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Reservation of Last Autonomous System (AS) Numbers (RFC7300) Disclosure Number: IPCOM000237731D
Original Publication Date: 2014-Jul-01
Included in the Prior Art Database: 2014-Jul-08
Document File: 10 page(s) / 8K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Haas: AUTHOR [+2]


2. Requirements Language

This text was extracted from an ASCII text file.
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Internet Engineering Task Force (IETF)                           J. Haas Request for Comments: 7300                              Juniper Networks BCP: 6                                                       J. Mitchell Updates: 1930                                      Microsoft Corporation Category: Best Current Practice                                July 2014 ISSN: 2070-1721

            Reservation of Last Autonomous System (AS) Numbers


   This document reserves two Autonomous System Numbers (ASNs) at the    end of the 16-bit and 32-bit ranges, described in this document as    "Last ASNs", and provides guidance to implementers and operators on    their use.  This document updates Section 10 of RFC 1930.

Status of This Memo

   This memo documents an Internet Best Current Practice.

   This document is a product of the Internet Engineering Task Force    (IETF).  It has been approved for publication by the Internet    Engineering Steering Group (IESG).  Further information on BCPs is    available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

Copyright Notice

   Copyright (c) 2014 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    Provisions Relating to IETF Documents    ( in effect on the date of    publication of this document.  Please review these documents    carefully, as they describe your rights and restrictions with respect    to this document.  Code Components extracted from this document must    include Simplified BSD License text as described in Section 4.e of    the Trust Legal Provisions and are provided without warranty as    described in the Simplified BSD License.

Haas & Mitchell           Best Current Practice                 [Page 1]
 RFC 7300                   Last AS Reservation                 July 2014

 1.  Introduction

   Over a decade ago, IANA reserved the last Autonomous System Number    (ASN) of the 16-bit ASN range, 65535, with the intention that it not    be used by network operators running BGP [RFC4271].  Since the    introduction of "BGP Support for Four-Octet Autonomous System (AS)    Number Space" [RFC6793], IANA has also reserved the last ASN of the    32-bit autonomous system number range, 4294967295.  This reservation    has been documented in the IANA "Autonomous System (AS) Numbers"    registry [IANA.AS].  Although these "Last ASNs" border on Private Use    ASN [RFC6996...