Design Discussion of Route Leaks Solution Methods
draft-sriram-idr-route-leak-solution-discussion-04

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IDR Working Group                                         K. Sriram, Ed.
Internet-Draft                                                  USA NIST
Intended status: Informational                         September 9, 2020
Expires: March 13, 2021

           Design Discussion of Route Leaks Solution Methods
           draft-sriram-idr-route-leak-solution-discussion-04

Abstract

   This document captures the design rationale of the route leaks
   solution document (see draft-ietf-idr-route-leak-detection-
   mitigation, draft-ietf-grow-route-leak-detection-mitigation).  The
   designers needed to balance many competing factors, and this document
   provides insights into the design questions and their resolution.

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Sriram                   Expires March 13, 2021                 [Page 1]
Internet-Draft       Route Leak Solution Discussion       September 2020

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Related Prior Work  . . . . . . . . . . . . . . . . . . . . .   2
   3.  Design Rationale and Discussion . . . . . . . . . . . . . . .   3
     3.1.  Explanation of Rules 1 and 2 in the solution document . .   3
     3.2.  Is route-leak solution without cryptographic protection
           an attack vector? . . . . . . . . . . . . . . . . . . . .   5
     3.3.  Combining results of route-leak detection, OV and BGPsec
           validation for path selection decision  . . . . . . . . .   6
     3.4.  Are there cases when valley-free violations can be
           considered legitimate?  . . . . . . . . . . . . . . . . .   6
     3.5.  Comparison with other methods (routing security BCPs) . .   7
     3.6.  Per-Hop RLP Field or Single RLP Flag per Update?  . . . .   8
     3.7.  Prevention of Route Leaks at Local AS: Intra-AS Messaging  10
       3.7.1.  Non-Transitive BGP Community for Intra-AS Messaging .  10
     3.8.  Stopgap Solution when Only Origin Validation is Deployed   11
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  12
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  15
   Contributors  . . . . . . . . . . . . . . . . . . . . . . . . . .  15
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   This document captures the design rationale of the route leaks
   solution document [I-D.ietf-idr-route-leak-detection-mitigation]
   [I-D.ietf-grow-route-leak-detection-mitigation].  The designers
   needed to balance many competing factors, and this document provides
   insights into the design questions and their resolution.

2.  Related Prior Work

   The solution described in
   [I-D.ietf-idr-route-leak-detection-mitigation] is based on setting an
   attribute in BGP route announcement to manage the transmission/
   receipt of the announcement based on the type of neighbor (e.g.,
   customer, transit provider, etc.).  Documented prior work related to
   this basic idea and mechanism dates back to at least the 1980's.
   Some examples of prior work are: (1) Information flow rules described
   in [proceedings-sixth-ietf] (see pp. 195-196); (2) Link Type
   described in [RFC1105-obsolete] (see pp. 4-5); (3) Hierarchical
   Recording described in [draft-kunzinger-idrp-ISO10747-01] (see
   Section 6.3.1.12).  The problem of route leaks and possible solution