Asymmetric Extended Route Optimization (AERO)
draft-templin-aero-09

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Network Working Group                                    F. Templin, Ed.
Internet-Draft                              Boeing Research & Technology
Intended status: Informational                         February 28, 2012
Expires: August 31, 2012

             Asymmetric Extended Route Optimization (AERO)
                       draft-templin-aero-09.txt

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 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 Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on August 31, 2012.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the

Templin                  Expires August 31, 2012                [Page 1]
Internet-Draft                    AERO                     February 2012

   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Requirements . . . . . . . . . . . . . . . . . . . . . . . . .  6
   4.  Asymmetric Extended Route Optimization (AERO)  . . . . . . . .  7
     4.1.  AERO Link Dynamic Routing  . . . . . . . . . . . . . . . .  7
     4.2.  AERO Node Behavior . . . . . . . . . . . . . . . . . . . .  7
       4.2.1.  AERO Node Types  . . . . . . . . . . . . . . . . . . .  7
       4.2.2.  AERO Host Behavior . . . . . . . . . . . . . . . . . .  7
       4.2.3.  Edge AERO Router Behavior  . . . . . . . . . . . . . .  8
       4.2.4.  Intermediate AERO Router Behavior  . . . . . . . . . .  8
     4.3.  AERO Reference Operational Scenario  . . . . . . . . . . .  9
     4.4.  AERO Specification . . . . . . . . . . . . . . . . . . . . 11
       4.4.1.  Classical Redirection Approaches . . . . . . . . . . . 11
       4.4.2.  AERO Concept of Operations . . . . . . . . . . . . . . 12
       4.4.3.  Conceptual Data Structures and Protocol Constants  . . 13
       4.4.4.  Data Origin Authentication . . . . . . . . . . . . . . 13
       4.4.5.  Sending Predirects . . . . . . . . . . . . . . . . . . 14
       4.4.6.  Processing Predirects and Sending Redirects  . . . . . 16
       4.4.7.  Relaying Redirects . . . . . . . . . . . . . . . . . . 18
       4.4.8.  Processing Redirects . . . . . . . . . . . . . . . . . 18
       4.4.9.  Sending Periodic Predirect Keepalives  . . . . . . . . 19
       4.4.10. Reachability Considerations  . . . . . . . . . . . . . 21
       4.4.11. Mobility Considerations  . . . . . . . . . . . . . . . 21
       4.4.12. Prefix Re-Provisioning Considerations  . . . . . . . . 23
       4.4.13. Backward Compatibility . . . . . . . . . . . . . . . . 23
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 23
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 23