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Internet Engineering Task Force (IETF) L. BergerRequest for Comments: 8530 C. HoppsCategory: Standards Track LabN Consulting, L.L.C.ISSN: 2070-1721 A. Lindem Cisco Systems D. Bogdanovic X. Liu Volta Networks March 2019YANG Model for Logical Network ElementsAbstract This document defines a logical network element (LNE) YANG module that is compliant with the Network Management Datastore Architecture (NMDA). This module can be used to manage the logical resource partitioning that may be present on a network device. Examples of common industry terms for logical resource partitioning are logical systems or logical routers. The YANG model in this document conforms with NMDA as defined inRFC 8342.Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available inSection 2 of RFC 7841. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained athttps://www.rfc-editor.org/info/rfc8530.Berger, et al. Standards Track [Page 1]
RFC 8530 YANG LNEs March 2019Copyright Notice Copyright (c) 2019 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject toBCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://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.Table of Contents1. Introduction . . . . . . . . . . . . . . . . . . . . . . . .31.1. Terminology . . . . . . . . . . . . . . . . . . . . . . .42. Overview . . . . . . . . . . . . . . . . . . . . . . . . . .43. Logical Network Elements . . . . . . . . . . . . . . . . . .53.1. LNE Instantiation and Resource Assignment . . . . . . . .63.2. LNE Management -- LNE View . . . . . . . . . . . . . . .73.3. LNE Management -- Host Network Device View . . . . . . .74. Security Considerations . . . . . . . . . . . . . . . . . . .95. IANA Considerations . . . . . . . . . . . . . . . . . . . . .106. Logical Network Element Model . . . . . . . . . . . . . . . .107. References . . . . . . . . . . . . . . . . . . . . . . . . .147.1. Normative References . . . . . . . . . . . . . . . . . .147.2. Informative References . . . . . . . . . . . . . . . . .15Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . .17A.1. Example: Host-Device-Managed LNE . . . . . . . . . . . .17A.1.1. Configuration Data . . . . . . . . . . . . . . . . .21A.1.2. State Data . . . . . . . . . . . . . . . . . . . . .25A.2. Example: Self-Managed LNE . . . . . . . . . . . . . . . .33A.2.1. Configuration Data . . . . . . . . . . . . . . . . .36A.2.2. State Data . . . . . . . . . . . . . . . . . . . . .39 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .49 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . .49Berger, et al. Standards Track [Page 2]
RFC 8530 YANG LNEs March 20191. Introduction This document defines an NMDA-compliant YANG module [RFC6020] to support the creation of logical network elements (LNEs) on a network device. An LNE is an independently managed virtual device made up of resources allocated to it from the host or parent network device. An LNE running on a host network device conceptually parallels a virtual machine running on a host system. Using host-virtualization terminology, one could refer to an LNE as a "Guest" and the containing network device as the "Host". While LNEs may be implemented via host-virtualization technologies, this is not a requirement. The YANG model in this document conforms with the Network Management Datastore Architecture defined in [RFC8342]. This document also defines the necessary augmentations for allocating host resources to a given LNE. As the interface management model [RFC8343] is the only module that currently defines host resources, this document currently defines only a single augmentation to cover the assignment of interfaces to an LNE. Future modules that define support for the control of host device resources are expected to, where appropriate, provide parallel support for the assignment of controlled resources to LNEs. As each LNE is an independently managed device, each will have its own set of YANG-modeled data that is independent of the host device and other LNEs. For example, multiple LNEs may all have their own "Tunnel0" interface defined, which will not conflict with each other and will not exist in the host's interface model. An LNE will have its own management interfaces, possibly including independent instances of NETCONF/RESTCONF/etc servers to support the configuration of their YANG models. As an example of this independence, an implementation may choose to completely rename assigned interfaces; so, on the host, the assigned interface might be called "Ethernet0/1" while within the LNE it might be called "eth1". In addition to standard management interfaces, a host device implementation may support accessing LNE configuration and operational YANG models directly from the host system. When supported, such access is accomplished through a yang-schema-mount mount point [RFC8528] under which the root-level LNE YANG models may be accessed. Examples of vendor terminology for an LNE include logical system or logical router and virtual switch, chassis, or fabric.Berger, et al. Standards Track [Page 3]
RFC 8530 YANG LNEs March 20191.1. Terminology 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 inBCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. Readers are expected to be familiar with terms and concepts of YANG [RFC7950] and YANG Schema Mount [RFC8528]. This document uses the graphical representation of data models defined in YANG Tree Diagrams [RFC8340].2. Overview In this document, we consider network devices that support protocols and functions defined within the IETF Routing Area, e.g., routers, firewalls, and hosts. Such devices may be physical or virtual, e.g., a classic router with custom hardware or one residing within a server-based virtual machine implementing a virtual network function (VNF). Each device may subdivide their resources into LNEs, each of which provides a managed logical device. Examples of vendor terminology for an LNE include logical system or logical router and virtual switch, chassis, or fabric. Each LNE may also support VPN Routing and Forwarding (VRF) and Virtual Switching Instance (VSI) functions, which are referred to below as Network Instances (NIs). This breakdown is represented in Figure 1. ,'''''''''''''''''''''''''''''''''''''''''''''''. | Network Device (Physical or Virtual) | | ..................... ..................... | | : Logical Network : : Logical Network : | | : Element : : Element : | | :+-----+-----+-----+: :+-----+-----+-----+: | | :| Net | Net | Net |: :| Net | Net | Net |: | | :|Inst.|Inst.|Inst.|: :|Inst.|Inst.|Inst.|: | | :+-----+-----+-----+: :+-----+-----+-----+: | | : | | | | | | : : | | | | | | : | | :..|.|...|.|...|.|..: :..|.|...|.|...|.|..: | | | | | | | | | | | | | | | ''''|'|'''|'|'''|'|'''''''''|'|'''|'|'''|'|''''' | | | | | | | | | | | | Interfaces Interfaces Figure 1: Module Element RelationshipsBerger, et al. Standards Track [Page 4]
RFC 8530 YANG LNEs March 2019 A model for LNEs is described inSection 3, and the model for NIs is covered in [RFC8529]. The interface management model [RFC8343] is an existing model that is impacted by the definition of LNEs and NIs. This document and [RFC8529] define augmentations to the interface model to support LNEs and NIs. Similar elements, although perhaps only for LNEs, may also need to be included as part of the definition of the future hardware and QoS modules. Interfaces are a crucial part of any network device's configuration and operational state. They generally include a combination of raw physical interfaces, link-layer interfaces, addressing configuration, and logical interfaces that may not be tied to any physical interface. Several system services, and Layer 2 and Layer 3 protocols, may also associate configuration or operational state data with different types of interfaces (these relationships are not shown for simplicity). The interface management model is defined by [RFC8343]. The logical-network-element module augments existing interface management models by adding an identifier that is used on interfaces to identify an associated LNE. The interface-related augmentation is as follows: module: ietf-logical-network-element augment /if:interfaces/if:interface: +--rw bind-lne-name? -> /logical-network-elements/logical-network-element/name The interface model defined in [RFC8343] is structured to include all interfaces in a flat list, without regard to logical assignment of resources supported on the device. The bind-lne-name and leaf provides the association between an interface and its associated LNE. Note that as currently defined, to assign an interface to both an LNE and NI, the interface would first be assigned to the LNE and then within that LNE's interface model, the LNE's representation of that interface would be assigned to an NI using the mechanisms defined in [RFC8529].3. Logical Network Elements Logical network elements support the ability of some devices to partition resources into independent logical routers and/or switches. Device support for multiple logical network elements is implementation specific. Systems without such capabilities need not include support for the logical-network-element module. In physical devices, some hardware features are shared across partitions, but control-plane (e.g., routing) protocol instances, tables, andBerger, et al. Standards Track [Page 5]
RFC 8530 YANG LNEs March 2019 configuration are managed separately. For example, in logical routers or VNFs, this may correspond to establishing multiple logical instances using a single software installation. The model supports configuration of multiple instances on a single device by creating a list of logical network elements, each with their own configuration and operational state related to routing and switching protocols. The LNE model can be represented as: module: ietf-logical-network-element +--rw logical-network-elements +--rw logical-network-element* [name] +--rw name string +--rw managed? boolean +--rw description? string +--mp root augment /if:interfaces/if:interface: +--rw bind-lne-name? -> /logical-network-elements/logical-network-element/name notifications: +---n bind-lne-name-failed +--ro name -> /if:interfaces/interface/name +--ro bind-lne-name | -> /if:interfaces/interface/lne:bind-lne-name +--ro error-info? string 'name' identifies the logical network element. 'managed' indicates if the server providing the host network device will provide the client LNE information via the 'root' structure. The root of an LNE's specific data is the schema mount point 'root'. bind-lne-name is used to associate an interface with an LNE, and bind-lne-name- failed is used in certain failure cases. An LNE root MUST contain at least the YANG library [RFC7895] and interface module [RFC8343].3.1. LNE Instantiation and Resource Assignment Logical network elements may be controlled by clients using existing list operations. When list entries are created, a new LNE is instantiated. The models mounted under an LNE root are expected to be dependent on the server implementation. When a list entry is deleted, an existing LNE is destroyed. For more information, see[RFC7950], Section 7.8.6. Once instantiated, host network device resources can be associated with the new LNE. As previously mentioned, this document augmentsBerger, et al. Standards Track [Page 6]
RFC 8530 YANG LNEs March 2019 ietf-interfaces with the bind-lne-name leaf to support such associations for interfaces. When a bind-lne-name is set to a valid LNE name, an implementation MUST take whatever steps are internally necessary to assign the interface to the LNE or provide an error message (defined below) with an indication of why the assignment failed. It is possible for the assignment to fail while processing the set, or after asynchronous processing. Error notification in the latter case is supported via a notification. On a successful interface assignment to an LNE, an implementation MUST also make the resource available to the LNE by providing a system-created interface to the LNE. The name of the system-created interface is a local matter and may be identical or completely different and mapped from and to the name used in the context of the host device. The system-created interface SHOULD be exposed via the LNE-specific instance of the interface model [RFC8343].3.2. LNE Management -- LNE View Each LNE instance is expected to support management functions from within the context of the LNE root, via a server that provides information with the LNE's root exposed as the device root. Management functions operating within the context of an LNE are accessed through the LNE's standard management interfaces, e.g., NETCONF and SNMP. Initial configuration, much like the initial configuration of the host device, is a local implementation matter. When accessing an LNE via the LNE's management interface, a network device representation will be presented, but its scope will be limited to the specific LNE. Normal YANG/NETCONF mechanisms, together with the required YANG library [RFC7895] instance, can be used to identify the available modules. Each supported module will be presented as a top-level module. Only LNE-associated resources will be reflected in resource-related modules, e.g., interfaces, hardware, and perhaps QoS. From the management perspective, there will be no difference between the available LNE view (information) and a physical network device.3.3. LNE Management -- Host Network Device View There are multiple implementation approaches possible to enable a network device to support the logical-network-element module and multiple LNEs. Some approaches will allow the management functions operating at the network device level to access LNE configuration and operational information, while others will not. Similarly, even when LNE management from the network device is supported by the implementation, it may be prohibited by user policy.Berger, et al. Standards Track [Page 7]
RFC 8530 YANG LNEs March 2019 Independent of the method selected by an implementation, the 'managed' boolean mentioned above is used to indicate when LNE management from the network device context is possible. When the 'managed' boolean is 'false', the LNE cannot be managed by the host system and can only be managed from within the context of the LNE as described inSection 3.2. Attempts to access information below a root node whose associated 'managed' boolean is set to 'false' MUST result in the error message indicated below. In some implementations, it may not be possible to change this value. For example, when an LNE is implemented using virtual machine and traditional hypervisor technologies, it is likely that this value will be restricted to a 'false' value. It is an implementation choice if the information can be accessed and modified from within the context of the LNE, or even the context of the host device. When the 'managed' boolean is 'true', LNE information SHALL be accessible from the context of the host device. When the associated schema-mount definition has the 'config' leaf set to 'true', then LNE information SHALL also be modifiable from the context of the host device. When LNE information is available from both the host device and from within the context of the LNE, the same information MUST be made available via the 'root' element, with paths modified as described in [RFC8528]. An implementation MAY represent an LNE's schema using either the 'inline' or the 'shared-schema' approaches defined in [RFC8528]. The choice of which to use is completely an implementation choice. The inline approach is anticipated to be generally used in the cases where the 'managed' boolean will always be 'false'. The 'shared- schema' approach is expected to be most useful in the case where all LNEs share the same schema. When 'shared-schema' is used with an LNE mount point, the YANG library rooted in the LNE's mount point MUST match the associated schema defined according to the ietf-yang- schema-mount module. Beyond the two modules that will always be present for an LNE, as an LNE is a network device itself, all modules that may be present at the top-level network device MAY also be present for the LNE. The list of available modules is expected to be implementation dependent, as is the method used by an implementation to support LNEs.Appendix A provides example uses of LNEs.Berger, et al. Standards Track [Page 8]
RFC 8530 YANG LNEs March 20194. Security Considerations The YANG modules specified in this document define a schema for data that is designed to be accessed via network management protocols such as NETCONF [RFC6241] or RESTCONF [RFC8040]. The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH) [RFC6242]. The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS [RFC8446]. The Network Configuration Access Control Model (NACM) [RFC8341] 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. LNE information represents device and network configuration information. As such, the security of this information is important, but it is fundamentally no different than any other interface or device configuration information that has already been covered in other documents such as [RFC8343], [RFC7317], and [RFC8349]. The vulnerable "config true" parameters and subtrees are the following: /logical-network-elements/logical-network-element: This list specifies the logical network element and the related logical device configuration. /logical-network-elements/logical-network-element/managed: While this leaf is contained in the previous list, it is worth particular attention as it controls whether information under the LNE mount point is accessible by both the host device and within the LNE context. There may be extra sensitivity to this leaf in environments where an LNE is managed by a different party than the host device, and that party does not wish to share LNE information with the operator of the host device. /if:interfaces/if:interface/bind-lne-name: This leaf indicates the LNE instance to which an interface is assigned. Implementations should pay particular attention to when changes to this leaf are permitted as removal of an interface from an LNE can have a major impact on the LNE's operation as it is similar to physically removing an interface from the device. Implementations can reject a reassignment using the previously described error message generation.Berger, et al. Standards Track [Page 9]
RFC 8530 YANG LNEs March 2019 Unauthorized access to any of these lists can adversely affect the security of both the local device and the network. This may lead to network malfunctions, delivery of packets to inappropriate destinations, and other problems.5. IANA Considerations This document registers a URI in the "IETF XML Registry" [RFC3688]. URI: urn:ietf:params:xml:ns:yang:ietf-logical-network-element Registrant Contact: The IESG. XML: N/A, the requested URI is an XML namespace. This document registers a YANG module in the "YANG Module Names" registry [RFC6020]. name: ietf-logical-network-element namespace: urn:ietf:params:xml:ns:yang:ietf-logical-network-element prefix: lne reference:RFC 85306. Logical Network Element Model The structure of the model defined in this document is described by the YANG module below. <CODE BEGINS> file "ietf-logical-network-element@2019-01-25.yang" module ietf-logical-network-element { yang-version 1.1; // namespace namespace "urn:ietf:params:xml:ns:yang:ietf-logical-network-element"; prefix lne; // import some basic types import ietf-interfaces { prefix if; reference "RFC 8343: A YANG Data Model for Interface Management"; } import ietf-yang-schema-mount { prefix yangmnt; reference "RFC 8528: YANG Schema Mount"; }Berger, et al. Standards Track [Page 10]
RFC 8530 YANG LNEs March 2019 organization "IETF Routing Area (rtgwg) Working Group"; contact "WG Web: <https://datatracker.ietf.org/wg/rtgwg/> WG List: <mailto:rtgwg@ietf.org> Author: Lou Berger <mailto:lberger@labn.net> Author: Christian Hopps <mailto:chopps@chopps.org> Author: Acee Lindem <mailto:acee@cisco.com> Author: Dean Bogdanovic <mailto:ivandean@gmail.com>"; description "This module is used to support multiple logical network elements on a single physical or virtual system. Copyright (c) 2019 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 inSection 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info). This version of this YANG module is part ofRFC 8530; see the RFC itself for full legal notices."; revision 2019-01-25 { description "Initial revision."; reference "RFC 8530: YANG Model for Logical Network Elements"; } // top level device definition statements container logical-network-elements { description "Allows a network device to support multiple logical network element (device) instances."; list logical-network-element {Berger, et al. Standards Track [Page 11]
RFC 8530 YANG LNEs March 2019 key "name"; description "List of logical network elements."; leaf name { type string; description "Device-wide unique identifier for the logical network element."; } leaf managed { type boolean; default "true"; description "True if the host can access LNE information using the root mount point. This value may not be modifiable in all implementations."; } leaf description { type string; description "Description of the logical network element."; } container root { description "Container for mount point."; yangmnt:mount-point "root" { description "Root for models supported per logical network element. This mount point may or may not be inline based on the server implementation. It SHALL always contain a YANG library and interfaces instance. When the associated 'managed' leaf is 'false', any operation that attempts to access information below the root SHALL fail with an error-tag of 'access-denied' and an error-app-tag of 'lne-not-managed'."; } } } } // augment statements augment "/if:interfaces/if:interface" { description "Add a node for the identification of the logical networkBerger, et al. Standards Track [Page 12]
RFC 8530 YANG LNEs March 2019 element associated with an interface. Applies to interfaces that can be assigned per logical network element. Note that a standard error will be returned if the identified leafref isn't present. If an interface cannot be assigned for any other reason, the operation SHALL fail with an error-tag of 'operation-failed' and an error-app-tag of 'lne-assignment-failed'. A meaningful error-info that indicates the source of the assignment failure SHOULD also be provided."; leaf bind-lne-name { type leafref { path "/logical-network-elements/logical-network-element/name"; } description "Logical network element ID to which the interface is bound."; } } // notification statements notification bind-lne-name-failed { description "Indicates an error in the association of an interface to an LNE. Only generated after success is initially returned when bind-lne-name is set."; leaf name { type leafref { path "/if:interfaces/if:interface/if:name"; } mandatory true; description "Contains the interface name associated with the failure."; } leaf bind-lne-name { type leafref { path "/if:interfaces/if:interface/lne:bind-lne-name"; } mandatory true; description "Contains the bind-lne-name associated with the failure."; } leaf error-info { type string;Berger, et al. Standards Track [Page 13]
RFC 8530 YANG LNEs March 2019 description "Optionally, indicates the source of the assignment failure."; } } } <CODE ENDS>7. References7.1. 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, <https://www.rfc-editor.org/info/rfc2119>. [RFC3688] Mealling, M., "The IETF XML Registry",BCP 81,RFC 3688, DOI 10.17487/RFC3688, January 2004, <https://www.rfc-editor.org/info/rfc3688>. [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)",RFC 6020, DOI 10.17487/RFC6020, October 2010, <https://www.rfc-editor.org/info/rfc6020>. [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, <https://www.rfc-editor.org/info/rfc6241>. [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)",RFC 6242, DOI 10.17487/RFC6242, June 2011, <https://www.rfc-editor.org/info/rfc6242>. [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol",RFC 8040, DOI 10.17487/RFC8040, January 2017, <https://www.rfc-editor.org/info/rfc8040>. [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase inRFC2119 Key Words",BCP 14,RFC 8174, DOI 10.17487/RFC8174, May 2017, <https://www.rfc-editor.org/info/rfc8174>. [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91,RFC 8341, DOI 10.17487/RFC8341, March 2018, <https://www.rfc-editor.org/info/rfc8341>.Berger, et al. Standards Track [Page 14]
RFC 8530 YANG LNEs March 2019 [RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)",RFC 8342, DOI 10.17487/RFC8342, March 2018, <https://www.rfc-editor.org/info/rfc8342>. [RFC8343] Bjorklund, M., "A YANG Data Model for Interface Management",RFC 8343, DOI 10.17487/RFC8343, March 2018, <https://www.rfc-editor.org/info/rfc8343>. [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3",RFC 8446, DOI 10.17487/RFC8446, August 2018, <https://www.rfc-editor.org/info/rfc8446>. [RFC8528] Bjorklund, M. and L. Lhotka, "YANG Schema Mount",RFC 8528, DOI 10.17487/RFC8528, March 2019, <https://www.rfc-editor.org/info/rfc8528>.7.2. Informative References [DEVICE-MODEL] Lindem, A., Berger, L., Bogdanovic, D., and C. Hopps, "Network Device YANG Logical Organization", Work in Progress,draft-ietf-rtgwg-device-model-02, March 2017. [OSPF-YANG] Yeung, D., Qu, Y., Zhang, Z., Chen, I., and A. Lindem, "YANG Data Model for OSPF Protocol", Work in Progress,draft-ietf-ospf-yang-21, January 2019. [RFC7317] Bierman, A. and M. Bjorklund, "A YANG Data Model for System Management",RFC 7317, DOI 10.17487/RFC7317, August 2014, <https://www.rfc-editor.org/info/rfc7317>. [RFC7895] Bierman, A., Bjorklund, M., and K. Watsen, "YANG Module Library",RFC 7895, DOI 10.17487/RFC7895, June 2016, <https://www.rfc-editor.org/info/rfc7895>. [RFC7950] Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",RFC 7950, DOI 10.17487/RFC7950, August 2016, <https://www.rfc-editor.org/info/rfc7950>. [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",BCP 215,RFC 8340, DOI 10.17487/RFC8340, March 2018, <https://www.rfc-editor.org/info/rfc8340>.Berger, et al. Standards Track [Page 15]
RFC 8530 YANG LNEs March 2019 [RFC8348] Bierman, A., Bjorklund, M., Dong, J., and D. Romascanu, "A YANG Data Model for Hardware Management",RFC 8348, DOI 10.17487/RFC8348, March 2018, <https://www.rfc-editor.org/info/rfc8348>. [RFC8349] Lhotka, L., Lindem, A., and Y. Qu, "A YANG Data Model for Routing Management (NMDA Version)",RFC 8349, DOI 10.17487/RFC8349, March 2018, <https://www.rfc-editor.org/info/rfc8349>. [RFC8529] Berger, L., Hopps, C., Lindem, A., Bogdanovic, D., and X. Liu, "YANG Data Model for Network Instances",RFC 8529, DOI 10.17487/RFC8529, March 2019, <https://www.rfc-editor.org/info/rfc8529>.Berger, et al. Standards Track [Page 16]
RFC 8530 YANG LNEs March 2019Appendix A. Examples The following subsections provide example uses of LNEs.A.1. Example: Host-Device-Managed LNE This section describes an example of the LNE model using schema mount to achieve the parent management. An example device supports multiple instances of LNEs (logical routers), each of which supports features of Layer 2 and Layer 3 interfaces [RFC8343], a routing information base [RFC8349], and the OSPF protocol [OSPF-YANG]. Each of these features is specified by a YANG model, and they are combined using the YANG schema mount as shown below. Not all possible mounted modules are shown. For example, implementations could also mount the model defined in [RFC8348].Berger, et al. Standards Track [Page 17]
RFC 8530 YANG LNEs March 2019 module: ietf-logical-network-element +--rw logical-network-elements +--rw logical-network-element* [name] +--rw name string +--mp root +--ro yanglib:modules-state/ | +--ro module-set-id string | +--ro module* [name revision] | +--ro name yang:yang-identifier +--rw sys:system/ | +--rw contact? string | +--rw hostname? inet:domain-name | +--rw authentication {authentication}? | +--rw user-authentication-order* identityref | +--rw user* [name] {local-users}? | +--rw name string | +--rw password? ianach:crypt-hash | +--rw authorized-key* [name] | +--rw name string | +--rw algorithm string | +--rw key-data binary +--ro sys:system-state/ | ... +--rw rt:routing/ | +--rw router-id? yang:dotted-quad | +--rw control-plane-protocols | +--rw control-plane-protocol* [type name] | +--rw ospf:ospf/ | +--rw areas | +--rw area* [area-id] | +--rw interfaces | +--rw interface* [name] | +--rw name if:interface-ref | +--rw cost? uint16 +--rw if:interfaces/ +--rw interface* [name] +--rw name string +--rw ip:ipv4!/ | +--rw address* [ip] | ...Berger, et al. Standards Track [Page 18]
RFC 8530 YANG LNEs March 2019 module: ietf-interfaces +--rw interfaces +--rw interface* [name] +--rw name string +--rw lne:bind-lne-name? string +--ro oper-status enumeration module: ietf-yang-library +--ro modules-state +--ro module-set-id string +--ro module* [name revision] +--ro name yang:yang-identifier module: ietf-system +--rw system | +--rw contact? string | +--rw hostname? inet:domain-name | +--rw authentication {authentication}? | +--rw user-authentication-order* identityref | +--rw user* [name] {local-users}? | +--rw name string | +--rw password? ianach:crypt-hash | +--rw authorized-key* [name] | +--rw name string | +--rw algorithm string | +--rw key-data binary +--ro system-state +--ro platform | +--ro os-name? string | +--ro os-release? string To realize the above schema, the example device implements the following schema mount instance: "ietf-yang-schema-mount:schema-mounts": { "mount-point": [ { "module": "ietf-logical-network-element", "label": "root", "shared-schema": {} } ] }Berger, et al. Standards Track [Page 19]
RFC 8530 YANG LNEs March 2019 By using the implementation of the YANG schema mount, an operator can create instances of logical routers. An interface can be assigned to a logical router, so that the logical router has the permission to access this interface. The OSPF protocol can then be enabled on this assigned interface. For this implementation, a parent management session has access to the schemas of both the parent hosting system and the child logical routers. In addition, each child logical router can grant its own management sessions, which have the following schema: module: ietf-yang-library +--ro modules-state +--ro module-set-id string +--ro module* [name revision] +--ro name yang:yang-identifier module: ietf-system +--rw system | +--rw contact? string | +--rw hostname? inet:domain-name | +--rw authentication {authentication}? | +--rw user-authentication-order* identityref | +--rw user* [name] {local-users}? | +--rw name string | +--rw password? ianach:crypt-hash | +--rw authorized-key* [name] | +--rw name string | +--rw algorithm string | +--rw key-data binary +--ro system-state +--ro platform +--ro os-name? string +--ro os-release? string module: ietf-routing rw-- routing +--rw router-id? yang:dotted-quad +--rw control-plane-protocols +--rw control-plane-protocol* [type name] +--rw ospf:ospf/ +--rw areas +--rw area* [area-id] +--rw interfaces +--rw interface* [name] +--rw name if:interface-ref +--rw cost? uint16Berger, et al. Standards Track [Page 20]
RFC 8530 YANG LNEs March 2019 module: ietf-interfaces +--rw interfaces +--rw interface* [name] +--rw name string +--ro oper-status enumerationA.1.1. Configuration Data The following shows an example where two customer-specific LNEs are configured: { "ietf-logical-network-element:logical-network-elements": { "logical-network-element": [ { "name": "cust1", "root": { "ietf-system:system": { "authentication": { "user": [ { "name": "john", "password": "$0$password" } ] } }, "ietf-routing:routing": { "router-id": "192.0.2.1", "control-plane-protocols": { "control-plane-protocol": [ { "type": "ietf-routing:ospf", "name": "1", "ietf-ospf:ospf": { "af": "ipv4", "areas": { "area": [ { "area-id": "203.0.113.1", "interfaces": { "interface": [ { "name": "eth1", "cost": 10 } ] }Berger, et al. Standards Track [Page 21]
RFC 8530 YANG LNEs March 2019 } ] } } } ] } }, "ietf-interfaces:interfaces": { "interface": [ { "name": "eth1", "type": "iana-if-type:ethernetCsmacd", "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.11", "prefix-length": 24 } ] }, "ietf-ip:ipv6": { "address": [ { "ip": "2001:db8:0:2::11", "prefix-length": 64 } ] } } ] } } }, { "name": "cust2", "root": { "ietf-system:system": { "authentication": { "user": [ { "name": "john", "password": "$0$password" } ] } }, "ietf-routing:routing": {Berger, et al. Standards Track [Page 22]
RFC 8530 YANG LNEs March 2019 "router-id": "192.0.2.2", "control-plane-protocols": { "control-plane-protocol": [ { "type": "ietf-routing:ospf", "name": "1", "ietf-ospf:ospf": { "af": "ipv4", "areas": { "area": [ { "area-id": "203.0.113.1", "interfaces": { "interface": [ { "name": "eth1", "cost": 10 } ] } } ] } } } ] } }, "ietf-interfaces:interfaces": { "interface": [ { "name": "eth1", "type": "iana-if-type:ethernetCsmacd", "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.11", "prefix-length": 24 } ] } } ] } } } ] },Berger, et al. Standards Track [Page 23]
RFC 8530 YANG LNEs March 2019 "ietf-interfaces:interfaces": { "interface": [ { "name": "eth0", "type": "iana-if-type:ethernetCsmacd", "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.10", "prefix-length": 24 } ] }, "ietf-ip:ipv6": { "address": [ { "ip": "2001:db8:0:2::10", "prefix-length": 64 } ] } }, { "name": "cust1:eth1", "type": "iana-if-type:ethernetCsmacd", "ietf-logical-network-element:bind-lne-name": "cust1" }, { "name": "cust2:eth1", "type": "iana-if-type:ethernetCsmacd", "ietf-logical-network-element:bind-lne-name": "cust2" } ] }, "ietf-system:system": { "authentication": { "user": [ { "name": "root", "password": "$0$password" } ] } } }Berger, et al. Standards Track [Page 24]
RFC 8530 YANG LNEs March 2019A.1.2. State Data The following shows possible state data associated with the above configuration data:{ "ietf-logical-network-element:logical-network-elements": { "logical-network-element": [ { "name": "cust1", "root": { "ietf-yang-library:modules-state": { "module-set-id": "123e4567-e89b-12d3-a456-426655440000", "module": [ { "name": "iana-if-type", "revision": "2014-05-08", "namespace": "urn:ietf:params:xml:ns:yang:iana-if-type", "conformance-type": "import" }, { "name": "ietf-inet-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-inet-types", "conformance-type": "import" }, { "name": "ietf-interfaces", "revision": "2014-05-08", "feature": [ "arbitrary-names", "pre-provisioning" ], "namespace": "urn:ietf:params:xml:ns:yang:ietf-interfaces", "conformance-type": "implement" }, { "name": "ietf-ip", "revision": "2014-06-16", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ip", "conformance-type": "implement" }, { "name": "ietf-ospf", "revision": "2018-03-03", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ospf",Berger, et al. Standards Track [Page 25]
RFC 8530 YANG LNEs March 2019 "conformance-type": "implement" }, { "name": "ietf-routing", "revision": "2018-03-13", "namespace": "urn:ietf:params:xml:ns:yang:ietf-routing", "conformance-type": "implement" }, { "name": "ietf-system", "revision": "2014-08-06", "namespace": "urn:ietf:params:xml:ns:yang:ietf-system", "conformance-type": "implement" }, { "name": "ietf-yang-library", "revision": "2016-06-21", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-library", "conformance-type": "implement" }, { "name": "ietf-yang-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-types", "conformance-type": "import" } ] }, "ietf-system:system-state": { "platform": { "os-name": "NetworkOS" } }, "ietf-routing:routing": { "router-id": "192.0.2.1", "control-plane-protocols": { "control-plane-protocol": [ { "type": "ietf-routing:ospf", "name": "1", "ietf-ospf:ospf": { "af": "ipv4", "areas": { "area": [ { "area-id": "203.0.113.1",Berger, et al. Standards Track [Page 26]
RFC 8530 YANG LNEs March 2019 "interfaces": { "interface": [ { "name": "eth1", "cost": 10 } ] } } ] } } } ] } }, "ietf-interfaces:interfaces": { "interface": [ { "name": "eth1", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C1", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.11", "prefix-length": 24 } ] }, "ietf-ip:ipv6": { "address": [ { "ip": "2001:db8:0:2::11", "prefix-length": 64 } ] } } ] } } }, {Berger, et al. Standards Track [Page 27]
RFC 8530 YANG LNEs March 2019 "name": "cust2", "root": { "ietf-yang-library:modules-state": { "module-set-id": "123e4567-e89b-12d3-a456-426655440000", "module": [ { "name": "iana-if-type", "revision": "2014-05-08", "namespace": "urn:ietf:params:xml:ns:yang:iana-if-type", "conformance-type": "import" }, { "name": "ietf-inet-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-inet-types", "conformance-type": "import" }, { "name": "ietf-interfaces", "revision": "2014-05-08", "feature": [ "arbitrary-names", "pre-provisioning" ], "namespace": "urn:ietf:params:xml:ns:yang:ietf-interfaces", "conformance-type": "implement" }, { "name": "ietf-ip", "revision": "2014-06-16", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ip", "conformance-type": "implement" }, { "name": "ietf-ospf", "revision": "2018-03-03", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ospf", "conformance-type": "implement" }, { "name": "ietf-routing", "revision": "2018-03-13", "namespace": "urn:ietf:params:xml:ns:yang:ietf-routing", "conformance-type": "implement" }, {Berger, et al. Standards Track [Page 28]
RFC 8530 YANG LNEs March 2019 "name": "ietf-system", "revision": "2014-08-06", "namespace": "urn:ietf:params:xml:ns:yang:ietf-system", "conformance-type": "implement" }, { "name": "ietf-yang-library", "revision": "2016-06-21", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-library", "conformance-type": "implement" }, { "name": "ietf-yang-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-types", "conformance-type": "import" } ] }, "ietf-system:system-state": { "platform": { "os-name": "NetworkOS" } }, "ietf-routing:routing": { "router-id": "192.0.2.2", "control-plane-protocols": { "control-plane-protocol": [ { "type": "ietf-routing:ospf", "name": "1", "ietf-ospf:ospf": { "af": "ipv4", "areas": { "area": [ { "area-id": "203.0.113.1", "interfaces": { "interface": [ { "name": "eth1", "cost": 10 } ] } }Berger, et al. Standards Track [Page 29]
RFC 8530 YANG LNEs March 2019 ] } } } ] } }, "ietf-interfaces:interfaces": { "interface": [ { "name": "eth1", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C2", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.11", "prefix-length": 24 } ] } } ] } } } ] }, "ietf-interfaces:interfaces": { "interface": [ { "name": "eth0", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C0", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.10", "prefix-length": 24Berger, et al. Standards Track [Page 30]
RFC 8530 YANG LNEs March 2019 } ] }, "ietf-ip:ipv6": { "address": [ { "ip": "2001:db8:0:2::10", "prefix-length": 64 } ] } }, { "name": "cust1:eth1", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C1", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-logical-network-element:bind-lne-name": "cust1" }, { "name": "cust2:eth1", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C2", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-logical-network-element:bind-lne-name": "cust2" } ] }, "ietf-system:system-state": { "platform": { "os-name": "NetworkOS" } }, "ietf-yang-library:modules-state": { "module-set-id": "123e4567-e89b-12d3-a456-426655440000", "module": [ { "name": "iana-if-type", "revision": "2014-05-08", "namespace": "urn:ietf:params:xml:ns:yang:iana-if-type",Berger, et al. Standards Track [Page 31]
RFC 8530 YANG LNEs March 2019 "conformance-type": "import" }, { "name": "ietf-inet-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-inet-types", "conformance-type": "import" }, { "name": "ietf-interfaces", "revision": "2014-05-08", "feature": [ "arbitrary-names", "pre-provisioning" ], "namespace": "urn:ietf:params:xml:ns:yang:ietf-interfaces", "conformance-type": "implement" }, { "name": "ietf-ip", "revision": "2014-06-16", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ip", "conformance-type": "implement" }, { "name": "ietf-logical-network-element", "revision": "2017-03-13", "feature": [ "bind-lne-name" ], "namespace": "urn:ietf:params:xml:ns:yang:ietf-logical-network-element", "conformance-type": "implement" }, { "name": "ietf-ospf", "revision": "2018-03-03", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ospf", "conformance-type": "implement" }, { "name": "ietf-routing", "revision": "2018-03-13", "namespace": "urn:ietf:params:xml:ns:yang:ietf-routing", "conformance-type": "implement" }, { "name": "ietf-system",Berger, et al. Standards Track [Page 32]
RFC 8530 YANG LNEs March 2019 "revision": "2014-08-06", "namespace": "urn:ietf:params:xml:ns:yang:ietf-system", "conformance-type": "implement" }, { "name": "ietf-yang-library", "revision": "2016-06-21", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-library", "conformance-type": "implement" }, { "name": "ietf-yang-schema-mount", "revision": "2017-05-16", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-schema-mount", "conformance-type": "implement" }, { "name": "ietf-yang-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-types", "conformance-type": "import" } ] }, "ietf-yang-schema-mount:schema-mounts": { "mount-point": [ { "module": "ietf-logical-network-element", "label": "root", "shared-schema": {} } ] }}A.2. Example: Self-Managed LNE This section describes an example of the LNE model using schema mount to achieve child-independent management. An example device supports multiple instances of LNEs (logical routers), each of which has the features of Layer 2 and Layer 3 interfaces [RFC8343], a routing information base [RFC8349], and the OSPF protocol. Each of these features is specified by a YANG model, and they are put together by the YANG schema mount as follows:Berger, et al. Standards Track [Page 33]
RFC 8530 YANG LNEs March 2019 module: ietf-logical-network-element +--rw logical-network-elements +--rw logical-network-element* [name] +--rw name string +--mp root // The internal modules of the LNE are not visible to // the parent management. // The child manages its modules, including ietf-routing // and ietf-interfaces module: ietf-interfaces +--rw interfaces +--rw interface* [name] +--rw name string +--rw lne:bind-lne-name? string +--ro oper-status enumeration module: ietf-yang-library +--ro modules-state +--ro module-set-id string +--ro module* [name revision] +--ro name yang:yang-identifier module: ietf-system +--rw system | +--rw contact? string | +--rw hostname? inet:domain-name | +--rw authentication {authentication}? | +--rw user-authentication-order* identityref | +--rw user* [name] {local-users}? | +--rw name string | +--rw password? ianach:crypt-hash | +--rw authorized-key* [name] | +--rw name string | +--rw algorithm string | +--rw key-data binary +--ro system-state +--ro platform | +--ro os-name? string | +--ro os-release? stringBerger, et al. Standards Track [Page 34]
RFC 8530 YANG LNEs March 2019 To realize the above schema, the device implements the following schema mount instance: "ietf-yang-schema-mount:schema-mounts": { "mount-point": [ { "module": "ietf-logical-network-element", "label": "root", "inline": {} } ] } By using the implementation of the YANG schema mount, an operator can create instances of logical routers, each with their logical router- specific inline modules. An interface can be assigned to a logical router, so that the logical router has the permission to access this interface. The OSPF protocol can then be enabled on this assigned interface. Each logical router independently manages its own set of modules, which may or may not be the same as other logical routers. The following is an example of schema set implemented on one particular logical router:Berger, et al. Standards Track [Page 35]
RFC 8530 YANG LNEs March 2019 module: ietf-yang-library +--ro modules-state +--ro module-set-id string +--ro module* [name revision] +--ro name yang:yang-identifier module: ietf-system +--rw system | +--rw contact? string | +--rw hostname? inet:domain-name | +--rw authentication {authentication}? | +--rw user-authentication-order* identityref | +--rw user* [name] {local-users}? | +--rw name string | +--rw password? ianach:crypt-hash | +--rw authorized-key* [name] | +--rw name string | +--rw algorithm string | +--rw key-data binary +--ro system-state +--ro platform | +--ro os-name? string | +--ro os-release? string module: ietf-routing +--rw routing +--rw router-id? yang:dotted-quad +--rw control-plane-protocols +--rw control-plane-protocol* [type name] +--rw ospf:ospf/ +--rw areas +--rw area* [area-id] +--rw interfaces +--rw interface* [name] +--rw name if:interface-ref +--rw cost? uint16 module: ietf-interfaces +--rw interfaces +--rw interface* [name] +--rw name string +--ro oper-status enumerationA.2.1. Configuration Data Each of the child virtual routers is managed through its own sessions and configuration data.Berger, et al. Standards Track [Page 36]
RFC 8530 YANG LNEs March 2019A.2.1.1. Logical Network Element 'vnf1' The following shows an example of configuration data for the LNE name "vnf1": { "ietf-system:system": { "authentication": { "user": [ { "name": "john", "password": "$0$password" } ] } }, "ietf-routing:routing": { "router-id": "192.0.2.1", "control-plane-protocols": { "control-plane-protocol": [ { "type": "ietf-routing:ospf", "name": "1", "ietf-ospf:ospf": { "af": "ipv4", "areas": { "area": [ { "area-id": "203.0.113.1", "interfaces": { "interface": [ { "name": "eth1", "cost": 10 } ] } } ] } } } ] } }, "ietf-interfaces:interfaces": { "interface": [ {Berger, et al. Standards Track [Page 37]
RFC 8530 YANG LNEs March 2019 "name": "eth1", "type": "iana-if-type:ethernetCsmacd", "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.11", "prefix-length": 24 } ] } } ] } }A.2.1.2. Logical Network Element 'vnf2' The following shows an example of configuration data for the LNE name "vnf2": { "ietf-system:system": { "authentication": { "user": [ { "name": "john", "password": "$0$password" } ] } }, "ietf-routing:routing": { "router-id": "192.0.2.2", "control-plane-protocols": { "control-plane-protocol": [ { "type": "ietf-routing:ospf", "name": "1", "ietf-ospf:ospf": { "af": "ipv4", "areas": { "area": [ { "area-id": "203.0.113.1", "interfaces": { "interface": [ { "name": "eth1",Berger, et al. Standards Track [Page 38]
RFC 8530 YANG LNEs March 2019 "cost": 10 } ] } } ] } } } ] } }, "ietf-interfaces:interfaces": { "interface": [ { "name": "eth1", "type": "iana-if-type:ethernetCsmacd", "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.11", "prefix-length": 24 } ] } } ] } }A.2.2. State Data The following sections show possible state data associated with the above configuration data. Note that there are three views: the host device's view and each of the LNE's views.A.2.2.1. Host Device The following shows state data for the device hosting the example LNEs: { "ietf-logical-network-element:logical-network-elements": { "logical-network-element": [ { "name": "vnf1", "root": { }Berger, et al. Standards Track [Page 39]
RFC 8530 YANG LNEs March 2019 }, { "name": "vnf2", "root": { } } ] }, "ietf-interfaces:interfaces": { "interface": [ { "name": "eth0", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C0", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.10", "prefix-length": 24 } ] } }, { "name": "vnf1:eth1", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C1", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-logical-network-element:bind-lne-name": "vnf1" }, { "name": "vnf2:eth2", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C2", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-logical-network-element:bind-lne-name": "vnf2" }Berger, et al. Standards Track [Page 40]
RFC 8530 YANG LNEs March 2019 ] }, "ietf-system:system-state": { "platform": { "os-name": "NetworkOS" } }, "ietf-yang-library:modules-state": { "module-set-id": "123e4567-e89b-12d3-a456-426655440000", "module": [ { "name": "iana-if-type", "revision": "2014-05-08", "namespace": "urn:ietf:params:xml:ns:yang:iana-if-type", "conformance-type": "import" }, { "name": "ietf-inet-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-inet-types", "conformance-type": "import" }, { "name": "ietf-interfaces", "revision": "2014-05-08", "feature": [ "arbitrary-names", "pre-provisioning" ], "namespace": "urn:ietf:params:xml:ns:yang:ietf-interfaces", "conformance-type": "implement" }, { "name": "ietf-ip", "revision": "2014-06-16", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ip", "conformance-type": "implement" }, { "name": "ietf-logical-network-element", "revision": "2017-03-13", "feature": [ "bind-lne-name" ], "namespace": "urn:ietf:params:xml:ns:yang:ietf-logical-network-element",Berger, et al. Standards Track [Page 41]
RFC 8530 YANG LNEs March 2019 "conformance-type": "implement" }, { "name": "ietf-system", "revision": "2014-08-06", "namespace": "urn:ietf:params:xml:ns:yang:ietf-system", "conformance-type": "implement" }, { "name": "ietf-yang-library", "revision": "2016-06-21", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-library", "conformance-type": "implement" }, { "name": "ietf-yang-schema-mount", "revision": "2017-05-16", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-schema-mount", "conformance-type": "implement" }, { "name": "ietf-yang-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-types", "conformance-type": "import" } ] }, "ietf-yang-schema-mount:schema-mounts": { "mount-point": [ { "module": "ietf-logical-network-element", "label": "root", "inline": {} } ] } }Berger, et al. Standards Track [Page 42]
RFC 8530 YANG LNEs March 2019A.2.2.2. Logical Network Element 'vnf1' The following shows state data for the example LNE with the name "vnf1": { "ietf-yang-library:modules-state": { "module-set-id": "123e4567-e89b-12d3-a456-426655440000", "module": [ { "name": "iana-if-type", "revision": "2014-05-08", "namespace": "urn:ietf:params:xml:ns:yang:iana-if-type", "conformance-type": "import" }, { "name": "ietf-inet-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-inet-types", "conformance-type": "import" }, { "name": "ietf-interfaces", "revision": "2014-05-08", "feature": [ "arbitrary-names", "pre-provisioning" ], "namespace": "urn:ietf:params:xml:ns:yang:ietf-interfaces", "conformance-type": "implement" }, { "name": "ietf-ip", "revision": "2014-06-16", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ip", "conformance-type": "implement" }, { "name": "ietf-ospf", "revision": "2018-03-03", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ospf", "conformance-type": "implement" }, { "name": "ietf-routing", "revision": "2018-03-13", "namespace": "urn:ietf:params:xml:ns:yang:ietf-routing", "conformance-type": "implement"Berger, et al. Standards Track [Page 43]
RFC 8530 YANG LNEs March 2019 }, { "name": "ietf-system", "revision": "2014-08-06", "namespace": "urn:ietf:params:xml:ns:yang:ietf-system", "conformance-type": "implement" }, { "name": "ietf-yang-library", "revision": "2016-06-21", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-library", "conformance-type": "implement" }, { "name": "ietf-yang-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-types", "conformance-type": "import" } ] }, "ietf-system:system-state": { "platform": { "os-name": "NetworkOS" } }, "ietf-routing:routing": { "router-id": "192.0.2.1", "control-plane-protocols": { "control-plane-protocol": [ { "type": "ietf-routing:ospf", "name": "1", "ietf-ospf:ospf": { "af": "ipv4", "areas": { "area": [ { "area-id": "203.0.113.1", "interfaces": { "interface": [ { "name": "eth1", "cost": 10 } ]Berger, et al. Standards Track [Page 44]
RFC 8530 YANG LNEs March 2019 } } ] } } } ] } }, "ietf-interfaces:interfaces": { "interface": [ { "name": "eth1", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C1", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.11", "prefix-length": 24 } ] } } ] } }A.2.2.3. Logical Network Element 'vnf2' The following shows state data for the example LNE with the name "vnf2": { "ietf-yang-library:modules-state": { "module-set-id": "123e4567-e89b-12d3-a456-426655440000", "module": [ { "name": "iana-if-type", "revision": "2014-05-08", "namespace": "urn:ietf:params:xml:ns:yang:iana-if-type", "conformance-type": "import" },Berger, et al. Standards Track [Page 45]
RFC 8530 YANG LNEs March 2019 { "name": "ietf-inet-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-inet-types", "conformance-type": "import" }, { "name": "ietf-interfaces", "revision": "2014-05-08", "feature": [ "arbitrary-names", "pre-provisioning" ], "namespace": "urn:ietf:params:xml:ns:yang:ietf-interfaces", "conformance-type": "implement" }, { "name": "ietf-ip", "revision": "2014-06-16", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ip", "conformance-type": "implement" }, { "name": "ietf-ospf", "revision": "2018-03-03", "namespace": "urn:ietf:params:xml:ns:yang:ietf-ospf", "conformance-type": "implement" }, { "name": "ietf-routing", "revision": "2018-03-13", "namespace": "urn:ietf:params:xml:ns:yang:ietf-routing", "conformance-type": "implement" }, { "name": "ietf-system", "revision": "2014-08-06", "namespace": "urn:ietf:params:xml:ns:yang:ietf-system", "conformance-type": "implement" }, { "name": "ietf-yang-library", "revision": "2016-06-21", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-library", "conformance-type": "implement" },Berger, et al. Standards Track [Page 46]
RFC 8530 YANG LNEs March 2019 { "name": "ietf-yang-types", "revision": "2013-07-15", "namespace": "urn:ietf:params:xml:ns:yang:ietf-yang-types", "conformance-type": "import" } ] }, "ietf-system:system-state": { "platform": { "os-name": "NetworkOS" } }, "ietf-routing:routing": { "router-id": "192.0.2.2", "control-plane-protocols": { "control-plane-protocol": [ { "type": "ietf-routing:ospf", "name": "1", "ietf-ospf:ospf": { "af": "ipv4", "areas": { "area": [ { "area-id": "203.0.113.1", "interfaces": { "interface": [ { "name": "eth1", "cost": 10 } ] } } ] } } } ] } },Berger, et al. Standards Track [Page 47]
RFC 8530 YANG LNEs March 2019 "ietf-interfaces:interfaces": { "interface": [ { "name": "eth1", "type": "iana-if-type:ethernetCsmacd", "oper-status": "up", "phys-address": "00:01:02:A1:B1:C2", "statistics": { "discontinuity-time": "2017-06-26T12:34:56-05:00" }, "ietf-ip:ipv4": { "address": [ { "ip": "192.0.2.11", "prefix-length": 24 } ] } } ] } }Berger, et al. Standards Track [Page 48]
RFC 8530 YANG LNEs March 2019Acknowledgments The Routing Area Yang Architecture design team members included Acee Lindem, Anees Shaikh, Christian Hopps, Dean Bogdanovic, Lou Berger, Qin Wu, Rob Shakir, Stephane Litkowski, and Yan Gang. Useful review comments were also received by Martin Bjorklund, John Scudder, Dan Romascanu, and Taylor Yu. This document was motivated by, and derived from "Network Device YANG Logical Organization" [DEVICE-MODEL]. Thanks to Alvaro Retana for the IESG review.Authors' Addresses Lou Berger LabN Consulting, L.L.C. Email: lberger@labn.net Christian Hopps LabN Consulting, L.L.C. Email: chopps@chopps.org Acee Lindem Cisco Systems 301 Midenhall Way Cary, NC 27513 United States of America Email: acee@cisco.com Dean Bogdanovic Volta Networks Email: ivandean@gmail.com Xufeng Liu Volta Networks Email: xufeng.liu.ietf@gmail.comBerger, et al. Standards Track [Page 49]
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