Framework and Data Model for OTN Network Slicing
draft-ietf-ccamp-yang-otn-slicing-01
The information below is for an old version of the document.
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|---|---|---|---|
| Authors | Aihua Guo , Luis M. Contreras , Sergio Belotti , Reza Rokui , Yunbin Xu , Yang Zhao , Xufeng Liu | ||
| Last updated | 2022-03-04 (Latest revision 2022-01-26) | ||
| Replaces | draft-zheng-ccamp-yang-otn-slicing | ||
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draft-ietf-ccamp-yang-otn-slicing-01
CCAMP Working Group A. Guo
Internet-Draft Futurewei Technologies
Intended status: Standards Track L.M. Contreras
Expires: 6 September 2022 Telefonica
S. Belotti
Nokia
R. Rokui
Ciena
Y. Xu
CAICT
Y. Zhao
China Mobile
X. Liu
IBM Corporation
5 March 2022
Framework and Data Model for OTN Network Slicing
draft-ietf-ccamp-yang-otn-slicing-01
Abstract
The requirement of slicing network resources with desired quality of
service is emerging at every network technology, including the
Optical Transport Networks (OTN). As a part of the transport
network, OTN can provide hard pipes with guaranteed data isolation
and deterministic low latency, which are highly demanded in the
Service Level Agreement (SLA).
This document describes a framework for OTN network slicing and a
YANG data model augmentation of the OTN topology model. Additional
YANG data model augmentations will be defined in a future version of
this draft.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
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This Internet-Draft will expire on 6 September 2022.
Copyright Notice
Copyright (c) 2022 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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Prefixes in Data Node Names . . . . . . . . . . . . . . . 3
1.3. Definition of OTN Slice . . . . . . . . . . . . . . . . . 4
2. Use Cases for OTN Network Slicing . . . . . . . . . . . . . . 5
2.1. Leased Line Services with OTN . . . . . . . . . . . . . . 6
2.2. Co-construction and Sharing . . . . . . . . . . . . . . . 6
2.3. Wholesale of optical resources . . . . . . . . . . . . . 6
2.4. Vertical dedicated network with OTN . . . . . . . . . . . 7
2.5. End-to-end network slicing . . . . . . . . . . . . . . . 7
3. Framework for OTN slicing . . . . . . . . . . . . . . . . . . 8
4. YANG Data Model for OTN Slicing Configuration . . . . . . . . 11
4.1. OTN Slicing YANG Model for MPI . . . . . . . . . . . . . 11
4.1.1. MPI YANG Model Overview . . . . . . . . . . . . . . . 12
4.1.2. MPI YANG Model Tree . . . . . . . . . . . . . . . . . 12
4.1.3. MPI YANG Code . . . . . . . . . . . . . . . . . . . . 12
4.2. OTN Slicing YANG Model for OTN-SC NBI . . . . . . . . . . 16
4.2.1. NBI YANG Model Overview . . . . . . . . . . . . . . . 16
4.2.2. NBI YANG Model Tree for Transport Network Slice . . . 17
4.2.3. NBI YANG Code for Transport Network Slice . . . . . . 18
4.2.4. NBI YANG Model Tree for OTN slice . . . . . . . . . . 29
4.2.5. NBI YANG Code for OTN Slice . . . . . . . . . . . . . 29
5. Manageability Considerations . . . . . . . . . . . . . . . . 29
6. Security Considerations . . . . . . . . . . . . . . . . . . . 29
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 30
8. Normative References . . . . . . . . . . . . . . . . . . . . 30
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 33
Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 34
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1. Introduction
The requirement of slicing network resources with desired quality of
service is emerging at every network technology, including the
Optical Transport Networks (OTN). As a part of the transport
network, OTN can provide hard pipes with guaranteed data isolation
and deterministic low latency, which are highly demanded in the
Service Level Agreement (SLA). This document describes a framework
for OTN network slicing and a YANG data model augmentation of the OTN
topology model. Additional YANG data model augmentations will be
defined in a future version of this draft.
1.1. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
The terminology for describing YANG data models is found in
[RFC7950].
1.2. 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 |
+==========+==============================+===========+
| yang | ietf-yang-types | [RFC6991] |
+----------+------------------------------+-----------+
| inet | ietf-inet-types | [RFC6991] |
+----------+------------------------------+-----------+
| nt | ietf-network-topology | [RFC8345] |
+----------+------------------------------+-----------+
| nw | ietf-network-topology | [RFC8345] |
+----------+------------------------------+-----------+
| tet | ietf-te-topology | [RFC8795] |
+----------+------------------------------+-----------+
| te-types | ietf-te-types | [RFC8776] |
+----------+------------------------------+-----------+
| otnt | ietf-otn-topology | [RFCYYYY] |
+----------+------------------------------+-----------+
| l1-types | ietf-layer1-types | [RFCZZZZ] |
+----------+------------------------------+-----------+
| tns | ietf-transport-network-slice | RFCXXXX |
+----------+------------------------------+-----------+
| otns | ietf-otn-slice | RFCXXXX |
+----------+------------------------------+-----------+
Table 1: Prefixes and Corresponding YANG Modules
RFC Editor Note: Please replace XXXX with the RFC number assigned to
this document. Please replace YYYY with the RFC number assigned to
[I-D.ietf-ccamp-otn-topo-yang]. Please replace ZZZZ with the RFC
number assigned to [I-D.ietf-ccamp-layer1-types]. Please remove this
note.
1.3. Definition of OTN Slice
An OTN slice is an OTN virtual network topology connecting a number
of OTN endpoints using a set of shared or dedicated OTN network
resources to satisfy specific service level objectives (SLOs).
An OTN slice is a technology-specific realization of an IETF network
slice [I-D.ietf-teas-ietf-network-slices] in the OTN domain, with the
capability of configuring slice resources in the term of OTN
technologies. Therefore, all the terms and definitions concerning
network slicing as defined in [I-D.ietf-teas-ietf-network-slices]
apply to OTN slicing.
An OTN slice can span multiple OTN administrative domains,
encompassing access links, intra-domain paths, and inter-domain
links. An OTN slice may include multiple endpoints, each associated
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with a set of physical or logical resources, e.g. optical port or
time slots, at the termination point (TP) of an access link or inter-
domain link at an OTN provider edge (PE) equipment.
An end-to-end OTN slice may be composed of multiple OTN segment
slices in a hierarchical or sequential (or stitched) combination.
Figure 1 illustrates the scope of OTN slices in multi-domain
environment.
<------------------End-to-end OTN Slice---------------->
<- OTN Segment Slice 1 ---> <-- OTN Segment Slice 2 -->
+-------------------------+ +-----------------------+
| +-----+ +-------+ | | +-------+ +-----+|
+----+ | | OTN | | OTN | | | | OTN | | OTN || +----+
| CE +-+-o PE +-...--+ Borde o--+--+-o Borde +-...--+ PE o+--+ CE |
+----+||/| | | Node |\ || | | Node | | || |+----+
|||+-----+ +-------+| || | +-------+ +-----+| |
||| OTN Domain 1 | || | OTN Domain 2 | |
|++----------------------+-+| +-----------------------+ |
| | | | |
| +-----+ +-----------+ | |
| | | | |
V V V V V
Access OTN Slice Inter-domain Access
Link Endpoint Link Link
Figure 1: OTN Slice
OTN slices may be pre-configured by the management plane and
presented to the customer via the northbound interface (NBI), or be
dynamically provisioned by a higher layer slice controller, e.g. an
IETF network slice controller (IETF NSC) through the NBI. The OTN
slice is provided by a service provider to a customer to be used as
though it was part of the customer's own networks.
2. Use Cases for OTN Network Slicing
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2.1. Leased Line Services with OTN
For end business customers (like OTT or enterprises), leased lines
have the advantage of providing high-speed connections with low
costs. On the other hand, the traffic control of leased lines is
very challenging due to rapid changes in service demands. Carriers
are recommended to provide network-level slicing capabilities to meet
this demand. Based on such capabilities, private network users have
full control over the sliced resources which have been allocated to
them and which could be used to support their leased lines, when
needed. Users may formulate policies based on the demand for
services and time to schedule the resources from the entire network's
perspective flexibly. For example, the bandwidth between any two
points may be established or released based on the time or monitored
traffic characteristics. The routing and bandwidth may be adjusted
at a specific time interval to maximize network resource utilization
efficiency.
2.2. Co-construction and Sharing
Co-construction and sharing of a network are becoming a popular means
among service providers to reduce networking building CAPEX. For Co-
construction and sharing case, there are typically multiple co-
founders for the same network. For example, one founder may provide
optical fibres and another founder may provide OTN equipment, while
each occupies a certain percentage of the usage rights of the network
resources. In this scenario, the network O&M is performed by a
certain founder in each region, where the same founder usually
deploys an independent management and control system. The other
founders of the network use each other's management and control
system to provision services remotely. In this scenario, different
founders' network resources need to be automatically (associated)
divided, isolated, and visualized. All founders may share or have
independent O&M capabilities, and should be able to perform service-
level provisioning in their respective slices.
2.3. Wholesale of optical resources
In the optical resource wholesale market, smaller, local carriers and
wireless carriers may rent resources from larger carriers, or
infrastructure carriers instead of building their networks.
Likewise, international carriers may rent resources from respective
local carriers and local carriers may lease their owned networks to
each other to achieve better network utilization efficiency. From
the perspective of a resource provider, it is crucial that a network
slice is timely configured to meet traffic matrix requirements
requested by its tenants. The support for multi-tenancy within the
resource provider's network demands that the network slices are
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qualitatively isolated from each other to meet the requirements for
transparency, non-interference, and security. Typically, a resource
purchaser expects to use the leased network resources flexibly, just
like they are self-constructed. Therefore, the purchaser is not only
provided with a network slice, but also the full set of
functionalities for operating and maintaining the network slice. The
purchaser also expects to, flexibly and independently, schedule and
maintain physical resources to support their own end-to-end
automation using both leased and self-constructed network resources.
2.4. Vertical dedicated network with OTN
Vertical industry slicing is an emerging category of network slicing
due to the high demand for private high-speed network interconnects
for industrial applications. In this scenario, the biggest challenge
is to implement differentiated optical network slices based on the
requirements from different industries. For example, in the
financial industry, to support high-frequency transactions, the slice
must ensure to provide the minimum latency along with the mechanism
for latency management. For the healthcare industry, online
diagnosis network and software capabilities to ensure the delivery of
HD video without frame loss. For bulk data migration in data
centers, the network needs to support on-demand, large-bandwidth
allocation. In each of the aforementioned vertical industry
scenarios, the bandwidth shall be adjusted as required to ensure
flexible and efficient network resource usage.
2.5. End-to-end network slicing
In an end-to-end network slicing scenario such as 5G network slicing
[TS.28.530-3GPP], an IETF network slice
[I-D.ietf-teas-ietf-network-slices] provides the required
connectivity between other different segments of an end-to-end
network slice, such as the Radio Access Network (RAN) and the Core
Network (CN) segments, with a specific performance commitment. An
IETF network slice could be composed of network slices from multiple
technological and administrative domains. An IETF network slice can
be realized by using or combining multiple underlying OTN slices with
OTN resources, e.g. ODU time slots or ODU containers, to achieve
end-to-end slicing across the transport domain.
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3. Framework for OTN slicing
OTN slices may be abstracted differently depending on the requirement
contained in the configuration provided by the slice customer.
Whereas the customer requests an OTN slice to provide connectivities
between specified endpoints, an OTN slice can be abstracted as a set
of endpoint-to-endpoint links, with each link formed by an end-to-end
tunnel across the underlying OTN networks. The resources associated
with each link of the slice is reserved and commissioned in the
underlying physical network upon the completion of configuring the
OTN slice and all the links are active.
An OTN slice can also be abstracted as an abstract topology when the
customer requests the slice to share resources between multiple
endpoints and to use the resources on demand. The abstract topology
may consist of virtual nodes and virtual links, whose associated
resources are reserved but not commissioned across the underlying OTN
networks. The customer can later commission resources within the
slice dynamically using the NBI provided by the service provider. An
OTN slice could use abstract topology to connect endpoints with
shared resources to optimize the resource utilization, and
connections can be activated within the slice as needed.
It is worth noting that those means to abstract an OTN slice are
similar to the Virtual Network (VN) abstraction defined for higher-
level interfaces in [RFC8453], in which context a connectivity-based
slice corresponds to Type 1 VN and a resource-based slice corresponds
to Type 2 VN, respectively.
A particular resource in an OTN network, such as a port or link, may
be sliced with one of the two granularity levels:
* Link-based slicing, in which a link and its associated link
termination points (LTPs) are dedicatedly allocated to a
particular OTN slice.
* Tributary-slot based slicing, in which multiple OTN slices share
the same link by allocating different OTN tributary slots in
different granularities.
Furthermore, an OTN switch is typically fully non-blockable switching
at the lowest ODU container granularity, it is desirable to specify
just the total number of ODU containers in the lowest granularity
(e.g. ODU0), when configuring tributary-slot based slicing on links
and ports internal to an OTN network. In multi-domain OTN network
scenarios where separate OTN slices are created on each of the OTN
networks and are stitched at inter-domain OTN links, it is necessary
to specify matching tributary slots at the endpoints of the inter-
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domain links. In some real network scenarios, OTN network resources
including tributary slots are managed explicitly by network operators
for network maintenance considerations. Therefore an OTN slice
controller shall support configuring an OTN slice with both options.
An OTN slice controller (OTN-SC) is a logical function responsible
for the life-cycle management of OTN slices instantiated within the
corresponding OTN network domains. The OTN-SC provides technology-
specific interfaces at its northbound (OTN-SC NBI) to allow a higher-
layer slice controller, such as an IETF network slice controller
(NSC) or an orchestrator, to request OTN slices with OTN-specific
requirements. The OTN-SC interfaces at the southbound using the
MDSC-to-PNC interface (MPI) with a Physical Network Controller (PNC)
or Multi-Domain Service Orchestrator (MDSC), as defined in the ACTN
control framework [RFC8453]. The logical function within the OTN-SC
is responsible for translating the OTN slice requests into concrete
slice realization which can be understood and provisioned at the
southbound by the PNC or MDSC.
The presence of OTN-SC provides multiple options for a high-level
slice controller or an orchestrator to configure and realize slicing
in OTN networks, depending on whether a customer's slice request is
technology agnostic or technology specific:
Option 1[opt.1]: An IETF NSC receives a technology-agnostic slice
request from the IETF NSC NBI and realizes full or part of the slice
in OTN networks directly through MPI provided by the PNC or MDSC.
The IETF NSC is responsible for mapping a technology-agnostic slicing
request into an OTN technology-specific realization. In this option,
the OTN-SC is not used.
Option 2[opt.2]: An IETF NSC receives a technology-agnostic slice
request from the IETF NSC NBI and delegates the request to the OTN-SC
through the OTN-SC NBI, which is OTN technology specific. The OTN-SC
in turn realizes the slice in single or multi domain OTN networks by
working with the underlying PNC or MDSC. In this option, the OTN-SC
is considered as a realization of IETF NSC, i.e., an NS realizer as
per [I-D.draft-contreras-teas-slice-controller-models], when the
underlying network is OTN. The OTN-SC is also a subordinate slice
controller of the IETF NSC, which is consistent with the hierarchical
control of slices defined by the IETF network slice framework.
Option 3[opt.3]: An OTN-aware orchestrator may request an OTN
technology-specific slice with OTN-specific SLOs through the OTN-SC
NBI to the OTN-SC. The OTN-SC in turn realizes the slice in single
or multi domain OTN networks by working with the underlying PNC or
MDSC
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An OTN slice may be realized by using standard MPI interfaces,
control plane, network management system (NMS) or any other
proprietary interfaces as needed. Examples of such interfaces
include the abstract TE topology [RFC8795], TE tunnel
[I-D.ietf-teas-yang-te],L1VPN[RFC4847], or Netconf/YANG based
interfaces such as OpenConfig. Some of these interfaces, such as the
TE tunnel model, are suitable for creating connectivity-based OTN
slices which represent a slice as a set of TE tunnels, while other
interfaces such as the TE topology model are more suitable for
creating resource-based OTN slices which represent a slice as a
topology.
The OTN-SC NBI is a technology-specific interface that augments the
IETF NSC NBI, which is technology- agnostic.
Figure 2 illustrates the OTN slicing control hierarchy , the
positioning of the OTN slicing interfaces as well as the options for
OTN slice configuration.
+--------------------+
| Provider's User |
+--------|-----------+
| CMI
+-----------------------+----------------------------+
| Orchestrator / E2E Slice Controller |
+------------+-----------------------------+---------+
| | NSC-NBI
| +---------------------+---------+
| | IETF Network Slice Controller |
| +-----+---------------+---------+
| opt.3 | opt.2 | opt.1
| OTN-SC NBI |OTN-SC NBI |
+------------+-------------+--------+ |
| OTN-SC | |
+--------------------------+--------+ |
| MPI | MPI
+--------------------------+---------------+---------+
| PNC |
+--------------------------+-------------------------+
| SBI
+-----------+----------+
|OTN Physical Network |
+----------------------+
Figure 2: Positioning of OTN Slicing Interfaces
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OTN-SC functionalities may be recursive such that a higher-level OTN-
SC may designate the creation of OTN slices to a lower-level OTN-SC
in a recursive manner. This scenario may apply to the creation of
OTN slices in multi-domain OTN networks, where multiple domain-wide
OTN slices provisioned by lower-layer OTN-SCs are stitched to support
a multi-domain OTN slice provisioned by the higher-level OTN-SC.
Alternatively, the OTN-SC may interface with an MDSC, which in turn
interfaces with multiple PNCs through the MPI to realize OTN slices
in multi-domain OTN networks without OTN-SC recursion. Figure 3
illustrates both options for OTN slicing in multi-domain.
+-------------------+ +-------------------+
| OTN-SC | | OTN-SC |
+--------|----------+ +---|----------|----+
|MPI |OTN-SC NBI|
+--------|----------+ +---|----+ +---|----+
| MDSC | | OTN-SC | | OTN-SC |
+---|----------|----+ +---|----+ +---|----+
|MPI |MPI |MPI |MPI
+---|----+ +---|----+ +---|----+ +---|----+
| PNC | | PNC | | PNC | | PNC |
+--------+ +--------+ +--------+ +--------+
Multi-domain Option 1 Multi-domain Option 2
Figure 3: OTN-SC for multi-domain
OTN-SC functionalities are logically independent and may be deployed
in different combinations to cater to the realization needs. In
reference with the ACTN control framework [RFC8453], an OTN-SC may be
deployed
* as an independent network function;
* together with a Physical Network Controller (PNC) for single-
domain or with a Multi-Domain Service Orchestrator (MDSC)for
multi-domain;
* together with a higher-level network slice controller to support
end-to-end network slicing;
4. YANG Data Model for OTN Slicing Configuration
4.1. OTN Slicing YANG Model for MPI
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4.1.1. MPI YANG Model Overview
For the configuration of connectivity-based OTN slices, existing
models such as the TE tunnel interface [I-D.ietf-teas-yang-te] may be
used and no addition is needed. This model is addressing the case
for configuring resource-based OTN slices, where the model permits to
reserve resources exploiting the common knowledge of an underlying
virtual topology between the OTN-SC and the subtended network
controller (MDSC or PNC). The slice is configured by marking
corresponding link resources on the TE topology received from the
underlying MDSC or PNC with a slice identifier and OTN-specific
resource requirements, e.g. the number of ODU time slots or the type/
number of ODU containers. The MDSC or PNC, based on the marked
resources by the OTN-SC, will update the underlying TE topology with
new TE link for each of the colored links to keep booked the reserved
OTN resources e.g. time slots or ODU containers.
4.1.2. MPI YANG Model Tree
module: ietf-otn-slice
augment /nw:networks/nw:network/nt:link/tet:te
/tet:te-link-attributes:
+--rw (otn-slice-granularity)?
+--:(link)
| +--rw slice-id? uint32
+--:(link-resource)
+--rw slices* [slice-id]
+--rw slice-id uint32
+--rw (technology)?
| +--:(otn)
| +--rw (slice-bandwidth)?
| +--:(containers)
| | +--rw odulist* [odu-type]
| | +--rw odu-type identityref
| | +--rw number? uint16
| +--:(time-slots)
| +--rw otn-ts-num? uint32
+--ro sliced-link-ref?
-> ../../../../../nt:link/link-id
Figure 4: OTN slicing tree diagram
4.1.3. MPI YANG Code
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<CODE BEGINS> file "ietf-otn-slice@2022-03-04.yang"
module ietf-otn-slice {
yang-version 1.1;
namespace "urn:ietf:params:xml:ns:yang:ietf-otn-slice";
prefix "otns";
import ietf-network {
prefix "nw";
reference
"RFC 8345: A YANG Data Model for Network Topologies";
}
import ietf-network-topology {
prefix "nt";
reference
"RFC 8345: A YANG Data Model for Network Topologies";
}
import ietf-te-topology {
prefix "tet";
reference
"RFC8795: YANG Data Model for Traffic Engineering
(TE) Topologies";
}
import ietf-otn-topology {
prefix "otnt";
reference
"I-D.ietf-ccamp-otn-topo-yang: A YANG Data Model
for Optical Transport Network Topology";
}
import ietf-layer1-types {
prefix "l1-types";
reference
"I-D.ietf-ccamp-layer1-types: A YANG Data Model
for Layer 1 Types";
}
organization
"IETF CCAMP Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/ccamp/>
WG List: <mailto:ccamp@ietf.org>
Editor: Haomian Zheng
<mailto:zhenghaomian@huawei.com>
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Editor: Italo Busi
<mailto:italo.busi@huawei.com>
Editor: Aihua Guo
<mailto:aihuaguo.ietf@gmail.com>
Editor: Victor Lopez
<mailto:victor.lopez@nokia.com>";
description
"This module defines a YANG data model for network slice
realization in Optical Transport Networks (OTN).
The model fully conforms to the Network Management Datastore
Architecture (NMDA).
Copyright (c) 2022 IETF Trust and the persons
identified as authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Simplified BSD
License set forth in Section 4.c of the IETF Trust's Legal
Provisions Relating to IETF Documents
(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 "2022-03-04" {
description
"Latest revision of MPI YANG model for OTN slicing.";
reference
"draft-ietf-ccamp-yang-otn-slicing-01: Framework and Data
Model for OTN Network Slicing";
}
/*
* Groupings
*/
grouping otn-link-slice-profile {
description
"Profile of an OTN link slice.";
choice otn-slice-granularity {
default "link";
description
"Link slice granularity.";
case link {
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leaf slice-id {
type uint32;
description
"Slice identifier";
}
}
case link-resource {
list slices {
key slice-id;
description
"List of slices.";
leaf slice-id {
type uint32;
description
"Slice identifier";
}
choice technology {
description
"Data plane technology types.";
case otn {
choice slice-bandwidth {
description
"Bandwidth specification for OTN slices.";
case containers {
uses l1-types:otn-link-bandwidth;
}
case time-slots {
leaf otn-ts-num {
type uint32;
description
"Number of OTN tributary slots allocated
for the slice.";
}
}
}
}
}
leaf sliced-link-ref {
type leafref {
path "../../../../../nt:link/nt:link-id";
}
config false;
description
"Relative reference to virtual links generated from
this TE link.";
}
}
}
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}
}
/*
* Augments
*/
augment "/nw:networks/nw:network/nt:link/tet:te/"
+ "tet:te-link-attributes" {
when "../../../nw:network-types/tet:te-topology/"
+ "otnt:otn-topology" {
description
"Augmentation parameters apply only for networks with
OTN topology type.";
}
description
"Augment OTN TE link attributes with slicing profile.";
uses otn-link-slice-profile;
}
}
<CODE ENDS>
Figure 5: OTN slicing YANG model
4.2. OTN Slicing YANG Model for OTN-SC NBI
4.2.1. NBI YANG Model Overview
The YANG model for OTN-SC NBI is OTN-technology specific, but shares
many common constructs and attributes with generic network slicing
YANG models. Furthermore, the OTN-SC NBI YANG is expected to support
both connectivity-based and resource-based slice configuration, which
is likely a common requirement for supporting slicing at other
transport network layers, e.g. WDM or MPLS(-TP). Therefore, the
OTN-SC NBI YANG model is designed into two models, a common base
model for transport network slicing, and an OTN slicing model which
augments the base model with OTN technology-specific constructs.
The base model defines a transport network slice (TNS) with the
following constructs and attributes:
* Common attributes, which include a set of common attributes like
slice identifier, name, description and names of customers who use
the slice.
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* Endpoints, which represent conceptual points of connection from a
customer device to the TNS. An endpoint is mapped to specific
physical or virtual resources of the customer and provider, and
such mapping is pre-negotiated and known to both the customer and
provider prior to the slice configuration. The mechanism for
endpoint negotiation is outside the scope of this draft.
* Network topology, which represent set of shared, reserved
resources organized as a virtual topology between all of the
endpoints. A customer could use such network topology to define
detailed connecvitiy path traversing the topology, and allow
sharing of resources between its multiple endpoint pairs.
* Connectivity matrix, which represent the intended virtual
connections between the endpoints within a TNS. A connctivity
matrix entry could be associated with an explicit path over the
above network topology.
* Service-level objectives (SLOs) associated with different objects,
including the TNS, node, link, termination point, and explicit
path, within a TNS.
4.2.2. NBI YANG Model Tree for Transport Network Slice
module: ietf-transport-network-slice
+--rw network-slices
+--rw network-slice* [ns-id]
+--rw ns-id string
+--rw ns-name? string
+--rw ns-description? string
+--rw customer-name* string
+--rw slo
| +--rw optimization-criterion? identityref
| +--rw delay-tolerance? boolean
| +--rw periodicity* uint64
| +--rw isolation-level? identityref
+--rw endpoints
| +--rw endpoint* [endpoint-id]
| +--rw endpoint-id string
+--rw network-topologies
| +--rw network-topology* [topology-id]
| +--rw topology-id string
| +--rw node* [node-id]
| | +--rw node-id inet:uri
| | +--rw slo
| | | +--rw isolation-level? identityref
| | +--rw termination-point* [tp-id]
| | +--rw tp-id inet:uri
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| | +--rw endpoint-id? leafref
| +--rw link* [link-id]
| +--rw link-id inet:uri
| +--rw slo
| | +--rw delay-tolerance? boolean
| | +--rw periodicity* uint64
| | +--rw isolation-level? identityref
| +--rw source
| | +--rw source-node? -> ../../../node/node-id
| | +--rw source-tp? leafref
| +--rw destination
| +--rw dest-node? -> ../../../node/node-id
| +--rw dest-tp? leafref
+--rw connectivity-matrices
+--rw connectivity-matrix* [connectivity-matrix-id]
+--rw connectivity-matrix-id uint32
+--rw topology-id? leafref
+--rw src-endpoint?
| -> ../../../endpoints/endpoint/endpoint-id
+--rw dst-endpoint?
| -> ../../../endpoints/endpoint/endpoint-id
+--rw slo
+--rw explicit-path* [tp-id]
+--rw tp-id leafref
Figure 6: Tree diagram for transport network slice
4.2.3. NBI YANG Code for Transport Network Slice
<CODE BEGINS> file "ietf-transport-network-slice@2022-03-04.yang"
module ietf-transport-network-slice {
yang-version 1.1;
namespace
"urn:ietf:params:xml:ns:yang:ietf-transport-network-slice";
prefix "tns";
import ietf-inet-types {
prefix inet;
reference
"RFC 6991: Common YANG Data Types";
}
import ietf-te-types {
prefix "te-types";
reference
"RFC 8776: Traffic Engineering Common YANG Types";
}
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organization
"IETF CCAMP Working Group";
contact
"WG Web: <http://tools.ietf.org/wg/ccamp/>
WG List: <mailto:ccamp@ietf.org>
Editor: Haomian Zheng
<mailto:zhenghaomian@huawei.com>
Editor: Italo Busi
<mailto:italo.busi@huawei.com>
Editor: Aihua Guo
<mailto:aihuaguo.ietf@gmail.com>
Editor: Victor Lopez
<mailto:victor.lopez@nokia.com>";
description
"This module defines a base YANG data model for configuring
generic network slices in optical transport networks, e.g.,
Optical Transport Network (OTN).
The model fully conforms to the Network Management Datastore
Architecture (NMDA).
Copyright (c) 2022 IETF Trust and the persons
identified as authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Simplified BSD
License set forth in Section 4.c of the IETF Trust's Legal
Provisions Relating to IETF Documents
(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 "2022-03-04" {
description
"Latest revision of NBI YANG model for OTN slicing.";
reference
"draft-ietf-ccamp-yang-otn-slicing-01: Framework and Data
Model for OTN Network Slicing";
}
/*
* Identities
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*/
identity isolation-level {
description
"Base identity for the isolation-level.";
reference
"GSMA-NS-Template: Generic Network Slice Template,
Version 3.0.";
}
identity no-isolation {
base isolation-level;
description
"Network slices are not separated.";
}
identity physical-isolation {
base isolation-level;
description
"Network slices are physically separated (e.g. different
rack, different hardware, different location, etc.).";
}
identity logical-isolation {
base isolation-level;
description
"Network slices are logically separated.";
}
identity process-isolation {
base physical-isolation;
description
"Process and threads isolation.";
}
identity physical-memory-isolation {
base physical-isolation;
description
"Process and threads isolation.";
}
identity physical-network-isolation {
base physical-isolation;
description
"Process and threads isolation.";
}
identity virtual-resource-isolation {
base logical-isolation;
description
"A network slice has access to specific range of resources
that do not overlap with other network slices
(e.g. VM isolation).";
}
identity network-functions-isolation {
base logical-isolation;
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description
"NF (Network Function) is dedicated to the network slice,
but virtual resources are shared.";
}
identity service-isolation {
base logical-isolation;
description
"NSC data are isolated from other NSCs, but virtual
resources and NFs are shared.";
}
/*
* Groupings
*/
grouping ns-generic-info {
description
"Generic configuration of a network slice";
leaf ns-name {
type string;
description
"Name of the specific network slice";
}
leaf ns-description {
type string;
description
"Description regarding the specific network slice";
}
leaf-list customer-name {
type string;
description
"List of customers using the slice";
}
}
grouping ns-slo {
description
"SLO configuration of a network slice";
container slo {
description
"SLO configuration of a network slice";
leaf optimization-criterion {
type identityref {
base te-types:objective-function-type;
}
description
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"Optimization criterion applied to this topology.";
}
leaf delay-tolerance {
type boolean;
description
"'true' if is not too critical how long it takes to
deliver the amount of data.";
reference
"GSMA-NS-Template: Generic Network Slice Template,
Version 3.0.";
}
leaf-list periodicity {
type uint64;
units seconds;
description
"A list of periodicities supported by the network
slice.";
reference
"GSMA-NS-Template: Generic Network Slice Template,
Version 3.0.";
}
leaf isolation-level {
type identityref {
base isolation-level;
}
description
"A network slice instance may be fully or partly,
logically and/or physically, isolated from another
network slice instance. This attribute describes
different types of isolation:";
}
}
}
grouping node-slo {
description
"Node SLO";
container slo {
description
"SLO configuration of a node";
leaf isolation-level {
type identityref {
base isolation-level;
}
description
"A network slice instance may be fully or partly,
logically and/or physically, isolated from another
network slice instance. This attribute describes
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different types of isolation:";
}
}
}
grouping link-slo {
description
"Link SLO";
container slo {
description
"SLO configuration of a link";
leaf delay-tolerance {
type boolean;
description
"'true' if is not too critical how long it takes to
deliver the amount of data.";
reference
"GSMA-NS-Template: Generic Network Slice Template,
Version 3.0.";
}
leaf-list periodicity {
type uint64;
units seconds;
description
"A list of periodicities supported by the network
slice.";
reference
"GSMA-NS-Template: Generic Network Slice Template,
Version 3.0.";
}
leaf isolation-level {
type identityref {
base isolation-level;
}
description
"A network slice instance may be fully or partly,
logically and/or physically, isolated from another
network slice instance. This attribute describes
different types of isolation:";
}
}
}
grouping connectivity-matrix-slo {
description
"SLO configuration of a path within a network slice";
container slo {
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description
"Path SLO configuration";
}
leaf delay-tolerance {
type boolean;
description
"'true' if is not too critical how long it takes to
deliver the amount of data.";
reference
"GSMA-NS-Template: Generic Network Slice Template,
Version 3.0.";
}
leaf-list periodicity {
type uint64;
units seconds;
description
"A list of periodicities supported by the network
slice.";
reference
"GSMA-NS-Template: Generic Network Slice Template,
Version 3.0.";
}
leaf isolation-level {
type identityref {
base isolation-level;
}
description
"A network slice instance may be fully or partly,
logically and/or physically, isolated from another
network slice instance. This attribute describes
different types of isolation:";
}
}
grouping connectivity-matrix-entry-slo {
description
"SLO configuration of a connectivity matrix entry within a
network slice";
container slo {
description
"SLO configuration of a connectivity matrix entry";
}
}
grouping explicit-path {
description
"Explicit path for a connectivity matrix entry";
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list explicit-path {
key "tp-id";
description
"List of TPs within a network topology that form a
path.";
leaf tp-id {
type leafref {
path "/network-slices/network-slice[ns-id=current()"+
"/../../../../ns-id]/network-topologies"+
"/network-topology[topology-id=current()"+
"/../../topology-id]/node/termination-point"+
"/tp-id";
}
description
"Relative reference to TP id.";
}
}
}
grouping network-topology-def {
description
"Network topology definition";
list node {
key "node-id";
description
"The inventory of nodes of this topology.";
leaf node-id {
type inet:uri;
description
"Node identifier.";
}
uses node-slo;
list termination-point {
key "tp-id";
description
"TP identifier";
leaf tp-id {
type inet:uri;
description
"Termination point identifier.";
}
leaf endpoint-id {
type leafref {
path "/network-slices/network-slice[ns-id=current()"+
"/../../../../../ns-id]/endpoints/endpoint/"+
"endpoint-id";
}
description
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"Relative reference to TP id.";
}
}
}
list link {
key "link-id";
description
"Link identifier.";
leaf link-id {
type inet:uri;
description
"Link identifier.";
}
uses link-slo;
container source {
description
"Link source node";
leaf source-node {
type leafref {
path "../../../node/node-id";
}
description
"Source node identifier, must be in same topology.";
}
leaf source-tp {
type leafref {
path "../../../node[node-id=current()/../"+
"source-node]/termination-point/tp-id";
}
description
"Termination point within source node that terminates
the link.";
}
}
container destination {
description
"Link destination node";
leaf dest-node {
type leafref {
path "../../../node/node-id";
}
description
"Destination node identifier, must be in same
topology.";
}
leaf dest-tp {
type leafref {
path "../../../node[node-id=current()/../"+
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"dest-node]/termination-point/tp-id";
}
description
"Termination point within destination node that
terminates the link.";
}
}
}
}
/*
* Configuration data nodes
*/
container network-slices {
description
"Generic network slice configurations";
list network-slice {
key "ns-id";
description
"Network slice identifier";
leaf ns-id {
type string;
description
"A unique network slice identifier across a slice
controller";
}
uses ns-generic-info;
uses ns-slo;
container endpoints {
description
"Endpoints of a network slice";
list endpoint {
key "endpoint-id";
description
"List of endpoints";
leaf endpoint-id {
type string;
description
"Endpoint identifier";
}
}
}
container network-topologies {
description
"A network slice is described as a network topology";
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list network-topology {
key "topology-id";
description
"List of network topologies";
leaf topology-id {
type string;
description
"Topology identifier";
}
uses network-topology-def;
}
}
container connectivity-matrices {
description
"Connectivity matrices";
list connectivity-matrix {
key "connectivity-matrix-id";
description
"List of connectivity matrix entities";
leaf connectivity-matrix-id {
type uint32;
description
"Connectivity matrix identifier";
}
leaf topology-id {
type leafref {
path "../../../network-topologies/network-topology"+
"/topology-id";
}
description
"Relative reference to network topology id.";
}
leaf src-endpoint {
type leafref {
path "../../../endpoints/endpoint/endpoint-id";
}
description
"Relative reference to endpoint id.";
}
leaf dst-endpoint {
type leafref {
path "../../../endpoints/endpoint/endpoint-id";
}
description
"Relative reference to endpoint id.";
}
uses connectivity-matrix-entry-slo;
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uses explicit-path;
} //connectivity-matrix
} //connectivity-matrices
} //network-slice
} //network slices
}
<CODE ENDS>
Figure 7: YANG model for transport network slice
4.2.4. NBI YANG Model Tree for OTN slice
TBD.
4.2.5. NBI YANG Code for OTN Slice
TBD.
5. Manageability Considerations
To ensure the security and controllability of physical resource
isolation, slice-based independent operation and management are
required to achieve management isolation. Each optical slice
typically requires dedicated accounts, permissions, and resources for
independent access and O&M. This mechanism is to guarantee the
information isolation among slice tenants and to avoid resource
conflicts. The access to slice management functions will only be
permitted after successful security checks.
6. Security Considerations
The YANG module specified in this document defines a schema for data
that is designed to be accessed via network management protocols such
as NETCONF [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 or RESTCONF users to a
preconfigured subset of all available NETCONF or RESTCONF protocol
operations and content.
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)
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to these data nodes without proper protection can have a negative
effect on network operations. Considerations in Section 8 of
[RFC8795] are also applicable to their subtrees in the module defined
in this document.
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. Considerations in Section 8 of
[RFC8795] are also applicable to their subtrees in the module defined
in this document.
7. IANA Considerations
It is proposed to IANA to assign new URIs from the "IETF XML
Registry" [RFC3688] as follows:
URI: urn:ietf:params:xml:ns:yang:ietf-transport-network-slice
Registrant Contact: The IESG
XML: N/A; the requested URI is an XML namespace.
URI: urn:ietf:params:xml:ns:yang:ietf-otn-slice
Registrant Contact: The IESG
XML: N/A; the requested URI is an XML namespace.
This document registers a YANG module in the YANG Module Names
registry [RFC6020].
name: ietf-transport-network-slice
namespace: urn:ietf:params:xml:ns:yang:ietf-transport-network-slice
prefix: tns
reference: RFC XXXX
name: ietf-otn-slice
namespace: urn:ietf:params:xml:ns:yang:ietf-otn-slice
prefix: otnslice
reference: RFC XXXX
8. Normative References
[GSMA-NS-Template]
GSMA Association, "Generic Network Slice Template, Version
5.0", NG.116 , June 2021, <https://www.gsma.com/newsroom/
wp-content/uploads//NG.116-v5.0-7.pdf>.
[I-D.draft-contreras-teas-slice-controller-models]
Contreras, L. M., Rokui, R., Tantsura, J., Wu, B., Liu,
X., Dhody, D., and S. Belloti, "IETF Network Slice
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Controller and its associated data models", Work in
Progress, Internet-Draft, draft-contreras-teas-slice-
controller-models-01, 22 February 2021,
<https://www.ietf.org/archive/id/draft-contreras-teas-
slice-controller-models-01.txt>.
[I-D.ietf-ccamp-layer1-types]
Zheng, H. and I. Busi, "A YANG Data Model for Layer 1
Types", Work in Progress, Internet-Draft, draft-ietf-
ccamp-layer1-types-11, 7 September 2021,
<https://www.ietf.org/archive/id/draft-ietf-ccamp-layer1-
types-11.txt>.
[I-D.ietf-ccamp-otn-topo-yang]
Zheng, H., Busi, I., Liu, X., Belotti, S., and O. G. D.
Dios, "A YANG Data Model for Optical Transport Network
Topology", Work in Progress, Internet-Draft, draft-ietf-
ccamp-otn-topo-yang-13, 12 July 2021,
<https://www.ietf.org/archive/id/draft-ietf-ccamp-otn-
topo-yang-13.txt>.
[I-D.ietf-teas-ietf-network-slices]
Farrel, A., Gray, E., Drake, J., Rokui, R., Homma, S.,
Makhijani, K., Contreras, L. M., and J. Tantsura,
"Framework for IETF Network Slices", Work in Progress,
Internet-Draft, draft-ietf-teas-ietf-network-slices-06, 3
March 2022, <https://www.ietf.org/archive/id/draft-ietf-
teas-ietf-network-slices-06.txt>.
[I-D.ietf-teas-yang-te]
Saad, T., Gandhi, R., Liu, X., Beeram, V. P., Bryskin, I.,
and O. G. D. Dios, "A YANG Data Model for Traffic
Engineering Tunnels, Label Switched Paths and Interfaces",
Work in Progress, Internet-Draft, draft-ietf-teas-yang-te-
29, 7 February 2022, <https://www.ietf.org/archive/id/
draft-ietf-teas-yang-te-29.txt>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
DOI 10.17487/RFC3688, January 2004,
<https://www.rfc-editor.org/info/rfc3688>.
Guo, et al. Expires 6 September 2022 [Page 31]
Internet-Draft Framework and YANG of OTN Slices March 2022
[RFC4847] Takeda, T., Ed., "Framework and Requirements for Layer 1
Virtual Private Networks", RFC 4847, DOI 10.17487/RFC4847,
April 2007, <https://www.rfc-editor.org/info/rfc4847>.
[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>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration
Access Control Model", STD 91, RFC 8341,
DOI 10.17487/RFC8341, March 2018,
<https://www.rfc-editor.org/info/rfc8341>.
[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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[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>.
[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>.
[TS.28.530-3GPP]
3rd Generation Partnership Project (3GPP), "3GPP TS 28.530
V15.1.0 Technical Specification Group Services and System
Aspects; Management and orchestration; Concepts, use cases
and requirements (Release 15)", 3GPP TS 28.530 , December
2018, <http://ftp.3gpp.org//Specs/
archive/28_series/28.530/28530-f10.zip>.
Acknowledgments
This document was prepared using kramdown.
Previous versions of this document were prepared using 2-Word-
v2.0.template.dot.
The authors would like to thank Adrian Farrel, Danielle Ceccarelli,
Igor Bryskin, Bo Wu, Gyan Mishra, Joel M. Halpen, Dhruv Dhoddy and
Loa Andersson for providing valuable insights.
Contributors
Haomian Zheng
Huawei Technologies
H1, Xiliu Beipo Village, Songshan Lake
Dongguan
China
Email: zhenghaomian@huawei.com
Italo Busi
Huawei Technologies
Email: italo.busi@huawei.com
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Oscar Gonzalez de Dios
Telefonica
Email: oscar.gonzalezdedios@telefonica.com
Victor Lopez
Nokia
Email: victor.lopez@nokia.com
Dieter Beller
Nokia
Email: Dieter.Beller@nokia.com
Henry Yu
Huawei Technologies Canada
Email: henry.yu@huawei.com
Jiang Sun
China Mobile
Email: sunjiang@chinamobile.com
Authors' Addresses
Aihua Guo
Futurewei Technologies
Email: aihuaguo.ietf@gmail.com
Luis M. Contreras
Telefonica
Email: luismiguel.contrerasmurillo@telefonica.com
Sergio Belotti
Nokia
Email: Sergio.belotti@nokia.com
Reza Rokui
Ciena
Email: rrokui@ciena.com
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Yunbin Xu
CAICT
Email: xuyunbin@caict.ca.cn
Yang Zhao
China Mobile
Email: zhaoyangyjy@chinamobile.com
Xufeng Liu
IBM Corporation
Email: xufeng.liu.ietf@gmail.com
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