BGP Operations and Security
RFC 7454
Document | Type |
RFC - Best Current Practice
(February 2015; No errata)
Also known as BCP 194
|
|
---|---|---|---|
Authors | Jerome Durand , Ivan Pepelnjak , Gert Doering | ||
Last updated | 2018-12-20 | ||
Replaces | draft-jdurand-bgp-security | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Gunter Van de Velde | ||
Shepherd write-up | Show (last changed 2014-08-20) | ||
IESG | IESG state | RFC 7454 (Best Current Practice) | |
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Joel Jaeggli | ||
Send notices to | (None) | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | No IANA Actions |
Internet Engineering Task Force (IETF) J. Durand Request for Comments: 7454 Cisco Systems, Inc. BCP: 194 I. Pepelnjak Category: Best Current Practice NIL ISSN: 2070-1721 G. Doering SpaceNet February 2015 BGP Operations and Security Abstract The Border Gateway Protocol (BGP) is the protocol almost exclusively used in the Internet to exchange routing information between network domains. Due to this central nature, it is important to understand the security measures that can and should be deployed to prevent accidental or intentional routing disturbances. This document describes measures to protect the BGP sessions itself such as Time to Live (TTL), the TCP Authentication Option (TCP-AO), and control-plane filtering. It also describes measures to better control the flow of routing information, using prefix filtering and automation of prefix filters, max-prefix filtering, Autonomous System (AS) path filtering, route flap dampening, and BGP community scrubbing. 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 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 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 http://www.rfc-editor.org/info/rfc7454. Durand, et al. Best Current Practice [Page 1] RFC 7454 BGP OPSEC February 2015 Copyright Notice Copyright (c) 2015 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 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. Durand, et al. Best Current Practice [Page 2] RFC 7454 BGP OPSEC February 2015 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4 2. Scope of the Document . . . . . . . . . . . . . . . . . . . . 4 3. Definitions and Acronyms . . . . . . . . . . . . . . . . . . 4 4. Protection of the BGP Speaker . . . . . . . . . . . . . . . . 5 5. Protection of BGP Sessions . . . . . . . . . . . . . . . . . 6 5.1. Protection of TCP Sessions Used by BGP . . . . . . . . . 6 5.2. BGP TTL Security (GTSM) . . . . . . . . . . . . . . . . . 6 6. Prefix Filtering . . . . . . . . . . . . . . . . . . . . . . 7 6.1. Definition of Prefix Filters . . . . . . . . . . . . . . 7 6.1.1. Special-Purpose Prefixes . . . . . . . . . . . . . . 7 6.1.2. Unallocated Prefixes . . . . . . . . . . . . . . . . 8 6.1.3. Prefixes That Are Too Specific . . . . . . . . . . . 12 6.1.4. Filtering Prefixes Belonging to the Local AS and Downstreams . . . . . . . . . . . . . . . . . . . . . 12 6.1.5. IXP LAN Prefixes . . . . . . . . . . . . . . . . . . 12 6.1.6. The Default Route . . . . . . . . . . . . . . . . . . 13 6.2. Prefix Filtering Recommendations in Full Routing Networks 14 6.2.1. Filters with Internet Peers . . . . . . . . . . . . . 14 6.2.2. Filters with Customers . . . . . . . . . . . . . . . 16 6.2.3. Filters with Upstream Providers . . . . . . . . . . . 16 6.3. Prefix Filtering Recommendations for Leaf Networks . . . 17 6.3.1. Inbound Filtering . . . . . . . . . . . . . . . . . . 17 6.3.2. Outbound Filtering . . . . . . . . . . . . . . . . . 17 7. BGP Route Flap Dampening . . . . . . . . . . . . . . . . . . 17 8. Maximum Prefixes on a Peering . . . . . . . . . . . . . . . . 18 9. AS Path Filtering . . . . . . . . . . . . . . . . . . . . . . 18 10. Next-Hop Filtering . . . . . . . . . . . . . . . . . . . . . 20Show full document text