Inter-domain Use Cases of Segment Routing with MPLS Data Plane for Transport Network
draft-hu-mpls-sr-inter-domain-use-cases-01

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MPLS Workgroup                                                Quan Xiong
Internet-Draft                                               Greg Mirsky
Intended status: Standards Track                         ZTE Corporation
Expires: September 11, 2019                                   Fangwei Hu
                                                              Individual
                                                          Weiqiang Cheng
                                                            China Mobile
                                                          March 10, 2019

   Inter-domain Use Cases of Segment Routing with MPLS Data Plane for
                           Transport Network
               draft-hu-mpls-sr-inter-domain-use-cases-01

Abstract

   This document discusses the inter-domain scenarios for Transport
   Profile of SR-MPLS (SR-MPLS-TP), including SR-MPLS-TP inter-working
   with MPLS-TP network.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Transport Profile in SR-MPLS  . . . . . . . . . . . . . . . .   3
   4.  SR-MPLS-TP Inter-domain . . . . . . . . . . . . . . . . . . .   4
     4.1.  SR-MPLS-TP Stitching Inter-domain . . . . . . . . . . . .   4
       4.1.1.  Inter-domain Path Segment . . . . . . . . . . . . . .   4
       4.1.2.  Border Node Inter-domain Scenario . . . . . . . . . .   5
       4.1.3.  Border Link Inter-domain Scenario . . . . . . . . . .   5
     4.2.  SR-MPLS-TP Nesting Inter-domain . . . . . . . . . . . . .   7
   5.  SR-MPLS-TP Inter-working with MPLS-TP . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through an SR Policy instantiated as an ordered list
   of instructions called "segments".  A segment can represent any
   instruction, topological or service based.  A segment can have a
   semantic local to an SR node or global within an SR domain.  SR
   supports per-flow explicit routing while maintaining per-flow state
   only at the ingress nodes of the SR domain.  Segment Routing can be
   instantiated on MPLS data plane or IPv6 data plane.  The former is
   referred to as SR-MPLS [I-D.ietf-spring-segment-routing-mpls], the
   latter is SRv6 [I-D.ietf-6man-segment-routing-header].  SR-MPLS
   leverages the MPLS label stack to construct the SR path, and SRv6
   uses the Segment Routing Header to construct the SR path.

   [I-D.cheng-spring-mpls-path-segment] defines a Path Segment
   identifier to support bidirectional path correlation for transport
   network.  This document defines an inter-domain path segment and
   discusses the inter-domain use cases in the context of the Transport
   Profile of SR-MPLS, referred to in this document as SR-MPLS-TP, and
   describes the use case related to SR-MPLS-TP inter-working with the
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