RFC2172 - MAPOS Version 1 Assigned Numbers

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].

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.

[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