Path Segment in MPLS Based Sement Routing Network
draft-cheng-spring-mpls-path-segment-01

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Network Working Group                                           W. Cheng
Internet-Draft                                                   L. Wang
Intended status: Standards Track                                   H. Li
Expires: September 3, 2018                                  China Mobile
                                                                 M. Chen
                                                                  Huawei
                                                               R. Zigler
                                                                Broadcom
                                                                 S. Zhan
                                                                     ZTE
                                                           March 2, 2018

           Path Segment in MPLS Based Sement Routing Network
                draft-cheng-spring-mpls-path-segment-01

Abstract

   An SR path is identified by an SR segment list, one or partial
   segments of the list cannot uniquely identify the SR path.

   This document introduces the concept of Path Segment that 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 of the SR path, it can be used by the egress node to implement
   end-2-end SR path protection or performance measurement (PM)
   (especially for measuring packet loss of real traffic) of an SR path.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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Cheng, et al.           Expires September 3, 2018               [Page 1]
Internet-Draft           Path Segment in SR-MPLS              March 2018

   time.  It is inappropriate to use Internet-Drafts as reference
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Path Segment  . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  One Label Solution  . . . . . . . . . . . . . . . . . . .   3
       2.1.1.  Path Segment Assignment . . . . . . . . . . . . . . .   4
     2.2.  Two Labels Solution . . . . . . . . . . . . . . . . . . .   5
   3.  Path Segment Application  . . . . . . . . . . . . . . . . . .   7
     3.1.  Packet Loss Measurement for Real Traffic  . . . . . . . .   7
     3.2.  End-2-end Path Protection . . . . . . . . . . . . . . . .   7
     3.3.  Bi-directional SR Tunnel  . . . . . . . . . . . . . . . .   7
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Segment Routing (SR) [I-D.ietf-spring-segment-routing] 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 in the transit nodes.  Segment Routing can be instantiated
   on MPLS data plane or IPv6 data plane.  The former is called SR-MPLS
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