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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: mitsuru@ntt-20.ecl.net

Ken Murakami
NTT Software Laboratories
3-9-11, Midori-cho
Musashino-shi
Tokyo-180, Japan
E-mail: murakami@ntt-20.ecl.net
























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