RFC 2172

MAPOS Version 1 Assigned Numbers ✨

okay bestie, here's the title block tea 🫶

• RFC: 2172
• Title: MAPOS Version 1 Assigned Numbers
• Stream: Network Working Group
• Authors: M. Maruyama and K. Murakami, NTT Laboratories
• Category: Informational
• Date: June 1997
• Obsoletes/Updates: the original doesn't list any, so there's nothing to report 🙈

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Status of This Memo

okay so this memo is just info for the Internet community 💅 It does not specify an Internet standard of any kind, and distribution is unlimited 🦋

Authors' Note

this doc documents the parameters for MAPOS Version 1 (Multiple Access Protocol over SONET/SDH) 🌸 It is NOT the product of an IETF working group, and it's not a standards track doc. It hasn't necessarily gotten the big community review that standards track docs get, so keep that in mind 🫠

Abstract

this describes the protocol parameters used in MAPOS version 1. MAPOS is a link layer protocol that gives you multiple access over SONET/SDH links ✨

1. Introduction

MAPOS [1] is a high-speed link-layer protocol that gives you multiple access 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] lets multiple nodes hook up in a star topology to make a LAN 🌟 With long haul SONET/SDH links, the nodes on that "SONET-LAN" can cover a huge geographical area. IP [7] datagrams get sent in MAPOS HDLC frames [8] 💖

this doc describes the protocol parameters used in MAPOS version 1 [1] 🎀

2. Protocol Field Assignments

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

here are the assigned MAPOS protocol numbers 🧚

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 thank John P. Mullaney, Clark Bremer, Masayuki Kobayashi, Paul Francis, Toshiaki Yoshida, and Takahiro Sajima for their contributions and thoughtful suggestions 🫶🌈

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