Network Working Group I. Bryskin Internet-Draft Huawei Technologies Intended status: Informational X. Liu Expires: September 2, 2018 Jabil March 1, 2018 SF Aware TE Topology YANG Model draft-bryskin-teas-sf-aware-topo-model-01 Abstract This document describes a YANG data model for TE network topologies that are network service and function aware. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on September 2, 2018. Copyright Notice Copyright (c) 2018 IETF Trust and the persons identified as the document authors. All rights reserved. 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 respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Bryskin & Liu Expires September 2, 2018 [Page 1] Internet-Draft SF Aware Topo YANG Model March 2018 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3 1.2. Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . 3 1.3. Prefixes in Data Node Names . . . . . . . . . . . . . . . 3 2. Modeling Considerations . . . . . . . . . . . . . . . . . . . 3 3. Model Structure . . . . . . . . . . . . . . . . . . . . . . . 4 4. YANG Modules . . . . . . . . . . . . . . . . . . . . . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13 6. Security Considerations . . . . . . . . . . . . . . . . . . . 14 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 14 7.1. Normative References . . . . . . . . . . . . . . . . . . 14 7.2. Informative References . . . . . . . . . . . . . . . . . 15 Appendix A. Companion YANG Model for Non-NMDA Compliant Implementations . . . . . . . . . . . . . . . . . . 16 A.1. SF Aware TE Topology State Module . . . . . . . . . . . . 16 Appendix B. Data Examples . . . . . . . . . . . . . . . . . . . 18 B.1. A Topology with Multiple Connected Network Functions . . 18 B.2. A Topology with an Encapsulated Network Service . . . . . 23 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 27 1. Introduction Today a network offers to its clients far more services than just connectivity across the network. Large variety of physical, logical and/or virtual service functions, network functions and transport functions (collectively named in this document as SFs) could be allocated for and assigned to a client. As described in [I-D.bryskin-teas-use-cases-sf-aware-topo-model], there are some important use cases, in which the network needs to represent to the client SFs at the client's disposal as topological elements in relation to other elements of a topology (i.e. nodes, links, link and tunnel termination points) used by the network to describe itself to the client. Not only would such information allow for the client to auto-discover the network's SFs available for the services provisioned for the client, it would also allow for the client selecting the SFs, duel-optimizing the selection on the SF location on the network and connectivity means (e.g. TE tunnels) to inter- connect the SFs. Consequently thus would give to both the network and the client powerful means for the service function chain (SFC [RFC7498] [RFC7665]) negotiation to achieve most efficient and cost effective (from the network point of view) and most optimal yet satisfying all necessary constraints of SFCs(from the client's point of view). This document defines a YANG data model that allows service functions to be represented along with TE topology elements. Bryskin & Liu Expires September 2, 2018 [Page 2] Internet-Draft SF Aware Topo YANG Model March 2018 1.1. Terminology The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, [RFC2119]. The following terms are defined in [RFC7950] and are not redefined here: o augment o data model o data node 1.2. Tree Diagrams A simplified graphical representation of the data model is presented in this document, by using the tree format defined in [I-D.ietf-netmod-yang-tree-diagrams]. 1.3. Prefixes in Data Node Names In this document, names of data nodes, actions, and other data model objects are often used without a prefix, as long as it is clear from the context in which YANG module each name is defined. Otherwise, names are prefixed using the standard prefix associated with the corresponding YANG module, as shown in Table 1. +--------+------------------+-----------------------------------+ | Prefix | YANG module | Reference | +--------+------------------+-----------------------------------+ | inet | ietf-inet-types | [RFC6991] | | nw | ietf-network | [I-D.ietf-i2rs-yang-network-topo] | | nt | ietf-network- | [I-D.ietf-i2rs-yang-network-topo] | | | topology | | | tet | ietf-te-topology | [I-D.ietf-teas-yang-te-topo] | +--------+------------------+-----------------------------------+ Table 1: Prefixes and Corresponding YANG Modules 2. Modeling Considerations The model introduced in this document is an augmentation of the TE Topology model defined in [I-D.ietf-teas-yang-te-topo]. SFs are modeled as child elements of a TE node similarly to how Link Termination Points (LTPs) and Tunnel Termination Points (TTPs) are Bryskin & Liu Expires September 2, 2018 [Page 3] Internet-Draft SF Aware Topo YANG Model March 2018 modeled in the TE Topology model. The SFs are defined as opaque objects identified via topology unique service-function-id's. Each SF has one or more Connection Points (CPs) identified via SF-unique sf-connection-point-id's, over which the SF could be connected to other SFs resided on the same TE node, as well as to other elements of the TE node, in particular, to the node's LTPs and/or TTPs. An interested client may use service-function-id's to look up the SFs in TOSCA or YANG data store(s) defined by [ETSI-NFV-MAN] to retrieve the details of the SFs, for example, to understand the SF's mutual substitutability. The TE Topology model introduces a concept of Connectivity Matrix (CM), and uses the CM to describe which and at what costs a TE node's LTPs could be inter-connected internally across the TE node. The model defined in this document heavily uses the same concept to describe the SF connectivity via introducing 3 additional CMs: 1. SF2SF CM. This CM describes which pairs of SFs could be locally inter-connected, and, if yes, in which direction, via which CPs and at what costs. In other words, the SF2SF CM describes how SFs residing on the same TE node could be inter-connected into local from the TE node's perspective SFCs; 2. SF2LTP CM. This CM describes how, in which direction and at what costs the TE node's SFs could be connected to the TE node's LTPs and hence to SFs residing on neighboring TE nodes that are connected to LTPs at the remote ends of corresponding TE links; 3. SF2TTP CM. This CM describes how, in which direction and at what costs the TE node's SFs could be connected to the TE node's TTPs and hence to SFs residing on other TE nodes on the topology that could be inter-connected with the TE node in question via TE tunnels terminated by the corresponding TTPs. In addition to SF2SF CM, the local SF chaining could be described with the help of ETSI models Virtual Links (VLs) [ETSI-NFV-MAN]. This option is especially useful when the costs of the local chaining are negligible as compared to ones of the end-to-end SFCs said local SFCs are part of. 3. Model Structure module: ietf-te-topology-sf augment /nw:networks/nw:network/nw:network-types/tet:te-topology: +--rw sf! augment /nw:networks/nw:network/nw:node/tet:te /tet:te-node-attributes: +--rw service-function Bryskin & Liu Expires September 2, 2018 [Page 4] Internet-Draft SF Aware Topo YANG Model March 2018 +--rw connectivity-matrices | +--rw connectivity-matrix* [id] | +--rw id uint32 | +--rw from | | +--rw service-function-id? string | | +--rw sf-connection-point-id? string | +--rw to | | +--rw service-function-id? string | | +--rw sf-connection-point-id? string | +--rw enabled? boolean | +--rw direction? connectivity-direction | +--rw virtual-link-id? string +--rw link-terminations +--rw link-termination* [id] +--rw id uint32 +--rw from | +--rw tp-ref? -> ../../../../../../.. /nt:termination-point/tp-id +--rw to | +--rw service-function-id? string | +--rw sf-connection-point-id? string +--rw enabled? boolean +--rw direction? connectivity-direction augment /nw:networks/nw:network/nw:node/tet:te /tet:information-source-entry: +--ro service-function +--ro connectivity-matrices | +--ro connectivity-matrix* [id] | +--ro id uint32 | +--ro from | | +--ro service-function-id? string | | +--ro sf-connection-point-id? string | +--ro to | | +--ro service-function-id? string | | +--ro sf-connection-point-id? string | +--ro enabled? boolean | +--ro direction? connectivity-direction | +--ro virtual-link-id? string +--ro link-terminations +--ro link-termination* [id] +--ro id uint32 +--ro from +--ro to | +--ro service-function-id? string | +--ro sf-connection-point-id? string +--ro enabled? boolean +--ro direction? connectivity-direction augment /nw:networks/nw:network/nw:node/tet:te Bryskin & Liu Expires September 2, 2018 [Page 5] Internet-Draft SF Aware Topo YANG Model March 2018 /tet:tunnel-termination-point: +--rw service-function +--rw tunnel-terminations +--rw tunnel-termination* [id] +--rw id uint32 +--rw service-function-id? string +--rw sf-connection-point-id? string +--rw enabled? boolean +--rw direction? connectivity-direction 4. YANG Modules file "ietf-te-topology-sf@2018-02-27.yang" module ietf-te-topology-sf { yang-version 1; namespace "urn:ietf:params:xml:ns:yang:ietf-te-topology-sf"; prefix "tet-sf"; import ietf-network { prefix "nw"; } import ietf-network-topology { prefix "nt"; } import ietf-te-topology { prefix "tet"; } organization "Traffic Engineering Architecture and Signaling (TEAS) Working Group"; contact "WG Web: WG List: Editors: Igor Bryskin Xufeng Liu "; description Bryskin & Liu Expires September 2, 2018 [Page 6] Internet-Draft SF Aware Topo YANG Model March 2018 "Network service and function aware aware TE topology model. Copyright (c) 2018 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info)."; revision 2018-02-27 { description "Initial revision"; reference "TBD"; } /* * Typedefs */ typedef connectivity-direction { type enumeration { enum "to" { description "The direction is uni-directional, towards the 'to' entity direction."; } enum "from" { description "The direction is uni-directional, from the 'to' entity direction."; } enum "bidir" { description "The direction is bi-directional."; } } description "A type used to indicates whether a connectivity is uni-directional, or bi-directional. If the relation is uni-directional, the value of this type indicates the direction."; } // connectivity-direction /* * Groupings */ grouping service-function-node-augmentation { Bryskin & Liu Expires September 2, 2018 [Page 7] Internet-Draft SF Aware Topo YANG Model March 2018 description "Augmenting a TE node to be network service and function aware."; container service-function { description "Containing attributes related to network services and network functions"; container connectivity-matrices { description "Connectivity relations between network services/functions on a TE node, which can be either abstract or physical."; reference "ETSI GS NFV-MAN 01: Network Functions Virtualisation (NFV); Management and Orchestration. RFC7665: Service Function Chaining (SFC) Architecture."; list connectivity-matrix { key "id"; description "Represents the connectivity relations between network services/functions on a TE node."; leaf id { type uint32; description "Identifies the connectivity-matrix entry."; } container from { description "Reference to the source network service or network function."; leaf service-function-id { type string; description "Reference to a network service or a network function."; } leaf sf-connection-point-id { type string; description "Reference to a connection point on a network service or a network function."; } } // from container to { description "Reference to the destination network service or network function."; leaf service-function-id { type string; Bryskin & Liu Expires September 2, 2018 [Page 8] Internet-Draft SF Aware Topo YANG Model March 2018 description "Reference to a network service or a network function."; } leaf sf-connection-point-id { type string; description "Reference to a connection point on a network service or a network function."; } } // to leaf enabled { type boolean; description "'true' if this connectivity entry is enabled."; } leaf direction { type connectivity-direction; description "Indicates whether this connectivity is uni-directional, or bi-directional. If the relation is uni-directional, the value of this leaf indicates the direction."; } leaf virtual-link-id { type string; description "Reference to a virtual link that models this conectivity relation in the network function model."; } } // connectivity-matrix } // connectivity-matrices container link-terminations { description "Connectivity relations between network services/functions and link termination points on a TE node, which can be either abstract or physical."; reference "ETSI GS NFV-MAN 01: Network Functions Virtualisation (NFV); Management and Orchestration. RFC7665: Service Function Chaining (SFC) Architecture."; list link-termination { key "id"; description "Each entry of the list represents the connectivity relation between a network service/function and Bryskin & Liu Expires September 2, 2018 [Page 9] Internet-Draft SF Aware Topo YANG Model March 2018 a link termination point on a TE node."; leaf id { type uint32; description "Identifies the termination entry."; } container from { description "Reference to the link termination point."; } // from container to { description "Reference to the network service or network function."; leaf service-function-id { type string; description "Reference to a network service or a network function."; } leaf sf-connection-point-id { type string; description "Reference to a connection point on a network service or a network function."; } } // to leaf enabled { type boolean; description "'true' if this connectivity entry is enabled."; } leaf direction { type connectivity-direction; description "Indicates whether this connectivity is uni-directional, or bi-directional. If the relation is uni-directional, the value of this leaf indicates the direction."; } } // link-termination } } } // service-function-node-augmentation grouping service-function-ttp-augmentation { description "Augmenting a tunnel termination point to be network service Bryskin & Liu Expires September 2, 2018 [Page 10] Internet-Draft SF Aware Topo YANG Model March 2018 aware."; container service-function { description "Containing attributes related to network services and network functions"; container tunnel-terminations { description "Connectivity relations between network services/functions and tunnel termination points on a TE node, which can be either abstract or physical."; reference "ETSI GS NFV-MAN 01: Network Functions Virtualisation (NFV); Management and Orchestration. RFC7665: Service Function Chaining (SFC) Architecture."; list tunnel-termination { key "id"; description "Each entry of the list represents the connectivity relation between a network service/function and a tunnel termination point on a TE node."; leaf id { type uint32; description "Identifies the termination entry."; } leaf service-function-id { type string; description "Reference to a network service or a network function."; } leaf sf-connection-point-id { type string; description "Reference to a connection point on a network service or a network function."; } leaf enabled { type boolean; description "'true' if this connectivity entry is enabled."; } leaf direction { type connectivity-direction; description "Indicates whether this connectivity is uni-directional, or bi-directional. If the relation is uni-directional, the value of Bryskin & Liu Expires September 2, 2018 [Page 11] Internet-Draft SF Aware Topo YANG Model March 2018 this leaf indicates the direction."; } } // link-termination } } } // service-function-ttp-augmentation grouping sf-topology-type { description "Identifies the SF aware TE topology type."; container sf { presence "Indidates that the TE topology is SF aware."; description "Its presence identifies that the TE topology is SF aware."; } } // sf-topology-type /* * Augmentations */ /* Augmentations to network-types/te-topology */ augment "/nw:networks/nw:network/nw:network-types/" + "tet:te-topology" { description "Defines the SF aware TE topology type."; uses sf-topology-type; } /* Augmentations to te-node-attributes */ augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes" { description "Parameters for SF aware TE topology."; uses service-function-node-augmentation; } augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:information-source-entry" { description "Parameters for SF aware TE topology."; uses service-function-node-augmentation; } /* Augmentations to tunnel-termination-point */ augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:tunnel-termination-point" { description "Parameters for SF aware TE topology."; Bryskin & Liu Expires September 2, 2018 [Page 12] Internet-Draft SF Aware Topo YANG Model March 2018 uses service-function-ttp-augmentation; } /* Augmentations to connectivity-matrix */ augment "/nw:networks/nw:network/nw:node/tet:te/" + "tet:te-node-attributes/tet-sf:service-function/" + "tet-sf:link-terminations/tet-sf:link-termination/" + "tet-sf:from" { description "Add reference to the link termination point. This portion cannot be shared with the state module."; leaf tp-ref { type leafref { path "../../../../../../../nt:termination-point/" + "nt:tp-id"; } description "Reference to the link termination point."; } } } 5. IANA Considerations RFC Ed.: In this section, replace all occurrences of 'XXXX' with the actual RFC number (and remove this note). This document registers the following namespace URIs in the IETF XML registry [RFC3688]: -------------------------------------------------------------------- URI: urn:ietf:params:xml:ns:yang:ietf-te-topology-sf Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. -------------------------------------------------------------------- -------------------------------------------------------------------- URI: urn:ietf:params:xml:ns:yang:ietf-te-topology-sf-state Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. -------------------------------------------------------------------- This document registers the following YANG modules in the YANG Module Names registry [RFC7950]: Bryskin & Liu Expires September 2, 2018 [Page 13] Internet-Draft SF Aware Topo YANG Model March 2018 -------------------------------------------------------------------- name: ietf-te-topology-sf namespace: urn:ietf:params:xml:ns:yang:ietf-te-topology-packet prefix: tet-sf reference: RFC XXXX -------------------------------------------------------------------- -------------------------------------------------------------------- name: ietf-te-topology-sf-state namespace: urn:ietf:params:xml:ns:yang:ietf-te-topology-packet-state prefix: tet-sf-s reference: RFC XXXX -------------------------------------------------------------------- 6. Security Considerations The configuration, state, action and notification data defined in this document are designed to be accessed via the NETCONF protocol [RFC6241]. The data-model by itself does not create any security implications. The security considerations for the NETCONF protocol are applicable. The NETCONF protocol used for sending the data supports authentication and encryption. 7. References 7.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011, . [RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, July 2013, . [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, August 2016, . Bryskin & Liu Expires September 2, 2018 [Page 14] Internet-Draft SF Aware Topo YANG Model March 2018 [ETSI-NFV-MAN] ETSI, "Network Functions Virtualisation (NFV); Management and Orchestration", ETSI GS NFV-MAN 001 V1.1.1, December 2014. [I-D.bryskin-teas-use-cases-sf-aware-topo-model] Bryskin, I., Liu, X., Guichard, J., Lee, Y., Contreras, L., and D. Ceccarelli, "Use Cases for SF Aware Topology Models", draft-bryskin-teas-use-cases-sf-aware-topo- model-01 (work in progress), October 2017. [I-D.ietf-i2rs-yang-network-topo] Clemm, A., Medved, J., Varga, R., Bahadur, N., Ananthakrishnan, H., and X. Liu, "A Data Model for Network Topologies", draft-ietf-i2rs-yang-network-topo-20 (work in progress), December 2017. [I-D.ietf-teas-yang-te-topo] Liu, X., Bryskin, I., Beeram, V., Saad, T., Shah, H., and O. Dios, "YANG Data Model for Traffic Engineering (TE) Topologies", draft-ietf-teas-yang-te-topo-14 (work in progress), February 2018. [I-D.ietf-netmod-revised-datastores] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture", draft-ietf-netmod-revised-datastores-10 (work in progress), January 2018. 7.2. Informative References [RFC7498] Quinn, P., Ed. and T. Nadeau, Ed., "Problem Statement for Service Function Chaining", RFC 7498, DOI 10.17487/RFC7498, April 2015, . [RFC7665] Halpern, J., Ed. and C. Pignataro, Ed., "Service Function Chaining (SFC) Architecture", RFC 7665, DOI 10.17487/RFC7665, October 2015, . [I-D.ietf-netmod-yang-tree-diagrams] Bjorklund, M. and L. Berger, "YANG Tree Diagrams", draft- ietf-netmod-yang-tree-diagrams-06 (work in progress), February 2018. Bryskin & Liu Expires September 2, 2018 [Page 15] Internet-Draft SF Aware Topo YANG Model March 2018 Appendix A. Companion YANG Model for Non-NMDA Compliant Implementations The YANG module ietf-te-topology-sf defined in this document is designed to be used in conjunction with implementations that support the Network Management Datastore Architecture (NMDA) defined in [I-D.ietf-netmod-revised-datastores]. In order to allow implementations to use the model even in cases when NMDA is not supported, the following companion module, ietf-te-topology-sf-state, is defined as state model, which mirrors the module ietf-te-topology- sf defined earlier in this document. However, all data nodes in the companion module are non-configurable, to represent the applied configuration or the derived operational states. The companion module, ietf-te-topology-sf-state, is redundant and SHOULD NOT be supported by implementations that support NMDA. As the structure of the companion module mirrors that of the coorespinding NMDA model, the YANG tree of the companion module is not depicted separately. A.1. SF Aware TE Topology State Module file "ietf-te-topology-sf-state@2018-02-27.yang" module ietf-te-topology-sf-state { yang-version 1; namespace "urn:ietf:params:xml:ns:yang:ietf-te-topology-sf-state"; prefix "tet-sf-s"; import ietf-te-topology-sf { prefix "tet-sf"; } import ietf-network-state { prefix "nw-s"; } import ietf-network-topology-state { prefix "nt-s"; } import ietf-te-topology-state { prefix "tet-s"; } organization "Traffic Engineering Architecture and Signaling (TEAS) Bryskin & Liu Expires September 2, 2018 [Page 16] Internet-Draft SF Aware Topo YANG Model March 2018 Working Group"; contact "WG Web: WG List: Editors: Igor Bryskin Xufeng Liu "; description "Network service and function aware aware TE topology operational state model for non-NMDA compliant implementations. Copyright (c) 2018 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Simplified BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info)."; revision 2018-02-27 { description "Initial revision"; reference "TBD"; } /* * Augmentations */ /* Augmentations to network-types/te-topology */ augment "/nw-s:networks/nw-s:network/nw-s:network-types/" + "tet-s:te-topology" { description "Defines the SF aware TE topology type."; uses tet-sf:sf-topology-type; } /* Augmentations to connectivity-matrix */ augment "/nw-s:networks/nw-s:network/nw-s:node/tet-s:te/" + "tet-s:te-node-attributes" { description "Parameters for SF aware TE topology."; uses tet-sf:service-function-node-augmentation; Bryskin & Liu Expires September 2, 2018 [Page 17] Internet-Draft SF Aware Topo YANG Model March 2018 } augment "/nw-s:networks/nw-s:network/nw-s:node/tet-s:te/" + "tet-s:information-source-entry" { description "Parameters for SF aware TE topology."; uses tet-sf:service-function-node-augmentation; } /* Augmentations to tunnel-termination-point */ augment "/nw-s:networks/nw-s:network/nw-s:node/tet-s:te/" + "tet-s:tunnel-termination-point" { description "Parameters for SF aware TE topology."; uses tet-sf:service-function-ttp-augmentation; } /* Augmentations to connectivity-matrix */ augment "/nw-s:networks/nw-s:network/nw-s:node/tet-s:te/" + "tet-s:te-node-attributes/tet-sf-s:service-function/" + "tet-sf-s:link-terminations/tet-sf-s:link-termination/" + "tet-sf-s:from" { description "Add reference to the link termination point. This portion cannot be shared with the state module."; leaf tp-ref { type leafref { path "../../../../../../../nt-s:termination-point/" + "nt-s:tp-id"; } description "Reference to the link termination point."; } } } Appendix B. Data Examples B.1. A Topology with Multiple Connected Network Functions Bryskin & Liu Expires September 2, 2018 [Page 18] Internet-Draft SF Aware Topo YANG Model March 2018 Node-1 +----o--o--------------------------o-------+ | | | | | | \__/ \__ | | *\/ TTP-1 * * * * * * * * * *\/* | LTP-4 |* * * * TTP-2 * | LTP-1 o------------*-----------------------------o | * * | LTP-3 |* * * * * *| LTP-2 o--- -----o | \ / | | \ / | | \ CP01 CP02/ | | +----o--------------------------o------+ | | | VL1| VL4| | | | | |CP11 |CP33 | | | | +-o--+ +----+ +-o--+ | | | | |VNF1| |VNF2| |VNF3| | | | | +-o-o+ VL2 +--o-+ VL2 +-o-o+ | | | |CP12| |\----------/ \---------/| |CP32| | | | | |CP13 CP21 CP31| | | | | | | | VL2 | | | | | | | +------------------------+ | | | | | +----------------------------+ | | | | VL3 | | | | Network Service 1 | | | +--------------------------------------+ | +------------------------------------------+ The configuration instance data for Node-1 in the above figure could be as follows: { "networks": { "network": [ { "network-types": { "te-topology": { "sf": {} } }, "network-id": "network-sf-aware", "provider-id": 201, "client-id": 300, "te-topology-id": "te-topology:network-sf-aware", "node": [ { "node-id": "Node-1", Bryskin & Liu Expires September 2, 2018 [Page 19] Internet-Draft SF Aware Topo YANG Model March 2018 "te-node-id": "2.0.1.1", "te": { "te-node-attributes": { "domain-id": 1, "is-abstract": [null], "connectivity-matrices": { }, "service-function": { "connectivity-matrices": { "connectivity-matrix": [ { "id": 10, "from": { "service-function-id": "Network Service 1", "sf-connection-point-id": "CP01" }, "to": { "service-function-id": "VNF1", "sf-connection-point-id": "CP11" } "direction": "bidir", "virtual-link-id": "VL1" }, { "id": 13, "from": { "service-function-id": "VNF1", "sf-connection-point-id": "CP12" }, "to": { "service-function-id": "VNF3", "sf-connection-point-id": "CP32" } "direction": "bidir", "virtual-link-id": "VL3" }, { "id": 12, "from": { "service-function-id": "VNF1", "sf-connection-point-id": "CP13" }, "to": { "service-function-id": "VNF2", "sf-connection-point-id": "CP21" } "direction": "bidir", "virtual-link-id": "VL2" Bryskin & Liu Expires September 2, 2018 [Page 20] Internet-Draft SF Aware Topo YANG Model March 2018 }, { "id": 23, "from": { "service-function-id": "VNF2", "sf-connection-point-id": "CP21" }, "to": { "service-function-id": "VNF3" "sf-connection-point-id": "CP31" } "direction": "bidir", "virtual-link-id": "VL2" }, { "id": 30, "from": { "service-function-id": "Network Service 1", "sf-connection-point-id": "CP02" }, "to": { "service-function-id": "VNF3", "sf-connection-point-id": "CP33" } "direction": "bidir", "virtual-link-id": "VL4" } ] }, "link-terminations": { "link-termination": [ { "id": 2, "from": { "tp-ref": "LTP-2" }, "to": { "service-function-id": "Network Service 1", "sf-connection-point-id": "CP02" } "direction": "bidir" }, { "id": 3, "from": { "tp-ref": "LTP-3" }, "to": { Bryskin & Liu Expires September 2, 2018 [Page 21] Internet-Draft SF Aware Topo YANG Model March 2018 "service-function-id": "Network Service 1", "sf-connection-point-id": "CP01" } "direction": "bidir" } ] } } } "tunnel-termination-point": [ { "tunnel-tp-id": 10001, "name": "TTP-1", "service-function-terminations": { } }, { "tunnel-tp-id": 10002, "name": "TTP-2", "service-function-terminations": { } } ] }, "termination-point": [ { "tp-id": "LTP-1", "te-tp-id": 10001 "te": { "interface-switching-capability": [ { "switching-capability": "switching-l2sc", "encoding": "lsp-encoding-ethernet" } ] } }, { "tp-id": "LTP-2", "te-tp-id": 10002 "te": { "interface-switching-capability": [ { "switching-capability": "switching-l2sc", "encoding": "lsp-encoding-ethernet" } ] } Bryskin & Liu Expires September 2, 2018 [Page 22] Internet-Draft SF Aware Topo YANG Model March 2018 }, { "tp-id": "LTP-3", "te-tp-id": 10003 "te": { "interface-switching-capability": [ { "switching-capability": "switching-l2sc", "encoding": "lsp-encoding-ethernet" } ] } }, { "tp-id": "LTP-4", "te-tp-id": 10004 "te": { "interface-switching-capability": [ { "switching-capability": "switching-l2sc", "encoding": "lsp-encoding-ethernet" } ] } } ] } ] } ] } } B.2. A Topology with an Encapsulated Network Service In this example, a network service consists of several inter- connected network functions (NFs), and is represented by this model as an encapsulated opaque object without the details between its internals. Bryskin & Liu Expires September 2, 2018 [Page 23] Internet-Draft SF Aware Topo YANG Model March 2018 Node-1 +----o--o--------------------------o-------+ | | | | | | \__/ \__ | | *\/ TTP-1 * * * * * * * * * *\/* | LTP-4 |* * * * TTP-2 * | LTP-1 o------------*-----------------------------o | * * | LTP-3 |* * * * * *| LTP-2 o--- -----o | \ / | | \ / | | \ CP01 CP02/ | | +----o--------------------------o------+ | | | | | | | Network Service 1 | | | +--------------------------------------+ | +------------------------------------------+ The configuration instance data for Node-1 in the above figure could be as follows: { "networks": { "network": [ { "network-types": { "te-topology": { "sf": {} } }, "network-id": "network-sf-aware", "provider-id": 201, "client-id": 300, "te-topology-id": "te-topology:network-sf-aware", "node": [ { "node-id": "Node-1", "te-node-id": "2.0.1.1", "te": { "te-node-attributes": { "domain-id": 1, "is-abstract": [null], "connectivity-matrices": { }, "service-function": { "connectivity-matrices": { }, Bryskin & Liu Expires September 2, 2018 [Page 24] Internet-Draft SF Aware Topo YANG Model March 2018 "link-terminations": { "link-termination": [ { "id": 2, "from": { "tp-ref": "LTP-2" }, "to": { "service-function-id": "Network Service 1", "sf-connection-point-id": "CP02" } "direction": "bidir" }, { "id": 3, "from": { "tp-ref": "LTP-3" }, "to": { "service-function-id": "Network Service 1", "sf-connection-point-id": "CP01" } "direction": "bidir" } ] } } } "tunnel-termination-point": [ { "tunnel-tp-id": 10001, "name": "TTP-1", "service-function-terminations": { } }, { "tunnel-tp-id": 10002, "name": "TTP-2", "service-function-terminations": { } } ] }, "termination-point": [ { "tp-id": "LTP-1", "te-tp-id": 10001 "te": { Bryskin & Liu Expires September 2, 2018 [Page 25] Internet-Draft SF Aware Topo YANG Model March 2018 "interface-switching-capability": [ { "switching-capability": "switching-l2sc", "encoding": "lsp-encoding-ethernet" } ] } }, { "tp-id": "LTP-2", "te-tp-id": 10002 "te": { "interface-switching-capability": [ { "switching-capability": "switching-l2sc", "encoding": "lsp-encoding-ethernet" } ] } }, { "tp-id": "LTP-3", "te-tp-id": 10003 "te": { "interface-switching-capability": [ { "switching-capability": "switching-l2sc", "encoding": "lsp-encoding-ethernet" } ] } }, { "tp-id": "LTP-4", "te-tp-id": 10004 "te": { "interface-switching-capability": [ { "switching-capability": "switching-l2sc", "encoding": "lsp-encoding-ethernet" } ] } } ] } ] } Bryskin & Liu Expires September 2, 2018 [Page 26] Internet-Draft SF Aware Topo YANG Model March 2018 ] } } Authors' Addresses Igor Bryskin Huawei Technologies EMail: Igor.Bryskin@huawei.com Xufeng Liu Jabil EMail: Xufeng_Liu@jabil.com Bryskin & Liu Expires September 2, 2018 [Page 27]