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Versions: 00 01 draft-ietf-idr-as0

idr                                                            W. Kumari
Internet-Draft                                                    Google
Intended status: Informational                                   R. Bush
Expires: April 25, 2012                        Internet Initiative Japan
                                                             H. Schiller
                                                                 Verizon
                                                        October 23, 2011


                    Codification of AS 0 processing.
                        draft-wkumari-idr-as0-00

Abstract

   This document proscribes the use of AS 0 in BGP OPEN and AS-PATH BGP
   attribute.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on April 25, 2012.

Copyright Notice

   Copyright (c) 2011 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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   (http://trustee.ietf.org/license-info) in effect on the date of
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.



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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
     1.1.  Requirements notation . . . . . . . . . . . . . . . . . . . 3
   2.  Behavior  . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 3
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 4
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 4







































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1.  Introduction

   Autonomous System 0 is listed in the IANA Autonomous System Number
   Registry as "Reserved - May be use to identify non-routed networks"
   ([IANA.AS_Numbers]).

   [I-D.ietf-sidr-iana-objects] specifies that AS number zero in a ROA
   is used to mark an NLRI which is to be marked as Invalid.

   No clear statement that AS 0 was proscribed could be found in any BGP
   specification.

   As at least two implementations discard routes containing AS 0 (and
   to allow approaches such as the above) this document codifies this
   behavior.

1.1.  Requirements notation

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].


2.  Behavior

   This document specifies that a BGP speaker MUST NOT originate or
   propapate an announcement with an AS number of zero, and a BGP
   listener MUST NOT accept an announcement which has an AS number of
   zero in the AS-PATH attribute, and SHOULD log the fact that it has
   done so.

   In addition if a BGP listener recives zero as the peer AS in an OPEN
   message, it MUST abort the connection and send a NOTIFICATION with
   Error Code "OPEN Message Error" and subcode "Bad Peer AS" (see
   [RFC4271] Section 6.2).  Obviosuly enough, a router MUST NOT
   initialte a connection claiming to be AS number zero.


3.  IANA Considerations

   The IANA is requested to update the Reference for number 0 in the
   "Autonomous System (AS) Numbers" registry to refernce this document.


4.  Security Considerations

   By allowing resource holders to say that AS 0 is the only valid
   origin for a route, we allow them to state that a particular address



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   resource is not in use.  By ensuring that all implementations that
   see AS 0 in a route ignore that route, we prevent a malicious party
   from announcing routes containing AS 0 in an attempt to hijack those
   resources.

   In addition, by standardizing the behavior upon reception of an AS
   PATH containing AS 0, this document makes the behavior better
   defined, and security gotchas often lurk in the undefined spaces.


5.  Acknowledgements

   The authors wish to thank the BGPsec design team, and especially
   Randy Bush for providing most of the text.


6.  References

6.1.  Normative References

   [IANA.AS_Numbers]
              IANA, "Autonomous System (AS) Numbers",
              <http://www.iana.org/assignments/as-numbers>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC4271]  Rekhter, Y., Li, T., and S. Hares, "A Border Gateway
              Protocol 4 (BGP-4)", RFC 4271, January 2006.

6.2.  Informative References

   [I-D.ietf-sidr-iana-objects]
              Manderson, T., Vegoda, L., and S. Kent, "RPKI Objects
              issued by IANA", draft-ietf-sidr-iana-objects-03 (work in
              progress), May 2011.


Authors' Addresses

   Warren Kumari
   Google
   1600 Amphitheatre Parkway
   Mountain View, CA  94043
   US

   Email: warren@kumari.net




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   Randy Bush
   Internet Initiative Japan
   5147 Crystal Springs
   Bainbridge Island, WA  98110
   US

   Email: randy@psg.com


   Heather Schiller
   Verizon
   22001 Loudoun County Parkway
   Ashburn  20147
   US

   Email: heather.schiller@verizon.com



































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