Packet Network Slicing using Segment Routing
draft-peng-teas-network-slicing-04
TEAS Shaofu. Peng
Internet-Draft Ran. Chen
Intended status: Standards Track Gregory. Mirsky
Expires: April 23, 2021 ZTE Corporation
Fengwei. Qin
China Mobile
October 20, 2020
Packet Network Slicing using Segment Routing
draft-peng-teas-network-slicing-04
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.
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This Internet-Draft will expire on April 23, 2021.
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Internet-Draft Packet Network Slicing using SR October 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Architecture of TN Slicing . . . . . . . . . . . . . . . . . 4
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 . . . . . . . . . . . . . . . . . . . . . . . 7
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 . . . . . . . . 12
6.2.2. SR-TE Path within AII specific Slice . . . . . . . . 13
6.3. Traffic Steering to SR policy within Slice . . . . . . . 13
6.4. Simple Variant of AII-based Slicing Scheme . . . . . . . 13
7. Resource Allocation per AII . . . . . . . . . . . . . . . . . 14
7.1. L3 Link Resource AII Configuration . . . . . . . . . . . 14
7.2. L2 Link Resource AII Configuration . . . . . . . . . . . 15
7.3. Node Resource AII Configuration . . . . . . . . . . . . . 15
7.4. Service Function Resource AII Configuration . . . . . . . 16
8. E2E Slicing with Centralized Mode . . . . . . . . . . . . . . 16
9. E2E Slicing with Distributed Mode . . . . . . . . . . . . . . 17
10. Combined with SR Flex-algorithm for Stack Depth Optimization 17
10.1. Flex-algo Using AII Criteria . . . . . . . . . . . . . . 18
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