Path Segment in MPLS Based Segment Routing Network
draft-cheng-spring-mpls-path-segment-03

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SPRING Working Group                                            W. Cheng
Internet-Draft                                                   L. Wang
Intended status: Standards Track                                   H. Li
Expires: April 19, 2019                                     China Mobile
                                                                 M. Chen
                                                                  Huawei
                                                               R. Gandhi
                                                     Cisco Systems, Inc.
                                                               R. Zigler
                                                                Broadcom
                                                                 S. Zhan
                                                                     ZTE
                                                        October 16, 2018

           Path Segment in MPLS Based Segment Routing Network
                draft-cheng-spring-mpls-path-segment-03

Abstract

   A Segment Routing (SR) path is identified by an SR segment list, one
   or partial segments of the list cannot uniquely identify the SR path.
   Path identification is a pre-requisite for various use-cases such as
   performance measurement (PM) of an SR path.

   This document defines a new type of segment that is referred to as
   Path Segment, which is used to identify an SR path.  When used, it is
   inserted at the ingress node of the SR path and immediately follows
   the last segment of the SR path.  The Path Segment will not be popped
   off until it reaches the egress node of the SR path.

   Path Segment can be used by the egress node to implement path
   identification hence to support various use-cases including SR path
   PM, end-to-end 1+1 SR path protection and bidirectional SR paths
   correlation.

Status of This Memo

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Cheng, et al.            Expires April 19, 2019                 [Page 1]
Internet-Draft           Path Segment in SR-MPLS            October 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Path Segment  . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Nesting of Path Segments  . . . . . . . . . . . . . . . . . .   5
   4.  Path Segment Allocation . . . . . . . . . . . . . . . . . . .   6
   5.  Path Segment for PM . . . . . . . . . . . . . . . . . . . . .   6
   6.  Path Segment for Bi-directional SR Path . . . . . . . . . . .   7
   7.  Path Segment for End-to-end Path Protection . . . . . . . . .   7
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     12.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     12.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Segment Routing (SR) [RFC8402] is a source routed forwarding method
   that allows to directly encode forwarding instructions (called
   segments) in each packet, hence it enables to steer traffic through a
   network without the per-flow states maintained on the transit nodes.
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