draft-ietf-teas-yang-te-topo-00.txt		draft-ietf-teas-yang-te-topo-01.txt
	TEAS Working Group X. Liu		TEAS Working Group Xufeng Liu
	Internet-Draft Ericsson		Internet Draft Ericsson
	Intended status: Standards Track I. Bryskin		Intended status: Standards Track Igor Bryskin
	Expires: November 08, 2015 ADVA Optical Networking		ADVA Optical Networking
	V. Beeram		Vishnu Pavan Beeram
	Juniper Networks		Juniper Networks
	T. Saad		Tarek Saad
	Cisco Systems Inc.		Cisco Systems Inc
	H. Shah		Himanshu Shah
	Ciena		Ciena
	May 08, 2015		Oscar Gonzalez De Dios
			Telefonica
	YANG Data Model for TE Topologies		Expires: January 6, 2016 July 6, 2015
	draft-ietf-teas-yang-te-topo-00
	Abstract		YANG Data Model for TE Topologies
			draft-ietf-teas-yang-te-topo-01
	This document defines a YANG data model for representing and		Status of this Memo
	manipulating TE Topologies.
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	Copyright (c) 2015 IETF Trust and the persons identified as the		Copyright Notice
	document authors. All rights reserved.
	This document is subject to BCP 78 and the IETF Trust's Legal		Copyright (c) 2015 IETF Trust and the persons identified as the
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	Table of Contents		This document is subject to BCP 78 and the IETF Trust's Legal
			Provisions Relating to IETF Documents
			(http://trustee.ietf.org/license-info) in effect on the date of
			publication of this document. Please review these documents
			carefully, as they describe your rights and restrictions with
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			document must include Simplified BSD License text as described in
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			warranty as described in the Simplified BSD License.
	1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2		Abstract
	1.1. Tree Structure - Legend . . . . . . . . . . . . . . . . . 2
	1.2. Prefixes in Data Node Names . . . . . . . . . . . . . . . 3
	1.3. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
	2. Design Considerations . . . . . . . . . . . . . . . . . . . . 4
	2.1. Generic extensible Model . . . . . . . . . . . . . . . . 4
	2.1.1. Generic TE Link Attributes . . . . . . . . . . . . . 4
	2.1.2. Generic TE Node Attributes . . . . . . . . . . . . . 4
	2.1.3. TED Information Sources . . . . . . . . . . . . . . . 4
	2.2. Overlay/Underlay Relationship . . . . . . . . . . . . . . 5
	2.3. Scheduling Parameters . . . . . . . . . . . . . . . . . . 5
	2.4. Abstract TE Topologies . . . . . . . . . . . . . . . . . 5
	2.5. Open Items . . . . . . . . . . . . . . . . . . . . . . . 6
	3. Tree Structure . . . . . . . . . . . . . . . . . . . . . . . 6
	3.1. TE Topology Yang Module . . . . . . . . . . . . . . . . . 29
	4. Normative References . . . . . . . . . . . . . . . . . . . . 49
	Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 49
	1. Introduction		This document defines a YANG data model for representing, retrieving
			and manipulating TE Topologies. The model serves as a base model
			that other technology specific TE Topology models can augment.
	YANG [RFC6020] a data definition language that was introduced to		Conventions used in this document
	define the contents of a conceptual data store that allows networked
	devices to be managed using NETCONF [RFC6241]. YANG is proving
	relevant beyond its initial confines, as bindings to other interfaces
	(e.g. ReST) and encoding other than XML (e.g. JSON) are being
	defined. Furthermore, YANG data models can be used as the basis of
	implementation for other interface, such as CLI and programmatic
	APIs. This document defines a YANG data model for representing and
	manipulating TE Topologies. This model contains technology agnostic
	TE Topology building blocks that can be augmented and used by other
	technology-specific TE Topology models.
	1.1. Tree Structure - Legend		The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
			"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
			document are to be interpreted as described in RFC-2119 [RFC2119].
	A simplified graphical representation of the data model is presented		Table of Contents
	in Section 3 of this document. The following notations are used for
	the YANG model data tree representation.
	<status> <flags> <name> <opts> <type>		1. Introduction...................................................3
			1.1. Terminology...............................................3
			1.2. Tree Structure - Legend...................................4
			1.3. Prefixes in Data Node Names...............................4
			2. Characterizing TE Topologies...................................5
			3. Model Applicability............................................6
			3.1. Native TE Topologies......................................6
			3.2. Customized TE Topologies..................................8
			4. Modeling Considerations.......................................10
			4.1. Generic extensible Model.................................10
			4.2. Model Structure..........................................10
			4.3. Topology Identifiers.....................................11
			4.4. Generic TE Link Attributes...............................12
			4.5. Generic TE Node Attributes...............................12
			4.6. TED Information Sources..................................13
			4.7. Overlay/Underlay Relationship............................14
			4.8. Scheduling Parameters....................................15
			4.9. Templates................................................15
			4.10. Notifications...........................................16
			4.11. Open Items..............................................17
			5. Tree Structure................................................17
			6. TE Topology Yang Module.......................................42
			7. Security Considerations.......................................78
			8. IANA Considerations...........................................78
			9. References....................................................78
			9.1. Normative References.....................................78
			9.2. Informative References...................................79
			10. Acknowledgments..............................................79
	<status> is one of:		1. Introduction
	+ for current
	x for deprecated
	o for obsolete
	<flags> is one of:		The Traffic Engineering Database (TED) is an essential component of
	rw for read-write configuration data		Traffic Engineered (TE) systems that are based on MPLS-TE [RFC2702]
	ro for read-only non-configuration data		and GMPLS [RFC3945]. The TED is a collection of all TE information
	-x for execution rpcs		about all TE nodes and TE links in the network. The TE Topology is a
	-n for notifications		schematic arrangement of TE nodes and TE links present in a given
			TED. There could be one or more TE Topologies present in a given
			Traffic Engineered system. The TE Topology is the topology on which
			path computational algorithms are run to compute Traffic Engineered
			Paths (TE Paths).
	<name> is the name of the node		This document defines a YANG [RFC6020] data model for representing
			and manipulating TE Topologies. This model contains technology
			agnostic TE Topology building blocks that can be augmented and used
			by other technology-specific TE Topology models.
	If the node is augmented into the tree from another module, its name		1.1. Terminology
	is printed as <prefix>:<name>
	<opts> is one of:		TED: The Traffic Engineering Database is a collection of all TE
	? for an optional leaf or node		information about all TE nodes and TE links in a given network.
	! for a presence container
	* for a leaf-list or list
	Brackets [<keys>] for a list's keys
	Curly braces {<condition>} for optional feature that make node
	conditional
	Colon : for marking case nodes
	Ellipses ("...") subtree contents not shown
	Parentheses enclose choice and case nodes, and case nodes are		TE-Topology: The TE Topology is a schematic arrangement of TE nodes
	also marked with a colon (":").		and TE links in a given TED. It forms the basis for a graph suitable
			for TE path computations.
	<type> is the name of the type for leafs and leaf-lists.		Native TE Topology: Native TE Topology is a topology that is native
			to a given provider network. This is the topology on which path
			computational algorithms are run to compute TE Paths.
	1.2. Prefixes in Data Node Names		Customized TE Topology: Customized TE Topology is a custom topology
			that is produced by a provider for a given Client. This topology
			typically augments the Client's Native TE Topology. Path
			computational algorithms aren't typically run on the Customized TE
			Topology; they are run on the Client's augmented Native TE Topology.
	In this document, names of data nodes and other data model objects		1.2. Tree Structure - Legend
	are prefixed using the standard prefix associated with the
	corresponding YANG imported modules, as shown in Table 1.
	+--------+-----------------+-----------+		A simplified graphical representation of the data model is presented
	| Prefix | YANG module | Reference |		in Section 5 of this document. The following notations are used for
	+--------+-----------------+-----------+		the YANG model data tree representation.
	| yang | ietf-yang-types | [RFC6991] |
	| inet | ietf-inet-types | [RFC6991] |
	+--------+-----------------+-----------+
	Table 1: Prefixes and corresponding YANG modules		<status> <flags> <name> <opts> <type>
	1.3. Terminology		<status> is one of:
			+ for current
			x for deprecated
			o for obsolete
	In this document, the key words "MUST", "MUST NOT", "REQUIRED",		<flags> is one of:
	"SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY",		rw for read-write configuration data
	and "OPTIONAL" are to be interpreted as described in BCP 14, RFC 2119		ro for read-only non-configuration data
	[RFC2119].		-x for execution rpcs
			-n for notifications
	2. Design Considerations		<name> is the name of the node
	2.1. Generic extensible Model		If the node is augmented into the tree from another module,
			its name is printed as <prefix>:<name>
	The TE Topology model proposed in this document is meant to be		<opts> is one of:
	technology agnostic. Other technology specific TE Topology models		? for an optional leaf or node
	can augment and use the building blocks provided by the proposed		! for a presence container
	model.		* for a leaf-list or list
			Brackets [<keys>] for a list's keys
			Curly braces {<condition>} for optional feature that make
			node conditional
	2.1.1. Generic TE Link Attributes		Colon : for marking case nodes
			Ellipses ("...") subtree contents not shown
	The model covers the definitions for generic TE Link attributes -		Parentheses enclose choice and case nodes, and case nodes are
	bandwidth, admin groups, SRLGs, switching capabilities, TE metric		also marked with a colon (":").
	extensions etc.
	2.1.2. Generic TE Node Attributes		<type> is the name of the type for leafs and leaf-lists.
	The model covers the definitions for generic TE Node attributes like		1.3. Prefixes in Data Node Names
	connectivity matrix.
	+--rw connectivity-matrix* [id]		In this document, names of data nodes and other data model objects
	+--rw id uint32		are prefixed using the standard prefix associated with the
	+--rw from-link		corresponding YANG imported modules, as shown in Table 1.
	+--rw topo-ref? leafref
	+--rw node-ref? leafref
	+--rw link-end-ref? leafref
	+--rw to-link
	+--rw topo-ref? leafref
	+--rw node-ref? leafref
	+--rw link-end-ref? leafref
	+--rw is-allowed? Boolean
	2.1.3. TED Information Sources		+--------+-----------------+-----------+
			| Prefix | YANG module | Reference |
			+--------+-----------------+-----------+
			| yang | ietf-yang-types | [RFC6991] |
			| inet | ietf-inet-types | [RFC6991] |
			+--------+-----------------+-----------+
	The model allows each TE topological element to have multiple TE		Table 1: Prefixes and corresponding YANG modules
	information sources (OSPF-TE, ISIS-TE, BGP-LS, User-Configured,
	Other). Each information source is associated with a credibility
	preference to indicate precedence.
	The model captures overlay and underlay relationship for TE nodes/		2. Characterizing TE Topologies
	links. For example - in networks where multiple TE Topologies are
	built hierarchically, this model allows the user to start from a
	specific topological element in the top most topology and traverse
	all the way down to the supporting topological elements in the bottom
	most topology.
	2.2. Overlay/Underlay Relationship		The data model proposed by this document takes the following
			characteristics of TE Topologies into account:
	+--rw node* [te-node-id]		- TE Topology is an abstract control-plane representation of the
	:		data-plane topology. Hence attributes specific to the data-plane
	+--rw te-node-attributes		must make their way into the corresponding TE Topology modeling.
	:		The TE Topology comprises of dynamic auto-discovered data (data
	+--rw underlay-topology? leafref {te-topology-hierarchy}?		that may change frequently - example: unreserved bandwidth
			available on data-plane links) as well as fairly static data (data
			that rarely changes- examples: layer network identification,
			switching and adaptation capabilities and limitations, fate
			sharing, administrative colors) associated with data-plane nodes
			and links. It is possible for a single TE Topology to encompass TE
			information at multiple switching layers.
	+--rw link* [source-te-node-id source-te-link-id dest-te-node-id		- TE Topologies are protocol independent. Information about
	dest-te-link-id]		topological elements may be learnt via link-state protocols, but
	:		the topology can exist without being dependent on any particular
	+--rw te-link-attributes		protocol.
	+--rw underlay! {te-topology-hierarchy}?
	+--rw underlay-path
	:
	+--rw underlay-backup-path
	:
	+--rw underlay-protection-type? uint16
	+--rw underlay-trail-src
	:
	+--rw underlay-trail-des
	:
	2.3. Scheduling Parameters		- TE Topology may not be congruent to the routing topology (topology
			constructed based on routing adjacencies) in a given TE System.
			There isn't always a one-to-one association between a TE-link and
			a routing adjacency. For example, the presence of a TE link
			between a pair of nodes doesn't necessarily imply the existence of
			a routing-adjacency between these nodes.
	The model allows time scheduling parameters to be specified for each		- Each TE Topological element has an information source associated
	topological element. These parameters allow the provider to present		with it. In some scenarios, there could be more than one
	different topological views to the client at different time slots.		information source associated with each topological element.
	+--rw schedules* [schedule-id]		- TE Topologies can be hierarchical. Each node and link of a given
	| +--rw schedule-id uint32		TE Topology can be associated with respective underlay topology.
	| +--rw start? yang:date-and-time		This means that each node and link of a given TE Topology can be
	| +--rw schedule-duration? string		associated with an independent stack of supporting TE Topologies.
	| +--rw repeat-interval? string
	2.4. Abstract TE Topologies		- TE Topologies can be customized. TE topologies of a given network
			presented by the network provider to its client could be
			customized on per-client request basis. This customization could
			be performed by provider, by client or by provider/client
			negotiation. The relationship between a customized topology (as
			presented to the client) and provider's native topology (as known
			in its entirety to the provider itself) could be captured as
			hierarchical (overlay-underlay), but otherwise the two topologies
			are decoupled from each other.
	The model allows the provider to present the network in abstract		3. Model Applicability
	terms on per client basis and facilitates the notion of "TE Topology
	as a service". These topologies are typically decoupled from the
	actual network topology and are supposed to be fully comprehensible
	by the clients and contain sufficient information for the client path
	computers to select service paths according to the client policies.
	The model also allows the client to request changes to the abstract
	TE Topology that is presented to it and thus manipulate it.
	2.5. Open Items		3.1. Native TE Topologies
	o Relationship with "generic network topology" model: The generic		The model discussed in this draft can be used to represent and
	network topology building blocks are discussed in [YANG-NET-TOPO].		retrieve native TE topologies on a given TE system.
	This version of the document does not use any of those building
	blocks. The authors would like to explore the possibility of
	doing that in future revisions of this document.
	o Incremental notifications: The model proposed in this version does		+---+ +---+ +---+ +---+ +---+
	not cover incremental notifications. The authors intend to add		| R1|-------| R2|--------| R3|---------| R4|---------| R5|
	this in future revisions of the document.		+---+ +---+ +---+ +---+ +---+
			| / \ / \ /
			| / \ / \ /
			| / \ / \ /
			| / \ / \ /
			| / \ / \ /
			+---+ +---+ +---+ +---+
			| R6|-------------| R7| | R8|---------| R9|
			+---+ +---+ +---+ +---+
	3. Tree Structure		Figure 1a: Example Network Topology
	module: ietf-te-topology		---------------
	+--rw te-topologies		| Native | | [ ] TE Node
	| +--rw topology* [te-topology-id]		| TE-Topology | | +++ TE Link
	| | +--rw te-topology-id te-topology-id		--------------- o--------------
	| | +--rw topology-types		__________________
	| | | +--rw te-topology!		[R1] ++++ [R2] ++++ [R3] ++++ [R4] ++++ [R5]
	| | +--rw node* [te-node-id]		+ + + + + +
	| | | +--rw te-node-id te-node-id		+ + + + + +
	| | | +--rw te-node-template? leafref		+ + ++ ++
	| | | +--rw te-node-attributes		[R6] +++++++++ [R7] [R8] ++++ [R9]
	| | | +--rw schedules* [schedule-id]
	| | | | +--rw schedule-id uint32
	| | | | +--rw start? yang:date-and-time
	| | | | +--rw schedule-duration? string
	| | | | +--rw repeat-interval? string
	| | | +--rw name? inet:domain-name
	| | | +--rw signaling-address* inet:ip-address
	| | | +--rw flag* flag-type
	| | | +--rw is-abstract? boolean
	| | | +--rw underlay-topology? leafref
	{te-topology-hierarchy}?
	| | | +--rw te-link* [te-link-id]
	| | | | +--rw te-link-id te-link-id
	| | | | +--rw (stack-level)?
	| | | | +--:(bundle)
	| | | | | +--rw bundled-links
	| | | | | +--rw bundled-link* [sequence]
	| | | | | +--rw sequence uint32
	| | | | | +--rw te-link-ref? leafref
	| | | | +--:(component)
	| | | | +--rw component-links
	| | | | +--rw component-link* [sequence]
	| | | | +--rw sequence uint32
	| | | | +--rw component-link-ref? leafref
	| | | +--rw connectivity-matrix* [id]
	| | | | +--rw id uint32
	| | | | +--rw from-link
	| | | | | +--rw topo-ref? leafref
	| | | | | +--rw node-ref? leafref
	| | | | | +--rw link-end-ref? leafref
	| | | | +--rw to-link
	| | | | | +--rw topo-ref? leafref
	| | | | | +--rw node-ref? leafref
	| | | | | +--rw link-end-ref? leafref
	| | | | +--rw is-allowed? boolean
	| | | +--rw ted
	| | | +--rw te-router-id-ipv4? inet:ipv4-address
	| | | +--rw te-router-id-ipv6? inet:ipv6-address
	| | | +--rw ipv4-local-address* [ipv4-prefix]
	| | | | +--rw ipv4-prefix inet:ipv4-prefix
	| | | +--rw ipv6-local-address* [ipv6-prefix]
	| | | | +--rw ipv6-prefix inet:ipv6-prefix
	| | | | +--rw prefix-option? uint8
	| | | +--rw pcc-capabilities? pcc-capabilities
	| | +--rw link* [source-te-node-id source-te-link-id
	dest-te-node-id dest-te-link-id]
	| | +--rw source-te-node-id leafref
	| | +--rw source-te-link-id leafref
	| | +--rw dest-te-node-id leafref
	| | +--rw dest-te-link-id leafref
	| | +--rw te-link-template? leafref
	| | +--rw te-link-attributes
	| | +--rw schedules* [schedule-id]
	| | | +--rw schedule-id uint32
	| | | +--rw start? yang:date-and-time
	| | | +--rw schedule-duration? string
	| | | +--rw repeat-interval? string
	| | +--rw name? string
	| | +--rw flag* flag-type
	| | +--rw is-abstract? boolean
	| | +--rw underlay! {te-topology-hierarchy}?
	| | | +--rw underlay-path
	| | | | +--rw topology-id? leafref
	| | | | +--rw path-element* [path-element-id]
	| | | | +--rw path-element-id uint32
	| | | | +--rw loose? boolean
	| | | | +--rw (element-type)?
	| | | | +--:(numbered-link)
	| | | | | +--rw link-ip-address? inet:ip-address
	| | | | +--:(unnumbered-link)
	| | | | | +--rw link-node-id? uint32
	| | | | | +--rw te-link-id? uint32
	| | | | +--:(node)
	| | | | | +--rw te-node-id? uint32
	| | | | +--:(label)
	| | | | +--rw label? uint32
	| | | +--rw underlay-backup-path
	| | | | +--rw topology-id? leafref
	| | | | +--rw path-element* [path-element-id]
	| | | | +--rw path-element-id uint32
	| | | | +--rw loose? boolean
	| | | | +--rw (element-type)?
	| | | | +--:(numbered-link)
	| | | | | +--rw link-ip-address? inet:ip-address
	| | | | +--:(unnumbered-link)
	| | | | | +--rw link-node-id? uint32
	| | | | | +--rw te-link-id? uint32
	| | | | +--:(node)
	| | | | | +--rw te-node-id? uint32
	| | | | +--:(label)
	| | | | +--rw label? uint32
	| | | +--rw underlay-protection-type? uint16
	| | | +--rw underlay-trail-src
	| | | | +--rw topo-ref? leafref
	| | | | +--rw node-ref? leafref
	| | | | +--rw link-end-ref? leafref
	| | | +--rw underlay-trail-des
	| | | +--rw topo-ref? leafref
	| | | +--rw node-ref? leafref
	| | | +--rw link-end-ref? leafref
	| | +--rw ted
	| | +--rw admin-status? enumeration
	| | +--rw oper-status? enumeration
	| | +--rw area-id? binary
	| | +--rw performance-metric-throttle
	{te-performance-metric}?
	| | | +--rw unidirectional-delay-offset? uint32
	| | | +--rw measure-interval? uint32
	| | | +--rw advertisement-interval? uint32
	| | | +--rw suppression-interval? uint32
	| | | +--rw threshold-out
	| | | | +--rw unidirectional-delay? uint32
	| | | | +--rw unidirectional-min-delay? uint32
	| | | | +--rw unidirectional-max-delay? uint32
	| | | | +--rw unidirectional-delay-variation? uint32
	| | | | +--rw unidirectional-packet-loss? decimal64
	| | | | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | | | +--rw unidirectional-available-bandwidth?
	decimal64
	| | | | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| | | +--rw threshold-in
	| | | | +--rw unidirectional-delay?
	uint32
	| | | | +--rw unidirectional-min-delay?
	uint32
	| | | | +--rw unidirectional-max-delay?
	uint32
	| | | | +--rw unidirectional-delay-variation?
	uint32
	| | | | +--rw unidirectional-packet-loss?
	decimal64
	| | | | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | | | +--rw unidirectional-available-bandwidth?
	decimal64
	| | | | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| | | +--rw threshold-accelerated-advertisement
	| | | +--rw unidirectional-delay? uint32
	| | | +--rw unidirectional-min-delay? uint32
	| | | +--rw unidirectional-max-delay? uint32
	| | | +--rw unidirectional-delay-variation? uint32
	| | | +--rw unidirectional-packet-loss? decimal64
	| | | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | | +--rw unidirectional-available-bandwidth?
	decimal64
	| | | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| | +--rw information-source? enumeration
	| | +--rw credibility-preference? uint16
	| | +--rw link-index? uint64
	| | +--rw administrative-group* [sequence]
	| | | +--rw sequence uint32
	| | | +--rw ag-element? uint32
	| | +--rw max-link-bandwidth? decimal64
	| | +--rw max-resv-link-bandwidth? decimal64
	| | +--rw unreserved-bandwidth* [priority]
	| | | +--rw priority uint8
	| | | +--rw bandwidth? decimal64
	| | +--rw te-default-metric? uint32
	| | +--rw performance-metric {te-performance-metric}?
	| | | +--rw measurement
	| | | | +--rw unidirectional-delay? uint32
	| | | | +--rw unidirectional-min-delay? uint32
	| | | | +--rw unidirectional-max-delay? uint32
	| | | | +--rw unidirectional-delay-variation? uint32
	| | | | +--rw unidirectional-packet-loss? decimal64
	| | | | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | | | +--rw unidirectional-available-bandwidth?
	decimal64
	| | | | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| | | +--rw normality
	| | | +--rw unidirectional-delay?
	performance-metric-normality
	| | | +--rw unidirectional-min-delay?
	performance-metric-normality
	| | | +--rw unidirectional-max-delay?
	performance-metric-normality
	| | | +--rw unidirectional-delay-variation?
	performance-metric-normality
	| | | +--rw unidirectional-packet-loss?
	performance-metric-normality
	| | | +--rw unidirectional-residual-bandwidth?
	performance-metric-normality
	| | | +--rw unidirectional-available-bandwidth?
	performance-metric-normality
	| | | +--rw unidirectional-utilized-bandwidth?
	performance-metric-normality
	| | +--rw link-protection-type?
	enumeration
	| | +--rw interface-switching-capabilities*
	[switching-capability]
	| | | +--rw switching-capability
	ted:switching-capabilities
	| | | +--rw encoding?
	ted:encoding-type
	| | | +--rw max-lsp-bandwidth* [priority]
	| | | | +--rw priority uint8
	| | | | +--rw bandwidth? decimal64
	| | | +--rw packet-switch-capable
	| | | | +--rw minimum-lsp-bandwidth? decimal64
	| | | | +--rw interface-mtu? uint16
	| | | +--rw time-division-multiplex-capable
	| | | +--rw minimum-lsp-bandwidth? decimal64
	| | | +--rw indication? enumeration
	| | +--rw srlg
	| | | +--rw srlg-values* [srlg-value]
	| | | +--rw srlg-value uint32
	| | +--rw alt-information-sources* [information-source]
	| | +--rw information-source enumeration
	| | +--rw credibility-preference? uint16
	| | +--rw link-index? uint64
	| | +--rw administrative-group* [sequence]
	| | | +--rw sequence uint32
	| | | +--rw ag-element? uint32
	| | +--rw max-link-bandwidth? decimal64
	| | +--rw max-resv-link-bandwidth? decimal64
	| | +--rw unreserved-bandwidth* [priority]
	| | | +--rw priority uint8
	| | | +--rw bandwidth? decimal64
	| | +--rw te-default-metric? uint32
	| | +--rw performance-metric
	{te-performance-metric}?
	| | | +--rw measurement
	| | | | +--rw unidirectional-delay? uint32
	| | | | +--rw unidirectional-min-delay? uint32
	| | | | +--rw unidirectional-max-delay? uint32
	| | | | +--rw unidirectional-delay-variation?
	uint32
	| | | | +--rw unidirectional-packet-loss?
	decimal64
	| | | | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | | | +--rw unidirectional-available-bandwidth?
	decimal64
	| | | | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| | | +--rw normality
	| | | +--rw unidirectional-delay?
	performance-metric-normality
	| | | +--rw unidirectional-min-delay?
	performance-metric-normality
	| | | +--rw unidirectional-max-delay?
	performance-metric-normality
	| | | +--rw unidirectional-delay-variation?
	performance-metric-normality
	| | | +--rw unidirectional-packet-loss?
	performance-metric-normality
	| | | +--rw unidirectional-residual-bandwidth?
	performance-metric-normality
	| | | +--rw unidirectional-available-bandwidth?
	performance-metric-normality
	| | | +--rw unidirectional-utilized-bandwidth?
	performance-metric-normality
	| | +--rw link-protection-type?
	enumeration		Figure 1b: Native TE Topology as seen on Node R3
	| | +--rw interface-switching-capabilities*
	[switching-capability]
	| | | +--rw switching-capability
	ted:switching-capabilities
	| | | +--rw encoding?
	ted:encoding-type
	| | | +--rw max-lsp-bandwidth* [priority]
	| | | | +--rw priority uint8
	| | | | +--rw bandwidth? decimal64
	| | | +--rw packet-switch-capable
	| | | | +--rw minimum-lsp-bandwidth? decimal64
	| | | | +--rw interface-mtu? uint16
	| | | +--rw time-division-multiplex-capable
	| | | +--rw minimum-lsp-bandwidth? decimal64
	| | | +--rw indication? enumeration
	| | +--rw srlg
	| | +--rw srlg-values* [srlg-value]
	| | +--rw srlg-value uint32
	| +--rw node-template* [name]
	| | +--rw name te-template-name
	| | +--rw te-node-attributes
	| | +--rw schedules* [schedule-id]
	| | | +--rw schedule-id uint32
	| | | +--rw start? yang:date-and-time
	| | | +--rw schedule-duration? string
	| | | +--rw repeat-interval? string
	| | +--rw name? inet:domain-name
	| | +--rw signaling-address* inet:ip-address
	| | +--rw flag* flag-type
	| | +--rw is-abstract? boolean
	| | +--rw underlay-topology? leafref
	{te-topology-hierarchy}?
	| | +--rw te-link* [te-link-id]
	| | | +--rw te-link-id te-link-id
	| | | +--rw (stack-level)?
	| | | +--:(bundle)
	| | | | +--rw bundled-links
	| | | | +--rw bundled-link* [sequence]
	| | | | +--rw sequence uint32
	| | | | +--rw te-link-ref? leafref
	| | | +--:(component)
	| | | +--rw component-links
	| | | +--rw component-link* [sequence]
	| | | +--rw sequence uint32
	| | | +--rw component-link-ref? leafref
	| | +--rw connectivity-matrix* [id]
	| | | +--rw id uint32
	| | | +--rw from-link
	| | | | +--rw topo-ref? leafref
	| | | | +--rw node-ref? leafref
	| | | | +--rw link-end-ref? leafref
	| | | +--rw to-link
	| | | | +--rw topo-ref? leafref
	| | | | +--rw node-ref? leafref
	| | | | +--rw link-end-ref? leafref
	| | | +--rw is-allowed? boolean
	| | +--rw ted
	| | +--rw te-router-id-ipv4? inet:ipv4-address
	| | +--rw te-router-id-ipv6? inet:ipv6-address
	| | +--rw ipv4-local-address* [ipv4-prefix]
	| | | +--rw ipv4-prefix inet:ipv4-prefix
	| | +--rw ipv6-local-address* [ipv6-prefix]
	| | | +--rw ipv6-prefix inet:ipv6-prefix
	| | | +--rw prefix-option? uint8
	| | +--rw pcc-capabilities? pcc-capabilities
	| +--rw link-template* [name]
	| +--rw name te-template-name
	| +--rw te-link-attributes
	| +--rw schedules* [schedule-id]
	| | +--rw schedule-id uint32
	| | +--rw start? yang:date-and-time
	| | +--rw schedule-duration? string
	| | +--rw repeat-interval? string
	| +--rw name? string
	| +--rw flag* flag-type
	| +--rw is-abstract? boolean
	| +--rw underlay! {te-topology-hierarchy}?
	| | +--rw underlay-path
	| | | +--rw topology-id? leafref
	| | | +--rw path-element* [path-element-id]
	| | | +--rw path-element-id uint32
	| | | +--rw loose? boolean
	| | | +--rw (element-type)?
	| | | +--:(numbered-link)
	| | | | +--rw link-ip-address? inet:ip-address
	| | | +--:(unnumbered-link)
	| | | | +--rw link-node-id? uint32
	| | | | +--rw te-link-id? uint32
	| | | +--:(node)
	| | | | +--rw te-node-id? uint32
	| | | +--:(label)
	| | | +--rw label? uint32
	| | +--rw underlay-backup-path
	| | | +--rw topology-id? leafref
	| | | +--rw path-element* [path-element-id]
	| | | +--rw path-element-id uint32
	| | | +--rw loose? boolean
	| | | +--rw (element-type)?
	| | | +--:(numbered-link)
	| | | | +--rw link-ip-address? inet:ip-address
	| | | +--:(unnumbered-link)
	| | | | +--rw link-node-id? uint32
	| | | | +--rw te-link-id? uint32
	| | | +--:(node)
	| | | | +--rw te-node-id? uint32
	| | | +--:(label)
	| | | +--rw label? uint32
	| | +--rw underlay-protection-type? uint16
	| | +--rw underlay-trail-src
	| | | +--rw topo-ref? leafref
	| | | +--rw node-ref? leafref
	| | | +--rw link-end-ref? leafref
	| | +--rw underlay-trail-des
	| | +--rw topo-ref? leafref
	| | +--rw node-ref? leafref
	| | +--rw link-end-ref? leafref
	| +--rw ted
	| +--rw admin-status? enumeration
	| +--rw oper-status? enumeration
	| +--rw area-id? binary
	| +--rw performance-metric-throttle
	{te-performance-metric}?
	| | +--rw unidirectional-delay-offset? uint32
	| | +--rw measure-interval? uint32
	| | +--rw advertisement-interval? uint32
	| | +--rw suppression-interval? uint32
	| | +--rw threshold-out
	| | | +--rw unidirectional-delay? uint32
	| | | +--rw unidirectional-min-delay? uint32
	| | | +--rw unidirectional-max-delay? uint32
	| | | +--rw unidirectional-delay-variation? uint32
	| | | +--rw unidirectional-packet-loss? decimal64
	| | | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | | +--rw unidirectional-available-bandwidth?
	decimal64
	| | | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| | +--rw threshold-in
	| | | +--rw unidirectional-delay? uint32
	| | | +--rw unidirectional-min-delay? uint32
	| | | +--rw unidirectional-max-delay? uint32
	| | | +--rw unidirectional-delay-variation? uint32
	| | | +--rw unidirectional-packet-loss? decimal64
	| | | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | | +--rw unidirectional-available-bandwidth?
	decimal64
	| | | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| | +--rw threshold-accelerated-advertisement
	| | +--rw unidirectional-delay? uint32
	| | +--rw unidirectional-min-delay? uint32
	| | +--rw unidirectional-max-delay? uint32
	| | +--rw unidirectional-delay-variation? uint32
	| | +--rw unidirectional-packet-loss? decimal64
	| | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | +--rw unidirectional-available-bandwidth?
	decimal64
	| | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| +--rw information-source? enumeration
	| +--rw credibility-preference? uint16
	| +--rw link-index? uint64
	| +--rw administrative-group* [sequence]
	| | +--rw sequence uint32
	| | +--rw ag-element? uint32
	| +--rw max-link-bandwidth? decimal64
	| +--rw max-resv-link-bandwidth? decimal64
	| +--rw unreserved-bandwidth* [priority]
	| | +--rw priority uint8
	| | +--rw bandwidth? decimal64
	| +--rw te-default-metric? uint32
	| +--rw performance-metric {te-performance-metric}?
	| | +--rw measurement
	| | | +--rw unidirectional-delay? uint32
	| | | +--rw unidirectional-min-delay? uint32
	| | | +--rw unidirectional-max-delay? uint32
	| | | +--rw unidirectional-delay-variation? uint32
	| | | +--rw unidirectional-packet-loss? decimal64
	| | | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | | +--rw unidirectional-available-bandwidth?
	decimal64
	| | | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| | +--rw normality
	| | +--rw unidirectional-delay?
	performance-metric-normality
	| | +--rw unidirectional-min-delay?
	performance-metric-normality		Consider the network topology depicted in Figure 1a (R1 .. R9 are
	| | +--rw unidirectional-max-delay?		nodes representing routers). An implementation MAY choose to
	performance-metric-normality		construct a native TE Topology using all nodes and links present in
	| | +--rw unidirectional-delay-variation?		the given TED as depicted in Figure 1b. The data model proposed in
	performance-metric-normality		this document can be used to retrieve/represent this TE topology.
	| | +--rw unidirectional-packet-loss?
	performance-metric-normality
	| | +--rw unidirectional-residual-bandwidth?
	performance-metric-normality
	| | +--rw unidirectional-available-bandwidth?
	performance-metric-normality
	| | +--rw unidirectional-utilized-bandwidth?
	performance-metric-normality
	| +--rw link-protection-type? enumeration
	| +--rw interface-switching-capabilities*
	[switching-capability]
	| | +--rw switching-capability
	ted:switching-capabilities
	| | +--rw encoding? ted:encoding-type
	| | +--rw max-lsp-bandwidth* [priority]
	| | | +--rw priority uint8
	| | | +--rw bandwidth? decimal64
	| | +--rw packet-switch-capable
	| | | +--rw minimum-lsp-bandwidth? decimal64
	| | | +--rw interface-mtu? uint16
	| | +--rw time-division-multiplex-capable
	| | +--rw minimum-lsp-bandwidth? decimal64
	| | +--rw indication? enumeration
	| +--rw srlg
	| | +--rw srlg-values* [srlg-value]
	| | +--rw srlg-value uint32
	| +--rw alt-information-sources* [information-source]
	| +--rw information-source enumeration
	| +--rw credibility-preference? uint16
	| +--rw link-index? uint64
	| +--rw administrative-group* [sequence]
	| | +--rw sequence uint32
	| | +--rw ag-element? uint32
	| +--rw max-link-bandwidth? decimal64
	| +--rw max-resv-link-bandwidth? decimal64
	| +--rw unreserved-bandwidth* [priority]
	| | +--rw priority uint8
	| | +--rw bandwidth? decimal64
	| +--rw te-default-metric? uint32
	| +--rw performance-metric {te-performance-metric}?
	| | +--rw measurement
	| | | +--rw unidirectional-delay? uint32
	| | | +--rw unidirectional-min-delay? uint32
	| | | +--rw unidirectional-max-delay? uint32
	| | | +--rw unidirectional-delay-variation? uint32
	| | | +--rw unidirectional-packet-loss? decimal64
	| | | +--rw unidirectional-residual-bandwidth?
	decimal64
	| | | +--rw unidirectional-available-bandwidth?
	decimal64
	| | | +--rw unidirectional-utilized-bandwidth?
	decimal64
	| | +--rw normality
	| | +--rw unidirectional-delay?
	performance-metric-normality
	| | +--rw unidirectional-min-delay?
	performance-metric-normality
	| | +--rw unidirectional-max-delay?
	performance-metric-normality
	| | +--rw unidirectional-delay-variation?
	performance-metric-normality
	| | +--rw unidirectional-packet-loss?
	performance-metric-normality
	| | +--rw unidirectional-residual-bandwidth?
	performance-metric-normality
	| | +--rw unidirectional-available-bandwidth?
	performance-metric-normality
	| | +--rw unidirectional-utilized-bandwidth?
	performance-metric-normality
	| +--rw link-protection-type? enumeration
	| +--rw interface-switching-capabilities*
	[switching-capability]
	| | +--rw switching-capability
	ted:switching-capabilities
	| | +--rw encoding? ted:encoding-type
	| | +--rw max-lsp-bandwidth* [priority]
	| | | +--rw priority uint8
	| | | +--rw bandwidth? decimal64
	| | +--rw packet-switch-capable
	| | | +--rw minimum-lsp-bandwidth? decimal64
	| | | +--rw interface-mtu? uint16
	| | +--rw time-division-multiplex-capable
	| | +--rw minimum-lsp-bandwidth? decimal64
	| | +--rw indication? enumeration
	| +--rw srlg
	| +--rw srlg-values* [srlg-value]
	| +--rw srlg-value uint32
	+--ro te-topologies-state
	+--ro topology* [te-topology-id]
	+--ro te-topology-id te-topology-id
	+--ro server-provided? boolean
	+--ro topology-types
	| +--ro te-topology!
	+--ro node* [te-node-id]
	| +--ro te-node-id te-node-id
	| +--ro te-node-template? leafref
	| +--ro te-node-attributes
	| | +--ro schedules* [schedule-id]
	| | | +--ro schedule-id uint32
	| | | +--ro start? yang:date-and-time
	| | | +--ro schedule-duration? string
	| | | +--ro repeat-interval? string
	| | +--ro name? inet:domain-name
	| | +--ro signaling-address* inet:ip-address
	| | +--ro flag* flag-type
	| | +--ro is-abstract? boolean
	| | +--ro underlay-topology? leafref
	{te-topology-hierarchy}?
	| | +--ro te-link* [te-link-id]
	| | | +--ro te-link-id te-link-id
	| | | +--ro (stack-level)?
	| | | +--:(bundle)
	| | | | +--ro bundled-links
	| | | | +--ro bundled-link* [sequence]
	| | | | +--ro sequence uint32
	| | | | +--ro te-link-ref? leafref
	| | | +--:(component)
	| | | +--ro component-links
	| | | +--ro component-link* [sequence]
	| | | +--ro sequence uint32
	| | | +--ro component-link-ref? leafref
	| | +--ro connectivity-matrix* [id]
	| | | +--ro id uint32
	| | | +--ro from-link
	| | | | +--ro topo-ref? leafref
	| | | | +--ro node-ref? leafref
	| | | | +--ro link-end-ref? leafref
	| | | +--ro to-link
	| | | | +--ro topo-ref? leafref
	| | | | +--ro node-ref? leafref
	| | | | +--ro link-end-ref? leafref
	| | | +--ro is-allowed? boolean
	| | +--ro ted
	| | +--ro te-router-id-ipv4? inet:ipv4-address
	| | +--ro te-router-id-ipv6? inet:ipv6-address
	| | +--ro ipv4-local-address* [ipv4-prefix]
	| | | +--ro ipv4-prefix inet:ipv4-prefix
	| | +--ro ipv6-local-address* [ipv6-prefix]
	| | | +--ro ipv6-prefix inet:ipv6-prefix
	| | | +--ro prefix-option? uint8
	| | +--ro pcc-capabilities? pcc-capabilities
	| +--ro te-node-state-attributes
	| +--ro information-source? enumeration
	| +--ro credibility-preference? uint16
	+--ro link* [source-te-node-id source-te-link-id
	dest-te-node-id dest-te-link-id]
	+--ro source-te-node-id leafref
	+--ro source-te-link-id leafref
	+--ro dest-te-node-id leafref
	+--ro dest-te-link-id leafref
	+--ro te-link-template? leafref
	+--ro te-link-attributes
	| +--ro schedules* [schedule-id]
	| | +--ro schedule-id uint32
	| | +--ro start? yang:date-and-time
	| | +--ro schedule-duration? string
	| | +--ro repeat-interval? string
	| +--ro name? string
	| +--ro flag* flag-type
	| +--ro is-abstract? boolean
	| +--ro underlay! {te-topology-hierarchy}?
	| | +--ro underlay-path
	| | | +--ro topology-id? leafref
	| | | +--ro path-element* [path-element-id]
	| | | +--ro path-element-id uint32
	| | | +--ro loose? boolean
	| | | +--ro (element-type)?
	| | | +--:(numbered-link)
	| | | | +--ro link-ip-address? inet:ip-address
	| | | +--:(unnumbered-link)
	| | | | +--ro link-node-id? uint32
	| | | | +--ro te-link-id? uint32
	| | | +--:(node)
	| | | | +--ro te-node-id? uint32
	| | | +--:(label)
	| | | +--ro label? uint32
	| | +--ro underlay-backup-path
	| | | +--ro topology-id? leafref
	| | | +--ro path-element* [path-element-id]
	| | | +--ro path-element-id uint32
	| | | +--ro loose? boolean
	| | | +--ro (element-type)?
	| | | +--:(numbered-link)
	| | | | +--ro link-ip-address? inet:ip-address
	| | | +--:(unnumbered-link)
	| | | | +--ro link-node-id? uint32
	| | | | +--ro te-link-id? uint32
	| | | +--:(node)
	| | | | +--ro te-node-id? uint32
	| | | +--:(label)
	| | | +--ro label? uint32
	| | +--ro underlay-protection-type? uint16
	| | +--ro underlay-trail-src
	| | | +--ro topo-ref? leafref
	| | | +--ro node-ref? leafref
	| | | +--ro link-end-ref? leafref
	| | +--ro underlay-trail-des
	| | | +--ro topo-ref? leafref
	| | | +--ro node-ref? leafref
	| | | +--ro link-end-ref? leafref
	| | +--ro dynamic? boolean
	| | +--ro committed? boolean
	| +--ro ted
	| +--ro admin-status? enumeration
	| +--ro oper-status? enumeration
	| +--ro area-id? binary
	| +--ro performance-metric-throttle {te-performance-metric}?
	| | +--ro unidirectional-delay-offset? uint32
	| | +--ro measure-interval? uint32
	| | +--ro advertisement-interval? uint32
	| | +--ro suppression-interval? uint32
	| | +--ro threshold-out
	| | | +--ro unidirectional-delay? uint32
	| | | +--ro unidirectional-min-delay? uint32
	| | | +--ro unidirectional-max-delay? uint32
	| | | +--ro unidirectional-delay-variation? uint32
	| | | +--ro unidirectional-packet-loss?
	decimal64
	| | | +--ro unidirectional-residual-bandwidth?
	decimal64
	| | | +--ro unidirectional-available-bandwidth?
	decimal64
	| | | +--ro unidirectional-utilized-bandwidth?
	decimal64
	| | +--ro threshold-in
	| | | +--ro unidirectional-delay? uint32
	| | | +--ro unidirectional-min-delay? uint32
	| | | +--ro unidirectional-max-delay? uint32
	| | | +--ro unidirectional-delay-variation? uint32
	| | | +--ro unidirectional-packet-loss? decimal64
	| | | +--ro unidirectional-residual-bandwidth?
	decimal64
	| | | +--ro unidirectional-available-bandwidth?
	decimal64
	| | | +--ro unidirectional-utilized-bandwidth?
	decimal64		:
	| | +--ro threshold-accelerated-advertisement		TE info distributed via ISIS-TE : TE info distributed via OSPF-TE
	| | +--ro unidirectional-delay? uint32		:
	| | +--ro unidirectional-min-delay? uint32		+---+ +---+ +---+ +---+ +---+
	| | +--ro unidirectional-max-delay? uint32		| R1|-------| R2|--------| R3|---------| R4|---------| R5|
	| | +--ro unidirectional-delay-variation? uint32		+---+ +---+ +---+ +---+ +---+
	| | +--ro unidirectional-packet-loss? decimal64		| / : \ / \ /
	| | +--ro unidirectional-residual-bandwidth?		| / : \ / \ /
	decimal64		| / : \ / \ /
	| | +--ro unidirectional-available-bandwidth?		| / : \ / \ /
	decimal64		| / : \ / \ /
	| | +--ro unidirectional-utilized-bandwidth?		+---+ +---+ : +---+ +---+
	decimal64		| R6|-------------| R7| : | R8|---------| R9|
	| +--ro information-source? enumeration		+---+ +---+ : +---+ +---+
	| +--ro credibility-preference? uint16		:
	| +--ro link-index? uint64
	| +--ro administrative-group* [sequence]
	| | +--ro sequence uint32
	| | +--ro ag-element? uint32
	| +--ro max-link-bandwidth? decimal64
	| +--ro max-resv-link-bandwidth? decimal64
	| +--ro unreserved-bandwidth* [priority]
	| | +--ro priority uint8
	| | +--ro bandwidth? decimal64
	| +--ro te-default-metric? uint32
	| +--ro performance-metric {te-performance-metric}?
	| | +--ro measurement
	| | | +--ro unidirectional-delay? uint32
	| | | +--ro unidirectional-min-delay? uint32
	| | | +--ro unidirectional-max-delay? uint32
	| | | +--ro unidirectional-delay-variation? uint32
	| | | +--ro unidirectional-packet-loss? decimal64
	| | | +--ro unidirectional-residual-bandwidth?
	decimal64
	| | | +--ro unidirectional-available-bandwidth?
	decimal64
	| | | +--ro unidirectional-utilized-bandwidth?
	decimal64
	| | +--ro normality
	| | +--ro unidirectional-delay?
	performance-metric-normality
	| | +--ro unidirectional-min-delay?
	performance-metric-normality
	| | +--ro unidirectional-max-delay?
	performance-metric-normality
	| | +--ro unidirectional-delay-variation?
	performance-metric-normality
	| | +--ro unidirectional-packet-loss?
	performance-metric-normality		Figure 2a: Example Network Topology
	| | +--ro unidirectional-residual-bandwidth?
	performance-metric-normality
	| | +--ro unidirectional-available-bandwidth?
	performance-metric-normality
	| | +--ro unidirectional-utilized-bandwidth?
	performance-metric-normality
	| +--ro link-protection-type? enumeration
	| +--ro interface-switching-capabilities*
	[switching-capability]
	| | +--ro switching-capability
	ted:switching-capabilities
	| | +--ro encoding?
	ted:encoding-type
	| | +--ro max-lsp-bandwidth* [priority]
	| | | +--ro priority uint8
	| | | +--ro bandwidth? decimal64
	| | +--ro packet-switch-capable
	| | | +--ro minimum-lsp-bandwidth? decimal64
	| | | +--ro interface-mtu? uint16
	| | +--ro time-division-multiplex-capable
	| | +--ro minimum-lsp-bandwidth? decimal64
	| | +--ro indication? enumeration
	| +--ro srlg
	| | +--ro srlg-values* [srlg-value]
	| | +--ro srlg-value uint32
	| +--ro alt-information-sources* [information-source]
	| +--ro information-source enumeration
	| +--ro credibility-preference? uint16
	| +--ro link-index? uint64
	| +--ro administrative-group* [sequence]
	| | +--ro sequence uint32
	| | +--ro ag-element? uint32
	| +--ro max-link-bandwidth? decimal64
	| +--ro max-resv-link-bandwidth? decimal64
	| +--ro unreserved-bandwidth* [priority]
	| | +--ro priority uint8
	| | +--ro bandwidth? decimal64
	| +--ro te-default-metric? uint32
	| +--ro performance-metric
	{te-performance-metric}?
	| | +--ro measurement
	| | | +--ro unidirectional-delay? uint32
	| | | +--ro unidirectional-min-delay? uint32
	| | | +--ro unidirectional-max-delay? uint32
	| | | +--ro unidirectional-delay-variation?
	uint32
	| | | +--ro unidirectional-packet-loss?
	decimal64		----------------------- : -----------------------
	| | | +--ro unidirectional-residual-bandwidth?		|Native TE Topology | : |Native TE Topology |
	decimal64		|Info-Source: ISIS-TE | : |Info-Source: OSPF-TE |
	| | | +--ro unidirectional-available-bandwidth?		----------------------- : -----------------------
	decimal64		:
	| | | +--ro unidirectional-utilized-bandwidth?		[R1] ++++ [R2] ++++ [R3] : [R3'] ++++ [R4] ++++ [R5]
	decimal64		+ + : + + + +
	| | +--ro normality		+ + : + + + +
	| | +--ro unidirectional-delay?		+ + : ++ ++
	performance-metric-normality		[R6] +++++++++ [R7] : [R8] ++++ [R9]
	| | +--ro unidirectional-min-delay?
	performance-metric-normality
	| | +--ro unidirectional-max-delay?
	performance-metric-normality
	| | +--ro unidirectional-delay-variation?
	performance-metric-normality
	| | +--ro unidirectional-packet-loss?
	performance-metric-normality
	| | +--ro unidirectional-residual-bandwidth?
	performance-metric-normality
	| | +--ro unidirectional-available-bandwidth?
	performance-metric-normality
	| | +--ro unidirectional-utilized-bandwidth?
	performance-metric-normality
	| +--ro link-protection-type? enumeration
	| +--ro interface-switching-capabilities*
	[switching-capability]
	| | +--ro switching-capability
	ted:switching-capabilities
	| | +--ro encoding? ted:encoding-type
	| | +--ro max-lsp-bandwidth* [priority]
	| | | +--ro priority uint8
	| | | +--ro bandwidth? decimal64
	| | +--ro packet-switch-capable
	| | | +--ro minimum-lsp-bandwidth? decimal64
	| | | +--ro interface-mtu? uint16
	| | +--ro time-division-multiplex-capable
	| | +--ro minimum-lsp-bandwidth? decimal64
	| | +--ro indication? enumeration
	| +--ro srlg
	| +--ro srlg-values* [srlg-value]
	| +--ro srlg-value uint32
	+--ro te-link-state-attributes
	+--ro information-source? enumeration
	+--ro credibility-preference? uint16
	notifications:
	+---n te-node-event
	| +--ro event-type? te-topology-event-type
	| +--ro topo-ref? leafref
	| +--ro node-ref? leafref
	| +--ro te-topology!
	| +--ro te-node-attributes
	| +--ro schedules* [schedule-id]
	| | +--ro schedule-id uint32
	| | +--ro start? yang:date-and-time
	| | +--ro schedule-duration? string
	| | +--ro repeat-interval? string
	| +--ro name? inet:domain-name
	| +--ro signaling-address* inet:ip-address
	| +--ro flag* flag-type
	| +--ro is-abstract? boolean
	| +--ro underlay-topology? leafref {te-topology-hierarchy}?
	| +--ro te-link* [te-link-id]
	| | +--ro te-link-id te-link-id
	| | +--ro (stack-level)?
	| | +--:(bundle)
	| | | +--ro bundled-links
	| | | +--ro bundled-link* [sequence]
	| | | +--ro sequence uint32
	| | | +--ro te-link-ref? leafref
	| | +--:(component)
	| | +--ro component-links
	| | +--ro component-link* [sequence]
	| | +--ro sequence uint32
	| | +--ro component-link-ref? leafref
	| +--ro connectivity-matrix* [id]
	| | +--ro id uint32
	| | +--ro from-link
	| | | +--ro topo-ref? leafref
	| | | +--ro node-ref? leafref
	| | | +--ro link-end-ref? leafref
	| | +--ro to-link
	| | | +--ro topo-ref? leafref
	| | | +--ro node-ref? leafref
	| | | +--ro link-end-ref? leafref
	| | +--ro is-allowed? boolean
	| +--ro ted
	| +--ro te-router-id-ipv4? inet:ipv4-address
	| +--ro te-router-id-ipv6? inet:ipv6-address
	| +--ro ipv4-local-address* [ipv4-prefix]
	| | +--ro ipv4-prefix inet:ipv4-prefix
	| +--ro ipv6-local-address* [ipv6-prefix]
	| | +--ro ipv6-prefix inet:ipv6-prefix
	| | +--ro prefix-option? uint8
	| +--ro pcc-capabilities? pcc-capabilities
	+---n te-link-event
	+--ro event-type? te-topology-event-type
	+--ro topo-ref? leafref
	+--ro source-te-node-id-ref? leafref
	+--ro source-te-link-id-ref? leafref
	+--ro dest-te-node-id-ref? leafref
	+--ro dest-te-link-id-ref? leafref
	+--ro te-topology!
	+--ro te-link-attributes
	+--ro schedules* [schedule-id]
	| +--ro schedule-id uint32
	| +--ro start? yang:date-and-time
	| +--ro schedule-duration? string
	| +--ro repeat-interval? string
	+--ro name? string
	+--ro flag* flag-type
	+--ro is-abstract? boolean
	+--ro underlay! {te-topology-hierarchy}?
	| +--ro underlay-path
	| | +--ro topology-id? leafref
	| | +--ro path-element* [path-element-id]
	| | +--ro path-element-id uint32
	| | +--ro loose? boolean
	| | +--ro (element-type)?
	| | +--:(numbered-link)
	| | | +--ro link-ip-address? inet:ip-address
	| | +--:(unnumbered-link)
	| | | +--ro link-node-id? uint32
	| | | +--ro te-link-id? uint32
	| | +--:(node)
	| | | +--ro te-node-id? uint32
	| | +--:(label)
	| | +--ro label? uint32
	| +--ro underlay-backup-path
	| | +--ro topology-id? leafref
	| | +--ro path-element* [path-element-id]
	| | +--ro path-element-id uint32
	| | +--ro loose? boolean
	| | +--ro (element-type)?
	| | +--:(numbered-link)
	| | | +--ro link-ip-address? inet:ip-address
	| | +--:(unnumbered-link)
	| | | +--ro link-node-id? uint32
	| | | +--ro te-link-id? uint32
	| | +--:(node)
	| | | +--ro te-node-id? uint32
	| | +--:(label)
	| | +--ro label? uint32
	| +--ro underlay-protection-type? uint16
	| +--ro underlay-trail-src
	| | +--ro topo-ref? leafref
	| | +--ro node-ref? leafref
	| | +--ro link-end-ref? leafref
	| +--ro underlay-trail-des
	| | +--ro topo-ref? leafref
	| | +--ro node-ref? leafref
	| | +--ro link-end-ref? leafref
	| +--ro dynamic? boolean
	| +--ro committed? boolean
	+--ro ted
	+--ro admin-status? enumeration
	+--ro oper-status? enumeration
	+--ro area-id? binary
	+--ro performance-metric-throttle{te-performance-metric}?
	| +--ro unidirectional-delay-offset? uint32
	| +--ro measure-interval? uint32
	| +--ro advertisement-interval? uint32
	| +--ro suppression-interval? uint32
	| +--ro threshold-out
	| | +--ro unidirectional-delay? uint32
	| | +--ro unidirectional-min-delay? uint32
	| | +--ro unidirectional-max-delay? uint32
	| | +--ro unidirectional-delay-variation? uint32
	| | +--ro unidirectional-packet-loss?
	decimal64
	| | +--ro unidirectional-residual-bandwidth?
	decimal64
	| | +--ro unidirectional-available-bandwidth?
	decimal64
	| | +--ro unidirectional-utilized-bandwidth?
	decimal64
	| +--ro threshold-in
	| | +--ro unidirectional-delay? uint32
	| | +--ro unidirectional-min-delay? uint32
	| | +--ro unidirectional-max-delay? uint32
	| | +--ro unidirectional-delay-variation? uint32
	| | +--ro unidirectional-packet-loss? decimal64
	| | +--ro unidirectional-residual-bandwidth? decimal64
	| | +--ro unidirectional-available-bandwidth? decimal64
	| | +--ro unidirectional-utilized-bandwidth? decimal64
	| +--ro threshold-accelerated-advertisement
	| +--ro unidirectional-delay? uint32
	| +--ro unidirectional-min-delay? uint32
	| +--ro unidirectional-max-delay? uint32
	| +--ro unidirectional-delay-variation? uint32
	| +--ro unidirectional-packet-loss? decimal64
	| +--ro unidirectional-residual-bandwidth? decimal64
	| +--ro unidirectional-available-bandwidth? decimal64
	| +--ro unidirectional-utilized-bandwidth? decimal64
	+--ro information-source? enumeration
	+--ro credibility-preference? uint16
	+--ro link-index? uint64
	+--ro administrative-group* [sequence]
	| +--ro sequence uint32
	| +--ro ag-element? uint32
	+--ro max-link-bandwidth? decimal64
	+--ro max-resv-link-bandwidth? decimal64
	+--ro unreserved-bandwidth* [priority]
	| +--ro priority uint8
	| +--ro bandwidth? decimal64
	+--ro te-default-metric? uint32
	+--ro performance-metric {te-performance-metric}?
	| +--ro measurement
	| | +--ro unidirectional-delay? uint32
	| | +--ro unidirectional-min-delay? uint32
	| | +--ro unidirectional-max-delay? uint32
	| | +--ro unidirectional-delay-variation? uint32
	| | +--ro unidirectional-packet-loss? decimal64
	| | +--ro unidirectional-residual-bandwidth? decimal64
	| | +--ro unidirectional-available-bandwidth? decimal64
	| | +--ro unidirectional-utilized-bandwidth? decimal64
	| +--ro normality
	| +--ro unidirectional-delay?
	performance-metric-normality
	| +--ro unidirectional-min-delay?
	performance-metric-normality
	| +--ro unidirectional-max-delay?
	performance-metric-normality
	| +--ro unidirectional-delay-variation?
	performance-metric-normality
	| +--ro unidirectional-packet-loss?
	performance-metric-normality
	| +--ro unidirectional-residual-bandwidth?
	performance-metric-normality
	| +--ro unidirectional-available-bandwidth?
	performance-metric-normality
	| +--ro unidirectional-utilized-bandwidth?
	performance-metric-normality
	+--ro link-protection-type? enumeration
	+--ro interface-switching-capabilities*
	[switching-capability]
	| +--ro switching-capability ted:switching-capabilities
	| +--ro encoding? ted:encoding-type
	| +--ro max-lsp-bandwidth* [priority]
	| | +--ro priority uint8
	| | +--ro bandwidth? decimal64
	| +--ro packet-switch-capable
	| | +--ro minimum-lsp-bandwidth? decimal64
	| | +--ro interface-mtu? uint16
	| +--ro time-division-multiplex-capable
	| +--ro minimum-lsp-bandwidth? decimal64
	| +--ro indication? enumeration
	+--ro srlg
	| +--ro srlg-values* [srlg-value]
	| +--ro srlg-value uint32
	+--ro alt-information-sources* [information-source]
	+--ro information-source enumeration
	+--ro credibility-preference? uint16
	+--ro link-index? uint64
	+--ro administrative-group* [sequence]
	| +--ro sequence uint32
	| +--ro ag-element? uint32
	+--ro max-link-bandwidth? decimal64
	+--ro max-resv-link-bandwidth? decimal64
	+--ro unreserved-bandwidth* [priority]
	| +--ro priority uint8
	| +--ro bandwidth? decimal64
	+--ro te-default-metric? uint32
	+--ro performance-metric {te-performance-metric}?
	| +--ro measurement
	| | +--ro unidirectional-delay? uint32
	| | +--ro unidirectional-min-delay? uint32
	| | +--ro unidirectional-max-delay? uint32
	| | +--ro unidirectional-delay-variation? uint32
	| | +--ro unidirectional-packet-loss? decimal64
	| | +--ro unidirectional-residual-bandwidth?
	decimal64
	| | +--ro unidirectional-available-bandwidth?
	decimal64
	| | +--ro unidirectional-utilized-bandwidth?
	decimal64
	| +--ro normality
	| +--ro unidirectional-delay?
	performance-metric-normality
	| +--ro unidirectional-min-delay?
	performance-metric-normality
	| +--ro unidirectional-max-delay?
	performance-metric-normality
	| +--ro unidirectional-delay-variation?
	performance-metric-normality
	| +--ro unidirectional-packet-loss?
	performance-metric-normality
	| +--ro unidirectional-residual-bandwidth?
	performance-metric-normality		Figure 2b: Native TE Topologies as seen on Node R3
	| +--ro unidirectional-available-bandwidth?
	performance-metric-normality
	| +--ro unidirectional-utilized-bandwidth?
	performance-metric-normality
	+--ro link-protection-type? enumeration
	+--ro interface-switching-capabilities*
	[switching-capability]
	| +--ro switching-capability
	ted:switching-capabilities
	| +--ro encoding? ted:encoding-type
	| +--ro max-lsp-bandwidth* [priority]
	| | +--ro priority uint8
	| | +--ro bandwidth? decimal64
	| +--ro packet-switch-capable
	| | +--ro minimum-lsp-bandwidth? decimal64
	| | +--ro interface-mtu? uint16
	| +--ro time-division-multiplex-capable
	| +--ro minimum-lsp-bandwidth? decimal64
	| +--ro indication? enumeration
	+--ro srlg
	+--ro srlg-values* [srlg-value]
	+--ro srlg-value uint32
	3.1. TE Topology Yang Module		Consider the case of the topology being split in a way that some
			nodes participate in OSPF-TE while others participate in ISIS-TE
			(Figure 2a). An implementation MAY choose to construct separate TE
			Topologies based on the information source. The native TE Topologies
			constructed using only nodes and links that were learnt via a
			specific information source are depicted in Figure 2b. The data
			model proposed in this document can be used to retrieve/represent
			these TE topologies.
	<CODE BEGINS> file "ietf-te-topology@2015-03-23.yang"		Similarly, the data model can be used to represent/retrieve a TE
	module ietf-te-topology {		Topology that is constructed using only nodes and links that belong
	yang-version 1;		to a particular technology layer. The data model is flexible enough
	namespace "urn:ietf:params:xml:ns:yang:ietf-te-topology";		to retrieve and represent many such native TE Topologies.
	// replace with IANA namespace when assigned
	prefix "tet";		3.2. Customized TE Topologies
	import ietf-yang-types {		The model discussed in this draft can be used to represent, retrieve
	prefix "yang";		and manipulate customized TE Topologies. The model allows the
	}		provider to present the network in abstract TE Terms on a per client
			basis. These customized topologies contain sufficient information
			for the path computing client to select paths according to its
			policies.
	import ietf-inet-types {		| +---+ /-\
	prefix "inet";		| | | Router ( ) WDM
	}		| +---+ Node \-/ node
			|
			o----------------------------_____
			__
			+---+ /-\ /-\ /-\ +---+
			| R1|-------( A )--------( C )---------( E )---------| R3|
			+---+ \-/ \-/ \-/ +---+
			/ \ / \
			/ \ / \
			/ \ / \
			/ \ / \
			/ \ / \
			+---+ /-\ /-\ /-\ +---+
			| R2|---------( B )---------( D )---------( F )---------| R4|
			+---+ \-/ \-/ \-/ +---+
	import ted {		Figure 3: Example packet optical topology
	prefix "ted";
	}
	import ietf-interfaces {		Consider the network topology depicted in Figure 3. This is a
	prefix "if";		typical packet optical transport deployment scenario where the WDM
	}		layer network domain serves as a Server Network Domain providing
			transport connectivity to the packet layer network Domain (Client
			Network Domain). Nodes R1, R2, R3 and R4 are IP routers that are
			connected to an Optical WDM transport network. A, B, C, D, E and F
			are WDM nodes that constitute the Server Network Domain.
	organization "TBD";		| ***** B-F WDM Path
	contact "TBD";		| @@@@@ B-E WDM Path
	description "TE topology model";		| $$$$$ A-E WDM Path
			o--------------------_
	revision "2015-03-23" {		+---+ /-\ $$$$$$$$ /-\ $$$$$$$$$ /-\ +---+
	description "Initial revision";		| R1|-------( A )--------( C )---------( E )---------| R3|
	reference "TBD";		+---+ \-/ @\-/ @@@@@@@@@ \-/ +---+
	}		@/ \ / \
			@/ \ / \
			@/ \ / \
			@/ \ / \
			@/ \ / \
			+---+ /-\ ********* /-\ ********* /-\ +---+
			| R2|---------( B )---------( D )---------( F )---------| R4|
			+---+ \-/ \-/ \-/ +---+
	/*		Figure 4a: Paths within the provider domain
	* Features
	*/
	feature te-topology-hierarchy {		++++++++ [A] ++++++++++++++++++++ [E] +++++++++
	description		+++++
	"This feature indicates that the system allows underlay		++++
	and/or overlay TE topology hierarchy.";		++++
	}		++++
			++++
			++++++++ [B] ++++++++++++++++++++ [F] +++++++++
	/*		Figure 4b: Customized TE Topology provided to the Client
	* Typedefs
	*/
	typedef te-topology-id {		[R1] ++++++++ [A] ++++++++++++++++++++ [E] +++++++++ [R3]
	type string {		+++++
	pattern '/?([a-zA-Z0-9\-_.]+)(/[a-zA-Z0-9\-_.]+)*';		++++
	}		++++
	description		++++
	"An identifier for a topology.";		++++
	}		[R2] ++++++++ [B] ++++++++++++++++++++ [F] +++++++++ [R4]
	typedef te-template-name {		Figure 4c: Customized TE Topology merged with the Client's Native TE
	type string {		Topology
	pattern '/?([a-zA-Z0-9\-_.]+)(/[a-zA-Z0-9\-_.]+)*';
	}
	description
	"A type for the name of a TE node template or TE link
	template.";
	}
	typedef te-node-id {		The goal here is to augment the Client TE Topology with a customized
	type inet:ip-address;		TE Topology provided by the WDM network. Given the availability of
	description		the paths A-E, B-F and B-E (Figure 4a), a customized TE Topology as
	"An identifier for a node in a topology.		depicted in Figure 4b is provided to the Client. This customized TE
	The identifier is represented as an IPv4 or IPv6 address.		Topology is merged with the Client's Native TE Topology and the
			resulting topology is depicted in Figure 4c.
	The identifier SHOULD be chosen such that the same node in a		The data model proposed in this document can be used to
	real network topology will always be identified through the		retrieve/represent/manipulate the customized TE Topology depicted in
	same identifier, even if the model is instantiated in		Figure 4b.
	separate datastores. An implementation MAY choose to capture
	semantics in the identifier, for example to indicate the type
	of node and/or the type of topology that the node is a part
	of.";
	}
	typedef te-link-id {		4. Modeling Considerations
	type union {
	type uint32; // Unnumbered
	type inet:ip-address; // IPv4 or IPv6 address
	}
	description
	"An identifier for a TE link on a node.
	The identifier may be opaque.
	The identifier SHOULD be chosen such that the same TP in a
	real network topology will always be identified through the
	same identifier, even if the model is instantiated in
	separate datastores. An implementation MAY choose to capture
	semantics in the identifier, for example to indicate the type
	of TP and/or the type of node and topology that the TP is a
	part of.";
	}
	typedef te-topology-event-type {		4.1. Generic extensible Model
	type enumeration {
	enum "add" {		The TE Topology model proposed in this document is meant to be
	value 0;		technology agnostic. Other technology specific TE Topology models
	description		can augment and use the building blocks provided by the proposed
	"A TE node or te-link has		model.
	been added";
	}		+-------------------+
	enum "remove" {		| Generic |
	value 1;		| TE Topology Model |
	description		+-------------------+
	"A TE node or te-link has		|
	been removed";		+-------------+-------------+-------------+
	}		| | | |
	enum "update" {		V V V V
	value 2;		+------------+ +------------+
	description		| Technology | | Technology |
	"A TE node or te-link has		| Specific | ...................... | Specific |
	been updated";		| TE Topology| | TE Topology|
	}		| Model 1 | | Model n |
			+------------+ +------------+
			Figure 5: Extending the generic model
			4.2. Model Structure
			The high-level model structure proposed by this document is as shown
			below:
			+--rw te-topologies
			| +--rw topology* [provider-id client-id te-topology-id]
			| | ..........
			| | +--rw node* [te-node-id]
			| | | ..........
			| | | +--rw te-link* [te-link-id]
			| | | ..........
			| | +--rw link* [source-te-node-id source-te-link-id dest-te-
			node-id dest-te-link-id]
			| | | ..........
			| +--rw node-template* [name] {template}?
			| | ..........
			| +--rw link-template* [name] {template}?
			| | ..........
			+--ro te-topologies-state
			+--ro topology* [provider-id client-id te-topology-id]
			| ..........
			+--ro node* [te-node-id]
			| | ..........
			| +--ro te-node-state
			| ..........
			+--ro link* [source-te-node-id source-te-link-id dest-te-
			node-id dest-te-link-id]
			| | ..........
			| +--ro te-link-state
			| ..........
			notifications:
			+---n te-node-event
			| ..........
			+---n te-link-event
			..........
			4.3. Topology Identifiers
			The TE-Topology is uniquely identified by a key that has 3
			constituents - te-topology-id, provider-id and client-id. The
			combination of provider-id and te-topology-id uniquely identifies a
			native TE Topology on a given provider. The client-id is used only
			when Customized TE Topologies come into play; a value of "0" is used
			as the client-id for native TE Topologies.
			+--rw topology* [provider-id client-id te-topology-id]
			| +--rw provider-id te-global-id
			| +--rw client-id te-global-id
			| +--rw te-topology-id te-topology-id
			4.4. Generic TE Link Attributes
			The model covers the definitions for generic TE Link attributes -
			bandwidth, admin groups, SRLGs, switching capabilities, TE metric
			extensions etc.
			+--rw te-link-attributes
			| ..........
			| +--rw performance-metric-throttle {te-performance-metric}?
			| | ..........
			| +--rw administrative-group? te-types:admin-groups
			| +--rw max-link-bandwidth? decimal64
			| +--rw max-resv-link-bandwidth? decimal64
			| +--rw unreserved-bandwidth* [priority]
			| | ..........
			| +--rw te-default-metric? uint32
			| +--rw performance-metric {te-performance-metric}?
			| | ..........
			| +--rw link-protection-type? enumeration
			| +--rw interface-switching-capabilities* [switching-capability]
			| | ..........
			| +--rw te-srlgs
			| | ..........
			4.5. Generic TE Node Attributes
			The model covers the definitions for generic TE Node attributes. The
			definition of a generic connectivity matrix is shown below:
			+--rw te-node-attributes
			| ..........
			| +--rw connectivity-matrix* [id]
			| +--rw id uint32
			| +--rw from-link
			| | +--rw provider-id-ref? leafref
			| | +--rw client-id-ref? leafref
			| | +--rw topology-id-ref? leafref
			| | +--rw node-ref? leafref
			| | +--rw link-end-ref? leafref
			| +--rw to-link
			| | +--rw provider-id-ref? leafref
			| | +--rw client-id-ref? leafref
			| | +--rw topology-id-ref? leafref
			| | +--rw node-ref? leafref
			| | +--rw link-end-ref? leafref
			| +--rw is-allowed? Boolean
			4.6. TED Information Sources
			The model allows each TE topological element to have multiple TE
			information sources (OSPF-TE, ISIS-TE, BGP-LS, User-Configured,
			System-Processed, Other). Each information source is associated with
			a credibility preference to indicate precedence. In scenarios where
			a customized TE Topology is merged into a Client's native TE
			Topology, the merged topological elements would point to the
			corresponding customized TE Topology as its information source.
			+--ro te-topologies-state
			+--ro topology* [provider-id client-id te-topology-id]
			| ..........
			+--ro node* [te-node-id]
			| ..........
			| +--ro te-node-state
			| +--ro information-source? enumeration
			| +--ro information-source-state
			| +--ro credibility-preference? uint16
			| +--ro topology
			| | +--ro provider-id-ref? leafref
			| | +--ro client-id-ref? leafref
			| | +--ro topology-id-ref? leafref
			| +--ro routing-instance? string
			+--ro te-topologies-state
			+--ro topology* [provider-id client-id te-topology-id]
			| ..........
			+--ro link* [source-te-node-id source-te-link-id dest-te-
			node-id dest-te-link-id]
			| ..........
			| +--ro te-link-state
			| +--ro information-source? enumeration
			| +--ro information-source-state
			| | +--ro credibility-preference? uint16
			| | +--ro topology
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | +--ro routing-instance? string
			| +--ro alt-information-sources* [information-source]
			| +--ro information-source
			enumeration
			| +--ro information-source-state
			| | +--ro credibility-preference? uint16
			| | +--ro topology
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | +--ro routing-instance? string
			| | ..........
			4.7. Overlay/Underlay Relationship
			The model captures overlay and underlay relationship for TE
			nodes/links. For example - in networks where multiple TE Topologies
			are built hierarchically, this model allows the user to start from a
			specific topological element in the top most topology and traverse
			all the way down to the supporting topological elements in the
			bottom most topology.
			This relationship is captured via the "underlay-topology" field for
			the node and via the "underlay" field for the link. The use of these
			fields is optional and this functionality is tagged as a "feature"
			("te-topology-hierarchy").
			+--rw node* [te-node-id]
			| ..........
			| +--rw te-node-attributes
			| | ..........
			| | +--rw underlay-topology {te-topology-hierarchy}?
			| | | +--rw provider-id-ref? leafref
			| | | +--rw client-id-ref? leafref
			| | | +--rw topology-id-ref? leafref
			+--rw link* [source-te-node-id source-te-link-id dest-te-node-id
			dest-te-link-id]
			| ..........
			| +--rw te-link-attributes
			| | .......
			| | +--rw underlay! {te-topology-hierarchy}?
			| | | +--rw underlay-primary-path
			| | | | +--rw provider-id-ref? leafref
			| | | | +--rw client-id-ref? leafref
			| | | | +--rw topology-id-ref? leafref
			| | | | +--rw path-element* [path-element-id]
			| | | | ..........
			| | | +--rw underlay-backup-path* [index]
			| | | | +--rw index uint32
			| | | | +--rw provider-id-ref? leafref
			| | | | +--rw client-id-ref? leafref
			| | | | +--rw topology-id-ref? leafref
			| | | | +--rw path-element* [path-element-id]
			| | | | ..........
			| | | +--rw underlay-protection-type? uint16
			| | | +--rw underlay-trail-src
			| | | ..........
			| | | +--rw underlay-trail-des
			| | | ..........
			4.8. Scheduling Parameters
			The model allows time scheduling parameters to be specified for each
			topological element or for the topology as a whole. These parameters
			allow the provider to present different topological views to the
			client at different time slots. The use of "scheduling parameters"
			is optional and this functionality is tagged as a "feature"
			("configuration-schedule"). [Editor's Note: The notion of
			"scheduling parameters" has wider applicability. The expectation is
			that this will eventually be discussed in a separate document.]
			+--rw schedules* [schedule-id] {configuration-schedule}?
			| +--rw schedule-id uint32
			| +--rw start? yang:date-and-time
			| +--rw schedule-duration? string
			| +--rw repeat-interval? string
			4.9. Templates
			The data model provides the users with the ability to define
			templates and apply them to link and node configurations. The use of
			"template" configuration is optional and this functionality is
			tagged as a "feature" ("template").
			+--rw topology* [provider-id client-id te-topology-id]
			| ...........
			| +--rw node* [te-node-id]
			| | +--rw te-node-template? leafref {template}?
			| | ..........
			| +--rw link* [source-te-node-id source-te-link-id dest-te-node-
			id dest-te-link-id]
			| +--rw te-link-template? leafref {template}?
			| ..........
			|
			+--rw node-template* [name] {template}?
			| +--rw name te-template-name
			| +--rw priority? uint16
			| +--rw reference-change-policy? enumeration
			| +--rw te-node-template* leafref
			| +--rw te-node-attributes
			| ..........
			+--rw link-template* [name] {template}?
			+--rw name te-template-name
			+--rw priority? uint16
			+--rw reference-change-policy? enumeration
			+--rw te-link-template* leafref
			+--rw te-link-attributes
			..........
			A template can be constructed using multiple other templates. When
			two or more templates specify values for the same configuration
			field, the value from the template with the highest priority is
			used. The reference-change-policy specifies the action that needs to
			be taken when the template changes on a configuration node that has
			a reference to this template. The choices of action include taking
			no action, rejecting the change to the template and applying the
			change to the corresponding configuration. [Editor's Note: The
			notion of "templates" has wider applicability. It is possible for
			this to be discussed in a separate document.]
			4.10. Notifications
			Notifications are a key component of any topology data model.
			[YANG-PUSH] defines a subscription and push mechanism for YANG
			datastores. This mechanism currently allows the user to:
			- Subscribe notifications on a per client basis
			- Specify subtree filters or xpath filters so that only interested
			contents will be sent.
			- Specify either periodic or on-demand notifications.
			The authors would like to recommend the use of this mechanism for
			the TE-Topology notifications. They would also like to suggest the
			following extensions to [YANG-PUSH]
			- Specify specific entities that will trigger the push
			notifications. These entities can be specified by xpath, like the
			way a filter is specified.
			- Specify or limit the triggering event type, e.g. "add", "delete",
			"modify", or "all". The system sends the push notifications only
			when such events happen on the triggering entities.
			- Have an option to request either "incremental" or "full"
			notifications for an entity. For "incremental", the notification
			will contain only the changed attributes.
			4.11. Open Items
			- Augmenting [YANG-NET-TOPO]: The generic network topology building
			blocks are discussed in [YANG-NET-TOPO]. This version of the
			document does not use any of those constructs. The next revision
			of this document should augment these constructs.
			- Coordinating changes to [YANG-PUSH]: The changes to [YANG-PUSH]
			discussed in Section 4.10 will need to be coordinated with the
			authors of that draft.
			5. Tree Structure
			module: ietf-te-topology
			+--rw te-topologies
			| +--rw topology* [provider-id client-id te-topology-id]
			| | +--rw provider-id te-global-id
			| | +--rw client-id te-global-id
			| | +--rw te-topology-id te-topology-id
			| | +--rw schedules* [schedule-id] {configuration-schedule}?
			| | | +--rw schedule-id uint32
			| | | +--rw start? yang:date-and-time
			| | | +--rw schedule-duration? string
			| | | +--rw repeat-interval? string
			| | +--rw topology-types
			| | | +--rw te-topology!
			| | +--rw node* [te-node-id]
			| | | +--rw te-node-id te-node-id
			| | | +--rw te-node-template? leafref {template}?
			| | | +--rw te-node-attributes
			| | | | +--rw schedules* [schedule-id] {configuration-
			schedule}?
			| | | | | +--rw schedule-id uint32
			| | | | | +--rw start? yang:date-and-time
			| | | | | +--rw schedule-duration? string
			| | | | | +--rw repeat-interval? string
			| | | | +--rw name? inet:domain-name
			| | | | +--rw signaling-address* inet:ip-address
			| | | | +--rw flag* flag-type
			| | | | +--rw is-abstract? boolean
			| | | | +--rw underlay-topology {te-topology-hierarchy}?
			| | | | | +--rw provider-id-ref? leafref
			| | | | | +--rw client-id-ref? leafref
			| | | | | +--rw topology-id-ref? leafref
			| | | | +--rw connectivity-matrix* [id]
			| | | | +--rw id uint32
			| | | | +--rw from-link
			| | | | | +--rw provider-id-ref? leafref
			| | | | | +--rw client-id-ref? leafref
			| | | | | +--rw topology-id-ref? leafref
			| | | | | +--rw node-ref? leafref
			| | | | | +--rw link-end-ref? leafref
			| | | | +--rw to-link
			| | | | | +--rw provider-id-ref? leafref
			| | | | | +--rw client-id-ref? leafref
			| | | | | +--rw topology-id-ref? leafref
			| | | | | +--rw node-ref? leafref
			| | | | | +--rw link-end-ref? leafref
			| | | | +--rw is-allowed? boolean
			| | | +--rw te-link* [te-link-id]
			| | | +--rw te-link-id te-link-id
			| | | +--rw (stack-level)?
			| | | +--:(bundle)
			| | | | +--rw bundled-links
			| | | | +--rw bundled-link* [sequence]
			| | | | +--rw sequence uint32
			| | | | +--rw te-link-ref? leafref
			| | | +--:(component)
			| | | +--rw component-links
			| | | +--rw component-link* [sequence]
			| | | +--rw sequence uint32
			| | | +--rw component-link-ref? leafref
			| | +--rw link* [source-te-node-id source-te-link-id dest-te-
			node-id dest-te-link-id]
			| | +--rw source-te-node-id leafref
			| | +--rw source-te-link-id leafref
			| | +--rw dest-te-node-id leafref
			| | +--rw dest-te-link-id leafref
			| | +--rw te-link-template? leafref {template}?
			| | +--rw te-link-attributes
			| | +--rw schedules* [schedule-id] {configuration-
			schedule}?
			| | | +--rw schedule-id uint32
			| | | +--rw start? yang:date-and-time
			| | | +--rw schedule-duration? string
			| | | +--rw repeat-interval? string
			| | +--rw name? string
			| | +--rw flag* flag-type
			| | +--rw is-abstract? boolean
			| | +--rw underlay! {te-topology-hierarchy}?
			| | | +--rw underlay-primary-path
			| | | | +--rw provider-id-ref? leafref
			| | | | +--rw client-id-ref? leafref
			| | | | +--rw topology-id-ref? leafref
			| | | | +--rw path-element* [path-element-id]
			| | | | +--rw path-element-id uint32
			| | | | +--rw (type)?
			| | | | +--:(ipv4-address)
			| | | | | +--rw v4-address? inet:ipv4-
			address
			| | | | | +--rw v4-prefix-length? uint8
			| | | | | +--rw v4-loose? boolean
			| | | | +--:(ipv6-address)
			| | | | | +--rw v6-address? inet:ipv6-
			address
			| | | | | +--rw v6-prefix-length? uint8
			| | | | | +--rw v6-loose? boolean
			| | | | +--:(as-number)
			| | | | | +--rw as-number? uint16
			| | | | +--:(unnumbered-link)
			| | | | | +--rw router-id? inet:ip-
			address
			| | | | | +--rw interface-id? uint32
			| | | | +--:(label)
			| | | | +--rw value? uint32
			| | | +--rw underlay-backup-path* [index]
			| | | | +--rw index uint32
			| | | | +--rw provider-id-ref? leafref
			| | | | +--rw client-id-ref? leafref
			| | | | +--rw topology-id-ref? leafref
			| | | | +--rw path-element* [path-element-id]
			| | | | +--rw path-element-id uint32
			| | | | +--rw (type)?
			| | | | +--:(ipv4-address)
			| | | | | +--rw v4-address? inet:ipv4-
			address
			| | | | | +--rw v4-prefix-length? uint8
			| | | | | +--rw v4-loose? boolean
			| | | | +--:(ipv6-address)
			| | | | | +--rw v6-address? inet:ipv6-
			address
			| | | | | +--rw v6-prefix-length? uint8
			| | | | | +--rw v6-loose? boolean
			| | | | +--:(as-number)
			| | | | | +--rw as-number? uint16
			| | | | +--:(unnumbered-link)
			| | | | | +--rw router-id? inet:ip-
			address
			| | | | | +--rw interface-id? uint32
			| | | | +--:(label)
			| | | | +--rw value? uint32
			| | | +--rw underlay-protection-type? uint16
			| | | +--rw underlay-trail-src
			| | | | +--rw provider-id-ref? leafref
			| | | | +--rw client-id-ref? leafref
			| | | | +--rw topology-id-ref? leafref
			| | | | +--rw node-ref? leafref
			| | | | +--rw link-end-ref? leafref
			| | | +--rw underlay-trail-des
			| | | +--rw provider-id-ref? leafref
			| | | +--rw client-id-ref? leafref
			| | | +--rw topology-id-ref? leafref
			| | | +--rw node-ref? leafref
			| | | +--rw link-end-ref? leafref
			| | +--rw admin-status? enumeration
			| | +--rw performance-metric-throttle {te-performance-
			metric}?
			| | | +--rw unidirectional-delay-offset?
			uint32
			| | | +--rw measure-interval?
			uint32
			| | | +--rw advertisement-interval?
			uint32
			| | | +--rw suppression-interval?
			uint32
			| | | +--rw threshold-out
			| | | | +--rw unidirectional-delay?
			uint32
			| | | | +--rw unidirectional-min-delay?
			uint32
			| | | | +--rw unidirectional-max-delay?
			uint32
			| | | | +--rw unidirectional-delay-variation?
			uint32
			| | | | +--rw unidirectional-packet-loss?
			decimal64
			| | | | +--rw unidirectional-residual-bandwidth?
			decimal64
			| | | | +--rw unidirectional-available-bandwidth?
			decimal64
			| | | | +--rw unidirectional-utilized-bandwidth?
			decimal64
			| | | +--rw threshold-in
			| | | | +--rw unidirectional-delay?
			uint32
			| | | | +--rw unidirectional-min-delay?
			uint32
			| | | | +--rw unidirectional-max-delay?
			uint32
			| | | | +--rw unidirectional-delay-variation?
			uint32
			| | | | +--rw unidirectional-packet-loss?
			decimal64
			| | | | +--rw unidirectional-residual-bandwidth?
			decimal64
			| | | | +--rw unidirectional-available-bandwidth?
			decimal64
			| | | | +--rw unidirectional-utilized-bandwidth?
			decimal64
			| | | +--rw threshold-accelerated-advertisement
			| | | +--rw unidirectional-delay?
			uint32
			| | | +--rw unidirectional-min-delay?
			uint32
			| | | +--rw unidirectional-max-delay?
			uint32
			| | | +--rw unidirectional-delay-variation?
			uint32
			| | | +--rw unidirectional-packet-loss?
			decimal64
			| | | +--rw unidirectional-residual-bandwidth?
			decimal64
			| | | +--rw unidirectional-available-bandwidth?
			decimal64
			| | | +--rw unidirectional-utilized-bandwidth?
			decimal64
			| | +--rw link-index? uint64
			| | +--rw administrative-group? te-
			types:admin-groups
			| | +--rw max-link-bandwidth? decimal64
			| | +--rw max-resv-link-bandwidth? decimal64
			| | +--rw unreserved-bandwidth* [priority]
			| | | +--rw priority uint8
			| | | +--rw bandwidth? decimal64
			| | +--rw te-default-metric? uint32
			| | +--rw performance-metric {te-performance-metric}?
			| | | +--rw measurement
			| | | | +--rw unidirectional-delay?
			uint32
			| | | | +--rw unidirectional-min-delay?
			uint32
			| | | | +--rw unidirectional-max-delay?
			uint32
			| | | | +--rw unidirectional-delay-variation?
			uint32
			| | | | +--rw unidirectional-packet-loss?
			decimal64
			| | | | +--rw unidirectional-residual-bandwidth?
			decimal64
			| | | | +--rw unidirectional-available-bandwidth?
			decimal64
			| | | | +--rw unidirectional-utilized-bandwidth?
			decimal64
			| | | +--rw normality
			| | | +--rw unidirectional-delay?
			performance-metric-normality
			| | | +--rw unidirectional-min-delay?
			performance-metric-normality
			| | | +--rw unidirectional-max-delay?
			performance-metric-normality
			| | | +--rw unidirectional-delay-variation?
			performance-metric-normality
			| | | +--rw unidirectional-packet-loss?
			performance-metric-normality
			| | | +--rw unidirectional-residual-bandwidth?
			performance-metric-normality
			| | | +--rw unidirectional-available-bandwidth?
			performance-metric-normality
			| | | +--rw unidirectional-utilized-bandwidth?
			performance-metric-normality
			| | +--rw link-protection-type? enumeration
			| | +--rw interface-switching-capabilities* [switching-
			capability]
			| | | +--rw switching-capability
			identityref
			| | | +--rw encoding?
			identityref
			| | | +--rw max-lsp-bandwidth* [priority]
			| | | | +--rw priority uint8
			| | | | +--rw bandwidth? decimal64
			| | | +--rw packet-switch-capable
			| | | | +--rw minimum-lsp-bandwidth? decimal64
			| | | | +--rw interface-mtu? uint16
			| | | +--rw time-division-multiplex-capable
			| | | +--rw minimum-lsp-bandwidth? decimal64
			| | | +--rw indication? enumeration
			| | +--rw te-srlgs
			| | +--rw values* te-types:srlg
			| +--rw node-template* [name] {template}?
			| | +--rw name te-template-name
			| | +--rw priority? uint16
			| | +--rw reference-change-policy? enumeration
			| | +--rw te-node-template* leafref
			| | +--rw te-node-attributes
			| | | +--rw schedules* [schedule-id] {configuration-schedule}?
			| | | | +--rw schedule-id uint32
			| | | | +--rw start? yang:date-and-time
			| | | | +--rw schedule-duration? string
			| | | | +--rw repeat-interval? string
			| | | +--rw name? inet:domain-name
			| | | +--rw signaling-address* inet:ip-address
			| | | +--rw flag* flag-type
			| | | +--rw is-abstract? boolean
			| | | +--rw underlay-topology {te-topology-hierarchy}?
			| | | | +--rw provider-id-ref? leafref
			| | | | +--rw client-id-ref? leafref
			| | | | +--rw topology-id-ref? leafref
			| | | +--rw connectivity-matrix* [id]
			| | | +--rw id uint32
			| | | +--rw from-link
			| | | | +--rw provider-id-ref? leafref
			| | | | +--rw client-id-ref? leafref
			| | | | +--rw topology-id-ref? leafref
			| | | | +--rw node-ref? leafref
			| | | | +--rw link-end-ref? leafref
			| | | +--rw to-link
			| | | | +--rw provider-id-ref? leafref
			| | | | +--rw client-id-ref? leafref
			| | | | +--rw topology-id-ref? leafref
			| | | | +--rw node-ref? leafref
			| | | | +--rw link-end-ref? leafref
			| | | +--rw is-allowed? boolean
			| | +--rw te-link* [te-link-id]
			| | +--rw te-link-id te-link-id
			| | +--rw (stack-level)?
			| | +--:(bundle)
			| | | +--rw bundled-links
			| | | +--rw bundled-link* [sequence]
			| | | +--rw sequence uint32
			| | | +--rw te-link-ref? leafref
			| | +--:(component)
			| | +--rw component-links
			| | +--rw component-link* [sequence]
			| | +--rw sequence uint32
			| | +--rw component-link-ref? leafref
			| +--rw link-template* [name] {template}?
			| +--rw name te-template-name
			| +--rw priority? uint16
			| +--rw reference-change-policy? enumeration
			| +--rw te-link-template* leafref
			| +--rw te-link-attributes
			| +--rw schedules* [schedule-id] {configuration-schedule}?
			| | +--rw schedule-id uint32
			| | +--rw start? yang:date-and-time
			| | +--rw schedule-duration? string
			| | +--rw repeat-interval? string
			| +--rw name? string
			| +--rw flag* flag-type
			| +--rw is-abstract? boolean
			| +--rw underlay! {te-topology-hierarchy}?
			| | +--rw underlay-primary-path
			| | | +--rw provider-id-ref? leafref
			| | | +--rw client-id-ref? leafref
			| | | +--rw topology-id-ref? leafref
			| | | +--rw path-element* [path-element-id]
			| | | +--rw path-element-id uint32
			| | | +--rw (type)?
			| | | +--:(ipv4-address)
			| | | | +--rw v4-address? inet:ipv4-
			address
			| | | | +--rw v4-prefix-length? uint8
			| | | | +--rw v4-loose? boolean
			| | | +--:(ipv6-address)
			| | | | +--rw v6-address? inet:ipv6-
			address
			| | | | +--rw v6-prefix-length? uint8
			| | | | +--rw v6-loose? boolean
			| | | +--:(as-number)
			| | | | +--rw as-number? uint16
			| | | +--:(unnumbered-link)
			| | | | +--rw router-id? inet:ip-address
			| | | | +--rw interface-id? uint32
			| | | +--:(label)
			| | | +--rw value? uint32
			| | +--rw underlay-backup-path* [index]
			| | | +--rw index uint32
			| | | +--rw provider-id-ref? leafref
			| | | +--rw client-id-ref? leafref
			| | | +--rw topology-id-ref? leafref
			| | | +--rw path-element* [path-element-id]
			| | | +--rw path-element-id uint32
			| | | +--rw (type)?
			| | | +--:(ipv4-address)
			| | | | +--rw v4-address? inet:ipv4-
			address
			| | | | +--rw v4-prefix-length? uint8
			| | | | +--rw v4-loose? boolean
			| | | +--:(ipv6-address)
			| | | | +--rw v6-address? inet:ipv6-
			address
			| | | | +--rw v6-prefix-length? uint8
			| | | | +--rw v6-loose? boolean
			| | | +--:(as-number)
			| | | | +--rw as-number? uint16
			| | | +--:(unnumbered-link)
			| | | | +--rw router-id? inet:ip-address
			| | | | +--rw interface-id? uint32
			| | | +--:(label)
			| | | +--rw value? uint32
			| | +--rw underlay-protection-type? uint16
			| | +--rw underlay-trail-src
			| | | +--rw provider-id-ref? leafref
			| | | +--rw client-id-ref? leafref
			| | | +--rw topology-id-ref? leafref
			| | | +--rw node-ref? leafref
			| | | +--rw link-end-ref? leafref
			| | +--rw underlay-trail-des
			| | +--rw provider-id-ref? leafref
			| | +--rw client-id-ref? leafref
			| | +--rw topology-id-ref? leafref
			| | +--rw node-ref? leafref
			| | +--rw link-end-ref? leafref
			| +--rw admin-status? enumeration
			| +--rw performance-metric-throttle {te-performance-
			metric}?
			| | +--rw unidirectional-delay-offset? uint32
			| | +--rw measure-interval? uint32
			| | +--rw advertisement-interval? uint32
			| | +--rw suppression-interval? uint32
			| | +--rw threshold-out
			| | | +--rw unidirectional-delay? uint32
			| | | +--rw unidirectional-min-delay? uint32
			| | | +--rw unidirectional-max-delay? uint32
			| | | +--rw unidirectional-delay-variation? uint32
			| | | +--rw unidirectional-packet-loss?
			decimal64
			| | | +--rw unidirectional-residual-bandwidth?
			decimal64
			| | | +--rw unidirectional-available-bandwidth?
			decimal64
			| | | +--rw unidirectional-utilized-bandwidth?
			decimal64
			| | +--rw threshold-in
			| | | +--rw unidirectional-delay? uint32
			| | | +--rw unidirectional-min-delay? uint32
			| | | +--rw unidirectional-max-delay? uint32
			| | | +--rw unidirectional-delay-variation? uint32
			| | | +--rw unidirectional-packet-loss?
			decimal64
			| | | +--rw unidirectional-residual-bandwidth?
			decimal64
			| | | +--rw unidirectional-available-bandwidth?
			decimal64
			| | | +--rw unidirectional-utilized-bandwidth?
			decimal64
			| | +--rw threshold-accelerated-advertisement
			| | +--rw unidirectional-delay? uint32
			| | +--rw unidirectional-min-delay? uint32
			| | +--rw unidirectional-max-delay? uint32
			| | +--rw unidirectional-delay-variation? uint32
			| | +--rw unidirectional-packet-loss?
			decimal64
			| | +--rw unidirectional-residual-bandwidth?
			decimal64
			| | +--rw unidirectional-available-bandwidth?
			decimal64
			| | +--rw unidirectional-utilized-bandwidth?
			decimal64
			| +--rw link-index? uint64
			| +--rw administrative-group? te-
			types:admin-groups
			| +--rw max-link-bandwidth? decimal64
			| +--rw max-resv-link-bandwidth? decimal64
			| +--rw unreserved-bandwidth* [priority]
			| | +--rw priority uint8
			| | +--rw bandwidth? decimal64
			| +--rw te-default-metric? uint32
			| +--rw performance-metric {te-performance-metric}?
			| | +--rw measurement
			| | | +--rw unidirectional-delay? uint32
			| | | +--rw unidirectional-min-delay? uint32
			| | | +--rw unidirectional-max-delay? uint32
			| | | +--rw unidirectional-delay-variation? uint32
			| | | +--rw unidirectional-packet-loss?
			decimal64
			| | | +--rw unidirectional-residual-bandwidth?
			decimal64
			| | | +--rw unidirectional-available-bandwidth?
			decimal64
			| | | +--rw unidirectional-utilized-bandwidth?
			decimal64
			| | +--rw normality
			| | +--rw unidirectional-delay?
			performance-metric-normality
			| | +--rw unidirectional-min-delay?
			performance-metric-normality
			| | +--rw unidirectional-max-delay?
			performance-metric-normality
			| | +--rw unidirectional-delay-variation?
			performance-metric-normality
			| | +--rw unidirectional-packet-loss?
			performance-metric-normality
			| | +--rw unidirectional-residual-bandwidth?
			performance-metric-normality
			| | +--rw unidirectional-available-bandwidth?
			performance-metric-normality
			| | +--rw unidirectional-utilized-bandwidth?
			performance-metric-normality
			| +--rw link-protection-type? enumeration
			| +--rw interface-switching-capabilities* [switching-
			capability]
			| | +--rw switching-capability identityref
			| | +--rw encoding? identityref
			| | +--rw max-lsp-bandwidth* [priority]
			| | | +--rw priority uint8
			| | | +--rw bandwidth? decimal64
			| | +--rw packet-switch-capable
			| | | +--rw minimum-lsp-bandwidth? decimal64
			| | | +--rw interface-mtu? uint16
			| | +--rw time-division-multiplex-capable
			| | +--rw minimum-lsp-bandwidth? decimal64
			| | +--rw indication? enumeration
			| +--rw te-srlgs
			| +--rw values* te-types:srlg
			+--ro te-topologies-state
			+--ro topology* [provider-id client-id te-topology-id]
			+--ro provider-id te-global-id
			+--ro client-id te-global-id
			+--ro te-topology-id te-topology-id
			+--ro server-provided? boolean
			+--ro topology-types
			| +--ro te-topology!
			+--ro node* [te-node-id]
			| +--ro te-node-id te-node-id
			| +--ro te-node-template? leafref {template}?
			| +--ro te-node-attributes
			| | +--ro schedules* [schedule-id] {configuration-
			schedule}?
			| | | +--ro schedule-id uint32
			| | | +--ro start? yang:date-and-time
			| | | +--ro schedule-duration? string
			| | | +--ro repeat-interval? string
			| | +--ro name? inet:domain-name
			| | +--ro signaling-address* inet:ip-address
			| | +--ro flag* flag-type
			| | +--ro is-abstract? boolean
			| | +--ro underlay-topology {te-topology-hierarchy}?
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | +--ro connectivity-matrix* [id]
			| | +--ro id uint32
			| | +--ro from-link
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro node-ref? leafref
			| | | +--ro link-end-ref? leafref
			| | +--ro to-link
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro node-ref? leafref
			| | | +--ro link-end-ref? leafref
			| | +--ro is-allowed? boolean
			| +--ro te-link* [te-link-id]
			| | +--ro te-link-id te-link-id
			| | +--ro (stack-level)?
			| | +--:(bundle)
			| | | +--ro bundled-links
			| | | +--ro bundled-link* [sequence]
			| | | +--ro sequence uint32
			| | | +--ro te-link-ref? leafref
			| | +--:(component)
			| | +--ro component-links
			| | +--ro component-link* [sequence]
			| | +--ro sequence uint32
			| | +--ro component-link-ref? leafref
			| +--ro te-node-state
			| +--ro information-source? enumeration
			| +--ro information-source-state
			| +--ro credibility-preference? uint16
			| +--ro topology
			| | +--ro provider-id-ref? leafref
			| | +--ro client-id-ref? leafref
			| | +--ro topology-id-ref? leafref
			| +--ro routing-instance? string
			+--ro link* [source-te-node-id source-te-link-id dest-te-
			node-id dest-te-link-id]
			+--ro source-te-node-id leafref
			+--ro source-te-link-id leafref
			+--ro dest-te-node-id leafref
			+--ro dest-te-link-id leafref
			+--ro te-link-template? leafref {template}?
			+--ro te-link-attributes
			| +--ro schedules* [schedule-id] {configuration-
			schedule}?
			| | +--ro schedule-id uint32
			| | +--ro start? yang:date-and-time
			| | +--ro schedule-duration? string
			| | +--ro repeat-interval? string
			| +--ro name? string
			| +--ro flag* flag-type
			| +--ro is-abstract? boolean
			| +--ro underlay! {te-topology-hierarchy}?
			| | +--ro underlay-primary-path
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro path-element* [path-element-id]
			| | | +--ro path-element-id uint32
			| | | +--ro (type)?
			| | | +--:(ipv4-address)
			| | | | +--ro v4-address? inet:ipv4-
			address
			| | | | +--ro v4-prefix-length? uint8
			| | | | +--ro v4-loose? boolean
			| | | +--:(ipv6-address)
			| | | | +--ro v6-address? inet:ipv6-
			address
			| | | | +--ro v6-prefix-length? uint8
			| | | | +--ro v6-loose? boolean
			| | | +--:(as-number)
			| | | | +--ro as-number? uint16
			| | | +--:(unnumbered-link)
			| | | | +--ro router-id? inet:ip-
			address
			| | | | +--ro interface-id? uint32
			| | | +--:(label)
			| | | +--ro value? uint32
			| | +--ro underlay-backup-path* [index]
			| | | +--ro index uint32
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro path-element* [path-element-id]
			| | | +--ro path-element-id uint32
			| | | +--ro (type)?
			| | | +--:(ipv4-address)
			| | | | +--ro v4-address? inet:ipv4-
			address
			| | | | +--ro v4-prefix-length? uint8
			| | | | +--ro v4-loose? boolean
			| | | +--:(ipv6-address)
			| | | | +--ro v6-address? inet:ipv6-
			address
			| | | | +--ro v6-prefix-length? uint8
			| | | | +--ro v6-loose? boolean
			| | | +--:(as-number)
			| | | | +--ro as-number? uint16
			| | | +--:(unnumbered-link)
			| | | | +--ro router-id? inet:ip-
			address
			| | | | +--ro interface-id? uint32
			| | | +--:(label)
			| | | +--ro value? uint32
			| | +--ro underlay-protection-type? uint16
			| | +--ro underlay-trail-src
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro node-ref? leafref
			| | | +--ro link-end-ref? leafref
			| | +--ro underlay-trail-des
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro node-ref? leafref
			| | | +--ro link-end-ref? leafref
			| | +--ro dynamic? boolean
			| | +--ro committed? boolean
			| +--ro admin-status? enumeration
			| +--ro performance-metric-throttle {te-performance-
			metric}?
			| | +--ro unidirectional-delay-offset?
			uint32
			| | +--ro measure-interval?
			uint32
			| | +--ro advertisement-interval?
			uint32
			| | +--ro suppression-interval?
			uint32
			| | +--ro threshold-out
			| | | +--ro unidirectional-delay?
			uint32
			| | | +--ro unidirectional-min-delay?
			uint32
			| | | +--ro unidirectional-max-delay?
			uint32
			| | | +--ro unidirectional-delay-variation?
			uint32
			| | | +--ro unidirectional-packet-loss?
			decimal64
			| | | +--ro unidirectional-residual-bandwidth?
			decimal64
			| | | +--ro unidirectional-available-bandwidth?
			decimal64
			| | | +--ro unidirectional-utilized-bandwidth?
			decimal64
			| | +--ro threshold-in
			| | | +--ro unidirectional-delay?
			uint32
			| | | +--ro unidirectional-min-delay?
			uint32
			| | | +--ro unidirectional-max-delay?
			uint32
			| | | +--ro unidirectional-delay-variation?
			uint32
			| | | +--ro unidirectional-packet-loss?
			decimal64
			| | | +--ro unidirectional-residual-bandwidth?
			decimal64
			| | | +--ro unidirectional-available-bandwidth?
			decimal64
			| | | +--ro unidirectional-utilized-bandwidth?
			decimal64
			| | +--ro threshold-accelerated-advertisement
			| | +--ro unidirectional-delay?
			uint32
			| | +--ro unidirectional-min-delay?
			uint32
			| | +--ro unidirectional-max-delay?
			uint32
			| | +--ro unidirectional-delay-variation?
			uint32
			| | +--ro unidirectional-packet-loss?
			decimal64
			| | +--ro unidirectional-residual-bandwidth?
			decimal64
			| | +--ro unidirectional-available-bandwidth?
			decimal64
			| | +--ro unidirectional-utilized-bandwidth?
			decimal64
			| +--ro link-index? uint64
			| +--ro administrative-group? te-
			types:admin-groups
			| +--ro max-link-bandwidth? decimal64
			| +--ro max-resv-link-bandwidth? decimal64
			| +--ro unreserved-bandwidth* [priority]
			| | +--ro priority uint8
			| | +--ro bandwidth? decimal64
			| +--ro te-default-metric? uint32
			| +--ro performance-metric {te-performance-metric}?
			| | +--ro measurement
			| | | +--ro unidirectional-delay?
			uint32
			| | | +--ro unidirectional-min-delay?
			uint32
			| | | +--ro unidirectional-max-delay?
			uint32
			| | | +--ro unidirectional-delay-variation?
			uint32
			| | | +--ro unidirectional-packet-loss?
			decimal64
			| | | +--ro unidirectional-residual-bandwidth?
			decimal64
			| | | +--ro unidirectional-available-bandwidth?
			decimal64
			| | | +--ro unidirectional-utilized-bandwidth?
			decimal64
			| | +--ro normality
			| | +--ro unidirectional-delay?
			performance-metric-normality
			| | +--ro unidirectional-min-delay?
			performance-metric-normality
			| | +--ro unidirectional-max-delay?
			performance-metric-normality
			| | +--ro unidirectional-delay-variation?
			performance-metric-normality
			| | +--ro unidirectional-packet-loss?
			performance-metric-normality
			| | +--ro unidirectional-residual-bandwidth?
			performance-metric-normality
			| | +--ro unidirectional-available-bandwidth?
			performance-metric-normality
			| | +--ro unidirectional-utilized-bandwidth?
			performance-metric-normality
			| +--ro link-protection-type? enumeration
			| +--ro interface-switching-capabilities* [switching-
			capability]
			| | +--ro switching-capability
			identityref
			| | +--ro encoding?
			identityref
			| | +--ro max-lsp-bandwidth* [priority]
			| | | +--ro priority uint8
			| | | +--ro bandwidth? decimal64
			| | +--ro packet-switch-capable
			| | | +--ro minimum-lsp-bandwidth? decimal64
			| | | +--ro interface-mtu? uint16
			| | +--ro time-division-multiplex-capable
			| | +--ro minimum-lsp-bandwidth? decimal64
			| | +--ro indication? enumeration
			| +--ro te-srlgs
			| +--ro values* te-types:srlg
			+--ro te-link-state
			+--ro oper-status? enumeration
			+--ro information-source? enumeration
			+--ro information-source-state
			| +--ro credibility-preference? uint16
			| +--ro topology
			| | +--ro provider-id-ref? leafref
			| | +--ro client-id-ref? leafref
			| | +--ro topology-id-ref? leafref
			| +--ro routing-instance? string
			+--ro alt-information-sources* [information-source]
			+--ro information-source
			enumeration
			+--ro information-source-state
			| +--ro credibility-preference? uint16
			| +--ro topology
			| | +--ro provider-id-ref? leafref
			| | +--ro client-id-ref? leafref
			| | +--ro topology-id-ref? leafref
			| +--ro routing-instance? string
			+--ro link-index? uint64
			+--ro administrative-group? te-
			types:admin-groups
			+--ro max-link-bandwidth?
			decimal64
			+--ro max-resv-link-bandwidth?
			decimal64
			+--ro unreserved-bandwidth* [priority]
			| +--ro priority uint8
			| +--ro bandwidth? decimal64
			+--ro te-default-metric? uint32
			+--ro performance-metric {te-performance-metric}?
			| +--ro measurement
			| | +--ro unidirectional-delay?
			uint32
			| | +--ro unidirectional-min-delay?
			uint32
			| | +--ro unidirectional-max-delay?
			uint32
			| | +--ro unidirectional-delay-variation?
			uint32
			| | +--ro unidirectional-packet-loss?
			decimal64
			| | +--ro unidirectional-residual-bandwidth?
			decimal64
			| | +--ro unidirectional-available-bandwidth?
			decimal64
			| | +--ro unidirectional-utilized-bandwidth?
			decimal64
			| +--ro normality
			| +--ro unidirectional-delay?
			performance-metric-normality
			| +--ro unidirectional-min-delay?
			performance-metric-normality
			| +--ro unidirectional-max-delay?
			performance-metric-normality
			| +--ro unidirectional-delay-variation?
			performance-metric-normality
			| +--ro unidirectional-packet-loss?
			performance-metric-normality
			| +--ro unidirectional-residual-bandwidth?
			performance-metric-normality
			| +--ro unidirectional-available-bandwidth?
			performance-metric-normality
			| +--ro unidirectional-utilized-bandwidth?
			performance-metric-normality
			+--ro link-protection-type?
			enumeration
			+--ro interface-switching-capabilities*
			[switching-capability]
			| +--ro switching-capability
			identityref
			| +--ro encoding?
			identityref
			| +--ro max-lsp-bandwidth* [priority]
			| | +--ro priority uint8
			| | +--ro bandwidth? decimal64
			| +--ro packet-switch-capable
			| | +--ro minimum-lsp-bandwidth? decimal64
			| | +--ro interface-mtu? uint16
			| +--ro time-division-multiplex-capable
			| +--ro minimum-lsp-bandwidth? decimal64
			| +--ro indication? enumeration
			+--ro te-srlgs
			+--ro values* te-types:srlg
			notifications:
			+---n te-node-event
			| +--ro event-type? te-topology-event-type
			| +--ro provider-id-ref? leafref
			| +--ro client-id-ref? leafref
			| +--ro topology-id-ref? leafref
			| +--ro node-ref? leafref
			| +--ro te-topology!
			| +--ro te-node-attributes
			| | +--ro schedules* [schedule-id] {configuration-schedule}?
			| | | +--ro schedule-id uint32
			| | | +--ro start? yang:date-and-time
			| | | +--ro schedule-duration? string
			| | | +--ro repeat-interval? string
			| | +--ro name? inet:domain-name
			| | +--ro signaling-address* inet:ip-address
			| | +--ro flag* flag-type
			| | +--ro is-abstract? boolean
			| | +--ro underlay-topology {te-topology-hierarchy}?
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | +--ro connectivity-matrix* [id]
			| | +--ro id uint32
			| | +--ro from-link
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro node-ref? leafref
			| | | +--ro link-end-ref? leafref
			| | +--ro to-link
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro node-ref? leafref
			| | | +--ro link-end-ref? leafref
			| | +--ro is-allowed? boolean
			| +--ro te-link* [te-link-id]
			| | +--ro te-link-id te-link-id
			| | +--ro (stack-level)?
			| | +--:(bundle)
			| | | +--ro bundled-links
			| | | +--ro bundled-link* [sequence]
			| | | +--ro sequence uint32
			| | | +--ro te-link-ref? leafref
			| | +--:(component)
			| | +--ro component-links
			| | +--ro component-link* [sequence]
			| | +--ro sequence uint32
			| | +--ro component-link-ref? leafref
			| +--ro te-node-state
			| +--ro information-source? enumeration
			| +--ro information-source-state
			| +--ro credibility-preference? uint16
			| +--ro topology
			| | +--ro provider-id-ref? leafref
			| | +--ro client-id-ref? leafref
			| | +--ro topology-id-ref? leafref
			| +--ro routing-instance? string
			+---n te-link-event
			+--ro event-type? te-topology-event-type
			+--ro provider-id-ref? leafref
			+--ro client-id-ref? leafref
			+--ro topology-id-ref? leafref
			+--ro source-te-node-id-ref? leafref
			+--ro source-te-link-id-ref? leafref
			+--ro dest-te-node-id-ref? leafref
			+--ro dest-te-link-id-ref? leafref
			+--ro te-topology!
			+--ro te-link-attributes
			| +--ro schedules* [schedule-id] {configuration-schedule}?
			| | +--ro schedule-id uint32
			| | +--ro start? yang:date-and-time
			| | +--ro schedule-duration? string
			| | +--ro repeat-interval? string
			| +--ro name? string
			| +--ro flag* flag-type
			| +--ro is-abstract? boolean
			| +--ro underlay! {te-topology-hierarchy}?
			| | +--ro underlay-primary-path
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro path-element* [path-element-id]
			| | | +--ro path-element-id uint32
			| | | +--ro (type)?
			| | | +--:(ipv4-address)
			| | | | +--ro v4-address? inet:ipv4-address
			| | | | +--ro v4-prefix-length? uint8
			| | | | +--ro v4-loose? boolean
			| | | +--:(ipv6-address)
			| | | | +--ro v6-address? inet:ipv6-address
			| | | | +--ro v6-prefix-length? uint8
			| | | | +--ro v6-loose? boolean
			| | | +--:(as-number)
			| | | | +--ro as-number? uint16
			| | | +--:(unnumbered-link)
			| | | | +--ro router-id? inet:ip-address
			| | | | +--ro interface-id? uint32
			| | | +--:(label)
			| | | +--ro value? uint32
			| | +--ro underlay-backup-path* [index]
			| | | +--ro index uint32
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro path-element* [path-element-id]
			| | | +--ro path-element-id uint32
			| | | +--ro (type)?
			| | | +--:(ipv4-address)
			| | | | +--ro v4-address? inet:ipv4-address
			| | | | +--ro v4-prefix-length? uint8
			| | | | +--ro v4-loose? boolean
			| | | +--:(ipv6-address)
			| | | | +--ro v6-address? inet:ipv6-address
			| | | | +--ro v6-prefix-length? uint8
			| | | | +--ro v6-loose? boolean
			| | | +--:(as-number)
			| | | | +--ro as-number? uint16
			| | | +--:(unnumbered-link)
			| | | | +--ro router-id? inet:ip-address
			| | | | +--ro interface-id? uint32
			| | | +--:(label)
			| | | +--ro value? uint32
			| | +--ro underlay-protection-type? uint16
			| | +--ro underlay-trail-src
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro node-ref? leafref
			| | | +--ro link-end-ref? leafref
			| | +--ro underlay-trail-des
			| | | +--ro provider-id-ref? leafref
			| | | +--ro client-id-ref? leafref
			| | | +--ro topology-id-ref? leafref
			| | | +--ro node-ref? leafref
			| | | +--ro link-end-ref? leafref
			| | +--ro dynamic? boolean
			| | +--ro committed? boolean
			| +--ro admin-status? enumeration
			| +--ro performance-metric-throttle {te-performance-metric}?
			| | +--ro unidirectional-delay-offset? uint32
			| | +--ro measure-interval? uint32
			| | +--ro advertisement-interval? uint32
			| | +--ro suppression-interval? uint32
			| | +--ro threshold-out
			| | | +--ro unidirectional-delay? uint32
			| | | +--ro unidirectional-min-delay? uint32
			| | | +--ro unidirectional-max-delay? uint32
			| | | +--ro unidirectional-delay-variation? uint32
			| | | +--ro unidirectional-packet-loss? decimal64
			| | | +--ro unidirectional-residual-bandwidth? decimal64
			| | | +--ro unidirectional-available-bandwidth? decimal64
			| | | +--ro unidirectional-utilized-bandwidth? decimal64
			| | +--ro threshold-in
			| | | +--ro unidirectional-delay? uint32
			| | | +--ro unidirectional-min-delay? uint32
			| | | +--ro unidirectional-max-delay? uint32
			| | | +--ro unidirectional-delay-variation? uint32
			| | | +--ro unidirectional-packet-loss? decimal64
			| | | +--ro unidirectional-residual-bandwidth? decimal64
			| | | +--ro unidirectional-available-bandwidth? decimal64
			| | | +--ro unidirectional-utilized-bandwidth? decimal64
			| | +--ro threshold-accelerated-advertisement
			| | +--ro unidirectional-delay? uint32
			| | +--ro unidirectional-min-delay? uint32
			| | +--ro unidirectional-max-delay? uint32
			| | +--ro unidirectional-delay-variation? uint32
			| | +--ro unidirectional-packet-loss? decimal64
			| | +--ro unidirectional-residual-bandwidth? decimal64
			| | +--ro unidirectional-available-bandwidth? decimal64
			| | +--ro unidirectional-utilized-bandwidth? decimal64
			| +--ro link-index? uint64
			| +--ro administrative-group? te-types:admin-
			groups
			| +--ro max-link-bandwidth? decimal64
			| +--ro max-resv-link-bandwidth? decimal64
			| +--ro unreserved-bandwidth* [priority]
			| | +--ro priority uint8
			| | +--ro bandwidth? decimal64
			| +--ro te-default-metric? uint32
			| +--ro performance-metric {te-performance-metric}?
			| | +--ro measurement
			| | | +--ro unidirectional-delay? uint32
			| | | +--ro unidirectional-min-delay? uint32
			| | | +--ro unidirectional-max-delay? uint32
			| | | +--ro unidirectional-delay-variation? uint32
			| | | +--ro unidirectional-packet-loss? decimal64
			| | | +--ro unidirectional-residual-bandwidth? decimal64
			| | | +--ro unidirectional-available-bandwidth? decimal64
			| | | +--ro unidirectional-utilized-bandwidth? decimal64
			| | +--ro normality
			| | +--ro unidirectional-delay?
			performance-metric-normality
			| | +--ro unidirectional-min-delay?
			performance-metric-normality
			| | +--ro unidirectional-max-delay?
			performance-metric-normality
			| | +--ro unidirectional-delay-variation?
			performance-metric-normality
			| | +--ro unidirectional-packet-loss?
			performance-metric-normality
			| | +--ro unidirectional-residual-bandwidth?
			performance-metric-normality
			| | +--ro unidirectional-available-bandwidth?
			performance-metric-normality
			| | +--ro unidirectional-utilized-bandwidth?
			performance-metric-normality
			| +--ro link-protection-type? enumeration
			| +--ro interface-switching-capabilities* [switching-
			capability]
			| | +--ro switching-capability identityref
			| | +--ro encoding? identityref
			| | +--ro max-lsp-bandwidth* [priority]
			| | | +--ro priority uint8
			| | | +--ro bandwidth? decimal64
			| | +--ro packet-switch-capable
			| | | +--ro minimum-lsp-bandwidth? decimal64
			| | | +--ro interface-mtu? uint16
			| | +--ro time-division-multiplex-capable
			| | +--ro minimum-lsp-bandwidth? decimal64
			| | +--ro indication? enumeration
			| +--ro te-srlgs
			| +--ro values* te-types:srlg
			+--ro te-link-state
			+--ro oper-status? enumeration
			+--ro information-source? enumeration
			+--ro information-source-state
			| +--ro credibility-preference? uint16
			| +--ro topology
			| | +--ro provider-id-ref? leafref
			| | +--ro client-id-ref? leafref
			| | +--ro topology-id-ref? leafref
			| +--ro routing-instance? string
			+--ro alt-information-sources* [information-source]
			+--ro information-source enumeration
			+--ro information-source-state
			| +--ro credibility-preference? uint16
			| +--ro topology
			| | +--ro provider-id-ref? leafref
			| | +--ro client-id-ref? leafref
			| | +--ro topology-id-ref? leafref
			| +--ro routing-instance? string
			+--ro link-index? uint64
			+--ro administrative-group? te-
			types:admin-groups
			+--ro max-link-bandwidth? decimal64
			+--ro max-resv-link-bandwidth? decimal64
			+--ro unreserved-bandwidth* [priority]
			| +--ro priority uint8
			| +--ro bandwidth? decimal64
			+--ro te-default-metric? uint32
			+--ro performance-metric {te-performance-metric}?
			| +--ro measurement
			| | +--ro unidirectional-delay? uint32
			| | +--ro unidirectional-min-delay? uint32
			| | +--ro unidirectional-max-delay? uint32
			| | +--ro unidirectional-delay-variation? uint32
			| | +--ro unidirectional-packet-loss?
			decimal64
			| | +--ro unidirectional-residual-bandwidth?
			decimal64
			| | +--ro unidirectional-available-bandwidth?
			decimal64
			| | +--ro unidirectional-utilized-bandwidth?
			decimal64
			| +--ro normality
			| +--ro unidirectional-delay?
			performance-metric-normality
			| +--ro unidirectional-min-delay?
			performance-metric-normality
			| +--ro unidirectional-max-delay?
			performance-metric-normality
			| +--ro unidirectional-delay-variation?
			performance-metric-normality
			| +--ro unidirectional-packet-loss?
			performance-metric-normality
			| +--ro unidirectional-residual-bandwidth?
			performance-metric-normality
			| +--ro unidirectional-available-bandwidth?
			performance-metric-normality
			| +--ro unidirectional-utilized-bandwidth?
			performance-metric-normality
			+--ro link-protection-type? enumeration
			+--ro interface-switching-capabilities* [switching-
			capability]
			| +--ro switching-capability identityref
			| +--ro encoding? identityref
			| +--ro max-lsp-bandwidth* [priority]
			| | +--ro priority uint8
			| | +--ro bandwidth? decimal64
			| +--ro packet-switch-capable
			| | +--ro minimum-lsp-bandwidth? decimal64
			| | +--ro interface-mtu? uint16
			| +--ro time-division-multiplex-capable
			| +--ro minimum-lsp-bandwidth? decimal64
			| +--ro indication? enumeration
			+--ro te-srlgs
			+--ro values* te-types:srlg
			6. TE Topology Yang Module
			<CODE BEGINS>
			module ietf-te-topology {
			yang-version 1;
			namespace "urn:ietf:params:xml:ns:yang:ietf-te-topology";
			// replace with IANA namespace when assigned
			prefix "tet";
			import ietf-yang-types {
			prefix "yang";
	}		}
	description "TE Event type for notifications";
	} // te-topology-event-type
	/*		import ietf-inet-types {
	* Identities		prefix "inet";
	*/		}
	identity flag-identity {		import ietf-interfaces {
	description "Base type for flags";		prefix "if";
	}		}
			import ietf-te-types {
			prefix "te-types";
			}
	identity undefined-flag {		organization "TBD";
	base "flag-identity";		contact "TBD";
	description "Undefined flag";		description "TE topology model";
	}
	typedef flag-type {		revision "2015-07-02" {
	type identityref {		description "Initial revision";
	base "flag-identity";		reference "TBD";
	}		}
	description "Type for flags";
	}
	/*		/*
	* Groupings		* Features
	*/		*/
	grouping topo-ref {		feature te-topology-hierarchy {
	description
	"Grouping for an absolute reference to a topology instance.";
	leaf topo-ref {
	type leafref {
	path "/tet:te-topologies/tet:topology/tet:te-topology-id";
	}
	description		description
	"An absolute reference to a topology instance.";		"This feature indicates that the system allows underlay
			and/or overlay TE topology hierarchy.";
	}		}
	}
	grouping link-ref {
	description
	"Grouping for an absolute reference to a link instance.";
	uses topo-ref;
	leaf source-te-node-id-ref {
	type leafref {
	path "/tet:te-topologies/tet:topology"
	+"[tet:te-topology-id = current()/../topo-ref]"
	+"/tet:link/tet:source-te-node-id";
	}		feature te-performance-metric {
	description		description
	"An absolute reference to a link instance.";		"This feature indicates that the system supports
			TE performance metric defined in
			draft-ietf-ospf-te-metric-extensions.";
	}		}
	leaf source-te-link-id-ref {
	type leafref {		feature configuration-schedule {
	path "/tet:te-topologies/tet:topology"
	+"[tet:te-topology-id = current()/../topo-ref]"
	+"/tet:link/tet:source-te-link-id";
	}
	description		description
	"An absolute reference to a link instance.";		"This feature indicates that the system supports
			configuration scheduling.";
	}		}
	leaf dest-te-node-id-ref {
	type leafref {		feature template {
	path "/tet:te-topologies/tet:topology"
	+"[tet:te-topology-id = current()/../topo-ref]"
	+"/tet:link/tet:dest-te-node-id";
	}
	description		description
	"An absolute reference to a link instance.";		"This feature indicates that the system supports
			template configuration.";
	}		}
	leaf dest-te-link-id-ref {
	type leafref {		/*
	path "/tet:te-topologies/tet:topology"		* Typedefs
	+"[tet:te-topology-id = current()/../topo-ref]"		*/
	+"/tet:link/tet:dest-te-link-id";
	}		typedef te-global-id {
			type uint32;
	description		description
	"An absolute reference to a link instance.";		"An identifier to uniquely identify an operator, which can be
			either a provider or a client.
			The definition of this type is taken from RFC6370 and RFC503.
			This attribute type is used solely to provide a globally
			unique context for TE topologies.";
	}		}
	}
	grouping node-ref {		typedef te-topology-id {
	description		type string {
	"Grouping for an absolute reference to a node instance.";		pattern '/?([a-zA-Z0-9\-_.]+)(/[a-zA-Z0-9\-_.]+)*';
	uses topo-ref;
	leaf node-ref {
	type leafref {
	path "/tet:te-topologies/tet:topology"
	+"[tet:te-topology-id = current()/../topo-ref]"
	+"/tet:node/tet:te-node-id";
	}		}
	description		description
	"An absolute reference to a node instance.";		"An identifier for a topology.";
	}		}
	}
	grouping link-end-ref {		typedef te-template-name {
	description		type string {
	"Grouping for an absolute reference to a TE link end, which is		pattern '/?([a-zA-Z0-9\-_.]+)(/[a-zA-Z0-9\-_.]+)*';
	the local representation of a TE link on a node.";
	uses node-ref;
	leaf link-end-ref {
	type leafref {
	path "/tet:te-topologies/tet:topology"
	+"[tet:te-topology-id = current()/../topo-ref]"
	+"/tet:node[tet:te-node-id = current()/../node-ref]"
	+"/tet:te-node-attributes/tet:te-link/tet:te-link-id";
	}		}
	description		description
	"Grouping for an absolute reference to a TE link end.";		"A type for the name of a TE node template or TE link
			template.";
	}		}
	}
	grouping te-topology-type {		typedef te-node-id {
	description		type inet:ip-address;
	"Identifies the TE topology type.";
	container te-topology {
	presence "indicates TE topology";
	description		description
	"Its presence identifies the TE topology type.";		"An identifier for a node in a topology.
			The identifier is represented as an IPv4 or IPv6 address.
			The identifier SHOULD be chosen such that the same node in a
			real network topology will always be identified through the
			same identifier, even if the model is instantiated in
			separate
			datastores. An implementation MAY choose to capture semantics
			in the identifier, for example to indicate the type of node
			and/or the type of topology that the node is a part of.";
	}		}
	}
	grouping te-path-element {		typedef te-link-id {
	description		type union {
	"A group of attributes defining an element in a TE path		type uint32; // Unnumbered
	such as TE node, TE link, TE aotomic resource or label.";		type inet:ip-address; // IPv4 or IPv6 address
	leaf loose {		}
	type boolean;		description
	description "true if the element is loose.";		"An identifier for a TE link on a node.
			The identifier may be opaque.
			The identifier SHOULD be chosen such that the same TP in a
			real network topology will always be identified through the
			same identifier, even if the model is instantiated in
			separate
			datastores. An implementation MAY choose to capture semantics
			in the identifier, for example to indicate the type of TP
			and/or the type of node and topology that the TP is a part
			of.";
	}		}
	choice element-type {
	description "Attributes for various element types.";		typedef te-topology-event-type {
	case numbered-link {		type enumeration {
	leaf link-ip-address {		enum "add" {
	type inet:ip-address;		value 0;
	description "IPv4 or IPv6 address.";		description
			"A TE node or te-link has
			been added";
	}		}
	}		enum "remove" {
	case unnumbered-link {		value 1;
	leaf link-node-id {
	type uint32;
	description		description
	"Node ID of the node where the link end point resides.";		"A TE node or te-link has
			been removed";
	}		}
	leaf te-link-id {		enum "update" {
	type uint32;		value 2;
	description "Identifies the link end point.";		description
			"A TE node or te-link has
			been updated";
	}		}
	}		}
	case node {		description "TE Event type for notifications";
	leaf te-node-id {		} // te-topology-event-type
	type uint32;
	description "Identifies the node.";		typedef performance-metric-normality {
			type enumeration {
			enum "unknown" {
			value 0;
			description
			"Unknown";
	}		}
	}		enum "normal" {
	case label {		value 1;
	leaf label {		description
	type uint32;		"Normal";
	description "Identifies atomic TE resource or label.";		}
			enum "abnormal" {
			value 2;
			description
			"Abnormal. The anomalous bit is set.";
	}		}
	}		}
			description
			"Indicates whether a performance metric is normal, abnormal,
			or unknown.";
	}		}
	} // te-path-element
	grouping config-schedule-attributes {		/*
	description		* Identities
	"A list of schedules defining when a particular		*/
	configuration takes effect.";
	list schedules {
	key "schedule-id";
	description "A list of schedule elements.";
	leaf schedule-id {		identity flag-identity {
	type uint32;		description "Base type for flags";
	description "Identifies the schedule element.";		}
			identity undefined-flag {
			base "flag-identity";
			description "Undefined flag";
			}
			typedef flag-type {
			type identityref {
			base "flag-identity";
	}		}
	leaf start {		description "Type for flags";
	type yang:date-and-time;		}
	description "Start time.";
			/*
			* Groupings
			*/
			grouping topo-ref {
			description
			"Grouping for an absolute reference to a topology instance.";
			leaf provider-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology/tet:provider-id";
			}
			description
			"An absolute reference to a provider-id.";
	}		}
	leaf schedule-duration {		leaf client-id-ref {
	type string {		type leafref {
	pattern		path "/tet:te-topologies/tet:topology/tet:client-id";
	'P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?(\d+S)?';
	}		}
	description "Schedule duration in ISO 8601 format.";		description
			"An absolute reference to a client-id.";
	}		}
	leaf repeat-interval {		leaf topology-id-ref {
	type string {		type leafref {
	pattern		path "/tet:te-topologies/tet:topology/tet:te-topology-id";
	'R\d*/P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?'
	+ '(\d+S)?';
	}		}
	description "Repeat interval in ISO 8601 format.";		description
	}		"An absolute reference to a te-topology-id.";
	}		}
	}		} // topo-ref
	grouping information-source-attributes {		grouping link-ref {
	description		description
	"The attributes identifying source that has provided the		"Grouping for an absolute reference to a link instance.";
	related information, and the source credibility.";		uses topo-ref;
	leaf information-source {		leaf source-te-node-id-ref {
	type enumeration {		type leafref {
	enum "unknown" {		path "/tet:te-topologies/tet:topology"
	description "The source is unknown";		+"[tet:provider-id = current()/../provider-id-ref]"
			+"[tet:client-id = current()/../client-id-ref]"
			+"[tet:te-topology-id = current()/../topology-id-ref]"
			+"/tet:link/tet:source-te-node-id";
	}		}
	enum "locally-configured" {		description
	description "Configured TE link";		"An absolute reference to a link instance.";
			}
			leaf source-te-link-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology"
			+"[tet:provider-id = current()/../provider-id-ref]"
			+"[tet:client-id = current()/../client-id-ref]"
			+"[tet:te-topology-id = current()/../topology-id-ref]"
			+"/tet:link/tet:source-te-link-id";
	}		}
	enum "ospfv2" {		description
	description "OSPFv2";		"An absolute reference to a link instance.";
			}
			leaf dest-te-node-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology"
			+"[tet:provider-id = current()/../provider-id-ref]"
			+"[tet:client-id = current()/../client-id-ref]"
			+"[tet:te-topology-id = current()/../topology-id-ref]"
			+"/tet:link/tet:dest-te-node-id";
	}		}
	enum "ospfv3" {		description
	description "OSPFv3";		"An absolute reference to a link instance.";
			}
			leaf dest-te-link-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology"
			+"[tet:provider-id = current()/../provider-id-ref]"
			+"[tet:client-id = current()/../client-id-ref]"
			+"[tet:te-topology-id = current()/../topology-id-ref]"
			+"/tet:link/tet:dest-te-link-id";
	}		}
	enum "isis" {		description
	description "ISIS";		"An absolute reference to a link instance.";
			}
			} // link-ref
			grouping node-ref {
			description
			"Grouping for an absolute reference to a node instance.";
			uses topo-ref;
			leaf node-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology"
			+"[tet:provider-id = current()/../provider-id-ref]"
			+"[tet:client-id = current()/../client-id-ref]"
			+"[tet:te-topology-id = current()/../topology-id-ref]"
			+"/tet:node/tet:te-node-id";
	}		}
	enum "other" {		description
	description "Other source";		"An absolute reference to a node instance.";
			}
			} // node-ref
			grouping link-end-ref {
			description
			"Grouping for an absolute reference to a TE link end, which is
			the local representation of a TE link on a node.";
			uses node-ref;
			leaf link-end-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology"
			+"[tet:provider-id = current()/../provider-id-ref]"
			+"[tet:client-id = current()/../client-id-ref]"
			+"[tet:te-topology-id = current()/../topology-id-ref]"
			+"/tet:node[tet:te-node-id = current()/../node-ref]"
			+"/tet:te-link/tet:te-link-id";
	}		}
			description
			"Grouping for an absolute reference to a TE link end.";
	}		}
			} // link-end-ref
			grouping te-topology-type {
	description		description
	"Indicates the source of the information.";		"Identifies the TE topology type.";
	}		container te-topology {
	leaf credibility-preference {		presence "indicates TE topology";
	type uint16;		description
			"Its presence identifies the TE topology type.";
			}
			} // te-topology-type
			grouping te-path-element {
	description		description
	"The preference value to calculate the traffic		"A group of attributes defining an element in a TE path
	engineering database credibility value used for		such as TE node, TE link, TE atomic resource or label.";
	tie-break selection between different		uses te-types:explicit-route-subobject;
	information-source values.		} // te-path-element
	Higher value is more preferable.";
	}
	}
	grouping te-node-attributes {		grouping config-schedule-attributes {
	description "Node attributes in a TE topology.";		description
	container te-node-attributes {		"A list of schedules defining when a particular
	description "Node attributes in a TE topology.";		configuration takes effect.";
	uses config-schedule-attributes;		list schedules {
	leaf name {		if-feature configuration-schedule;
	type inet:domain-name;		key "schedule-id";
	description "Node name.";		description "A list of schedule elements.";
	}
	leaf-list signaling-address {		leaf schedule-id {
	type inet:ip-address;		type uint32;
	description "Node signaling address.";		description "Identifies the schedule element.";
			}
			leaf start {
			type yang:date-and-time;
			description "Start time.";
			}
			leaf schedule-duration {
			type string {
			pattern
			'P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?(\d+S)?';
			}
			description "Schedule duration in ISO 8601 format.";
			}
			leaf repeat-interval {
			type string {
			pattern
			'R\d*/P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?'
			+ '(\d+S)?';
			}
			description "Repeat interval in ISO 8601 format.";
			}
	}		}
	leaf-list flag {		} // config-schedule-attributes
	type flag-type;
	description "Node operational flags.";		grouping information-source-attributes {
			description
			"The attributes identifying source that has provided the
			related information, and the source credibility.";
			leaf information-source {
			type enumeration {
			enum "unknown" {
			description "The source is unknown";
			}
			enum "locally-configured" {
			description "Configured entity";
			}
			enum "ospfv2" {
			description "OSPFv2";
			}
			enum "ospfv3" {
			description "OSPFv3";
			}
			enum "isis" {
			description "ISIS";
			}
			enum "system-processed" {
			description "System processed entity.";
			}
			enum "other" {
			description "Other source";
			}
			}
			description
			"Indicates the source of the information.";
	}		}
	leaf is-abstract {		container information-source-state {
	type boolean;
	description		description
	"true if the node is abstract, false when the node is		"The container contains state attributes related to
	actual.";		the information source.";
			leaf credibility-preference {
			type uint16;
			description
			"The preference value to calculate the traffic
			engineering database credibility value used for
			tie-break selection between different
			information-source values.
			Higher value is more preferable.";
			}
			container topology {
			description
			"When the information is processed by the system,
			the attributes in this container indicate which topology
			is used to process to generate the result information.";
			leaf provider-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology/tet:provider-id";
			}
			description
			"A reference to a provider-id.";
			}
			leaf client-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology/tet:client-id";
			}
			description
			"A reference to a client-id.";
			}
			leaf topology-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology"
			+"/tet:te-topology-id";
			}
			description
			"A reference to a te-topology-id.";
			}
			} // topology
			leaf routing-instance {
			type string;
			description
			"When applicable, this is the name of a routing instance
			from which the information is learned.";
			} // routing-information
	}		}
	leaf underlay-topology {		} // information-source-attributes
	if-feature te-topology-hierarchy;
	type leafref {		grouping te-node-attributes {
	path "/tet:te-topologies/tet:topology/tet:te-topology-id";		description "Node attributes in a TE topology.";
			container te-node-attributes {
			description "Node attributes in a TE topology.";
			uses config-schedule-attributes;
			leaf name {
			type inet:domain-name;
			description "Node name.";
			}
			leaf-list signaling-address {
			type inet:ip-address;
			description "Node signaling address.";
			}
			leaf-list flag {
			type flag-type;
			description "Node operational flags.";
			}
			leaf is-abstract {
			type boolean;
			description
			"true if the node is abstract, false when the node is
			actual.";
			}
			container underlay-topology {
			if-feature te-topology-hierarchy;
			description
			"When an abstract node encapsulates a topology,
			the attributes in this container point to said topology.";
			leaf provider-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology/tet:provider-id";
			}
			description
			"A reference to a provider-id.";
			}
			leaf client-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology/tet:client-id";
			}
			description
			"A reference to a client-id.";
			}
			leaf topology-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology"
			+"/tet:te-topology-id";
			}
			description
			"A reference to a te-topology-id.";
			}
			}
			list connectivity-matrix {
			key "id";
			description
			"Represents node's switching limitations, i.e. limitations
			in interconnecting network TE links across the node.";
			leaf id {
			type uint32;
			description "Identifies the connectivity-matrix entry.";
			}
			container from-link {
			uses tet:link-end-ref;
			description
			"Reference to source NTP.";
			}
			container to-link {
			uses tet:link-end-ref;
			description
			"Reference to destination NTP.";
			}
			leaf is-allowed {
			type boolean;
			description
			"true - switching is allowed,
			false - switching is disallowed.";
			}
	}		}
	description
	"When an abstract node encapsulates a topology,
	this reference points to said topology.";
	}		}
	list te-link {		list te-link {
	key "te-link-id";		key "te-link-id";
	description		description
	"The local representation of a TE link, which		"The local representation of a TE link, which
	interconnect TE nodes.";		interconnect TE nodes.";
	leaf te-link-id {		leaf te-link-id {
	type te-link-id;		type te-link-id;
	description		description
	"TE link identifier.";		"TE link identifier.";
	}		}
	choice stack-level {		choice stack-level {
	description		description
	"The TE link can be partitioned into bundled		"The TE link can be partitioned into bundled
	links, or component links.";		links, or component links.";
	case bundle {		case bundle {
	container bundled-links {		container bundled-links {
	description		description
	"A set of bundled links";		"A set of bundled links";
	list bundled-link {		list bundled-link {
	key "sequence";		key "sequence";
	description		description
	"Specify a bundled interfface that is		"Specify a bundled interface that is
	further partitioned.";		further partitioned.";
	leaf sequence {		leaf sequence {
	type uint32;		type uint32;
	description		description
	"Identify the sequence in the bundle.";		"Identify the sequence in the bundle.";
	}		}
	leaf te-link-ref {		leaf te-link-ref {
	type leafref {		type leafref {
	path "../../../te-link-id";		path "../../../te-link-id";
	require-instance "true";		require-instance true;
	}		}
	description		description
	"Reference to TE link on this node.";		"Reference to TE link on this node.";
	}		}
	}		}
	}		}
	}		}
	case component {		case component {
	container component-links {		container component-links {
	description		description
	"A set of component links";		"A set of component links";
	list component-link {		list component-link {
	key "sequence";		key "sequence";
	description		description
	"Specify a component interfface that is		"Specify a component interface that is
	sufficient to unambiguously identify the		sufficient to unambiguously identify the
	appropriate resources";		appropriate resources";
	leaf sequence {		leaf sequence {
	type uint32;		type uint32;
	description		description
	"Identify the sequence in the bundle.";		"Identify the sequence in the bundle.";
	}		}
	leaf component-link-ref {		leaf component-link-ref {
	type leafref {		type leafref {
	path "/if:interfaces/if:interface/if:name";		path "/if:interfaces/if:interface/if:name";
	require-instance "false";		require-instance false;
	}		}
	description		description
	"Reference to component link on this		"Reference to component link on this
	node.";		node.";
	}		}
	}		}
	}		}
	}		}
	}		}
	}		}
	list connectivity-matrix {		} // te-node-attributes
	key "id";
			grouping te-node-state-attributes {
			description "Node state attributes in a TE topology.";
			container te-node-state {
			description "Node state attributes in a TE topology.";
			uses information-source-attributes;
			}
			} // te-node-state-attributes
			grouping te-link-underlay-attributes {
			description "Attributes for te-link underlay.";
			container underlay-primary-path {
	description		description
	"Represents node's switching limitations, i.e. limitations		"The service path on the underlay topology that
	in interconnecting network TE links across the node.";		supports this link.";
	leaf id {		leaf provider-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology/tet:provider-id";
			require-instance false;
			}
			description
			"A reference to a provider-id.";
			}
			leaf client-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology/tet:client-id";
			require-instance false;
			}
			description
			"A reference to a client-id.";
			}
			leaf topology-id-ref {
			type leafref {
			path "/tet:te-topologies/tet:topology/tet:te-topology-id";
			require-instance false;
			}
			description
			"Identifies the topology where the path belongs.";
			}
			list path-element {
			key "path-element-id";
			description
			"A list of path elements describing the service path";
			leaf path-element-id {
			type uint32;
			description "To identify the element in a path.";
			}
			uses te-path-element;
			}
			} // underlay-primary-path
			list underlay-backup-path {
			key "index";
			description
			"A list of backup service paths on the underlay topology
			that
			protect the underlay primary path. If the primary path is
			not protected, the list contains zero elements. If the
			primary path is protected, the list contains one or more
			elements.";
			leaf index {
	type uint32;		type uint32;
	description "Identifies the connectivity-matrix entry.";		description
			"A sequence number to identify a backup path.";
	}		}
	container from-link {		leaf provider-id-ref {
	uses tet:link-end-ref;		type leafref {
			path "/tet:te-topologies/tet:topology/tet:provider-id";
			require-instance false;
			}
	description		description
	"Reference to source NTP.";		"A reference to a provider-id.";
	}		}
	container to-link {		leaf client-id-ref {
	uses tet:link-end-ref;		type leafref {
			path "/tet:te-topologies/tet:topology/tet:client-id";
			require-instance false;
			}
	description		description
	"Reference to destination NTP.";		"A reference to a client-id.";
	}		}
	leaf is-allowed {		leaf topology-id-ref {
	type boolean;		type leafref {
			path "/tet:te-topologies/tet:topology/tet:te-topology-id";
			require-instance false;
			}
	description		description
	"true - switching is allowed,		"Identifies the topology where the path belongs.";
	false - switching is disallowed.";		}
			list path-element {
			key "path-element-id";
			description
			"A list of path elements describing the backup service
			path";
			leaf path-element-id {
			type uint32;
			description "To identify the element in a path.";
			}
			uses te-path-element;
	}		}
			} // underlay-backup-path
			leaf underlay-protection-type {
			type uint16;
			description
			"Underlay protection type desired for this link";
	}		}
	container ted {		container underlay-trail-src {
	description "Includes TE node attributes.";		uses tet:link-end-ref;
	uses ted:ted-node-attributes;		description
			"Source TE link of the underlay trail.";
	}		}
	}		container underlay-trail-des {
	} // te-node-attributes		uses tet:link-end-ref;
			description
			"Destination TE link of the underlay trail.";
			}
			} // te-link-underlay-attributes
	grouping te-node-state-attributes {		grouping te-link-state-underlay-attributes {
	description "Node state attributes in a TE topology.";		description "State attributes for te-link underlay.";
	container te-node-state-attributes {		leaf dynamic {
	description "Node state attributes in a TE topology.";		type boolean;
	uses information-source-attributes;		description
	}		"true if the underlay is dynamically created.";
	} // te-node-state-attributes		}
			leaf committed {
			type boolean;
			description
			"true if the underlay is committed.";
			}
			} // te-link-state-underlay-attributes
	grouping te-link-underlay-attributes {		grouping performance-metric-attributes {
	description "Attributes for te-link underlay.";
	container underlay-path {
	description		description
	"The service path on the underlay topology that		"Link performance information in real time.";
	supports this link.";		reference
	leaf topology-id {		"draft-ietf-ospf-te-metric-extensions.";
	type leafref {		leaf unidirectional-delay {
	path "/tet:te-topologies/tet:topology/tet:te-topology-id";		type uint32 {
	require-instance false;		range 0..16777215;
	}		}
	description		description "Delay or latency in micro seconds.";
	"Identifies the topology where the path belongs.";
	}		}
	list path-element {		leaf unidirectional-min-delay {
	key "path-element-id";		type uint32 {
	description		range 0..16777215;
	"A list of path elements describing the service path";
	leaf path-element-id {
	type uint32;
	description "To identify the element in a path.";
	}		}
	uses te-path-element;		description "Minimum delay or latency in micro seconds.";
	}		}
	} // underlay-path		leaf unidirectional-max-delay {
	container underlay-backup-path {		type uint32 {
	description		range 0..16777215;
	"The backup service path on the underlay topology that		}
	supports this link.";		description "Maximum delay or latency in micro seconds.";
	leaf topology-id {		}
	type leafref {		leaf unidirectional-delay-variation {
	path "/tet:te-topologies/tet:topology/tet:te-topology-id";		type uint32 {
	require-instance false;		range 0..16777215;
			}
			description "Delay variation in micro seconds.";
			}
			leaf unidirectional-packet-loss {
			type decimal64 {
			fraction-digits 6;
			range "0 .. 50.331642";
	}		}
	description		description
	"Identifies the topology where the path belongs.";		"Packet loss as a percentage of the total traffic sent
			over a configurable interval. The finest precision is
			0.000003%.";
	}		}
	list path-element {		leaf unidirectional-residual-bandwidth {
	key "path-element-id";		type decimal64 {
			fraction-digits 2;
			}
	description		description
	"A list of path elements describing the backup service		"Residual bandwidth that subtracts tunnel
	path";		reservations from Maximum Bandwidth (or link capacity)
	leaf path-element-id {		[RFC3630] and provides an aggregated remainder across QoS
	type uint32;		classes.";
	description "To identify the element in a path.";		}
			leaf unidirectional-available-bandwidth {
			type decimal64 {
			fraction-digits 2;
	}		}
	uses te-path-element;		description
			"Available bandwidth that is defined to be residual
			bandwidth minus the measured bandwidth used for the
			actual forwarding of non-RSVP-TE LSP packets. For a
			bundled link, available bandwidth is defined to be the
			sum of the component link available bandwidths.";
	}		}
	} // underlay-backup-path		leaf unidirectional-utilized-bandwidth {
	leaf underlay-protection-type {		type decimal64 {
	type uint16;		fraction-digits 2;
	description		}
	"Underlay protection type desired for this link";		description
	}		"Bandwidth utilization that represents the actual
	container underlay-trail-src {		utilization of the link (i.e. as measured in the router).
	uses tet:link-end-ref;		For a bundled link, bandwidth utilization is defined to
	description		be the sum of the component link bandwidth
	"Source TE link of the underlay trail.";		utilizations.";
	}		}
	container underlay-trail-des {		} // performance-metric-attributes
	uses tet:link-end-ref;
	description
	"Destination TE link of the underlay trail.";
	}
	} // te-link-underlay-attributes
	grouping te-link-state-underlay-attributes {		grouping performance-metric-normality-attributes {
	description "State attributes for te-link underlay.";
	leaf dynamic {
	type boolean;
	description
	"true if the underlay is dynamically created.";
	}
	leaf committed {
	type boolean;
	description		description
	"true if the underlay is committed.";		"Link performance metric normality attributes.";
	}		reference
	} // te-link-state-underlay-attributes		"draft-ietf-ospf-te-metric-extensions.";
			leaf unidirectional-delay {
	grouping te-link-attributes {		type performance-metric-normality;
	description		description "Delay normality.";
	"Link attributes in a TE topology.";
	container te-link-attributes {
	description "Link attributes in a TE topology.";
	uses config-schedule-attributes;
	leaf name {
	type string;
	description "Link Name";
	}		}
	leaf-list flag {		leaf unidirectional-min-delay {
	type flag-type;		type performance-metric-normality;
	description "Link flags";		description "Minimum delay or latency normality.";
	}		}
	leaf is-abstract {		leaf unidirectional-max-delay {
	type boolean;		type performance-metric-normality;
	description "true if the link is abstract.";		description "Maximum delay or latency normality.";
	}		}
	container underlay {		leaf unidirectional-delay-variation {
	if-feature te-topology-hierarchy;		type performance-metric-normality;
	presence		description "Delay variation normality.";
	"Indicates the underlay exists for this link.";
	description "State of the underlay of this link.";
	uses te-link-underlay-attributes;
	} // underlay
	container ted {
	description "Includes TE link attributes.";
	uses ted:ted-link-attributes;
	}		}
	}		leaf unidirectional-packet-loss {
	} // te-link-attributes		type performance-metric-normality;
			description "Packet loss normality.";
	grouping te-link-state-attributes {		}
	description		leaf unidirectional-residual-bandwidth {
	"Link state attributes in a TE topology.";		type performance-metric-normality;
	container te-link-state-attributes {		description "Residual bandwidth normality.";
	description "Link state attributes in a TE topology.";		}
	uses information-source-attributes;		leaf unidirectional-available-bandwidth {
	}		type performance-metric-normality;
	} // te-link-state-attributes		description "Available bandwidth normality.";
			}
			leaf unidirectional-utilized-bandwidth {
			type performance-metric-normality;
			description "Bandwidth utilization normality.";
			}
			} // performance-metric-normality-attributes
	/*		grouping performance-metric-throttle-container {
	* Configuration data nodes		description
	*/		"A container controlling performance metric throttle.";
			container performance-metric-throttle {
			if-feature te-performance-metric;
			must "suppression-interval >= measure-interval" {
			error-message
			"suppression-interval cannot be less then
			measure-interval";
			description
			"Constraint on suppression-interval and
			measure-interval.";
			}
			description
			"Link performance information in real time.";
			reference
			"draft-ietf-ospf-te-metric-extensions.";
			leaf unidirectional-delay-offset {
			type uint32 {
			range 0..16777215;
			}
			description
			"Offset value to be added to the measured delay value.";
			}
			leaf measure-interval {
			type uint32;
			default 30;
			description
			"Interval in seconds to measure the extended metric
			values.";
			}
			leaf advertisement-interval {
			type uint32;
			description
			"Interval in seconds to advertise the extended metric
			values.";
			}
			leaf suppression-interval {
			type uint32 {
			range "1 .. max";
			}
			default 120;
			description
			"Interval in seconds to suppress advertising the extended
			metric values.";
			}
			container threshold-out {
			uses performance-metric-attributes;
			description
			"If the measured parameter falls outside an upper bound
			for all but the min delay metric (or lower bound for
			min-delay metric only) and the advertised value is not
			already outside that bound, anomalous announcement will be
			triggered.";
			}
			container threshold-in {
			uses performance-metric-attributes;
			description
			"If the measured parameter falls inside an upper bound
			for all but the min delay metric (or lower bound for
			min-delay metric only) and the advertised value is not
			already inside that bound, normal (anomalous-flag cleared)
			announcement will be triggered.";
			}
			container threshold-accelerated-advertisement {
			description
			"When the difference between the last advertised value and
			current measured value exceed this threshold, anomalous
			announcement will be triggered.";
			uses performance-metric-attributes;
			}
			}
			} // performance-metric-throttle-container
	container te-topologies {		grouping te-link-info-attributes {
	description
	"This container acts as the top-level data element of
	configuration data.";
	list topology {
	key "te-topology-id";
	description		description
	"This is the model of an abstract topology. A topology		"Advertised TE information attributes.";
	contains nodes and links. Each topology MUST be identified		leaf link-index {
	by a unique te-topology-id for reason that a network could		type uint64;
	contain many topologies.";
	leaf te-topology-id {
	type te-topology-id;
	description		description
	"It is presumed that a datastore will contain many		"The link identifier. If OSPF is used, this represents an
	topologies. To distinguish between topologies it is		ospfLsdbID. If IS-IS is used, this represents an isisLSPID.
	vital to have UNIQUE topology identifiers.";		If a locally configured link is used, this object represents
			a unique value, which is locally defined in a router.";
	}		}
	container topology-types {		leaf administrative-group {
			type te-types:admin-groups;
	description		description
	"This container is used to identify the type, or types (as		"Administrative group or color of the link.
	a topology can support several types simultaneously), of		This attribute covers both administrative group (defined in
	the topology.		RFC3630, RFC5329, and RFC5305), and extended administrative
	Topology types are the subject of several integrity		group (defined in RFC7308).";
	constraints that an implementing server can validate in
	order to maintain integrity of the datastore.
	Topology types are indicated through separate data nodes;
	the set of topology types is expected to increase over
	time.
	To add support for a new topology, an augmenting module
	needs to augment this container with a new empty optional
	container to indicate the new topology type.
	The use of a container allows to indicate a
	subcategorization of topology types.
	The container SHALL NOT be augmented with any data nodes
	that serve a purpose other than identifying a particular
	topology type.";
	uses te-topology-type; // Defines the TE topology type.
	}		}
	list node {		leaf max-link-bandwidth {
	key "te-node-id";		type decimal64 {
	leaf te-node-id {		fraction-digits 2;
	type te-node-id;
	description
	"The identifier of a node in the topology.
	A node is specific to a topology to which it belongs.";
	}		}
	description		description
	"The list of network nodes defined for the topology.";		"Maximum bandwidth that can be seen on this link in this
	leaf te-node-template {		direction. Units in bytes per second";
	type leafref {		}
	path "/te-topologies/node-template/name";		leaf max-resv-link-bandwidth {
			type decimal64 {
			fraction-digits 2;
			}
			description
			"Maximum amount of bandwidth that can be reserved in this
			direction in this link. Units in bytes per second";
			}
			list unreserved-bandwidth {
			key "priority";
			max-elements "8";
			description
			"Unreserved bandwidth for 0-7 priority levels. Units in
			bytes per second";
			leaf priority {
			type uint8 {
			range "0..7";
			}
			description "Priority";
			}
			leaf bandwidth {
			type decimal64 {
			fraction-digits 2;
	}		}
	description		description
	"The reference to a TE node template.";		"Unreserved bandwidth for this level";
	}		}
	uses te-node-attributes;
	}		}
	list link {		leaf te-default-metric {
	key "source-te-node-id source-te-link-id "		type uint32;
	+ "dest-te-node-id dest-te-link-id";		description
	leaf source-te-node-id {		"Traffic Engineering Metric";
	type leafref {		}
	path "../../node/te-node-id";		container performance-metric {
			if-feature te-performance-metric;
			description
			"Link performance information in real time.";
			reference
			"draft-ietf-ospf-te-metric-extensions.";
			container measurement {
			description
			"Measured performance metric values. Static configuration
			and manual overrides of these measurements are also
			allowed.";
			uses performance-metric-attributes;
			}
			container normality
			{
			description
			"Performance metric normality values.";
			uses performance-metric-normality-attributes;
			}
			}
			leaf link-protection-type {
			type enumeration {
			enum "unprotected" {
			description "unprotected";
			}
			enum "extra-traffic" {
			description "Extra traffic";
			}
			enum "shared" {
			description "Shared";
			}
			enum "1-for-1" {
			description "One for one protection";
			}
			enum "1-plus-1" {
			description "One plus one protection";
			}
			enum "enhanced" {
			description "Enhanced protection";
			}
			}
			description
			"Link Protection Type desired for this link";
			}
			list interface-switching-capabilities {
			key "switching-capability";
			description
			"List of interface capabilities for this interface";
			leaf switching-capability {
			type identityref {
			base te-types:switching-capabilities;
	}		}
	mandatory true;
	description		description
	"Source node identifier, must be in same topology.";		"Switching Capability for this interface";
	}		}
	leaf source-te-link-id {		leaf encoding {
	type leafref {		type identityref {
	path "../../node[te-node-id = "		base te-types:lsp-encoding-types;
	+ "current()/../source-te-node-id]/"
	+ "te-node-attributes/te-link/te-link-id";
	}		}
	mandatory true;
	description		description
	"Source TE link identifier, must be in same topology.";		"Encoding supported by this interface";
	}		}
	leaf dest-te-node-id {		list max-lsp-bandwidth {
	type leafref {		key "priority";
	path "../../node/te-node-id";		max-elements "8";
			description
			"Maximum LSP Bandwidth at priorities 0-7";
			leaf priority {
			type uint8 {
			range "0..7";
			}
			description "Priority";
			}
			leaf bandwidth {
			type decimal64 {
			fraction-digits 2;
			}
			description
			"Max LSP Bandwidth for this level";
			}
			}
			container packet-switch-capable {
			when "../switching-capability = 'PSC-1' or "
			+"../switching-capability = 'PSC-2' or "
			+"../switching-capability = 'PSC-3' or "
			+"../switching-capability = 'PSC-4'" {
			description "Valid only for PSC";
	}		}
	mandatory true;
	description		description
	"Destination node identifier, must be in the same		"Interface has packet-switching capabilities";
	topology.";		leaf minimum-lsp-bandwidth {
			type decimal64 {
			fraction-digits 2;
			}
			description
			"Minimum LSP Bandwidth. Units in bytes per second";
			}
			leaf interface-mtu {
			type uint16;
			description
			"Interface MTU";
			}
	}		}
	leaf dest-te-link-id {		container time-division-multiplex-capable {
	type leafref {		when "../switching-capability = 'TDM'" {
	path "../../node[te-node-id = "		description "Valid only for TDM";
	+ "current()/../dest-te-node-id]/"
	+ "te-node-attributes/te-link/te-link-id";
	}		}
	mandatory true;
	description		description
	"Destination TE link identifier, must be in same		"Interface has time-division multiplex capabilities";
	topology.";
			leaf minimum-lsp-bandwidth {
			type decimal64 {
			fraction-digits 2;
			}
			description
			"Minimum LSP Bandwidth. Units in bytes per second";
			}
			leaf indication {
			type enumeration {
			enum "standard" {
			description "Indicates support of standard SONET/SDH";
			}
			enum "arbitrary" {
			description "Indicates support of arbitrary
			SONET/SDH";
			}
			}
			description
			"Indication whether the interface supports Standard or
			Arbitrary SONET/SDH";
			}
	}		}
			}
			container te-srlgs {
	description		description
	"TE link is a logical construct that represents a way		"A list of SLRGs.";
	to group/map information about certain physical		leaf-list values {
	resources (and their properties) that interconnect TE		type te-types:srlg;
	nodes.		description "SRLG value";
	A Network Link connects a by Local (Source) node and		}
	a Remote (Destination) Network Nodes via a set of the		}
	nodes' TE links.		} // te-link-info-attributes
	As it is possible to have several links between the
	same source and destination nodes, and as a link		grouping te-link-attributes {
	could potentially be re-homed, to ensure that we		description
	would always know to distinguish between		"Link attributes in a TE topology.";
	links, every link is identified by a dedicated link		container te-link-attributes {
	identifier.		description "Link attributes in a TE topology.";
	Note that a link models a point-to-point link, not a		uses config-schedule-attributes;
	multipoint link.";		leaf name {
	leaf te-link-template {		type string;
	type leafref {		description "Link Name";
	path "/te-topologies/link-template/name";		}
			leaf-list flag {
			type flag-type;
			description "Link flags";
			}
			leaf is-abstract {
			type boolean;
			description "true if the link is abstract.";
			}
			container underlay {
			if-feature te-topology-hierarchy;
			presence
			"Indicates the underlay exists for this link.";
			description "State of the underlay of this link.";
			uses te-link-underlay-attributes;
			} // underlay
			leaf admin-status {
			type enumeration {
			enum up {
			value 1;
			description
			"Enabled.";
			}
			enum down {
			value 2;
			description
			"Disabled.";
			}
			enum testing {
			value 3;
			description
			"In some test mode.";
			}
	}		}
	description		description
	"The reference to a TE link template.";		"The desired state of the link.";
	}		}
	uses te-link-attributes;
	} // link
	} // topology
	list node-template {		uses performance-metric-throttle-container;
	key "name";		uses te-link-info-attributes;
	leaf name {
	type te-template-name;
	description
	"The name to identify a TE node template.";
	}		}
	description		} // te-link-attributes
	"The list of TE node templates used to define sharable
	and reusable TE node attributes.";
	uses te-node-attributes;
	} // node
	list link-template {		grouping te-link-state-attributes {
	key "name";
	leaf name {
	type te-template-name;
	description
	"The name to identify a TE link template.";
	}
	description		description
	"The list of TE link templates used to define sharable		"Link state attributes in a TE topology.";
	and reusable TE link attributes.";		container te-link-state {
	uses te-link-attributes;		description "Link state attributes in a TE topology.";
	} // link		leaf oper-status {
	} // te-topologies		type enumeration {
			enum up {
	/*		value 1;
	* Operational state data nodes		description
	*/		"Operational up";
			}
			enum down {
			value 2;
			description
			"Operational down.";
			}
			enum testing {
			value 3;
			description
			"In some test mode";
			}
			enum unknown {
			value 4;
			description
			"Status cannot be determined for some reason.";
			}
			}
			description
			"The current operational state of the link.";
			}
			uses information-source-attributes;
			list alt-information-sources {
			key "information-source";
			description
			"A list of information sources learned but not used.";
			uses information-source-attributes;
			uses te-link-info-attributes;
			}
			}
			} // te-link-state-attributes
	container te-topologies-state {		grouping template-attributes {
	config "false";
	description
	"This container acts as the top-level state data element of
	operational data.";
	list topology {
	key "te-topology-id";
	description		description
	"This is the model of an abstract topology. A topology		"Common attributes for all templates.";
	contains nodes and links. Each topology MUST be identified
	by a unique te-topology-id for reason that a network could		leaf priority {
	contain many topologies.";		type uint16;
	leaf te-topology-id {
	type te-topology-id;
	description		description
	"It is presumed that a datastore will contain many		"The preference value to resolve conflicts between different
	topologies. To distinguish between topologies it is		templates. When two or more templates specify values for
	vital to have UNIQUE topology identifiers.";		one configuration attribute, the value from the template
			with the highest priority is used.";
	}		}
	leaf server-provided {		leaf reference-change-policy {
	type boolean;		type enumeration {
	config false;		enum no-action {
			description
			"When an attribute changes in this template, the
			configuration node referring to this template does
			not take any action.";
			}
			enum not-allowed {
			description
			"When any configuration object has a reference to this
			template, changing this template is not allowed.";
			}
			enum cascade {
			description
			"When an attribute changes in this template, the
			configuration object referring to this template applies
			the new attribute value to the corresponding
			configuration.";
			}
			}
	description		description
	"Indicates whether the topology is configurable by		"This attribute specifies the action taken to a
	clients, or whether it is provided by the server. This		configuration
	leaf is populated by the server implementing the model.		node that has a reference to this template.";
	It is set to false for topologies that are created by a
	client; it is set to true otherwise. If it is set to
	true, any attempt to edit the topology MUST be rejected.";
	}		}
	container topology-types {		} // template-attributes
			/*
			* Configuration data nodes
			*/
			container te-topologies {
			description
			"This container acts as the top-level data element of
			configuration data.";
			list topology {
			key "provider-id client-id te-topology-id";
	description		description
	"This container is used to identify the type, or types (as		"This is the model of an abstract topology. A topology
	a topology can support several types simultaneously), of		contains nodes and links. Each topology MUST be identified
	the topology.		by a unique te-topology-id for reason that a network could
	Topology types are the subject of several integrity		contain many topologies.";
	constraints that an implementing server can validate in		leaf provider-id {
	order to maintain integrity of the datastore.		type te-global-id;
	Topology types are indicated through separate data nodes;
	the set of topology types is expected to increase over
	time.
	To add support for a new topology, an augmenting module
	needs to augment this container with a new empty optional
	container to indicate the new topology type.
	The use of a container allows to indicate a
	subcategorization of topology types.
	The container SHALL NOT be augmented with any data nodes
	that serve a purpose other than identifying a particular
	topology type.";
	uses te-topology-type; // Defines the TE topology type.
	}
	list node {
	key "te-node-id";
	leaf te-node-id {
	type te-node-id;
	description		description
	"The identifier of a node in the topology.		"An identifier to uniquely identify a provider.";
	A node is specific to a topology to which it belongs.";
	}		}
	description		leaf client-id {
	"The list of network nodes defined for the topology.";		type te-global-id;
	leaf te-node-template {
	type leafref {
	path "/te-topologies/node-template/name";
	}
	description		description
	"The reference to a TE node template.";		"An identifier to uniquely identify a client.";
	}		}
	uses te-node-attributes;		leaf te-topology-id {
	uses te-node-state-attributes;		type te-topology-id;
	}
	list link {
	key "source-te-node-id source-te-link-id "
	+ "dest-te-node-id dest-te-link-id";
	leaf source-te-node-id {
	type leafref {
	path "../../node/te-node-id";
	}
	mandatory true;
	description		description<