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Simple Virtual Aggregation (S-VA)
RFC 6769

Internet Engineering Task Force (IETF)                         R. Raszuk
Request for Comments: 6769                                       NTT MCL
Category: Informational                                         J. Heitz
ISSN: 2070-1721                                                 Ericsson
                                                                   A. Lo
                                                                  Arista
                                                                L. Zhang
                                                                    UCLA
                                                                   X. Xu
                                                                  Huawei
                                                            October 2012

                   Simple Virtual Aggregation (S-VA)

Abstract

   All BGP routers in the Default-Free Zone (DFZ) are required to carry
   all routes in the Default-Free Routing Table (DFRT).  This document
   describes a technique, Simple Virtual Aggregation (S-VA), that allows
   some BGP routers not to install all of those routes into the
   Forwarding Information Base (FIB).

   Some routers in an Autonomous System (AS) announce an aggregate (the
   VA prefix) in addition to the routes they already announce.  This
   enables other routers not to install the routes covered by the VA
   prefix into the FIB as long as those routes have the same next-hop as
   the VA prefix.

   The VA prefixes that are announced within an AS are not announced to
   any other AS.  The described functionality is of very low operational
   complexity, as it proposes a confined BGP speaker solution without
   any dependency on network-wide configuration or requirement for any
   form of intra-domain tunneling.

Status of This Memo

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

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

Raszuk, et al.                Informational                     [Page 1]
RFC 6769                          S-VA                      October 2012

   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/rfc6769.

Copyright Notice

   Copyright (c) 2012 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.

Table of Contents

   1. Introduction ....................................................3
      1.1. Scope of This Document .....................................3
      1.2. Requirements Notation ......................................3
      1.3. Terminology ................................................3
   2. Operation of S-VA ...............................................4
   3. Deployment Considerations .......................................6
   4. Security Considerations .........................................7
   5. Acknowledgements ................................................7
   6. Normative References ............................................7
   7. Informative References ..........................................7

Raszuk, et al.                Informational                     [Page 2]
RFC 6769                          S-VA                      October 2012

1.  Introduction

   This document describes a technique called Simple Virtual Aggregation
   (S-VA).  It allows some routers not to store some routes in the
   Forwarding Information Base (FIB) while still advertising and
   receiving the full Default-Free Routing Table (DFRT) in BGP.

   A typical scenario is as follows.  Core routers in the ISP maintain
   the full DFRT in the FIB and Routing Information Base (RIB).  Edge
   routers maintain the full DFRT in the BGP Local RIB (Loc-RIB), but do
   not install certain routes in the RIB and FIB.  Edge routers may

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