A 6loRH for BitStrings
draft-thubert-6lo-bier-dispatch-06

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6lo                                                      P. Thubert, Ed.
Internet-Draft                                                     Cisco
Intended status: Standards Track                              Z. Brodard
Expires: August 1, 2019                              Ecole Polytechnique
                                                                H. Jiang
                                                               G. Texier
                                                        Telecom Bretagne
                                                        January 28, 2019

                         A 6loRH for BitStrings
                   draft-thubert-6lo-bier-dispatch-06

Abstract

   This specification extends the 6LoWPAN Routing Header to signal
   BitStrings such as utilized in Bit Index Explicit Replication and its
   Traffic Engineering variant.

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   This Internet-Draft will expire on August 1, 2019.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Thubert, et al.          Expires August 1, 2019                 [Page 1]
Internet-Draft           A 6loRH for BitStrings             January 2019

   the Trust Legal Provisions and are provided without warranty as
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  The BIER-6LoRH encoding . . . . . . . . . . . . . . . . . . .   4
     4.1.  The Bit-by-bit BitStrings . . . . . . . . . . . . . . . .   4
     4.2.  The Enumeration BitStrings  . . . . . . . . . . . . . . .   5
     4.3.  Bloom Filters . . . . . . . . . . . . . . . . . . . . . .   5
     4.4.  Types of BIER-6LoRH header  . . . . . . . . . . . . . . .   6
   5.  Implementation Status . . . . . . . . . . . . . . . . . . . .   8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The type of information that needs to be present in a packet inside
   the LLN but not outside of the LLN varies with the routing operation,
   but there is overall a need for an extensible compression technique
   that would simplify the IP-in-IP encapsulation, when needed, and
   optimally compress existing routing artifacts found in LLNs.

   The 6LoWPAN Routing Header (6LoRH) [RFC8025] [RFC8138] is such a
   technique, that extends the 6lo adaptation layer framework [RFC4944],
   [RFC6282] so as to carry routing information for Route-over use
   cases.  The original specification includes the formats necessary for
   RPL such as the Source Route Header (SRH) and is intended to be
   extended for additional routing artifacts.

   The Bit Index Explicit Replication (BIER), as introduced in the BIER
   Architecture [RFC8279], can be used as an alternate artifact to route
   multicast as well as unicast traffic.  The Traffic Engineering for
   Bit Index Explicit Replication [I-D.eckert-bier-te-arch] (BIER-TE)
   adds support for traffic engineering by explicit hop-by-hop
   forwarding and loose hop forwarding of packets along a unicast route.

   This specification provides additional formats for the 6LoRH
   compression to carry BitStrings such as used for Bit Index Explicit
   Replication and its Traffic Engineering variant (BIER and BIER-TE,