Classless AS-based Addressing
draft-shi-v6ops-caba-01

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Internet Engineering Task Force                                 Shi, Ed.
Internet-Draft                                                      Yang
Intended status: Informational                                      Wang
Expires: August 28, 2017                                              Wu
                                                                     Yin
                                                          Tsinghua Univ.
                                                       February 24, 2017

                     Classless AS-based Addressing
                        draft-shi-v6ops-caba-01

Abstract

   Addressing is the foundation of routing and it impacts the routing
   scalability.  The IPv6 routing system will face severe scalability
   issue if the IPv6 addresses are recklessly used without careful
   aggregation strategy.  This draft describes an addressing scheme and
   the corresponding allocation scheme which can facilitate the
   aggregation of IPv6 addresses and keep the IPv6 inter-domain routing
   system from being overloaded.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on August 28, 2017.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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   This document is subject to BCP 78 and the IETF Trust's Legal
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   publication of this document.  Please review these documents

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   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Address format  . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  ASN allocation  . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  effects on the size of IPv6 inter-domain routing tables . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  Conclusions . . . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   IP address fragment is one of the most contributing factors that
   cause scalability problems to the IPv4 inter-domain routing system.
   The IPv6 routing system will face severe scalability issue if the
   IPv6 addresses are recklessly used without careful aggregation
   strategy.  This document propose Classless AS-Based Addressing (CABA)
   scheme, which embeds 32 bits AS number (ASN) into the IPv6 address.
   If ASNs are properly allocated, CABA can facilitate aggregation of IP
   addresses and reduce the size of inter-domain routing tables.

2.  Address format

   The Classless AS-Based address has five fields of fixed lengths, as
   shown in Figure 1.

+---------+-------------+--------------+------------+--------/ /--------+
| IANA /8 | ASN Low /16 | ASN High /16 | Subnet /24 |   Interface /64   |
+---------+-------------+--------------+------------+--------/ /--------+

                Figure 1: Classless AS-Based address format

   IANA /8 field should be allocated by IANA.

   ASN Low /16 is the lower 16 bits of the AS number.

   ASN High /16 is the higher 16 bits of the AS number.

   Subnet /24 should be allocated by individual ASes according to their
   intra-domain routing policies.

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   Interface /64 is interface ID.
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