IDR S. Hares Internet-Draft Huawei Updates: 4271 (if approved) March 13, 2017 Intended status: Standards Track Expires: September 14, 2017 Decprecate Atomic Aggregate draft-hares-deprecate-atomic-aggregate-00.txt Abstract This document deprecates the support for the BGP well-know discretionary attribute ATOMIC_AGGREGATE specified in RFC4271. It proposes the changes to RFC4271 to remove its support. Requirements Language 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]. 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 working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any 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 September 14, 2017. 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 (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents Hares Expires September 14, 2017 [Page 1] Internet-Draft Deprecate Atomic Aggregate March 2017 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. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Changes to Section 4.3 . . . . . . . . . . . . . . . . . . . 2 3. Changes to Section 5 - Path Attributes . . . . . . . . . . . 3 4. Changes to Section 9 . . . . . . . . . . . . . . . . . . . . 3 4.1. Changes to section 9.1.4 . . . . . . . . . . . . . . . . 3 4.2. Section 9.2 Changes . . . . . . . . . . . . . . . . . . . 4 5. Operational Considerations . . . . . . . . . . . . . . . . . 4 6. Error Handling . . . . . . . . . . . . . . . . . . . . . . . 4 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 4 8. Security Considerations . . . . . . . . . . . . . . . . . . . 4 9. Normative References . . . . . . . . . . . . . . . . . . . . 5 Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 5 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction The ATOMIC_AGGREGATE well-known discretionary attribute is specified in [RFC4271] in section 5.1.6. This document specifies the changes to RFC4271 in order to remove the ATOMIC_AGGREGATE attribute. 2. Changes to Section 4.3 delete the following text: Hares Expires September 14, 2017 [Page 2] Internet-Draft Deprecate Atomic Aggregate March 2017 f) ATOMIC_AGGREGATE (Type Code 6) ATOMIC_AGGREGATE is a well-known discretionary attribute of length 0. Usage of this attribute is defined in 5.1.6. 3. Changes to Section 5 - Path Attributes 1: Section 5.0 should have the following changes (p. 24) Old: attribute EBGP IBGP ORIGIN mandatory mandatory AS_PATH mandatory mandatory NEXT_HOP mandatory mandatory MULTI_EXIT_DISC discretionary discretionary LOCAL_PREF see Section 5.1.5 required ATOMIC_AGGREGATE see Section 5.1.6 and 9.1.4 AGGREGATOR discretionary discretionary New: attribute EBGP IBGP ORIGIN mandatory mandatory AS_PATH mandatory mandatory NEXT_HOP mandatory mandatory MULTI_EXIT_DISC discretionary discretionary LOCAL_PREF see Section 5.1.5 required AGGREGATOR discretionary discretionary 2: Delete Section 5.1.6 4. Changes to Section 9 4.1. Changes to section 9.1.4 3: Changes to section 9.1.4 Old: If a BGP speaker chooses to aggregate, then it SHOULD either include all ASes used to form the aggregate in an AS_SET, or add the ATOMIC_AGGREGATE attribute to the route. New Hares Expires September 14, 2017 [Page 3] Internet-Draft Deprecate Atomic Aggregate March 2017 If a BGP speaker chooses to aggregate, then it SHOULD either include all ASes used to form the aggregate in an AS_SET. delete the following text: "In particular, a route that carries the ATOMIC_AGGREGATE attribute MUST NOT be de-aggregated." 4.2. Section 9.2 Changes Text to delete: ATOMIC_AGGREGATE: If at least one of the routes to be aggregated has ATOMIC_AGGREGATE path attribute, then the aggregated route SHALL have this attribute as well. 5. Operational Considerations Input needed here. 6. Error Handling An ATOMIC_AGGREGATE attribute received should be silently ignored. 7. IANA Considerations IANA Is asked to deprecate the BGP Attribute: Atomic_Aggregate with this document as reference. 8. Security Considerations Deprecating a BGP attribute does not change the BGP messages sent on over a secure transport. Users of this mechanism should be aware that unless a transport that provides integrity (such as TCP-AO [RFC5925]) is used for the BGP session in question, BGP Attributes can be forged. This could become an attack vector. Unless a transport that provides confidentiality (such as IPSec [RFC4303]) is used, BGP attributes Communication messages could be snooped by an attacker allowing access to BGP attributes. These issues are common to any BGP message but may be of greater interest in the context of this proposal since a BGP Attribute is being deleted. Hares Expires September 14, 2017 [Page 4] Internet-Draft Deprecate Atomic Aggregate March 2017 9. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A Border Gateway Protocol 4 (BGP-4)", RFC 4271, DOI 10.17487/RFC4271, January 2006, . [RFC4303] Kent, S., "IP Encapsulating Security Payload (ESP)", RFC 4303, DOI 10.17487/RFC4303, December 2005, . [RFC5925] Touch, J., Mankin, A., and R. Bonica, "The TCP Authentication Option", RFC 5925, DOI 10.17487/RFC5925, June 2010, . Appendix A. Acknowledgements The author would like to gratefully acknowledge the IDR WG discussion Author's Address Susan Hares Huawei 7453 Hickory Hill Saline, MI 48176 USA Email: shares@ndzh.com Hares Expires September 14, 2017 [Page 5]