< draft-ietf-rtgwg-yang-vrrp-05.txt		draft-ietf-rtgwg-yang-vrrp-06.txt >
	Network Working Group X. Liu, Ed.		Network Working Group X. Liu, Ed.
	Internet-Draft A. Kyparlis		Internet-Draft A. Kyparlis
	Intended status: Standards Track Jabil		Intended status: Standards Track Jabil
	Expires: April 3, 2018 R. Parikh		Expires: April 29, 2018 R. Parikh
	VMware		VMware
	A. Lindem		A. Lindem
	Cisco Systems		Cisco Systems
	M. Zhang		M. Zhang
	Huawei Technologies		Huawei Technologies
	September 30, 2017		October 26, 2017
	A YANG Data Model for Virtual Router Redundancy Protocol (VRRP)		A YANG Data Model for Virtual Router Redundancy Protocol (VRRP)
	draft-ietf-rtgwg-yang-vrrp-05		draft-ietf-rtgwg-yang-vrrp-06
	Abstract		Abstract
	This document describes a data model for Virtual Router Redundancy		This document describes a data model for Virtual Router Redundancy
	Protocol (VRRP). Both version 2 and version 3 of VRRP are covered.		Protocol (VRRP). Both version 2 and version 3 of VRRP are covered.
	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.
	skipping to change at page 1, line 37 ¶		skipping to change at page 1, line 37 ¶
	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 http://datatracker.ietf.org/drafts/current/.		Drafts is at http://datatracker.ietf.org/drafts/current/.
	Internet-Drafts are draft documents valid for a maximum of six months		Internet-Drafts are draft documents valid for a maximum of six months
	and may be updated, replaced, or obsoleted by other documents at any		and may be updated, replaced, or obsoleted by other documents at any
	time. It is inappropriate to use Internet-Drafts as reference		time. It is inappropriate to use Internet-Drafts as reference
	material or to cite them other than as "work in progress."		material or to cite them other than as "work in progress."
	This Internet-Draft will expire on April 3, 2018.		This Internet-Draft will expire on April 29, 2018.
	Copyright Notice		Copyright Notice
	Copyright (c) 2017 IETF Trust and the persons identified as the		Copyright (c) 2017 IETF Trust and the persons identified as the
	document authors. All rights reserved.		document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		This document is subject to BCP 78 and the IETF Trust's Legal
	Provisions Relating to IETF Documents		Provisions Relating to IETF Documents
	(http://trustee.ietf.org/license-info) in effect on the date of		(http://trustee.ietf.org/license-info) in effect on the date of
	publication of this document. Please review these documents		publication of this document. Please review these documents
	skipping to change at page 2, line 28 ¶		skipping to change at page 2, line 28 ¶
	2.4. Protocol States . . . . . . . . . . . . . . . . . . . . . 7		2.4. Protocol States . . . . . . . . . . . . . . . . . . . . . 7
	2.5. Notifications . . . . . . . . . . . . . . . . . . . . . . 8		2.5. Notifications . . . . . . . . . . . . . . . . . . . . . . 8
	3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 10		3. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 10
	4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 31		4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 31
	5. Security Considerations . . . . . . . . . . . . . . . . . . . 31		5. Security Considerations . . . . . . . . . . . . . . . . . . . 31
	6. References . . . . . . . . . . . . . . . . . . . . . . . . . 32		6. References . . . . . . . . . . . . . . . . . . . . . . . . . 32
	6.1. Normative References . . . . . . . . . . . . . . . . . . 32		6.1. Normative References . . . . . . . . . . . . . . . . . . 32
	6.2. Informative References . . . . . . . . . . . . . . . . . 33		6.2. Informative References . . . . . . . . . . . . . . . . . 33
	Appendix A. Complete Model Tree Structure . . . . . . . . . . . 35		Appendix A. Complete Model Tree Structure . . . . . . . . . . . 35
	Appendix B. Data Tree Example . . . . . . . . . . . . . . . . . 37		Appendix B. Data Tree Example . . . . . . . . . . . . . . . . . 37
	Appendix C. YANG Model for Non-NMDA Compliant Implementations . 41		Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 41
	C.1. Non-NMDA YANG Module . . . . . . . . . . . . . . . . . . 41
	C.2. Non-NMDA Model Tree Structure . . . . . . . . . . . . . . 64
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 67
	1. Introduction		1. Introduction
	This document introduces a YANG [RFC6020][RFC7950] data model for		This document introduces a YANG [RFC6020][RFC7950] data model for
	Virtual Router Redundancy Protocol (VRRP) [RFC3768][RFC5798]. VRRP		Virtual Router Redundancy Protocol (VRRP) [RFC3768][RFC5798]. VRRP
	provides higher resiliency by specifying an election protocol that		provides higher resiliency by specifying an election protocol that
	dynamically assigns responsibility for a virtual router to one of the		dynamically assigns responsibility for a virtual router to one of the
	VRRP routers on a LAN.		VRRP routers on a LAN.
	This YANG model supports both version 2 and version 3 of VRRP. VRRP		This YANG model supports both version 2 and version 3 of VRRP. VRRP
	skipping to change at page 7, line 28 ¶		skipping to change at page 7, line 28 ¶
	+--rw vrrp-instance* [vrid]		+--rw vrrp-instance* [vrid]
	+--rw vrid uint8		+--rw vrid uint8
	| ...		| ...
	+--rw track		+--rw track
	| +--rw interfaces		| +--rw interfaces
	| | +--rw interface* [interface]		| | +--rw interface* [interface]
	| | +--rw interface if:interface-ref		| | +--rw interface if:interface-ref
	| | ...		| | ...
	| +--rw networks		| +--rw networks
	| +--rw network* [prefix]		| +--rw network* [prefix]
	| +--wo prefix inet:ipv4-prefix		| +--rw prefix inet:ipv4-prefix
	| ...		| ...
	+--rw virtual-ipv4-addresses		+--rw virtual-ipv4-addresses
	| +--rw virtual-ipv4-address* [ipv4-address]		| +--rw virtual-ipv4-address* [ipv4-address]
	| +--rw ipv4-address inet:ipv4-address		| +--rw ipv4-address inet:ipv4-address
	|		|
	+--ro <per instance operational states>		+--ro <per instance operational states>
	+--ro statistics		+--ro statistics
	+--ro <per instance statistics>		+--ro <per instance statistics>
	augment /if:interfaces/if:interface/ip:ipv6:		augment /if:interfaces/if:interface/ip:ipv6:
	skipping to change at page 10, line 7 ¶		skipping to change at page 10, line 7 ¶
	o Subscribe notifications on a per client basis.		o Subscribe notifications on a per client basis.
	o Specify subtree filters or xpath filters so that only interested		o Specify subtree filters or xpath filters so that only interested
	contents will be sent.		contents will be sent.
	o Specify either periodic or on-demand notifications.		o Specify either periodic or on-demand notifications.
	3. YANG Module		3. YANG Module
	<CODE BEGINS> file "ietf-vrrp@2017-09-25.yang"		<CODE BEGINS> file "ietf-vrrp@2017-10-25.yang"
	module ietf-vrrp {		module ietf-vrrp {
	yang-version 1.1;		yang-version 1.1;
	namespace "urn:ietf:params:xml:ns:yang:ietf-vrrp";		namespace "urn:ietf:params:xml:ns:yang:ietf-vrrp";
	prefix "vrrp";		prefix "vrrp";
	import ietf-inet-types {		import ietf-inet-types {
	prefix "inet";		prefix "inet";
	}		}
	import ietf-yang-types {		import ietf-yang-types {
	skipping to change at page 11, line 12 ¶		skipping to change at page 11, line 12 ¶
	Editor: Acee Lindem		Editor: Acee Lindem
	<mailto:acee@cisco.com>		<mailto:acee@cisco.com>
	Editor: Mingui Zhang		Editor: Mingui Zhang
	<mailto:zhangmingui@huawei.com>";		<mailto:zhangmingui@huawei.com>";
	description		description
	"This YANG module defines a model for managing Virtual Router		"This YANG module defines a model for managing Virtual Router
	Redundancy Protocol (VRRP) version 2 and version 3.";		Redundancy Protocol (VRRP) version 2 and version 3.";
	revision 2017-09-25 {		revision 2017-10-25 {
	description "Initial revision";		description "Initial revision";
	reference		reference
	"RFC XXXX: A YANG Data Model for Virtual Router Redundancy		"RFC XXXX: A YANG Data Model for Virtual Router Redundancy
	Protocol (VRRP).		Protocol (VRRP).
	RFC 2787: Definitions of Managed Objects for the Virtual		RFC 2787: Definitions of Managed Objects for the Virtual
	Router Redundancy Protocol.		Router Redundancy Protocol.
	RFC 3768: Virtual Router Redundancy Protocol (VRRP).		RFC 3768: Virtual Router Redundancy Protocol (VRRP).
	RFC 5798: Virtual Router Redundancy Protocol (VRRP) Version 3.		RFC 5798: Virtual Router Redundancy Protocol (VRRP) Version 3.
	RFC 6527: Definitions of Managed Objects for the Virtual		RFC 6527: Definitions of Managed Objects for the Virtual
	Router Redundancy Protocol Version 3 (VRRPv3).";		Router Redundancy Protocol Version 3 (VRRPv3).";
	skipping to change at page 26, line 38 ¶		skipping to change at page 26, line 38 ¶
	}		}
	} // container statistics		} // container statistics
	} // grouping vrrp-state-attributes		} // grouping vrrp-state-attributes
	grouping vrrp-global-state-attributes {		grouping vrrp-global-state-attributes {
	description		description
	"Group of VRRP global state attributes.";		"Group of VRRP global state attributes.";
	leaf virtual-routers {		leaf virtual-routers {
	type uint32;		type uint32;
	config false;
	description "Number of configured virtual routers.";		description "Number of configured virtual routers.";
	}		}
	leaf interfaces {		leaf interfaces {
	type uint32;		type uint32;
	config false;
	description "Number of interface with VRRP configured.";		description "Number of interface with VRRP configured.";
	}		}
	container statistics {		container statistics {
	config false;
	description		description
	"VRRP global statistics.";		"VRRP global statistics.";
	leaf discontinuity-datetime {		leaf discontinuity-datetime {
	type yang:date-and-time;		type yang:date-and-time;
	description		description
	"The time on the most recent occasion at which one of		"The time on the most recent occasion at which one of
	checksum-errors, version-errors, vrid-errors, and		checksum-errors, version-errors, vrid-errors, and
	ip-ttl-errors suffered a discontinuity.		ip-ttl-errors suffered a discontinuity.
	skipping to change at page 29, line 4 ¶		skipping to change at page 28, line 49 ¶
	key "vrid";		key "vrid";
	description		description
	"Defines a virtual router, identified by a virtual router		"Defines a virtual router, identified by a virtual router
	identifier (VRID), within IPv6 address space.";		identifier (VRID), within IPv6 address space.";
	uses vrrp-ipv6-attributes;		uses vrrp-ipv6-attributes;
	uses vrrp-state-attributes;		uses vrrp-state-attributes;
	} // list vrrp-instance		} // list vrrp-instance
	} // container vrrp		} // container vrrp
	} // augment ipv6		} // augment ipv6
	container vrrp {		container vrrp {
			config false;
	description "VRRP data at the global level.";		description "VRRP data at the global level.";
	uses vrrp-global-state-attributes;		uses vrrp-global-state-attributes;
	}		}
	/*		/*
	* Notifications		* Notifications
	*/		*/
	notification vrrp-new-master-event {		notification vrrp-new-master-event {
	skipping to change at page 33, line 26 ¶		skipping to change at page 33, line 26 ¶
	progress), August 2017.		progress), August 2017.
	[I-D.bjorklund-netmod-rfc7277bis]		[I-D.bjorklund-netmod-rfc7277bis]
	Bjorklund, M., "A YANG Data Model for IP Management",		Bjorklund, M., "A YANG Data Model for IP Management",
	draft-bjorklund-netmod-rfc7277bis-00 (work in progress),		draft-bjorklund-netmod-rfc7277bis-00 (work in progress),
	August 2017.		August 2017.
	[I-D.ietf-netmod-revised-datastores]		[I-D.ietf-netmod-revised-datastores]
	Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,		Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K.,
	and R. Wilton, "Network Management Datastore		and R. Wilton, "Network Management Datastore
	Architecture", draft-ietf-netmod-revised-datastores-04		Architecture", draft-ietf-netmod-revised-datastores-05
	(work in progress), August 2017.		(work in progress), October 2017.
	6.2. Informative References		6.2. Informative References
	[RFC3768] Hinden, R., Ed., "Virtual Router Redundancy Protocol		[RFC3768] Hinden, R., Ed., "Virtual Router Redundancy Protocol
	(VRRP)", RFC 3768, DOI 10.17487/RFC3768, April 2004,		(VRRP)", RFC 3768, DOI 10.17487/RFC3768, April 2004,
	<https://www.rfc-editor.org/info/rfc3768>.		<https://www.rfc-editor.org/info/rfc3768>.
	[RFC6536] Bierman, A. and M. Bjorklund, "Network Configuration		[RFC6536] Bierman, A. and M. Bjorklund, "Network Configuration
	Protocol (NETCONF) Access Control Model", RFC 6536,		Protocol (NETCONF) Access Control Model", RFC 6536,
	DOI 10.17487/RFC6536, March 2012, <https://www.rfc-		DOI 10.17487/RFC6536, March 2012, <https://www.rfc-
	skipping to change at page 34, line 9 ¶		skipping to change at page 34, line 9 ¶
	[I-D.ietf-netconf-rfc5277bis]		[I-D.ietf-netconf-rfc5277bis]
	Clemm, A., Prieto, A., Voit, E., Nilsen-Nygaard, E.,		Clemm, A., Prieto, A., Voit, E., Nilsen-Nygaard, E.,
	Tripathy, A., Chisholm, S., and H. Trevino, "Subscribing		Tripathy, A., Chisholm, S., and H. Trevino, "Subscribing
	to Event Notifications", draft-ietf-netconf-rfc5277bis-01		to Event Notifications", draft-ietf-netconf-rfc5277bis-01
	(work in progress), October 2016.		(work in progress), October 2016.
	[I-D.ietf-netconf-yang-push]		[I-D.ietf-netconf-yang-push]
	Clemm, A., Voit, E., Prieto, A., Tripathy, A., Nilsen-		Clemm, A., Voit, E., Prieto, A., Tripathy, A., Nilsen-
	Nygaard, E., Bierman, A., and B. Lengyel, "Subscribing to		Nygaard, E., Bierman, A., and B. Lengyel, "Subscribing to
	YANG datastore push updates", draft-ietf-netconf-yang-		YANG datastore push updates", draft-ietf-netconf-yang-
	push-09 (work in progress), September 2017.		push-10 (work in progress), October 2017.
	[I-D.ietf-netmod-rfc6087bis]		[I-D.ietf-netmod-rfc6087bis]
	Bierman, A., "Guidelines for Authors and Reviewers of YANG		Bierman, A., "Guidelines for Authors and Reviewers of YANG
	Data Model Documents", draft-ietf-netmod-rfc6087bis-14		Data Model Documents", draft-ietf-netmod-rfc6087bis-14
	(work in progress), September 2017.		(work in progress), September 2017.
	Appendix A. Complete Model Tree Structure		Appendix A. Complete Model Tree Structure
	The VRRP YANG data model defined in this document has the following		The VRRP YANG data model defined in this document has the following
	tree structure:		tree structure:
	module: ietf-vrrp		module: ietf-vrrp
	+--rw vrrp		+--ro vrrp
	+--ro virtual-routers? uint32		+--ro virtual-routers? uint32
	+--ro interfaces? uint32		+--ro interfaces? uint32
	+--ro statistics		+--ro statistics
	+--ro discontinuity-datetime? yang:date-and-time		+--ro discontinuity-datetime? yang:date-and-time
	+--ro checksum-errors? yang:counter64		+--ro checksum-errors? yang:counter64
	+--ro version-errors? yang:counter64		+--ro version-errors? yang:counter64
	+--ro vrid-errors? yang:counter64		+--ro vrid-errors? yang:counter64
	+--ro ip-ttl-errors? yang:counter64		+--ro ip-ttl-errors? yang:counter64
	augment /if:interfaces/if:interface/ip:ipv4:		augment /if:interfaces/if:interface/ip:ipv4:
	+--rw vrrp		+--rw vrrp
	skipping to change at page 41, line 30 ¶		skipping to change at page 41, line 30 ¶
	"statistics": {		"statistics": {
	"discontinuity-datetime": "2016-10-24T17:11:27+02:00",		"discontinuity-datetime": "2016-10-24T17:11:27+02:00",
	"checksum-errors": 2,		"checksum-errors": 2,
	"version-errors": 0,		"version-errors": 0,
	"vrid-errors": 0,		"vrid-errors": 0,
	"ip-ttl-errors": 1		"ip-ttl-errors": 1
	}		}
	}		}
	}		}
	Appendix C. YANG Model for Non-NMDA Compliant Implementations
	The YANG data model defined so far in this document is designed to be
	used in conjunction with implementations that support the Network
	Management Datastore Architecture (NMDA) defined in
	[I-D.ietf-netmod-revised-datastores]. However, currently there are
	existing implementations that are not NMDA compliant. In order for
	such implementations to be used temporarily until NMDA
	implementations are available, this section describes the following
	non-NMDA version of the equivalent model.
	C.1. Non-NMDA YANG Module
	<CODE BEGINS> file "ietf-vrrp@2017-09-22.yang"
	module ietf-vrrp {
	yang-version 1.1;
	namespace "urn:ietf:params:xml:ns:yang:ietf-vrrp";
	prefix "vrrp";
	import ietf-inet-types {
	prefix "inet";
	}
	import ietf-yang-types {
	prefix "yang";
	}
	import ietf-interfaces {
	prefix "if";
	}
	import ietf-ip {
	prefix "ip";
	}
	organization
	"IETF Routing Area Working Group (RTGWG)";
	contact
	"WG Web: <https://datatracker.ietf.org/wg/rtgwg/>
	WG List: <mailto:rtgwg@ietf.org>
	WG Chair: Jeff Tantsura
	<mailto:jefftant.ietf@gmail.com>
	WG Chair: Chris Bowers
	<mailto:cbowers@juniper.net>
	Editor: Xufeng Liu
	<mailto:Xufeng_Liu@jabil.com>
	Editor: Athanasios Kyparlis
	<mailto:Athanasios_Kyparlis@jabil.com>
	Editor: Ravi Parikh
	<mailto:parikhr@vmware.com>
	Editor: Acee Lindem
	<mailto:acee@cisco.com>
	Editor: Mingui Zhang
	<mailto:zhangmingui@huawei.com>";
	description
	"This YANG module defines a model for managing Virtual Router
	Redundancy Protocol (VRRP) version 2 and version 3.";
	revision 2017-09-22 {
	description "Initial revision";
	reference
	"RFC XXXX: A YANG Data Model for Virtual Router Redundancy
	Protocol (VRRP).
	RFC 2787: Definitions of Managed Objects for the Virtual
	Router Redundancy Protocol.
	RFC 3768: Virtual Router Redundancy Protocol (VRRP).
	RFC 5798: Virtual Router Redundancy Protocol (VRRP) Version 3.
	RFC 6527: Definitions of Managed Objects for the Virtual
	Router Redundancy Protocol Version 3 (VRRPv3).";
	}
	/*
	* Features
	*/
	feature validate-interval-errors {
	description
	"This feature indicates that the system validates that
	the advertisement interval from advertisement packets
	received is the same as the one configured for the local
	VRRP router.";
	}
	feature validate-address-list-errors {
	description
	"This feature indicates that the system validates that
	the address list from received packets matches the
	locally configured list for the VRRP router.";
	}
	/*
	* Typedefs
	*/
	typedef new-master-reason-type {
	type enumeration {
	enum not-master {
	description
	"The virtual router has never transitioned to master
	state,";
	}
	enum priority {
	description "Priority was higher.";
	}
	enum preempted {
	description "The master was preempted.";
	}
	enum no-response {
	description "Previous master did not respond.";
	}
	}
	description
	"The reason for the virtual router to transition to master
	state.";
	} // new-master-reason-type
	/*
	* Identities
	*/
	/* vrrp-event-type identity and its derivatives. */
	identity vrrp-event-type {
	description
	"The type to indicate the type of a VRRP protocol event.";
	}
	identity vrrp-event-none {
	base vrrp-event-type;
	description
	"Indicates a non-meaningful event.";
	}
	identity vrrp-event-startup {
	base vrrp-event-type;
	description
	"Indicates that a VRRP router has initiated the protocol.";
	}
	identity vrrp-event-shutdown {
	base vrrp-event-type;
	description
	"Indicates that a VRRP router has closed down the protocol.";
	}
	identity vrrp-event-higher-priority-backup {
	base vrrp-event-type;
	description
	"Indicates that a backup router has a higher priority than
	the current master.";
	}
	identity vrrp-event-master-timeout {
	base vrrp-event-type;
	description
	"Indicates that the current master has not sent an
	advertisement within the limit of master-down-interval.";
	}
	identity vrrp-event-interface-up {
	base vrrp-event-type;
	description
	"Indicates that the VRRP enabled interface has become
	operational up.";
	}
	identity vrrp-event-interface-down {
	base vrrp-event-type;
	description
	"Indicates that the VRRP enabled interface has become
	operational down.";
	}
	identity vrrp-event-no-primary-ip-address {
	base vrrp-event-type;
	description
	"Indicates that the primary IP address on the VRRP enabled
	interface has become unavailable.";
	}
	identity vrrp-event-primary-ip-address {
	base vrrp-event-type;
	description
	"Indicates that the primary IP address on the VRRP enabled
	interface has become available.";
	}
	identity vrrp-event-no-virtual-ip-addresses {
	base vrrp-event-type;
	description
	"Indicates that there are no virtual IP addresses on the
	virtual router.";
	}
	identity vrrp-event-virtual-ip-addresses {
	base vrrp-event-type;
	description
	"Indicates that there are virtual IP addresses on the
	virtual router.";
	}
	identity vrrp-event-preempt-hold-timeout {
	base vrrp-event-type;
	description
	"Indicates that the configured preemption hold time has
	passed.";
	}
	identity vrrp-event-lower-priority-master {
	base vrrp-event-type;
	description
	"Indicates that there is a lower priority VRRP master.";
	}
	identity vrrp-event-owner-preempt {
	base vrrp-event-type;
	description
	"Indicates that the owner has preempted another router to
	become the master.";
	}
	/* vrrp-error-global identity and its derivatives. */
	identity vrrp-error-global {
	description
	"The type to indicate the type of a VRRP error that occurs
	for a packet before it reaches a VRRP router.";
	}
	identity checksum-error {
	base vrrp-error-global;
	description
	"A packet has been received with an invalid VRRP checksum
	value.";
	}
	identity ip-ttl-error {
	base vrrp-error-global;
	description
	"A packet has been received with IP TTL (Time-To-Live)
	not equal to 255.";
	}
	identity version-error {
	base vrrp-error-global;
	description
	"A packet has been received with an unknown or unsupported
	version number.";
	}
	identity vrid-error {
	base vrrp-error-global;
	description
	"A packet has been received with a VRID that is not valid
	for any virtual router on this router.";
	}
	/* vrrp-error-virtual-router identity and its derivatives. */
	identity vrrp-error-virtual-router {
	description
	"The type to indicate the type of a VRRP error that occurs
	after a packet reaches a VRRP router.";
	}
	identity address-list-error {
	base vrrp-error-virtual-router;
	description
	"A packet has been received with an address list that
	does not match the locally configured address list for
	the virtual router.";
	}
	identity interval-error {
	base vrrp-error-virtual-router;
	description
	"A packet has been received with an advertisement
	interval different than the one configured for the local
	virtual router";
	}
	identity packet-length-error {
	base vrrp-error-virtual-router;
	description
	"A packet has been received with a packet length less
	than the length of the VRRP header.";
	}
	/* vrrp-state-type identity and its derivatives. */
	identity vrrp-state-type {
	description
	"The type to indicate the state of a virtual router.";
	}
	identity initialize {
	base vrrp-state-type;
	description
	"Indicates that the virtual router is waiting
	for a startup event.";
	}
	identity backup {
	base vrrp-state-type;
	description
	"Indicates that the virtual router is monitoring the
	availability of the master router.";
	}
	identity master {
	base vrrp-state-type;
	description
	"Indicates that the virtual router is forwarding
	packets for IP addresses that are associated with
	this virtual router.";
	}
	/* vrrp-version identity and its derivatives. */
	identity vrrp-version {
	description
	"The version of the VRRP protocol.";
	}
	identity vrrp-v2 {
	base vrrp-version;
	description
	"Indicates version 2 of the VRRP protocol.";
	}
	identity vrrp-v3 {
	base vrrp-version;
	description
	"Indicates version 3 of the VRRP protocol.";
	}
	/*
	* Groupings
	*/
	grouping vrrp-common-attributes {
	description
	"Group of VRRP attributes common to version 2 and version 3";
	leaf vrid {
	type uint8 {
	range 1..255;
	}
	description "Virtual router ID.";
	}
	leaf version {
	type identityref {
	base vrrp:vrrp-version;
	}
	mandatory true;
	description "Version 2 or version 3 of VRRP.";
	}
	leaf log-state-change {
	type boolean;
	default "false";
	description
	"Generates VRRP state change messages each time the VRRP
	instance changes state (from up to down or down to up).";
	}
	container preempt {
	description
	"Enables a higher priority Virtual Router Redundancy
	Protocol (VRRP) backup router to preempt a lower priority
	VRRP master.";
	leaf enabled {
	type boolean;
	default "true";
	description
	"'true' if preemption is enabled.";
	}
	leaf hold-time {
	type uint16;
	units seconds;
	default 0;
	description
	"Hold time, in seconds, for which a higher priority VRRP
	backup router must wait before preempting a lower priority
	VRRP master.";
	}
	}
	leaf priority {
	type uint8 {
	range 1..254;
	}
	default 100;
	description
	"Configures the Virtual Router Redundancy Protocol (VRRP)
	election priority for the backup virtual router.";
	}
	leaf accept-mode {
	when "derived-from-or-self(current()/../version, 'vrrp-v3')" {
	description "Applicable only to version 3.";
	}
	type boolean;
	default "false";
	description
	"Controls whether a virtual router in Master state will
	accept packets addressed to the address owner's IPvX address
	as its own if it is not the IPvX address owner. The default
	is false. Deployments that rely on, for example, pinging the
	address owner's IPvX address may wish to configure
	accept-mode to true.
	Note: IPv6 Neighbor Solicitations and Neighbor
	Advertisements MUST NOT be dropped when accept-mode is
	false.";
	}
	} // vrrp-common-attributes
	grouping vrrp-ipv4-attributes {
	description
	"Group of VRRP attributes for IPv4.";
	uses vrrp-common-attributes;
	choice advertise-interval-choice {
	description
	"The options for the advertisement interval at which VRRPv2
	or VRRPv3 advertisements are sent from the specified
	interface.";
	case v2 {
	when "derived-from-or-self(version, 'vrrp-v2')" {
	description "Applicable only to version 2.";
	}
	leaf advertise-interval-sec {
	type uint8 {
	range 1..254;
	}
	units seconds;
	default 1;
	description
	"Configures the interval that Virtual Router
	Redundancy Protocol Version 2 (VRRPv2) advertisements
	are sent from the specified interface.";
	}
	}
	case v3 {
	when "derived-from-or-self(version, 'vrrp-v3')" {
	description "Applicable only to version 3.";
	}
	leaf advertise-interval-centi-sec {
	type uint16 {
	range 1..4095;
	}
	units centiseconds;
	default 100;
	description
	"Configures the interval that Virtual Router
	Redundancy Protocol version 3 (VRRPv3) advertisements
	are sent from the specified interface.";
	}
	}
	} // advertise-interval-choice
	container track {
	description
	"Enables the specified VRRP instance to track interfaces
	or networks.";
	container interfaces {
	description
	"Enables the specified Virtual Router Redundancy Protocol
	version 2 (VRRP) or version 3 (VRRPv3) instance to track
	an interface.";
	list interface {
	key "interface";
	description
	"Interface to track.";
	leaf interface {
	type if:interface-ref;
	must "/if:interfaces/if:interface[if:name=current()]/"
	+ "ip:ipv4" {
	description "Interface is IPv4.";
	}
	description
	"Interface to track.";
	}
	leaf priority-decrement {
	type uint8 {
	range 1..254;
	}
	default 10;
	description
	"Specifies how much to decrement the priority of the
	VRRP instance if the interface goes down.";
	}
	} // interface
	} // interfaces
	container networks {
	description
	"Enables the backup Virtual Router Redundancy Protocol
	version 2 (VRRP) or version 3 (VRRPv3) router to track a
	specified network through the IP network prefix of that
	network.";
	list network {
	key "prefix";
	description
	"Enables the specified Virtual Router Redundancy
	Protocol version 2 (VRRP) or version 3 (VRRPv3)
	instance to track an IP network, by specifying the
	prefix of the IP network.";
	leaf prefix {
	type inet:ipv4-prefix;
	description
	"The prefix of the network to track.";
	}
	leaf priority-decrement {
	type uint8 {
	range 1..254;
	}
	default 10;
	description
	"Specifies how much to decrement the priority of the
	backup VRRP router if there is a failure in the IP
	network.";
	}
	} // track-network
	} // track-networks
	} // track
	container virtual-ipv4-addresses {
	description
	"Configures the virtual IP address for the Virtual Router
	Redundancy Protocol (VRRP) interface.";
	list virtual-ipv4-address {
	key "ipv4-address";
	max-elements 16;
	description
	"Virtual IP addresses for a single VRRP instance. For a
	VRRP owner router, the virtual address must match one
	of the IP addresses configured on the interface
	corresponding to the virtual router.";
	leaf ipv4-address {
	type inet:ipv4-address;
	description
	"An IPv4 address associated with a virtual router.";
	reference
	"RFC 5798: Virtual Router Redundancy Protocol (VRRP)
	Version 3. Section 1.2.";
	}
	} // virtual-ipv4-address
	} // virtual-ipv4-addresses
	} // grouping vrrp-ipv4-attributes
	grouping vrrp-ipv6-attributes {
	description
	"Group of VRRP attributes for IPv6.";
	uses vrrp-common-attributes;
	leaf advertise-interval-centi-sec {
	type uint16 {
	range 1..4095;
	}
	units centiseconds;
	default 100;
	description
	"Configures the interval that Virtual Router
	Redundancy Protocol version 3 (VRRPv3) advertisements
	are sent from the specified interface.";
	}
	container track {
	description
	"Enables the specified VRRP instance to track interfaces
	or networks.";
	container interfaces {
	description
	"Enables the specified Virtual Router Redundancy Protocol
	version 2 (VRRP) or version 3 (VRRPv3) instance to track
	an interface.";
	list interface {
	key "interface";
	description
	"Interface to track.";
	leaf interface {
	type if:interface-ref;
	must "/if:interfaces/if:interface[if:name=current()]/"
	+ "ip:ipv6" {
	description "Interface is IPv6.";
	}
	description
	"Interface to track.";
	}
	leaf priority-decrement {
	type uint8 {
	range 1..254;
	}
	default 10;
	description
	"Specifies how much to decrement the priority of the
	VRRP instance if the interface goes down.";
	}
	} // interface
	} // interfaces
	container networks {
	description
	"Enables the backup Virtual Router Redundancy Protocol
	version 2 (VRRP) or version 3 (VRRPv3) router to track a
	specified network through the IP network prefix of that
	network.";
	list network {
	key "prefix";
	description
	"Enables the specified Virtual Router Redundancy
	Protocol version 2 (VRRP) or version 3 (VRRPv3)
	instance to track an IP network, by specifying the
	prefix of the IP network.";
	leaf prefix {
	type inet:ipv6-prefix;
	description
	"The prefix of the network to track.";
	}
	leaf priority-decrement {
	type uint8 {
	range 1..254;
	}
	default 10;
	description
	"Specifies how much to decrement the priority of the
	backup VRRP router if there is a failure in the IP
	network.";
	}
	} // track-network
	} // track-networks
	} // track
	container virtual-ipv6-addresses {
	description
	"Configures the virtual IP address for the Virtual Router
	Redundancy Protocol (VRRP) interface.";
	list virtual-ipv6-address {
	key "ipv6-address";
	max-elements 2;
	description
	"Two IPv6 addresses are allowed. The first one must be
	a link-local address and the second one can be a
	link-local or global address.";
	leaf ipv6-address {
	type inet:ipv6-address;
	description
	"An IPv6 address associated with a virtual router.";
	reference
	"RFC 5798: Virtual Router Redundancy Protocol (VRRP)
	Version 3. Section 1.3.";
	}
	} // virtual-ipv6-address
	} // virtual-ipv6-addresses
	} // grouping vrrp-ipv6-attributes
	grouping vrrp-state-attributes {
	description
	"Group of VRRP state attributes.";
	leaf state {
	type identityref {
	base vrrp:vrrp-state-type;
	}
	description
	"Operational state.";
	}
	leaf is-owner {
	type boolean;
	description
	"Set to true if this virtual router is owner.";
	}
	leaf last-adv-source {
	type inet:ip-address;
	description
	"Last advertised IPv4/IPv6 source address";
	}
	leaf up-datetime {
	type yang:date-and-time;
	description
	"The date and time when this virtual router
	transitioned out of init state.";
	}
	leaf master-down-interval {
	type uint32;
	units centiseconds;
	description
	"Time interval for backup virtual router to declare
	Master down.";
	}
	leaf skew-time {
	type uint32;
	units microseconds;
	description
	"Calculated based on the priority and advertisement
	interval configuration command parameters. See RFC 3768.";
	}
	leaf last-event {
	type identityref {
	base vrrp:vrrp-event-type;
	}
	description
	"Last reported event.";
	}
	leaf new-master-reason {
	type new-master-reason-type;
	description
	"Indicates the reason for the virtual router to transition
	to master state.";
	}
	container statistics {
	description
	"VRRP statistics.";
	leaf discontinuity-datetime {
	type yang:date-and-time;
	description
	"The time on the most recent occasion at which any one or
	more of the VRRP statistic counters suffered a
	discontinuity. If no such discontinuities have occurred
	since the last re-initialization of the local management
	subsystem, then this node contains the time that the
	local management subsystem re-initialized itself.";
	}
	leaf master-transitions {
	type yang:counter32;
	description
	"The total number of times that this virtual router's
	state has transitioned to master";
	}
	leaf advertisement-recv {
	type yang:counter64;
	description
	"The total number of VRRP advertisements received by
	this virtual router.";
	}
	leaf advertisement-sent {
	type yang:counter64;
	description
	"The total number of VRRP advertisements sent by
	this virtual router.";
	}
	leaf interval-errors {
	if-feature validate-interval-errors;
	type yang:counter64;
	description
	"The total number of VRRP advertisement packets
	received with an advertisement interval
	different than the one configured for the local
	virtual router";
	}
	leaf priority-zero-pkts-rcvd {
	type yang:counter64;
	description
	"The total number of VRRP packets received by the
	virtual router with a priority of 0.";
	}
	leaf priority-zero-pkts-sent {
	type yang:counter64;
	description
	"The total number of VRRP packets sent by the
	virtual router with a priority of 0.";
	}
	leaf invalid-type-pkts-rcvd {
	type yang:counter64;
	description
	"The number of VRRP packets received by the virtual
	router with an invalid value in the 'type' field.";
	}
	leaf address-list-errors {
	if-feature validate-address-list-errors;
	type yang:counter64;
	description
	"The total number of packets received with an
	address list that does not match the locally
	configured address list for the virtual router.";
	}
	leaf packet-length-errors {
	type yang:counter64;
	description
	"The total number of packets received with a packet
	length less than the length of the VRRP header.";
	}
	} // container statistics
	} // grouping vrrp-state-attributes
	grouping vrrp-global-state-attributes {
	description
	"Group of VRRP global state attributes.";
	leaf virtual-routers {
	type uint32;
	description "Number of configured virtual routers.";
	}
	leaf interfaces {
	type uint32;
	description "Number of interface with VRRP configured.";
	}
	container statistics {
	description
	"VRRP global statistics.";
	leaf discontinuity-datetime {
	type yang:date-and-time;
	description
	"The time on the most recent occasion at which one of
	checksum-errors, version-errors, vrid-errors, and
	ip-ttl-errors suffered a discontinuity.
	If no such discontinuities have occurred since the last
	re-initialization of the local management subsystem,
	then this node contains the time that the local management
	subsystem re-initialized itself.";
	}
	leaf checksum-errors {
	type yang:counter64;
	description
	"The total number of VRRP packets received with an invalid
	VRRP checksum value.";
	reference "RFC 5798, Section 5.2.8";
	}
	leaf version-errors {
	type yang:counter64;
	description
	"The total number of VRRP packets received with an unknown
	or unsupported version number.";
	reference "RFC 5798, Section 5.2.1";
	}
	leaf vrid-errors {
	type yang:counter64;
	description
	"The total number of VRRP packets received with a VRID that
	is not valid for any virtual router on this router.";
	reference "RFC 5798, Section 5.2.3";
	}
	leaf ip-ttl-errors {
	type yang:counter64;
	description
	"The total number of VRRP packets received by the
	virtual router with IP TTL (Time-To-Live) not equal
	to 255.";
	reference "RFC 5798, Sections 5.1.1.3 and 5.1.2.3.";
	}
	} // statistics
	} // vrrp-global-state-attributes
	/*
	* Configuration data nodes
	*/
	augment "/if:interfaces/if:interface/ip:ipv4" {
	description "Augment IPv4 interface.";
	container vrrp {
	description
	"Configures the Virtual Router Redundancy Protocol (VRRP)
	version 2 or version 3 for IPv4.";
	list vrrp-instance {
	key "vrid";
	description
	"Defines a virtual router, identified by a virtual router
	identifier (VRID), within IPv4 address space.";
	uses vrrp-ipv4-attributes;
	}
	}
	} // augment ipv4
	augment "/if:interfaces/if:interface/ip:ipv6" {
	description "Augment IPv6 interface.";
	container vrrp {
	description
	"Configures the Virtual Router Redundancy Protocol (VRRP)
	version 3 for IPv6.";
	list vrrp-instance {
	must "derived-from-or-self(version, 'vrrp-v3')" {
	description
	"IPv6 is only supported by version 3.";
	}
	key "vrid";
	description
	"Defines a virtual router, identified by a virtual router
	identifier (VRID), within IPv6 address space.";
	uses vrrp-ipv6-attributes;
	} // list vrrp-instance
	} // container vrrp
	} // augment ipv6
	/*
	* Operational state data nodes
	*/
	augment "/if:interfaces-state/if:interface/ip:ipv4" {
	description "Augment IPv4 interface state.";
	container vrrp {
	description
	"State information for Virtual Router Redundancy Protocol
	(VRRP) version 2 for IPv4.";
	list vrrp-instance {
	key "vrid";
	description
	"States of a virtual router, identified by a virtual router
	identifier (VRID), within IPv4 address space.";
	uses vrrp-ipv4-attributes;
	uses vrrp-state-attributes;
	} // list vrrp-instance
	}
	}
	augment "/if:interfaces-state/if:interface/ip:ipv6" {
	description "Augment IPv6 interface state.";
	container vrrp {
	description
	"State information of the Virtual Router Redundancy Protocol
	(VRRP) version 2 or version 3 for IPv6.";
	list vrrp-instance {
	key "vrid";
	description
	"States of a virtual router, identified by a virtual router
	identifier (VRID), within IPv6 address space.";
	uses vrrp-ipv6-attributes;
	uses vrrp-state-attributes;
	} // list vrrp-instance
	}
	}
	augment "/if:interfaces-state" {
	description "Specify VRRP state data at the global level.";
	container vrrp-global {
	description
	"State information of the Virtual Router Redundancy Protocol
	(VRRP) at the global level";
	uses vrrp-global-state-attributes;
	}
	}
	/*
	* Notifications
	*/
	notification vrrp-new-master-event {
	description
	"Notification event for a change of VRRP new master.";
	leaf master-ip-address {
	type inet:ip-address;
	mandatory true;
	description
	"IPv4 or IPv6 address of the new master.";
	}
	leaf new-master-reason {
	type new-master-reason-type;
	mandatory true;
	description
	"Indicates the reason for the virtual router to transition
	to master state.";
	}
	}
	notification vrrp-protocol-error-event {
	description
	"Notification event for a VRRP protocol error.";
	leaf protocol-error-reason {
	type identityref {
	base vrrp:vrrp-error-global;
	}
	mandatory true;
	description
	"Indicates the reason for the protocol error.";
	}
	}
	notification vrrp-virtual-router-error-event {
	description
	"Notification event for an error happened on a virtual
	router.";
	leaf interface {
	type if:interface-ref;
	mandatory true;
	description
	"Indicates the interface for which statistics area
	to be cleared.";
	}
	choice ip-version {
	mandatory true;
	description
	"The error may have happened on either an IPv4 virtual
	router or an IPv6 virtual router. The information
	related to a specific IP version is provided by one of
	the following cases.";
	case ipv4 {
	description "IPv4";
	container ipv4 {
	description
	"Error information for IPv4.";
	leaf vrid {
	type leafref {
	path "/if:interfaces/if:interface"
	+ "[if:name = current()/../../vrrp:interface]/"
	+ "ip:ipv4/vrrp:vrrp/vrrp:vrrp-instance/vrrp:vrid";
	}
	mandatory true;
	description
	"Indicates the virtual router on which the event has
	occurred.";
	}
	}
	}
	case ipv6 {
	description "IPv6";
	container ipv6 {
	description
	"Error information for IPv6.";
	leaf vrid {
	type leafref {
	path "/if:interfaces/if:interface"
	+ "[if:name = current()/../../vrrp:interface]/"
	+ "ip:ipv6/vrrp:vrrp/vrrp:vrrp-instance/vrrp:vrid";
	}
	mandatory true;
	description
	"Indicates the virtual router on which the event has
	occurred.";
	}
	}
	}
	}
	leaf virtual-router-error-reason {
	type identityref {
	base vrrp:vrrp-error-virtual-router;
	}
	mandatory true;
	description
	"Indicates the reason for the virtual router error.";
	}
	}
	}
	<CODE ENDS>
	C.2. Non-NMDA Model Tree Structure
	module: ietf-vrrp
	augment /if:interfaces/if:interface/ip:ipv4:
	+--rw vrrp
	+--rw vrrp-instance* [vrid]
	+--rw vrid uint8
	+--rw version identityref
	+--rw log-state-change? boolean
	+--rw preempt
	| +--rw enabled? boolean
	| +--rw hold-time? uint16
	+--rw priority? uint8
	+--rw accept-mode? boolean
	+--rw (advertise-interval-choice)?
	| +--:(v2)
	| | +--rw advertise-interval-sec? uint8
	| +--:(v3)
	| +--rw advertise-interval-centi-sec? uint16
	+--rw track
	| +--rw interfaces
	| | +--rw interface* [interface]
	| | +--rw interface if:interface-ref
	| | +--rw priority-decrement? uint8
	| +--rw networks
	| +--rw network* [prefix]
	| +--rw prefix inet:ipv4-prefix
	| +--rw priority-decrement? uint8
	+--rw virtual-ipv4-addresses
	+--rw virtual-ipv4-address* [ipv4-address]
	+--rw ipv4-address inet:ipv4-address
	augment /if:interfaces/if:interface/ip:ipv6:
	+--rw vrrp
	+--rw vrrp-instance* [vrid]
	+--rw vrid uint8
	+--rw version identityref
	+--rw log-state-change? boolean
	+--rw preempt
	| +--rw enabled? boolean
	| +--rw hold-time? uint16
	+--rw priority? uint8
	+--rw accept-mode? boolean
	+--rw advertise-interval-centi-sec? uint16
	+--rw track
	| +--rw interfaces
	| | +--rw interface* [interface]
	| | +--rw interface if:interface-ref
	| | +--rw priority-decrement? uint8
	| +--rw networks
	| +--rw network* [prefix]
	| +--rw prefix inet:ipv6-prefix
	| +--rw priority-decrement? uint8
	+--rw virtual-ipv6-addresses
	+--rw virtual-ipv6-address* [ipv6-address]
	+--rw ipv6-address inet:ipv6-address
	augment /if:interfaces-state/if:interface/ip:ipv4:
	+--ro vrrp
	+--ro vrrp-instance* [vrid]
	+--ro vrid uint8
	+--ro version identityref
	+--ro log-state-change? boolean
	+--ro preempt
	| +--ro enabled? boolean
	| +--ro hold-time? uint16
	+--ro priority? uint8
	+--ro accept-mode? boolean
	+--ro (advertise-interval-choice)?
	| +--:(v2)
	| | +--ro advertise-interval-sec? uint8
	| +--:(v3)
	| +--ro advertise-interval-centi-sec? uint16
	+--ro track
	| +--ro interfaces
	| | +--ro interface* [interface]
	| | +--ro interface if:interface-ref
	| | +--ro priority-decrement? uint8
	| +--ro networks
	| +--ro network* [prefix]
	| +--ro prefix inet:ipv4-prefix
	| +--ro priority-decrement? uint8
	+--ro virtual-ipv4-addresses
	| +--ro virtual-ipv4-address* [ipv4-address]
	| +--ro ipv4-address inet:ipv4-address
	+--ro state? identityref
	+--ro is-owner? boolean
	+--ro last-adv-source? inet:ip-address
	+--ro up-datetime? yang:date-and-time
	+--ro master-down-interval? uint32
	+--ro skew-time? uint32
	+--ro last-event? identityref
	+--ro new-master-reason?
	new-master-reason-type
	+--ro statistics
	+--ro discontinuity-datetime? yang:date-and-time
	+--ro master-transitions? yang:counter32
	+--ro advertisement-recv? yang:counter64
	+--ro advertisement-sent? yang:counter64
	+--ro interval-errors? yang:counter64
	{validate-interval-errors}?
	+--ro priority-zero-pkts-rcvd? yang:counter64
	+--ro priority-zero-pkts-sent? yang:counter64
	+--ro invalid-type-pkts-rcvd? yang:counter64
	+--ro address-list-errors? yang:counter64
	{validate-address-list-errors}?
	+--ro packet-length-errors? yang:counter64
	augment /if:interfaces-state/if:interface/ip:ipv6:
	+--ro vrrp
	+--ro vrrp-instance* [vrid]
	+--ro vrid uint8
	+--ro version identityref
	+--ro log-state-change? boolean
	+--ro preempt
	| +--ro enabled? boolean
	| +--ro hold-time? uint16
	+--ro priority? uint8
	+--ro accept-mode? boolean
	+--ro advertise-interval-centi-sec? uint16
	+--ro track
	| +--ro interfaces
	| | +--ro interface* [interface]
	| | +--ro interface if:interface-ref
	| | +--ro priority-decrement? uint8
	| +--ro networks
	| +--ro network* [prefix]
	| +--ro prefix inet:ipv6-prefix
	| +--ro priority-decrement? uint8
	+--ro virtual-ipv6-addresses
	| +--ro virtual-ipv6-address* [ipv6-address]
	| +--ro ipv6-address inet:ipv6-address
	+--ro state? identityref
	+--ro is-owner? boolean
	+--ro last-adv-source? inet:ip-address
	+--ro up-datetime? yang:date-and-time
	+--ro master-down-interval? uint32
	+--ro skew-time? uint32
	+--ro last-event? identityref
	+--ro new-master-reason?
	new-master-reason-type
	+--ro statistics
	+--ro discontinuity-datetime? yang:date-and-time
	+--ro master-transitions? yang:counter32
	+--ro advertisement-recv? yang:counter64
	+--ro advertisement-sent? yang:counter64
	+--ro interval-errors? yang:counter64
	{validate-interval-errors}?
	+--ro priority-zero-pkts-rcvd? yang:counter64
	+--ro priority-zero-pkts-sent? yang:counter64
	+--ro invalid-type-pkts-rcvd? yang:counter64
	+--ro address-list-errors? yang:counter64
	{validate-address-list-errors}?
	+--ro packet-length-errors? yang:counter64
	augment /if:interfaces-state:
	+--ro vrrp-global
	+--ro virtual-routers? uint32
	+--ro interfaces? uint32
	+--ro statistics
	+--ro discontinuity-datetime? yang:date-and-time
	+--ro checksum-errors? yang:counter64
	+--ro version-errors? yang:counter64
	+--ro vrid-errors? yang:counter64
	+--ro ip-ttl-errors? yang:counter64
	notifications:
	+---n vrrp-new-master-event
	| +--ro master-ip-address inet:ip-address
	| +--ro new-master-reason new-master-reason-type
	+---n vrrp-protocol-error-event
	| +--ro protocol-error-reason identityref
	+---n vrrp-virtual-router-error-event
	+--ro interface if:interface-ref
	+--ro (ip-version)
	| +--:(ipv4)
	| | +--ro ipv4
	| | +--ro vrid -> /if:interfaces/interface[if:name =
	current()/../../vrrp:interface]/ip:ipv4/vrrp:vrrp/vrrp-instance/vrid
	| +--:(ipv6)
	| +--ro ipv6
	| +--ro vrid -> /if:interfaces/interface[if:name =
	current()/../../vrrp:interface]/ip:ipv6/vrrp:vrrp/vrrp-instance/vrid
	+--ro virtual-router-error-reason identityref
	Authors' Addresses		Authors' Addresses
	Xufeng Liu (editor)		Xufeng Liu (editor)
	Jabil		Jabil
	8281 Greensboro Drive, Suite 200		8281 Greensboro Drive, Suite 200
	McLean VA 22102		McLean VA 22102
	USA		USA
	EMail: Xufeng_Liu@jabil.com		EMail: Xufeng_Liu@jabil.com
	Athanasios Kyparlis		Athanasios Kyparlis
	Jabil		Jabil
	8281 Greensboro Drive, Suite 200		8281 Greensboro Drive, Suite 200
	McLean VA 22102		McLean VA 22102
	USA		USA
	EMail: Athanasios_Kyparlis@jabil.com		EMail: Athanasios_Kyparlis@jabil.com
	Ravi Parikh		Ravi Parikh
	VMware		VMware
	3425 Hillview Avenue		3425 Hillview Avenue
	Palo Alto CA 94304		Palo Alto CA 94304
	USA		USA
	EMail: parikhr@vmware.com		EMail: parikhr@vmware.com
	Acee Lindem		Acee Lindem
	Cisco Systems		Cisco Systems
End of changes. 19 change blocks.
	1275 lines changed or deleted		15 lines changed or added
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