The Use of Path Segment in SR-MPLS and MPLS Interworking
draft-xiong-mpls-path-segment-sr-mpls-interworking-00

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MPLS                                                          Quan Xiong
Internet-Draft                                               Greg Mirsky
Intended status: Standards Track                         ZTE Corporation
Expires: January 4, 2020                                  Weiqiang Cheng
                                                            China Mobile
                                                            July 3, 2019

        The Use of Path Segment in SR-MPLS and MPLS Interworking
         draft-xiong-mpls-path-segment-sr-mpls-interworking-00

Abstract

   This document discusses the SR-MPLS and MPLS interworking scenarios
   and proposes the solution with the use of Path Segment.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   2
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  SR-MPLS Interworking with MPLS  . . . . . . . . . . . . . . .   3
     3.1.  Stitching interworking with i-Path  . . . . . . . . . . .   4
     3.2.  Nesting interworking with e-Path  . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Segment Routing (SR) leverages the source routing paradigm.  A node
   steers a packet through a SR Policy instantiated as an ordered list
   of instructions called "segments".  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 which is referred to as SR-MPLS
   [I-D.ietf-spring-segment-routing-mpls].  SR-MPLS leverages the MPLS
   label stack to construct the SR path.

   In some scenarios, for example, mobile backhaul transport network, it
   is required to provide end-to-end bidirectional tunnel across
   multiple domains.  IP/MPLS technology can be deployed in these
   domains which may be access network, aggregation network or core
   network under the control of a single operator.  With the SR
   architecture, the IP/MPLS may be upgraded to support the SR-MPLS
   technology.  There are requirements to support the interworking
   between MPLS and SR-MPLS neworks at the boundaries and provide end-
   to-end bidirectional service.

   [I-D.ietf-spring-mpls-path-segment] defined a Path Segment identifier
   to support SR path PM, end-to-end 1+1 SR path protection and
   bidirectional SR paths correlation.  This document discusses the
   interworking scenarios between SR-MPLS and MPLS networks and proposes
   the solution with the use of Path Segment.

2.  Conventions used in this document

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2.1.  Terminology

   ABR: Area Border Routers.  Routers used to connect two IGP areas
   (areas in OSPF or levels in IS-IS).

   AS: Autonomous System.  An Autonomous System is composed by one or
   more IGP area.
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