Global Routing Operations J. Mauch Internet-Draft Akamai Intended status: Standards Track J. Snijders Expires: October 12, 2017 NTT G. Hankins Nokia April 10, 2017 Default EBGP Route Propagation Behavior Without Policies draft-ietf-grow-bgp-reject-05 Abstract This document defines the default behavior of a BGP speaker when there is no import or export policy associated with an External BGP session. 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 RFC 2119 [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 October 12, 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 Mauch, et al. Expires October 12, 2017 [Page 1] Internet-Draft BGP Default Reject April 2017 (http://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. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Solution . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 3 4. Security Considerations . . . . . . . . . . . . . . . . . . . 3 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 6. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 3 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 7.1. Normative References . . . . . . . . . . . . . . . . . . 4 7.2. Informative References . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction There are BGP routing security issues that need to be addressed to make the Internet more stable. Route leaks [RFC7908] are part of the problem, but software defects or operator misconfigurations can contribute too. This document provides guidance to BGP [RFC4271] implementers to improve the default level of Internet routing security. Many deployed BGP speakers send and accept any and all route announcements between their BGP neighbors by default. This practice dates back to the early days of the Internet, where operators were permissive in sending routing information to allow all networks to reach each other. As the Internet has become more densely interconnected, the risk of a misbehaving BGP speaker poses significant risks to Internet routing. This specification intends to improve this situation by requiring the explicit configuration of a BGP import and export policy for any External BGP (EBGP) session such as customers, peers, or confederation boundaries for all enabled address families. When this solution is implemented, BGP speakers do not accept or send routes without policies configured on EBGP sessions. Mauch, et al. Expires October 12, 2017 [Page 2] Internet-Draft BGP Default Reject April 2017 2. Solution The following requirements apply to all BGP speakers: o A BGP speaker MUST consider any routes advertised by an EBGP peer ineligible for route selection (section 9.1.1 [RFC4271]), if no import policy was configured for the peer. o A BGP speaker MUST NOT advertise any routes to an EBGP peer, if no export policy was configured for the peer. o A BGP speaker SHOULD fall back to an "import nothing" and "export nothing" mode following failure of internal components, such as a policy engine. o A BGP speaker MAY provide a configuration option to disable the preceding behaviors, but it MUST implement them by default. 3. Acknowledgments The authors would like to thank the following people for their comments, support and review: Shane Amante, Christopher Morrow, Robert Raszuk, Greg Skinner, Adam Chappell, Sriram Kotikalapudi, Brian Dickson, Jeffrey Haas, John Heasley, Ignas Bagdonas, Donald Smith, and Dale Worley. 4. Security Considerations This document addresses a basic routing security issue caused by permissive default routing policy configurations. Operators need implementers to address this problem with more secure defaults to mitigate collateral damage on Internet routing. Inadvertent or adversarial advertisements cause business impact that can be mitigated by a secure default behavior. 5. IANA Considerations This document has no actions for IANA. 6. Contributors The following people contributed to successful deployment of solution described in this document: Jakob Heitz Cisco Email: jheitz@cisco.com Mauch, et al. Expires October 12, 2017 [Page 3] Internet-Draft BGP Default Reject April 2017 Ondrej Filip CZ.NIC Email: ondrej.filip@nic.cz 7. References 7.1. 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, . 7.2. Informative References [RFC7908] Sriram, K., Montgomery, D., McPherson, D., Osterweil, E., and B. Dickson, "Problem Definition and Classification of BGP Route Leaks", RFC 7908, DOI 10.17487/RFC7908, June 2016, . Authors' Addresses Jared Mauch Akamai Technologies 8285 Reese Lane Ann Arbor Michigan 48103 US Email: jared@akamai.com Job Snijders NTT Communications Theodorus Majofskistraat 100 Amsterdam 1065 SZ NL Email: job@ntt.net Mauch, et al. Expires October 12, 2017 [Page 4] Internet-Draft BGP Default Reject April 2017 Greg Hankins Nokia 777 E. Middlefield Road Mountain View, CA 94043 USA Email: greg.hankins@nokia.com Mauch, et al. Expires October 12, 2017 [Page 5]