Internet DRAFT - draft-ietf-teas-actn-vn-yang
draft-ietf-teas-actn-vn-yang
TEAS Working Group Y. Lee, Ed.
Internet-Draft Samsung Electronics
Intended status: Standards Track D. Dhody, Ed.
Expires: 2 August 2024 Huawei
D. Ceccarelli
Cisco
I. Bryskin
Individual
B. Yoon
ETRI
30 January 2024
A YANG Data Model for Virtual Network (VN) Operations
draft-ietf-teas-actn-vn-yang-23
Abstract
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. This
document provides a YANG data model generally applicable to any mode
of VN operations. This includes VN operations as per Abstraction and
Control of TE Networks (ACTN) framework.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on 2 August 2024.
Copyright Notice
Copyright (c) 2024 IETF Trust and the persons identified as the
document authors. All rights reserved.
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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
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4
1.2. Tree Diagram . . . . . . . . . . . . . . . . . . . . . . 4
1.3. Prefixes in Data Node Names . . . . . . . . . . . . . . . 4
2. Use-case of VN YANG Model in the ACTN context . . . . . . . . 5
2.1. Type 1 VN . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2. Type 2 VN . . . . . . . . . . . . . . . . . . . . . . . . 7
3. High-Level Control Flows with Examples . . . . . . . . . . . 8
3.1. Type 1 VN Illustration . . . . . . . . . . . . . . . . . 8
3.2. Type 2 VN Illustration . . . . . . . . . . . . . . . . . 8
3.2.1. VN and AP Usage . . . . . . . . . . . . . . . . . . . 11
4. VN Model Usage . . . . . . . . . . . . . . . . . . . . . . . 11
4.1. Customer view of VN . . . . . . . . . . . . . . . . . . . 11
4.2. Auto-creation of VN by MDSC . . . . . . . . . . . . . . . 11
4.3. Innovative Services . . . . . . . . . . . . . . . . . . . 11
4.3.1. VN Compute . . . . . . . . . . . . . . . . . . . . . 12
4.3.2. Multi-sources and Multi-destinations . . . . . . . . 16
4.3.3. Others . . . . . . . . . . . . . . . . . . . . . . . 17
4.3.4. Summary . . . . . . . . . . . . . . . . . . . . . . . 17
5. VN YANG Model (Tree Structure) . . . . . . . . . . . . . . . 18
6. VN YANG Model . . . . . . . . . . . . . . . . . . . . . . . . 21
7. Security Considerations . . . . . . . . . . . . . . . . . . . 32
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 34
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 34
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 34
10.1. Normative References . . . . . . . . . . . . . . . . . . 34
10.2. Informative References . . . . . . . . . . . . . . . . . 36
Appendix A. Performance Constraints . . . . . . . . . . . . . . 37
Appendix B. JSON Example . . . . . . . . . . . . . . . . . . . . 37
B.1. VN JSON . . . . . . . . . . . . . . . . . . . . . . . . . 38
B.2. TE-topology JSON . . . . . . . . . . . . . . . . . . . . 44
Appendix C. Contributors Addresses . . . . . . . . . . . . . . . 52
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 52
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1. Introduction
Abstraction and Control of Traffic Engineered Networks (ACTN)
describes a set of management and control functions used to operate
one or more TE networks to construct Virtual Network (VN) that can be
represented to customers and that are built from abstractions of the
underlying TE networks [RFC8453]. This document provides a YANG
[RFC7950] data model generally applicable to any mode of VN
operation. ACTN is the primary example of the usage of the VN YANG
model but 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. The VN model defined
in this document can also work together with other customer service
models such as the Layer Three Virtual Private Network Service Model
(L3SM) [RFC8299], the Layer Two Virtual Private Network Service Model
(L2SM) [RFC8466] and the Layer One Connectivity Service Model (L1CSM)
[I-D.ietf-ccamp-l1csm-yang] to provide a complete life-cycle service
management and operations.
The YANG model discussed in this document basically provides the
following:
* Characteristics of Access Points (APs) that describe customer's
endpoint characteristics;
* Characteristics of Virtual Network Access Points (VNAP) that
describe how an AP is partitioned for multiple VNs sharing the AP
and its reference to a Link Termination Point (LTP) of the
Provider Edge (PE) Node;
* Characteristics of Virtual Networks (VNs) that describe the
customer's VN in terms of multiple VN Members comprising a VN,
multi-source and/or multi-destination characteristics of the VN
Member, the VN's reference to TE-topology's Abstract Node;
An abstract TE topology is a topology that contains abstract
topological elements (nodes, links) created and customised based on
customer's 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
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(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 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 [I-D.ietf-teas-yang-te] Model will
inevitably interact with the TE-Topology model for setting up actual
tunnels and LSPs under the tunnels.
Sections 2 and 3 provide a discussion of how the VN YANG model is
applicable to the ACTN context where Virtual Network Service (VNS)
operation is implemented for the Customer Network Controller (CNC)-
Multi-Domain Service Coordinator (MSDC) interface (CMI).
The YANG model on the 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, VN
computation, and 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]. The origin of the data is indicated
as per the origin metadata annotation.
1.1. Terminology
Refer to [RFC8453], [RFC7926], and [RFC8309] for the key terms used
in this document.
1.2. Tree Diagram
A simplified graphical representation of the data model is used in
Section 5 of this this document. The meaning of the symbols in these
diagrams is defined in [RFC8340].
1.3. Prefixes in Data Node Names
In this document, names of data nodes and other data model objects
are prefixed using the standard prefix associated with the
corresponding YANG imported modules, as shown in Table 1.
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+==========+=======================+===========+
| Prefix | YANG module | Reference |
+==========+=======================+===========+
| vn | ietf-vn | [RFCXXXX] |
+----------+-----------------------+-----------+
| yang | ietf-yang-types | [RFC6991] |
+----------+-----------------------+-----------+
| nw | ietf-network | [RFC8345] |
+----------+-----------------------+-----------+
| nt | ietf-network-topology | [RFC8345] |
+----------+-----------------------+-----------+
| te-types | ietf-te-types | [RFC8776] |
+----------+-----------------------+-----------+
| tet | ietf-te-topology | [RFC8795] |
+----------+-----------------------+-----------+
Table 1: Prefixes and corresponding YANG modules
Note: The RFC Editor will replace XXXX with the number assigned to
the RFC once this draft becomes an RFC.
2. Use-case of VN YANG Model in the ACTN context
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 |
+-----------------------+
Figure 1: ACTN CMI
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.
2.1. Type 1 VN
As defined in [RFC8453], a Virtual Network is a customer view of the
TE network. To recapitulate VN types from [RFC8453], Type 1 VN is
defined as follows:
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| 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 End-
Point, respectively.
This VN can be modeled as one abstract node representation as follows
in Figure 2:
+----------------------------------------------+
| |
L1----|..............................................|------L4
| . . |
| . AN1 . |
| . . |
| ..................................*.....|------L7
| . |
L2-----|....................................... |
| |
L3-----|..............................................|------L8
| |
+----------------------------------------------+
Figure 2: Abstract Node (One node topology)
Modeling a VN as one abstract node is the easiest way for customers
to express their end-to-end connectivity as shown in Figure 2.
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2.2. Type 2 VN
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.
Type 1 VN can be seen as a higher abstraction of a Type 2 VN (in
which along with a single node abstract topology, an underlay
topology and the intended path is specified). These topologies could
be mutually agreed between CNC and MDSC prior to VN creation or it
could be created as part of VN instantiation.
If a Type 2 VN is desired for some or all of 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 a 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 |
+----------------------------------------------+
Figure 3: Type 2 topology
As shown in Figure 3, 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.
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3. High-Level Control Flows with Examples
3.1. Type 1 VN Illustration
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 a
|<--------------------------------| 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) |
|<--------------------------------|
| |
3.2. Type 2 VN Illustration
For some VN members, the customer may want to "configure" explicit
path that connects its two end-points. 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)
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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 CNC creates the single abstract node topology, the following
diagram shows the message flow between CNC and MDSC to instantiate
this VN using VN and TE-Topology Model.
+--------+ +--------+
| 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 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.
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+--------+ +--------+
| 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 by the single
abstract node topology) could be a Native/White topology or a Grey
topology ([RFC8453]) that is further customised based on the
requirements of the customer and configured at MDSC.
Appendix B provides JSON examples for both VN model and 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.
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3.2.1. VN and AP Usage
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 allow a creation of VN with
only PE identifier as well. The customer access information could be
added later.
To achieve this the 'ap' container has a leaf for 'pe' node that
allows AP to be created with PE information. The vn-member (and vn)
could use APs that only have PE information initially.
4. VN Model Usage
4.1. Customer view of VN
The VN-YANG model allows to define a customer view, and allows the
customer to communicate using the VN constructs as described in the
[RFC8454]. It also allows to group the set 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 of having a separate YANG model for
the customer services as described in [RFC8309], which states that
service models do not make any assumption of how a service is
actually engineered and delivered for a customer.
4.2. Auto-creation of VN by MDSC
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 created automatically by the MDSC based on the
customer service model and local policy, even in these case the VN
YANG model can be used by the CNC to learn details of the underlying
VN created to meet the requirements of customer service model.
4.3. Innovative Services
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4.3.1. VN Compute
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 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 allow you to optionally include 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) |
|<----------------------------------------|
| |
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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:
* te-types:generic-path-constraints: This is used optionally in the
RPC input at the VN and/or VN-member level. The VN-member level
overrides the VN-level data. This also overrides any constraints
in the referenced abstract node in the TE topology.
* te-types:generic-path-optimization: This is used optionally in the
RPC input at the VN and/or VN-member level. The VN-member level
overrides the VN-level data. This also overrides any optimization
in the referenced abstract node in the TE topology.
* vn-member: This identifies the VN member in both RPC input and
output.
* vn-policy: This is used optionally in the RPC input to apply any
VN level policies.
When MDSC receives this RPC it computes the VN based on the input
provided in the RPC call. 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 the
each VN member as a reference to the connectivity-matrix-id. In case
of 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
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| | +---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* [vnm-id]
| | +---w vnm-id vnm-id
| | +---w src
| | | +---w src? -> /access-point/ap/ap-id
| | | +---w src-vn-ap-id?
| | | | -> /access-point/ap/vn-ap/vn-ap-id
| | | +---w multi-src? boolean {multi-src-dest}?
| | +---w dest
| | | +---w dest? -> /access-point/ap/ap-id
| | | +---w dest-vn-ap-id?
| | | | -> /access-point/ap/vn-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
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| | | | ...
| | | +---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* [vnm-id]
+--ro vnm-id vnm-id
+--ro src
| +--ro src? -> /access-point/ap/ap-id
| +--ro src-vn-ap-id?
| | -> /access-point/ap/vn-ap/vn-ap-id
| +--ro multi-src? boolean {multi-src-dest}?
+--ro dest
| +--ro dest? -> /access-point/ap/ap-id
| +--ro dest-vn-ap-id?
| | -> /access-point/ap/vn-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
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4.3.2. Multi-sources and Multi-destinations
In creating a virtual network, the list of sources or destinations or
both may not be pre-determined 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 module is shown for describing source container
and destination container. The following YANG tree shows how to
model multi-sources and multi-destinations.
module: ietf-vn
+--rw virtual-network
+--rw vn* [vn-id]
+--rw vn-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* [vnm-id]
| +--rw vnm-id vnm-id
| +--rw src
| | +--rw src? -> /access-point/ap/ap-id
| | +--rw src-vn-ap-id?
| | | -> /access-point/ap/vn-ap/vn-ap-id
| | +--rw multi-src? boolean {multi-src-dest}?
| +--rw dest
| | +--rw dest? -> /access-point/ap/ap-id
| | +--rw dest-vn-ap-id?
| | | -> /access-point/ap/vn-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
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4.3.3. Others
The VN YANG model can be easily augmented to support the mapping of
VN to the Services such as L3SM and L2SM as described in
[I-D.ietf-teas-te-service-mapping-yang].
The VN YANG model can be extended to support telemetry, performance
monitoring and network autonomics as described in
[I-D.ietf-teas-actn-pm-telemetry-autonomics].
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
SR-policy 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 cos for class of
service [RFC4124] is added to represent the Class-Type of traffic to
be used as one of the path constraints.
4.3.4. Summary
This section summarizes the innovative service features of the VN
YANG.
* Maintenance of AP and VNAP along with VN
* VN construct to group of edge-to-edge links
* VN Compute (pre-instantiate)
* Multi-Source / Multi-Destination
* Ability to support various VN and VNS Types
- VN Type 1: Customer configures the VN as a set of VN Members.
No other details need to be set by customer, making for a
simplified operations for the customer.
- 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.
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- Note that the VN Type is not explicitly identified in the VN
Yang model, as the VN Model is exactly the same for both VN
Type 1 and 2. The VN type can be implicitly known based on the
referenced TE topology and whether the connectivity matrix
includes the underlay path (Type 2) or not (Type 1).
5. VN YANG Model (Tree Structure)
module: ietf-vn
+--rw access-point
| +--rw ap* [ap-id]
| +--rw ap-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* [vn-ap-id]
| +--rw vn-ap-id ap-id
| +--rw vn? -> /virtual-network/vn/vn-id
| +--rw abstract-node?
| | -> /nw:networks/network/node/tet:te-node-id
| +--rw ltp? leafref
| +--ro max-bandwidth? te-types:te-bandwidth
+--rw virtual-network
+--rw vn* [vn-id]
+--rw vn-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* [vnm-id]
| +--rw vnm-id vnm-id
| +--rw src
| | +--rw src? -> /access-point/ap/ap-id
| | +--rw src-vn-ap-id? -> /access-point/ap/vn-ap/vn-ap-id
| | +--rw multi-src? boolean {multi-src-dest}?
| +--rw dest
| | +--rw dest? -> /access-point/ap/ap-id
| | +--rw dest-vn-ap-id? -> /access-point/ap/vn-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
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+--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* [vnm-id]
| | +---w vnm-id vnm-id
| | +---w src
| | | +---w src? -> /access-point/ap/ap-id
| | | +---w src-vn-ap-id? -> /access-point/ap/vn-ap/vn-ap-id
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| | | +---w multi-src? boolean {multi-src-dest}?
| | +---w dest
| | | +---w dest? -> /access-point/ap/ap-id
| | | +---w dest-vn-ap-id?
| | | | -> /access-point/ap/vn-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* [vnm-id]
+--ro vnm-id vnm-id
+--ro src
| +--ro src? -> /access-point/ap/ap-id
| +--ro src-vn-ap-id? -> /access-point/ap/vn-ap/vn-ap-id
| +--ro multi-src? boolean {multi-src-dest}?
+--ro dest
| +--ro dest? -> /access-point/ap/ap-id
| +--ro dest-vn-ap-id?
| | -> /access-point/ap/vn-ap/vn-ap-id
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| +--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
6. VN YANG Model
The YANG model is as follows:
<CODE BEGINS> file "ietf-vn@2024-01-30.yang"
module ietf-vn {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-vn";
prefix vn;
/* Import network */
import ietf-yang-types {
prefix yang;
reference
"RFC 6991: Common YANG Data Types";
}
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";
}
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/* 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>
: 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 Traffic Engineered Networks
(ACTN) architecture where the CNC is the actor of a VN
Instantiation/modification/deletion as per RFC 8453.
Copyright (c) 2024 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject to
the license terms contained in, the Revised BSD License set
forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(https://trustee.ietf.org/license-info).
This version of this YANG module is part of RFC XXXX; see the
RFC itself for full legal notices.";
revision 2024-01-30 {
description
"initial version.";
reference
"RFC XXXX: A YANG Data Model for Virtual Network (VN)
Operations";
}
/* Features */
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feature multi-src-dest {
description
"Support for selection of one src or destination
among multiple.";
reference
"RFC 8453: Framework for Abstraction and Control of TE
Networks (ACTN)";
}
/* Typedef */
typedef vn-id {
type string;
description
"A type definition for Virtual Network (VN)
identifier.";
}
typedef ap-id {
type string;
description
"A type definition for Access Point (AP) identifier.";
}
typedef vnm-id {
type string;
description
"A type definition for 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 status apart from up and down are considered as
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
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"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
CNC 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 source or destination Access Point
(AP) not known.";
}
/* Groupings */
grouping vn-ap {
description
"Virtual Network Access Points (VNAP) related information";
leaf vn-ap-id {
type ap-id;
description
"A unique identifier for the VNAP";
}
leaf vn {
type leafref {
path "/virtual-network/vn/vn-id";
}
description
"A reference to the VN";
}
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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 that
represent the VN";
}
leaf ltp {
type leafref {
path "/nw:networks/nw:network/nw:node/"
+ "nt:termination-point/tet:te-tp-id";
}
description
"A reference to Link Termination Point (LTP) in the
TE-topology";
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";
}
reference
"RFC 8453: Framework for Abstraction and Control of TE
Networks (ACTN), Section 6";
}
grouping access-point {
description
"AP related information";
leaf ap-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 {
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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 "vn-ap-id";
uses vn-ap;
description
"List of VNAP in this AP";
}
reference
"RFC 8453: Framework for Abstraction and Control of TE
Networks (ACTN), Section 6";
}
grouping vn-member {
description
"The vn-member is described by this grouping";
leaf vnm-id {
type vnm-id;
description
"A vn-member identifier";
}
container src {
description
"The source of VN Member";
leaf src {
type leafref {
path "/access-point/ap/ap-id";
}
description
"A reference to source AP";
}
leaf src-vn-ap-id {
type leafref {
path "/access-point/ap/vn-ap/vn-ap-id";
}
description
"A reference to source VNAP";
}
leaf multi-src {
if-feature "multi-src-dest";
type boolean;
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default "false";
description
"Is the source part of multi-source, where
only one of the source is enabled";
}
}
container dest {
description
"the destination of VN Member";
leaf dest {
type leafref {
path "/access-point/ap/ap-id";
}
description
"A reference to destination AP";
}
leaf dest-vn-ap-id {
type leafref {
path "/access-point/ap/vn-ap/vn-ap-id";
}
description
"A reference to dest VNAP";
}
leaf multi-dest {
if-feature "multi-src-dest";
type boolean;
default "false";
description
"Is destination part of multi-destination, where only one
of the destination 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 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
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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 diverisity";
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 "ap-id";
description
"access-point identifier";
uses access-point {
description
"The access-point information";
}
}
reference
"RFC 8453: Framework for Abstraction and Control of TE
Networks (ACTN), Section 6";
}
container virtual-network {
description
"VN configurations";
list vn {
key "vn-id";
description
"A virtual network is identified by a vn-id";
leaf vn-id {
type vn-id;
description
"An identifier unique within the scope of the entity
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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 "vnm-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 is selected among the multi-src/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)";
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}
/* 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";
}
uses te-types:generic-path-optimization;
list vn-member-list {
key "vnm-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
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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 "vnm-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 is selected among the multi-src/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;
description
"Textual representation of the error occurred during
VN compute.";
}
leaf error-timestamp {
type yang:date-and-time;
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description
"Timestamp of the attempt.";
}
leaf error-reason {
type identityref {
base vn-computation-error-reason;
}
description
"Reason for the VN computation error.";
}
}
}
}
}
}
<CODE ENDS>
7. Security Considerations
The configuration, state, and action data defined in this document
are designed to be accessed via a management protocol with a secure
transport layer, 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 NETCONF access control model [RFC8341] provides the means to
restrict access for particular NETCONF users to a preconfigured
subset of all available NETCONF protocol operations and content.
The model presented in this document is used in the interface between
the Customer Network Controller (CNC) and Multi-Domain Service
Coordinator (MDSC), which is referred to as CNC-MDSC Interface (CMI).
Therefore, many security risks such as malicious attack and rogue
elements attempting to connect to various ACTN components.
Furthermore, some ACTN components (e.g., MDSC) represent a single
point of failure and threat vector and must also manage policy
conflicts and eavesdropping of communication between different ACTN
components.
A number of configuration data nodes defined in this document are
writable/deletable (i.e., "config true") These data nodes may be
considered sensitive or vulnerable in some network environments.
These are the subtrees and data nodes and their sensitivity/
vulnerability:
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* ap: this list includes a set of sensitive data that influences how
the access points in the VN service are attached. By accessing
the following data nodes, an attacker may be able to manipulate
the VN.
- ap-id
- max-bandwidth
- avl-bandwidth
* 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-ap-id
- vn
- abstract-node
- ltp
* 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-id
- vn-topology-id
- abstract-node
* 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.
- vnm-id
- src
- src-vn-ap-id
- dest
- dest-vn-ap-id
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- connectivity-matrix-id
8. IANA Considerations
IANA is requested to make the following allocation for the URIs in
the "ns" subregistry within the "IETF XML Registry" [RFC3688]:
--------------------------------------------------------------------
URI: urn:ietf:params:xml:ns:yang:ietf-vn
Registrant Contact: The IESG.
XML: N/A, the requested URI is an XML namespace.
--------------------------------------------------------------------
IANA is requested to make the following allocation for the YANG
module in the "YANG Module Names" registry [RFC6020]:
--------------------------------------------------------------------
name: ietf-vn
namespace: urn:ietf:params:xml:ns:yang:ietf-vn
prefix: vn
reference: RFC XXXX
--------------------------------------------------------------------
9. Acknowledgments
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 Andy Bierman for YANGDIR review. Thanks to Darren Dukes
for RTGDIR review.
10. References
10.1. Normative References
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://www.rfc-editor.org/info/rfc3688>.
[RFC4124] Le Faucheur, F., Ed., "Protocol Extensions for Support of
Diffserv-aware MPLS Traffic Engineering", RFC 4124,
DOI 10.17487/RFC4124, June 2005,
<https://www.rfc-editor.org/info/rfc4124>.
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[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>.
[RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types",
RFC 6991, DOI 10.17487/RFC6991, July 2013,
<https://www.rfc-editor.org/info/rfc6991>.
[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>.
[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>.
[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>.
[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>.
[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>.
[RFC8345] Clemm, A., Medved, J., Varga, R., Bahadur, N.,
Ananthakrishnan, H., and X. Liu, "A YANG Data Model for
Network Topologies", RFC 8345, DOI 10.17487/RFC8345, March
2018, <https://www.rfc-editor.org/info/rfc8345>.
[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>.
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[RFC8776] Saad, T., Gandhi, R., Liu, X., Beeram, V., and I. Bryskin,
"Common YANG Data Types for Traffic Engineering",
RFC 8776, DOI 10.17487/RFC8776, June 2020,
<https://www.rfc-editor.org/info/rfc8776>.
[RFC8795] Liu, X., Bryskin, I., Beeram, V., Saad, T., Shah, H., and
O. Gonzalez de Dios, "YANG Data Model for Traffic
Engineering (TE) Topologies", RFC 8795,
DOI 10.17487/RFC8795, August 2020,
<https://www.rfc-editor.org/info/rfc8795>.
10.2. Informative References
[I-D.ietf-ccamp-l1csm-yang]
Lee, Y., Lee, K., Zheng, H., de Dios, O. G., and D.
Ceccarelli, "A YANG Data Model for L1 Connectivity Service
Model (L1CSM)", Work in Progress, Internet-Draft, draft-
ietf-ccamp-l1csm-yang-24, 11 January 2024,
<https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-
l1csm-yang-24>.
[I-D.ietf-teas-actn-pm-telemetry-autonomics]
Lee, Y., Dhody, D., Vilalta, R., King, D., and D.
Ceccarelli, "YANG models for Virtual Network (VN)/TE
Performance Monitoring Telemetry and Scaling Intent
Autonomics", Work in Progress, Internet-Draft, draft-ietf-
teas-actn-pm-telemetry-autonomics-11, 10 September 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-teas-
actn-pm-telemetry-autonomics-11>.
[I-D.ietf-teas-te-service-mapping-yang]
Lee, Y., Dhody, D., Fioccola, G., Wu, Q., Ceccarelli, D.,
and J. Tantsura, "Traffic Engineering (TE) and Service
Mapping YANG Data Model", Work in Progress, Internet-
Draft, draft-ietf-teas-te-service-mapping-yang-14, 12
September 2023, <https://datatracker.ietf.org/doc/html/
draft-ietf-teas-te-service-mapping-yang-14>.
[I-D.ietf-teas-yang-te]
Saad, T., Gandhi, R., Liu, X., Beeram, V. P., and I.
Bryskin, "A YANG Data Model for Traffic Engineering
Tunnels, Label Switched Paths and Interfaces", Work in
Progress, Internet-Draft, draft-ietf-teas-yang-te-35, 12
January 2024, <https://datatracker.ietf.org/doc/html/
draft-ietf-teas-yang-te-35>.
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[RFC7926] Farrel, A., Ed., Drake, J., Bitar, N., Swallow, G.,
Ceccarelli, D., and X. Zhang, "Problem Statement and
Architecture for Information Exchange between
Interconnected Traffic-Engineered Networks", BCP 206,
RFC 7926, DOI 10.17487/RFC7926, July 2016,
<https://www.rfc-editor.org/info/rfc7926>.
[RFC8299] Wu, Q., Ed., Litkowski, S., Tomotaki, L., and K. Ogaki,
"YANG Data Model for L3VPN Service Delivery", RFC 8299,
DOI 10.17487/RFC8299, January 2018,
<https://www.rfc-editor.org/info/rfc8299>.
[RFC8309] Wu, Q., Liu, W., and A. Farrel, "Service Models
Explained", RFC 8309, DOI 10.17487/RFC8309, January 2018,
<https://www.rfc-editor.org/info/rfc8309>.
[RFC8453] Ceccarelli, D., Ed. and Y. Lee, Ed., "Framework for
Abstraction and Control of TE Networks (ACTN)", RFC 8453,
DOI 10.17487/RFC8453, August 2018,
<https://www.rfc-editor.org/info/rfc8453>.
[RFC8454] Lee, Y., Belotti, S., Dhody, D., Ceccarelli, D., and B.
Yoon, "Information Model for Abstraction and Control of TE
Networks (ACTN)", RFC 8454, DOI 10.17487/RFC8454,
September 2018, <https://www.rfc-editor.org/info/rfc8454>.
[RFC8466] Wen, B., Fioccola, G., Ed., Xie, C., and L. Jalil, "A YANG
Data Model for Layer 2 Virtual Private Network (L2VPN)
Service Delivery", RFC 8466, DOI 10.17487/RFC8466, October
2018, <https://www.rfc-editor.org/info/rfc8466>.
Appendix A. Performance Constraints
At the time of creation of VN, it is natural to provide VN level
constraints and optimization criteria. It should be noted that this
YANG module relies on the TE-Topology Model [RFC8795] by using a
reference to an abstract node to achieve this. Further,
connectivity-matrix structure is used to assign the constraints and
optimization criteria include delay, jitter etc. [RFC8776] defines
some of the metric-types already and future documents are meant to
augment it.
Note that the VN compute allows inclusion of the constraints and the
optimization criteria directly in the RPC to allow it to be used
independently.
Appendix B. JSON Example
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B.1. VN JSON
This section provides JSON examples as to how VN YANG model and TE
topology model are used together to instantiate VN.
The example in this section includes following VN
* VN1 (Type 1): Which maps to the single node topology abstract1 and
consist of VN Members 104 (L1 to L4), 107 (L1 to L7), 204 (L2 to
L4), 308 (L3 to L8) and 108 (L1 to L8).
* VN2 (Type 2): Which maps to the single node topology abstract2,
this topology has an underlay topology (called underlay). This VN
has a single VN member 105 (L1 to L5) and an underlay path (S4 and
S7) has been set in the connectivity matrix of abstract2 topology;
* VN3 (Type 1): This VN has a multi-source and multi-destination
feature enabled. VN Member 106 (L1 to L6) and 107 (L1 to L7)
showcase multi-dest and VN Member 108 (L1 to L8) and 308 (L3 to
L8) showcase multi-src feature. The selected VN-member is known
via the field "if-selected" and the corresponding connectivity-
matrix-id.
L1---104---L4 L1---105---L5 L1---106---L6(md)
L1---107---L7 Underlay Path: L1---107---L7(md)
L2---204---L4 (S2 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 include the AP and VNAP which shows
various VN using the same AP.
{
"ietf-vn:access-point": {
"ap": [
{
"ap-id": "101",
"vn-ap": [
{
"vn-ap-id": "10101",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.11"
},
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{
"vn-ap-id": "10102",
"vn": "2",
"abstract-node": "192.0.2.2",
"ltp": "203.0.113.12"
},
{
"vn-ap-id": "10103",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.13"
}
]
},
{
"ap-id": "202",
"vn-ap": [
{
"vn-ap-id": "20201",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.21"
}
]
},
{
"ap-id": "303",
"vn-ap": [
{
"vn-ap-id": "30301",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.31"
},
{
"vn-ap-id": "30303",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.33"
}
]
},
{
"ap-id": "404",
"vn-ap": [
{
"vn-ap-id": "40401",
"vn": "1",
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"abstract-node": "192.0.2.1",
"ltp": "203.0.113.41"
}
]
},
{
"ap-id": "505",
"vn-ap": [
{
"vn-ap-id": "50502",
"vn": "2",
"abstract-node": "192.0.2.2",
"ltp": "203.0.113.52"
}
]
},
{
"ap-id": "606",
"vn-ap": [
{
"vn-ap-id": "60603",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.63"
}
]
},
{
"ap-id": "707",
"vn-ap": [
{
"vn-ap-id": "70701",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.71"
},
{
"vn-ap-id": "70703",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.73"
}
]
},
{
"ap-id": "808",
"vn-ap": [
{
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"vn-ap-id": "80801",
"vn": "1",
"abstract-node": "192.0.2.1",
"ltp": "203.0.113.81"
},
{
"vn-ap-id": "80803",
"vn": "3",
"abstract-node": "192.0.2.3",
"ltp": "203.0.113.83"
}
]
}
]
},
"ietf-vn:virtual-network": {
"vn": [
{
"vn-id": "1",
"te-topology-identifier": {
"topology-id": "abstract1"
},
"abstract-node": "192.0.2.1",
"vn-member": [
{
"vnm-id": "104",
"src": {
"src": "101",
"src-vn-ap-id": "10101"
},
"dest": {
"dest": "404",
"dest-vn-ap-id": "40401"
},
"connectivity-matrix-id": 10104
},
{
"vnm-id": "107",
"src": {
"src": "101",
"src-vn-ap-id": "10101"
},
"dest": {
"dest": "707",
"dest-vn-ap-id": "70701"
},
"connectivity-matrix-id": 10107
},
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{
"vnm-id": "204",
"src": {
"src": "202",
"src-vn-ap-id": "20201"
},
"dest": {
"dest": "404",
"dest-vn-ap-id": "40401"
},
"connectivity-matrix-id": 10204
},
{
"vnm-id": "308",
"src": {
"src": "303",
"src-vn-ap-id": "30301"
},
"dest": {
"dest": "808",
"dest-vn-ap-id": "80801"
},
"connectivity-matrix-id": 10308
},
{
"vnm-id": "108",
"src": {
"src": "101",
"src-vn-ap-id": "10101"
},
"dest": {
"dest": "808",
"dest-vn-ap-id": "80801"
},
"connectivity-matrix-id": 10108
}
]
},
{
"vn-id": "2",
"te-topology-identifier": {
"topology-id": "abstract2"
},
"abstract-node": "192.0.2.2",
"vn-member": [
{
"vnm-id": "105",
"src": {
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"src": "101",
"src-vn-ap-id": "10102"
},
"dest": {
"dest": "505",
"dest-vn-ap-id": "50502"
},
"connectivity-matrix-id": 20105
}
]
},
{
"vn-id": "3",
"te-topology-identifier": {
"topology-id": "abstract3"
},
"abstract-node": "192.0.2.3",
"vn-member": [
{
"vnm-id": "106",
"src": {
"src": "101",
"src-vn-ap-id": "10103"
},
"dest": {
"dest": "606",
"dest-vn-ap-id": "60603",
"multi-dest": true
},
"connectivity-matrix-id": 30106,
"if-selected": false
},
{
"vnm-id": "107",
"src": {
"src": "101",
"src-vn-ap-id": "10103"
},
"dest": {
"dest": "707",
"dest-vn-ap-id": "70703",
"multi-dest": true
},
"connectivity-matrix-id": 30107,
"if-selected": true
},
{
"vnm-id": "108",
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"src": {
"src": "101",
"src-vn-ap-id": "10103",
"multi-src": true
},
"dest": {
"dest": "808",
"dest-vn-ap-id": "80803"
},
"connectivity-matrix-id": 30108,
"if-selected": false
},
{
"vnm-id": "308",
"src": {
"src": "303",
"src-vn-ap-id": "30303",
"multi-src": true
},
"dest": {
"dest": "808",
"dest-vn-ap-id": "80803"
},
"connectivity-matrix-id": 30308,
"if-selected": true
}
]
}
]
}
}
B.2. TE-topology JSON
This section provides JSON examples of the various TE topology
instances.
The example in this section includes following TE Topologies
* abstract1: a single node TE topology referenced by VN1. We also
show how disjointness (node, link, srlg) is supported in the
example on the connectivity matrices.
* abstract2: a single node TE topology referenced by VN2 with
underlay path.
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* underlay: the topology with multiple nodes (in the underlay path
of abstract2). For brevity, the example includes only the node
and other parameters are not included.
* abstract3: a single node TE topology referenced by VN3.
{
"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"
}
],
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"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"
},
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"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": [
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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"
}
}
]
}
}
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}
]
}
}
}
}
]
},
{
"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"
},
{
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"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,
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"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"
}
}
]
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}
}
}
}
]
}
]
}
}
Appendix C. Contributors Addresses
Qin Wu
Huawei Technologies
Email: bill.wu@huawei.com
Peter Park
KT
Email: peter.park@kt.com
Haomian Zheng
Huawei Technologies
Email: zhenghaomian@huawei.com
Xian Zhang
Huawei Technologies
Email: zhang.xian@huawei.com
Sergio Belotti
Nokia
Email: sergio.belotti@nokia.com
Takuya Miyasaka
KDDI
Email: ta-miyasaka@kddi.com
Kenichi Ogaki
KDDI
Email: ke-oogaki@kddi.com
Authors' Addresses
Young Lee (editor)
Samsung Electronics
Email: younglee.tx@gmail.com
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Dhruv Dhody (editor)
Huawei
India
Email: dhruv.ietf@gmail.com
Daniele Ceccarelli
Cisco
Email: daniele.ietf@gmail.com
Igor Bryskin
Individual
Email: i_bryskin@yahoo.com
Bin Yeong Yoon
ETRI
Email: byyun@etri.re.kr
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