Internet Protocol Version 6 over MAPOS (Multiple Access Protocol Over SONET/SDH)
RFC 3572

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Network Working Group                                           T. Ogura
Request for Comments: 3572                                   M. Maruyama
Category: Informational                      NTT Network Innovation Labs
                                                              T. Yoshida
                                                      Werk Mikro Systems
                                                               July 2003

                Internet Protocol Version 6 over MAPOS
               (Multiple Access Protocol Over SONET/SDH)

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

IESG Note

   This memo documents a way of carrying IPv6 packets over MAPOS
   networks.  This document is NOT the product of an IETF working group
   nor is it a standards track document.  It has not necessarily
   benefited from the widespread and in-depth community review that
   standards track documents receive.

Abstract

   Multiple Access Protocol over SONET/SDH (MAPOS) is a high-speed
   link-layer protocol that provides multiple access capability over a
   Synchronous Optical NETwork/Synchronous Digital Hierarchy
   (SONET/SDH).

   This document specifies the frame format for encapsulating an IPv6
   datagram in a MAPOS frame.  It also specifies the method of forming
   IPv6 interface identifiers, the method of detecting duplicate
   addresses, and the format of the Source/Target Link-layer Addresses
   option field used in IPv6 Neighbor Discovery messages.

Ogura, et. al.               Informational                      [Page 1]
RFC 3572                    IPv6 over MAPOS                    July 2003

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  2
   2.  Frame Format for Encapsulating IPv6 Datagrams. . . . . . . . .  3
       2.1.  Frame Format . . . . . . . . . . . . . . . . . . . . . .  3
       2.2.  Maximum Transmission Unit (MTU). . . . . . . . . . . . .  3
       2.3.  Destination Address Mapping. . . . . . . . . . . . . . .  4
             2.3.1.  Unicast. . . . . . . . . . . . . . . . . . . . .  4
            2.3.2.  Multicast . . . . . . . . . . . . . . . . . . . .  4
   3.  Interface Identifier . . . . . . . . . . . . . . . . . . . . .  6
   4.  Duplicate Address Detection. . . . . . . . . . . . . . . . . .  8
   5.  Source/Target Link-layer Address Option. . . . . . . . . . . .  9
   6.  Security Considerations. . . . . . . . . . . . . . . . . . . . 10
       6.1.  Issues concerning Link-layer Addresses . . . . . . . . . 10
             6.1.1.  Protection against fraudulent reception
                     of traffic . . . . . . . . . . . . . . . . . . . 10
             6.1.2.  Protection against improper traffic. . . . . . . 11
       6.2.  Uniqueness of Interface Identifiers. . . . . . . . . . . 11
   7.  References. . . .  . . . . . . . . . . . . . . . . . . . . . . 12
   8.  Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 13
   9.  Full Copyright Statement . . . . . . . . . . . . . . . . . . . 14

1.  Introduction

   Multiple Access Protocol over SONET/SDH (MAPOS) [1][2] is a high-
   speed link-layer protocol that provides multiple access capability
   over SONET/SDH.  Its frame format is based on the HDLC-like (High
   Level Data Link Control) framing [3] for PPP.  A component called a
   "Frame Switch" [1] allows multiple nodes (hosts and routers) to be
   connected together in a star topology to form a LAN.  Using long-haul
   SONET/SDH links, the nodes on such a "SONET-LAN" can span a wide
   geographical area.

   This document specifies the frame format for encapsulating an
   Internet Protocol version 6 (IPv6) [4] datagram in a MAPOS frame, the
   method of forming IPv6 interface identifiers, the method of detecting
   duplicate addresses, and the format of the Source/Target Link-layer
   Addresses option field used in Neighbor Discovery messages such as
   Router Solicitation, Router Advertisement, Neighbor Solicitation,
   Neighbor Advertisement, and Redirect messages.

   In the remainder of this document, the term "MAPOS" is used unless
   the distinction between MAPOS version 1 [1] and MAPOS 16 [2] is
   required.

Ogura, et. al.               Informational                      [Page 2]
RFC 3572                    IPv6 over MAPOS                    July 2003

2.  Frame Format for Encapsulating IPv6 Datagrams

2.1.  Frame Format

   MAPOS uses the same HDLC-like framing as PPP-over-SONET, described in
   [3].  The MAPOS frame begins and ends with a flag sequence 01111110
   (0x7E), and the MAPOS frame header contains address, control, and
   protocol fields.  The address field contains a destination HDLC
   address.  In MAPOS 16, the address field is extended to 16 bits, and