IETF Definition of Transport Slice
draft-nsdt-teas-transport-slice-definition-00

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teas                                                            R. Rokui
Internet-Draft                                                     Nokia
Intended status: Informational                                  S. Homma
Expires: May 5, 2020                                                 NTT
                                                            K. Makhijani
                                                               Futurewei
                                                        November 2, 2019

                   IETF Definition of Transport Slice
             draft-nsdt-teas-transport-slice-definition-00

Abstract

   This document describes the definition of transport slice in IETF and
   considerations on implementation (realization) of transport slice.
   This work is part of work on TEAS WG network slicing Design Team.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  High level architecture of end-to-end network slicing . . . .   3
   3.  IETF Definition of Transport slice  . . . . . . . . . . . . .   5
     3.1.  Scenario-1  . . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Scenario-2  . . . . . . . . . . . . . . . . . . . . . . .   7
     3.3.  Scenario-3  . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Implementation (aka Realization) of Transport slice . . . . .   9
     4.1.  Implementation of Scenario-1  . . . . . . . . . . . . . .   9
     4.2.  Implementation of Scenario-2  . . . . . . . . . . . . . .  11
     4.3.  Implementation of Scenario-3  . . . . . . . . . . . . . .  12
   5.  Definition of SLA and Isolation levels  . . . . . . . . . . .  15
   6.  Informative References  . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   Network slicing is an approach to provide separate virtual networks
   depending on requirements of each service.  Network slicing receives
   attention due to factors such as diversity of services and devices,
   and it is also a fundamental concept of the 5G for applying networks
   to such various types of requirements (Ref [TS.23.501-3GPP]).
   However there are other applications which might benefit from network
   slicing.  Following is a list of other applicaitons:

   o  5G network slicig

   o  Wholesale business VPN

   o  Network sharing among operators

   o  NVVI connectivity (DCI)

   A network slice is composed of several parts such as endpoints and
   transport connecctivity between them.  However, there is no concrete
   definition of network slices established on transport and how to
   realize them.

   This document describes the definition of transport slice from IETF
   aspect and considerations on their realization as well.

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2.  High level architecture of end-to-end network slicing

   To demonstrate IETF definition of both E2E network slice and
   transport slice, consider a typical network shown in Figure 1 where
   the network operator-Y has various networks of various technologies
   (e.g.  IP, MPLS, Optics, PON, Microwave, 5G RAN, 5G Core etc.).  Each
   network contains one or more nodes of (aka physical or virtual
   network functions, PNFs or VNFs), which have various capabilities and
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