An Enhanced Source Routing Header Based on RH3
draft-han-6man-enhanced-source-routing-header-01

Document Type Active Internet-Draft (individual)
Author Han Jie 
Last updated 2020-11-15
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L                                                                 H. Jie
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                       November 15, 2020
Expires: May 15, 2021

             An Enhanced Source Routing Header Based on RH3
            draft-han-6man-enhanced-source-routing-header-01

Abstract

   IPv6 Routing header type 3 (termed as RH3) is defined and used in
   Low-Power and Lossy Networks (LLNs) that are typically constrained in
   resources (limited communication data rate, processing power, energy
   capacity, memory).  Based on the mechanisms introduced by RH3, this
   document specifies an new IPv6 Routing Header type that provides
   encapsulation capability of segments with various lengths and can be
   applied to more scenarios.

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   This Internet-Draft will expire on May 16, 2021.

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   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Jie                       Expires May 16, 2021                  [Page 1]
Internet-Draft       Enhanced Source Routing Header        November 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Format of the Source Routing Header . . . . . . . . . . . . .   3
   4.  Format of the Enhanced Source Routing Header  . . . . . . . .   3
   5.  Generating E-SRH  . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Processing E-SRH  . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Deployment Considerations . . . . . . . . . . . . . . . . . .   8
     7.1.  Heterogeneous Segment List  . . . . . . . . . . . . . . .   9
     7.2.  Independent Arguments in E-SRH  . . . . . . . . . . . . .   9
     7.3.  ICMP Error Processing . . . . . . . . . . . . . . . . . .   9
     7.4.  Repair Path . . . . . . . . . . . . . . . . . . . . . . .  10
     7.5.  Binding to Outer Segment List . . . . . . . . . . . . . .  10
     7.6.  In-situ OAM . . . . . . . . . . . . . . . . . . . . . . .  10
     7.7.  NAT Service Funtion . . . . . . . . . . . . . . . . . . .  11
     7.8.  Operation and Maintenance . . . . . . . . . . . . . . . .  11
     7.9.  Upper-Layer Checksums . . . . . . . . . . . . . . . . . .  11
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   10. Normative References  . . . . . . . . . . . . . . . . . . . .  12
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   Routing headers are defined in [RFC8200].  [RFC6554] specifies the
   Source Routing Header (SRH), i.e., IPv6 Routing header type 3 (termed
   as RH3), for use strictly between RPL routers in the Low-Power and
   Lossy Networks (LLNs) [RFC6550], which are typically constrained in
   resources (limited communication data rate, processing power, energy
   capacity, memory).  It introduces mechanisms to compact the source
   route entries when all entries share the same prefix with the IPv6
   Destination Address of a packet carrying an RH3, a typical scenario
   in LLNs using source routing.  The compaction mechanism reduces
   consumption of scarce resources such as channel capacity.  However,
   it is challenging when all entries do not have the same prefix, for
   example, only a part of entries share the same prefix, but still want
   to encode all routries in a single routing header and reduce the
   overhead.

   This document specifies an enhanced Source Routing Header (termed as
   E-SRH) to enhance the encapsulation capability of segments with
   various lengths and different types, and attempt to apply to more
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