]> A YANG Data Model for Flexi-Grid Optical Networks Naudit HPCN
jorge.lopez_vergara@uam.es
Universidad Autonoma de Madrid
daniel.perdices@uam.es
Old Dog Consulting
daniel@olddog.co.uk
Samsung
younglee.tx@gmail.com
Huawei Technologies
zhenghaomian@huawei.com
Routing CCAMP Working Group next generation unicorn sparkling distributed ledger This document defines a YANG module for managing flexi-grid optical networks. The model defined in this document specifies a flexi-grid traffic engineering database that is used to describe the topology of a flexi-grid network. It is based on and augments existing YANG models that describe network and traffic engineering topologies. About This Document The latest revision of this draft can be found at . Status information for this document may be found at . Discussion of this document takes place on the Common Control and Measurement Plane Working Group mailing list (), which is archived at . Subscribe at . Source for this draft and an issue tracker can be found at .
Introduction The flexible grid (flexi-grid) optical network technology defined by the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) and documented in Recommendation ITU- T_G.694.1 and ITU-T_G.872 provides an enhanced Dense Wavelength Division Multiplexing (DWDM) grid by defining a set of nominal central frequencies, slot widths, and the concept of the "frequency slot". This technology increases both transport network scalability and flexibility, allowing the optimization of bandwidth usage. provides a framework for GMPLS-Based control of flexi-grid DWDM networks while defines generalized labels for the use of GMPLS in flexi-grid networks. provides extensions to the OSPF-TE protocol so as to support GMPLS control of flexi-grid networks. This document presents a YANG data model for flexi-grid objects in the dynamic optical network, including nodes, transponders and links, as well as how such links interconnect nodes. This model is independent of control plane protocols. This document identifies the flexi-grid components, parameters, and their values. It characterizes the features and the performances of the flexi-grid elements. For this, it augments , and imports the generic Layer 0 types and use of "media-channel" defined in . An application example in is also provided to better understand the utility of this YANG model. A partner document defines a second YANG module that described flexi- grid tunnels, i.e., the paths from source to destination through a number of intermediate nodes . Impairment-aware traffic engineering topology is described in . The YANG data model defined in this document conforms to the Network Management Datastore Architecture (NMDA) .
Terminology Refer to and for the key terms used in this document. The following terms are defined in and are not redefined here:
  • client
  • server
  • augment
  • data model
  • data node
The following terms are defined in and are not redefined here:
  • configuration data
  • state data
The terminology for describing YANG data models is found in .
Tree Diagram A simplified graphical representation of the data model is used in this document. The meaning of the symbols in these diagrams is defined in .
Prefixes in Data Node Names In this document, names of data nodes and other data model objects are prefixed using the standard prefix associated with the corresponding YANG imported modules, as shown in . It uses prefixes from , , and . Prefixes and corresponding YANG modules
Prefix YANG module Reference
l0-types ietf-layer0-types [RFCYYYY]
flexgt ietf-flexi-grid-topology RFC XXXX
nw ietf-network
nt ietf-network-topology
tet ietf-te-topology
RFC Editor Note: Please replace XXXX with the RFC number assigned to this document. Please replace YYYY with the RFC numbers assigned to . Please remove this note.
Example of Use In order to explain how this model is used, we provide the following example. An optical network usually has multiple transponders, switches (nodes) and links. shows a simple topology.
Topology Example | grid |<------>| grid |<------>| | |......... | |node B| |node C| | .........| | Trans- : | +------+ +------+ | : Trans- | | ponder : | | : ponder | | A : | +----------+ | : E | |........: | Link 4 |Flexi-grid| Link 5 | :........| | |<------------>| node |<------------>| | | | | D | | | | | +----------+ | | +----------+ +----------+ ]]>
In order to configure a flexi-grid network to interconnect transponders A and E, first of all we have to populate the flexi-grid topology YANG model with all elements in the network:
  • We define the transponders within nodes A and E as tunnel termination points (TTPs) and provide their internal local link connectivity towards the node interfaces. We also provide the identifiers, addresses and interfaces of nodes A and B.
  • We do the same for the nodes B, C and D, providing their identifiers, addresses and interfaces, as well as the internal connectivity matrix between interfaces.
  • Then, we also define the links 1 to 5 that interconnect nodes, indicating which flexi-grid labels are available.
  • Other information, such as the slot frequency and granularity are also provided.
YANG Data Model for Flexi-Grid Topology
Flexi-Grid Topology Data Model Overview This document describes the data model for flexi-grid topology. As a classic traffic engineering (TE) technology, flexi-grid provides WDM switching in transport network. Therefore the YANG module presented in this document augments from a more generic TE network topology data model, i.e., the ietf-te-topology, as specified in , following the guidelines provided in section 6 of . Common types, identities, and groupings defined in are reused in this document. The figure below shows the augmentation relationship between YANG models.
Relationship between Flexi-Grid and TE topology models
The entities and TE attributes, such as node, termination points and links, are still applicable for describing a flexi-grid topology and the model presented in this document only specifies the technology- specific attributes/information. The flexi-grid specific attributes and label format is defined in , including the grid type, nominal central frequency granularity, slot width granularity, n and m parameters. A collection of common data types have also been specified in , and used in this document for augmentation of the generic TE topology model. The YANG module ietf-flexi-grid-topology defined in this document conforms to the Network Management Datastore Architecture (NMDA) defined in .
Augmentations for Flexi-Grid Topology and Node There are a few characteristics augmenting to the generic TE topology. Following the guidelines in , a flexi-grid-topology network- type is specified as the indicator of flexi-grid in the topology as shown in .
Flexi-Grid Topology Augmentation
A flexi-grid-node presence container is specified, augmenting the generic TE node attributes, to indicate that the TE node is a Flexi- Grid node as shown in .
Flex-Grid Node Augmentation
It is assumed that all the flexi-grid nodes are reconfigurable.
Bandwidth Augmentation No bandwidth augmentations are needed for this YANG module. As described in Section 4.2 of , there is some overlap between bandwidth and label in Layer 0. The flexi-grid label resource information described in , is sufficient to also describe the spectrum resources within a flexi- grid network. Therefore, the model does not define any augmentation for the te-bandwidth containers defined in .
Label Augmentation The model augments all the occurrences of the label-restriction list in with flexi-grid technology specific attributes using the flexi-grid-label-range-info grouping defined in . Moreover, following the guidelines in , the model augments all the occurrences of the te-label container with the flexi-grid technology specific attributes using the flexi-grid-label-start-end, flexi-grid-label-hop and flexi-grid-label-step groupings defined in .
YANG Model (Tree Structure) for Flexi-Grid Topology
The YANG Code for Flexi-grid topology
WG List: Editor: Jorge E. Lopez de Vergara Editor: Daniel Perdices Editor: Haomian Zheng Editor: Daniel King Editor: Young Lee "; description "This YANG module defines a topology model for flexi-grid optical networks. The model augments the technology-agnostic TE topology model with flexi-grid technology specific definitions, based on RFC 7698 and RFC 7699. The model fully conforms to the Network Management Datastore Architecture (NMDA). Copyright (c) 2023 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC XXXX; see the RFC itself for full legal notices. The key words 'MUST', 'MUST NOT', 'REQUIRED', 'SHALL', 'SHALL NOT', 'SHOULD', 'SHOULD NOT', 'RECOMMENDED', 'NOT RECOMMENDED', 'MAY', and 'OPTIONAL' in this document are to be interpreted as described in BCP 14 (RFC 2119) (RFC 8174) when, and only when, they appear in all capitals, as shown here."; reference "RFC 7698: Framework and Requirements for GMPLS-Based Control of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks; RFC 7699: Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers."; revision 2023-12-15 { description "Initial Version"; reference "RFC XXXX: A YANG Data Model for Flexi-Grid Optical Networks"; // RFC Ed.: replace XXXX with actual RFC number, update date // information and remove this note } /* * Groupings */ grouping label-range-info { description "Flexi-grid-specific label range related information with a presence container indicating whether the label range is a flexi-grid label range."; container flexi-grid-label-range { presence "Indicates the label range is a flexi-grid label range. This container MUST NOT be present if there are other presence containers or attributes indicating another type of label range."; description "Flexi-grid-specific label range related information."; uses l0-types:flexi-grid-label-range-info; } } /* * Data nodes */ augment "/nw:networks/nw:network/nw:network-types" + "/tet:te-topology" { description "Augment network types to define flexi-grid topology type."; container flexi-grid-topology { presence "Its presence identifies the flexi-grid topology type."; description "Introduce new network type for flexi-grid topology."; } } augment "/nw:networks/nw:network/nw:node/tet:te" + "/tet:te-node-attributes" { when "/nw:networks/nw:network/nw:network-types" + "/tet:te-topology/flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE node attributes."; container flexi-grid-node { presence "The TE node is a flexi-grid node."; description "Introduce new TE node type for flexi-grid node."; } } /* * Augment TE label range information */ augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:label-restrictions/tet:label-restriction" { when "../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the TE node connectivity matrices."; uses label-range-info; } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:from/" + "tet:label-restrictions/tet:label-restriction" { when "../../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the source Link Termination Point (LTP) of the connectivity matrix entry."; uses label-range-info; } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:to/" + "tet:label-restrictions/tet:label-restriction" { when "../../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the destination LTP of the connectivity matrix entry."; uses label-range-info; } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/" + "tet:connectivity-matrices/tet:label-restrictions/" + "tet:label-restriction" { when "../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the TE node connectivity matrices information source."; uses label-range-info; } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:from/tet:label-restrictions/tet:label-restriction" { when "../../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the source LTP of the connectivity matrix entry information source."; uses label-range-info; } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:to/tet:label-restrictions/tet:label-restriction" { when "../../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the destination LTP of the connectivity matrix entry information source."; uses label-range-info; } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:label-restrictions/tet:label-restriction" { when "../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the Tunnel Termination Point (TTP) Local Link Connectivities."; uses label-range-info; } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/" + "tet:label-restrictions/tet:label-restriction" { when "../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the TTP Local Link Connectivity entry."; uses label-range-info; } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:label-restrictions/tet:label-restriction" { when "../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the TE link."; uses label-range-info; } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:information-source-entry/" + "tet:label-restrictions/tet:label-restriction" { when "../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range information for the TE link information source."; uses label-range-info; } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:label-restrictions/tet:label-restriction" { description "Augment TE label range information for the TE link template."; uses label-range-info; } /* * Augment TE label */ augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-start/" + "tet:te-label/tet:technology" { when "../../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the TE node connectivity matrices."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:label-restrictions/" + "tet:label-restriction/tet:label-end/" + "tet:te-label/tet:technology" { when "../../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the TE node connectivity matrices."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:label-restrictions/" + "tet:label-restriction/tet:label-step/" + "tet:technology" { when "../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the TE node connectivity matrices."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:underlay/tet:primary-path/tet:path-element/" + "tet:type/tet:label/tet:label-hop/" + "tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay primary path of the TE node connectivity matrices."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:underlay/tet:backup-path/tet:path-element/" + "tet:type/tet:label/tet:label-hop/" + "tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay backup path of the TE node connectivity matrices."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-exclude-objects/" + "tet:route-object-exclude-object/" + "tet:type/tet:label/tet:label-hop/" + "tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects excluded by the path computation of the TE node connectivity matrices."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-include-objects/" + "tet:route-object-include-object/" + "tet:type/tet:label/tet:label-hop/" + "tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects included by the path computation of the TE node connectivity matrices."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:path-properties/tet:path-route-objects/" + "tet:path-route-object/tet:type/tet:label/tet:label-hop/" + "tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the computed path route objects of the TE node connectivity matrices."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:from/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-start/" + "tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the source LTP of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:from/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-end/" + "tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the source LTP of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:from/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-step/" + "tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the source LTP of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:to/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-start/" + "tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the destination LTP of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:to/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-end/" + "tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the destination LTP of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:to/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-step/" + "tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the destination LTP of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:underlay/tet:primary-path/tet:path-element/" + "tet:type/tet:label/tet:label-hop/" + "tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay primary path of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:underlay/tet:backup-path/tet:path-element/" + "tet:type/tet:label/tet:label-hop/" + "tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay backup path of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:optimizations/" + "tet:algorithm/tet:metric/tet:optimization-metric/" + "tet:explicit-route-exclude-objects/" + "tet:route-object-exclude-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects excluded by the path computation of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/tet:optimizations/" + "tet:algorithm/tet:metric/tet:optimization-metric/" + "tet:explicit-route-include-objects/" + "tet:route-object-include-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects included by the path computation of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:path-properties/tet:path-route-objects/" + "tet:path-route-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the computed path route objects of the connectivity matrix entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/" + "tet:connectivity-matrices/tet:label-restrictions/" + "tet:label-restriction/" + "tet:label-start/tet:te-label/tet:technology" { when "../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the TE node connectivity matrices information source."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/" + "tet:connectivity-matrices/tet:label-restrictions/" + "tet:label-restriction/" + "tet:label-end/tet:te-label/tet:technology" { when "../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the TE node connectivity matrices information source."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/" + "tet:connectivity-matrices/tet:label-restrictions/" + "tet:label-restriction/" + "tet:label-step/tet:technology" { when "../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the TE node connectivity matrices information source."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:underlay/tet:primary-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay primary path of the TE node connectivity matrices of the information source entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:underlay/tet:backup-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay backup path of the TE node connectivity matrices of the information source entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-exclude-objects/" + "tet:route-object-exclude-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects excluded by the path computation of the TE node connectivity matrices information source."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-include-objects/" + "tet:route-object-include-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects included by the path computation of the TE node connectivity matrices information source."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:path-properties/tet:path-route-objects/" + "tet:path-route-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the computed path route objects of the TE node connectivity matrices information source."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:from/tet:label-restrictions/" + "tet:label-restriction/" + "tet:label-start/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the source LTP of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:from/tet:label-restrictions/" + "tet:label-restriction/" + "tet:label-end/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the source LTP of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:from/tet:label-restrictions/" + "tet:label-restriction/" + "tet:label-step/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the source LTP of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:to/tet:label-restrictions/tet:label-restriction/" + "tet:label-start/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the destination LTP of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:to/tet:label-restrictions/tet:label-restriction/" + "tet:label-end/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the destination LTP of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:to/tet:label-restrictions/tet:label-restriction/" + "tet:label-step/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the destination LTP of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:underlay/tet:primary-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay primary path of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:underlay/tet:backup-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay backup path of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-exclude-objects/" + "tet:route-object-exclude-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects excluded by the path computation of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-include-objects/" + "tet:route-object-include-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects included by the path computation of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry/tet:connectivity-matrices/" + "tet:connectivity-matrix/" + "tet:path-properties/tet:path-route-objects/" + "tet:path-route-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the computed path route objects of the connectivity matrix entry information source."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-start/" + "tet:te-label/tet:technology" { when "../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the TTP Local Link Connectivities."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-end/" + "tet:te-label/tet:technology"{ when "../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the TTP Local Link Connectivities."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-step/" + "tet:technology"{ when "../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the TTP Local Link Connectivities."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:underlay/tet:primary-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay primary path of the TTP Local Link Connectivities."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:underlay/tet:backup-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay backup path of the TTP Local Link Connectivities."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-exclude-objects/" + "tet:route-object-exclude-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects excluded by the path computation of the TTP Local Link Connectivities."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-include-objects/" + "tet:route-object-include-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects included by the path computation of the TTP Local Link Connectivities."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:path-properties/tet:path-route-objects/" + "tet:path-route-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the computed path route objects of the TTP Local Link Connectivities."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-start/tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the TTP Local Link Connectivity entry."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-end/tet:te-label/tet:technology" { when "../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the TTP Local Link Connectivity entry."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-step/tet:technology" { when "../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the TTP Local Link Connectivity entry."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/" + "tet:underlay/tet:primary-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay primary path of the TTP Local Link Connectivity entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/" + "tet:underlay/tet:backup-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay backup path of the TTP Local Link Connectivity entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-exclude-objects/" + "tet:route-object-exclude-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects excluded by the path computation of the TTP Local Link Connectivity entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/" + "tet:optimizations/tet:algorithm/tet:metric/" + "tet:optimization-metric/" + "tet:explicit-route-include-objects/" + "tet:route-object-include-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the explicit route objects included by the path computation of the TTP Local Link Connectivity entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point/" + "tet:local-link-connectivities/" + "tet:local-link-connectivity/" + "tet:path-properties/tet:path-route-objects/" + "tet:path-route-object/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the computed path route objects of the TTP Local Link Connectivity entry."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:underlay/tet:primary-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay primary path of the TE link."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:underlay/tet:backup-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { when "../../../../../../../../" + "nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label hop for the underlay backup path of the TE link."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-start/tet:te-label/tet:technology" { when "../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the TE link."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-end/tet:te-label/tet:technology" { when "../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the TE link."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:te-link-attributes/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-step/tet:technology" { when "../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the TE link."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:information-source-entry/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-start/tet:te-label/tet:technology" { when "../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range start for the TE link information source."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:information-source-entry/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-end/tet:te-label/tet:technology" { when "../../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range end for the TE link information source."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/nw:network/nt:link/tet:te/" + "tet:information-source-entry/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-step/tet:technology" { when "../../../../../../nw:network-types/tet:te-topology/" + "flexgt:flexi-grid-topology" { description "Augmentation parameters apply only for networks with flexi-grid topology type."; } description "Augment TE label range step for the TE link information source."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:underlay/tet:primary-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { description "Augment TE label hop for the underlay primary path of the TE link template."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:underlay/tet:backup-path/tet:path-element/tet:type/" + "tet:label/tet:label-hop/tet:te-label/tet:technology" { description "Augment TE label hop for the underlay backup path of the TE link template."; case flexi-grid { uses l0-types:flexi-grid-label-hop; } } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-start/tet:te-label/tet:technology" { description "Augment TE label range start for the TE link template."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-end/tet:te-label/tet:technology" { description "Augment TE label range end for the TE link template."; case flexi-grid { uses l0-types:flexi-grid-label-start-end; } } augment "/nw:networks/tet:te/tet:templates/" + "tet:link-template/tet:te-link-attributes/" + "tet:label-restrictions/tet:label-restriction/" + "tet:label-step/tet:technology" { description "Augment TE label range step for the TE link template."; case flexi-grid { uses l0-types:flexi-grid-label-step; } } } ]]>
Security Considerations The YANG module specified in this document defines a schema for data that is designed to be accessed via network management protocols such as NETCONF or RESTCONF . The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) . The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is Transport Layer Security (TLS) . The NETCONF access control model provides the means to restrict access for particular NETCONF users to a preconfigured subset of all available NETCONF protocol operations and content. The NETCONF Protocol SSH describes a method for invoking and running NETCONF within a SSH session as an SSH subsystem. The Network Configuration Access Control Model (NACM) provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. A number of configuration data nodes defined in this document are writable/deletable (i.e., "config true"). These data nodes may be considered sensitive or vulnerable in some network environments. There are a number of data nodes defined in this YANG module that are writable/creatable/deletable (i.e., config true, which is the default). These data nodes may be considered sensitive or vulnerable in some network environments. Write operations (e.g., edit-config) to these data nodes without proper protection can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/vulnerability:
IANA Considerations IANA is requested to assigned a new URI from the "IETF XML Registry" as follows: IANA is requested to assign a new YANG module name in the "YANG Module Names" registry as follows:
References Normative References Spectral grids for WDM applications: DWDM frequency grid ITU-T Recommendation G.694.1 Architecture of optical transport networks International Telecommunication Union Generalized Labels for the Flexi-Grid in Lambda Switch Capable (LSC) Label Switching Routers GMPLS supports the description of optical switching by identifying entries in fixed lists of switchable wavelengths (called grids) through the encoding of lambda labels. Work within the ITU-T Study Group 15 has defined a finer-granularity grid, and the facility to flexibly select different widths of spectrum from the grid. This document defines a new GMPLS lambda label format to support this flexi-grid. This document updates RFCs 3471 and 6205 by introducing a new label format. GMPLS OSPF-TE Extensions in Support of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks The International Telecommunication Union Telecommunication standardization sector (ITU-T) has extended its Recommendations G.694.1 and G.872 to include a new Dense Wavelength Division Multiplexing (DWDM) grid by defining channel spacings, a set of nominal central frequencies, and the concept of the "frequency slot". Corresponding techniques for data-plane connections are known as "flexi-grid". Based on the characteristics of flexi-grid defined in G.694.1 and in RFCs 7698 and 7699, this document describes the Open Shortest Path First - Traffic Engineering (OSPF-TE) extensions in support of GMPLS control of networks that include devices that use the new flexible optical grid. The YANG 1.1 Data Modeling Language YANG is a data modeling language used to model configuration data, state data, Remote Procedure Calls, and notifications for network management protocols. This document describes the syntax and semantics of version 1.1 of the YANG language. YANG version 1.1 is a maintenance release of the YANG language, addressing ambiguities and defects in the original specification. There are a small number of backward incompatibilities from YANG version 1. This document also specifies the YANG mappings to the Network Configuration Protocol (NETCONF). YANG Data Model for Traffic Engineering (TE) Topologies This document defines a YANG data model for representing, retrieving, and manipulating Traffic Engineering (TE) Topologies. The model serves as a base model that other technology-specific TE topology models can augment. Common YANG Data Types for Layer 0 Optical Networks Nokia Huawei Nokia Orange Futurewei Technologies This document defines a collection of common data types, identities, and groupings in the YANG data modeling language. These common types and groupings, derived from the built-in YANG data types, identities, and groupings are intended to be imported by modules that model Optical Layer 0 configuration and state capabilities, such as Wavelength Switched Optical Networks (WSONs) and flexi-grid Dense Wavelength Division Multiplexing (DWDM) networks. This document obsoletes RFC 9093 by replacing the YANG module it contained with a new revision that includes additional YANG data types, identities and groupings. Network Management Datastore Architecture (NMDA) Datastores are a fundamental concept binding the data models written in the YANG data modeling language to network management protocols such as the Network Configuration Protocol (NETCONF) and RESTCONF. This document defines an architectural framework for datastores based on the experience gained with the initial simpler model, addressing requirements that were not well supported in the initial model. This document updates RFC 7950. Network Configuration Protocol (NETCONF) The Network Configuration Protocol (NETCONF) defined in this document provides mechanisms to install, manipulate, and delete the configuration of network devices. It uses an Extensible Markup Language (XML)-based data encoding for the configuration data as well as the protocol messages. The NETCONF protocol operations are realized as remote procedure calls (RPCs). This document obsoletes RFC 4741. [STANDARDS-TRACK] A YANG Data Model for Network Topologies This document defines an abstract (generic, or base) YANG data model for network/service topologies and inventories. The data model serves as a base model that is augmented with technology-specific details in other, more specific topology and inventory data models. RESTCONF Protocol This document describes an HTTP-based protocol that provides a programmatic interface for accessing data defined in YANG, using the datastore concepts defined in the Network Configuration Protocol (NETCONF). Using the NETCONF Protocol over Secure Shell (SSH) This document describes a method for invoking and running the Network Configuration Protocol (NETCONF) within a Secure Shell (SSH) session as an SSH subsystem. This document obsoletes RFC 4742. [STANDARDS-TRACK] The Transport Layer Security (TLS) Protocol Version 1.3 This document specifies version 1.3 of the Transport Layer Security (TLS) protocol. TLS allows client/server applications to communicate over the Internet in a way that is designed to prevent eavesdropping, tampering, and message forgery. This document updates RFCs 5705 and 6066, and obsoletes RFCs 5077, 5246, and 6961. This document also specifies new requirements for TLS 1.2 implementations. Network Configuration Access Control Model The standardization of network configuration interfaces for use with the Network Configuration Protocol (NETCONF) or the RESTCONF protocol requires a structured and secure operating environment that promotes human usability and multi-vendor interoperability. There is a need for standard mechanisms to restrict NETCONF or RESTCONF protocol access for particular users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. This document defines such an access control model. This document obsoletes RFC 6536. The IETF XML Registry This document describes an IANA maintained registry for IETF standards which use Extensible Markup Language (XML) related items such as Namespaces, Document Type Declarations (DTDs), Schemas, and Resource Description Framework (RDF) Schemas. YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF) YANG is a data modeling language used to model configuration and state data manipulated by the Network Configuration Protocol (NETCONF), NETCONF remote procedure calls, and NETCONF notifications. [STANDARDS-TRACK] Informative References Framework and Requirements for GMPLS-Based Control of Flexi-Grid Dense Wavelength Division Multiplexing (DWDM) Networks To allow efficient allocation of optical spectral bandwidth for systems that have high bit-rates, the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) has extended its Recommendations G.694.1 and G.872 to include a new Dense Wavelength Division Multiplexing (DWDM) grid by defining a set of nominal central frequencies, channel spacings, and the concept of the "frequency slot". In such an environment, a data-plane connection is switched based on allocated, variable-sized frequency ranges within the optical spectrum, creating what is known as a flexible grid (flexi-grid). Given the specific characteristics of flexi-grid optical networks and their associated technology, this document defines a framework and the associated control-plane requirements for the application of the existing GMPLS architecture and control-plane protocols to the control of flexi-grid DWDM networks. The actual extensions to the GMPLS protocols will be defined in companion documents. A YANG Data Model for Flexi-Grid Tunnels Naudit HPCN Universidad Autonoma de Madrid Old Dog Consulting Nokia Huawei Technologies Nokia Cisco This document defines a YANG model for managing flexi-grid optical tunnels (media-channels), complementing the information provided by the flexi-grid topology model. The YANG data model defined in this document conforms to the Network Management Datastore Architecture (NMDA). A YANG Data Model for Optical Impairment-aware Topology Nokia Orange Nokia Nokia Huawei Technologies In order to provision an optical connection through optical networks, a combination of path continuity, resource availability, and impairment constraints must be met to determine viable and optimal paths through the network. The determination of appropriate paths is known as Impairment-Aware Routing and Wavelength Assignment (IA-RWA) for a Wavelength Switched Optical Network (WSON), while it is known as Impairment-Aware Routing and Spectrum Assignment (IA-RSA) for a Spectrum Switched Optical Network (SSON). This document provides a YANG data model for the impairment-aware TE topology in optical networks. YANG Tree Diagrams This document captures the current syntax used in YANG module tree diagrams. The purpose of this document is to provide a single location for this definition. This syntax may be updated from time to time based on the evolution of the YANG language.
Acknowledgments The work presented in this document has been partially funded by the European Commission under the project H2020 METRO-HAUL (Metro High bandwidth, 5G Application-aware optical network, with edge storage, compUte and low Latency), Grant Agreement number: 761727. This work is also partially funded by the Spanish State Research Agency under the project AgileMon (AEI PID2019-104451RB-C21) and by the Spanish Ministry of Science, Innovation and Universities under the program for the training of university lecturers (Grant number: FPU19/05678). Thanks to Adrian Farrel for reviewing this document and assisting with conversion to XML.
Contributors Telefonica
oscar.gonzalezdedios@telefonica.com
ggalimbe56@gmail.com
Nokia
sergio.belotti@nokia.com
Cisco
zali@cisco.com
Universidad Autonoma de Madrid
daniel.michaud@estudiante.uam.es
MTN Group Technology
Steven.Hill@mtn.com
Nokia
victor.lopez@nokia.com
Huawei Technologies
italo.busi@huawei.com
Futurewei
aihuaguo.ietf@gmail.com