The "import-via" and "export-via" attributes in RPSL Policy Specifications
draft-snijders-rpsl-via-01

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Network Working Group                                        J. Snijders
Internet-Draft                                        Atrato IP Networks
Intended status: Informational                            August 7, 2013
Expires: February 8, 2014

      The "import-via" and "export-via" attributes in RPSL Policy
                             Specifications
                       draft-snijders-rpsl-via-01

Abstract

   This document defines two attributes in the aut-num Class which can
   be used in RPSL policy specifications to publish desired routing
   policy regarding non-adjacent networks.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . . . 3
   3.  Background  . . . . . . . . . . . . . . . . . . . . . . . . . . 3
   4.  Import and Export Via Syntax and Semantics  . . . . . . . . . . 4
   5.  Example Usage . . . . . . . . . . . . . . . . . . . . . . . . . 5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . . . 6
     9.2.  Informative References  . . . . . . . . . . . . . . . . . . 6
   Appendix A.  Grammar Rules  . . . . . . . . . . . . . . . . . . . . 7
   Appendix B.  Document Change Log  . . . . . . . . . . . . . . . . . 7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 7

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1.  Introduction

   The Routing Policy Specification Language [RFC4012] allows operators
   to specify routing policies regarding directly adjacent networks
   through various import and export attributes.  These attributes only
   apply to directly adjacent networks.

   This document proposes to extend RPSL according to the following
   goals and requirements:

   o  Provide a way to describe what an adjacent network could use as
      routing policy towards its adjacent networks.

   o  The extension should be backward compatible with minimal impact on
      existing tools and processes, following Section 10.2 of [RFC2622].

   The addition of the 'via-import' and 'via-export' attributes in the
   aut-num Class will especially help participants of Multi-Lateral
   Peering services to inform the intermediate autonomous system what
   routing policy should be applied towards other participants.

2.  Notational Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   [RFC2119].

3.  Background

   The via keyword specifically benefits operators whom were assigned a
   32 bit AS Number and transit providers when participating in Multi-
   Lateral Peering Agreements facilitated by a Route Server.

   Often Route Server operators overload BGP Communities [RFC1997]) to
   facilitate signalling of desired routing policy between the
   participants and the Route Server.  Because BGP Communities have a
   length of 32 bit, it is not possible to signal a 32 bit AS Number
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