Packet Network Slicing using Segment Routing
draft-peng-teas-network-slicing-03

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TEAS                                                        Shaofu. Peng
Internet-Draft                                                 Ran. Chen
Intended status: Standards Track                         Gregory. Mirsky
Expires: August 19, 2020                                 ZTE Corporation
                                                            Fengwei. Qin
                                                            China Mobile
                                                       February 16, 2020

              Packet Network Slicing using Segment Routing
                   draft-peng-teas-network-slicing-03

Abstract

   This document presents a mechanism aimed at providing a solution for
   network slicing in the transport network for 5G services.  The
   proposed mechanism uses a unified administrative instance identifier
   to distinguish different virtual network resources for both intra-
   domain and inter-domain network slicing scenarios.  Combined with the
   segment routing technology, the mechanism could be used for both
   best-effort and traffic engineered services for tenants.

Status of This Memo

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   This Internet-Draft will expire on August 19, 2020.

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Peng, et al.             Expires August 19, 2020                [Page 1]
Internet-Draft       Packet Network Slicing using SR       February 2020

   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Architecture of TN Slicing  . . . . . . . . . . . . . . . . .   3
     2.1.  Key Technologies of Transport slice . . . . . . . . . . .   5
   3.  Slicing Requirements  . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Dedicated Virtual Networks  . . . . . . . . . . . . . . .   6
     3.2.  End-to-End Slicing  . . . . . . . . . . . . . . . . . . .   6
     3.3.  Unified NSI . . . . . . . . . . . . . . . . . . . . . . .   6
     3.4.  Traffic Engineering . . . . . . . . . . . . . . . . . . .   7
     3.5.  Summarized Requirements . . . . . . . . . . . . . . . . .   7
   4.  Conventions Used in This Document . . . . . . . . . . . . . .   8
   5.  Overview of Existing Identifiers  . . . . . . . . . . . . . .   8
     5.1.  AG and EAG Bit  . . . . . . . . . . . . . . . . . . . . .   8
     5.2.  Multi-Topology Identifier . . . . . . . . . . . . . . . .   9
     5.3.  SR Policy Color . . . . . . . . . . . . . . . . . . . . .   9
     5.4.  Flex-algorithm Identifier . . . . . . . . . . . . . . . .   9
     5.5.  New Slice-based Identifier Introduced . . . . . . . . . .  10
   6.  Overview of AII-based Mechanism . . . . . . . . . . . . . . .  10
     6.1.  Physical Network Partition by AII . . . . . . . . . . . .  11
     6.2.  Path within AII specific Slice  . . . . . . . . . . . . .  11
       6.2.1.  SR-BE Path within AII specific Slice  . . . . . . . .  11
       6.2.2.  SR-TE Path within AII specific Slice  . . . . . . . .  12
     6.3.  Traffic Steering to SR policy within Slice  . . . . . . .  12
     6.4.  Simple Variant of AII-based Slicing Scheme  . . . . . . .  13
   7.  Resource Allocation per AII . . . . . . . . . . . . . . . . .  13
     7.1.  L3 Link Resource AII Configuration  . . . . . . . . . . .  13
     7.2.  L2 Link Resource AII Configuration  . . . . . . . . . . .  14
     7.3.  Node Resource AII Configuration . . . . . . . . . . . . .  14
     7.4.  Service Function Resource AII Configuration . . . . . . .  15
   8.  E2E Slicing with Centralized Mode . . . . . . . . . . . . . .  15
   9.  E2E Slicing with Distributed Mode . . . . . . . . . . . . . .  16
   10. Combined with SR Flex-algorithm for Stack Depth Optimization   16
     10.1.  Flex-algo Using AII Criteria . . . . . . . . . . . . . .  17
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