org/info/rfc3688>.		<https://www.rfc-editor.org/info/rfc3688>.
	skipping to change at page 75, line 37 ¶		skipping to change at page 77, line 28 ¶
	<https://www.rfc-editor.org/info/rfc6241>.		<https://www.rfc-editor.org/info/rfc6241>.
	[RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure		[RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure
	Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,		Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
	<https://www.rfc-editor.org/info/rfc6242>.		<https://www.rfc-editor.org/info/rfc6242>.
	[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",		[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",
	RFC 6991, DOI 10.17487/RFC6991, July 2013,		RFC 6991, DOI 10.17487/RFC6991, July 2013,
	<https://www.rfc-editor.org/info/rfc6991>.		<https://www.rfc-editor.org/info/rfc6991>.
			[RFC7844] Huitema, C., Mrugalski, T., and S. Krishnan, "Anonymity
			Profiles for DHCP Clients", RFC 7844,
			DOI 10.17487/RFC7844, May 2016,
			<https://www.rfc-editor.org/info/rfc7844>.
	[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",		[RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
	RFC 7950, DOI 10.17487/RFC7950, August 2016,		RFC 7950, DOI 10.17487/RFC7950, August 2016,
	<https://www.rfc-editor.org/info/rfc7950>.		<https://www.rfc-editor.org/info/rfc7950>.
	[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC		[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
	2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,		2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
	May 2017, <https://www.rfc-editor.org/info/rfc8174>.		May 2017, <https://www.rfc-editor.org/info/rfc8174>.
	[RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF		[RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
	Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,		Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
	skipping to change at page 77, line 5 ¶		skipping to change at page 78, line 48 ¶
	Internet Assigned Numbers Authority, "Dynamic Host		Internet Assigned Numbers Authority, "Dynamic Host
	Configuration Protocol (DHCP) Authentication Option Name		Configuration Protocol (DHCP) Authentication Option Name
	Spaces",		Spaces",
	<https://www.iana.org/assignments/auth-namespaces>.		<https://www.iana.org/assignments/auth-namespaces>.
	[IANA-STATUS]		[IANA-STATUS]
	Internet Assigned Numbers Authority, "Dynamic Host		Internet Assigned Numbers Authority, "Dynamic Host
	Configuration Protocol for IPv6 (DHCPv6) Status Codes",		Configuration Protocol for IPv6 (DHCPv6) Status Codes",
	<https://www.iana.org/assignments/dhcpv6-parameters>.		<https://www.iana.org/assignments/dhcpv6-parameters>.
	8.2. Informative References		9.2. Informative References
	[RFC3319] Schulzrinne, H. and B. Volz, "Dynamic Host Configuration		[RFC3319] Schulzrinne, H. and B. Volz, "Dynamic Host Configuration
	Protocol (DHCPv6) Options for Session Initiation Protocol		Protocol (DHCPv6) Options for Session Initiation Protocol
	(SIP) Servers", RFC 3319, DOI 10.17487/RFC3319, July 2003,		(SIP) Servers", RFC 3319, DOI 10.17487/RFC3319, July 2003,
	<https://www.rfc-editor.org/info/rfc3319>.		<https://www.rfc-editor.org/info/rfc3319>.
	Appendix A. Data Tree Examples		Appendix A. Data Tree Examples
	This section contains XML examples of data trees for the different		This section contains XML examples of data trees for the different
	DHCPv6 elements.		DHCPv6 elements.
	A.1. DHCPv6 Server Configuration Example		A.1. DHCPv6 Server Configuration Examples
	The following example shows a basic configuration for a server. The		The following example shows a basic configuration for a server. The
	configuration defines:		configuration defines:
	* Enabling the DHCP server function		* Enabling the DHCP server function
	* The server's DUID		* The server's DUID
	* An option set (id=1) with configuration for the Solicit Max Retry		* An option set (id=1) with configuration for the Solicit Max Retry
	Timeout (SOL_MAX_RT (82)) option.		Timeout (SOL_MAX_RT (82)) option.
	skipping to change at page 78, line 20 ¶		skipping to change at page 80, line 20 ¶
	<option-sets>		<option-sets>
	<option-set>		<option-set>
	<option-set-id>1</option-set-id>		<option-set-id>1</option-set-id>
	<description>Example DHCP option set</description>		<description>Example DHCP option set</description>
	<sol-max-rt-option>		<sol-max-rt-option>
	<sol-max-rt-value>3600</sol-max-rt-value>		<sol-max-rt-value>3600</sol-max-rt-value>
	</sol-max-rt-option>		</sol-max-rt-option>
	</option-set>		</option-set>
	</option-sets>		</option-sets>
	<class-selector/>		<class-selector/>
	<network-ranges>		<allocation-ranges>
	<valid-lifetime>54000</valid-lifetime>		<valid-lifetime>54000</valid-lifetime>
	<renew-time>7200</renew-time>		<renew-time>7200</renew-time>
	<rebind-time>32400</rebind-time>		<rebind-time>32400</rebind-time>
	<preferred-lifetime>43200</preferred-lifetime>		<preferred-lifetime>43200</preferred-lifetime>
	<network-range>		<allocation-range>
	<id>1</id>		<id>1</id>
	<description>example-network-range</description>		<description>example-allocation-range</description>
	<network-prefix>2001:db8::/32</network-prefix>		<network-prefix>2001:db8::/32</network-prefix>
	<option-set-id>1</option-set-id>		<option-set-id>1</option-set-id>
	<address-pools>		<address-pools>
	<address-pool>		<address-pool>
	<pool-id>1</pool-id>		<pool-id>1</pool-id>
	<pool-prefix>2001:db8:1:1::/64</pool-prefix>		<pool-prefix>2001:db8:1:1::/64</pool-prefix>
	<start-address>2001:db8:1:1::1000</start-address>		<start-address>2001:db8:1:1::1000</start-address>
	<end-address>2001:db8:1:1::2000</end-address>		<end-address>2001:db8:1:1::2000</end-address>
	<max-address-utilization>50</max-address-utilization>		<max-address-utilization>50</max-address-utilization>
	<option-set-id>1</option-set-id>		<option-set-id>1</option-set-id>
	</address-pool>		</address-pool>
	</address-pools>		</address-pools>
	</network-range>		</allocation-range>
	</network-ranges>		</allocation-ranges>
	</dhcpv6-server>		</dhcpv6-server>
	Figure 4: Basic Server Configuration Example XML		Figure 4: Basic Server Configuration Example XML
	The following example shows a static host reservation within an		The following example shows a static host reservation within an
	address pool. The host's lease timers are configured to be longer		address pool. The host's lease timers are configured to be longer
	than hosts from the pool with dynamically assigned addresses.		than hosts from the pool with dynamically assigned addresses.
	<address-pools>		<address-pools>
	<address-pool>		<address-pool>
	skipping to change at page 79, line 33 ¶		skipping to change at page 81, line 33 ¶
	</host-reservations>		</host-reservations>
	</address-pool>		</address-pool>
	</address-pools>		</address-pools>
	Figure 5: Server Host Reservation Configuration Example XML		Figure 5: Server Host Reservation Configuration Example XML
	The following example shows configuration for a network range and		The following example shows configuration for a network range and
	pool to be used for delegating prefixes to clients. In this example,		pool to be used for delegating prefixes to clients. In this example,
	each client will receive a /56 prefix.		each client will receive a /56 prefix.
	The 'max-pd-space-utiliation' is set to 80 so that a 'prefix-pool-		The 'max-pd-space-utilization' is set to 80 so that a 'prefix-pool-
	utilization-threshold-exceeded' notification will be raised if the		utilization-threshold-exceeded' notification will be raised if the
	number of prefix allocations exceeds this.		number of prefix allocations exceeds this.
	<network-ranges>		<allocation-ranges>
	<network-range>		<allocation-range>
	<id>1</id>		<id>1</id>
	<description>prefix-pool-example</description>		<description>prefix-pool-example</description>
	<network-prefix>2001:db8::/32</network-prefix>		<network-prefix>2001:db8::/32</network-prefix>
	<prefix-pools>		<prefix-pools>
	<valid-lifetime>54000</valid-lifetime>		<valid-lifetime>54000</valid-lifetime>
	<renew-time>7200</renew-time>		<renew-time>7200</renew-time>
	<rebind-time>32400</rebind-time>		<rebind-time>32400</rebind-time>
	<preferred-lifetime>43200</preferred-lifetime>		<preferred-lifetime>43200</preferred-lifetime>
	<prefix-pool>		<prefix-pool>
	<pool-id>0</pool-id>		<pool-id>0</pool-id>
	<option-set-id>1</option-set-id>		<option-set-id>1</option-set-id>
	<pool-prefix>2001:db8:1::/48</pool-prefix>		<pool-prefix>2001:db8:1::/48</pool-prefix>
	<client-prefix-length>56</client-prefix-length>		<client-prefix-length>56</client-prefix-length>
	<max-pd-space-utilization>80</max-pd-space-utilization>		<max-pd-space-utilization>80</max-pd-space-utilization>
	</prefix-pool>		</prefix-pool>
	</prefix-pools>		</prefix-pools>
	</network-range>		</allocation-range>
	</network-ranges>		</allocation-ranges>
	Figure 6: Server Prefix Delegation Configuration Example XML		Figure 6: Server Prefix Delegation Configuration Example XML
	The next example shows the configuration of a set of options that may		The next example shows the configuration of a set of options that may
	be returned to clients, depending on the contents of a received DHCP		be returned to clients, depending on the contents of a received DHCP
	request message. The option set ID is '1', which will referenced by		request message. The option set ID is '1', which will referenced by
	other places in the configuration (e.g., address pool configuration)		other places in the configuration (e.g., address pool configuration)
	as the available options for clients that request them.		as the available options for clients that request them.
	The example shows how the option definitions can be extended via		The example shows how the option definitions can be extended via
	skipping to change at page 82, line 42 ¶		skipping to change at page 84, line 42 ¶
	<relay-options>		<relay-options>
	<interface-id-option>		<interface-id-option>
	<interface-id>EXAMPLE-INTERFACE-ID</interface-id>		<interface-id>EXAMPLE-INTERFACE-ID</interface-id>
	</interface-id-option>		</interface-id-option>
	</relay-options>		</relay-options>
	</relay-if>		</relay-if>
	</dhcpv6-relay>		</dhcpv6-relay>
	Figure 8: Basic Relay Configuration Example XML		Figure 8: Basic Relay Configuration Example XML
	A.3. DHCPv6 Client Configuration Examples		A.3. DHCPv6 Client Configuration Example
	The following example shows a basic configuration for a DHCP client		The following example shows a basic configuration for a DHCP client
	and its interaction with the ietf-interfaces module. The		and its interaction with the ietf-interfaces module. The
	configuration defines:		configuration defines:
	* Enabling the DHCP relay function globally and for the relevant		* Enabling the DHCP relay function globally and for the relevant
	interface.		interface.
	* References the interface that the client configuration is relevant		* References the interface that the client configuration is relevant
	for via an inteface-ref to the ietf-interfaces module.		for via an inteface-ref to the ietf-interfaces module.
	skipping to change at page 84, line 17 ¶		skipping to change at page 86, line 17 ¶
	<interface>		<interface>
	<name>eth0</name>		<name>eth0</name>
	<type>ianaift:ethernetCsmacd</type>		<type>ianaift:ethernetCsmacd</type>
	<description>DHCPv6 Relay Interface</description>		<description>DHCPv6 Relay Interface</description>
	<enabled>true</enabled>		<enabled>true</enabled>
	</interface>		</interface>
	</interfaces>		</interfaces>
	<dhcpv6-client		<dhcpv6-client
	xmlns="urn:ietf:params:xml:ns:yang:ietf-dhcpv6-client">		xmlns="urn:ietf:params:xml:ns:yang:ietf-dhcpv6-client">
	<enabled>true</enabled>		<enabled>true</enabled>
			<client-duid>000200090CC084D303000913</client-duid>
	<client-if>		<client-if>
	<if-name>eth0</if-name>		<if-name>eth0</if-name>
	<enabled>true</enabled>		<enabled>true</enabled>
	<duid>000200090CC084D303000913</duid>
	<client-configured-options>		<client-configured-options>
	<option-request-option>		<option-request-option>
	<oro-option>17</oro-option>		<oro-option>17</oro-option>
	<oro-option>23</oro-option>		<oro-option>23</oro-option>
	<oro-option>24</oro-option>		<oro-option>24</oro-option>
	<oro-option>82</oro-option>		<oro-option>82</oro-option>
	</option-request-option>		</option-request-option>
	<vendor-specific-information-options>		<vendor-specific-information-options>
	<vendor-specific-information-option>		<vendor-specific-information-option>
	<enterprise-number>32473</enterprise-number>		<enterprise-number>32473</enterprise-number>
	skipping to change at page 86, line 41 ¶		skipping to change at page 88, line 41 ¶
	Redistribution and use in source and binary forms, with or		Redistribution and use in source and binary forms, with or
	without modification, is permitted pursuant to, and subject		without modification, is permitted pursuant to, and subject
	to the license terms contained in, the Simplified BSD License		to the license terms contained in, the Simplified BSD License
	set forth in Section 4.c of the IETF Trust's Legal Provisions		set forth in Section 4.c of the IETF Trust's Legal Provisions
	Relating to IETF Documents		Relating to IETF Documents
	(https://trustee.ietf.org/license-info).		(https://trustee.ietf.org/license-info).
	This version of this YANG module is part of RFC XXXX; see		This version of this YANG module is part of RFC XXXX; see
	the RFC itself for full legal notices.";		the RFC itself for full legal notices.";
	revision 2021-07-02 {		revision 2021-10-25 {
	description		description
	"Initial Revision.";		"Initial Revision.";
	reference		reference
	"XXXX: YANG Data Model for DHCPv6 Configuration";		"XXXX: YANG Data Model for DHCPv6 Configuration";
	}		}
	/*		/*
	* Groupings		* Groupings
	*/		*/
	skipping to change at page 88, line 43 ¶		skipping to change at page 90, line 43 ¶
	So that they can be defined within option sets. However, there are		So that they can be defined within option sets. However, there are
	some options which are only applicable for specific deployment		some options which are only applicable for specific deployment
	scenarios and in these cases it may be more logical to augment the		scenarios and in these cases it may be more logical to augment the
	option group to a location relevant for the option.		option group to a location relevant for the option.
	One example for this could be OPTION_PD_EXCLUDE (67). This option is		One example for this could be OPTION_PD_EXCLUDE (67). This option is
	only relevant in combination with a delegated prefix which contains a		only relevant in combination with a delegated prefix which contains a
	specific prefix. In this case, the following location for the		specific prefix. In this case, the following location for the
	augmentation may be more suitable:		augmentation may be more suitable:
	'/dhc6-srv:dhc6-srv/dhc6-srv:network-ranges/dhc6-srv:network-range/		'/dhc6-srv:dhc6-srv/dhc6-srv:allocation-ranges/dhc6-srv:allocation-
	dhc6-srv:prefix-pools/dhc6-srv:prefix-pool"		range/dhc6-srv:prefix-pools/dhc6-srv:prefix-pool"
	Appendix C. Example Vendor Specific Server Configuration Module		Appendix C. Example Vendor Specific Server Configuration Module
	This section shows how to extend the server YANG module defined in		This section shows how to extend the server YANG module defined in
	this document with vendor specific configuration nodes, e.g.,		this document with vendor specific configuration nodes, e.g.,
	configuring access to a lease storage database.		configuring access to a lease storage database.
	The example module defines additional server attributes such as name		The example module defines additional server attributes such as name
	and description. Storage for leases is configured using a lease-		and description. Storage for leases is configured using a lease-
	storage container. It allows storing leases in one of three options:		storage container. It allows storing leases in one of three options:
	skipping to change at page 90, line 18 ¶		skipping to change at page 92, line 18 ¶
	Redistribution and use in source and binary forms, with or		Redistribution and use in source and binary forms, with or
	without modification, is permitted pursuant to, and subject		without modification, is permitted pursuant to, and subject
	to the license terms contained in, the Simplified BSD License		to the license terms contained in, the Simplified BSD License
	set forth in Section 4.c of the IETF Trust's Legal Provisions		set forth in Section 4.c of the IETF Trust's Legal Provisions
	Relating to IETF Documents		Relating to IETF Documents
	(https://trustee.ietf.org/license-info).		(https://trustee.ietf.org/license-info).
	This version of this YANG module is part of RFC XXXX; see		This version of this YANG module is part of RFC XXXX; see
	the RFC itself for full legal notices.";		the RFC itself for full legal notices.";
	revision 2021-07-02 {		revision 2021-10-25 {
	description		description
	"Initial Revision.";		"Initial Revision.";
	reference		reference
	"XXXX: YANG Data Model for DHCPv6 Configuration";		"XXXX: YANG Data Model for DHCPv6 Configuration";
	}		}
	/*		/*
	* Groupings		* Groupings
	*/		*/
	skipping to change at page 95, line 38 ¶		skipping to change at page 97, line 38 ¶
	specification for class selection, it only shows an example how it		specification for class selection, it only shows an example how it
	could be defined.		could be defined.
	At the end of the example augment statements are used to add the		At the end of the example augment statements are used to add the
	defined class selector rules into the overall DHCPv6 addressing		defined class selector rules into the overall DHCPv6 addressing
	hierarchy. This is done in two main parts:		hierarchy. This is done in two main parts:
	* The augmented class-selector configuration in the main DHCPv6		* The augmented class-selector configuration in the main DHCPv6
	Server configuration.		Server configuration.
	* client-class leafrefs augmented to "network-range", "address-pool"		* client-class leafrefs augmented to "allocation-range", "address-
	and "pd-pool", pointing to the "client-class-name" that is		pool" and "pd-pool", pointing to the "client-class-name" that is
	required.		required.
	The mechanism is as follows: class is associated to client based on		The mechanism is as follows: class is associated to client based on
	rules and then client is allowed to get address(es)/prefix(es) from		rules and then client is allowed to get address(es)/prefix(es) from
	given network-range/pool if the class name matches.		given allocation-range/pool if the class name matches.
	module example-dhcpv6-class-select {		module example-dhcpv6-class-select {
	yang-version 1.1;		yang-version 1.1;
	namespace "https://example.com/ns/" +		namespace "https://example.com/ns/" +
	"example-dhcpv6-class-select";		"example-dhcpv6-class-select";
	prefix "dhc6-class-sel";		prefix "dhc6-class-sel";
	import ietf-inet-types {		import ietf-inet-types {
	prefix inet;		prefix inet;
	}		}
	skipping to change at page 97, line 5 ¶		skipping to change at page 99, line 5 ¶
	Redistribution and use in source and binary forms, with or		Redistribution and use in source and binary forms, with or
	without modification, is permitted pursuant to, and subject		without modification, is permitted pursuant to, and subject
	to the license terms contained in, the Simplified BSD License		to the license terms contained in, the Simplified BSD License
	set forth in Section 4.c of the IETF Trust's Legal Provisions		set forth in Section 4.c of the IETF Trust's Legal Provisions
	Relating to IETF Documents		Relating to IETF Documents
	(https://trustee.ietf.org/license-info).		(https://trustee.ietf.org/license-info).
	This version of this YANG module is part of RFC XXXX; see		This version of this YANG module is part of RFC XXXX; see
	the RFC itself for full legal notices.";		the RFC itself for full legal notices.";
	revision 2021-07-02 {		revision 2021-10-25 {
	description		description
	"Initial Revision.";		"Initial Revision.";
	reference		reference
	"XXXX: YANG Data Model for DHCPv6 Configuration";		"XXXX: YANG Data Model for DHCPv6 Configuration";
	}		}
	/*		/*
	* Groupings		* Groupings
	*/		*/
	skipping to change at page 101, line 30 ¶		skipping to change at page 103, line 30 ¶
	key client-class-name;		key client-class-name;
	description		description
	"List of the client class identifiers applicable to		"List of the client class identifiers applicable to
	clients served by this address pool";		clients served by this address pool";
	uses client-class-id;		uses client-class-id;
	}		}
	}		}
	}		}
	augment "/dhc6-srv:dhcpv6-server/" +		augment "/dhc6-srv:dhcpv6-server/" +
	"dhc6-srv:network-ranges/dhc6-srv:network-range" {		"dhc6-srv:allocation-ranges/dhc6-srv:allocation-range" {
	description		description
	"Augment class selector functions to the DHCPv6 server		"Augment class selector functions to the DHCPv6 server
	network-ranges.";		allocation-ranges.";
	leaf-list client-class {		leaf-list client-class {
	type leafref {		type leafref {
	path "/dhc6-srv:dhcpv6-server/dhc6-srv:" +		path "/dhc6-srv:dhcpv6-server/dhc6-srv:" +
	"class-selector/client-classes/class/client-class-name";		"class-selector/client-classes/class/client-class-name";
	}		}
	description		description
	"Leafrefs to client classes.";		"Leafrefs to client classes.";
	}		}
	}		}
	augment "/dhc6-srv:dhcpv6-server/dhc6-srv:" +		augment "/dhc6-srv:dhcpv6-server/dhc6-srv:" +
	"network-ranges/dhc6-srv:network-range/dhc6-srv:" +		"allocation-ranges/dhc6-srv:allocation-range/dhc6-srv:" +
	"address-pools/dhc6-srv:address-pool" {		"address-pools/dhc6-srv:address-pool" {
	description		description
	"Augment class selector functions to the DHCPv6 server		"Augment class selector functions to the DHCPv6 server
	address-pools.";		address-pools.";
	leaf-list client-class {		leaf-list client-class {
	type leafref {		type leafref {
	path "/dhc6-srv:dhcpv6-server/dhc6-srv:" +		path "/dhc6-srv:dhcpv6-server/dhc6-srv:" +
	"class-selector/client-classes/class/client-class-name";		"class-selector/client-classes/class/client-class-name";
	}		}
	description		description
	"Leafrefs to client classes.";		"Leafrefs to client classes.";
	}		}
	}		}
	augment "/dhc6-srv:dhcpv6-server/dhc6-srv:" +		augment "/dhc6-srv:dhcpv6-server/dhc6-srv:" +
	"network-ranges/dhc6-srv:network-range/dhc6-srv:" +		"allocation-ranges/dhc6-srv:allocation-range/dhc6-srv:" +
	"prefix-pools/dhc6-srv:prefix-pool" {		"prefix-pools/dhc6-srv:prefix-pool" {
	description		description
	"Augment class selector functions to the DHCPv6		"Augment class selector functions to the DHCPv6
	server prefix-pools.";		server prefix-pools.";
	leaf-list client-class {		leaf-list client-class {
	type leafref {		type leafref {
	path "/dhc6-srv:dhcpv6-server/dhc6-srv:" +		path "/dhc6-srv:dhcpv6-server/dhc6-srv:" +
	"class-selector/client-classes/class/client-class-name";		"class-selector/client-classes/class/client-class-name";
	}		}
	description		description
End of changes. 125 change blocks.
	575 lines changed or deleted		645 lines changed or added
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