BGPsec Considerations for Autonomous System (AS) Migration
RFC 8206

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Internet Engineering Task Force (IETF)                         W. George
Request for Comments: 8206                                       Neustar
Updates: 8205                                                  S. Murphy
Category: Standards Track                                  PARSONS, Inc.
ISSN: 2070-1721                                           September 2017

       BGPsec Considerations for Autonomous System (AS) Migration

Abstract

   This document discusses considerations and methods for supporting and
   securing a common method for Autonomous System (AS) migration within
   the BGPsec protocol.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8206.

Copyright Notice

   Copyright (c) 2017 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
   (https://trustee.ietf.org/license-info) 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.

George & Murphy              Standards Track                    [Page 1]
RFC 8206                   BGPsec AS Migration            September 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
     1.2.  Documentation Note  . . . . . . . . . . . . . . . . . . .   3
   2.  General Scenario  . . . . . . . . . . . . . . . . . . . . . .   3
   3.  RPKI Considerations . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Origin Validation . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Path Validation . . . . . . . . . . . . . . . . . . . . .   5
       3.2.1.  Outbound Announcements (PE-->CE)  . . . . . . . . . .   5
       3.2.2.  Inbound Announcements (CE-->PE) . . . . . . . . . . .   6
   4.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Solution  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Outbound (PE-->CE)  . . . . . . . . . . . . . . . . . . .   8
     5.2.  Inbound (CE-->PE) . . . . . . . . . . . . . . . . . . . .   8
     5.3.  Other Considerations  . . . . . . . . . . . . . . . . . .   9
     5.4.  Example . . . . . . . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   A method of managing a BGP Autonomous System Number (ASN) migration
   is described in RFC 7705 [RFC7705].  Since it concerns the handling
   of AS_PATH attributes, it is necessary to ensure that the process and
   features are properly supported in BGPsec [RFC8205] because BGPsec is
   explicitly designed to protect against changes in the BGP AS_PATH,
   whether by choice, by misconfiguration, or by malicious intent.  It
   is critical that the BGPsec protocol framework be able to support
   this operationally necessary tool without creating an unacceptable
   security risk or exploit in the process.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

George & Murphy              Standards Track                    [Page 2]
RFC 8206                   BGPsec AS Migration            September 2017

1.2.  Documentation Note

   This document uses ASNs from the range reserved for documentation as
   described in RFC 5398 [RFC5398].  In the examples used here, they are
   intended to represent Globally Unique ASNs, not ASNs reserved for