IPv6 Point-to-Point Links
draft-palet-v6ops-p2p-links-02

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v6ops                                                  J. Palet Martinez
Internet-Draft                                          The IPv6 Company
Intended status: Informational                              May 29, 2018
Expires: November 30, 2018

                       IPv6 Point-to-Point Links
                     draft-palet-v6ops-p2p-links-02

Abstract

   This document describes different alternatives for configuring IPv6
   point-to-point links, considering the prefix size, numbering choices
   and prefix pool to be used.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Prefix Size Choices . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Rationale for using /64 . . . . . . . . . . . . . . . . .   3
     3.2.  Rationale for using /127  . . . . . . . . . . . . . . . .   4
     3.3.  Rationale for using /126 and Other Options  . . . . . . .   4
     3.4.  A Possible Middle-Term Choice . . . . . . . . . . . . . .   4
   4.  Numbering Choices . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  GUA (Global Unicast Addresses)  . . . . . . . . . . . . .   4
     4.2.  ULA (Unique Local Addresses)  . . . . . . . . . . . . . .   5
     4.3.  Unnumbered  . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Prefix Pool Choices . . . . . . . . . . . . . . . . . . . . .   6
   6.  /64 from Customer Prefix for point-to-point links . . . . . .   6
     6.1.  Numbering Interfaces  . . . . . . . . . . . . . . . . . .   6
     6.2.  Routing Aggregation of the Point-to-Point Links . . . . .   7
     6.3.  DHCPv6 Considerations . . . . . . . . . . . . . . . . . .   8
     6.4.  Router Considerations . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     10.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   There are different alternatives for numbering IPv6 point-to-point
   links, and from an operational perspective, there may have different
   advantages or disadvantages that need to be taken in consideration
   under the scope of each specific network architecture design.

   [RFC6164] describes using /127 prefixes for inter-router point-to-
   point links, using two different address pools, one for numbering the
   point-to-point links and another one for delegating the prefixes at
   the end of the point-to-point link.  However this doesn't exclude
   other choices.

   This document describes alternative approaches, for the prefix size,
   the numbering of the link and the prefix pool.

   The proposed approaches are suitable for those point-to-point links
   connecting ISP to customers, but not limited to those cases, and in
   fact, all them are being used by a relevant number of networks
   worldwide, in several different scenarios (service providers,
   enterprise networks, etc.).

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