Network Working Group                                        M. Maruyama
Request for Comments: 2172                                   K. Murakami
Category: Informational                                 NTT Laboratories
                                                              June 1997


                   MAPOS Version 1 Assigned Numbers


Status of this Memo

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

Authors' Note

  This memo documents the parameters used in the Multiple Access
  Protocol over SONET/SDH Version 1.  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

  This document describes the protocol parameters used in the Multiple
  Access Over SONET/SDH (MAPOS) version 1. MAPOS is a link layer
  protocol and provides multiple access capability over SONET/SDH
  links.

1. Introduction

  Multiple Access Protocol over SONET/SDH (MAPOS) [1] is a high-speed
  link-layer protocol that provides multiple access capability over
  SONET(Synchronous Optical Network)/SDH(Synchronous Digital
  Hierarchy)[2][3][4][5]. Its frame format is based on the HDLC-like
  framing [6] for PPP.  A component called "Frame Switch" [1] allows
  multiple nodes 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 over a wide geographical area. The Internet Protocol (IP)
  [7] datagrams are transmitted in MAPOS HDLC frames [8].

  This document describes the protocol parameters used in MAPOS version
  1 [1].







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2. Protocol Field Assignments

  The MAPOS Version 1 Data Link Layer [1] contains a 16 bit Protocol
  field to identify the the encapsulated protocol.  The Protocol field
  is consistent with the ISO 3309 (HDLC) extension mechanism for
  address fields.  All protocol numbers MUST be assigned such that the
  least significant bit of the most significant octet equals "0", and
  the least significant bit of the least significant octet equals "1".

  Assigned MAPOS Protocol Numbers

     Value (in hex)  Protocol Name

     0001-001F       Not Used - reserved
     0021            MAPOS Version 1 Internet Protocol Version 4 [8]
     0023-FCFF       Not Used - reserved
     FE01            MAPOS Version 1 Address Resolution Protocol (ARP[8])
     FE03            MAPOS Version 1 Node Switch Protocol (NSP[9])
     FE05            MAPOS Version 1 Switch Switch Protocol (SSP[10])
     FE07-FEFF       Not Used - reserved


References

  [1]   Murakami, K. and M. Maruyama, "MAPOS - Multiple Access Protocol
        over SONET/SDH, Version 1," RFC-2171, June 1997.

  [2]   CCITT Recommendation G.707: Synchronous Digital Hierarchy Bit
        Rates (1990).

  [3]   CCITT Recommendation G.708: Network Node Interface for
        Synchronous Digital Hierarchy (1990).

  [4]   CCITT Recommendation G.709: Synchronous Multiplexing Structure
        (1990).

  [5]   American National Standard for Telecommunications - Digital
        Hierarchy - Optical Interface Rates and Formats Specification,
        ANSI T1.105-1991.

  [6]   Simpson, W., editor, "PPP in HDLC-like Framing," RFC-1662,
        July 1994.

  [7]   Postel, J., "Internet Protocol (IP)," RFC-791, September 1981.

  [8]   Murakami, K. and M. Maruyama, "IPv4 over MAPOS Version 1,"
        RFC-2176, June, 1997.




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  [9]   Murakami, K. and M. Maruyama, "A MAPOS version 1 Extension -
        Node Switch Protocol," RFC-2173, June, 1997.

  [10]  Murakami, K. and M. Maruyama, "A MAPOS version 1 Extension -
        Switch Switch Protocol," RFC-2174, June, 1997.

Acknowledgements

  The authors would like to acknowledge the contributions and
  thoughtful suggestions of John P. Mullaney, Clark Bremer, Masayuki
  Kobayashi, Paul Francis, Toshiaki Yoshida, and Takahiro Sajima.

Author's Address

    Mitsuru Maruyama
    NTT Software Laboratories
    3-9-11, Midori-cho
    Musashino-shi
    Tokyo-180, Japan
    E-mail: [email protected]

    Ken Murakami
    NTT Software Laboratories
    3-9-11, Midori-cho
    Musashino-shi
    Tokyo-180, Japan
    E-mail: [email protected]
























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