Path Segment for SRv6 (Segment Routing in IPv6)
draft-li-spring-srv6-path-segment-00

Document Type Active Internet-Draft (individual)
Last updated 2018-10-22
Replaces draft-li-spring-passive-pm-for-srv6-np
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SPRING Working Group                                               C. Li
Internet-Draft                                                   M. Chen
Intended status: Standards Track                                D. Dhody
Expires: April 25, 2019                                            Z. Li
                                                                 J. Dong
                                                     Huawei Technologies
                                                               R. Gandhi
                                                     Cisco Systems, Inc.
                                                        October 22, 2018

            Path Segment for SRv6 (Segment Routing in IPv6)
                  draft-li-spring-srv6-path-segment-00

Abstract

   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths by encoding paths as sequences of topological sub-paths, called
   "segments".  Segment routing architecture can be implemented over an
   MPLS data plane as well as an IPv6 data plane.

   Further, Path Segment has been defined to identify an SR path in SR-
   MPLS networks, and used for various use-cases such as end-to-end SR
   Path Protection and Performance Measurement (PM) of an SR path.
   Similar to SR-MPLS, this document defines Path Segment in SRv6
   networks to identify an SRv6 path.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on April 25, 2019.

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Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  SRv6 Path Segment . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Operation . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Segment routing (SR) [RFC8402] is a source routing paradigm that
   explicitly indicates the forwarding path for packets at the ingress
   node by inserting an ordered list of instructions, called segments.

   When segment routing is deployed on MPLS dataplane, called SR-MPLS
   [I-D.ietf-spring-segment-routing-mpls], a segment is an MPLS label.
   When segment routing is deployed on IPv6 dataplane, called SRv6
   [I-D.ietf-6man-segment-routing-header], a segment is a 128 bit value,
   and it can be an IPv6 address of a local interface but it does not
   have to.  For supporting SR, an extended header called Segment
   Routing Header (SRH), which contains a list of SIDs and several
   needed information such as Segments Left, has been defined in
   [I-D.ietf-6man-segment-routing-header].

   In an SR-MPLS network, when a packet is transmitted along an SR path,
   the labels in the MPLS label stack will be swapped or popped, so no

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   label or only the last label may be left in the MPLS label stack when
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