Encapsulation of Path Segment in SRv6
draft-li-6man-srv6-path-segment-encap-00

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6man Working Group                                                 C. Li
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                                W. Cheng
Expires: January 9, 2020                                    China Mobile
                                                                   Z. Li
                                                                D. Dhody
                                                     Huawei Technologies
                                                            July 8, 2019

                 Encapsulation of Path Segment in SRv6
                draft-li-6man-srv6-path-segment-encap-00

Abstract

   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths by encoding paths as sequences of sub-paths, called "segments".
   Segment routing architecture can be implemented over IPv6 data plane,
   called SRv6.  In some use-cases such as end-to-end SR Path Protection
   and Performance Measurement (PM), SRv6 path need to be identified.
   This document defines the encoding and processing of Path Segment in
   SRv6 networks.

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   (https://trustee.ietf.org/license-info) in effect on the date of

Li, et al.               Expires January 9, 2020                [Page 1]
Internet-Draft               SRv6 PSID Encap                   July 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Encoding of SRv6 Path Segment . . . . . . . . . . . . . . . .   3
     2.1.  Encapsulation of SRv6 Path Segment  . . . . . . . . . . .   4
     2.2.  Format of SRv6 Path Segment . . . . . . . . . . . . . . .   5
       2.2.1.  SRv6 Path Segment: Locator and Local ID . . . . . . .   5
       2.2.2.  SRv6 Path Segment: Global ID  . . . . . . . . . . . .   5
   3.  Processing of SRv6 Path Segment . . . . . . . . . . . . . . .   6
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

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 IPv6 dataplane, it is called SRv6
   [I-D.ietf-6man-segment-routing-header], and it uses the a new IPv6
   [RFC8200] Extension Header (EH) called the IPv6 Segment Routing
   Header (SRH) [I-D.ietf-6man-segment-routing-header] to construct SRv6
   path.  As per [I-D.ietf-spring-srv6-network-programming], an SRv6
   segment is a 128-bit value, which can be represented as LOC:FUNCT,
   where LOC is the L most significant bits and FUNCT is the 128-L least
   significant bits.  Most often the LOC part of the SID is routable and
   leads to the node which instantiates that SID.  The FUNCT part of the
   SID is an opaque identification of a local function bound to the SID.

   In several use cases, such as binding bidirectional path
   [I-D.li-pce-sr-bidir-path] and end-to-end performance measurement
   [I-D.gandhi-spring-twamp-srpm], the ability to implement path
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