BGPsec Design Choices and Summary of Supporting Discussions
RFC 8374

Document Type RFC - Informational (April 2018; No errata)
Last updated 2018-04-25
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Independent Submission                                    K. Sriram, Ed.
Request for Comments: 8374                                      USA NIST
Category: Informational                                       April 2018
ISSN: 2070-1721

      BGPsec Design Choices and Summary of Supporting Discussions

Abstract

   This document captures the design rationale of the initial draft
   version of what became RFC 8205 (the BGPsec protocol specification).
   The designers needed to balance many competing factors, and this
   document lists the decisions that were made in favor of or against
   each design choice.  This document also presents brief summaries of
   the arguments that aided the decision process.  Where appropriate,
   this document also provides brief notes on design decisions that
   changed as the specification was reviewed and updated by the IETF
   SIDR Working Group and that resulted in RFC 8205.  These notes
   highlight the differences and provide pointers to details and
   rationale regarding those design changes.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This is a contribution to the RFC Series, independently of any other
   RFC stream.  The RFC Editor has chosen to publish this document at
   its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not candidates for any level of Internet Standard;
   see 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/rfc8374.

Sriram                        Informational                     [Page 1]
RFC 8374                  BGPsec Design Choices               April 2018

Copyright Notice

   Copyright (c) 2018 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.

Table of Contents

   1. Introduction ....................................................4
   2. Creating Signatures and the Structure of BGPsec Update
      Messages ........................................................5
      2.1. Origin Validation Using ROAs ...............................5
      2.2. Attributes Signed by an Originating AS .....................6
      2.3. Attributes Signed by an Upstream AS ........................7
      2.4. Attributes That Are Not Signed .............................8
      2.5. Receiving Router Actions ...................................9
      2.6. Prepending of ASes in AS Path .............................10
      2.7. RPKI Data That Needs to Be Included in Updates ............10
   3. Withdrawal Protection ..........................................11
      3.1. Withdrawals Not Signed ....................................11
      3.2. Signature Expire Time for Withdrawal Protection
           (a.k.a. Mitigation of Replay Attacks) .....................12
      3.3. Should Route Expire Time be Communicated in a
           Separate Message? .........................................13
      3.4. Effect of Expire Time Updates in BGPsec on RFD ............14
   4. Signature Algorithms and Router Keys ...........................16
      4.1. Signature Algorithms ......................................16
      4.2. Agility of Signature Algorithms ...........................17
      4.3. Sequential Aggregate Signatures ...........................18
      4.4. Protocol Extensibility ....................................19
      4.5. Key per Router (Rogue Router Problem) .....................20
      4.6. Router ID .................................................20
   5. Optimizations and Resource Sizing ..............................21
      5.1. Update Packing and Repacking ..............................21
      5.2. Signature per Prefix vs. Signature per Update .............22
      5.3. Maximum BGPsec Update PDU Size ............................22
      5.4. Temporary Suspension of Attestations and Validations ......23

Sriram                        Informational                     [Page 2]
RFC 8374                  BGPsec Design Choices               April 2018

   6. Incremental Deployment and Negotiation of BGPsec ...............24
      6.1. Downgrade Attacks .........................................24
      6.2. Inclusion of Address Family in Capability Advertisement ...24
      6.3. Incremental Deployment: Capability Negotiation ............25
      6.4. Partial Path Signing ......................................25
      6.5. Consideration of Stub ASes with Resource
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