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Network Working Group Request for Comments: 2172 Category: Informational

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

References [1] Murakami, K. and M. Maruyama, "MAPOS - Multiple Access Protocol over SONET/SDH, Version 1," RFC-2171, June 1997. CCITT Recommendation G.707: Synchronous Digital Hierarchy Bit Rates (1990). CCITT Recommendation G.708: Network Node Interface for Synchronous Digital Hierarchy (1990). CCITT Recommendation G.709: Synchronous Multiplexing Structure (1990). American National Standard for Telecommunications - Digital Hierarchy - Optical Interface Rates and Formats Specification, ANSI T1.105-1991. Simpson, W., editor, "PPP in HDLC-like Framing," RFC-1662, July 1994. Postel, J., "Internet Protocol (IP)," RFC-791, September 1981. Murakami, K. and M. Maruyama, "IPv4 over MAPOS Version 1," RFC-2176, June, 1997.

[2]

[3]

[4]

[5]

[6]

[7] [8]

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[9]

Murakami, K. and M. Maruyama, "A MAPOS version 1 Extension Node Switch Protocol," RFC-2173, June, 1997. Murakami, K. and M. Maruyama, "A MAPOS version 1 Extension Switch Switch Protocol," RFC-2174, June, 1997.

[10]

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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