| RFC 9731 | VN YANG Data Model | January 2025 |
| Lee, et al. | Standards Track | [Page] |
A Virtual Network (VN) is a network provided by a service provider to a customer for the customer to use in any way it wants as though it were a physical network. This document provides a YANG data model generally applicable to any mode of VN operations. This includes VN operations as per the Abstraction and Control of TE Networks (ACTN) framework.¶
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 in Section 2 of RFC 7841.¶
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at https://www.rfc-editor.org/info/rfc9731.¶
Copyright (c) 2025 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 (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 Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.¶
Abstraction and Control of TE Networks (ACTN) describes a set of management and control functions used to operate one or more Traffic Engineered (TE) networks to construct a Virtual Network (VN). A VN is represented to customers and is built from the abstractions of the underlying TE networks [RFC8453]. This document provides a YANG data model [RFC7950] generally applicable to any mode of VN operation. ACTN is the primary example of the usage of the VN YANG model, but VN is not limited to it.¶
The VN model defined in this document is applicable in a generic sense as an independent model in and of itself. It can also work together with other customer service models such as the L3VPN Service Model (L3SM) [RFC8299], the L2VPN Service Model (L2SM) [RFC8466], and the L1 Connectivity Service Model (L1CSM) [L1CSM-YANG] to provide complete life-cycle service management and operations.¶
The YANG model discussed in this document basically provides the following:¶
An abstract TE topology is a topology that contains abstract topological elements (nodes, links) created and customized based on customer preference [RFC8795]. The actual VN instantiation and computation is performed with Connectivity Matrices of the TE-Topology Model [RFC8795], which provides a TE network topology abstraction and management operation. As per [RFC8795], a TE node connectivity matrix is the TE node's switching limitations in the form of valid switching combinations of the TE node's LTPs and potential TE paths. The VN representation relies on a single abstract TE node with a connectivity matrix. The VN can be abstracted as a set of edge-to-edge links (a Type 1 VN). Each link is the VN member that is mapped to the connectivity matrix entry (Section 2.1). The VN can also be abstracted as a topology of virtual nodes and virtual links (a Type 2 VN). Alongside the mapping of VN members to a connectivity matrix entry, an underlay path can also be specified (Section 2.2).¶
Once the TE-topology Model is used in triggering VN instantiation over the networks, the TE-tunnel Model [YANG-TE] will inevitably interact with the TE-Topology model when setting up actual tunnels and Label Switched Paths (LSPs) under the tunnels.¶
Sections 2 and 3 provide a discussion of how the VN YANG model is applicable to the ACTN context where a Virtual Network Service (VNS) operation is implemented for the interface of the Customer Network Controller (CNC) and the Multi-Domain Service Coordinator (MDSC).¶
The YANG model for the CNC-MDSC Interface (CMI) is also known as the "customer service model" in [RFC8309]. The YANG model discussed in this document is used to operate customer-driven VNs during the VN instantiation and computation as well as its life-cycle service management and operations.¶
The VN operational state is included in the same tree as the configuration consistent with Network Management Datastore Architecture (NMDA) [RFC8342].¶
This document borrows the following terms from [RFC8453]:¶
This document borrows the following terms from [RFC8795]:¶
This document borrows the terminology in Section 1.1 of [RFC7926].¶
This document uses the term 'Service Model' as described in [RFC8309].¶
A simplified graphical representation of the data model is used in Section 5 of this document. The meaning of the symbols in these diagrams is defined in [RFC8340].¶
In this document, the names of data nodes and other data model objects are prefixed using the standard prefix associated with the corresponding YANG imported modules as shown in Table 1.¶
In this section, ACTN is being used to illustrate the general usage of the VN YANG model. The model presented in this section has the following ACTN context.¶
+-------+
| CNC |
+-------+
|
| VN YANG + TE-topology YANG
|
+-----------------------+
| MDSC |
+-----------------------+
Both ACTN VN YANG and TE-topology models are used over the CMI to establish a VN over TE networks, as shown in Figure 1.¶
As defined in [RFC8453], a Virtual Network is a customer view of the TE network. To recapitulate VN types from [RFC8453], a Type 1 VN is defined as follows:¶
The VN can be seen as a set of edge-to-edge abstract links (a Type 1 VN). Each abstract link is referred to as a VN member and is formed as an end-to-end tunnel across the underlying networks. Such tunnels may be constructed by recursive slicing or abstraction of paths in the underlying networks and can encompass edge points of the customer's network, access links, intra-domain paths, and inter-domain links.¶
If we were to create a VN where we have four VN-members as follows:¶
VN-member 1 L1-L4 VN-member 2 L1-L7 VN-member 3 L2-L4 VN-member 4 L3-L8
Where L1, L2, L3, L4, L7, and L8 correspond to a Customer Endpoint (or AP).¶
This VN can be modeled as one abstract node representation as follows in Figure 3:¶
+----------------------------------------------+
| |
L1----|..............................................|------L4
| . . |
| . AN1 . |
| . . |
| ..................................*.....|------L7
| . |
L2-----|....................................... |
| |
L3-----|..............................................|------L8
| |
+----------------------------------------------+
Modeling a VN as one abstract node is the easiest way for customers to express their end-to-end connectivity as shown in Figure 3.¶
For some VN members, the customers are allowed to configure the intended path. To achieve this, alongside the single node abstract topology, an underlay topology is also needed. The underlay topology could be native TE topology or an abstract TE topology. The intended path is set based on the nodes and links of the underlay topology. A Type 1 VN can be seen as a higher abstraction of a Type 2 VN (which along with a single node abstract topology, an underlay topology and the intended path are specified). These topologies could be mutually agreed upon between the CNC and the MDSC prior to VN creation or they could be created as part of VN instantiation.¶
If a Type 2 VN is desired for some or all of the VN members of a Type 1 VN (see the example in Section 2.1), the TE-topology model can provide the following abstract topologies (a single node topology AN1 and an underlay topology (with nodes S1 to S11 and corresponding links)).¶
+----------------------------------------------+
| S1 S2 |
| O...............O |
| ......... ....... . |
| . . . |
|S3 . . S4 . S5 |
L1----|.O......................O.........O...........|------L4
| . . . |
| . . . |
| . S6 . S7 . S8 |
| O ................O.........O.......|------L7
| . . . . ..... |
|S9 . . .S10 . . |
L2-----|...O.....O.....................O..............|------L8
| . S11 |
L3-----|.. |
| AN1 |
+----------------------------------------------+
As shown in Figure 4, the abstract node is AN1 and an underlay topology is depicted with nodes and links (S1 to S11).¶
As an example, if VN-member 1 (L1-L4) is chosen to configure its own path over Type 2 topology, it can select, say, a path that consists of the explicit abstract path {S3,S4,S5} based on the underlay topology and its service requirement. This capability is enacted via TE-topology configuration by the customer.¶
If this VN is Type 1, the following diagram shows the message flow between CNC and MDSC to instantiate this VN using VN and TE-Topology Models.¶
+--------+ +--------+
| CNC | | MDSC |
+--------+ +--------+
| |
| |
CNC POST TE-topo | POST /nw:networks/nw:network/ |
model (with Conn.| nw:node/te-node-id/ |
Matrix on one | tet:connectivity-matrices/ |
Abstract node) | tet:connectivity-matrix |
|-------------------------------->|
| HTTP 200 |
|<--------------------------------|
| |
CNC POST the | POST /virtual-network |
VN identifying |-------------------------------->| If there is
AP, VNAP, and VN-| | multi-src/dest,
Members and maps | | then MDSC
to the TE-topo | HTTP 200 | selects an
|<--------------------------------| src or dest
| | and updates
| | VN YANG
CNC GET the | GET /virtual-network |
VN YANG status |-------------------------------->|
| |
| HTTP 200 (VN with status: |
| selected VN-members |
| in case of multi-s-d) |
|<--------------------------------|
| |
For some VN members, the customer may want to "configure" an explicit path that connects its two endpoints. Let us consider the following example:¶
VN-member 1 L1-L4 (via S3, S4, and S5) VN-member 2 L1-L7 (via S3, S4, S7, and S8) VN-member 3 L2-L7 (via S9, S10, and S11) VN-member 4 L3-L8 (via S9, S10, and S11)
There are two options depending on whether CNC or MDSC creates the single abstract node topology.¶
Case 1:¶
If the CNC creates the single-abstract-node topology, the message flow between the CNC and MDSC to instantiate this VN using a VN and TE-Topology Model would be as shown in the following diagram:¶
+--------+ +--------+
| CNC | | MDSC |
+--------+ +--------+
| |
| |
CNC POST TE-topo | POST /nw:networks/nw:network/ |
model (with Conn.| nw:node/te-node-id/tet:connectivity- |
Matrix on one | matrices/tet:connectivity-matrix |
Abstract node and|---------------------------------------->|
explicit paths in| |
the Conn. Matrix)| HTTP 200 |
|<----------------------------------------|
| |
CNC POST the | POST /virtual-network |
VN identifying |---------------------------------------->|
AP, VNAP, and VN-| |
Members and maps | |
to the TE-topo | HTTP 200 |
|<----------------------------------------|
| |
| |
CNC GET the | GET /virtual-network |
VN YANG status |---------------------------------------->|
| |
| HTTP 200 (VN with status) |
|<----------------------------------------|
| |
Case 2:¶
On the other hand, if MDSC create the single-abstract-node topology based on VN YANG posted by the CNC, the following diagram shows the message flow between CNC and MDSC to instantiate this VN using VN and TE-Topology Models.¶
+--------+ +--------+
| CNC | | MDSC |
+--------+ +--------+
| |
| |
CNC POST VN | |
identifying AP, | |
VNAP and VN- | POST /virtual-network | MDSC populates
Members |-------------------------------->| a single Abst.
| HTTP 200 | node topology
|<--------------------------------| by itself
| |
CNC GET VN & | GET /virtual-network & |
POST TE-topo | POST /nw:networks/nw:network/ |
models (with | nw:node/te-node-id/tet: |
Conn. Matrix | connectivity-matrices/ |
on the | tet:connectivity-matrix |
Abstract node |-------------------------------->|
and explicit | |
paths in the | |
Conn. Matrix) | |
| HTTP 200 |
|<--------------------------------|
| |
| |
CNC GET the | GET /virtual-network |
VN YANG status |-------------------------------->|
| |
| HTTP 200 (VN with status) |
|<--------------------------------|
| |
Note that the underlay topology (which is referred to by the single-abstract-node topology) could be a Native/White topology or a Grey topology ([RFC8453]) that is further customized based on the requirements of the customer and configured at the MDSC.¶
Appendix B provides JSON examples for both the VN model and the TE-topology Connectivity Matrix sub-model to illustrate how a VN can be created by the CNC making use of the VN module as well as the TE-topology Connectivity Matrix module.¶
The customer access information may be known at the time of VN creation. A shared logical AP identifier is used between the customer and the operator to identify the access link between Customer Edge (CE) and Provider Edge (PE). This is described in Section 6 of [RFC8453].¶
In some VN operations, the customer access may not be known at the initial VN creation. The VN operation allows the creation of a VN with only a PE identifier as well. The customer access information could be added later.¶
To achieve this, the 'ap' container has a leaf for the 'pe' node that allows the AP to be created with PE information. The vn-member (and vn) could use APs that initially only have PE information.¶
The VN-YANG model allows the definition of a customer view and allows the customer to communicate using the VN constructs as described in [RFC8454]. It allows the grouping of edge-to-edge links (i.e., VN members) under a common umbrella of VN. This allows the customer to instantiate and view the VN as one entity, making it easier for some customers to work on VN without worrying about the details of the provider-based YANG models.¶
This is similar to the benefits offered by a separate YANG model for customer services described in [RFC8309], which states that service models do not make any assumptions about how a service is actually engineered and delivered for a customer.¶
The VN could be configured at the MDSC explicitly by the CNC using the VN YANG model. In some other cases, the VN is not explicitly configured but is instead created automatically by the MDSC based on the customer service model and local policy; even in these cases, the VN YANG model can be used by the CNC to learn details of the underlying VN, created to meet the requirements of the customer service model.¶
The VN Model supports VN compute (pre-instantiation mode) to view the full VN as a single entity before instantiation; achieving this via path computation or "compute only" tunnel setup ([YANG-TE]) does not provide the same functionality.¶
+--------+ +--------+
| CNC | | MDSC |
+--------+ +--------+
| |
| |
CNC POST TE-topo | POST /nw:networks/nw:network/ |
model(with Conn. | nw:node/te-node-id/tet:connectivity- |
Matrix on one | matrices/tet:connectivity-matrix |
Abstract node and|---------------------------------------->|
constraints in | |
the conn. matrix)| HTTP 200 |
|<----------------------------------------|
| |
| |
CNC calls RPC to | RPC /vn-compute |
compute the VN |---------------------------------------->|
as per the | |
refered TE-Topo | |
| |
| HTTP 200 (Computed VN) |
|<----------------------------------------|
| |
The VN compute RPC allows the optional inclusion of the constraints and the optimization criteria at the VN as well as at the individual VN-member level. Thus, the RPC can be used independently to get the computed VN result without creating an abstract topology first.¶
+--------+ +--------+
| CNC | | MDSC |
+--------+ +--------+
| |
| |
CNC calls RPC to | RPC /vn-compute |
compute the VN |---------------------------------------->|
as per the | |
constraints and | |
VN-members | |
| HTTP 200 (Computed VN) |
|<----------------------------------------|
| |
In either case, the output includes a reference to the single node abstract topology with each VN-member including a reference to the connectivity-matrix-id where the path properties could be found.¶
To achieve this, the VN-compute RPC reuses the following common groupings:¶
When MDSC receives this RPC, it computes the VN based on the input provided in the RPC. This computation does not create a VN or reserve any resources in the system, it simply computes the resulting VN based on information at the MDSC or in coordination with the CNC. A single-node-abstract topology is used to convey the result of each VN member as a reference to the connectivity-matrix-id. In case of an error, the error information is included.¶
rpcs:
+---x vn-compute
+---w input
| +---w te-topology-identifier
| | +---w provider-id? te-global-id
| | +---w client-id? te-global-id
| | +---w topology-id? te-topology-id
| +---w abstract-node?
| | -> /nw:networks/network/node/tet:te-node-id
| +---w path-constraints
| | +---w te-bandwidth
| | | +---w (technology)?
| | | ...
| | +---w link-protection? identityref
| | +---w setup-priority? uint8
| | +---w hold-priority? uint8
| | +---w signaling-type? identityref
| | +---w path-metric-bounds
| | | +---w path-metric-bound* [metric-type]
| | | ...
| | +---w path-affinities-values
| | | +---w path-affinities-value* [usage]
| | | ...
| | +---w path-affinity-names
| | | +---w path-affinity-name* [usage]
| | | ...
| | +---w path-srlgs-lists
| | | +---w path-srlgs-list* [usage]
| | | ...
| | +---w path-srlgs-names
| | | +---w path-srlgs-name* [usage]
| | | ...
| | +---w disjointness? te-path-disjointness
| +---w cos? te-types:te-ds-class
| +---w optimizations
| | +---w (algorithm)?
| | +--:(metric) {path-optimization-metric}?
| | | ...
| | +--:(objective-function)
| | {path-optimization-objective-function}?
| | ...
| +---w vn-member-list* [id]
| | +---w id vnm-id
| | +---w src
| | | +---w ap? -> /access-point/ap/id
| | | +---w vn-ap-id?
| | | | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| | | +---w multi-src? boolean {multi-src-dest}?
| | +---w dest
| | | +---w ap? -> /access-point/ap/id
| | | +---w vn-ap-id?
| | | | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| | | +---w multi-dest? boolean {multi-src-dest}?
| | +---w connectivity-matrix-id? leafref
| | +---w underlay
| | +---w path-constraints
| | | +---w te-bandwidth
| | | | ...
| | | +---w link-protection? identityref
| | | +---w setup-priority? uint8
| | | +---w hold-priority? uint8
| | | +---w signaling-type? identityref
| | | +---w path-metric-bounds
| | | | ...
| | | +---w path-affinities-values
| | | | ...
| | | +---w path-affinity-names
| | | | ...
| | | +---w path-srlgs-lists
| | | | ...
| | | +---w path-srlgs-names
| | | | ...
| | | +---w disjointness? te-path-disjointness
| | +---w cos? te-types:te-ds-class
| | +---w optimizations
| | +---w (algorithm)?
| | ...
| +---w vn-level-diversity? te-types:te-path-disjointness
+--ro output
+--ro te-topology-identifier
| +--ro provider-id? te-global-id
| +--ro client-id? te-global-id
| +--ro topology-id? te-topology-id
+--ro abstract-node?
| -> /nw:networks/network/node/tet:te-node-id
+--ro vn-member-list* [id]
+--ro id vnm-id
+--ro src
| +--ro ap? -> /access-point/ap/id
| +--ro vn-ap-id?
| | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| +--ro multi-src? boolean {multi-src-dest}?
+--ro dest
| +--ro ap? -> /access-point/ap/id
| +--ro vn-ap-id?
| | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| +--ro multi-dest? boolean {multi-src-dest}?
+--ro connectivity-matrix-id? leafref
+--ro underlay
+--ro if-selected? boolean {multi-src-dest}?
+--ro compute-status? vn-compute-status
+--ro error-info
+--ro error-description? string
+--ro error-timestamp? yang:date-and-time
+--ro error-reason? identityref¶
In creating a virtual network, the list of sources or destinations or both may not be predetermined by the customer. For instance, for a given source, there may be a list of multiple destinations to which the optimal destination may be chosen depending on the network resource situations. Likewise, for a given destination, there may also be multiple sources from which the optimal source may be chosen. In some cases, there may be a pool of multiple sources and destinations from which the optimal source-destination may be chosen. The following YANG tree shows how to model multiple sources and multiple destinations.¶
module: ietf-vn
+--rw virtual-network
+--rw vn* [id]
+--rw id vn-id
+--rw te-topology-identifier
| +--rw provider-id? te-global-id
| +--rw client-id? te-global-id
| +--rw topology-id? te-topology-id
+--rw abstract-node?
| -> /nw:networks/network/node/tet:te-node-id
+--rw vn-member* [id]
| +--rw id vnm-id
| +--rw src
| | +--rw ap? -> /access-point/ap/id
| | +--rw vn-ap-id?
| | | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| | +--rw multi-src? boolean {multi-src-dest}?
| +--rw dest
| | +--rw ap? -> /access-point/ap/id
| | +--rw vn-ap-id?
| | | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| | +--rw multi-dest? boolean {multi-src-dest}?
| +--rw connectivity-matrix-id? leafref
| +--rw underlay
| +--ro oper-status? te-types:te-oper-status
| +--ro if-selected? boolean {multi-src-dest}?
+--rw admin-status? te-types:te-admin-status
+--ro oper-status? te-types:te-oper-status
+--rw vn-level-diversity? te-types:te-path-disjointness¶
The VN YANG model can easily be augmented to support the mapping of VN to the services such as L3SM and L2SM as described in [TE-SERVICE-MAPPING].¶
The VN YANG model can be extended to support telemetry, performance monitoring, and network autonomics as described in [TEAS-ACTN-PM].¶
Note that the YANG model is tightly coupled with the TE Topology model [RFC8795]. Any underlay technology not supported by [RFC8795] is also not supported by this model. The model does include an empty container called "underlay" that can be augmented. For example the Segment Routing (SR) Policy [RFC9256] information can be augmented for the SR underlay by a future model.¶
Apart from the te-types:generic-path-constraints and te-types:generic-path-optimization, an additional leaf called "cos" for the class of service [RFC4124] is added to represent the Class-Type of traffic to be used as one of the path constraints.¶
This section summarizes the features of the VN YANG model.¶
Ability to support various VN and VNS Types¶
VN Type 2: Along with VN Members, the customer could also provide an abstract topology, this topology is provided by the Abstract TE Topology YANG Model.¶
module: ietf-vn
+--rw access-point
| +--rw ap* [id]
| +--rw id ap-id
| +--rw pe?
| | -> /nw:networks/network/node/tet:te-node-id
| +--rw max-bandwidth? te-types:te-bandwidth
| +--rw avl-bandwidth? te-types:te-bandwidth
| +--rw vn-ap* [id]
| +--rw id ap-id
| +--rw vn? -> /virtual-network/vn/id
| +--rw abstract-node? -> /nw:networks/network/node/node-id
| +--rw ltp? leafref
| +--ro max-bandwidth? te-types:te-bandwidth
+--rw virtual-network
+--rw vn* [id]
+--rw id vn-id
+--rw te-topology-identifier
| +--rw provider-id? te-global-id
| +--rw client-id? te-global-id
| +--rw topology-id? te-topology-id
+--rw abstract-node?
| -> /nw:networks/network/node/tet:te-node-id
+--rw vn-member* [id]
| +--rw id vnm-id
| +--rw src
| | +--rw ap? -> /access-point/ap/id
| | +--rw vn-ap-id?
| | | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| | +--rw multi-src? boolean {multi-src-dest}?
| +--rw dest
| | +--rw ap? -> /access-point/ap/id
| | +--rw vn-ap-id?
| | | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| | +--rw multi-dest? boolean {multi-src-dest}?
| +--rw connectivity-matrix-id? leafref
| +--rw underlay
| +--ro oper-status? te-types:te-oper-status
| +--ro if-selected? boolean {multi-src-dest}?
+--rw admin-status? te-types:te-admin-status
+--ro oper-status? te-types:te-oper-status
+--rw vn-level-diversity? te-types:te-path-disjointness
rpcs:
+---x vn-compute
+---w input
| +---w te-topology-identifier
| | +---w provider-id? te-global-id
| | +---w client-id? te-global-id
| | +---w topology-id? te-topology-id
| +---w abstract-node?
| | -> /nw:networks/network/node/tet:te-node-id
| +---w path-constraints
| | +---w te-bandwidth
| | | +---w (technology)?
| | | ...
| | +---w link-protection? identityref
| | +---w setup-priority? uint8
| | +---w hold-priority? uint8
| | +---w signaling-type? identityref
| | +---w path-metric-bounds
| | | +---w path-metric-bound* [metric-type]
| | | ...
| | +---w path-affinities-values
| | | +---w path-affinities-value* [usage]
| | | ...
| | +---w path-affinity-names
| | | +---w path-affinity-name* [usage]
| | | ...
| | +---w path-srlgs-lists
| | | +---w path-srlgs-list* [usage]
| | | ...
| | +---w path-srlgs-names
| | | +---w path-srlgs-name* [usage]
| | | ...
| | +---w disjointness? te-path-disjointness
| +---w cos? te-types:te-ds-class
| +---w optimizations
| | +---w (algorithm)?
| | +--:(metric) {path-optimization-metric}?
| | | ...
| | +--:(objective-function)
| | {path-optimization-objective-function}?
| | ...
| +---w vn-member-list* [id]
| | +---w id vnm-id
| | +---w src
| | | +---w ap? -> /access-point/ap/id
| | | +---w vn-ap-id?
| | | | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| | | +---w multi-src? boolean {multi-src-dest}?
| | +---w dest
| | | +---w ap? -> /access-point/ap/id
| | | +---w vn-ap-id?
| | | | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| | | +---w multi-dest? boolean {multi-src-dest}?
| | +---w connectivity-matrix-id? leafref
| | +---w underlay
| | +---w path-constraints
| | | +---w te-bandwidth
| | | | ...
| | | +---w link-protection? identityref
| | | +---w setup-priority? uint8
| | | +---w hold-priority? uint8
| | | +---w signaling-type? identityref
| | | +---w path-metric-bounds
| | | | ...
| | | +---w path-affinities-values
| | | | ...
| | | +---w path-affinity-names
| | | | ...
| | | +---w path-srlgs-lists
| | | | ...
| | | +---w path-srlgs-names
| | | | ...
| | | +---w disjointness? te-path-disjointness
| | +---w cos? te-types:te-ds-class
| | +---w optimizations
| | +---w (algorithm)?
| | ...
| +---w vn-level-diversity? te-types:te-path-disjointness
+--ro output
+--ro te-topology-identifier
| +--ro provider-id? te-global-id
| +--ro client-id? te-global-id
| +--ro topology-id? te-topology-id
+--ro abstract-node?
| -> /nw:networks/network/node/tet:te-node-id
+--ro vn-member-list* [id]
+--ro id vnm-id
+--ro src
| +--ro ap? -> /access-point/ap/id
| +--ro vn-ap-id?
| | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| +--ro multi-src? boolean {multi-src-dest}?
+--ro dest
| +--ro ap? -> /access-point/ap/id
| +--ro vn-ap-id?
| | -> /access-point/ap[id=current()/../ap]/vn-ap/id
| +--ro multi-dest? boolean {multi-src-dest}?
+--ro connectivity-matrix-id? leafref
+--ro underlay
+--ro if-selected? boolean {multi-src-dest}?
+--ro compute-status? vn-compute-status
+--ro error-info
+--ro error-description? string
+--ro error-timestamp? yang:date-and-time
+--ro error-reason? identityref¶
The VN YANG model is as follows:¶
<CODE BEGINS> file "ietf-vn@2025-01-27.yang"
module ietf-vn {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-vn";
prefix vn;
/* Import common YANG types */
import ietf-yang-types {
prefix yang;
reference
"RFC 6991: Common YANG Data Types";
}
/* Import network */
import ietf-network {
prefix nw;
reference
"RFC 8345: A YANG Data Model for Network Topologies";
}
/* Import network topology */
import ietf-network-topology {
prefix nt;
reference
"RFC 8345: A YANG Data Model for Network Topologies";
}
/* Import TE Common types */
import ietf-te-types {
prefix te-types;
reference
"RFC 8776: Common YANG Data Types for Traffic Engineering";
}
/* Import TE Topology */
import ietf-te-topology {
prefix tet;
reference
"RFC 8795: YANG Data Model for Traffic Engineering (TE)
Topologies";
}
organization
"IETF Traffic Engineering Architecture and Signaling (TEAS)
Working Group";
contact
"WG Web: <https://datatracker.ietf.org/wg/teas/>
WG List: <mailto:teas@ietf.org>
Editor: Young Lee <younglee.tx@gmail.com>
Editor: Dhruv Dhody <dhruv.ietf@gmail.com>";
description
"This module contains a YANG module for the Virtual Network
(VN). It describes a VN operation module that can take place
in the context of the Customer Network Controller (CNC) -
Multi-Domain Service Coordinator (MDSC) interface (CMI) of
the Abstraction and Control of TE Networks (ACTN)
architecture where the CNC is the actor of a VN
instantiation/modification/deletion as per RFC 8453.
This module uses the following abbreviations:
- VN: Virtual Network
- AP: Access Point
- VNAP: Virtual Network Access Point
- LTP: Link Termination Point
- PE: Provider Edge
- COS: Class of Service
Further, src and dest are used for source and
destination, respectively.
Copyright (c) 2025 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Revised BSD License set
forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC 9731; see the
RFC itself for full legal notices.";
revision 2025-01-27 {
description
"The initial version.";
reference
"RFC 9731: A YANG Data Model for Virtual Network (VN)
Operations";
}
/* Features */
feature multi-src-dest {
description
"Support for selection of one src or dest
among multiple.";
reference
"RFC 8453: Framework for Abstraction and Control of TE
Networks (ACTN)";
}
/* Typedef */
typedef vn-id {
type string {
length "1..max";
}
description
"A type definition for a Virtual Network (VN)
identifier.";
}
typedef ap-id {
type string {
length "1..max";
}
description
"A type definition for an Access Point (AP) identifier.";
}
typedef vnm-id {
type string {
length "1..max";
}
description
"A type definition for a VN member identifier.";
}
typedef vn-compute-status {
type te-types:te-common-status;
description
"A type definition for representing the VN compute status.
Note that all statuses apart from up and down are considered
to be unknown.";
}
/* identities */
identity vn-computation-error-reason {
description
"Base identity for VN computation error reasons.";
}
identity vn-computation-error-not-ready {
base vn-computation-error-reason;
description
"VN computation has failed because the MDSC is not
ready.";
}
identity vn-computation-error-no-cnc {
base vn-computation-error-reason;
description
"VN computation has failed because one or more dependent
CNCs are unavailable.";
}
identity vn-computation-error-no-resource {
base vn-computation-error-reason;
description
"VN computation has failed because there is no
available resource in one or more domains.";
}
identity vn-computation-error-path-not-found {
base vn-computation-error-reason;
description
"VN computation failed as no path found.";
}
identity vn-computation-ap-unknown {
base vn-computation-error-reason;
description
"VN computation failed as the source or destination Access
Point (AP) not known.";
}
/* Groupings */
grouping vn-member {
description
"The vn-member is described by this grouping.";
leaf id {
type vnm-id;
description
"A vn-member identifier.";
}
container src {
description
"The source of VN Member.";
leaf ap {
type leafref {
path "/access-point/ap/id";
}
description
"A reference to the source AP.";
}
leaf vn-ap-id {
type leafref {
path "/access-point/ap[id=current()/../ap]/vn-ap"
+ "/id";
}
description
"A reference to the source VNAP.";
}
leaf multi-src {
if-feature "multi-src-dest";
type boolean;
default "false";
description
"Is the source part of a multi-source, where
only one of the sources is enabled?";
}
}
container dest {
description
"The destination of the VN Member.";
leaf ap {
type leafref {
path "/access-point/ap/id";
}
description
"A reference to the destination AP.";
}
leaf vn-ap-id {
type leafref {
path "/access-point/ap[id=current()/../ap]/"
+ "vn-ap/id";
}
description
"A reference to the dest VNAP.";
}
leaf multi-dest {
if-feature "multi-src-dest";
type boolean;
default "false";
description
"Is the destination part of a multi-destination,
where only one of the destinations is enabled.";
}
}
leaf connectivity-matrix-id {
type leafref {
path "/nw:networks/nw:network/nw:node/tet:te/"
+ "tet:te-node-attributes/"
+ "tet:connectivity-matrices/"
+ "tet:connectivity-matrix/tet:id";
}
description
"A reference to the connectivity-matrix.";
reference
"RFC 8795: YANG Data Model for Traffic Engineering (TE)
Topologies";
}
container underlay {
description
"An empty container that can be augmented with underlay
technology information not supported by RFC 8795 (for
example - Segment Routing (SR).";
}
reference
"RFC 8454: Information Model for Abstraction and Control of TE
Networks (ACTN)";
}
grouping vn-policy {
description
"policy for VN-level diversity";
leaf vn-level-diversity {
type te-types:te-path-disjointness;
description
"The type of disjointness on the VN level (i.e., across all
VN members).";
}
}
/* Configuration data nodes */
container access-point {
description
"AP configurations.";
list ap {
key "id";
description
"The access-point identifier.";
leaf id {
type ap-id;
description
"An AP identifier unique within the scope of the entity
that controls the VN.";
}
leaf pe {
type leafref {
path "/nw:networks/nw:network/nw:node/tet:te-node-id";
}
description
"A reference to the PE node in the native TE Topology.";
}
leaf max-bandwidth {
type te-types:te-bandwidth;
description
"The max bandwidth of the AP.";
}
leaf avl-bandwidth {
type te-types:te-bandwidth;
description
"The available bandwidth of the AP.";
}
list vn-ap {
key "id";
leaf id {
type ap-id;
description
"A unique identifier for the VNAP.";
}
leaf vn {
type leafref {
path "/virtual-network/vn/id";
}
description
"A reference to the VN.";
}
leaf abstract-node {
type leafref {
path "/nw:networks/nw:network/nw:node/nw:node-id";
}
must '/nw:networks/nw:network/nw:node[nw:node-id='
+ 'current()/../abstract-node]/tet:te-node-id' {
description
"The associated network for the abstract-node
must be TE enabled.";
}
description
"A reference to the abstract node that represents
the VN.";
}
leaf ltp {
type leafref {
path "/nw:networks/nw:network/nw:node[nw:node-id="
+ "current()/../abstract-node]/nt:termination-point/"
+ "tet:te-tp-id";
}
description
"A reference to the Link Termination Point (LTP)
in the abstract-node, i.e., the LTP should be in
the abstract layer and not the underlying layer.";
reference
"RFC 8795: YANG Data Model for Traffic Engineering (TE)
Topologies";
}
leaf max-bandwidth {
type te-types:te-bandwidth;
config false;
description
"The max bandwidth of the VNAP.";
}
description
"List of VNAPs in this AP.";
}
}
reference
"RFC 8453: Framework for Abstraction and Control of TE
Networks (ACTN), Section 6";
}
container virtual-network {
description
"VN configurations.";
list vn {
key "id";
description
"A virtual network is identified by a vn-id.";
leaf id {
type vn-id;
description
"An identifier unique within the scope of the entity
that controls the VN.";
}
uses te-types:te-topology-identifier;
leaf abstract-node {
type leafref {
path "/nw:networks/nw:network/nw:node/tet:te-node-id";
}
description
"A reference to the abstract node in TE Topology.";
}
list vn-member {
key "id";
description
"List of vn-members in a VN.";
uses vn-member;
leaf oper-status {
type te-types:te-oper-status;
config false;
description
"The vn-member operational state.";
}
leaf if-selected {
if-feature "multi-src-dest";
type boolean;
default "false";
config false;
description
"Is the vn-member selected among the multi-src
or multi-dest options?";
}
}
leaf admin-status {
type te-types:te-admin-status;
default "up";
description
"VN administrative state.";
}
leaf oper-status {
type te-types:te-oper-status;
config false;
description
"VN operational state.";
}
uses vn-policy;
}
reference
"RFC 8453: Framework for Abstraction and Control of TE
Networks (ACTN)";
}
/* RPC */
rpc vn-compute {
description
"The VN computation without actual instantiation. This is
used by the CNC to get the VN results without actually
creating it in the network.
The input could include a reference to the single-node
-abstract topology. It could optionally also include
constraints and optimization criteria. The computation
is done based on the list of VN-members.
The output includes a reference to the single-node
-abstract topology with each VN-member including a
reference to the connectivity-matrix-id where the
path properties could be found. Error information is
also included.";
input {
uses te-types:te-topology-identifier;
leaf abstract-node {
type leafref {
path "/nw:networks/nw:network/nw:node/tet:te-node-id";
}
description
"A reference to the abstract node in TE Topology.";
}
uses te-types:generic-path-constraints;
leaf cos {
type te-types:te-ds-class;
description
"The class of service (COS).";
}
uses te-types:generic-path-optimization;
list vn-member-list {
key "id";
description
"List of VN-members in a VN.";
uses vn-member;
uses te-types:generic-path-constraints;
leaf cos {
type te-types:te-ds-class;
description
"The class of service.";
reference
"RFC 4124: Protocol Extensions for Support of
Diffserv-aware MPLS Traffic Engineering,
Section 4.3.1";
}
uses te-types:generic-path-optimization;
}
uses vn-policy;
}
output {
uses te-types:te-topology-identifier;
leaf abstract-node {
type leafref {
path "/nw:networks/nw:network/nw:node/tet:te-node-id";
}
description
"A reference to the abstract node in TE Topology.";
}
list vn-member-list {
key "id";
description
"List of VN-members in a VN.";
uses vn-member;
leaf if-selected {
if-feature "multi-src-dest";
type boolean;
default "false";
description
"Is the vn-member selected among the multi-src or
multi-dest options?";
reference
"RFC 8453: Framework for Abstraction and Control of TE
Networks (ACTN), Section 7";
}
leaf compute-status {
type vn-compute-status;
description
"The VN-member compute state.";
}
container error-info {
description
"Error information related to the VN member.";
leaf error-description {
type string {
length "1..max";
}
description
"Textual representation of the error that occurred
during VN compute.";
}
leaf error-timestamp {
type yang:date-and-time;
description
"Timestamp of the attempt.";
}
leaf error-reason {
type identityref {
base vn-computation-error-reason;
}
description
"Reason for the VN computation error.";
}
}
}
}
}
}
<CODE ENDS>¶
The YANG module specified in this document defines a schema for data that is designed to be accessed via network management protocols such as NETCONF [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.¶
The model presented in this document is used in the interface between the CNC and MDSC, which is referred to as CNC-MDSC Interface (CMI). Security risks, such as malicious attack and rogue elements attempting to connect to the various ACTN components, are possible. Furthermore, some ACTN components (e.g., MDSC) represent a single point of failure and threat vector. Also, there is a need to manage policy conflicts and eavesdropping on communication between different ACTN components.¶
There are a number of data nodes defined in this YANG module that are writable/creatable/deletable (i.e., "config true", which is the default). These data nodes may be considered sensitive or vulnerable in some network environments. Write operations (e.g., edit-config) to these data nodes without proper protection can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/vulnerability:¶
ap: This list includes a set of sensitive data that influences how the APs in the VN service are attached. By accessing the following data nodes, an attacker may be able to manipulate the VN.¶
vn-ap: This list includes a set of sensitive data that influences how the VN service is delivered. By accessing the following data nodes, an attacker may be able to manipulate the VN.¶
vn: This list includes a set of sensitive data that influences how the VN service is delivered. By accessing the following data nodes, an attacker may be able to manipulate the VN.¶
vn-member: This list includes a set of sensitive data that influences how the VN member in the VN service is delivered. By accessing the following data nodes, an attacker may be able to manipulate the VN member.¶
Some of the readable data nodes in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus important to control read access (e.g., via get, get-config, or notification) to these data nodes. These are the subtrees and data nodes and their sensitivity/vulnerability:¶
Some of the RPC operations in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus important to control access to these operations. These are the operations and their sensitivity/vulnerability:¶
IANA has made the following allocation for a URI in the "ns" registry within the "IETF XML Registry" registry group [RFC3688]:¶
IANA has made the following allocation for the VN YANG module (see Section 5in the "YANG Module Names" registry [RFC6020]:¶
At the creation of a VN, it is natural to provide VN-level constraints and optimization criteria. It should be noted that the VN YANG module described in this document relies on the TE-Topology Model in [RFC8795] by using a reference to an abstract node to achieve this. Further, the connectivity-matrix structure is used to assign the constraints and optimization criteria including delay, jitter, etc. [RFC8776] defines some of the metric-types; future documents are meant to augment it.¶
Note that the VN compute allows the inclusion of the constraints and the optimization criteria directly in the RPC to allow it to be used independently.¶
This section provides JSON examples of how the VN YANG model and TE topology model are used together to instantiate a VN.¶
The example in this section includes the following VNs:¶
L1---104---L4 L1---105---L5 L1---106---L6(md)
L1---107---L7 Underlay Path: L1---107---L7(md)
L2---204---L4 (S4 and S7) L1---108---L8(ms)
L3---308---L8 L3---308---L8(ms)
L1---108---L8
--- --- ---
VN1 VN2 VN3
--- --- ---
Note that the VN YANG model also includes the AP and VNAP, which shows various VNs using the same AP.¶
{
"ietf-vn:access-point": {
"ap": [
{
"id": "101",
"vn-ap": [
{
"id": "10101",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.11"
},
{
"id": "10102",
"vn": "2",
"abstract-node": "192.0.2.2",
"ltp": "203.0.113.12"
},
{
"id": "10103",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.13"
}
]
},
{
"id": "202",
"vn-ap": [
{
"id": "20201",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.21"
}
]
},
{
"id": "303",
"vn-ap": [
{
"id": "30301",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.31"
},
{
"id": "30303",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.33"
}
]
},
{
"id": "404",
"vn-ap": [
{
"id": "40401",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.41"
}
]
},
{
"id": "505",
"vn-ap": [
{
"id": "50502",
"vn": "2",
"abstract-node": "192.0.2.2",
"ltp": "203.0.113.52"
}
]
},
{
"id": "606",
"vn-ap": [
{
"id": "60603",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.63"
}
]
},
{
"id": "707",
"vn-ap": [
{
"id": "70701",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.71"
},
{
"id": "70703",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.73"
}
]
},
{
"id": "808",
"vn-ap": [
{
"id": "80801",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.81"
},
{
"id": "80803",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.83"
}
]
}
]
},
"ietf-vn:virtual-network": {
"vn": [
{
"id": "1",
"te-topology-identifier": {
"topology-id": "abstract1"
},
"abstract-node": "192.0.2.1",
"vn-member": [
{
"id": "104",
"src": {
"ap": "101",
"vn-ap-id": "10101"
},
"dest": {
"ap": "404",
"vn-ap-id": "40401"
},
"connectivity-matrix-id": 10104
},
{
"id": "107",
"src": {
"ap": "101",
"vn-ap-id": "10101"
},
"dest": {
"ap": "707",
"vn-ap-id": "70701"
},
"connectivity-matrix-id": 10107
},
{
"id": "204",
"src": {
"ap": "202",
"vn-ap-id": "20201"
},
"dest": {
"ap": "404",
"vn-ap-id": "40401"
},
"connectivity-matrix-id": 10204
},
{
"id": "308",
"src": {
"ap": "303",
"vn-ap-id": "30301"
},
"dest": {
"ap": "808",
"vn-ap-id": "80801"
},
"connectivity-matrix-id": 10308
},
{
"id": "108",
"src": {
"ap": "101",
"vn-ap-id": "10101"
},
"dest": {
"ap": "808",
"vn-ap-id": "80801"
},
"connectivity-matrix-id": 10108
}
]
},
{
"id": "2",
"te-topology-identifier": {
"topology-id": "abstract2"
},
"abstract-node": "192.0.2.2",
"vn-member": [
{
"id": "105",
"src": {
"ap": "101",
"vn-ap-id": "10102"
},
"dest": {
"ap": "505",
"vn-ap-id": "50502"
},
"connectivity-matrix-id": 20105
}
]
},
{
"id": "3",
"te-topology-identifier": {
"topology-id": "abstract3"
},
"abstract-node": "192.0.2.3",
"vn-member": [
{
"id": "106",
"src": {
"ap": "101",
"vn-ap-id": "10103"
},
"dest": {
"ap": "606",
"vn-ap-id": "60603",
"multi-dest": true
},
"connectivity-matrix-id": 30106,
"if-selected": false
},
{
"id": "107",
"src": {
"ap": "101",
"vn-ap-id": "10103"
},
"dest": {
"ap": "707",
"vn-ap-id": "70703",
"multi-dest": true
},
"connectivity-matrix-id": 30107,
"if-selected": true
},
{
"id": "108",
"src": {
"ap": "101",
"vn-ap-id": "10103",
"multi-src": true
},
"dest": {
"ap": "808",
"vn-ap-id": "80803",
},
"connectivity-matrix-id": 30108,
"if-selected": false
},
{
"id": "308",
"src": {
"ap": "303",
"vn-ap-id": "30303",
"multi-src": true
},
"dest": {
"ap": "808",
"vn-ap-id": "80803"
},
"connectivity-matrix-id": 30308,
"if-selected": true
}
]
}
]
}
}¶
This section provides JSON examples of the various TE topology instances.¶
The example in this section includes the following TE Topologies:¶
{
"ietf-network:networks": {
"network": [
{
"network-types": {
"ietf-te-topology:te-topology": {}
},
"network-id": "example:abstract1",
"ietf-te-topology:te-topology-identifier": {
"provider-id": 0,
"client-id": 0,
"topology-id": "example:abstract1"
},
"node": [
{
"node-id": "example:192.0.2.1",
"ietf-network-topology:termination-point": [
{
"tp-id": "example:1-0-1",
"ietf-te-topology:te-tp-id": "203.0.113.11"
},
{
"tp-id": "example:1-0-2",
"ietf-te-topology:te-tp-id": "203.0.113.21"
},
{
"tp-id": "example:1-0-3",
"ietf-te-topology:te-tp-id": "203.0.113.31"
},
{
"tp-id": "example:1-0-4",
"ietf-te-topology:te-tp-id": "203.0.113.41"
},
{
"tp-id": "example:1-0-7",
"ietf-te-topology:te-tp-id": "203.0.113.71"
},
{
"tp-id": "example:1-0-8",
"ietf-te-topology:te-tp-id": "203.0.113.81"
}
],
"ietf-te-topology:te-node-id": "192.0.2.1",
"ietf-te-topology:te": {
"te-node-attributes": {
"domain-id": 1,
"is-abstract": [
null
],
"connectivity-matrices": {
"is-allowed": true,
"path-constraints": {
"te-bandwidth": {
"generic": "0x1p10"
},
"disjointness": "node link srlg"
},
"connectivity-matrix": [
{
"id": 10104,
"from": {
"tp-ref": "example:1-0-1"
},
"to": {
"tp-ref": "example:1-0-4"
}
},
{
"id": 10107,
"from": {
"tp-ref": "example:1-0-1"
},
"to": {
"tp-ref": "example:1-0-7"
}
},
{
"id": 10204,
"from": {
"tp-ref": "example:1-0-2"
},
"to": {
"tp-ref": "example:1-0-4"
}
},
{
"id": 10308,
"from": {
"tp-ref": "example:1-0-3"
},
"to": {
"tp-ref": "example:1-0-8"
}
},
{
"id": 10108,
"from": {
"tp-ref": "example:1-0-1"
},
"to": {
"tp-ref": "example:1-0-8"
}
}
]
}
}
}
}
]
},
{
"network-types": {
"ietf-te-topology:te-topology": {}
},
"network-id": "example:abstract2",
"ietf-te-topology:te-topology-identifier": {
"provider-id": 0,
"client-id": 0,
"topology-id": "example:abstract2"
},
"node": [
{
"node-id": "example:192.0.2.2",
"ietf-network-topology:termination-point": [
{
"tp-id": "example:2-0-1",
"ietf-te-topology:te-tp-id": "203.0.113.12"
},
{
"tp-id": "example:2-0-5",
"ietf-te-topology:te-tp-id": "203.0.113.52"
}
],
"ietf-te-topology:te-node-id": "192.0.2.2",
"ietf-te-topology:te": {
"te-node-attributes": {
"domain-id": 1,
"is-abstract": [
null
],
"connectivity-matrices": {
"is-allowed": true,
"underlay": {
"enabled": true
},
"path-constraints": {
"te-bandwidth": {
"generic": "0x1p10"
}
},
"optimizations": {
"objective-function": {
"objective-function-type":
"ietf-te-types:of-maximize-residual-bandwidth"
}
},
"ietf-te-topology:connectivity-matrix": [
{
"id": 20105,
"from": {
"tp-ref": "example:2-0-1"
},
"to": {
"tp-ref": "example:2-0-5"
},
"underlay": {
"enabled": true,
"primary-path": {
"network-ref": "example:underlay",
"path-element": [
{
"path-element-id": 1,
"numbered-node-hop": {
"node-id": "198.51.100.44",
"hop-type": "strict"
}
},
{
"path-element-id": 2,
"numbered-node-hop": {
"node-id": "198.51.100.77",
"hop-type": "strict"
}
}
]
}
}
}
]
}
}
}
}
]
},
{
"network-types": {
"ietf-te-topology:te-topology": {}
},
"network-id": "example:underlay",
"ietf-te-topology:te-topology-identifier": {
"provider-id": 0,
"client-id": 0,
"topology-id": "example:underlay"
},
"node": [
{
"node-id": "example:198.51.100.11",
"ietf-te-topology:te-node-id": "198.51.100.11"
},
{
"node-id": "example:198.51.100.22",
"ietf-te-topology:te-node-id": "198.51.100.22"
},
{
"node-id": "example:198.51.100.33",
"ietf-te-topology:te-node-id": "198.51.100.33"
},
{
"node-id": "example:198.51.100.44",
"ietf-te-topology:te-node-id": "198.51.100.44"
},
{
"node-id": "example:198.51.100.55",
"ietf-te-topology:te-node-id": "198.51.100.55"
},
{
"node-id": "example:198.51.100.66",
"ietf-te-topology:te-node-id": "198.51.100.66"
},
{
"node-id": "example:198.51.100.77",
"ietf-te-topology:te-node-id": "198.51.100.77"
},
{
"node-id": "example:198.51.100.88",
"ietf-te-topology:te-node-id": "198.51.100.88"
},
{
"node-id": "example:198.51.100.99",
"ietf-te-topology:te-node-id": "198.51.100.99"
}
]
},
{
"network-types": {
"ietf-te-topology:te-topology": {}
},
"network-id": "example:abstract3",
"ietf-te-topology:te-topology-identifier": {
"provider-id": 0,
"client-id": 0,
"topology-id": "example:abstract3"
},
"node": [
{
"node-id": "example:192.0.2.3",
"ietf-network-topology:termination-point": [
{
"tp-id": "example:3-0-1",
"ietf-te-topology:te-tp-id": "203.0.113.13"
},
{
"tp-id": "example:3-0-3",
"ietf-te-topology:te-tp-id": "203.0.113.33"
},
{
"tp-id": "example:3-0-6",
"ietf-te-topology:te-tp-id": "203.0.113.63"
},
{
"tp-id": "example:3-0-7",
"ietf-te-topology:te-tp-id": "203.0.113.73"
},
{
"tp-id": "example:3-0-8",
"ietf-te-topology:te-tp-id": "203.0.113.83"
}
],
"ietf-te-topology:te-node-id": "192.0.2.3",
"ietf-te-topology:te": {
"te-node-attributes": {
"domain-id": 3,
"is-abstract": [
null
],
"connectivity-matrices": {
"is-allowed": true,
"path-constraints": {
"te-bandwidth": {
"generic": "0x1p10"
}
},
"connectivity-matrix": [
{
"id": 30107,
"from": {
"tp-ref": "example:3-0-1"
},
"to": {
"tp-ref": "example:3-0-7"
}
},
{
"id": 30106,
"from": {
"tp-ref": "example:3-0-1"
},
"to": {
"tp-ref": "example:3-0-6"
}
},
{
"id": 30108,
"from": {
"tp-ref": "example:3-0-1"
},
"to": {
"tp-ref": "example:3-0-8"
}
},
{
"id": 30308,
"from": {
"tp-ref": "example:3-0-3"
},
"to": {
"tp-ref": "example:3-0-8"
}
}
]
}
}
}
}
]
}
]
}
}¶
The authors would like to thank Xufeng Liu, Adrian Farrel, Tom Petch, Mohamed Boucadair, Italo Busi, Bo Wu, and Daniel King for their helpful comments and valuable suggestions.¶
Thanks to:¶