IPv6 Router Advertisement Prefix Information Option Exclusive Bit
draft-pioxfolks-6man-pio-exclusive-bit-01

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Last updated 2016-10-28
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Internet Engineering Task Force                                 E. Kline
Internet-Draft                                           Google Japan KK
Updates: 4861 (if approved)                               M. Abrahamsson
Intended status: Experimental                           T-Systems Nordic
Expires: April 30, 2017                                 October 27, 2016

   IPv6 Router Advertisement Prefix Information Option Exclusive Bit
               draft-pioxfolks-6man-pio-exclusive-bit-01

Abstract

   This document defines a new control bit in the IPv6 RA PIO flags
   octet that indicates that the node receiving this RA is the exclusive
   receiver of all traffic destined to any address within that prefix.

   Termed the eXclusive bit (or "X bit"), nodes that recognize this can
   perform some optimizations to save time and traffic (e.g. disable ND
   and DAD for addresses within this prefix) and more immediately pursue
   the benefits of being provided multiple addresses (vis.  [RFC7934]
   section 3).  Additionally, network infrastructure nodes (routers,
   switches) can benefit by minimizing the number of {link layer, IP}
   address pairs required to offer network connectivity (vis.  [RFC7934]
   section 9.3).

   Use of the X bit is backward compatible with existing IPv6 standards
   compliant implementations.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on April 30, 2017.

Kline & Abrahamsson      Expires April 30, 2017                 [Page 1]
Internet-Draft          IPv6 RA PIO Exclusive Bit           October 2016

Copyright Notice

   Copyright (c) 2016 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Efficiency improvements . . . . . . . . . . . . . . . . .   4
     2.2.  New architectural possibilities . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Requirements Language . . . . . . . . . . . . . . . . . .   5
     3.2.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   5
       3.2.1.  PIO-X . . . . . . . . . . . . . . . . . . . . . . . .   5
       3.2.2.  PIO-X RA  . . . . . . . . . . . . . . . . . . . . . .   5
       3.2.3.  Host  . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Concepts  . . . . . . . . . . . . . . . . . . . . . . . .   5
       3.3.1.  Link layer guarantees . . . . . . . . . . . . . . . .   6
       3.3.2.  Likely sole intended recipient  . . . . . . . . . . .   6
   4.  Updated Prefix Information Option . . . . . . . . . . . . . .   6
     4.1.  Updated format description  . . . . . . . . . . . . . . .   6
     4.2.  Processing  . . . . . . . . . . . . . . . . . . . . . . .   7
       4.2.1.  Verify sole recipient . . . . . . . . . . . . . . . .   7
       4.2.2.  (Re)Interpretation of other flags . . . . . . . . . .   8
         4.2.2.1.  PIO L bit . . . . . . . . . . . . . . . . . . . .   8
         4.2.2.2.  PIO A bit . . . . . . . . . . . . . . . . . . . .   8
     4.3.  Transmitting PIO-X RAs  . . . . . . . . . . . . . . . . .   9
   5.  Host behavior . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  PIO-X processing  . . . . . . . . . . . . . . . . . . . .   9
     5.2.  Neighbor Discovery implications . . . . . . . . . . . . .   9
       5.2.1.  Duplicate Address Detection (DAD) . . . . . . . . . .   9
       5.2.2.  Router Solicitations (RSes) . . . . . . . . . . . . .   9
     5.3.  Link-local address behavior . . . . . . . . . . . . . . .  10
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