Traffic Engineering Architecture and Signaling M. Boucadair
Internet-Draft Orange
Intended status: Informational 12 June 2023
Expires: 14 December 2023
An Overview of IETF Network Slicing Efforts
draft-boucadair-teas-ietf-slicing-overview-01
Abstract
This document lists a set of slicing-related specifications that are
being development within the IETF. This document is meant to provide
an overview of slicing activities in the IETF to hopefully ease
coordination and ensure that specifications that are developed in
many WGs are consistent.
Discussion Venues
This note is to be removed before publishing as an RFC.
Discussion of this document takes place on the Traffic Engineering
Architecture and Signaling Working Group mailing list
(teas@ietf.org), which is archived at
https://mailarchive.ietf.org/arch/browse/teas/.
Source for this draft and an issue tracker can be found at
https://github.com/boucadair/ietf-slice-overview.
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
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on 14 December 2023.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Reference Framework and Architecture . . . . . . . . . . . . 4
3. Models for Realizing Network Slices . . . . . . . . . . . . . 5
3.1. Using Current IP/MPLS Technologies . . . . . . . . . . . 5
3.2. Using Network Resource Partitions and Slice-Flow
Aggregates . . . . . . . . . . . . . . . . . . . . . . . 5
3.3. Optical Transport Networks (OTN) Slicing . . . . . . . . 6
3.4. VPN+ . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.5. Instantiation in Service Providers Networks . . . . . . . 6
3.6. Structuring Network Slice Controllers . . . . . . . . . . 6
3.7. SR-based Hierarchical Network Slices . . . . . . . . . . 7
3.8. Realization of Composite Network Slices . . . . . . . . . 7
4. Applicability and Mapping Scenarios . . . . . . . . . . . . . 7
4.1. 3GPP 5G End-to-End Network Slices . . . . . . . . . . . . 7
4.2. Abstraction and Control of Traffic Engineered Networks
(ACTN) . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.3. Mobility-Aware Transport Network Slicing . . . . . . . . 7
4.4. DetNet . . . . . . . . . . . . . . . . . . . . . . . . . 8
5. Orchestration and Data Models . . . . . . . . . . . . . . . . 8
5.1. Common Models . . . . . . . . . . . . . . . . . . . . . . 9
5.2. Service Models . . . . . . . . . . . . . . . . . . . . . 10
5.2.1. Attachment Circuit as a Service (ACaaS) Data Model . 10
5.2.2. Network Slice Service Data Model . . . . . . . . . . 10
5.3. Network Models . . . . . . . . . . . . . . . . . . . . . 10
5.3.1. Service Attachment Points (SAPs) . . . . . . . . . . 10
5.3.2. AC-augmented SAPs . . . . . . . . . . . . . . . . . . 10
5.3.3. Network Slice Topology . . . . . . . . . . . . . . . 10
5.3.4. NRP . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3.5. Network Slice Mapping . . . . . . . . . . . . . . . . 11
6. Control Plane Extensions . . . . . . . . . . . . . . . . . . 11
6.1. BGP Classful Transport Planes . . . . . . . . . . . . . . 11
6.2. NRP . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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6.2.1. BGP Flowspec . . . . . . . . . . . . . . . . . . . . 11
6.2.2. BGP-LS Filters in SR . . . . . . . . . . . . . . . . 11
6.2.3. SR Policies Extensions . . . . . . . . . . . . . . . 12
6.2.4. PCEP Extensions . . . . . . . . . . . . . . . . . . . 12
6.3. Virtual Transport Networks (VTNs) . . . . . . . . . . . . 12
6.3.1. IS-IS MT . . . . . . . . . . . . . . . . . . . . . . 12
6.3.2. BGP-LS . . . . . . . . . . . . . . . . . . . . . . . 12
7. Data Plane Extensions . . . . . . . . . . . . . . . . . . . . 12
7.1. Slice Identifier in the MPLS Entropy Label . . . . . . . 12
7.2. Slice Identifier in IPv6 Flow Label . . . . . . . . . . . 12
7.3. Slice Identifier in the Source Address of Encapsulated
SRH . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.4. VTN Resource ID in an IPv6 Extension Header . . . . . . . 13
7.5. NRP . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.5.1. Resource-aware Segments . . . . . . . . . . . . . . . 13
7.5.2. NRP ID in SRv6 . . . . . . . . . . . . . . . . . . . 13
7.5.3. NRP Selector in MPLS Network Actions . . . . . . . . 13
8. OAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8.1. LSP Ping/Traceroute Extensions . . . . . . . . . . . . . 14
8.2. Precision Availability Metrics for SLO-Governed End-to-End
Services . . . . . . . . . . . . . . . . . . . . . . . . 14
9. Misc . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
9.1. Scalability Considerations for NRP . . . . . . . . . . . 14
10. Security Considerations . . . . . . . . . . . . . . . . . . . 14
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
12. Informative References . . . . . . . . . . . . . . . . . . . 14
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 22
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 22
1. Introduction
Various slicing efforts are being conduced within various IETF WGs
(e.g., teas, idr, spring, ccamp, mpls, opsawg, 6man, and ippm) and
areas (e.g., rtg, int, tsv, and ops). All these efforts are
referring to the IETF framework that is developed by the teas WG
(Section 2), however there is a lack of a global visibility about
these efforts and their interdependency.
Also, there is a lack of cross-WG communications in some cases when a
slicing-related specification is candidate for adoption or adopted by
a WG. This lack of global view at the IETF level and lack of early
cross-WG communications may induce some inconsistency. For example,
some proposals argue in favor of specifying extensions to convey
specific identifiers in packets. However, distinct identifiers are
being proposed: slice identifier, NRP Selector, NRP identifier, VTN
identifier, VTN resource identifier, etc. The need and relationship
between these identifiers are worth to be discussed independent of
the channels that are used to convey these identifiers.
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This document provides an overview of slicing activities in the IETF
to hopefully ease coordination and ensure that specifications that
are developed in many WGs are consistent, e.g.:
* Position the various concepts: network slice, network resource
partition, virtual transport network, etc.
* Clarify the need of the various identifiers introduced so far and
soften redundant/duplicate uses.
* Harmonize the definition of relevant identifiers (length,
encoding, usage, etc.) rather than having the specification of the
same identifier repeated in many places. For example, current
specifications use distinct encoding length of the same attribute
(variable, 16-bit, 32-bit).
* Clarify the relationship and co-existence of identifiers if more
than one is needed.
Future versions of this document many include recommendations.
2. Reference Framework and Architecture
[I-D.ietf-teas-ietf-network-slices] is the authoritative IETF
framework for Network Slices. It provides definitions for a slice-
related core terms and specifies a framework for the provision of
Network Slice services over networks that are deployed using
technologies that are owned by the IETF (IP, MPLS, etc.). The
document refers to such slices as IETF Network Slice.
[I-D.ietf-teas-ietf-network-slices] provides a clear distinction
between:
* the "IETF Network Slice service" which is the service delivered to
the customer and which is agnostic to the technologies and
mechanisms used by the service provider, and
* the "IETF Network Slice" which is the realization of the service
in the service provider's network achieved by partitioning network
resources and by applying a set of mechanisms within the network.
The IETF Network Slice service is specified in terms of:
* a set of Service Demarcation Point (SDP),
* a set of one or more connectivity constructs between subsets of
these SDPs, and
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* a set of service objectives for each SDP sending to each
connectivity construct.
The service objectives can be expressed as Service Level Objectives
(SLOs) or Service Level Expectations (SLEs).
In some deploymenets, the underlying network can be customized to
select a subset of resources that are suitable for the delivery of an
IETF Network Slice service. Such a customization can be achieved by
creating a set of Network Resource Partitions (NRPs).
In other deployments, IETF Network Slices can be hosted directly on
the underlay network (i.e., without requiring any NRP).
IETF Network Slices can be realized using existing tools
(Section 3.1). The extensions listed in Section 6 or Section 7 are
not required in such a case.
[I-D.ietf-teas-ietf-network-slices] does not provide any
recommendation about the technological means to realize an IETF
Network Slice service. These considerations are deployment specific.
3. Models for Realizing Network Slices
3.1. Using Current IP/MPLS Technologies
[I-D.srld-teas-5g-slicing] describes a model for the realization of
IETF Network Slices for 5G networks. This realization model reuses
many building blocks that are commonly used in service provider
networks, specifically:
* L2VPN/L3VPN service instances for logical separation,
* Fine-grained resource control at the PE,
* Coarse resource control at the transit, and
* Capacity planning/management for efficient usage of provider
network resources.
3.2. Using Network Resource Partitions and Slice-Flow Aggregates
[I-D.ietf-teas-ns-ip-mpls] proposes a model that is inspired from the
Diffserv model for the realization of Network Slices over IP/MPLS
networks. Specifically, this model introduces the concept of Slice-
Flow Aggregate which is defined as a collection of packets that are
mapped to an NRP and are given the same forwarding treatment in a
shared network. An aggregate can group flows from of one or more
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IETF Network Slice services.
[I-D.ietf-teas-ns-ip-mpls] also introduces the notion of NRP Policy
that is used to trigger the creation of NRPs that will support a
given Slice-Flow Aggregate. In some deployment schemes, packets that
belong to a Slice-Flow Aggregate are forwarded by intermediate node
along the appropriate NRP by processing an NRP Selector that is
carried by these packets.
3.3. Optical Transport Networks (OTN) Slicing
[I-D.ietf-ccamp-yang-otn-slicing] defines Optical Transport Networks
(OTN) slice as an OTN virtual network topology connecting a number of
OTN endpoints using a set of shared or dedicated OTN network
resources to satisfy specific SLOs. OTN slices are considered as a
technology-specific realization of an IETF Network Slice in the OTN
domain.
3.4. VPN+
[I-D.ietf-teas-enhanced-vpn] describes a framework for providing
enhanced VPN services based upon VPN and Traffic Engineering (TE)
technologies. Enhanced VPN (VPN+) can be used for the realization of
IETF network slices. This document introduces the concept of Virtual
Transport Network (VTN), which is a virtual underlay network
consisting of a subset of network resources allocated from the
physical underlay network, and is associated with a customized
network topology.
3.5. Instantiation in Service Providers Networks
[I-D.barguil-teas-network-slices-instantation] focuses on the
instantiation of the IETF Network Slice services in service provider
networks using available data models. In particular, this document
describes the relationship between service models for managing the
IETF Network Slice services and Network Models (e.g., the Layer-3
Network Model (L3NPM, [RFC9182]), the Layer-2 Network Model (L2NM
[RFC9291])) used for the realization of the slices.
3.6. Structuring Network Slice Controllers
[I-D.contreras-teas-slice-controller-models] proposes an approach for
structuring the IETF Network Slice Controller as well as how to use
different data models being defined for IETF Network Slice Service
provision.
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3.7. SR-based Hierarchical Network Slices
[I-D.gong-teas-hierarchical-slice-solution] proposes a hierarchical
approach for realizing IETF Network Slices in Segment Routing domain.
The approach involves two levels:
* Level 1 Network Slices are realized using Flex-Algo.
* Level 2 forwarding paths are restricted in the Level 1 topology by
using SR Policy and NRP-ID in the data plane.
3.8. Realization of Composite Network Slices
[I-D.li-teas-composite-network-slices] investigates a set of
scenarios for realizing composite IETF Network Slices (that basically
involve other slices). The document defines a new identifier, called
Inter-Domain Network Resource Partition Identifier (Inter-domain NRP
ID).
4. Applicability and Mapping Scenarios
4.1. 3GPP 5G End-to-End Network Slices
[I-D.ietf-teas-5g-network-slice-application] focuses on the
application of IETF Network Slices in the context of the 3GPP 5G
slices.
4.2. Abstraction and Control of Traffic Engineered Networks (ACTN)
[I-D.ietf-teas-applicability-actn-slicing] describes the
applicability of ACTN to Network Slicing.
4.3. Mobility-Aware Transport Network Slicing
[I-D.ietf-dmm-tn-aware-mobility] discusses a mapping of 5G slices to
IETF Network Slices when the transport network is separated from the
networks in which the 5G network functions are deployed (e.g., 5G
functions distributed across data centers). This document zooms into
the use of UDP source port number in GTP-U outer header and LAN to
map between a 5G slice and corresponding IETF Network Slice segments
that is listed in [I-D.ietf-teas-5g-network-slice-application].
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4.4. DetNet
[I-D.sw-detnet-network-slice-mapping-yang] describes the
applicability of DetNet to IETF Network Slice, particularly to
provide deterministic services. The document describes how to use
DetNet flow aggregation as the Slice-Flow Aggregates over an
underlying NRP following the approach in Section 3.2.
5. Orchestration and Data Models
Figure 1 provides an example of the various data models that can be
invoked in the context of Network Slicing.
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+---------------+
| Customer |
+-------+-------+
Customer Service Model |
e.g., slice-svc, ac-svc,| and bearer-svc
+-------+-------+
| Service |
| Orchestration |
+-------+-------+
Network Model |
e.g., l2vpn-ntw, l3vpn-ntw, sap, and | ac-ntw
+-------+-------+
| Network |
| Orchestration |
+-------+-------+
Network Configuration Model |
+-----------+-----------+
| |
+--------+------+ +--------+------+
| Domain | | Domain |
| Orchestration | | Orchestration |
+---+-----------+ +--------+------+
Device | | |
Configuration | | |
Model | | |
+----+----+ | |
| Config | | |
| Manager | | |
+----+----+ | |
| | |
| NETCONF/CLI..................
| | |
+--------------------------------+
+----+ Bearer | | Bearer +----+
|CE#1+--------+ Network +--------+CE#2|
+----+ AC | | AC +----+
+--------------------------------+
Site A Site B
Figure 1: Overview of Data Models used for Network Slicing
5.1. Common Models
[RFC9181] specifies a set of reusable types and groupings to manage
VPN services. Note that VPNs are used for the realization of Network
Slices.
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[I-D.boro-opsawg-teas-common-ac] specifies a set of reusable types
and groupings to manage Attachment Circuits (ACs).
5.2. Service Models
5.2.1. Attachment Circuit as a Service (ACaaS) Data Model
[I-D.boro-opsawg-teas-attachment-circuit] specifies YANG data models
for managing 'Attachment Circuits'-as-a-Service (ACaaS) and also
bearers. These ACs and bearers are used to identify where to deliver
a slice service.
5.2.2. Network Slice Service Data Model
[I-D.ietf-teas-ietf-network-slice-nbi-yang] defines a YANG data model
for manaing IETF Network Slice Services.
5.3. Network Models
5.3.1. Service Attachment Points (SAPs)
[I-D.ietf-opsawg-sap] defines a YANG data model for representing an
abstract view of the provider network topology that contains the
points from which its services can be attached (e.g., basic
connectivity, VPN, network slices). Also, the model can be used to
retrieve the points where the services are actually being delivered
to customers (including peer networks).
A SAP network topology can be used for one or multiple service types
('service-type'). Setting this data node to 'network-slice' allows a
controller to expose where IETF Network Slices services are being
delivered. It can also be used to check where IETF Network Slice
services can be delivered.
5.3.2. AC-augmented SAPs
[I-D.boro-opsawg-ntw-attachment-circuit] augments the SAP model with
more details for managing ACs at the network level.
5.3.3. Network Slice Topology
[I-D.liu-teas-transport-network-slice-yang] specifies a YANG model
for IETF Network Slice Topology.
The need for such a model is yet to be justified as the current scope
is redundant with what can be already achieved using the SAP model
(Section 5.3.1).
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5.3.4. NRP
[I-D.wdbsp-teas-nrp-yang] specifies a YANG data model for managing
NRPs.
5.3.5. Network Slice Mapping
[I-D.dhody-teas-ietf-network-slice-mapping] specifies an IETF Network
Slice Service mapping YANG model. The model supports the following
mappings:
* L3NM [RFC9182]
* L2NM [RFC9291]
* TE [I-D.ietf-teas-te-service-mapping-yang]
* NRP
6. Control Plane Extensions
6.1. BGP Classful Transport Planes
[I-D.ietf-idr-bgp-ct] specifies mechanisms for classifying underlay
routes into a set of classes, called transport classes, and mapping
service-specific routes to a specific transport class. For example,
[I-D.ietf-idr-bgp-ct] can be used to create a customized topology for
Network Slices. These topologies (transport classes) will be
typically created to satisfy certain TE characteristics. A new
Transport Class Route Target extended community is defined for this
purpose. A transport class is identified by a 4-octet identifier:
Transport Class ID.
6.2. NRP
6.2.1. BGP Flowspec
[I-D.ietf-idr-flowspec-network-slice-ts] specifies a BGP Flowspec
extension for NRP traffic steering.
6.2.2. BGP-LS Filters in SR
[I-D.drake-teas-bgp-ls-filter-nrp] specifies new BGP-LS attributes,
called BGP-LS Filters, for NRPs in SR networks. A BGP-LS Filter
provides a description of a subset of the links and nodes in an
underlay network. Ingress PE selects a path to an egress PE from the
topology defined by the BGP-LS Filters it has imported for a given
VPN.
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6.2.3. SR Policies Extensions
6.2.3.1. BGP
[I-D.dong-idr-sr-policy-nrp] and [I-D.liu-idr-bgp-network-slicing]
define extensions to BGP in order to advertise NRP ID in an SR
Policy. The NRP ID is encoded in 4 octets.
6.2.3.2. BGP-LS
[I-D.chen-idr-bgp-ls-sr-policy-nrp] specifies SR Policy extensions
for NRP in BGP-LS. The NRP ID is encoded in 4 octets.
6.2.4. PCEP Extensions
[I-D.dong-pce-pcep-nrp] specifie Path Computation Element
Communication Protocol (PCEP) extensions for NRP. The NRP ID is
encoded in 4 octets.
6.3. Virtual Transport Networks (VTNs)
6.3.1. IS-IS MT
[I-D.ietf-lsr-isis-sr-vtn-mt] specifies how to use IS-IS Multi-
Topology (MT) for SR-based VTNs.
6.3.2. BGP-LS
[I-D.ietf-idr-bgpls-sr-vtn-mt] describes a mechanism to distribute
the information of SR-based VTNs to the network controller using BGP-
LS with Multi-Topology.
7. Data Plane Extensions
7.1. Slice Identifier in the MPLS Entropy Label
[I-D.decraene-mpls-slid-encoded-entropy-label-id] proposes an
approach to encode slice identifiers in a portion of the MPLS Entropy
Label (EL). The number of bits to be used for encoding the slice
identifier in the EL is policy-based. Transit LSRs uses the slice
identifier in the EL to apply per-slice policies.
7.2. Slice Identifier in IPv6 Flow Label
[I-D.filsfils-spring-srv6-stateless-slice-id] proposes to encode
slice identifers in a portion of the IPv6 Flow Label. Slice
identifiers are used by intermediate IPv6 routers to process the
packet according to a network slice policy.
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7.3. Slice Identifier in the Source Address of Encapsulated SRH
When an ingress SR router encapsulates a packet in an IPv6 packet
with an SRH, [I-D.cheng-spring-srv6-encoding-network-sliceid]
suggests to use the least significant bits of the outer IPv6 source
address to encode a slide identifier. SLID Presence Indicator (SPI)
is used to indicate the presence of a slice identifier. The number
of bits used to encode slice identifiers is local to an SR domain.
7.4. VTN Resource ID in an IPv6 Extension Header
[I-D.ietf-6man-enhanced-vpn-vtn-id] describes a mechanism to carry an
identifier, called VTN resource ID, in the IPv6 Hop-by-Hop extension
header. The document claims that "VTN resource ID" is equivalent to
NRP-ID, but does motivate why another yet ID is thus needed rather
than using "NRP-ID".
The length of the VTN ID depends on the context type. When CT=0, the
VTN ID is a 4-octet ID.
7.5. NRP
7.5.1. Resource-aware Segments
An NRP can be represented in SR networks using a set of NRP-specific
resource-aware segments [I-D.ietf-spring-resource-aware-segments]
[I-D.ietf-spring-sr-for-enhanced-vpn].
7.5.2. NRP ID in SRv6
[I-D.liu-spring-nrp-id-in-srv6-segment] specifies an approach to
encode the NRP ID in the SRH. This ID is used by intermediate IPv6
routers to identify the NRP to be used for forwarding. The encoding
of the NRP ID in an IPv6 address is variable; an instruction is thus
needed to help identifyint the NRP-ID position (e.g., low 16 bits).
7.5.3. NRP Selector in MPLS Network Actions
As mentioned in Section 3.2, packets that are associated with a
Slice-Flow Aggregate may carry an NRP Selector (NRPS). This selector
is intended to be conveyed in the packet's network layer header to
identify the flow aggregate to which a packet belongs.
[I-D.li-mpls-mna-nrp-selector] investigates a set of options to use
MPLS Network Actions (MNA) to carry the NRPS:
* 13-bit NRP Selector (NRPS13) Action
* 20-bit NRP Selector (NRPS20) Action
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* 20-bit Entropy and NRP Selector (ENRPS20) Action
8. OAM
8.1. LSP Ping/Traceroute Extensions
[I-D.liu-mpls-lsp-ping-nrp] specifies extenstions to the LSP Ping/
Traceroute to convey NRP-ID in SR domains.
The NRP-ID is a encoded as a 4-octet field.
8.2. Precision Availability Metrics for SLO-Governed End-to-End
Services
[I-D.ietf-ippm-pam] introduces a new set of metrics, called Precision
Availability Metrics (PAM). These metrics are used to assess whether
a service (e.g., Network Slice service) is provided in compliance
with its specified SLOs.
9. Misc
9.1. Scalability Considerations for NRP
[I-D.ietf-teas-nrp-scalability] discusses a set of scenarios for the
deployment of NRP with a focus on scalability implications. The
document reasons about the increase of requested IETF Network Slice
services that would require NRPs. Such an increase of slices is
speculative at this stage.
10. Security Considerations
Security considerations of the mechanisms listed in the document are
discussed in the relevant documents that specify these mechanisms.
11. IANA Considerations
This document does not make any request to IANA.
12. Informative References
[I-D.barguil-teas-network-slices-instantation]
Barguil, S., Contreras, L. M., Lopez, V., Rokui, R., de
Dios, O. G., and D. King, "Instantiation of IETF Network
Slices in Service Providers Network", Work in Progress,
Internet-Draft, draft-barguil-teas-network-slices-
instantation-06, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-barguil-teas-
network-slices-instantation-06>.
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[I-D.boro-opsawg-ntw-attachment-circuit]
Boucadair, M., Roberts, R., de Dios, O. G., Barguil, S.,
and B. Wu, "A Network YANG Data Model for Attachment
Circuits", Work in Progress, Internet-Draft, draft-boro-
opsawg-ntw-attachment-circuit-02, 9 March 2023,
<https://datatracker.ietf.org/doc/html/draft-boro-opsawg-
ntw-attachment-circuit-02>.
[I-D.boro-opsawg-teas-attachment-circuit]
Boucadair, M., Roberts, R., de Dios, O. G., Barguil, S.,
and B. Wu, "YANG Data Models for 'Attachment Circuits'-as-
a-Service (ACaaS)", Work in Progress, Internet-Draft,
draft-boro-opsawg-teas-attachment-circuit-06, 3 May 2023,
<https://datatracker.ietf.org/doc/html/draft-boro-opsawg-
teas-attachment-circuit-06>.
[I-D.boro-opsawg-teas-common-ac]
Boucadair, M., Roberts, R., de Dios, O. G., Barguil, S.,
and B. Wu, "A Common YANG Data Model for Attachment
Circuits", Work in Progress, Internet-Draft, draft-boro-
opsawg-teas-common-ac-02, 3 May 2023,
<https://datatracker.ietf.org/doc/html/draft-boro-opsawg-
teas-common-ac-02>.
[I-D.chen-idr-bgp-ls-sr-policy-nrp]
Chen, R., Zhao, D., Gong, L., and Y. Zhu, "SR Policies
Extensions for NRP in BGP-LS", Work in Progress, Internet-
Draft, draft-chen-idr-bgp-ls-sr-policy-nrp-02, 15 April
2023, <https://datatracker.ietf.org/doc/html/draft-chen-
idr-bgp-ls-sr-policy-nrp-02>.
[I-D.cheng-spring-srv6-encoding-network-sliceid]
Cheng, W., Yang, G., Lin, C., Gong, L., Zadok, S., Wu, M.,
and X. wang, "Encoding Network Slice Identification for
SRv6", Work in Progress, Internet-Draft, draft-cheng-
spring-srv6-encoding-network-sliceid-06, 17 April 2023,
<https://datatracker.ietf.org/doc/html/draft-cheng-spring-
srv6-encoding-network-sliceid-06>.
[I-D.contreras-teas-slice-controller-models]
Contreras, L. M., Rokui, R., Tantsura, J., Wu, B., Liu,
X., Dhody, D., and S. Belotti, "IETF Network Slice
Controller and its associated data models", Work in
Progress, Internet-Draft, draft-contreras-teas-slice-
controller-models-05, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-contreras-
teas-slice-controller-models-05>.
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[I-D.decraene-mpls-slid-encoded-entropy-label-id]
Decraene, B., Filsfils, C., Henderickx, W., Saad, T.,
Beeram, V. P., and L. Jalil, "Using Entropy Label for
Network Slice Identification in MPLS networks.", Work in
Progress, Internet-Draft, draft-decraene-mpls-slid-
encoded-entropy-label-id-05, 12 December 2022,
<https://datatracker.ietf.org/doc/html/draft-decraene-
mpls-slid-encoded-entropy-label-id-05>.
[I-D.dhody-teas-ietf-network-slice-mapping]
Dhody, D. and B. Wu, "IETF Network Slice Service Mapping
YANG Model", Work in Progress, Internet-Draft, draft-
dhody-teas-ietf-network-slice-mapping-03, 12 March 2023,
<https://datatracker.ietf.org/doc/html/draft-dhody-teas-
ietf-network-slice-mapping-03>.
[I-D.dong-idr-sr-policy-nrp]
Dong, J., Hu, Z., and R. Pang, "BGP SR Policy Extensions
for Network Resource Partition", Work in Progress,
Internet-Draft, draft-dong-idr-sr-policy-nrp-02, 30
January 2023, <https://datatracker.ietf.org/doc/html/
draft-dong-idr-sr-policy-nrp-02>.
[I-D.dong-pce-pcep-nrp]
Dong, J., Fang, S., Xiong, Q., Peng, S., Han, L., Wang,
M., Beeram, V. P., and T. Saad, "Path Computation Element
Communication Protocol (PCEP) Extensions for Network
Resource Partition (NRP)", Work in Progress, Internet-
Draft, draft-dong-pce-pcep-nrp-00, 10 March 2023,
<https://datatracker.ietf.org/doc/html/draft-dong-pce-
pcep-nrp-00>.
[I-D.drake-teas-bgp-ls-filter-nrp]
Drake, J., Farrel, A., Jalil, L., and A. Lingala, "Using
BGP-LS Filters to Instanted Network Resource Partitions",
Work in Progress, Internet-Draft, draft-drake-teas-bgp-ls-
filter-nrp-00, 16 December 2022,
<https://datatracker.ietf.org/doc/html/draft-drake-teas-
bgp-ls-filter-nrp-00>.
[I-D.filsfils-spring-srv6-stateless-slice-id]
Filsfils, C., Clad, F., Camarillo, P., Raza, S., Voyer,
D., and R. Rokui, "Stateless and Scalable Network Slice
Identification for SRv6", Work in Progress, Internet-
Draft, draft-filsfils-spring-srv6-stateless-slice-id-07,
29 January 2023, <https://datatracker.ietf.org/doc/html/
draft-filsfils-spring-srv6-stateless-slice-id-07>.
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[I-D.gong-teas-hierarchical-slice-solution]
Gong, L., Cheng, W., Lin, C., Chen, M., Dong, J., Chen,
R., and Y. Liang, "Segment Routing based Solution for
Hierarchical IETF Network Slices", Work in Progress,
Internet-Draft, draft-gong-teas-hierarchical-slice-
solution-01, 8 January 2023,
<https://datatracker.ietf.org/doc/html/draft-gong-teas-
hierarchical-slice-solution-01>.
[I-D.ietf-6man-enhanced-vpn-vtn-id]
Dong, J., Li, Z., Xie, C., Ma, C., and G. S. Mishra,
"Carrying Virtual Transport Network (VTN) Information in
IPv6 Extension Header", Work in Progress, Internet-Draft,
draft-ietf-6man-enhanced-vpn-vtn-id-04, 17 May 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-6man-
enhanced-vpn-vtn-id-04>.
[I-D.ietf-ccamp-yang-otn-slicing]
Guo, A., Contreras, L. M., Belotti, S., Rokui, R., Xu, Y.,
Zhao, Y., and X. Liu, "Framework and Data Model for OTN
Network Slicing", Work in Progress, Internet-Draft, draft-
ietf-ccamp-yang-otn-slicing-04, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-ccamp-
yang-otn-slicing-04>.
[I-D.ietf-dmm-tn-aware-mobility]
Chunduri, U., Kaippallimalil, J., Bhaskaran, S., Tantsura,
J., and P. Muley, "Mobility aware Transport Network
Slicing for 5G", Work in Progress, Internet-Draft, draft-
ietf-dmm-tn-aware-mobility-06, 19 April 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-dmm-tn-
aware-mobility-06>.
[I-D.ietf-idr-bgp-ct]
Vairavakkalai, K. and N. Venkataraman, "BGP Classful
Transport Planes", Work in Progress, Internet-Draft,
draft-ietf-idr-bgp-ct-04, 9 June 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-
ct-04>.
[I-D.ietf-idr-bgpls-sr-vtn-mt]
Xie, C., Li, C., Dong, J., and Z. Li, "BGP-LS with Multi-
topology for Segment Routing based Virtual Transport
Networks", Work in Progress, Internet-Draft, draft-ietf-
idr-bgpls-sr-vtn-mt-02, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-idr-
bgpls-sr-vtn-mt-02>.
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[I-D.ietf-idr-flowspec-network-slice-ts]
Dong, J., Chen, R., Wang, S., and J. Wenying, "BGP
Flowspec for IETF Network Slice Traffic Steering", Work in
Progress, Internet-Draft, draft-ietf-idr-flowspec-network-
slice-ts-00, 6 March 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-idr-
flowspec-network-slice-ts-00>.
[I-D.ietf-ippm-pam]
Mirsky, G., Halpern, J. M., Min, X., Clemm, A., Strassner,
J., and J. François, "Precision Availability Metrics for
SLO-Governed End-to-End Services", Work in Progress,
Internet-Draft, draft-ietf-ippm-pam-01, 8 March 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-ippm-
pam-01>.
[I-D.ietf-lsr-isis-sr-vtn-mt]
Xie, C., Ma, C., Dong, J., and Z. Li, "Using IS-IS Multi-
Topology (MT) for Segment Routing based Virtual Transport
Network", Work in Progress, Internet-Draft, draft-ietf-
lsr-isis-sr-vtn-mt-04, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-lsr-
isis-sr-vtn-mt-04>.
[I-D.ietf-opsawg-sap]
Boucadair, M., de Dios, O. G., Barguil, S., Wu, Q., and V.
Lopez, "A YANG Network Model for Service Attachment Points
(SAPs)", Work in Progress, Internet-Draft, draft-ietf-
opsawg-sap-15, 18 January 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-opsawg-
sap-15>.
[I-D.ietf-spring-resource-aware-segments]
Dong, J., Bryant, S., Miyasaka, T., Zhu, Y., Qin, F., Li,
Z., and F. Clad, "Introducing Resource Awareness to SR
Segments", Work in Progress, Internet-Draft, draft-ietf-
spring-resource-aware-segments-07, 31 May 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-spring-
resource-aware-segments-07>.
[I-D.ietf-spring-sr-for-enhanced-vpn]
Dong, J., Bryant, S., Miyasaka, T., Zhu, Y., Qin, F., Li,
Z., and F. Clad, "Segment Routing based Virtual Transport
Network (VTN) for Enhanced VPN", Work in Progress,
Internet-Draft, draft-ietf-spring-sr-for-enhanced-vpn-05,
31 May 2023, <https://datatracker.ietf.org/doc/html/draft-
ietf-spring-sr-for-enhanced-vpn-05>.
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[I-D.ietf-teas-5g-network-slice-application]
Geng, X., Contreras, L. M., Rokui, R., Dong, J., and I.
Bykov, "IETF Network Slice Application in 3GPP 5G End-to-
End Network Slice", Work in Progress, Internet-Draft,
draft-ietf-teas-5g-network-slice-application-00, 4 May
2023, <https://datatracker.ietf.org/doc/html/draft-ietf-
teas-5g-network-slice-application-00>.
[I-D.ietf-teas-applicability-actn-slicing]
King, D., Drake, J., Zheng, H., and A. Farrel,
"Applicability of Abstraction and Control of Traffic
Engineered Networks (ACTN) to Network Slicing", Work in
Progress, Internet-Draft, draft-ietf-teas-applicability-
actn-slicing-03, 6 March 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-teas-
applicability-actn-slicing-03>.
[I-D.ietf-teas-enhanced-vpn]
Dong, J., Bryant, S., Li, Z., Miyasaka, T., and Y. Lee, "A
Framework for Enhanced Virtual Private Network (VPN+)",
Work in Progress, Internet-Draft, draft-ietf-teas-
enhanced-vpn-12, 23 January 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-teas-
enhanced-vpn-12>.
[I-D.ietf-teas-ietf-network-slice-nbi-yang]
Wu, B., Dhody, D., Rokui, R., Saad, T., Han, L., and J.
Mullooly, "A YANG Data Model for the IETF Network Slice
Service", Work in Progress, Internet-Draft, draft-ietf-
teas-ietf-network-slice-nbi-yang-04, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-teas-
ietf-network-slice-nbi-yang-04>.
[I-D.ietf-teas-ietf-network-slices]
Farrel, A., Drake, J., Rokui, R., Homma, S., Makhijani,
K., Contreras, L. M., and J. Tantsura, "A Framework for
IETF Network Slices", Work in Progress, Internet-Draft,
draft-ietf-teas-ietf-network-slices-19, 21 January 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-teas-
ietf-network-slices-19>.
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[I-D.ietf-teas-nrp-scalability]
Dong, J., Li, Z., Gong, L., Yang, G., Guichard, J.,
Mishra, G. S., Qin, F., Saad, T., and V. P. Beeram,
"Scalability Considerations for Network Resource
Partition", Work in Progress, Internet-Draft, draft-ietf-
teas-nrp-scalability-02, 2 June 2023,
<https://datatracker.ietf.org/doc/html/draft-ietf-teas-
nrp-scalability-02>.
[I-D.ietf-teas-ns-ip-mpls]
Saad, T., Beeram, V. P., Dong, J., Wen, B., Ceccarelli,
D., Halpern, J. M., Peng, S., Chen, R., Liu, X.,
Contreras, L. M., Rokui, R., and L. Jalil, "Realizing
Network Slices in IP/MPLS Networks", Work in Progress,
Internet-Draft, draft-ietf-teas-ns-ip-mpls-02, 13 March
2023, <https://datatracker.ietf.org/doc/html/draft-ietf-
teas-ns-ip-mpls-02>.
[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-13, 11
March 2023, <https://datatracker.ietf.org/doc/html/draft-
ietf-teas-te-service-mapping-yang-13>.
[I-D.li-mpls-mna-nrp-selector]
Li, T., Drake, J., Beeram, V. P., Saad, T., and I. Meilik,
"MPLS Network Actions for Network Resource Partition
Selector", Work in Progress, Internet-Draft, draft-li-
mpls-mna-nrp-selector-00, 5 May 2023,
<https://datatracker.ietf.org/doc/html/draft-li-mpls-mna-
nrp-selector-00>.
[I-D.li-teas-composite-network-slices]
Li, Z., Dong, J., Pang, R., Zhu, Y., and L. M. Contreras,
"Realization of Composite IETF Network Slices", Work in
Progress, Internet-Draft, draft-li-teas-composite-network-
slices-00, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-li-teas-
composite-network-slices-00>.
[I-D.liu-idr-bgp-network-slicing]
Yao, L. and S. Peng, "BGP Extensions to Support Packet
Network Slicing in SR Policy", Work in Progress, Internet-
Draft, draft-liu-idr-bgp-network-slicing-02, 31 March
2023, <https://datatracker.ietf.org/doc/html/draft-liu-
idr-bgp-network-slicing-02>.
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[I-D.liu-mpls-lsp-ping-nrp]
Yao, L. and S. Peng, "LSP Ping/Traceroute for SR-MPLS NRP
SIDs", Work in Progress, Internet-Draft, draft-liu-mpls-
lsp-ping-nrp-01, 12 March 2023,
<https://datatracker.ietf.org/doc/html/draft-liu-mpls-lsp-
ping-nrp-01>.
[I-D.liu-spring-nrp-id-in-srv6-segment]
Liu, Y., Lin, C., Li, H., and L. Gong, "NRP ID in SRv6
segment", Work in Progress, Internet-Draft, draft-liu-
spring-nrp-id-in-srv6-segment-02, 17 April 2023,
<https://datatracker.ietf.org/doc/html/draft-liu-spring-
nrp-id-in-srv6-segment-02>.
[I-D.liu-teas-transport-network-slice-yang]
Liu, X., Tantsura, J., Bryskin, I., Contreras, L. M., Wu,
Q., Belotti, S., Rokui, R., Guo, A., and I. Busi, "IETF
Network Slice Topology YANG Data Model", Work in Progress,
Internet-Draft, draft-liu-teas-transport-network-slice-
yang-06, 13 March 2023,
<https://datatracker.ietf.org/doc/html/draft-liu-teas-
transport-network-slice-yang-06>.
[I-D.srld-teas-5g-slicing]
Szarkowicz, K. G., Roberts, R., Lucek, J., Boucadair, M.,
and L. M. Contreras, "A Realization of IETF Network Slices
for 5G Networks Using Current IP/ MPLS Technologies", Work
in Progress, Internet-Draft, draft-srld-teas-5g-slicing-
09, 23 May 2023, <https://datatracker.ietf.org/doc/html/
draft-srld-teas-5g-slicing-09>.
[I-D.sw-detnet-network-slice-mapping-yang]
Song, X. and H. Wu, "YANG Data Model for DetNet Mapping
with Network Slice", Work in Progress, Internet-Draft,
draft-sw-detnet-network-slice-mapping-yang-02, 8 March
2023, <https://datatracker.ietf.org/doc/html/draft-sw-
detnet-network-slice-mapping-yang-02>.
[I-D.wdbsp-teas-nrp-yang]
Wu, B., Dhody, D., Beeram, V. P., Saad, T., and S. Peng,
"A YANG Data Model for Network Resource Partitions
(NRPs)", Work in Progress, Internet-Draft, draft-wdbsp-
teas-nrp-yang-00, 7 April 2023,
<https://datatracker.ietf.org/doc/html/draft-wdbsp-teas-
nrp-yang-00>.
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[RFC9181] Barguil, S., Gonzalez de Dios, O., Ed., Boucadair, M.,
Ed., and Q. Wu, "A Common YANG Data Model for Layer 2 and
Layer 3 VPNs", RFC 9181, DOI 10.17487/RFC9181, February
2022, <https://www.rfc-editor.org/rfc/rfc9181>.
[RFC9182] Barguil, S., Gonzalez de Dios, O., Ed., Boucadair, M.,
Ed., Munoz, L., and A. Aguado, "A YANG Network Data Model
for Layer 3 VPNs", RFC 9182, DOI 10.17487/RFC9182,
February 2022, <https://www.rfc-editor.org/rfc/rfc9182>.
[RFC9291] Boucadair, M., Ed., Gonzalez de Dios, O., Ed., Barguil,
S., and L. Munoz, "A YANG Network Data Model for Layer 2
VPNs", RFC 9291, DOI 10.17487/RFC9291, September 2022,
<https://www.rfc-editor.org/rfc/rfc9291>.
Acknowledgments
Thanks to Kaliraj Vairavakkalai for the comments.
Author's Address
Mohamed Boucadair
Orange
35000 Rennes
France
Email: mohamed.boucadair@orange.com
Boucadair Expires 14 December 2023 [Page 22]