SAVI for Mixed Address Assignment Methods Scenario
draft-ietf-savi-mix-09

Document Type Active Internet-Draft (savi WG)
Last updated 2015-07-19
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SAVI                                                               J. Bi
Internet-Draft                                            Tsinghua Univ.
Intended status: Standards Track                                  G. Yao
Expires: January 20, 2016                                          Baidu
                                                              J. Halpern
                                                               Newbridge
                                                   E. Levy-Abegnoli, Ed.
                                                                   Cisco
                                                           July 19, 2015

           SAVI for Mixed Address Assignment Methods Scenario
                         draft-ietf-savi-mix-09

Abstract

   In case that multiple IP address assignment methods are allowed in a
   network, the corresponding SAVI methods should be enabled to prevent
   spoofing in the network.  This document reviews how multiple SAVI
   methods can coexist in a single SAVI device and collisions are
   resolved when the same binding entry is discovered by two or more
   methods.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on January 20, 2016.

Copyright Notice

   Copyright (c) 2015 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

Bi, et al.              Expires January 20, 2016                [Page 1]
Internet-Draft                  SAVI MIX                       July 2015

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Problem Scope . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Architecture  . . . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Recommendations for preventing collisions . . . . . . . . . .   5
   6.  Resolving binding collisions  . . . . . . . . . . . . . . . .   5
     6.1.  Same Address on Different Binding Anchors . . . . . . . .   5
       6.1.1.  Basic preference  . . . . . . . . . . . . . . . . . .   6
       6.1.2.  Overwritten preference  . . . . . . . . . . . . . . .   6
       6.1.3.  Multiple SAVI Device Scenario . . . . . . . . . . . .   7
     6.2.  Same Address on the Same Binding Anchor . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   9.  Acknowledgment  . . . . . . . . . . . . . . . . . . . . . . .   8
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     10.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   There are currently several SAVI documents ([RFC6620], [RFC7513] and
   [RFC7219]) that describe the different methods by which a switch can
   discover and record bindings between a node's IP address and a
   binding anchor and use that binding to perform source address
   validation.  Each of these documents specifies how to learn on-link
   addresses, based on the method used for their assignment,
   respectively: StateLess Autoconfiguration (SLAAC), Dynamic Host
   Control Protocol (DHCP) and Secure Neighbor Discovery (SeND).  Each
   of these documents describes separately how one particular method
   deals with address collisions (same address, different binding
   anchor).

   While multiple IP assignment methods can be used in the same layer-2
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