Asymmetric Extended Route Optimization (AERO)
RFC 6706

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Internet Engineering Task Force (IETF)                   F. Templin, Ed.
Request for Comments: 6706                  Boeing Research & Technology
Category: Experimental                                       August 2012
ISSN: 2070-1721

             Asymmetric Extended Route Optimization (AERO)

Abstract

   Nodes attached to common multi-access link types (e.g., multicast-
   capable, shared media, non-broadcast multiple access (NBMA), etc.)
   can exchange packets as neighbors on the link, but they may not
   always be provisioned with sufficient routing information for optimal
   neighbor selection.  Such nodes should therefore be able to discover
   a trusted intermediate router on the link that provides both
   forwarding services to reach off-link destinations and redirection
   services to inform the node of an on-link neighbor that is closer to
   the final destination.  This redirection can provide a useful route
   optimization, since the triangular path from the ingress link
   neighbor, to the intermediate router, and finally to the egress link
   neighbor may be considerably longer than the direct path from ingress
   to egress.  However, ordinary redirection may lead to operational
   issues on certain link types and/or in certain deployment scenarios.
   This document therefore introduces an Asymmetric Extended Route
   Optimization (AERO) capability that addresses the issues.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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.

   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/rfc6706.

Templin                       Experimental                      [Page 1]
RFC 6706                          AERO                       August 2012

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.

Templin                       Experimental                      [Page 2]
RFC 6706                          AERO                       August 2012

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................6
   3. Motivation ......................................................7
   4. Example Use Cases ...............................................8
   5. Requirements ....................................................9
   6. Asymmetric Extended Route Optimization (AERO) ..................10
      6.1. AERO Link Dynamic Routing .................................10
      6.2. AERO Node Behavior ........................................11
           6.2.1. AERO Node Types ....................................11
           6.2.2. AERO Host Behavior .................................11
           6.2.3. Edge AERO Router Behavior ..........................11
           6.2.4. Intermediate AERO Router Behavior ..................12
      6.3. AERO Reference Operational Scenario .......................12
      6.4. AERO Specification ........................................14
           6.4.1. Traditional Redirection Approaches .................14
           6.4.2. AERO Concept of Operations .........................15
           6.4.3. Conceptual Data Structures and Protocol Constants ..16
           6.4.4. Data Origin Authentication .........................17
           6.4.5. AERO Redirection Message Format ....................18
           6.4.6. Sending Predirects .................................20
           6.4.7. Processing Predirects and Sending Redirects ........21
           6.4.8. Forwarding Redirects ...............................22
           6.4.9. Processing Redirects ...............................23
           6.4.10. Sending Periodic Predirect Keepalives .............24